JP2010283813A - Electronic device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve various problems such as a problem wherein power consumption is increased with increase of capacity and increase of speed of transmission data to cause characteristic degradation due to signal distortion, reliability of a cable and a connector is degraded, whereby cost increase is caused, and a problem wherein restriction of a component arrangement in terms of mounting or the like gets strict. <P>SOLUTION: This electronic device includes a wireless communication means to transmit first category information, and a wired communication means to transmit second category information, wherein pieces of transmission information of the first and second categories are transmitted in parallel to each other by the wireless communication means and the wired communication means. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an information transmission system, an electronic apparatus, and a wireless communication terminal that incorporate elements that require high-speed data transfer, such as display elements and image sensors.

  In recent years, the functions of mobile phones, notebook computers, digital cameras, etc. have been remarkably improved, and the display elements and image sensors incorporated in these devices have been required to have higher resolution and higher definition, which has become increasingly complex. . In particular, mobile phones are required to have built-in camera functions, larger display size, higher functionality, and smaller size, lighter weight, and lower power consumption. Folding types called clamshell type or flip type are also mainstream. It is becoming.

FIG. 40 is a block diagram showing a typical configuration of an electronic device using an active matrix liquid crystal display as a display element, and FIG. 41 is a time chart thereof.
As shown in FIG. 40, the CPU 5701 generates image data to be displayed and writes the image data into the video memory 5702. The CPU 5701 generates image data to be displayed by decompressing or calculating compressed images and moving image data in JPEG format or MPEG format.
The liquid crystal controller 5703 generates various timings necessary for liquid crystal display, that is, the X clock signal 5715, the horizontal synchronization signal 5714, and the vertical synchronization signal 5718 of the X driver 5713, and the image data in the order to be displayed from the video memory 5702. Is sent to the drivers of the liquid crystal display 5708 (X driver 5713 and Y driver 5707). Here, the X driver 5713 includes an m-stage shift register 5704, an m-word latch 5705, and m DA converters 5706 when the pixels of the liquid crystal display 5708 are configured by n rows and m columns.

  The liquid crystal controller 5703 generates a vertical synchronization signal 5718 and sends it to the Y driver 5707 when reading the top pixel of the display frame. At the same time, the liquid crystal controller 5703 reads data to be displayed on the pixel in the first row and the first column of the liquid crystal display 5708 from the video memory 5702 and sends the data as a display data signal 5716 to the data terminal of the latch 5705.

  As shown in FIG. 41, the shift register 5704 reads the horizontal synchronization signal 5714 generated by the liquid crystal controller 5703 in synchronization with the X clock signal 5715, and latches the signal X1 latch (see FIG. 41 (c)). With this signal, data displayed on the pixel in the first row and first column is latched in the first column of the latch 5705. Subsequently, the liquid crystal controller 5703 reads out and outputs data to be displayed on the next pixel from the video memory 5702. The shift register 5704 of the X driver 5713 shifts the horizontal synchronization signal 5714 by one, generates a signal X2 latch (FIG. 41D) for latching the image data of the second column, and the first row and second column. Latch image data.

  Thereafter, the shift register 5704 sequentially shifts the horizontal synchronization signal 5714 and sequentially latches data to be displayed on the first row. When the latch 5705 finishes storing the data for one row, the next horizontal synchronization signal 5714 (FIGS. 41A and 41H, FIG. 40A is the same as FIG. Note that the time scale of the horizontal axis is changed between () to (k), so (h) is re-displayed in addition to (a) for the horizontal synchronizing signal which is the same signal) and DA. The converter 5706 DA converts the data held in the latch 5705 and outputs it to the Xi-th (1 ≦ i ≦ m) of the column electrode 5710. At the same time, the Y driver 5707 outputs a selection signal to the first row electrode Y1.

Similarly, the Y driver 5707 sequentially shifts the selection signal output to the Yjth (1 ≦ j ≦ n) of the row electrode 7509 every time the horizontal synchronizing signal 5714 is output.
40 is an enlarged view of one pixel portion of the liquid crystal display 5708 arranged in a matrix. When the Yj-th row electrode 5709 is selected, the active switch element 5711 transmits the output of the DA converter 5706 output to the Xi-th column electrode 5710 to the pixel electrode 5712. Note that one DA converter 5706 may be placed on the liquid crystal controller side, and the data 5716 may be transmitted as an analog signal. In this case, the latch 5705 is an analog sample and hold circuit. This method can reduce the number of DA converters and has been used in the past. However, even if it is a DA converter, the voltage value finally applied to the pixel electrode 5712 may be a predetermined value. Since digital circuits such as pulse width modulation can be used and an analog sample-and-hold circuit is not required, the method described here has become mainstream as the density of LSIs increases.

However, in this method, since data is sent as digital signals, the number of signal lines is very large, and for example, a total of 24 bits of 8 bits × 3 primary colors are required.
Note that after the display signal at the right end of the screen row is output from the liquid crystal controller 5703, the time until the display signal at the left end of the next row is output, or after the image data on the bottom row of the screen has been output. The time until the image data of the first row of the next frame is output is called a (horizontal or vertical) blanking period or blanking period, and cannot be set to 0 in the CRT, but may be 0 in the liquid crystal display 5708. Good. FIG. 41 illustrates a case where a horizontal blanking period for one pixel and a vertical blanking period for one row are taken.

In an electronic apparatus using an image sensor such as a digital camera, the direction of signal transmission is reversed from that in the case of using the liquid crystal display 5708, and the same circuit configuration is taken.
In an electronic apparatus incorporating such a display element and an image sensor, there is a demand for a large display, high resolution, and a small and lightweight device. For this reason, there are often a plurality of mounting boards on which the electronic device of FIG. 40 is mounted. In that case, the mounting boards are often separated by a dashed line 5717-5717 ′ in FIG.

  Inevitably, the connection between the CPU 5701 and the liquid crystal display 5708 becomes long. In addition, when the image sensor is mounted in the configuration of FIG. 40, the direction of signal transmission is reversed from that in the case of using the liquid crystal display 5708, and the same circuit configuration is taken. The connection between them becomes longer.

  Further, along with the increase in resolution of the liquid crystal display 5708, the image sensor, etc., the signal frequencies of those lines have increased, making it difficult to connect to the CPU 5701. In particular, the clamshell structure has a structure in which both are connected via a thin hinge portion. For this reason, as the resolution of the display element and the image sensor increases, the amount of data exchanged between the two boards when the mounting boards are separated by the one-dot chain line 5717-5717 ′ in FIG. It has become. In order to solve this problem, as a high-speed data transmission system, for example, it has been proposed to use (LVDS: Low Voltage Differential Signaling) for connection of a display body and an image sensor (Patent Document 1 and Patent Document 2). In Patent Document 3 and Patent Document 4, etc., a new method has been proposed as a sufficient solution cannot be obtained even with this method.

  In addition, the progress of semiconductor manufacturing technology is remarkable, and the degree of integration is increasing as a system-on-chip, and there is a tendency that all semiconductor circuits that fall within one chip are mounted on one chip. Therefore, the number of pins for connecting the semiconductor chip and the external circuit is enormous, and it is not uncommon to exceed several hundreds. In addition, the operating frequency of the semiconductor circuit is increased, and in the conventional method of connecting to the outside through wire bonding, high frequency characteristics become a problem, and it is difficult to exchange signals with the outside correctly. In order to solve such a problem, Non-Patent Document 1 reports research on wireless connection between chips.

Japanese Patent No. 3086456 (column 44) Japanese Patent No. 3330359 (column 46) Japanese Patent No. 3349426 Japanese Patent No. 3349490

161 page of the Nikkei Microdevice December 2003 issue

However, recent progress in the enlargement of display bodies is remarkable, and sufficient performance cannot be obtained even with these technologies. In order to obtain sufficient anti-noise characteristics (interference resistance and coherence), careful design and adjustment are required. Further, in LVDS, since the signal level is small, an analog signal is inevitably handled by a digital IC, and there is a problem that power consumption increases.
In addition, in order to transmit a signal with high accuracy, matched impedance termination is required. However, since the number of lines that need impedance termination is large and the transmission impedance is about 100 ohms at most, the termination resistance is not limited. There was also a problem that the power consumed was unacceptably large.

  Furthermore, when the mounting substrate is divided by the one-dot chain line 5717-5717 ′ shown in FIG. 40, it is necessary to transmit a large amount of data at high speed through a line routed by a long wiring. For this reason, the radiation electromagnetic field from a track | line increases, and becomes a factor of the electromagnetic wave interference to another electronic device or an own apparatus. In the conventional signal transmission through the signal line, the amplitude level at the power receiving end is defined, and even if sufficient quality is ensured at the power receiving end, the amplitude level of the signal cannot be lowered. In other words, EMI countermeasures become difficult, resulting in restrictions on equipment design and cost increase. On the transmission side, in addition to the load at the power receiving end, the stray capacitance of the line is simultaneously driven, so that extra energy is required for signal transmission. That is, the result is an increase in power consumption.

Further, the increase in the number of wirings accompanying the increase in the transfer data requires a physical space for wiring, which naturally imposes great restrictions on the device design.
In particular, when the wiring passes through a movable part such as a hinge part in a clamshell type structure, etc., the characteristic impedance changes depending on the bending state of the movable part, so impedance mismatch occurs depending on the situation, and the signal is reflected by reflection at the bent part, etc. Causes deterioration. For this reason, there are problems that the speed of data to be transmitted is limited and that the mounting method and the arrangement of parts are restricted.

In addition, in order to cope with higher resolution and higher speed of display elements and image sensors, the number of signals exchanged through the hinge section is several tens, and wiring on the board cannot be used. The board is connected via the connector. The connection using a flexible substrate or a connector has the disadvantages of high cost and low connection reliability.
These problems can be solved at once by introducing the conventional wireless communication technology in the same electronic device and wirelessly transferring the data transfer of the part where wiring is difficult by the electromagnetic wave signal.

However, in order to introduce the conventional wireless communication technology into data transfer in an electronic device, the mechanism is very complicated compared to the case where transmission is performed by a conductor, and there is a problem that the implementation is difficult. It was.
In addition, information transmission by the conventional wireless communication technology has a problem in safety because an electromagnetic wave signal used for communication leaks even within the same electronic device. That is, there is a problem that the security of communication is threatened by eavesdropping.

Therefore, the present invention improves a conventional wireless communication technique and can be applied to data transmission in the same electronic device, and provides a method for high-speed data transmission having various problems and limitations as described above. The first object is to realize a highly reliable electronic device and wireless communication terminal at low cost by eliminating the drawbacks and limitations of the conventional information transmission method.
In addition, the present invention solves various problems and restrictions related to information transmission in the same electronic device by the application of wireless communication technology, and solves the disadvantages of the conventional information transmission method. A second object is to realize a highly reliable electronic device and wireless communication terminal that eliminates the restrictions and is low in cost.

The information transmission system of the present invention comprises wireless communication means for transmitting first category information and wired communication means for transmitting second category information, and wireless communication of the first category information and wired communication of the second category information. The communication is performed within one communication link.
According to the above configuration, transmission of a signal group that is difficult to transmit at high speed is transmitted wirelessly, various problems associated with high-speed transmission data are avoided, and signals such as synchronization information necessary for wireless transmission are transmitted by wire. Thus, it is possible to avoid complication of the system due to the wireless connection.

  This makes it possible to transmit high-speed data transmission signals through space without complicating the system, eliminating the need for such wiring and simplifying wiring such as flexible boards and connectors, resulting in high costs. And reliability problems are eliminated. In addition, it is possible to avoid the problem of power consumption that increases with the termination of impedance matching and the increase in data transmission speed. Also, restrictions on wiring routing and component placement can be relaxed, and the design and usability of the electronic device can be improved. Furthermore, since the electromagnetic waves used for signal transmission are performed at a close distance in the same system, it is only necessary to ensure communication within this distance, and the intensity of the radiated electromagnetic waves can be lowered to the limit. EMI characteristics are essentially improved and countermeasures become easier. Note that one communication link refers to a period in which communication is performed without interruption, and transmission and reception are performed at least once in one communication link.

An electronic device according to the present invention includes a wireless communication unit that wirelessly communicates first category information and a wired communication unit that performs wired communication of second category information, and the wireless communication of the first category information and the second category information The wired communication is performed within one communication link.
According to the above configuration, since various problems associated with information transmission in the electronic device can be eliminated by the information transmission, the electronic device can be easily realized.

The electronic device of the present invention includes a wireless communication unit that wirelessly communicates first category information, and a wired communication unit that performs wired communication of second category information used for control or processing of the first category information. And
According to the above configuration, a part of information transmitted by wireless communication can be handled by wired communication, and the first category information can be transmitted by wireless communication while reducing the load on wireless communication. It becomes. For this reason, problems associated with wireless communication such as security degradation and circuit scale increase can be alleviated, while problems associated with wired communication such as an increase in the number of wires and component placement restrictions can be alleviated. It is possible to cope with downsizing and thinning of an electronic device while supporting screen display and multi-function.

  An electronic device according to the present invention includes an information transmission unit that transmits first category information, an encryption unit that encrypts first category information of the information transmission unit, and a first category encrypted by the encryption unit. A wireless transmission unit that transmits information by an electromagnetic wave signal, a wireless reception unit that receives an electromagnetic wave signal transmitted by the wireless transmission unit, a decryption unit that decrypts a signal received by the wireless reception unit, and a second encryption key A key generation unit that generates category information, and a wired communication unit that distributes the encryption key generated by the key generation unit to the encryption unit and the decryption unit by wired communication.

  According to the above configuration, since information exchanged wirelessly in the electronic device is sent by encryption, even if it is leaked to a third party, it cannot be decrypted unless there is an encryption key, and safety can be improved. it can. Since the encryption key can be updated frequently and is transmitted to the other party by wired communication, the encryption key does not pass to a third party. In other words, there is no key distribution problem (KDP) that becomes a problem when using encryption.

  An electronic device according to the present invention includes an information transmission unit that transmits first category information, a random number generation unit that generates random numbers as second category information, and a wired transmission that distributes the random numbers generated by the random number generation units by wired communication. A communication unit, an addition unit that adds the random number to the first category information transmitted by the information transmission unit, a wireless transmission unit that transmits information added by the addition unit using an electromagnetic wave signal, and transmission from the wireless transmission unit And a subtracting unit that subtracts and decodes the random number from information received by the wireless communication unit.

According to the above configuration, since information exchanged wirelessly in the electronic device is added to the random number, even if it is leaked, the third party cannot know the contents, and safety is ensured. Since the random number can be changed frequently and transmitted to the receiving side by wired communication, the added random number is not stolen by a third party.
An electronic apparatus according to the present invention includes: an information transmission unit that transmits first category information; a spread code generation unit that generates a spread code as second category information; and a spread code generated by the spread code generation unit via wired communication A wired communication unit that distributes, a modulation unit that spread-modulates the first category information transmitted by the information transmission unit using the spreading code, a wireless transmission unit that transmits information modulated by the modulation unit using electromagnetic waves, A radio receiving unit that receives an electromagnetic wave signal, and a demodulation unit that despreads information received by the radio receiving unit using the spreading code.

  According to the above configuration, the information exchanged wirelessly in the electronic device is spread modulated by the spread code, so even if a signal leaks, the third party cannot demodulate unless there is a spread code. Safety cannot be assured. Since the spreading code can be changed frequently and transmitted to the receiving side by wired communication, the spreading code is not stolen by a third party. Further, by gaining a diffusion gain, this wireless communication path does not affect the electronic device, and conversely, it is not affected by an electromagnetic wave signal or electromagnetic noise emitted from the electronic device.

The wired communication unit of the electronic device according to the present invention is characterized in that a signal is superimposed on a power line to communicate.
According to the above configuration, since the wired communication unit performs communication using a signal superimposed on the power supply line, there is no need for special wiring for that purpose, and a large amount of data can be easily transmitted with a very small number of wirings. Become.

The electronic device of the present invention includes an electromagnetic wave conversion unit that converts the first category information into an electromagnetic wave signal, and an electromagnetic wave restoration unit that receives the electromagnetic wave signal and restores the first category information to the first category information.
According to the above configuration, wireless transmission using electromagnetic waves (radio waves) for signal transmission can be achieved with a simple configuration. In particular, since a common control signal transmitted by wire is used on the transmitting side and the receiving side where signals are transmitted wirelessly, it is possible to absorb variations in characteristics and timing at the transmitting and receiving ends, and high-precision components Even if it is not used, high-quality communication can be secured.

The electromagnetic wave conversion unit and the electromagnetic wave restoration unit of the electronic device of the present invention are driven by a carrier wave generated by the same carrier wave oscillator.
According to the above configuration, since both the transmission side and the reception side where signals are transmitted wirelessly are driven by a carrier wave generated by a common signal transmitted by wire, it is necessary to synchronize synchronous detection on the reception side There is no. Therefore, it is possible to ensure high-quality communication with a simple circuit configuration without using high-precision components at the transmitting and receiving ends.

In the electronic device of the present invention, the electromagnetic wave conversion unit performs spread spectrum modulation, the electromagnetic wave restoration unit performs spectral despreading, and synchronization information of the electromagnetic wave conversion unit and the electromagnetic wave restoration unit is transmitted by wire. To do.
According to the above configuration, a plurality of signals can be multiplexed and transmitted without being serialized by spread spectrum modulation, and real-time characteristics are good. In addition, since a spreading gain can be obtained, it is possible to construct a robust system with little interference caused by a transmitted electromagnetic wave signal to the system or less interference from the system. Furthermore, since synchronization information is transmitted by wire at the transmission and reception ends, a synchronization circuit for capturing synchronization from the received electromagnetic wave signal becomes unnecessary at the reception end, and a simple despreading circuit can be used, simplifying the circuit easily It is.

In the electronic device of the present invention, the electromagnetic wave conversion unit modulates to a UWB signal, the electromagnetic wave restoration unit demodulates from the UWB signal, and synchronization information of the electromagnetic wave conversion unit and the electromagnetic wave restoration unit is transmitted by wire. It is characterized by that.
According to the above configuration, even in the strong electromagnetic field environment of an electronic device whose basic function is the generation of electromagnetic waves, such as a mobile phone that communicates by radio waves, it is fast and reliable due to UWB-specific broadband characteristics and low spectral density characteristics. High data transmission is possible. With UWB communication, the maximum radiated electromagnetic field allowed by law is relaxed, and the design on the receiving side becomes easier. Furthermore, since the UWB modulator and demodulator use the same synchronization information transmitted by wire, no circuit for synchronization extraction is required on the receiving side, and the circuit can be simplified.

