JP2005210611A - Information transmitting system and electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize a low cost and high reliability electronic apparatus, by making wireless a method of high-speed data transmission and removing the defects, limitations and the like of the conventional information transmitting systems. <P>SOLUTION: An information transmitting system includes a radio communication means for transmitting first category information and a wired communication means for transmitting second category information. The first category transmission information and the second category transmission information are transmitted, in parallel with each other by the radio communication means and the wired communication means. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an electronic apparatus incorporating an element that requires high-speed data transfer, such as a display element or an imaging element.

  In recent years, improvements in functions of cellular phones, notebook computers, digital cameras, and the like have become increasingly complex, requiring high resolution and high definition of built-in display elements and imaging elements. In particular, in mobile phones, folding functions called clamshell type have become mainstream because of the demand for smaller and lighter weight and lower power consumption as well as higher functions such as built-in camera functions and larger displays. . FIG. 11 illustrates a typical block diagram of an electronic device using an active matrix liquid crystal display as a display element, and FIG. 12 illustrates a time diagram thereof. The CPU 1101 generates image data to be displayed and writes it in the video memory 1102. The CPU 1101 generates image data to be displayed by decompression or calculation from a compressed image such as JPEG or MPEG or moving image data. The liquid crystal controller 1103 generates various timings necessary for liquid crystal display, that is, an X clock signal 1115, a horizontal synchronizing signal 1114, and a vertical synchronizing signal 1118 of the X driver 1113, and also outputs image data from the video memory 1102 in the order to be displayed. It is read out and sent to the driver of the liquid crystal display 1108 (X driver 1113 and Y shift register 1107 constituting the Y driver). The X driver 1113 includes an m-stage X shift register 1104, an m-word latch 1105, and m DA converters 1106 when the pixels of the liquid crystal display 1108 are composed of n rows and m columns. The liquid crystal controller 1103 generates a vertical synchronizing signal 1118 and sends it to the Y shift register 1107 when reading the first pixel of the display frame. At the same time, the liquid crystal controller 1103 reads out the data to be displayed on the pixel in the first row and the first column of the liquid crystal display 1108 from the video memory 1102 and sends it to the data terminal of the latch 1105 as a display data signal 1116. As shown in FIG. 12, the X shift register 1104 reads the horizontal synchronization signal 1114 (FIG. 12A) generated by the liquid crystal controller 1103 by the X clock signal 1115 (FIG. 12B) and reads the image data in the first column. A signal X1 latch (FIG. 12C) for latching is generated. With this signal, data displayed on the pixel in the first row and first column is latched in the first column of the latch 1105. Subsequently, the liquid crystal controller 1103 reads out and outputs data to be displayed on the next pixel from the video memory 1102. The X shift register 1104 of the X driver 1113 shifts the horizontal synchronizing signal 1114 by one and generates a signal X2 latch (FIG. 12D) for latching the image data in the second column, thereby generating the first row and second column. Latch image data. Thereafter, the shift register 1104 sequentially shifts and sequentially latches data to be displayed on the first row. When the latch 1105 finishes storing the data for one row, the next horizontal synchronizing signal 1114 (FIGS. 12A and 12H, FIGS. 12A to 12F and FIGS. 12G to 12K). Note that the time scale of the horizontal axis has changed, so that the horizontal synchronization signal, which is the same signal, (h) is re-displayed in addition to (a) is output, and the DA converter 1106 is latched 1105. The D / A conversion is performed on the data held in the data and output to the column electrode Xi 1110 (1 ≦ i ≦ m). At the same time, the Y shift register 1107 outputs a selection signal to the first row electrode Y1. Similarly, the Y driver 1107 sequentially shifts the selection signal to the row electrode Yj 1109 (1 ≦ j ≦ n) every time the horizontal synchronizing signal 1114 is output. The inside of the alternate long and short dash line 1118 is an enlarged view of the matrix portion of the liquid crystal display 1108. When the row electrode Yj 1109 is selected, the active switch element Tr1111 transmits the DA converter 1106 output output to the column electrode Xi1110 to the pixel electrode Pix1112. Note that one DA converter 1106 may be placed on the liquid crystal controller side to transmit the data signal 1116 as an analog signal. In this case, the latch 1105 is an analog sample and hold circuit. This method can reduce the number of DA converters and has been widely used in the past, but even if it is a DA converter, it is sufficient that the voltage value finally applied to the pixel electrode is a predetermined value. Since the digital circuit such as the above can be used and the analog sample-and-hold circuit becomes unnecessary, the method described here has become mainstream as the density of LSIs increases. In this method, since the data is transmitted as a digital signal, the number of signal lines is very large, and for example, a total of 24 8-bit × 3 primary colors are required.