  An electronic device according to the present invention includes a wireless transmission unit that modulates first category information and transmits it as an electromagnetic wave signal, a wireless reception unit that receives and demodulates the electromagnetic wave signal, and a wired line that superimposes and transmits the second category information on a power line. A transmission unit, and a wired reception unit that separates a signal superimposed on the power line, wherein the first category information and the second category information are transmitted in one communication link by the wireless transmission unit and the wired transmission unit, The wireless transmission unit and the wireless reception unit are supplied with power from the common power line.

  According to the above configuration, transmission of a signal group that is difficult to transmit at high speed is transmitted wirelessly, various problems associated with high-speed transmission data are avoided, and signals such as synchronization information necessary for wireless transmission are superimposed on the power line. However, by transmitting by wire, it is possible to avoid complication of the system due to the wireless connection, and also to share the wired path with the power supply line, thereby reducing the difficulty associated with the wiring.

  This makes it possible to transmit high-speed data transmission signals through space without complicating the system, eliminating the need for such wiring and simplifying wiring such as flexible boards and connectors, resulting in high costs. And reliability problems are eliminated. In addition, it is possible to avoid the problem of power consumption that increases with the termination of impedance matching and the increase in data transmission speed. Also, restrictions on wiring routing and component placement can be relaxed, and the design and usability of the electronic device can be improved. Furthermore, since the electromagnetic waves used for signal transmission are performed at a close distance in the same system, it is only necessary to ensure communication within this distance, and the intensity of the radiated electromagnetic waves can be lowered to the limit. EMI characteristics are essentially improved and countermeasures become easier. In addition, since the wired path is also shared with the power line, the difficulty associated with wiring can be reduced.

  The wireless transmission unit of the electronic device of the present invention includes a control unit that generates a reference signal, and a modulation unit that converts the first category information into an electromagnetic wave signal in synchronization with the reference signal, and the wired transmission unit and The second category information transmitted and received by the wired receiver is the reference signal, and the wireless receiver includes a demodulator that demodulates the first category information in synchronization with the reference signal received by the wired receiver. It is characterized by comprising.

According to the above configuration, since the wireless transmission unit and the wireless reception unit can operate in synchronization with the same reference signal, a circuit for synchronization is unnecessary on the reception side, and the first category information is transmitted and received. The hardware configuration can be greatly simplified.
The wireless transmission unit of the electronic device according to the present invention includes a control unit that oscillates a reference signal, a first carrier oscillation unit that oscillates a carrier wave synchronized with the reference signal, and a carrier wave generated by the carrier wave oscillation unit. The second category information transmitted / received by the wired transmission unit and the wired reception unit is the reference signal, and the wireless reception unit is received by the wired reception unit. And a second carrier oscillation unit that oscillates a carrier wave synchronized with the reference signal, and a demodulation unit that demodulates the first category information using the carrier wave generated by the second carrier oscillation unit.

  According to the above configuration, since the radio transmission unit and the radio reception unit can be operated by a carrier wave generated in synchronization with the same reference signal, a synchronization acquisition and tracking circuit for carrier wave reproduction on the reception side is unnecessary. Thus, the hardware configuration for transmitting and receiving the first category information can be remarkably simplified.

  The wireless transmission unit of the electronic device according to the present invention includes a control unit that oscillates a reference signal, a first carrier oscillation unit that oscillates a carrier wave synchronized with the reference signal, and a carrier wave generated by the carrier wave oscillation unit. The second category information transmitted and received by the wired transmission unit and the wired reception unit is the reference signal, and the wireless reception unit, A first carrier information is received by the wired receiver using a second carrier oscillator that oscillates a carrier wave synchronized with the reference signal received by the wired receiver, and a carrier wave generated by the second carrier oscillator. A demodulator that demodulates in synchronization with the reference signal is provided.

  According to the above configuration, the wireless transmission unit and the wireless reception unit can be synchronized with one reference signal superimposed on the power supply line, and operate with a carrier wave that is generated in synchronization with the reference signal. Therefore, a circuit for synchronization on the receiving side and a circuit for carrier wave recovery are not necessary, and the hardware configuration for transmitting and receiving the first category information can be remarkably simplified.

The wireless transmission unit of the electronic device according to the present invention modulates the first category information by phase modulation, generates modulation / demodulation carrier information from the reference signal wired as the second category information, and is transmitted by the wireless transmission unit The transmission packet is synchronized with a reference signal transmitted by wire as the second category information.
According to the said structure, the radio | wireless transmission part and radio | wireless receiving part which transmit / receive 1st category information are realizable with simple circuit structure, and it can be wireless by the electromagnetic waves (electric wave) of signal transmission. In particular, the transmission side and reception side where signals are transmitted wirelessly use a common control signal that is superimposed and transmitted on the power supply line, so it is possible to absorb variations in characteristics and timing at the transmission and reception ends, and high accuracy High quality communication can be secured without using any parts.

  The wireless transmission unit of the electronic device of the present invention modulates the first category information by spread spectrum modulation, and the wireless reception unit despreads and demodulates the first category information, and synchronization information of a modulation / demodulation spread code Alternatively, the carrier wave information is generated from the reference signal transmitted by wire as the second category information and is synchronized.

  According to the above configuration, a plurality of signals can be multiplexed and transmitted without being serialized by spread spectrum modulation, and real-time characteristics are good. In addition, since a spreading gain can be obtained, it is possible to construct a robust system with little interference caused by a transmitted electromagnetic wave signal to the system or less interference from the system. Furthermore, since synchronization information or carrier wave information is transmitted by being superimposed on the power supply line at the transmission / reception end, the reception end can use the signal to reproduce the synchronization timing and carrier wave. A synchronization circuit is unnecessary, a simple despreading circuit can be used, and the circuit can be easily simplified. Further, the carrier wave can be reproduced with a simple circuit, and the circuit can be simplified. Moreover, since the second category information is superimposed on the power supply line, the number of wirings can be minimized.

The wireless transmission unit of the electronic device of the present invention modulates the first category information by UWB modulation, and the synchronization information of the pulse template for demodulation is generated from the reference signal that is wired and transmitted as the second category information. It is characterized by being taken.
According to the above configuration, high-speed and highly reliable data transmission is possible even in a strong electromagnetic field environment of an electronic device in which generation of electromagnetic waves, such as a mobile phone that communicates by radio waves, is a basic function. With UWB communication, the maximum radiated electromagnetic field allowed by law is relaxed, and the design on the receiving side becomes easier. Furthermore, since the UWB modulator and demodulator use the same synchronization information transmitted by wire, no circuit for synchronization extraction is required on the receiving side, and the circuit can be simplified. Moreover, since the second category information is superimposed on the power supply line, the number of wirings can be minimized.

The second category information of the electronic device of the present invention includes synchronization information or carrier wave information related to wireless communication of the first category information.
According to the above configuration, the procedure and circuit for acquisition of synchronization can be omitted on the reception side during wireless transmission, and the circuit for wireless transmission can be simplified. Further, since the transmission side and reception side carrier waves can always be tracked during radio transmission, the accuracy of the carrier wave oscillator can be remarkably eased, and the accuracy of the hardware for transmitting and receiving the first category information is remarkably improved. Can be mitigated and has great cost merit.

The second category information of the electronic device according to the present invention includes information indicating a reception state of the first category information, and is transmitted from the reception side of the first category information to the transmission side.
According to the above configuration, the reception status is simply fed back from the reception side to the transmission side according to the reception status of the information transmitted wirelessly, and reception quality can be easily ensured. In addition, since it can be controlled to the minimum transmission power for receiving the first category information, it is easy to take measures against EMI and to ensure safety against information leakage.

The first category information of the electronic device according to the present invention includes any one of image data, text data, and audio data.
According to the above configuration, it is possible to easily realize various electronic devices that handle multimedia information such as images, sounds, and texts.
The electronic apparatus according to the present invention includes a storage unit that stores the first category information, a display body that displays the first category information, and the first category information from the storage unit according to a driving order of the display body. A display control unit that reads out and outputs, and a display body driving unit that drives the display body based on the first category information read out by the display control unit.

  According to the above configuration, the display information to be displayed on the liquid crystal can be transmitted through the space without complicating the system, wiring for that is unnecessary, and wiring such as a flexible substrate and a connector can be simplified. This eliminates the problem of high cost and reliability caused by. In addition, it is possible to avoid the problem of power consumption that increases with the termination of impedance matching and the increase in data transmission speed. Also, restrictions on wiring routing and component placement can be relaxed, and the design and usability of the electronic device can be improved. Furthermore, since the electromagnetic waves used for signal transmission are performed at a close distance in the same system, it is only necessary to ensure communication within this distance, and the intensity of the radiated electromagnetic waves can be lowered to the limit. EMI characteristics are essentially improved and countermeasures become easier.

The electronic apparatus according to the present invention includes an imaging device and imaging control means for reading and outputting an image signal captured by the imaging device as the first category information.
According to the above configuration, since the exchange of signals between the image sensor and the host side using the image data obtained by the image sensor is wireless, no wiring is required between them, and the exposure is increased as the image sensor becomes larger. Can avoid various problems. In other words, it can be easily mounted even in a clamshell structure, eliminates the need for wiring such as flexible boards and connectors, eliminates the problems of high cost and reliability caused by these, and what effect can be applied to high transmission speeds. is there. In particular, in a camera, the optical system and electronic components must be mounted in the same housing, and there are many restrictions on electronic component mounting. However, the above-described configuration of the present invention can alleviate these restrictions.

The electronic device of the present invention is characterized in that information transmitted between an electronic circuit on an integrated circuit and the outside of the integrated circuit is wirelessly transmitted as first category information.
According to the above configuration, since some of the input / output pins of the package of the semiconductor integrated circuit can be wireless, the number thereof can be reduced and the size and cost of the package can be reduced.
An electronic apparatus according to the present invention includes a display unit, a speaker unit, and a data source unit that generates image data to be displayed on the display unit and acoustic data for driving the speaker unit, and the display unit or the speaker unit and the data The image data and the sound data transmitted between the source units are wirelessly transmitted as first category information.

According to the above configuration, the speaker and the display of the multimedia device that handles video data and audio data can be wirelessly connected to the tuner recorder unit with simple hardware, and the interconnection can be facilitated.
A wireless communication terminal according to the present invention includes a first housing portion, a second housing portion coupled to the first housing portion, and between the first housing portion and the second housing portion. A connecting portion for connecting the first housing portion and the second housing portion so that the positional relationship can be changed; and an external wireless communication antenna mounted on the first housing portion or the second housing portion. An external wireless communication control unit that is mounted on the first housing unit and mainly controls external wireless communication performed via the external wireless communication antenna, and a display unit that is mounted on the second housing unit And a first internal wireless communication antenna mounted on the first housing portion, a second internal wireless communication antenna mounted on the second housing portion, and mounted on the first housing portion. First internal wireless communication control for controlling internal wireless communication performed via the first internal wireless communication antenna A second internal wireless communication control unit that is mounted on the second housing unit and controls internal wireless communication performed via the second internal wireless communication antenna; the first housing unit or And a wired communication unit mounted on the second casing unit for exchanging a part of information transmitted by the internal wireless communication by wire.

  According to the above configuration, it is possible to wirelessly transmit data between the casings of the wireless communication terminals while assisting wireless communication with wired communication. Therefore, in response to the increase in resolution of the display unit mounted on the wireless communication terminal, even when the amount of data exchanged between the cases increases, while suppressing the increase in the number of wires between the cases, Data communication between the cases can be performed without any delay. As a result, even when the clamshell structure is adopted for the wireless communication terminal, it is possible to suppress the complexity of the structure of the connecting portion, and it is possible to prevent the mounting process from becoming complicated and increase the cost. It is possible to reduce the size and thickness of the wireless communication terminal and increase the reliability while suppressing the wireless communication terminal, and to increase the screen size and multifunction of the wireless communication terminal without impairing the portability of the wireless communication terminal. be able to.

The perspective view which shows a state when the clamshell type mobile telephone to which the radio | wireless communication control method of this invention is applied is opened. The perspective view which shows a state when the clamshell type mobile telephone to which the radio | wireless communication control method of this invention is applied is closed. The perspective view which shows the external appearance of the rotary mobile telephone to which the radio | wireless communication control method of this invention is applied. The block diagram which shows the principal part of one Example of this invention. Sectional drawing which shows one Example of the electronic device of this invention. The block diagram which shows one Example of the electronic device using the information transmission system of this invention. The block diagram which shows the other Example of the electronic device using the information transmission system of this invention. The block diagram which explains in more detail the modulator and demodulator of Example 5 and Example 6 of the electronic device concerning this invention. FIG. 9 is a time chart detailing Example 7 and Example 8 according to the present invention. The block diagram of the principal part of the Example of the other electronic apparatus concerning this invention. The block diagram which shows the principal part of other one Example of the electronic device concerning this invention. The block diagram which shows the principal part of the further another Example of the electronic device concerning this invention. The block diagram which shows the principal part of other one Example of the electronic device concerning this invention. The block diagram which shows the principal part of other one Example of the electronic device concerning this invention. The block diagram which shows the principal part of other one Example of the electronic device concerning this invention. Sectional drawing which shows another one Example of the electronic device of this invention. The block diagram which shows another one Example of the electronic device concerning this invention. The block diagram which explains in more detail the modulator and demodulator of Example 16 of the electronic device concerning this invention. The block diagram which shows the principal part of the further another Example of the electronic device concerning this invention. The block diagram which shows the principal part of the further another Example of the electronic device concerning this invention. The block diagram which shows the principal part of the further another Example of the electronic device concerning this invention. The block diagram of other one Example of the superimposition circuit and isolation | separation circuit of an electronic device concerning this invention. The block diagram which shows the principal part of other one Example of the electronic device concerning this invention. The block diagram which shows the principal part of other one Example of the electronic device concerning this invention. The block diagram which shows another one Example of the electronic device of this invention. The block diagram which shows another one Example of the electronic device of this invention. The block diagram which shows another one Example of the electronic device of this invention. The block diagram which shows another one Example of the electronic device concerning this invention. The block diagram which shows another one Example of the electronic device of this invention. The block diagram which shows another one Example of the electronic device of this invention. The block diagram which shows another one Example of the electronic device of this invention. The figure which shows one Example of the timing of wired communication and radio | wireless communication. The figure which shows the other Example of the timing of wired communication and radio | wireless communication. The figure which shows the further another Example of the timing of wired communication and radio | wireless communication. The figure which shows the further another Example of the timing of wired communication and radio | wireless communication. The figure which shows the further another Example of the timing of wired communication and radio | wireless communication. The figure which shows the further another Example of the timing of wired communication and radio | wireless communication. The figure which shows the further another Example of the timing of wired communication and radio | wireless communication. The figure which shows the further another Example of the timing of wired communication and radio | wireless communication. FIG. 10 is a block diagram illustrating an electronic device having a conventional liquid crystal display body. FIG. 6 is a time chart for explaining the operation of an electronic apparatus having a conventional liquid crystal display body.

  Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing a state when a clamshell mobile phone to which the wireless communication control method of the present invention is applied is opened, and FIG. 2 is a clamshell mobile phone to which the wireless communication control method of the present invention is applied. It is a perspective view which shows a state when a telephone is closed.
In FIG. 1 and FIG. 2, an operation button 4 is disposed on the surface of the first housing unit 1, and a microphone 5 is provided at the lower end of the first housing unit 1. An external wireless communication antenna 6 is attached to the upper end. In addition, a display body 8 is provided on the surface of the second housing portion 2, and a speaker 9 is provided on the upper end of the second housing portion 2. In addition, a display body 11 and an imaging element 12 are provided on the back surface of the second housing portion 2. As the display bodies 8 and 11, for example, a liquid crystal display panel, an organic EL panel, a plasma display panel, or the like can be used. As the image sensor 12, a CCD or CMOS sensor can be used. The first housing unit 1 and the second housing unit 2 include internal wireless communication antennas 7 and 10 that perform internal wireless communication between the first housing unit 1 and the second housing unit 2, respectively. Is provided.

  And the 1st housing | casing part 1 and the 2nd housing | casing part 2 are connected via the hinge 3, and the 2nd housing | casing part 2 is made into 1st by rotating the 2nd housing | casing part 2 by using the hinge 3 as a fulcrum. It can be folded on the housing part 1. The operation button 4 can be protected by the second housing unit 2 by closing the second housing unit 2 on the first housing unit 1, and the operation button 4 may be mistaken when carrying a mobile phone. Operation can be prevented. Further, by opening the second housing part 2 from the first housing part 1, the operation button 4 can be operated while viewing the display body 8, a telephone call can be made using the speaker 9 and the microphone 5, and the operation button 4 can be operated. Imaging can be performed while operating.

  Here, by using the clamshell structure, the display body 8 can be disposed on almost the entire surface of the second housing portion 2, and the size of the display body 8 can be increased without deteriorating the portability of the mobile phone. It is possible to improve visibility.

  Further, by providing the internal wireless communication antennas 7 and 10 in the first housing portion 1 and the second housing portion 2, respectively, the first housing is achieved by internal wireless communication using the internal wireless communication antennas 7 and 10. Data transmission between the unit 1 and the second housing unit 2 can be performed. For example, image data and audio data captured by the first housing unit 1 via the external wireless communication antenna 6 are transferred to the second housing unit 2 by internal wireless communication using the internal wireless communication antennas 7 and 10. , And an image can be displayed on the display body 8 or sound can be output from the speaker 9. In addition, image data captured by the image sensor 12 is sent from the second housing unit 2 to the first housing unit 1 by internal wireless communication using the internal wireless communication antennas 7 and 10, and is used for external wireless communication. It can be sent to the outside via the antenna 6.

  Thereby, it is not necessary to perform data transmission between the first casing unit 1 and the second casing unit 2 by wire, and it is not necessary to pass the flexible wiring board having multiple pins through the hinge 3. For this reason, it becomes possible to suppress the complexity of the structure of the hinge 3 and to prevent the mounting process from becoming complicated, thereby reducing the size and thickness of the mobile phone and increasing the reliability while suppressing an increase in cost. It is possible to increase the screen size and functionality of the mobile phone without impairing the portability of the mobile phone.

  The external wireless communication antenna 6 is mounted on the first casing 1, but may be mounted on the second casing 2. In this case, the external radio communication antenna 6 is not blocked by the second casing 2 during use, and efficient communication can be expected. In this case, power is supplied to the external wireless communication antenna 6 from the communication control unit of the mobile phone built in the first housing unit 1 by a coaxial cable or the like.

  In addition, when internal wireless communication is performed between the first housing unit 1 and the second housing unit 2, the second category information used for control or processing of the first category information transmitted by the internal wireless communication is the first category information. You may make it communicate between the 1 housing | casing part 1 and the 2nd housing | casing part 2 with a wire communication. Thereby, transmission of a signal group that is difficult to transmit at high speed is transmitted wirelessly, various problems associated with speeding up of transmission data are avoided, and signals such as synchronization information necessary for wireless transmission are transmitted by wire. It is possible to avoid complication of the system due to wireless communication.

FIG. 3 is a perspective view showing the appearance of a rotary mobile phone to which the wireless communication control method of the present invention is applied.
In FIG. 3, an operation button 24 is disposed on the surface of the first housing portion 21, a microphone 25 is provided at the lower end of the first housing portion 21, and an upper end of the first housing portion 21 is provided. An external radio communication antenna 26 is attached. A display body 28 is provided on the surface of the second housing part 22, and a speaker 29 is provided on the upper end of the second housing part 22. The first casing portion 21 and the second casing portion 22 have internal wireless communication antennas 27 and 30 that perform internal wireless communication between the first casing portion 21 and the second casing portion 22, respectively. Is provided.

  The first housing portion 21 and the second housing portion 22 are connected via a hinge 23, and the second housing portion 22 is rotated horizontally around the hinge 23 as a fulcrum, thereby The first housing portion 21 can be placed on top of the first housing portion 21, or the second housing portion 22 can be shifted from the first housing portion 21. The operation button 24 can be protected by the second housing portion 22 by arranging the second housing portion 22 on the first housing portion 21, and the operation button 24 can be used when carrying the mobile phone. Can be prevented from being operated by mistake. Further, by rotating the second housing portion 22 horizontally and shifting the second housing portion 22 from the first housing portion 21, the operation button 24 can be operated while viewing the display body 28, the speaker 29 and It is possible to talk while using the microphone 25.

  Here, by providing the antennas 27 and 30 for internal wireless communication in the first housing part 21 and the second housing part 22 respectively, the first housing is used for internal wireless communication using the antennas 27 and 30 for internal wireless communication. Data transmission between the body part 21 and the second housing part 22 can be performed. For example, image data and audio data captured by the first housing unit 21 via the external wireless communication antenna 26 are transferred to the second housing unit 22 by internal wireless communication using the internal wireless communication antennas 27 and 30. The image can be displayed on the display body 28, or the sound can be output from the speaker 29.

  As a result, it is not necessary to pass the flexible wiring board having a large number of pins through the hinge 23, and it is possible to suppress the complexity of the structure of the hinge 23 and to prevent the mounting process from becoming complicated. . For this reason, it is possible to reduce the size and thickness of the mobile phone and increase the reliability while suppressing an increase in cost, and to increase the screen size and functionality of the mobile phone without impairing the portability of the mobile phone. Can be achieved.

  Further, when internal wireless communication is performed between the first casing unit 21 and the second casing unit 22, the second category information used for control or processing of the first category information transmitted by the internal wireless communication is the first category information. You may make it communicate by wire between the 1 housing | casing part 21 and the 2nd housing | casing part 22. FIG. Thereby, transmission of a signal group that is difficult to transmit at high speed is transmitted wirelessly, various problems associated with speeding up of transmission data are avoided, and signals such as synchronization information necessary for wireless transmission are transmitted by wire. It is possible to avoid complication of the system due to wireless communication.

  In the above-described embodiment, a mobile phone has been described as an example, but the present invention can also be applied to a video camera, a PDA (Personal Digital Assistance), a notebook personal computer, and the like.

FIG. 4 is a conceptual diagram showing the main part of an embodiment of the information transmission system according to the present invention.
In FIG. 4, a transmission unit block 112 and a reception unit block 113 are provided, and data is transmitted from the transmission unit block 112 to the reception unit block 113. Here, the signal block 112 is provided with a circuit element 101 having transmission information, and the reception block 113 is provided with a circuit element 104 for receiving transmission information. In addition, the transmission unit block 112 and the reception unit block 113 are provided with interface circuits 103 and 105 that communicate with each other via a wired path 107, respectively, and a transmission antenna 110 that communicates with each other via a wireless propagation path 108 and Each receiving antenna 111 is provided.

The transmission information emitted from the circuit element 101 is categorized into first category information and second category information, and the first category information is modulated by the modulator 102 and transmitted from the transmission antenna 110 as an electromagnetic wave. The second category information is transmitted through the interface circuit 103 on the wired path 107.
An electromagnetic wave signal transmitted from the transmission antenna 110 and carrying the first category information propagating through the space (the radio propagation path 108) is received by the reception antenna 111, demodulated by the demodulator 106, and output to the circuit element 104. The second category information transmitted through the wired path 107 is transmitted to the circuit element 104 via the interface circuit 105. The second category information may be transmitted from the reception unit block 113 to the transmission unit block 112. In this case, the second category information is transmitted from the interface circuit 105 to the interface circuit 103.

  As the first category information, high-speed data that is difficult to transmit by wire or parallel data that requires multiplexing such as a bus line is selected. Information belonging to the first category is transmitted by radio. The electromagnetic field radiated from the transmitting antenna 110 is set so as not to exceed the upper limit determined by law. The radiation level allowed for a radio station that does not require a license is much lower than the EMI standard, but the communication distance is very close, so that a communication path with sufficient quality can be obtained by appropriately setting the link budget. Can be secured.

In this way, a large amount of information that requires high-speed transmission is not transmitted via a signal line, but propagates through space by radio, eliminating the need to use a signal line and eliminating the conventional problems of connectors and hinge structures associated therewith. be able to.
In addition, with conventional signal line transmission, the charge and discharge to the stray capacitance increases as the speed increases, and the power consumption increases, and the unnecessary radiated power emitted from the signal line increases, causing interference with surrounding equipment. There was a drawback that it was difficult to take measures. In the transmission using the signal line, since the logic level is defined, the power consumption cannot be essentially reduced, and there is only a coping therapy such as reinforcing the shield to reduce the unnecessary radiation.

  On the other hand, according to such a method of the present embodiment, it is sufficient that sufficient communication quality can be ensured at a close distance in the same system, so that the radiated power from the transmission antenna 110 can be reduced to this value. The increase in power consumption is essentially improved, and EMI countermeasures are facilitated. Moreover, it is freed from restrictions such as an increase in power consumption accompanying termination for impedance matching of the communication line, component placement, and routing of the line.

Since the communication distance used in the present invention is limited to the same housing or the same system, a simpler method than the technique used in the conventional wireless communication device can be taken.
The second category information transmitted by wire embodies the method. As the second category information, information that does not require high-speed mass data transfer, synchronization information for wireless transmission / reception, oscillator information, feedback information that feeds back a data reception state, and the like can be considered. In particular, if the synchronization information of the communication packet is transmitted by wire, a circuit for extracting the synchronization information on the receiving side becomes unnecessary, and the circuit on the receiving side can be greatly simplified.

  Also, the correlator structure can be greatly simplified by sending the correlator synchronization information necessary for spread spectrum and UWB communications. Furthermore, if the oscillator information can be transmitted, a clock signal that is a reference between transmission and reception can be shared, and the oscillation frequency accuracy required for the oscillator is remarkably relaxed, and the electronic device can be easily realized. Also, in the case of an electronic device having a short-range communication interface such as a mobile phone, Bluetooth or UWB, when the electromagnetic wave that transmits the first category information may interfere with the original communication of the electronic device, By exchanging the operation status of the electronic device between the transmission and reception of the first category information as the second category information so as not to disturb the radio wave used by the electronic device, the frequency and transmission power of the electromagnetic wave transmitting the first category information Can be changed to eliminate interference with the original communication. That is, as the second category information, the frequency of the transmission channel is selected for a mobile phone or the like, and the hopping pattern or the like is selected for Bluetooth or UWB.

  The second category information may be sent from the reception side of the first category information toward the transmission side. In this way, the reception status of the first category information is fed back. For example, a retransmission request, a request for increase / decrease in radiated electromagnetic wave energy, a pre-emphasis parameter for improving transmission path distortion, and the like are transmitted from the reception side to the transmission side. It is possible to improve the quality of communication with a small hardware cost. In particular, by feeding back the increase / decrease request of the electromagnetic wave energy to be radiated, it is possible to set the minimum electromagnetic wave energy that can ensure the communication quality on the receiving side, and to reduce unnecessary radiation. This is a signal level of the receiving end is defined, and is a value lower than the unnecessary radiated electromagnetic field energy of the high-speed data transmission by the conventional wire that is driven together with the stray capacitance with a large energy in order to secure the specified value, EMI countermeasures are extremely easy. In addition, there is no signal line to be driven including the stray capacitance, and power consumption can be reduced because transmission is performed wirelessly.

FIG. 5 is a diagram showing an embodiment of an electronic apparatus according to the present invention.
In FIG. 5, the electronic device is divided into a main body portion 205 and a display portion 209, which are integrated through a hinge 207. Here, various input / output devices such as a keyboard and a display device are connected to the electronic device. That is, the main body 205 is provided with a main body substrate 203 responsible for function control of the electronic device main body, a keyboard 204 as an input device, and a liquid crystal controller 208 that generates display data by controlling an electronic circuit on the main body substrate 203. Yes. The display unit 209 is provided with a liquid crystal display body 206 as a display device. The main body 205 and the display unit 209 are provided with a transmission antenna 212 and a reception antenna 210 for performing wireless communication with each other. The main body 205 and the display unit 209 are connected by a line 211 for performing wired communication with each other.

  The display data generated by the liquid crystal controller 208 is sent to the modulator 200 as first category information, modulated, and converted into electromagnetic waves (radio waves) from the transmitting antenna 212 and propagates through space. The electromagnetic wave signal transmitted from the transmission antenna 212 is received by the reception antenna 210, demodulated into display data by the demodulator 202, sent to the liquid crystal driver 201, and displayed on the liquid crystal display body 206.

  The synchronization signals of the modulator 200 and the demodulator 202 are transmitted to the demodulator 202 through the line 211 as second category information. This signal is not very high in data rate and requires a small number of signal lines, so that it is easy to wire through the hinge. The degree of freedom of wiring and component arrangement is also increased, and the modulator 200, the transmission antenna 212, and the demodulator 202, the reception antenna 210, which are reception units, are arranged far from the hinge 207 as shown in FIG. Is also possible.

  As data to be transmitted increases in speed, it becomes difficult to transmit the data in the transmission line, but transmission by electromagnetic waves in the space becomes easier. In this way, if a signal is sent through a wired path and synchronization between the modulator 200 and the demodulator 202 is obtained, synchronization detection for synchronization on the demodulator 202 side becomes unnecessary, and the circuit can be simplified. With the recent improvement in semiconductor device manufacturing technology, it is possible to simplify the modulator 200 and the demodulator 202 capable of high-frequency radio transmission in this way and incorporate them in an electronic device at a low cost, and have practicality. It is expensive.

FIG. 6 is a block diagram showing a more detailed configuration of the information transmission method according to the present invention and an embodiment of an electronic apparatus using the same.
In FIG. 6, the CPU 301 generates display data to be displayed by calculation or the like and records it in the video memory 302. The liquid crystal controller 303 reads data 319 to be displayed on the display body from the video memory 302 in a predetermined order, and outputs the data 319 together with the vertical synchronization signal 321 and the horizontal synchronization signal 320. Since the data 319 to be displayed is read out as data in parallel for each word in units of pixels from the normal video memory 302, the data 319 is subjected to parallel conversion by the parallel conversion circuit 304 and transmitted to the logic circuit 307. The logic circuit 307 receives the signal output from the parallel-to-serial conversion circuit 304 and the horizontal synchronization signal 320 and the vertical synchronization signal 321 output from the liquid crystal controller 303, generates a packet, and performs communication such as timing of synchronous detection. A preamble is added to the packet for synchronization required for The packet is modulated by the modulator 308 by the carrier frequency generated by the carrier wave oscillator 309, and transmitted from the transmitting antenna 310 via the final stage circuit 328. At the same time, the output of the carrier wave oscillator 309 is frequency-divided by the frequency divider 326, converted to a low frequency, and transmitted to the receiving side via the wired line 340 as one of the second category information.

The receiving antenna 311 receives the electromagnetic wave signal transmitted from the transmitting antenna 310.
The signal received by the reception antenna 311 is amplified by the preamplifier 312, and then the unnecessary band component is removed by the bandpass filter 313 and input to the demodulator 314. The demodulator 314 multiplies the frequency of the frequency divider 326 output sent through the wired path 340 as one of the second category information by the PLL 315, restores the carrier wave frequency, supplies it to the demodulator 314, and demodulates the electromagnetic wave signal. Do. The synchronization circuit 316 detects a preamble in the received signal packet, and detects a synchronization timing necessary for demodulation and a synchronization signal for driving the liquid crystal. The logic circuit 318 generates a horizontal synchronizing signal 323, a vertical synchronizing signal 324, and an X driver transfer clock 325 in synchronization with the display data 322 in the packet from the demodulated packet, and each of them is a driver of the liquid crystal display, that is, FIG. The display data signal 5716, the horizontal synchronization signal 5714, the vertical synchronization signal 5718, and the X clock signal 5715 are output to the driver of the liquid crystal display for display.

  The oscillation frequency of the carrier wave oscillator 309 is selected so as not to disturb the original purpose of an electronic device that uses radio waves such as a radio receiver or a mobile phone. If a frequency of 2 GHz or higher is selected, the occupied band is about 200 MHz even if data of 100 Mbps is transmitted, and can usually be used without problems in most cases.

  In general, in the wireless communication, the transmission side modulator 308 and the reception side demodulator 314 need to have the same carrier frequency, and the carrier oscillator frequency between transmission and reception is required to have high accuracy. The error between the two appears as direct communication quality degradation. However, according to the configuration of the present invention described above, the modulator 308 and the demodulator 314 use the same signal from the carrier wave oscillator 309 as a reference, so that no error occurs. The accuracy of the carrier wave oscillator 309 is not a problem and has a cost reduction effect. The frequency divider 326 and the PLL 315 are not essential, and the output of the carrier wave oscillator 309 may be sent directly to the demodulator 314. However, since the carrier frequency is generally high, it is difficult to transmit the wired path. It is more feasible to divide and transmit with the frequency divided as in the above configuration, and to restore the same carrier wave as the output of the carrier wave oscillator 309 by multiplying by the PLL 315.

  The evaluation circuit 327 evaluates the reception status from the output of the demodulator 314 using, for example, a reception error rate by CRC, and feeds back the result as second category information to the final stage circuit 328 through the wired path 340. The final stage circuit 328 controls the power supplied to the transmission antenna 310 so that the minimum transmission power can be ensured on the receiving side of the electromagnetic wave signal. As a result, communication quality can be maintained with much lower radiated power than unnecessary radiated power generated from a conventional wired transmission line in which the received signal level must be kept at a predetermined value, which is a fundamental EMI countermeasure.

It is also possible to add pre-emphasis or pre-distortion to the electromagnetic field generated so as to compensate the propagation path characteristics of the radiated electromagnetic field by this feedback information.
Thereby, a predetermined communication quality can be obtained with a predetermined radiation field power. In addition, transmission power and propagation path characteristics vary greatly depending on component placement, etc., and it was necessary to adjust parameters by trial and error, such as by trial manufacture, at the initial stage of device design. Since this is done automatically, there is a significant reduction in development man-hours. The method of this embodiment for controlling the transmission side and maintaining the new communication quality is based on the conventional wireless communication technique in which the receiver sensitivity (gain) is controlled by placing an AGC (automatic gain control) circuit on the reception side. Is a very different concept, which has the effect of simplifying the system configuration and minimizing unnecessary radiation.

  By adopting the above configuration, it is possible to wirelessly transmit a large amount of display data to be sent to the display body, which has become more apparent as the display body becomes larger, an increase in power consumption, restrictions on wiring positions, and EMI problems. Various problems caused by wired transmission such as reliability degradation can be eliminated.

In the fifth embodiment, the horizontal synchronizing signal and the vertical synchronizing signal of the display body are packetized and transmitted as the first category information via the electromagnetic wave path 329, but the output of the liquid crystal controller 303 is directly transmitted to the logic circuit 318 in the second category. Information may be transmitted on a wired path.
FIG. 7 is a block diagram showing a more simplified main part of the information transmission system and the electronic apparatus using the same according to the present invention, and an embodiment in which the logic circuit 307 and the synchronization circuit 316 are simplified based on the above concept. Show. The names and functions of the blocks with the same numbers as in FIG. 7 are the same as those in FIG.

  In FIG. 7, the horizontal synchronization signal 320 and the vertical synchronization signal 321 output from the liquid crystal controller 303 are sent to the reception side by wire as second category information. That is, the horizontal synchronization signal 320 is directly supplied to the reception-side logic circuit 318 without passing through the transmission-side logic circuit 307 of FIG. 6, and the vertical synchronization signal 321 is transmitted to the transmission-side logic circuit 307 of FIG. Without being passed, the signal is directly supplied to the demodulator 314 and the logic circuit 318 on the receiving side.

  Thus, if the transmission packet is transmitted in synchronization with these synchronization signals, the reception side does not need to detect packet synchronization to know the start of the packet, and the synchronization circuit 316 and the logic circuit 307 are unnecessary or extremely simple. become.

FIG. 8A is a diagram showing a block diagram of a main part of an embodiment of the electronic device according to the present invention, and is a diagram illustrating in more detail the modulator 308 and the demodulator 314 of the fifth and sixth embodiments. is there.
In FIG. 8A, a carrier wave oscillator 502 is a rectangular pulse oscillator corresponding to the carrier wave oscillator 309 of the fifth embodiment. The multiplier 501 multiplies the carrier wave oscillator 502 and the input data 503, outputs it as a transmission signal 504, and sends it to the transmission antenna. Multiplier 501 may be an exclusive OR circuit because both input data 503 and carrier wave oscillator 502 output are digital signals. When an analog value of value 1 is associated with logic 0 and an analog value of value -1 is associated with logic 1, the input / output of the exclusive OR circuit acts just as a multiplier. In addition, since the communication distance is extremely short, harmonic interference given to other devices and the like can be suppressed to a low level, so that a filter or the like is not required between the antenna and the modulator output.