  After the display signal at the right end of the row is output from the liquid crystal controller 1103, the time until the display signal at the left end of the next row is output, or after the image data of the bottom row on the screen has been output, The time until the image data of the first row is output is called a (horizontal or vertical) blanking period or a blanking period, and cannot be reduced to 0 in the CRT, but may be 0 in the liquid crystal display. FIG. 12 illustrates a case where a horizontal blanking period for one pixel and a vertical blanking period for one row are taken.

  In an electronic device using an image sensor such as a digital camera, the direction of signal transmission is reversed from that in the case of using a display element, and the same circuit configuration is taken.

  In recent years, there has been a demand for large display, high resolution, and reduction in size and weight of an electronic device incorporating a display element and an imaging element. Due to such a demand, the mounting substrates are often provided in a plurality, and in that case, they are often separated by the one-dot chain line 1117-1117 'in FIG. Inevitably, the connection between the CPU and the display element or imaging element becomes long. As the resolution of elements increases, the signal frequency of those lines increases, making connection difficult. In particular, the clamshell structure has a structure in which both are connected via a thin hinge portion. As the resolution of display devices and image sensors increases, the amount of data exchanged between both substrates increases, and high-speed transfer technology is required. In order to solve this problem, for example, (LVDS: Low Voltage Differential Signaling) has been proposed as a high-speed data transmission method for connecting 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 because sufficient resolution cannot be obtained even with this method.

Patent publication 3086456 (column 44) Patent publication 3330359 (column 46) Patent publication 3349426 Patent publication 3349490

  However, recent increases in the size of display bodies cannot provide sufficient performance even with these technologies. In order to obtain sufficient anti-noise characteristics (interference immunity, interference), careful design and adjustment are required. In LVDS, since the signal level is small, an analog signal is inevitably handled by a digital IC, resulting in a problem that power consumption increases.

  In addition, in order to transmit signals accurately, 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 consumed. There was also a problem that the power would become unacceptably large.

  Furthermore, when the wiring passes through a movable part such as a hinge part, the characteristic impedance changes depending on the degree of bending, so that impedance mismatch occurs depending on the situation, and signal degradation is caused by reflection at the bent part. 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 components are restricted.

  Further, as a matter of course, the number of signals exchanged through the hinge portion is several tens, and the wiring on the substrate cannot be used. Therefore, the flexible substrate is connected through the connector. Connections using flexible substrates and connectors have the disadvantages of high cost and low connection reliability.

  Furthermore, 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.

  Further, when a large amount of data is routed by such a long wiring at a high speed, the radiated electromagnetic field from the line increases, which causes electromagnetic interference to other electronic devices or to itself. In the conventional signal transmission using 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 signal amplitude level cannot be lowered. That is, EMI countermeasures become difficult, resulting in restrictions on device design and cost increase. Further, since driving on the transmission side simultaneously drives the stray capacitance of the line in addition to the load at the power receiving end, extra energy is required for signal transmission. That is, the result is an increase in power consumption.

  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 portion where wiring is difficult by the electromagnetic wave signal.

  However, in order to introduce the conventional wireless communication technology to data transfer in an electronic device, the mechanism is very complicated and difficult to implement compared to the case where transmission is performed by a conductive wire.

  Therefore, the present invention improves the conventional wireless communication technology and enables it to be applied to data transmission within the same electronic device, and makes the method of high-speed transmission of data having the above-mentioned various problems and restrictions wireless. An object of the present invention is to realize a low-cost and highly reliable electronic device by eliminating the disadvantages and limitations of the conventional information transmission method.

  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 the transmission information of the first and second categories is the wireless communication means and wired communication. It is characterized by being simultaneously transmitted by means.

  According to the above configuration, transmission of signal groups that are 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. Therefore, it is possible to avoid the complexity 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, and wiring for that is unnecessary, simplifying wiring such as flexible boards and connectors, resulting in high costs and reliability. The problem of sex disappears. In addition, it is possible to avoid the problem of power consumption that increases with the termination for impedance matching and the increase in data transmission speed. In addition, it is possible to alleviate restrictions on wiring routing and component placement, and improve the design and usability of the electronic device. Furthermore, since the electromagnetic waves used for signal transmission are performed within a short 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. Essentially improved and countermeasures become easier.

  The electronic device of the present invention includes 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, and wireless communication of the first category information and wired communication of the second category information. Are performed simultaneously.

  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 second category information of the electronic device of the present invention is characterized in that the first category information includes synchronization information related to wireless communication.

  According to the above configuration, the procedure for acquiring synchronization and the circuit on the receiving side can be omitted at the time of wireless transmission, and the circuit for wireless transmission can be simplified.

  The second category information of the electronic device of 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 can be easily 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 it is effective in ensuring 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 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 receiving side of signals transmitted wirelessly, it is possible to absorb variations in characteristics and timing at the transmitting and receiving ends, so high-precision components are not used. However, good 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 it is driven by a carrier wave generated by a common signal transmitted by wire on the transmission side and reception side of a signal transmitted wirelessly, it is not necessary to synchronize synchronous detection on the reception side. 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 spectrum reverse diffusion, 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 that can reduce interference caused by an electromagnetic wave signal transmitted to the system or interference received from the system. Furthermore, since synchronization information is transmitted by wire at the transmission / reception end, a synchronization circuit for acquiring synchronization from the received electromagnetic wave signal is not required at the reception end, and a simple despreading circuit can be used, so that the circuit can be simplified.

  In the electronic device according to the present invention, 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. It is characterized by that.

  According to the above configuration, high-speed and high-reliability data transmission is possible even in a strong electromagnetic field environment of an electronic device in which electromagnetic wave generation is a basic function, such as a mobile phone that communicates by radio waves. In the case of UWB communication, the definition of the maximum radiated electromagnetic field allowed by law is relaxed, and the design on the receiving side becomes easier. Further, since the UWB modulator and demodulator use the same synchronization information transmitted by wire, a circuit for extracting synchronization on the receiving side is unnecessary, and the circuit can be simplified.

  The electronic apparatus of the present invention reads the first category information from the storage unit according to the drive order of the storage unit that stores the first category information, the display body that displays the first category information, and the display body. A display control unit for outputting, and a display body driving unit for driving the display body based on the first category information read by the display control unit.

  According to the above configuration, display information to be displayed on the liquid crystal can be transmitted through the space without complicating the system, and wiring for that is not necessary, and wiring such as a flexible substrate and a connector can be simplified. Cost and reliability issues are eliminated. In addition, it is possible to avoid the problem of power consumption that increases with the termination for impedance matching and the increase in data transmission speed. In addition, it is possible to alleviate restrictions on wiring routing and component placement, and improve the design and usability of the electronic device. Furthermore, since the electromagnetic waves used for signal transmission are performed within a short 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. Essentially improved and countermeasures become easier.