  The demodulator 314 operates as follows. After the reception signal received by the reception antenna 311 in FIG. 6 is amplified and unnecessary bands are removed, it is input to the multiplier 505 as the reception signal 507 and multiplied by the carrier clock signal reproduced by the PLL 508, and then the low-pass filter. At 506, the high frequency component is removed and the demodulated signal 509 is demodulated. The low-pass filter 506 removes the high-frequency component of the output from the multiplier 505 (a thin pulse component generated by a slight phase shift difference between the reception signal 507 and the reproduction clock waveform of the PLL 508), and outputs it as a demodulated signal 509. The PLL 508 reproduces the carrier frequency before frequency division with reference to the output of the carrier oscillator 502 that is transmitted by wire as the second category information and frequency-divided by the frequency divider 500 to reduce the frequency.

  9A to 9C show time charts of the modulator 308 described above. 10A shows a carrier clock signal generated by the carrier oscillator 502, FIG. 10B shows transmission data 503, and FIG. 10C shows an output transmission signal 504. If the time chart of FIG. 6 is viewed as a digital circuit, the modulator 308 is an exclusive OR, and if viewed as an analog value that takes a value of ± 1, the modulator 308 is a multiplier.

FIGS. 9D to 9F show time diagrams of the demodulator according to the seventh embodiment. That is, (d) is a received signal, (e) is a pulse train generated from the PLL 508, (f) is the output of the multiplier 505, and the low-pass filter 506 is a small amount of the received signal 507 and PLL 508 output from this signal. A high frequency component caused by the phase difference is removed, and the demodulated signal 509 is restored.
As is clear from the figure, if the carrier clock (FIG. 9 (a)) and the recovered clock (FIG. 9 (e)) are different in frequency or out of phase, demodulation does not work well. In conventional wireless communication, the transmitter and the receiver have separate high-precision oscillators to minimize errors. According to this configuration of the present embodiment, the recovered clock on the receiving side is based on the carrier oscillator 502 on the transmitting side, so that a recovered clock having the same frequency can always be secured, and therefore an error due to the stability of the oscillation frequency and the frequency accuracy. Does not occur. Even with an inexpensive oscillator, it is possible to construct a very stable circuit.

Since the radio signal transmission used in the present invention has a short communication distance and can secure communication quality with a sufficiently high SN ratio, it is possible to amplify the signal to such an extent that it can be regarded as a digital value.
In this case, the amplified signal level increases to the logical value level, but the load driven by the logical value is not a long distance with a large stray capacitance from the CPU to the display body, but in the same semiconductor chip. Such an extremely short and low load does not increase power consumption. Even if the received signal 507 is an analog level that is not amplified to a logical value level, the output of the PLL 508 is a rectangle (takes a value of ± 1), so that multiplication can be realized with a simple switch circuit. That is, two amplifiers having the same absolute value of amplification degree and opposite polarities are prepared. When the logic level of the PLL 508 output is 1, the inverting amplifier output of the received signal 507 is selected by a switch. When the logic level of the PLL 508 output is 0, This can be realized by selecting the normal amplifier output of the received signal 507. A circuit having such a structure may be used as the multiplier 505.

  According to the above configuration, the modulator 308 can be realized very simply by an exclusive OR circuit, and the demodulator 314 can be realized by one exclusive OR circuit or an amplifier and switch circuit having positive and negative amplification degrees, and a low-pass filter.

FIG. 8B is a block diagram of a main part of an embodiment of the electronic device according to the present invention, and more details of another example of the modulator 308 and the demodulator 314 of the fifth and sixth embodiments. It is a figure to describe.
In the seventh embodiment, simplified BPSK modulation is taken as an example, but in the eighth embodiment, an example based on QPSK is given to show a case where more general phase modulation is used. The carrier wave oscillator 513 is a rectangular pulse oscillator corresponding to the carrier wave oscillator 309 of the fifth or sixth embodiment.
In QPSK, a transmission signal is encoded and transmitted by assigning 2 bits (ie, data bit 1 and bit 2) for each symbol. That is, with respect to the reference clock, the phase shift amount is encoded, modulated, and transmitted as shown in Table 1, for example. The encoder 512 controls the phase shifter 514 and the multiplier 515 so that the phase shift is as shown in Table 1 according to the bit pattern of the data bit 1 and the data bit 2.

FIGS. 9G to 9J are time charts showing the operation of each part of the modulator shown in FIG. 8B.
Bit 1 (FIG. 9 (h)) and bit 2 (FIG. 9 (i)) of the transmission data are encoded by the encoder 512. Then, the encoder 512 determines whether the carrier wave oscillated by the carrier wave oscillator 513 (FIG. 9 (g)) is shifted by 90 ° by the phase shifter 514, and further, the multiplier 515 inverts the carrier wave (180 ° shift). The transmission signal 515 (FIG. 9 (j)) subjected to QPSK modulation is finally output.

The frequency divider 517 corresponds to the frequency divider 326 of the fifth or sixth embodiment, and the PLL 520 corresponds to the PLL 315 of the fifth or sixth embodiment, and generates a reproduction clock (FIG. 9 (l)).
The recovered clock output from the PLL 520 is multiplied by the received signal 518 (FIG. 9 (k)) by the first multiplier 519, transmitted to the first low-pass filter 523, and the high-frequency component is removed, to the discrimination circuit 525. Reportedly. At the same time, the received signal 518 is multiplied by a pulse train (FIG. 9 (o)) obtained by shifting the regenerated clock pulse train generated by the PLL 520 by 90 ° by the 90 ° phase shifter 522 and the second multiplier 521, and the second low-pass filter. The high frequency component is removed by 524 and transmitted to the discrimination circuit 525. The discrimination circuit 525 demodulates the reception signal 518 by determining transmission data from the outputs (FIG. 9 (n) and (q)) of the first and second low-pass filters 523 and 524.

  According to the above configuration, it is possible to increase the speed of data transmission without increasing the occupied band of the transmission signal 516. In addition, since the modem can be realized by a simple digital circuit, it can be incorporated in a semiconductor chip, and an increase in cost and power consumption can be ignored. Since the recovered clock required on the receiving side is generated based on the same carrier oscillator 513 as that on the transmitting side, no error due to the accuracy of the clock frequency between transmission and reception occurs. Stable data transmission is possible even with an inexpensive oscillator. Even if the frequency of the carrier wave oscillator 513 is unilaterally changed on the transmission side, the reception side always follows, so that in an electronic device such as a radio communication device, the communication channel is not disturbed according to the communication channel. The frequency can be unilaterally selected on the transmission side. (This is the same in any of the fifth, sixth, and seventh embodiments.) That is, it is possible to remarkably facilitate interference and countermeasures against the communication originally intended for an electronic device such as a communication device.

FIG. 10 is a block diagram showing a main part of an embodiment of another information transmission method and electronic apparatus according to the present invention.
In FIG. 10, the functions of the CPU 701, video memory 702, and liquid crystal controller 703 are the same as those described in the fifth and sixth embodiments, and display data 725, horizontal synchronization signal 723, and vertical data generated by the liquid crystal controller 703 are the same. The synchronization signal 724 is multiplexed with the spreading code generated by the spreading code generator 705 and the code multiplexing circuit 704. In this embodiment, since parallel data is code-multiplexed as follows, the parallel-serial conversion by the parallel-serial conversion circuit 304 of the fifth or sixth embodiment is not necessary, and therefore the inverse conversion, that is, the serial-parallel conversion circuit 317 is performed. Is also unnecessary.

  As spreading codes, code sets that are orthogonal to each other are often used. Since the display data 725 is read from the video memory 702 for each pixel, it is output as parallel digital data. Each bit of the data signal is multiplied by each code generated by the spreading code generator 705 (or exclusive OR is performed), and analog addition is performed to perform code multiplexing. The multiplexed signal is modulated by a carrier wave generated by a carrier wave oscillator 706 by a modulator 707 and transmitted through a radio propagation path 726 by an electromagnetic wave signal as first category information from a transmission antenna 708.

  The transmitted electromagnetic wave signal is received by the receiving antenna 709, amplified by the preamplifier 710, unnecessary signals other than the predetermined band are removed by the band pass filter 711, and demodulated by the demodulator 712. The PLL 715 divides the carrier frequency generated by the carrier wave oscillator 706 by the frequency divider 713 and multiplies the signal transmitted as the second category information as a reference to restore the carrier frequency. The signal demodulated by the demodulator 712 is demultiplexed by calculating the correlation with the spreading code for multiplexing generated by the spreading code generator 716 in the despreading circuit 714. The logic circuit 717 generates a display data signal 718 for driving the liquid crystal driver, a horizontal synchronizing signal 719, a vertical synchronizing signal 720, and a clock signal 721 for the X driver from the detected display data and various timings, and supplies them to the liquid crystal display. Perform feed display.

  Since the demodulator 712 uses the carrier wave generated by the PLL 715 based on the same frequency oscillated by the carrier wave oscillator 706 of the modulator 707, an error due to the accuracy of the carrier frequency does not occur. Further, the timing for synchronous detection and the timing for despreading of the demodulator 712 can be generated based on the horizontal synchronization signal 723 transmitted by wire as the second category information. This eliminates the need for a circuit for acquisition of synchronization on the receiving side, and simplifies the circuit. In particular, in the case of code multiplexing, it is possible to use a correlator instead of a matched filter as a despreading circuit.

  As is well known, the circuit of the matched filter is complicated in despreading, but in this embodiment, the response time is short and synchronization is not necessary. On the other hand, when the correlator is used for despreading, despreading cannot be performed unless synchronization is achieved. Normally, sliding is performed one chip at a time, and trial and error calculations are performed. Cannot spread. However, according to the above configuration according to the present embodiment, the synchronization information of the correlator is sent as the second category information by wire, so there is no need to perform synchronization acquisition or sliding, and despreading can be performed with a very simple circuit. It becomes possible.

  According to the above configuration, signals can be multiplexed and transmitted / received without performing parallel / serial conversion of data, and this has the same effect as routing many bus lines in parallel. In particular, multiplexing by orthogonal codes is less restricted and does not require physical space like a bus line. It is also possible to provide a plurality of transmission units and reception units, and simultaneously communicate in several different places where signal transmission / reception is necessary. In addition, it is possible to earn a diffusion gain by diffusion, and in particular, in an apparatus that generates radio waves such as a mobile phone, it is effective in improving anti-interference and interference characteristics with the intended radio waves. In addition, since synchronization information and carrier frequency information are transmitted as the second category information by wire, it is easy to match the carrier frequency between transmission and reception, and the accuracy of the carrier wave oscillator 706 is not required. The synchronization acquisition for despreading is also unnecessary, and the despreading circuit 714 can be greatly simplified, which is highly feasible.

FIG. 11 is a block diagram showing the main part of an embodiment of the data transmission and electronic device according to the present invention.
In FIG. 11, the functions of the CPU 801, video memory 802, and liquid crystal controller 803 are the same as those described in the fifth and sixth embodiments. The display data 825, horizontal synchronization signal 823, and vertical synchronization signal 824 generated by the liquid crystal controller 803 are rearranged and rearranged by the logic circuit 804, such as preamble assignment and packet construction, and converted to a serial signal. The The primary modulator 805 modulates the pulse train generated by the pulse generator 806 to this signal. For the primary modulation, pulse position modulation, biphase pulse modulation, or the like can be used for the pulse train. The signal subjected to the primary modulation is spread and modulated by the spread modulator 807 with the spread code generated by the spread code generator 808.

  The pulse train subjected to the spread modulation is subjected to waveform shaping into a very short time pulse so as to become a broadband pulse having a low spectral density by the pulse shaping circuit 809, and then radiated as an electromagnetic wave by the transmitting antenna 810. The radiated electromagnetic field is not a sine wave modulated but a very thin pulse train. Such communication using short pulses and wide-band pulses is called an impulse radio or UWB communication system.

The emitted electromagnetic wave is received by the receiving antenna 811 through the radio propagation path 826, amplified by the preamplifier 812 as necessary, and then correlated with the pulse template generated by the pulse generator 813 by the correlator 814. Is done. The output of the correlator 814 is despread by the despreading circuit 815 by the spreading code generated by the spreading code generator 816, demodulated by the demodulator 817, and converted to a signal before the primary modulation (input of the primary modulator 805). Is done.
The logic circuit 818 is a display for driving the liquid crystal driver based on the display data detected by the demodulator 817 and the horizontal synchronizing signal 823 sent through the wired path 827 as the second category information from the transmission side. A data signal 819, a horizontal synchronizing signal 820, a vertical synchronizing signal 821, and an X clock signal 822 of the X driver are generated and sent to the liquid crystal display for display.
When there is such reference timing information on the receiving side, the configurations of the correlator 814 and the logic circuit 818 are greatly simplified as compared to the case where there is no reference timing information.

  Here, the essence of UWB communication is to use short pulses with extremely low spectral density. When UWB is used, the legal upper limit of radiant energy is allowed to the level of unnecessary radiation regulated by EMI, and is much looser (about 20 dB) than the upper limit of radio stations that do not require a license. For this reason, even in an electronic apparatus that generates a strong radio wave, which is the original purpose, such as a mobile phone, it is easy to set a link budget that can ensure sufficient communication quality. Since the pulse to be used can have a narrow pulse width and a high peak value, the preamplifier 812 can be omitted.

  In the case of an electronic device having UWB as a short-range communication interface, if this embodiment is applied to data transmission within the electronic device, there is a possibility that they interfere with each other and cause serious interference. This can be avoided by synchronizing the windows, performing frequency hopping, and synchronizing the hopping sequence. In this case, the synchronization information in this case may be applied as the second category information.

  According to the above configuration, the modulation operation is performed only on the time axis, and most of the components can be realized only by a digital circuit that handles pulses, and the circuit elements can be easily integrated into an IC. By adopting short pulses, gain of spreading gain in the time direction can be gained, and not only the resistance to interference and interference characteristics with radio waves emitted as an original function of electronic devices can be improved, but also multi-channel as a communication transmission path can be achieved. it can.

FIG. 12 is a diagram showing a block diagram of a main part of another embodiment of the electronic apparatus according to the present invention, and shows an example in which the information transmission method according to the present invention is applied to an electronic apparatus using an image sensor.
In FIG. 12, an image sensor 901 is activated by a horizontal synchronization signal 920 and a vertical synchronization signal 921 generated from the control circuit 902, and outputs captured image data 919. The logic circuit 903 receives these signals and constructs a packet for wireless transmission. The packet modulates the carrier wave generated by the carrier wave oscillator 906 by the modulator 905 and is radiated from the transmitting antenna 907 as an electromagnetic wave.

  An electromagnetic wave signal transmitted from the transmission antenna 907 propagates through a wireless propagation path (space) 922, is received by the reception antenna 908, is amplified by the preamplifier 909, and an unnecessary out-of-band signal is removed by the band-pass filter 910 and demodulated. Input to the device 912. The PLL 915 divides the carrier wave output from the carrier wave oscillator 906 by the frequency divider 904 and multiplies the frequency divider 904 output sent through the wired path 923 as the second category information to the carrier frequency to generate the carrier wave. And input to the demodulator 912. The demodulator 912 also demodulates the received signal using the synchronization timing necessary for demodulation from the signal from the control circuit 902 transmitted through the wired path 923 as the second category information. The serial / parallel conversion circuit 914 extracts an image data portion from the demodulated reception packet, performs serial / parallel conversion for each pixel, and generates pixel data.

The logic circuit 916 generates a memory address for writing to the video memory 917 in accordance with the demodulated pixel data, and writes image data to the address of the video memory 917 directly or via the CPU 918. The CPU 918 accesses the video memory 917 and uses the image data for various applications.
Normally, the CPU 918 performs control such as activation of the image sensor 901. However, since the bit rate is low in the method of transmitting information related to the activation to the control circuit 902 of the image sensor 901, it is preferable to transmit the information as the second category information by wire. However, wireless transmission is also possible. In that case, both the CPU 918 side and the image sensor 901 side have transmission / reception means to perform bidirectional communication. In particular, in a clamshell mobile phone, the image sensor 901 and the display element are placed close to each other and are often on the side opposite to the CPU 918 side, and the captured image data is sent to the CPU 918 side for processing. Then, it is sent back to the display element side. Such a case can be realized by adopting a configuration in which Example 5 or Example 6 is placed back to back.

  The above configuration, that is, wireless transmission of data from the image sensor 901 has become more obvious with the increase in size of the image sensor 901, such as increased power consumption, wiring position restrictions, EMI problems, reliability degradation, etc. Various problems caused by transmission can be eliminated. On the receiving side, since the synchronization timing necessary for demodulation is transmitted by wire, there is no need to acquire synchronization, and the circuit can be simplified greatly. In addition, since the carrier wave generated by the same oscillation source is used as a reference between transmission and reception, the frequency accuracy required for the carrier wave oscillator 906 is remarkably relaxed, which has a great effect on cost reduction and feasibility.

FIG. 13 is a diagram illustrating another embodiment of an electronic device using the information transmission method according to the present invention, which is an example used for data transmission between semiconductor chips.
In FIG. 13, the semiconductor chip 1012 has a circuit element 1001 having (generating) a plurality of data to be transmitted in the semiconductor chip 1012, and the semiconductor chip 1013 has a circuit for receiving the data in the semiconductor chip 1012. There is an element 1005. The semiconductor chips 1012, 1013 are provided with control circuits 1003, 1006 that communicate with each other via a wired path 1014, respectively, and a transmission antenna 1010 and a reception antenna 1011 that communicate with each other via a wireless propagation path 1015. Each is provided. Data transmission is performed from the semiconductor chip 1012 toward the semiconductor chip 1013.

  The control circuit 1003 is activated so that the circuit element 1001 outputs data to be transmitted, and the multiplexing circuit 1002 receives and multiplexes the transmission data from the circuit element 1001. Multiplexing uses parallel-serial conversion as described in the fifth or sixth embodiment and code multiplexing as in the ninth embodiment. The modulator 1004 receives the output of the multiplexing circuit 1002, modulates it, and transmits it as an electromagnetic wave signal by the transmitting antenna 1010. The control circuit 1003 simultaneously generates multiplexing, synchronization of synchronization, and other timing signals and carrier waves. In addition, signals that serve as a reference for the carrier wave are generated using the methods described in the fifth to eleventh embodiments, and these signals are transmitted to the control circuit 1006 on the reception side through the wired path 1014.