  The electronic apparatus according to the present invention includes an image pickup device and an image pickup control unit that reads and outputs an image signal taken by the image pickup 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 the camera, the optical system and the electronic component must be mounted in the same casing, and there are many restrictions on mounting the electronic component. However, the above-described configuration of the present invention can alleviate this restriction.

  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 made 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 is an electronic device including a display unit, a speaker unit, image data to be displayed on the display unit, and a data source unit that generates acoustic data for driving the speaker unit. The image data and sound data transmitted between data source units are wirelessly transmitted as first category information.

  According to the above configuration, the speaker and screen of a multimedia device that handles video data and audio data can be connected wirelessly with simple hardware, and the interconnection can be facilitated.

  As described above, according to the above configuration 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 of an electronic device, and various problems associated with conventional high-speed data transmission. In addition, a mounting problem can be eliminated, and an electronic device with low cost, high reliability, and low power consumption can be realized.

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

  FIG. 1 is a conceptual diagram showing the main part of an embodiment of an information transmission system according to the present invention. It is assumed that data is transmitted from the transmission unit block 112 to the reception unit block 113. Reference numeral 101 denotes a circuit element having information to be transmitted, and reference numeral 104 denotes a circuit element that receives the transmission information. Transmission information emitted from the circuit element 101 is categorized, and first category information modulates the transmission data by the modulator 102 and transmits it as an electromagnetic wave from the transmission antenna 110. The second category information is signaled via the interface circuit 103 in a wired manner. An electromagnetic wave signal emitted from the transmitting antenna and carrying the first category information propagating through the space (propagation path 108) is received by the receiving antenna 111, demodulated by the demodulator 106, and output to the circuit element 104. The second category information transmitted by wire is transmitted to the circuit element 104 via the interface circuit 105. The second category information may be transmitted from the data reception block 113 to the transmission unit block 112, and in this case, 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 regulations. However, since the communication distance is very close, a communication path with sufficient quality can be obtained by appropriately setting the link budget. It can be secured.

  In this way, a large amount of information that requires high-speed transmission is not transmitted via the signal line, but it is not necessary to use the signal line because it propagates through the space by radio, and the conventional problems of the connector and the hinge structure associated therewith can be eliminated. . In addition, with conventional signal line transmission, charging / discharging to stray capacitance increases as the speed increases, and power consumption increases. Further, unnecessary radiated power emitted from the signal line increases, making it difficult to prevent interference with surrounding equipment. There was a drawback of becoming. In the transmission by 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 shielding enhancement to reduce unnecessary radiation. According to such a method of the present invention, it is sufficient that the radiated power transmitted from the transmitting antenna 110 is sufficient to ensure sufficient communication quality at a close distance in the same system, so the radiated power from the transmitting antenna 110 is reduced to this value. Therefore, power consumption and EMI countermeasures are substantially improved and facilitated. Moreover, it is freed from restrictions such as an increase in power consumption accompanying the termination for impedance matching of communication lines, arrangement of parts, and routing of lines.

  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, transmitter 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 is not necessary, 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 (Ultra Wide Band) communication. Furthermore, if the transmitter information can be transmitted, the clock signal used as a reference between the transmission and reception can be made common, and the transmission frequency accuracy required for the transmitter can be remarkably eased, and the electronic device can be easily realized. Further, in the case of an electronic device having a short-range communication interface such as a mobile phone, Bluetooth, or UWB (Ultra Wide Band), the electromagnetic wave that transmits the first category information interferes with the original communication of the electronic device. In some cases, the electromagnetic wave that transmits the first category information 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. It is possible to change the frequency and 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, if a request for increase / decrease in radiated electromagnetic wave energy is fed back, the minimum electromagnetic wave energy that can ensure communication quality on the receiving side can be set, and unnecessary radiation can be reduced. 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, since there is no signal line to be driven including the stray capacitance and transmission is performed wirelessly, power consumption can be reduced.

  FIG. 2 is a diagram showing an embodiment of an electronic apparatus according to the present invention. In the embodiment, the electronic device is divided into a main body portion 205 and a display portion 209 and integrated through a hinge 207. Reference numeral 203 denotes a main body board that controls the functions of the electronic apparatus main body. Various input / output devices such as a keyboard and a display device are connected to the electronic device. Reference numeral 204 denotes a keyboard as an input device, and 206 denotes a liquid crystal display as a display device. A liquid crystal controller 208 generates display data by controlling an electronic circuit on the main body substrate 203. Display data generated by the liquid crystal controller 208 is sent to the modulator 200 as first category information, modulated, converted into electromagnetic waves (radio waves) from the transmitting antenna 209, and propagated through space. The electromagnetic wave signal transmitted from the transmitting antenna 209 is received by the receiving antenna 210, demodulated into display data by the demodulator 202, sent to the liquid crystal driver 201, and displayed on the liquid crystal display 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 it is possible to arrange the modulator 200 as a signal transmission unit, the transmission antenna 209, the demodulator 202 as a reception unit, and the reception antenna 210 as shown in FIG. It is.

  As 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. In this way, if a signal is sent through a wired path to synchronize the modulator / demodulator, synchronization detection for synchronization is unnecessary on the demodulator side, and the circuit can be simplified. With the recent improvement in semiconductor device manufacturing technology, it is possible to simplify and incorporate a high-frequency wireless transmission modem in this manner at a low cost and high practicality.

  FIG. 3 is a block diagram showing more details of the information transmission method according to the present invention and an embodiment of an electronic device using the information transmission method. 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 as data in parallel for each word from the normal video memory in units of pixels, 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 parallel-to-serial conversion circuit 304, the horizontal synchronization signal 320, and the vertical synchronization signal 321, generates a packet, and gives a preamble for synchronization necessary for communication such as timing of synchronous detection to the packet. 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 generator 309 is frequency-divided by the frequency divider 326 and converted to a low frequency and transmitted to the receiving side as the second category information via the wired path 340.

  The reception antenna 311 receives the electromagnetic wave signal transmitted from the transmission antenna 310, is amplified by the preamplifier 312, removes unnecessary band components by the bandpass filter 313, and is input to the demodulator 314. The demodulator 314 multiplies the frequency of the frequency divider 326 output sent as the second information by the wired path 340 by the PLL 315, restores the carrier frequency, supplies it to the demodulator 314, and demodulates the electromagnetic wave signal. 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 a liquid crystal display, that is, a conventional example diagram. 11 display data signals 1116, horizontal synchronization signals 1114, vertical synchronization signals 1118, and signals corresponding to the X clock signal 1115 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 interfere with 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 wireless communication, the transmitter-side modulator and the receiver-side demodulator need to handle the same carrier frequency, and the carrier oscillator frequency between transmission and reception is required to have high accuracy. This error appears as direct communication quality degradation. However, according to the above-described configuration of the present invention, the modulator 308 and the demodulator 314 use the same carrier wave generator 309 signal, so that no error occurs. The accuracy of the carrier wave transmitter 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 generator 309 may be directly sent 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 restore the same carrier wave as the output of the carrier wave oscillator 309 by dividing and transmitting the signal with the frequency reduced as in the above configuration and multiplying by the PLL.

  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 the 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 so that the minimum transmission power that can ensure sufficient communication quality on the reception side of the electromagnetic wave signal is obtained. As a result, the communication quality can be maintained with much less radiated power than the unnecessary radiated power generated from the 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 generated electromagnetic field 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 by trial production at the initial stage of device design. Since this is done automatically, there is a significant reduction in development man-hours. Such a method of the present invention for controlling the transmitting side and maintaining the new communication quality is different from the conventional wireless communication technique in which the receiver sensitivity (gain) is controlled by providing an AGC (automatic gain control) circuit on the receiving side. The concept is greatly different, and the system configuration is simplified and unnecessary radiation can be suppressed to a minimum.