  The signal propagated through the space (wireless propagation path) 1015 and received by the receiving antenna 1011 is restored to the original signal demodulated by the demodulator 1008 and multiplexed by the demultiplexing circuit 1007, and received by the circuit element 1005 that receives the signal. Sent. The control circuit 1006 receives a multiplexed signal, a modulation synchronization signal, other timing signals, and a carrier wave reference signal from the transmission side control circuit 1003, synchronizes demodulation and demultiplexing, and restores the carrier wave used by the demodulator 1008. To do. By receiving these signals, the demultiplexing and demodulation circuits can be greatly simplified, and the demand for the accuracy of the oscillation frequency is greatly eased.

The transmission / reception antennas 1010 and 1011 may be formed on the semiconductor chips 1012, 1013, or a signal may be taken out of the chip via a bonding pad and the antenna may be externally attached.
By adopting such a configuration as described above, the number of pins of the semiconductor chip can be greatly reduced, and a significant amount of power can be obtained compared to the conventional method of driving together with the stray capacitance in order to extract a logic level signal through the bonding pad. Reduction is possible.

FIG. 14 is a diagram illustrating still another embodiment of the electronic apparatus using the information transmission method according to the present invention, which is an example applied to a home theater.
In FIG. 14, the home theater includes an image display unit 1305, a tuner decoder unit 1301, and a speaker unit 1324. The image display unit 1305 includes an image display device and receives and displays an image signal. In addition, the speaker unit 1324 receives a sound signal for each of a plurality of speakers 1311, 1312, 1313, 1314, and 1315 and each of the speakers 1311, 1312, 1313, 1314, and 1315 to control and amplify an acoustic effect. It is comprised from the drive part which drives 1312, 1313, 1314, 1315. The following method is used for connection between them.

The reproduction unit 1302 of the tuner decoder unit 1301 extracts image and audio data from an image and audio source such as a TV tuner or a DVD recorder in response to an instruction from the control circuit 1320.
Data output from the reproduction unit 1302 is multiplexed for each image and audio channel by the multiplexing circuit 1303. Multiplexing is performed by multiplying the spreading code generated by the spreading code generator 1321 for each channel in synchronism with the reference signal generated by the control circuit 1320 and analogly adding the multiplication results. The multiplexed data is modulated by the modulator 1309 and transmitted from the transmission antenna 1317 as the first category information. The carrier oscillator 1304 multiplies based on the reference signal generated by the control circuit 1320 to generate a carrier wave. The reference signal generated by the control circuit 1320 is transmitted to the image display unit 1305 and the speaker unit 1324 through the wired path 1316 as second category information. The image data, text data, or audio data propagates through the wireless propagation path 1319 as the first category information, is received by the receiving antenna 1318, demodulated by the demodulator 1307, despread by the despreading circuit 1308, and demultiplexed to obtain the image signal. Only, and the extracted image data is stored in the display memory circuit 1310. The image data stored in the display storage circuit 1310 is sequentially read and displayed on the screen of the image display device built in the image display unit 1305.

Similarly, information sent to the speaker unit 1324 is also replicated with the same configuration as that inside the image display unit 1305. The description is redundant and will not be described in further detail.
Here, the carrier wave for demodulation is multiplied by the control circuit 1323 based on the reference signal that is wire-transmitted as the second category information, and the carrier wave oscillator 1306 oscillates. The spreading code generator 1322 used for despreading generates a spreading code in synchronization with the reference signal sent as the second category information by the control circuit. By adopting such a configuration, the carrier wave is always tracked in both transmission and reception, so that the carrier wave oscillator having high frequency accuracy required is not required. Also, since the despreading code can be synchronized, the despreading circuit can be remarkably simplified.

  By adopting the above configuration, conventionally, the tuner decoder unit 1301 requires a star-shaped wiring to the speaker unit 1324 and the image display unit 1305, and has taken a complicated protocol for parallel conversion and high-speed transmission. Is significantly simplified. In addition, even when all signals are transmitted wirelessly, the circuit and protocol are remarkably simplified and the practical effect is great.

FIG. 15 is a conceptual diagram showing the main part of still another embodiment of the information transmission system according to the present invention.
In FIG. 15, it is assumed that data is transmitted from the transmission unit block 2112 to the reception unit block 2113. Here, the transmission unit block 2112 is provided with a transmission circuit 2101 having information to be transmitted, and the reception unit block 2113 is provided with a reception circuit 2104 for receiving the transmission information.

  The transmission information emitted from the transmission block 2112 is categorized into first category information and second category information. The first category information is modulated by the modulator 2102 and transmitted as an electromagnetic wave from the transmission antenna 2110. The second category information is superimposed on the power supply line 2107 via the interface circuit 2103 and transmitted along with the power supply by wire. An electromagnetic wave signal transmitted from the transmitting antenna 2110 and carrying the first category information propagating through the space (wireless propagation path 2108) is received by the receiving antenna 2111, demodulated by the demodulator 2106, and output to the circuit 2104. The second category information superimposed on the power supply line and transmitted by wire is transmitted to the circuit 2104 via the interface circuit 2105. The second category information may be transmitted from the reception block 2113 to the transmission unit block 2112. In this case, the second category information is transmitted from the interface circuit 2105 to the interface circuit 2103.

  Here, the second category information includes information that does not require high-speed mass data transfer, synchronization information for wireless transmission / reception, oscillator information, feedback information for feedback of data reception status, encryption information for security enhancement, and the like. Information that is conceivable and issued by the interface circuit 2103 or the interface circuit 2105 itself can also be included in this second category information. The interface circuit 2103 also collects the second category information generated by the transmission circuit 2101 and finally sends it out as the second category information together with the second category information generated by itself.

  In particular, if the synchronization information of the communication packet can be acquired regardless of the radio propagation path 2108, a circuit for extracting the synchronization information on the receiving side becomes unnecessary, and the circuit on the receiving side can be significantly simplified. Also, the correlator structure can be greatly simplified by sending the correlator synchronization information necessary for spread spectrum and UWB communications. Furthermore, if the oscillator information can be transmitted, a clock signal that is a reference between transmission and reception can be made common, and the oscillation frequency accuracy required for the oscillator is remarkably eased, and the electronic device can be easily realized. In the case of an electronic device having a short-range communication interface such as a mobile phone or Bluetooth or UWB, when the electromagnetic wave that transmits the first category information may interfere with the original communication of the electronic device, By exchanging the operation status of the electronic device between the transmission and reception of the first category information as the second category information so as not to interfere with the radio wave used, the frequency of the electromagnetic wave transmitting the first category information is changed, Interference with communication can be eliminated. That is, as the second category information, the frequency of the transmission channel can be selected for a mobile phone or the like, and the hopping pattern or the like can be selected for Bluetooth or UWB. These signals can be generated from the interface circuit 2103 or the interface circuit 2105.

  The second category information is superimposed on the power supply line 2107 together with the power supply, and is transmitted / received between the transmission block 2112 and the reception block 2113. The power supply 2116 supplies power to all the circuits in the transmission block 2112, and the second category information generated by the interface circuit 2103 is superimposed on the power supply line 2107 by the superimposing circuit 2115. Details of the inside of the superimposing circuit 2115 will be described within a dashed line 2117. Terminal 2128 is connected to power supply 2116, and terminal 2129 is connected to power supply line 2107. Second category information emitted from the interface circuit 2103 is superimposed on the power supply line 2107 through the high pass filter 2124 from the terminal 2125. The signal of the second category information superimposed by the low pass filter 2127 does not leak to the terminal 2128 side, and therefore all the circuits of the transmission block 2112 operate correctly. The second category information superimposed on the power supply line 2107 is separated by the separation circuit 2114 and transmitted to the interface circuit 2105.

  The inside of the separation circuit 2114 will be described in detail within a one-dot chain line 2118. The terminal 2121 is connected to the power supply line 2107. The signal of the second category information entering the terminal 2121 is separated by the high pass filter 2123 and transmitted to the interface circuit 2105 from the terminal 2120. In order to prevent the leakage of the second category information, the low-pass filter 2122 transmits only energy supplied from the power source 2112 from the terminal 2119, and supplies power correctly to all circuits in the receiving block through the terminal 2119. When the second category information is sent from the reception block 2113 side to the transmission block 2112 side, the functions of the superimposing circuit 2112 and the separation circuit 2114 are reversed, but the same circuit configuration may be used as shown in FIG.

  By adopting such a configuration, the second category information for significantly simplifying the transmitter / receiver modulator 2102 and demodulator 2106 can be transmitted superimposed on the power supply line 2107, so that the minimum number of wires in the electronic device can be provided. Signals can be exchanged, and a highly reliable electronic device can be realized by a simple method.

FIG. 16 is a diagram showing still another embodiment of the electronic apparatus according to the invention.
In FIG. 16, the electronic device is divided into a main body portion 2205 and a display portion 2212, which are integrated via a hinge 2207. Here, the power supply 2213 is in the main body 2205, and in the main body 2205, the power supply voltage is supplied to each electronic circuit in the main body through wiring on the substrate, and the second category information is superimposed on the power supply voltage by the superimposing circuit 2214. Then, it is sent to the display portion 2212 through the electric wire 2211. The separation circuit 2215 separates the superimposed power supply voltage and the second category information, and the power supply voltage is distributed to each circuit of the display portion 2212 through wiring on the substrate of the display portion 2212.

  Display data generated by the liquid crystal controller 2208 is transmitted to the modulator 2200 as first category information, modulated, converted into electromagnetic waves (radio waves) from the transmission antenna 2209, and propagates through space. The electromagnetic wave signal transmitted from the transmission antenna 2209 is received by the reception antenna 2210, demodulated into display data by the demodulator 2202, sent to the liquid crystal driver 2201, and displayed on the liquid crystal display 2206.

  The synchronization signals of the modulator 2200 and the demodulator 2202 are superimposed on the power supply line 2211 by the superimposing circuit 2214 as second category information, sent to the separation circuit 2215 through the power supply line 2211, and the separation circuit 2215 receives the second category from the power supply. Information is separated and transmitted to the demodulator 2202. Since this signal does not have a very high data rate and the number of necessary signal lines is small, it is easy to overlap the power supply line 2211 and route it through the hinge 2207. As a result, the degree of freedom of wiring and component arrangement is increased, and the modulator 2200 and the transmission antenna 2209 as the signal transmission unit and the demodulator 2202 and the reception antenna 2210 as the reception unit are located far from the hinge 2207 as shown in FIG. It is also possible to arrange.

  As data to be transmitted increases in speed, it becomes difficult to transmit data in the transmission line, but transmission by electromagnetic waves in the space becomes easier. Thus, if a control signal such as synchronization is sent through a wired path and the modem is synchronized, synchronization detection for synchronization on the demodulator side becomes unnecessary, and the circuit can be simplified. Moreover, since the wired path is shared with the power supply line 2211, the number of wirings can be reduced. With the recent improvement in semiconductor device manufacturing technology, it is possible to simplify the high-frequency wireless transmission modem in this way and incorporate it into an electronic device at a low cost, and it is highly practical.

FIG. 17 is a block diagram showing a more detailed configuration of the information transmission method according to the present invention and another embodiment of an electronic apparatus using the information transmission method.
In FIG. 17, the CPU 2301 generates display data to be displayed by calculation or the like and records it in the video memory 2302. The liquid crystal controller 2303 reads data 2319 to be displayed on the display body from the video memory 2302 in a predetermined order, and outputs the data 2319 together with the vertical synchronization signal 2321 and the horizontal synchronization signal 2320. Since the data 2319 to be displayed is read out as data in parallel for each word in units of pixels from the normal video memory, the data 2319 is parallel-to-parallel converted by the parallel-to-serial conversion circuit 2304 and transmitted to the logic circuit 2307. The logic circuit 2307 receives the signal output from the parallel-to-serial conversion circuit 2304, the horizontal synchronization signal 2320, and the vertical synchronization signal 2321, generates a packet, sends the packet to the modulator 2308 as first category information, and a reference representing the head of the packet The signal 2306 is output as second category information to the PLL 2309 and the superimposing circuit 2326. The first category information generates a carrier wave synchronized with the reference signal by multiplying the reference signal 2306 by the PLL 2309. This carrier wave is modulated by the modulator 2308 and transmitted from the transmission antenna 2310. At the same time, the reference signal 2306 is superimposed as the second category information on the power supply line 2330 by the superimposing circuit 2326 and transmitted to the separating circuit 2327 on the receiving side.

  The reception antenna 2311 receives the electromagnetic wave signal transmitted from the transmission antenna 2310. Then, the signal received by the receiving antenna 2311 is amplified by the preamplifier 2312, and then an unnecessary band component is removed by the band pass filter 2313 and input to the demodulator 2314. Further, the reference signal superimposed and transmitted to the power line 2330 as the second category information is separated by the separation circuit 2327, multiplied by the PLL 2315 based on this output, the carrier wave is restored and supplied to the demodulator 2314, Demodulate the electromagnetic wave signal. The logic circuit 2316 detects the head of the packet from the reference signal separated by the separation circuit 2327 and generates display data 2322 in the packet, a horizontal synchronization signal 2323, a vertical synchronization signal 2324, and an X driver transfer clock 2325 from the packet. The data is output to the driver of the liquid crystal display body 2318 and displayed.

The oscillation frequencies of the PLLs 2309 and 2315 are selected so as not to interfere with the original purpose of an electronic device that uses radio waves such as radio receivers and mobile phones. If a frequency of 2 GHz or higher is selected, the occupied band is about 200 MHz even if data of 100 Mbps is transmitted, and can usually be used without problems in most cases.
In general, in the wireless communication, the transmission side modulator 2308 and the reception side demodulator 2314 need to have the same carrier frequency, and the carrier oscillator frequency between transmission and reception is required to have high accuracy. The error between the two appears as direct communication quality degradation. However, according to the configuration of the present invention described above, the modulator 2308 and the demodulator 2314 use the same reference signal 2306, and the reference signal 2306 is multiplied by the PLLs 2309 and 2315 to generate the carrier wave. It matches and does not become an error. For this reason, the accuracy of the carrier wave oscillator is not a problem and has a cost reduction effect. Instead of the reference signal 2306, the PLL 2309 output may be directly superimposed on the power supply line 2330 by the superimposing circuit 2326 and transmitted. In this case, the carrier wave separated by the separation circuit 2327 can be directly input to the demodulator 2314 without using the PLL 2315, and the PLL 2315 is unnecessary. However, since the carrier frequency is generally high, it is difficult to transmit the wired path. As in the above configuration, it is more feasible to generate a carrier wave by multiplying by using PLL 2309 and 2315 having the same characteristics in both transmission and reception using a reference signal having a low frequency.

  The reference signal 2306 is a signal representing the head of the packet for sending the first category information. Since this reference signal is sent as the second category information superimposed on the power supply line 2330, the packet is easily received on the receiving side. Can be detected. Therefore, a circuit for extracting data from the packet becomes very simple, and it is not necessary to add a preamble that represents the head of the packet, the structure of the packet can be remarkably simplified, and the effective communication rate can be increased.

By adopting the above configuration, it is possible to wirelessly transmit a large amount of high-speed display data sent to the liquid crystal display body 2318, which has become more apparent as the liquid crystal display body 2318 increases in size, and increases in power consumption and wiring position. Various problems caused by wired transmission such as restrictions, EMI problems, and reliability degradation can be eliminated.
In addition, since the second category information is superimposed on the power supply line 2330, no special wiring for the second category information is required. In implementing the electronic device, the effect on mounting is also great.

  FIG. 18A is a block diagram showing the main part of still another embodiment of the electronic apparatus according to the present invention, and is a diagram illustrating the modulator 2308 and the demodulator 2314 of the embodiment 16 in more detail. The PLL 2402 corresponds to the PLL 2309 of the sixteenth embodiment, and is an oscillator that multiplies the reference signal generated by the control circuit 2407 and generates a rectangular pulse carrier wave synchronized with the reference signal. The multiplier 2401 multiplies the PLL 2402 and the input data 2403, outputs it as a transmission signal 2404, and sends it to the transmission antenna. The multiplier 2401 may be an exclusive OR circuit because both the input data 2403 and the output of the PLL 2402 are digital signals. When an analog value of value 1 is associated with logic 0 and an analog value of value -1 is associated with logic 1, the input / output of the exclusive OR circuit acts just as a multiplier. In addition, since the communication distance is extremely close, harmonic interference and the like that are given to other devices are originally kept low, and a filter or the like is not required between the antenna and the modulator output.

  The demodulator operates as follows. After the reception signal received by the reception antenna 2311 of FIG. 17 is amplified and unnecessary bands are removed, it is input to the multiplier 2405 as the reception signal 2407, multiplied by the carrier clock signal regenerated by the PLL 2408, and then the low-pass filter At 2406, the high frequency component is removed and the demodulated signal 2409 is demodulated. The low pass filter 2406 removes a high frequency component (a thin pulse component generated by a slight phase shift difference between the received signal 2407 and the reproduced clock waveform of the PLL 2408) from the output of the multiplier 2405, and outputs it as a demodulated signal 2409. The PLL 2408 multiplies the reference signal generated by the control circuit 2407 that is superimposed and transmitted on the power supply line as the second category information, and reproduces a carrier wave pulse whose phase is synchronized at the same frequency as the PLL 2402. In FIG. 18A, the superimposing circuit and the separation circuit are omitted, but it goes without saying that they are actually inserted between the control circuit 2407 and the PLL 2408.

  9A to 9C show time charts of the modulator described above. 10A shows a carrier clock signal generated by the transmission side PLL, that is, PLL 2402, FIG. 10B shows transmission data 2403, and FIG. 9C shows an output transmission signal 2404. If the time diagram of FIG. 5 is viewed as a digital circuit, the modulator is an exclusive OR, and if viewed as an analog value taking a value of ± 1, the modulator is a multiplier.

  9D to 9F show time charts of the demodulation circuit. That is, (d) is a received signal 2407, (e) is a pulse train generated from the PLL on the receiving side, that is, PLL 2408, (f) is the output of the multiplier 2405, and the low-pass filter 2406 receives the received signal from this signal. A high frequency component generated by a slight phase difference between 2407 and the PLL 2408 output is removed, and the demodulated signal 2409 is restored.

  As is clear from the figure, the carrier wave clock on the transmitting side (FIG. 9 (a)) and the regenerated carrier clock on the receiving side (FIG. 9 (e)) are demodulated if the frequency is different or the phase is shifted. Does not work well. In conventional wireless communication, errors are minimized by performing tracking using a high-precision oscillator separately on the transmitting side and the receiving side. According to this configuration of the present embodiment, generation of carrier waves on the transmission side and reception side is performed by the PLLs 2402 and 2408 having the same characteristics with reference to the reference signal generated by the control circuit 2407 on the transmission side. Can be secured. Therefore, there is no error due to the stability of the oscillation frequency and the frequency accuracy. In addition, an extremely stable circuit can be constructed even with an inexpensive circuit.