  By adopting the above configuration, high-speed and large-scale display data can be wirelessly displayed on the display body, and power consumption, wiring position restrictions, EMI countermeasures, and reliability assurance that have become more apparent as the display body becomes larger Various problems caused by wired transmission can be eliminated.

  In the third embodiment, the horizontal and vertical synchronization signals of the display body are packetized and transmitted as first category information via the electromagnetic wave path 329. However, the output of the liquid crystal controller 303 is directly transmitted to the logic circuit 318 as second category information. You may transmit on a track. FIG. 4 is a block diagram showing a simplified main part of the information transmission system and the electronic device using the same according to the present invention, and shows a simplified embodiment of the logic circuit 307 and the synchronization circuit 316 based on the above concept. . The names and functions of the blocks with the same numbers as in FIG. 3 are the same as those in FIG. Since the horizontal synchronization signal 320 and the vertical synchronization signal 321 are sent to the reception side as the second category information by wire, if the transmission packet is transmitted in synchronization with these synchronization signals, the reception side knows the packet synchronization for knowing the start of the packet. Detection or the like is unnecessary, and the synchronization circuit 316 and the logic circuit 307 are unnecessary or extremely simple.

  FIG. 5A 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 the modulator 308 and the demodulator 314 of the third and fourth embodiments in more detail. The carrier wave oscillator 502 is a rectangular pulse oscillator corresponding to the carrier wave oscillator 309 of the third 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. The multiplier 501 may be an exclusive OR circuit because both the input data 503 and the output of the carrier wave oscillator 502 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 functions as a multiplier. In addition, since the communication distance is very close, 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 operates as follows. The reception signal received by the reception antenna 311 is amplified to remove unnecessary bands, and then 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 high-frequency component by the low-pass filter 506. The demodulated signal 509 is demodulated. The low-pass filter 506 removes the high-frequency component (thin pulse component generated by a slight phase shift difference between the received signal 507 and the reproduction clock waveform of the PLL 508) from the output of the multiplier 505 and outputs it as a demodulated signal 509. The PLL 508 reproduces the carrier frequency before frequency division based on the output of the carrier wave transmitter 502 that has been frequency-divided by the frequency divider 507 transmitted as a second category information and reduced in frequency.

  6A to 6C show time charts of the modulator 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 diagram of FIG. 6 is viewed as a digital circuit, the modulator is an exclusive OR, and if viewed as an analog value having a value of ± 1, the modulator is a multiplier.

  FIGS. 3D to 3F are time charts of the double tone circuit according to the fifth 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 slight order of the received signal 507 and PLL 508 output from this signal. The high frequency component caused by the phase difference is removed, and the demodulated signal 509 is restored.

  As apparent from FIG. 6, the carrier clock FIG. 6 (a) and the recovered clock FIG. 6 (e) do not work well if the frequency is different or the phase is shifted. Conventional wireless communication has separate transmitters and receivers with high-accuracy transmitters to minimize errors. According to this configuration of the present invention, since the recovered clock on the receiving side is based on the carrier oscillator 502 on the transmitting side, a recovered clock having the same frequency can always be secured, so that no error due to stability or frequency accuracy of the transmitting frequency occurs. . A very stable circuit can be constructed even with an inexpensive transmission circuit.

  If the time chart of FIG. 6 is viewed as a digital circuit, the modulator is an exclusive OR, and if it is viewed as an analog value taking a value of ± 1, the modulator is a multiplier. Since the wireless signal transmission used in the present invention has a short communication distance and can secure communication quality with a sufficiently high S / N ratio, the signal can be amplified to a level that can be regarded as a digital value. In this case, the amplified signal level is increased to a 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. Short and low load does not increase power consumption. Even if the received signal is an analog level that is not amplified to a logical value level, the PLL 508 output is a rectangle (with a value of ± 1), so multiplication can be realized with a simple switch circuit. That is, two amplifiers having the same absolute value of amplification degree and opposite polarity are prepared for the received signal, the inverting amplifier output is selected by the switch when the logic level of the PLL 508 output is 1, and the normal amplifier output is selected when the logic level is 0. Can be realized. A circuit having such a structure may be used as the multiplier 507.