  In addition, since the radio signal transmission used in the present invention has a short communication distance and can secure communication quality with a sufficiently high SN ratio, the signal can be amplified to a level that can be regarded as a digital value. In this case, the amplified signal level increases to the logical value level, but the load driven by the logical value is not a long distance with a large stray capacitance such as from the CPU to the display body, but in the same semiconductor chip. Therefore, the power consumption is not increased because the load is extremely short. Even if the received signal is an analog level that is not amplified to a logical value level, the PLL 2408 output is a rectangle (with a value of ± 1), so that multiplication can be realized with a simple switch circuit. That is, two amplifiers having the same absolute value of the amplification degree and opposite in polarity are prepared. When the logic level 1 of the PLL 2408 output is selected, the inverting amplifier output of the received signal 407 is selected by the switch. Multiplication can be realized by selecting. A circuit having such a structure may be used as the multiplier 2405.

  According to the above configuration, the modulator can be realized very simply by an exclusive OR circuit, and the demodulator can be realized by one exclusive OR circuit or an amplifier and a switch circuit having positive and negative amplification degrees, and a low-pass filter.

FIG. 18B is a block diagram of a main part of another embodiment of the electronic device according to the present invention, and is a diagram illustrating in more detail another example of the modulator 2308 and the demodulator 2314 of the sixteenth embodiment. It is. In the seventeenth embodiment, simplified BPSK modulation is taken as an example, but in the eighteenth embodiment, an example based on QPSK is given to show a case where more general phase modulation is used.
A PLL 2413 corresponds to the PLL 2309 according to the sixteenth embodiment, and is a rectangular pulse oscillator that multiplies the reference signal generated by the control circuit 2417 and generates a carrier wave synchronized with the reference signal.

FIGS. 9G to 9J are time charts showing the operation of each part of the modulator shown in FIG.
Bit 1 (FIG. 9 (h)) and bit 2 (FIG. 9 (i)) of the transmission data are encoded by the encoder 2412, and the carrier wave (FIG. 9 (g)) oscillated by the transmission side PLL, that is, the PLL 2413, is phase-shifted. Whether the phase shift of 90 ° is performed by the signal 2414 and whether the carrier is inverted (the phase shift of 180 °) is controlled by the multiplier 2415, and finally the transmission signal 2415 (FIG. 9 (j) )) Is output.

  The control circuit 2417 corresponds to the logic circuit 2307 of the sixteenth embodiment, and the reference signal generated by the control circuit 2417 is superimposed on the power supply voltage as the second category information and transmitted also to the reception side. In FIG. 18B, the superimposing circuit and the separation circuit are omitted, but it goes without saying that they are actually inserted between the control circuit 2407 and the PLL 2408. The PLL 2420 corresponds to the PLL 2315 of the sixteenth embodiment, and multiplies the reference signal transmitted by being superimposed on the power supply line 2330 of FIG. 17, and generates a reproduction clock, that is, a reception side carrier wave (FIG. 9 (l)). The recovered clock output from the PLL 2420 is multiplied by the received signal 2418 (FIG. 9 (k)) by the first multiplier 2419, transmitted to the first low-pass filter 2423, and the high frequency component is removed and transmitted to the discrimination circuit 2425. It is done. At the same time, the received signal 2418 is multiplied by a pulse train (FIG. 9 (o)) obtained by shifting the recovered clock pulse train generated by the PLL 2420 by 90 ° by the 90 ° phase shifter 2422 by the second multiplier 2421, and the second low-pass filter. The high frequency component is removed by 2424 and transmitted to the discrimination circuit 2425. The discriminating circuit 2425 demodulates the received signal by determining transmission data from the outputs (FIG. 9 (n) and (q)) of the first and second low-pass filters 2423 and 2424.

  According to the above configuration, the speed of data transmission can be increased without increasing the occupied band of the transmission signal. In addition, since the modem can be realized by a simple digital circuit, it can be incorporated in a semiconductor chip, and an increase in cost and power consumption can be ignored. The carrier wave clock required for transmission and reception is obtained by multiplying the reference signal generated from the same control circuit 2417 for transmission and reception by PLLs 2413 and 2420 having the same characteristics to obtain the same frequency with the same phase. No error due to clock frequency accuracy. Stable data transmission is possible even with an inexpensive oscillator. Even if the control circuit 2417 changes the frequency of the reference signal unilaterally, the transmission side and the reception side always follow, so in an electronic device such as a radio communication device, the communication channel is not disturbed according to the communication channel. Such a frequency can be selected and changed unilaterally on the transmission side. (This is the same in any of the above embodiments 16 and 17.) If this property is used well, it is possible to remarkably facilitate interference and interference countermeasures for the intended communication of the electronic device such as a communication device. Is possible.

FIG. 19 is a block diagram showing the main part of an embodiment of another information transmission method and electronic apparatus according to the present invention.
In FIG. 19, the functions of the CPU 2601, the video memory 2602, and the liquid crystal controller 2603 are the same as those described in Embodiment 16, and the display data 2625, horizontal synchronization signal 2623, and vertical synchronization signal 2624 generated by the liquid crystal controller 2603 are as follows. The code is multiplexed by the code multiplexing circuit 2604 with the spreading code generated by the spreading code generator 2605. In this embodiment, since parallel data is code-multiplexed as follows, parallel / serial conversion by the parallel / serial conversion circuit 2304 of the sixteenth embodiment is unnecessary, and therefore, the inverse conversion, that is, the serial / parallel conversion circuit 2317 is also unnecessary. . As spreading codes, code sets that are orthogonal to each other are often used. The spreading code is generated by synchronizing the head of the code with the horizontal synchronizing signal 2623 generated by the liquid crystal controller 2603. Further, since the spreading code generator 2605 uses a signal obtained by multiplying the horizontal synchronizing signal 2623 by the PLL 2606, the carrier wave and the spreading code are completely synchronized.

  Since the display data 2625 is read from the video memory 2602 for each pixel, it is output as parallel digital data. Each bit of the data signal, the horizontal synchronizing signal 2623 and the vertical synchronizing signal 2624 are multiplied by each code generated by the spreading code generator 2605 (or exclusive ORed), added in analog, and code-multiplexed. . The multiplexed signal is modulated with a carrier wave generated by the PLL 2606 by the modulator 2607, and is transmitted through the radio propagation path 2626 (space) by the electromagnetic wave signal as the first category information from the transmitting antenna 2608. Since the carrier wave is generated by multiplying the horizontal synchronizing signal 2623 by the PLL 2606, the carrier wave is completely synchronized with the horizontal synchronizing signal 2623. Further, as described above, the horizontal synchronization signal 2623 is also synchronized with the spreading code generator 2605. The horizontal synchronizing signal 2623 is also superimposed on the power line 2627 by the superimposing circuit 2613 as the second category information, and is transmitted to the separating circuit 2622 on the receiving side.

  The transmitted electromagnetic wave signal is received by the receiving antenna 2609, amplified by the preamplifier 2610, unnecessary signals other than the predetermined band are removed by the band pass filter 2611, and then demodulated by the demodulator 2612. The PLL 2615 separates the horizontal synchronization signal 2623 that is superimposed on the power supply line 2627 as the second category information by the separation circuit 2622, and multiplies it based on this to generate the number of conveyances. The signal demodulated by the demodulator 2612 is sent to the despreading circuit 2614, where it is multiplexed by calculating the correlation with the spreading code for multiplexing generated by the spreading code generator 2616. Data is separated. The logic circuit 2617 performs waveform shaping and timing adjustment of the display data signal 2618 for driving the liquid crystal driver, the horizontal synchronization signal 2619, the vertical synchronization signal 2620, and the clock signal 2621 of the X driver from the detected display data and various timings. Then, it is sent to the liquid crystal display body as a drive signal for the liquid crystal display body and displayed.

  The carrier waves of the demodulator 2612 and the modulator 2607 are synchronized with the horizontal synchronization signal 2623 that is the same reference signal, and are oscillated by the PLL 2606 and the PLL 2615 having the same characteristics. Does not cause errors. In addition, since the head of the spreading code coincides with the horizontal synchronization signal on both the transmission side and the reception side, it is not necessary to detect the timing for despreading. This eliminates the need for a circuit for acquisition of synchronization on the receiving side, and simplifies the circuit. In particular, in the case of code multiplexing, it is possible to use a correlator instead of a matched filter as a despreading circuit. In addition, since the synchronization information of the correlator is sent as the second category information by wire, it is not necessary to perform synchronization acquisition or sliding, and despreading can be performed with a very simple circuit.

  Further, since the horizontal synchronizing signal 2623 and the vertical synchronizing signal 2624 are also code-multiplexed and transmitted together with the display data 2625, the receiving side can immediately detect the synchronizing signal for displaying them by despreading. Since the horizontal synchronization signal 2623 is also superimposed on the power supply line 2627 as the second category information and transmitted, this signal may be used as the horizontal synchronization signal 2619 without code multiplexing. Further, in order to increase the spreading gain, a spreading code having a sufficiently wide frequency band may be selected, and spreading modulation may be further performed after the modulator 2607.

FIG. 20 is a block diagram showing the main part of still another embodiment of the electronic apparatus according to the present invention, and shows an example in which the information transmission system according to the present invention is applied to an electronic apparatus using an image sensor.
In FIG. 20, an image sensor 2701 is activated by a horizontal synchronizing signal 2720 and a vertical synchronizing signal 2721 generated from the control circuit 2702 and outputs imaged image data 2719. The logic circuit 2703 receives these signals and constructs a packet for wireless transmission. The packet is modulated by the modulator 2705 and radiated from the transmitting antenna 2707 as an electromagnetic wave. The carrier wave used for the modulator 2705 is oscillated by multiplying the reference signal generated by the control circuit 2702 by the PLL 2706. As the reference signal, for example, a signal indicating the head of a packet constructed by the logic circuit 2703 by the control circuit 2702, a horizontal synchronization signal 2720 for activating the image sensor, or the like is used. This reference signal is superimposed on the power line 2723 as the second category signal by the superimposing circuit 2704 and sent to the separating circuit 2711 on the receiving side.

  An electromagnetic wave signal transmitted from the transmission antenna 2707 propagates through a wireless propagation path (space) 2722, is received by the reception antenna 2708, is amplified by the preamplifier 2709, and an unnecessary out-of-band signal is removed by the bandpass filter 2710. And input to the demodulator 2712. The PLL 2715 multiplies the reference signal extracted from the power line 2723 by the separation circuit 2711 as the second category information, and generates a carrier wave. The demodulator 2712 also demodulates the received signal using the synchronization timing necessary for demodulation from the reference signal from the control circuit 2702 transmitted through the wired path 2723 as the second category information. The serial / parallel conversion circuit 2714 extracts an image data portion from the demodulated reception packet, performs serial / parallel conversion for each pixel, and generates pixel data. Since these circuits can use the reference signal from the control circuit 2702 as the second category information, it is not necessary to detect a signal for synchronization, and the circuit configuration can be remarkably simplified. Further, since the carrier frequency is always synchronized with the transmission side and tracking is performed, the required accuracy is remarkably eased.

  The logic circuit 2716 generates a memory address for writing to the video memory 2717 according to the demodulated pixel data, and writes the image data to the address of the video memory 2717 directly or via the CPU 2718. The CPU 2718 accesses the video memory 2717 and uses the image data for various applications. Normally, the CPU 2718 performs control such as activation of the image pickup device 2701. In order to transmit information related to the activation to the control circuit 2702 of the image pickup device 2701, it is also possible to superimpose the information on the power supply line 2723 as a second category information. It can also be transmitted wirelessly.

  In the case of the wireless transmission, both the CPU 2718 side and the image sensor 2701 side have wireless transmission / reception means and perform bidirectional communication. In particular, in a mobile phone having a clamshell structure, the image sensor 2701 and the display element are placed close to each other and are often on the side opposite to the CPU 2718 side, and the captured image data is sent to the CPU 2718 side for processing. Then, it is sent back to the display element side. The second category information only needs to be on the side where the control circuit 2702 is placed, and by using the reference signal of the control circuit 2702 in common, both can be synchronized. On the receiving side, since the synchronization timing necessary for demodulation is superimposed on the power supply line 2723 and transmitted, there is no need to acquire synchronization, the number of wirings can be reduced, and the circuit can be greatly simplified.

FIG. 21 is a block diagram showing the main part of an embodiment of the data transmission and electronic device according to the present invention.
In FIG. 21, the functions of the CPU 2801, the video memory 2802, and the liquid crystal controller 2803 are the same as those described in the sixteenth and nineteenth embodiments. The display data 2825, horizontal synchronization signal 2823 and vertical synchronization signal 2824 generated by the liquid crystal controller 2803 are rearranged by the logic circuit 2804 and rearranged in data such as preamble assignment and packet construction, and converted to serial signals. The Primary modulator 2805 modulates the pulse train generated by pulse generator 2806 to this signal. For the primary modulation, pulse position modulation, biphase pulse modulation, or the like can be used for the pulse train.
The signal subjected to the primary modulation is spread and modulated by the spread modulator 2807 with the spread code generated by the spread code generator 2808.

The pulse train subjected to the spread modulation is subjected to waveform shaping into a very short time pulse so as to become a broadband pulse having a low spectral density by the pulse shaping circuit 2809 and then radiated as an electromagnetic wave by the transmitting antenna 2810. The radiated electromagnetic field is not a sine wave modulated but a very thin pulse train.
On the other hand, the horizontal synchronization signal 2823 also determines a reference for pulse generation for pulse modulation such as pulse position modulation. This signal is superimposed on the power supply line 2827 by the superimposing circuit 2828 as a reference signal of the second category information, and transmitted to the separating circuit 2829 on the receiving side.

  The radiated electromagnetic wave is received by the receiving antenna 2811 through the radio propagation path 2826, amplified by the preamplifier 2812 as necessary, and then the correlation with the pulse template generated by the pulse generator 2813 is calculated by the correlator 2814. Is done. The output of the correlator 2814 is despread by the despreading circuit 2815 by the spreading code generated by the spreading code generator 2816, demodulated by the demodulator 2817, and converted into a signal before the primary modulation (input of the primary modulator 2805). Converted. The logic circuit 2818 is a display for driving the liquid crystal driver based on the display data detected by the demodulator 2817 and the horizontal synchronization signal 2823 transmitted from the transmission side as the second category information superimposed on the power supply line 2827. A data signal 2819, a horizontal synchronizing signal 2820, a vertical synchronizing signal 2821 and an X driver X clock signal 2822 are generated and sent to the liquid crystal display for display.

  According to the above configuration, the modulation operation is performed only on the time axis, and most of the components can be realized only by a digital circuit that handles pulses, and the circuit elements can be easily integrated into an IC. Also, by adopting short pulses, the gain in the time direction is gained, not only improving the anti-interference and interference characteristics with radio waves emitted as an original function of the electronic device, but also multi-channeling as a communication transmission path be able to. On the receiving side, since the synchronization timing necessary for demodulation is superimposed on the power supply line 2827 and transmitted, there is no need to acquire synchronization, the number of wirings can be reduced, and the circuit can be greatly simplified.

  FIG. 22 is a diagram illustrating still another embodiment of the electronic apparatus according to the invention. The present embodiment exemplifies another method of superimposing the second category information on the power supply line in the above-described embodiments 14 to 21. Information having a high frequency such as a carrier wave as the second category information cannot basically be superimposed on the power line. The object of the present invention was to transmit wirelessly because such high frequency signals cannot be transmitted successfully. Conversely, even if the frequency of the second category information is too low, it cannot be superimposed on the power line. Even if it is possible to superimpose, separation on the receiving side is not performed well, or the voltage level of the power supply line fluctuates, which seriously affects device operation. When the frequency of the second category information is too low as described above, it is transmitted with modulation as shown in FIG.

  That is, the second category information input to the input terminal 2901 is modulated by the modulator 2903 and sent to the superimposing circuit 2904. The superimposing circuit 2904 can be easily configured with a high-pass filter and a low-pass filter, similarly to the superimposing circuit 2115 shown in FIG. A carrier wave input to the modulator 2903 is oscillated by a carrier wave oscillator 2902. The oscillation frequency can be superimposed on the power supply line 2905, and an appropriate frequency that does not affect the electronic device is selected. The carrier wave oscillator 2902 may be, for example, means for dividing a carrier wave for transmitting the first category information by electromagnetic waves.

  The superimposing circuit 2904 superimposes the second category information on the power supply voltage supplied from the power supply terminal 2911 and sends it to the power receiving end through the power supply line 2905. The separation circuit 2906 separates the second category information, outputs the second category information to the demodulator 2907, and supplies the power supply voltage from the terminal 2912 to each part of the reception unit. The demodulator 2907 demodulates the second category information. The demodulated second category information usually has a time delay due to demodulation, but this is corrected by the correction circuit 2909. The carrier wave oscillator 2908 generates a carrier wave for demodulation. However, when delay detection or the like is used, a carrier wave is not necessarily required for demodulation. In order to simplify the circuit, a demodulation method that can omit the carrier wave oscillator 908 may be selected.

  Such a circuit can be incorporated on a semiconductor chip as a result of advances in semiconductor technology, and can be realized with almost no increase in cost.

FIG. 23 is a diagram illustrating still another embodiment of an electronic device using the information transmission method according to the present invention, and is an example in which a power supply line is used for data transmission between semiconductor chips.
In FIG. 23, a semiconductor chip 3012 is provided with a transmission circuit 3001 having (generating) a plurality of data to be transmitted in the semiconductor chip 3012, and a reception circuit 3005 for receiving the data in the semiconductor chip 3012. ing. Then, data transmission is performed from the semiconductor chip 3012 toward the semiconductor chip 3013.

  The control circuit 3003 is activated so that the transmission circuit 3001 outputs data to be transmitted, and the multiplexing circuit 3002 receives the transmission data from the transmission circuit 3001 and multiplexes it. Multiplexing uses parallel-serial conversion as described in the sixteenth embodiment or code multiplexing as in the nineteenth embodiment. Modulator 3004 receives the output of multiplexing circuit 3002, modulates it, and transmits it as an electromagnetic wave signal by transmitting antenna 3010. The control circuit 3003 simultaneously generates multiplexing, synchronization of synchronization, other timing signals, and a carrier wave. In addition, signals serving as carrier wave references are also generated using the methods described in the sixteenth to twenty-first embodiments, and these signals pass through the power supply line 3014 by the superimposing circuit 3017 as second category information and are separated on the receiving side separation circuit 3016. Is transmitted.