  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. 5B is a block diagram of the main part of the embodiment of the electronic device according to the present invention, and another example of the modulator 308 and the demodulator 314 of the third and fourth embodiments will be described in more detail. FIG. In the fifth embodiment, the BPSK modulation is simplified, but in the sixth 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 third or fourth embodiment. In QPSK, transmission is assigned with 2 bits per symbol (ie, data bit 1 510 and bit 2 511), encoded and transmitted. That is, the phase shift amount is encoded and modulated as shown in Table 1 for transmission with respect to the reference clock. 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 1 510 and the data bit 2 511.

  6 (g) to 6 (j) are time charts showing the operation of each part of the modulator shown in FIG. 5 (b). Bit 1 510 (FIG. 6 (h)) and bit 511 (FIG. 6 (i)) of the transmission data are encoded by the encoder 512, and the carrier wave (FIG. 6 (g)) oscillated by the carrier wave oscillator 513 is converted into the phase shifter 514. Is used to control whether or not 90 ° phase shift is performed, and further, whether or not the carrier wave is inverted (180 ° phase shift) by the multiplier 515, and finally the transmission signal 515 that is QPSK modulated (FIG. 6 (j)) Is output.

  The frequency divider 517 corresponds to the frequency divider 326 according to the third or fourth embodiment, and the PLL 520 corresponds to the PLL 315 according to the third or fourth embodiment. The recovered clock output from the PLL 520 is multiplied by the received signal 518 (FIG. 6 (k)) by the first multiplier 519 and transmitted to the first low-pass filter 523 to remove the high-frequency component and transmitted to the discrimination circuit 525. At the same time, the received signal 518 is also multiplied by a pulse train (FIG. 6 (o)) obtained by shifting the recovered 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 524 is multiplied. Thus, the high frequency component is removed and transmitted to the discrimination circuit 525. The determination circuit 525 demodulates the received signal by calculating the transmission data from the outputs of the first and second low-pass filters (FIGS. 6 (n) and (q)).

  According to the above configuration, the speed of data transmission can be increased without increasing the occupied band of the transmission signal. Also, since the modem can be realized by a simple digital circuit, it can be incorporated in a semiconductor chip, and the increase in cost and power consumption can be ignored. Since the recovered clock required on the receiving side is based on the same transmitter as that on the transmitting side, there is no error due to the accuracy of the clock frequency between transmission and reception. Stable data transmission is possible even with an inexpensive transmitter. Since the frequency of the carrier wave transmitter 513 always follows the receiving side even if the transmitting side changes unilaterally, for example, in an electronic device such as a wireless communication device, a frequency that does not disturb the communication channel according to the communication channel is set. You can change it unilaterally. (This is the same in any of the third, fourth, and fifth embodiments.) That is, it is possible to remarkably easily prevent interference and interference with the intended communication of an electronic device such as a communication device.

  FIG. 7 is a block diagram showing the main part of an embodiment of another information transmission method and electronic apparatus according to the present invention. The functions of the CPU 701, video memory 702, and liquid crystal controller 703 are the same as those described in the third and fourth embodiments. Display data 725, horizontal synchronization signal 723, and vertical synchronization signal 724 generated by the liquid crystal controller 703 are The code is multiplexed by the code multiplexing circuit 704 with the spreading code generated by the spreading code generator 705. In this embodiment, since parallel data is code-multiplexed as follows, parallel / serial conversion by the parallel / serial conversion circuit 304 of the embodiment 3 or 4 is not necessary, and therefore the inverse conversion, that is, the serial / parallel conversion circuit 317 is also unnecessary. It is. Code sets that are orthogonal to each other are often used as spreading codes. 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 spread code generator 705 (exclusive OR) is added, and the code is multiplexed. The multiplexed signal is modulated by the modulator 707 with the carrier wave generated by the carrier wave transmitter 706 and transmitted through the propagation path 726 by the electromagnetic wave signal as the first category information from the transmitting 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 generator 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 separates the multiplexed data by calculating the correlation with the spreading code for multiplexing generated by the spreading code generator 716 by the despreading circuit 714. The logic circuit 717 generates a display data signal 718, a horizontal synchronizing signal 719, a vertical synchronizing signal 720, and an X driver clock signal 721 for driving the liquid crystal driver from the detected display data and various timings, and sends them to the liquid crystal display for display. Do.