  The separation circuit 3016 extracts the second category information from the power supply line 3014 and transmits it to the control circuit 3006. A signal that propagates through space (wireless propagation path) 3015 and is received by the receiving antenna 3011 is demodulated by the demodulator 3008, and the signal multiplexed by the demultiplexing circuit 3007 is restored to receive the signal. 3005. The control circuit 3006 receives the multiplexed signal, the modulation synchronization signal, other timing signals, and the carrier wave reference signal from the control circuit 3003 through the superimposing circuit 3017, the power supply line 3014, and the separation circuit 3016, and synchronizes demodulation and demultiplexing. Further, the carrier wave used in the demodulator 3008 is restored.

  By using the same reference signal for synchronization between the signal transmission side and the signal reception side in this way, the multiplexing, demultiplexing and modulation / demodulation circuits can be greatly simplified, and the oscillation frequency accuracy can be greatly reduced. The demands on the semiconductor chip 3012 and 3013 are all realizable. Further, when the superposition circuit and the separation circuit as in the twenty-second embodiment are used, data can be transmitted and received by the power line 3014 in a wide frequency range.

  FIG. 24 is a diagram illustrating still another embodiment of the electronic apparatus using the information transmission method according to the present invention, in which data transmission using a power line is applied to a home theater. The home theater includes an image display unit 3105, a tuner decoder unit 3101, and a speaker unit 3124. The image display unit 3105 includes an image display device and receives and displays an image signal. The speaker unit 3124 is usually composed of a plurality of speakers 3111, 3112, 3113, 3114, 3115 and a drive part that receives the audio signal for each speaker, controls and amplifies the acoustic effect, and drives the speaker.

  The following method is used for connection between them. That is, the reproduction unit 3102 of the tuner decoder unit 3101 extracts image and audio data from an image and audio source such as a TV tuner or a DVD recorder in response to an instruction from the control circuit 3120. Data output from the playback unit 3102 is multiplexed for each image and audio channel by the multiplexing circuit 3103. Multiplexing is performed by multiplying the spread code generated by the spread code generator 3121 for each channel in synchronization with the reference signal generated by the control circuit 3120 and analogly adding these multiplication results. The multiplexed data is modulated by the modulator 3109 and transmitted from the transmission antenna 3117 as the first category information. The carrier wave oscillator 3104 multiplies based on a reference signal generated by the control circuit 3120 to generate a carrier wave. The reference signal generated by the control circuit 3120 is superimposed on the power line 3116 by the superimposing circuit 3125 as the second category information, and transmitted to the image display unit 3105 and the speaker unit 3124.

  Unlike the above-described embodiments 14 to 23, the power supply line is an AC power supply, but the superimposing circuit 3125 and the separation circuit 3126 can be configured by a low-pass filter and a high-pass filter as shown in FIG. A terminal 3127 is a power line and supplies power to each unit of the tuner decoder unit 3101. Image data, text data, or audio data propagates through the wireless propagation path 3119 as first category information, is received by the receiving antenna 3118, demodulated by the demodulator 3107, despread by the despreading circuit 3108, and demultiplexed, Only the image signal is extracted, and the extracted image data is stored in the display unit storage circuit 3110. The image data stored in the display storage circuit 3110 is sequentially read and displayed on the screen of the image display device built in the image display unit 3105. Similarly, information sent to the speaker unit 3124 is also replicated with a configuration similar to that inside the image display unit 3105.

  Here, the reference signal transmitted as the second category information superimposed on the power supply line 3116 is separated by the separation circuit 3126, and the control circuit 3123 determines various signals that define the operation in the image display unit 3128 based on the reference signal. Is generated. The carrier wave for demodulation is multiplied based on the control signal generated by the control circuit 3123, and the carrier wave oscillator 3106 oscillates. A spreading code generator 3122 used for despreading is controlled by the control circuit 3123 and generates a spreading code in synchronization with a reference signal sent as second category information. By adopting such a configuration, since the carrier wave is always tracked in both transmission and reception, the carrier wave oscillator 3106 is not required to have high frequency accuracy. In addition, since the despreading code can be synchronized, the despreading circuit 3108 can be significantly simplified.

  In addition, by superimposing the second category information on the power supply line 3116, it is possible to construct a home theater by connecting only the power supply line 3116 between the image display unit 3105, the tuner decoder unit 3101 and the speaker unit 3124. Thus, the configuration of the home theater is simplified.

FIG. 25 is a conceptual diagram showing a main part of still another embodiment of the electronic device according to the present invention.
In FIG. 25, data is transmitted from the transmission unit block 4112 to the reception unit block 4113. Information is transmitted from a transmission circuit 4101 having transmission information to a reception circuit 4104 that receives the information. Transmission information emitted from the transmission circuit 4101 is encrypted by the encryption unit 4114 using the encryption key held by the key buffer circuit 4103, modulated by the modulator 4102, and transmitted as an electromagnetic wave signal (radio wave) from the transmission antenna 4110.

  The encryption key is generated by the key generation circuit 4116, and the generated encryption key is sent to and held in the key buffer circuit 4103, transmitted through the wired path 4107, and stored in the key buffer circuit 4105 in the reception unit block 4113. . An electromagnetic wave signal emitted from the transmitting antenna 4110 and propagating through the space (wireless propagation path 4108) is received by the receiving antenna 4111, demodulated by the demodulator 4106, decoded by the decoder 4115, and then output to the receiving circuit 4104. .

The key buffer circuit 4103 and the key buffer circuit 4105 continue to hold the encryption key held until the key generation circuit 4116 sends the encryption key, and after the key generation circuit 4116 finishes transferring the encryption key. The encryption key is updated in synchronization with each other. Since the key generation circuit 4116 frequently updates the key, the security is further improved.
The key generation circuit 4116 is in the reception unit block 4113 and may be sent to the key buffer circuit 4103 in the transmission unit block 4112 through the wired path 4107.

  The ciphers used in the encryptor 4114 and the decryptor 4115 do not need to use a complicated algorithm such as public key cryptography. This is because the encryption key is transmitted at a close distance as in the same device and by wired communication, so there is no worry of the encryption key being stolen or tampered with when distributing the encryption key, so complicated encryption key distribution This is because the common key cryptography can be used directly without taking a procedure.

  According to the present embodiment, by encrypting the data inside the electronic device and transmitting it wirelessly, the wiring necessary for high-speed data transmission is eliminated, and various problems that occur with the speeding up of the operation of the electronic device are safe. It can be solved at once without damaging.

FIG. 26 is a conceptual diagram showing the main part of another embodiment of the electronic apparatus according to the present invention.
In FIG. 26, it is assumed that data is transmitted from the transmission unit block 4212 to the reception unit block 4213. Information transmission is performed from a transmission circuit 4201 having transmission information to a reception circuit 4204 that receives the information. Transmission information generated by the transmission circuit 4201 is added by a random number generated by a random number generator 4205 by an adder 4214, modulated by a modulator 4202, and transmitted as an electromagnetic wave signal (radio wave) from a transmission antenna 4210. The random number generated by the random number generator 4205 is simultaneously distributed to the subtracter 4215 in the receiving unit block 4213 through the wired path 4207. An electromagnetic wave signal emitted from the transmitting antenna 4210 and propagating through the space (wireless propagation path 4208) is received by the receiving antenna 4211, demodulated by the demodulator 4206, and then distributed from the random number generator 4205 by the subtractor 4215. After being subtracted and decoded with the incoming random number, it is output to the receiving circuit 4204.

  Since addition on the Galois field (GF (2)) can be realized by an exclusive OR circuit having a simple circuit, the configurations of the adder 4214 and the subtracter 4215 are simple. When the transmission circuit 4201 outputs serial data, addition can be realized simply by taking an exclusive OR with a 1-bit random number. In addition, in the Galois field GF (2), addition and subtraction are the same (equivalent) operation, so that a subtractor necessary for decoding can be realized by an exclusive OR circuit, and the configuration is simple. When the data generated by the transmission circuit 4201 is not serial but parallel data, a random number and an exclusive OR are taken for each bit, and the calculation is simplified if the carry is ignored. If the random number generator 4205 frequently generates random numbers and constantly updates the random numbers, the security of the system is further enhanced.

The random number generator 4205 is in the reception unit block 4213 and may be sent to the adder 4214 in the transmission unit block 4212 through the wired path 4207.
According to the above-described embodiments, the data in the electronic device is randomized and transmitted wirelessly, thereby eliminating the wiring necessary for high-speed data transmission and safely preventing various problems caused by the speeding up of the electronic device operation. It can be solved at once without losing sex.

FIG. 27 is a conceptual diagram showing the main part of still another embodiment of the electronic device according to the present invention.
In FIG. 27, data is transmitted from the transmission unit block 4312 to the reception unit block 4313. Information is transmitted from a transmission circuit 4301 having transmission information to a reception circuit 4304 that receives the information. Transmission information emitted by the transmission circuit 4301 is spread-modulated by the spread modulator 4302 and transmitted from the transmission antenna 4310 as an electromagnetic wave signal (radio wave). A spreading code used for spreading modulation is generated by a spreading code generator 4303.

  The spreading code generated by the spreading code generator 4303 is sent to and stored in the spreading code buffer circuit 4314. At the same time, the spread code generated by the spread code generator 4303 is also sent to the spread code buffer circuit 4315 in the receiver block 4313 through the wired path 4307 and stored. The spread modulator 4302 spread-modulates transmission information with the spread code stored in the spread code buffer circuit 4314. An electromagnetic wave signal emitted from the transmission antenna 4310 and propagating through the space (wireless propagation path 4308) is received by the reception antenna 4311, despread by the demodulator 4306, and output to the reception circuit 4304. As the spreading code used for despreading, the same code as the spread-modulated code at the time of transmission is used at the same timing. The two spreading code buffer circuits 4314 and 4315 are controlled to operate synchronously for that purpose.

The spreading code generator 4303 is in the receiving unit block 4313 and may be sent to the spreading code buffer circuit 4314 in the transmitting unit block 4312 through the wired path 4307.
The spreading code can be freely generated at any time by the spreading code generator 4303. Since the changed spreading code is always synchronized and kept tracking between transmission and reception by the action of the two spreading code buffer circuits 4314 and 4315, the spreading code can be freely changed at any time as needed. Also, very long spreading codes can be used.

  Even if a third party receives a leaked electromagnetic wave signal and attempts to decode it, it cannot be decoded unless the spreading code is known, and the spreading code is notified to the receiving side by wired communication in the electronic device. It is very difficult for the three parties to steal the spreading code. Therefore, the system is very safe. Further, if a long spreading code is used or the spreading code is changed frequently, the safety is further improved.

  According to the above-described embodiments, the data in the electronic device is spread-coded and transmitted wirelessly, thereby eliminating the wiring necessary for high-speed data transmission and causing various problems that occur with the speeding up of the electronic device operation. It can be solved at once without compromising safety.

FIG. 28 is a view showing still another embodiment of the electronic apparatus according to the present invention.
In FIG. 28, the electronic device is divided into a main body portion 4405 and a display portion 4412, which are integrated through a hinge 4407. The display data generated by the liquid crystal controller 4408 is added to the random number generated by the random number generator 4413, sent to the modulator 4400, modulated, converted into electromagnetic waves (radio waves) from the transmitting antenna 4409, and propagated through space. The electromagnetic wave signal transmitted from the transmission antenna 4409 is received by the reception antenna 4410, demodulated by the demodulator 4402, and then subtracted from the random number added at the time of transmission by the subtractor 4414 to be restored to display data. Display data is sent to the liquid crystal driver 4401 and displayed on the liquid crystal display 4406.

  The random number generated by the random number generator 4413 is transmitted to the subtracter 4414 through the wired path 4411. Since this signal is sufficient at a low rate compared to the transmission data rate, and the number of signal lines required is small, it is easy to wire through the hinge 4407. Furthermore, the degree of freedom of wiring and component arrangement is also increased, and the modulator 4400, the transmission antenna 4409, the demodulator 4402, and the reception antenna 4410, which are signal transmission units, are arranged far from the hinge 4407 as shown in FIG. It is also possible to do. In addition, the restrictions on the arrangement of parts are reduced, and the degree of design freedom for improving the design and usability of the device is greatly increased.

  As the data to be transmitted increases in speed, it becomes difficult to transmit the transmission line, but transmission by electromagnetic waves in the space becomes easier. On the other hand, safety problems such as eavesdropping due to leakage of electromagnetic wave signals cannot be deciphered unless the added random numbers are known if random numbers are added to form a radio signal as in this embodiment. Since the added random number is sent to the receiving side through the wired path 4411 in the electronic device, it is impossible for a third party to know the random number, and the safety is high.

FIG. 29 is a block diagram of a main part of an embodiment of the data transmission and electronic device according to the present invention.
In FIG. 29, a CPU 4501 controls the entire electronic device, generates image data to be displayed on a display body using decompression of compressed image data such as MPEG and JPEG, and image data captured by an image sensor, and a video memory 4502. Write to. The liquid crystal controller 4503 reads display data 4525 from the video memory 4502 in accordance with the driving order of the liquid crystal display body 4517 and outputs the display data 4525 to the logic circuit 4504 together with the horizontal synchronization signal 4523 and the vertical synchronization signal 4524 of the liquid crystal display body 4517. The logic circuit 4504 rearranges data such as parallel conversion and display of the display data 4525 and constructs a communication packet.
Primary modulator 4505 modulates the pulse train generated by pulse generator 4506 to this signal. For the primary modulation, pulse position modulation, biphase pulse modulation, or the like for the pulse train can be used. The signal subjected to the primary modulation is spread and modulated by the spread modulator 4507 with the spread code generated by the spread code generator 4508.

The pulse train subjected to the spread modulation is subjected to waveform shaping into a very short time pulse so as to become a broadband pulse having a low spectral density by the pulse shaping circuit 4509 and then radiated as an electromagnetic wave by the transmission antenna 4510. The radiated electromagnetic field is not a sine wave modulated but a very thin pulse train.
The radiated electromagnetic wave is received by the receiving antenna 4511 through the wireless propagation path 4526, amplified by the preamplifier 4512 as necessary, and then correlated with the pulse template generated by the pulse generator 4513 by the correlator 4514. Is done. The output of the correlator 4514 is despread by the despreading circuit 4515 by the spreading code sent from the spreading code generator 4508 through the wired path 4527, then demodulated by the demodulator 4517, and the signal before the primary modulation ( Communication packet configured by the logic circuit 4504). The logic circuit 4518 generates a display data signal 4519, a horizontal synchronization signal 4520, a vertical synchronization signal 4521, and an X clock signal 4522 for the X driver from the communication packet restored by the demodulator 4517, and displays the liquid crystal display. Send to the body and display. On the receiving side, the spreading code necessary for despreading is sent from the transmitting side via the wired path 4527, so there is no need to have a spreading code, and no synchronization acquisition for despreading is required, and the circuit on the receiving side is extremely Simplified.

  In UWB communication, the leaked electromagnetic wave itself has a very weak spectral density, and it is essentially difficult for a third party to intercept it so as not to be noticed. Furthermore, in this embodiment, since the spreading code is transmitted to the receiving side through the wired path 4527 in a closed space inside the electronic device, the third party cannot know the spreading code. Furthermore, since the spreading code can be changed at any time, the security is further increased. For this reason, it is possible to avoid various conventional problems associated with high-speed data transmission to the liquid crystal display body 4517 while maintaining high safety with almost no increase in cost.

FIG. 30 is a block diagram showing the main part of an embodiment of the electronic apparatus according to the present invention, and shows an example in which the information transmission method according to the present invention is applied to an electronic apparatus using an image sensor.
In FIG. 30, an image sensor 4601 is activated by a horizontal synchronization signal 4620 and a vertical synchronization signal 4621 generated from the control circuit 4602, and outputs captured image data 4619. The logic circuit 4603 receives these signals and constructs a packet for wireless transmission. The packet is encrypted by the encryptor 4604, modulated by the modulator 4605, and radiated as an electromagnetic wave from the transmission antenna 4607.

  A key used for encryption is generated by a key generation circuit 4615 and is simultaneously transmitted to the key buffer circuit 4606 on the transmission side and the key buffer circuit 4611 on the reception side. The key buffer circuit 4606 and the key buffer circuit 4611 output the encryption keys to the encryption device 4604 and the decryption device 4613 in synchronization with both transmission and reception, so that the decryption device 4613 can correctly decrypt them. The key is sent from the key generation circuit 4615 through the wired path 4623 to the key buffer circuit 4611 on the reception side.

  The electromagnetic wave signal transmitted from the transmission antenna 4607 propagates through a wireless propagation path (space) 4622, is received by the reception antenna 4608, is amplified by the preamplifier 4609, and an unnecessary out-of-band signal is removed by the bandpass filter 4610. And demodulated by a demodulator 4612. The demodulated signal is decrypted by the decoder 4613 and sent to the serial-parallel conversion circuit 4614. The serial / parallel conversion circuit 4614 extracts an image data portion from the demodulated reception packet, performs serial / parallel conversion for each pixel, and generates pixel data.

The logic circuit 4616 generates a memory address for writing to the video memory 4617 in accordance with the demodulated pixel data, and writes the image data to the address of the video memory 4617 directly or via the CPU 4618. The CPU 4618 accesses the video memory 4617 and uses the image data for various applications.
Even if a signal propagating through the wireless communication path 4622 leaks and the third party wiretap, the signal is encrypted, so unless the third party obtains the encryption key, the contents of the transmission data are It is very difficult to know. Since the encryption key is wired and transmitted by a wired communication path within a short distance such as in the same device, it is impossible for a third party to know the encryption key, and the security is very high. Since the key generation circuit 4615 and the key buffer circuits 4606 and 4611 are always connected through the wired line 4623, the encryption key can be changed at any time. If the encryption key is changed frequently, the security is further increased.

In this embodiment, the key generation circuit 4615 is placed on the data transmission side. However, if the data reception side passes through the communication path 4623 to the transmission side key buffer circuit 4606, the same effect can be obtained. It is done.
The above-described configuration, that is, data transmission from the image sensor 4601 is encrypted and wirelessly transmitted, which has become more apparent as the image sensor 4601 increases in size, increases in power consumption, wiring position restrictions, EMI problems, reliability Various problems caused by wired transmission such as deterioration can be eliminated without sacrificing safety.

FIG. 31 is a conceptual diagram showing the main part of still another embodiment of the electronic device according to the present invention.
In FIG. 31, a transmission unit block 4712 is provided with a transmission circuit 4701 having information to be transmitted, and a reception unit block 4713 is provided with a reception circuit 4704 for receiving the transmission information. Data is transmitted from the transmission unit block 4712 to the reception unit block 4713.

  Transmission data emitted from the circuit 4701 is subjected to secret processing by the secret circuit 4703, modulated by the modulator 4702, and transmitted as an electromagnetic wave from the transmission antenna 4710. The secret circuit 4703 also generates a secret code, superimposes the secret code on the power line 4707 by the superimposing circuit 4715, and transmits the signal to the receiving unit block 4713 by wire along with the power voltage. In the secret processing, addition / subtraction of random numbers, encryption, spread modulation and the like as described in the above embodiment can be applied. The secret code corresponds to a random number, an encryption key, or a spreading code.

  An electromagnetic wave signal transmitted from the transmission antenna 4710 and carrying transmission data propagating through the space (wireless propagation path 4708) is received by the reception antenna 4711, demodulated by the demodulator 4706, and output to the decoder 4705. The decoder 4705 removes the secret processing imposed on the received data using the secret code superimposed on the power supply line 4707 and transmitted by wire transmission and separated by the separation circuit 4714, decodes it, and transmits it to the reception circuit 4704. The secret code may be transmitted from the data receiving block 4713 to the transmitting block 4712. In this case, the secret code is generated on the receiving unit block 4713 side, 4714 is the superposition circuit, and 4715 is the separation circuit.

  The secret code is superimposed on the power supply line 4707 together with the power supply voltage, and is transmitted and received between the transmitter block 4712 and the receiver block 4713. The power supply 4716 supplies a power supply voltage to all circuits in the transmitter block 4712, and the secret code generated by the secret circuit 4703 is superimposed on the power supply line 4707 by the superimposing circuit 4715. Details of the inside of the superposition circuit 4715 are shown within a one-dot chain line 4717. Terminal 4728 is connected to power supply 4716, and terminal 4729 is connected to power supply line 4707. The secret code emitted from the secret circuit 7403 is superimposed on the power line 4707 through the high pass filter 4724 from the terminal 4725.

  The superimposed secret code signal does not leak to the terminal 4728 side by the low-pass filter 4727, and therefore all the circuits of the transmitter block 4712 operate correctly. The secret code superimposed on the power supply line 4707 is separated by the separation circuit 4714 and transmitted to the decoder 4705. The inside of the separation circuit 4714 will be described in detail in a chain line 4718. Terminal 4721 is connected to power supply line 4707.

  The secret code signal input to the terminal 4721 is separated by the high pass filter 4723 and transmitted to the decoder 4705 from the terminal 4720. Since the low pass filter 4722 prevents leakage of the information of the superposed secret code, only the energy supplied from the power supply 4712 is transmitted from the terminal 4719 and is correctly transmitted to all the circuits in the receiving unit block 4713 through the terminal 4719. Supply power supply voltage. When the secret code is sent from the receiving unit block 4713 to the transmitting unit block 4712, the functions of the superimposing circuit 4715 and the separating circuit 4714 are reversed, but as shown in FIG. May be the same.

By adopting such a configuration, the secret code used to maintain the safety of signals transmitted wirelessly is transmitted superimposed on the power line, so that signals within the electronic device can be exchanged with the minimum number of wires. Thus, an electronic device with high reliability and safety can be realized by a simple method.
In particular, when such a configuration is used for data transmission between semiconductor chips, signals between chips are performed wirelessly by imposing a secret processing, and a secret code for the secret processing is transmitted superimposed on a power line. The necessary wiring is only a power source, and the mounting of the semiconductor chip can be made extremely easy without sacrificing safety.

FIGS. 32 to 39 are diagrams showing examples of timings of wired communication and wireless communication.
In FIG. 32, data is transmitted wirelessly between circuit blocks, and a synchronization signal is simultaneously transmitted between these circuit blocks by wire.
In FIG. 33, when bidirectional communication is performed between circuit blocks, the synchronization signal may be transmitted bidirectionally by wire, while the other signal is synchronized with the synchronization signal transmitted in one direction. Wireless communication may be performed.

In FIG. 34, data transmission may be performed between circuit blocks using both wired and wireless.
In FIG. 35, when data is transmitted wirelessly between circuit blocks, wireless communication control information may be sent by wire. For example, a transmission start notification or encryption key may be transmitted by wire, and wireless communication may be started upon receipt of the transmission start notification or encryption key. Further, when wireless communication is terminated, additional information notification may be performed by wire.

In FIG. 36, when wireless communication control information is sent by wire, the encryption key may be transmitted by wire and the encryption key may be confirmed by wire before starting wireless communication. .
Further, control may be confirmed instead of confirming the encryption key.
In FIGS. 37 to 39, the encryption key may be changed for each wireless communication frame. Here, for each wireless communication frame, confirmation of the encryption key may be performed by wire, or transmission end notification may be performed by wire. Note that the wireless communication frame refers to a period from the start of one wireless communication to the end of the wireless communication.

  As described above, according to the above-described embodiment of the present invention, it is possible to use wireless data transmission by electromagnetic waves at a very short distance as in the same device or system of the electronic device, and the conventional high-speed data transmission. Various problems and mounting problems can be eliminated, and an electronic device with low cost, high reliability and low power consumption can be realized.

  The present invention is not limited to the above-described embodiment, and can be applied to a wide range of uses such as connection between a storage device such as a hard disk drive built in an electronic device and a CPU.

  DESCRIPTION OF SYMBOLS 1,21 ... 1st housing | casing part, 2,22 ... 2nd housing | casing part, 3,23,207,2207,4407 ... Hinge, 4,24 ... Operation button, 5,25 ... Microphone, 6,26 ... External Antenna for wireless communication, 7, 10, 27, 30 ... Antenna for internal wireless communication, 8, 11, 28 ... Display, 9, 29 ... Speaker, 12 ... Image sensor, 101, 104, 1001, 1005 ... Circuit element, 102, 200, 308, 707, 905, 1004, 1309, 2102, 2200, 2308, 2607, 2705, 2903, 3004, 3109, 4102, 4202, 4400, 4605, 4702 ... modulators, 106, 202, 314, 712 , 817, 912, 1008, 1307, 2106, 2202, 2314, 2612, 2712, 2817, 2907, 3008, 31 7, 4106, 4202, 4306, 4406, 4517, 4612, 4706 ... demodulator, 112, 2112, 4112, 4212, 4312, 4712 ... transmission block, 113, 2113, 4113, 4213, 4313, 4713 ... reception block , 103, 105, 2103, 2105... Interface circuit 107, 340, 827, 923, 1014, 1316, 2723, 4107, 4207, 4307, 4411, 4527, 4623. , 1319, 2108, 2626, 2722, 2826, 3015, 3119, 4108, 4208, 4211, 4308, 4526, 4622, 4708 ... wireless propagation paths, 110, 212, 310, 708, 810, 907, 10 0, 1317, 2110, 2209, 2310, 2608, 2707, 2810, 3010, 3117, 4110, 4210, 4310, 4409, 4510, 4607, 4710 ... transmitting antenna, 111, 210, 311, 709, 811, 908, 1011 , 1318, 2111, 2210, 2311, 2609, 2708, 2811, 3011, 3118, 4111, 4211, 4311, 4410, 4511, 4608, 4711 ... receiving antennas, 301, 701, 801, 918, 2301, 2601, 2718, 2801, 4501, 4618 ... CPU, 302, 702, 802, 917, 2302, 2602, 2717, 2802, 4502, 4617 ... video memory, 208, 303, 703, 803, 2208, 2303 2603, 2803, 4408, 4503 ... liquid crystal controller, 805, 2805, 4505 ... primary modulator, 807, 2807, 4302, 4507 ... diffusion modulator, 206, 2206, 2318, 4406, 4517 ... liquid crystal display, 901 2701, 4601: Image sensor, 309, 502, 513, 706, 906, 1304, 1306, 2902, 2908, 3104, 3106 ... Carrier wave oscillator, 326, 500, 517, 713, 904 ... Frequency divider, 315, 508, 520, 715, 915, 2309, 2315, 2402, 2408, 2413, 2420, 2606, 2615, 2706, 2715 ... PLL, 501,505,515,519,521,2401,2405,2415,2419,2421 ... multiplier 514,5 2, 2414, 2422 ... + 90 ° phase shifter, 705, 716, 808, 816, 1321, 1322, 2605, 2616, 2808, 2816, 3121, 3122 ... spreading code generator, 704, 2604 ... code multiplexing circuit, 714, 815, 2815, 1308, 2614, 3108, 4515 ... despreading circuit, 806, 813, 2806, 2813, 4506, 4513 ... pulse generator, 809, 2809, 4509 ... pulse shaping circuit, 814, 2814, 4514 ... Correlator, 2107, 2211, 2330, 2627, 2723, 2827, 2905, 3014, 3116, 4707 ... power line, 2115, 2117, 2214, 2326, 2613, 2704, 2828, 2904, 3017, 3125, 4715, 4717 ... Overlap times Path, 2114, 2118, 2215, 2327, 2622, 2711, 2829, 2906, 3016, 3126, 4714, 4718 ... separation circuit, 2101, 3001, 4101, 4201, 4301, 4701 ... transmission circuit, 2104, 3005, 4104 4204, 4304, 4704 ... receiving circuit, 4103, 4105, 4606, 4611 ... key buffer circuit, 4114, 4604 ... encryptor, 4115, 4613, 4705 ... decryptor, 4116, 4615 ... key generation circuit, 4214 ... adder, 4215, 4414 ... subtractor, 4205, 4413 ... random number generator, 4303, 4508 ... spreading code generator, 4314, 4315 ... spreading code buffer circuit.

Claims (26)

  Wireless communication means for wirelessly communicating the first category information and wired communication means for wiredly communicating the second category information, wherein the wireless communication of the first category information and the wired communication of the second category information are one communication link An information transmission method characterized by being performed within the network.   A wireless communication unit that wirelessly communicates the first category information; and a wired communication unit that performs wired communication of the second category information. The wireless communication of the first category information and the wired communication of the second category information are performed in one communication link. An electronic device characterized by being performed. A wireless communication unit for wirelessly communicating the first category information;
An electronic apparatus comprising: a wired communication unit configured to perform wired communication of second category information used for control or processing of the first category information. An information transmission unit for transmitting the first category information;
An encryption unit for encrypting the first category information of the information transmission unit;
A wireless transmission unit that transmits the first category information encrypted by the encryption unit using an electromagnetic wave signal;
A wireless receiver for receiving an electromagnetic wave signal transmitted by the wireless transmitter;
A decoding unit for decoding a signal received by the wireless reception unit;
A key generation unit that generates an encryption key as second category information;
An electronic apparatus comprising: a wired communication unit that distributes the encryption key generated by the key generation unit to the encryption unit and the decryption unit by wired communication. An information transmission unit for transmitting the first category information;
A random number generator for generating random numbers as second category information;
A wired communication unit for distributing the random number generated by the random number generation unit by wired communication;
An adding unit for adding the random number to the first category information transmitted by the information transmitting unit;
A wireless transmission unit for transmitting the information added by the addition unit by an electromagnetic wave signal;
A wireless receiver for receiving an electromagnetic wave signal transmitted from the wireless transmitter;
An electronic device comprising: a subtracting unit that subtracts and decodes the random number from information received by a wireless communication unit. An information transmission unit for transmitting the first category information;
A spreading code generating unit for generating a spreading code as second category information;
A wired communication unit that distributes the spread code generated by the spread code generation unit by wired communication;
A modulation unit that spread-modulates the first category information transmitted by the information transmission unit using the spreading code;
A wireless transmitter that transmits information modulated by the modulator using electromagnetic waves;
A wireless receiver for receiving the electromagnetic wave signal;
An electronic apparatus comprising: a demodulator that despreads information received by the wireless receiver using the spreading code.   The electronic device according to claim 2, wherein the wired communication unit performs communication by superimposing a signal on a power supply line.   The electromagnetic wave conversion unit that converts the first category information into an electromagnetic wave signal, and the electromagnetic wave restoration unit that receives the electromagnetic wave signal and restores the first category information to the first category information. The electronic device according to claim 1.   9. The electronic apparatus according to claim 8, wherein the electromagnetic wave conversion unit and the electromagnetic wave restoration unit are driven by a carrier wave generated by the same carrier wave oscillator.   9. The electromagnetic wave conversion unit according to claim 8, wherein the electromagnetic wave conversion unit performs spread spectrum modulation, the electromagnetic wave restoration unit performs reverse spectrum spread, and synchronization information of the electromagnetic wave conversion unit and the electromagnetic wave restoration unit is transmitted by wire. Electronic equipment.   The electromagnetic wave conversion unit performs modulation to a UWB signal, the electromagnetic wave restoration unit performs demodulation from the UWB signal, and synchronization information of the electromagnetic wave conversion unit and the electromagnetic wave restoration unit is transmitted by wire. Item 9. The electronic device according to Item 8. A wireless transmission unit that modulates first category information and transmits it as an electromagnetic wave signal, a wireless reception unit that receives and demodulates the electromagnetic wave signal, a wired transmission unit that superimposes and transmits second category information on a power line, and the power line A wired receiver for separating the signal superimposed on
The first category information and the second category information are transmitted in one communication link by the wireless transmission unit and the wired transmission unit, and the wireless transmission unit and the wireless reception unit are supplied with power from the common power line. An electronic device characterized by that. The wireless transmission unit includes a control unit that generates a reference signal, and a modulation unit that converts the first category information into an electromagnetic wave signal in synchronization with the reference signal,
Second category information transmitted and received by the wired transmission unit and the wired reception unit is the reference signal,
13. The electronic apparatus according to claim 12, wherein the wireless reception unit includes a demodulation unit that demodulates the first category information in synchronization with the reference signal received by the wired reception unit. The wireless transmission unit includes a control unit that oscillates a reference signal, a first carrier oscillation unit that oscillates a carrier wave synchronized with the reference signal, and modulates a carrier wave emitted by the carrier wave oscillation unit with first category information into an electromagnetic wave signal. A modulation unit for conversion,
Second category information transmitted and received by the wired transmission unit and the wired reception unit is the reference signal,
The wireless reception unit demodulates first category information using a second carrier oscillation unit that oscillates a carrier wave synchronized with the reference signal received by the wired reception unit, and a carrier wave generated by the second carrier oscillation unit. 13. The electronic device according to claim 12, further comprising a demodulator. The wireless transmission unit is configured to synchronize a carrier wave generated by the control unit that oscillates a reference signal, a carrier wave synchronized with the reference signal, and a carrier wave generated by the carrier wave signal with the reference signal using first category information. A modulation unit that modulates and converts to an electromagnetic wave signal,
Second category information transmitted and received by the wired transmission unit and the wired reception unit is the reference signal,
The wireless reception unit oscillates the first category information using the second carrier oscillation unit that oscillates a carrier wave synchronized with the reference signal received by the wired reception unit, and the carrier wave emitted by the second carrier oscillation unit. 13. The electronic device according to claim 12, further comprising a demodulator that demodulates the reference signal received by the receiver in synchronization with the reference signal.   The wireless transmission unit modulates the first category information by phase modulation, generates modulation / demodulation carrier information from a reference signal that is wire-transmitted as second category information, and the transmission packet transmitted by the wireless transmission unit includes: 13. The electronic device according to claim 12, wherein synchronization is established with a reference signal transmitted by wire as the second category information.   The radio transmission unit modulates the first category information by spread spectrum modulation, and the radio reception unit demodulates the first category information by despreading the spectrum, and the synchronization information or carrier wave information of the modulation / demodulation spread code 13. The electronic device according to claim 12, wherein the electronic device is synchronized with a second category information generated from a reference signal transmitted by wire.   The wireless transmission unit modulates first category information by UWB modulation, and synchronization information of a pulse template for demodulation is generated from a reference signal transmitted by wire as the second category information, and is synchronized. The electronic device according to claim 12.   The electronic device according to claim 2, wherein the second category information includes synchronization information or carrier wave information regarding wireless communication of the first category information.   The said 2nd category information contains the information which shows the reception status of the said 1st category information, and is transmitted from the receiving side of the said 1st category information to the transmission side, The any one of Claim 2 to 19 characterized by the above-mentioned. The electronic device according to item.   21. The electronic device according to claim 2, wherein the first category information includes at least one of image data, text data, and audio data. A storage unit for storing the first category information;
A display for displaying the first category information;
A display control unit that reads out and outputs the first category information from the storage unit in accordance with the driving order of the display body;
The electronic device according to any one of claims 2 to 21, further comprising a display body driving unit that drives the display body based on the first category information read by the display control unit. An image sensor;
23. The electronic apparatus according to claim 2, further comprising an imaging control unit that reads and outputs an image signal captured by the imaging element as the first category information.   24. The electronic device according to claim 2, wherein information transmitted between an electronic circuit on the integrated circuit and outside the integrated circuit is wirelessly transmitted as first category information.   A display unit; a speaker unit; and a data source unit that generates image data to be displayed on the display unit and acoustic data for driving the speaker unit, and is transmitted between the display unit or the speaker unit and the data source unit. The electronic device according to any one of claims 2 to 23, wherein the image data and the sound data are wirelessly transmitted as first category information. A first housing part;
A second casing connected to the first casing;
A connecting portion that connects the first housing portion and the second housing portion so as to change a positional relationship between the first housing portion and the second housing portion;
An external wireless communication antenna mounted on the first casing or the second casing;
An external wireless communication control unit that is mounted on the first housing unit and mainly controls external wireless communication performed via the external wireless communication antenna;
A display unit mounted on the second housing unit;
A first antenna for internal wireless communication mounted on the first housing part;
A second internal radio communication antenna mounted on the second housing part;
A first internal wireless communication control unit that is mounted on the first housing unit and controls internal wireless communication performed via the first internal wireless communication antenna;
A second internal wireless communication control unit that is mounted on the second housing unit and controls internal wireless communication performed via the second internal wireless communication antenna;
A wireless communication terminal, comprising: a wired communication unit mounted on the first housing unit or the second housing unit and exchanging a part of information transmitted by the internal wireless communication by wire.

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