  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 of the demodulator and the timing for despreading can be generated based on, for example, a 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. Particularly 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, in despreading, the matched filter has a complicated circuit, but the response time is short and synchronization is unnecessary. On the other hand, when the correlator is used for despreading, despreading cannot be performed unless synchronization is achieved. Usually, since the calculation is performed by trial and error by sliding one chip at a time, despreading cannot be performed immediately. However, according to the above-described configuration of the present invention, the synchronization information of the correlator is transmitted by wire as the second category information, so that it is not necessary to perform synchronization acquisition and sliding, and despreading is possible with a very simple circuit.

  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 perform simultaneous communication in several different places where signal transmission / reception is necessary. In addition, it is possible to increase the diffusion gain by diffusion, and in particular, it is effective in improving the anti-interference and interference characteristics with the original intended radio wave in a device that generates radio waves such as a mobile phone. In addition, since synchronization information and carrier frequency information are transmitted as wires as the second category information, it is easy to match the carrier frequency between transmission and reception, and the accuracy of the carrier transmitter is not required. The synchronization acquisition for despreading is also unnecessary, and the despreading circuit can be greatly simplified and the feasibility is high.

  FIG. 8 is a block diagram showing the main part of an embodiment of the data transmission and electronic device according to the present invention. The functions of the CPU 801, video memory 802, and liquid crystal controller 803 are the same as those described in the third and fourth embodiments. The display data 825, horizontal synchronization signal 823, and vertical synchronization signal 824 generated by the liquid crystal controller 803 are converted into serial signals by rearranging and rearranging data such as parallel conversion, preamble assignment, and packet construction by the logic circuit 805. The primary modulator 805 modulates the pulse train generated by the pulse generator 806 to this signal. For primary modulation, pulse position modulation or biphase pulse modulation 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 spread modulated pulse train is radiated as an electromagnetic wave by the transmitting antenna 810 after being 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. The radiated electromagnetic field is not a sine wave modulated but a very thin pulse train. Communication using short pulses and wide-band pulses in this manner is called an impulse radio (Umpulse Radio) or UWB (Ultra Wide Band) communication system.

  The radiated electromagnetic wave is received by the receiving antenna 811 through the wireless 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. The 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). . The logic circuit 818 displays a display data signal 819 for driving the liquid crystal driver based on the display data detected by the demodulator 817 and the horizontal synchronization signal 823 sent from the transmission side through the wired path 827 as the second category information. The horizontal synchronizing signal 820, the vertical synchronizing signal 821 and the X clock signal 822 of the X driver are generated and sent to the liquid crystal display for display. If there is such reference timing information on the receiving side, the configuration of the correlator 814 and the logic circuit 818 is much simplified 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, it is easy to set a link budget that can ensure sufficient communication quality even in an electronic device that generates a strong radio wave, which is the original purpose, such as a mobile phone. 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 in the electronic device, they may interfere with each other and cause serious interference. Can be avoided by methods such as synchronizing the frequency, 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 the digital circuit that handles the pulse, and the circuit element can be easily integrated into an IC. By adopting a short pulse, it is possible to increase the spreading gain in the time direction and improve the anti-interference and interference characteristics with radio waves emitted as an original function of the electronic device, as well as the multi-channel as a communication transmission path.

  FIG. 9 is a block diagram showing a 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. The image sensor 901 is activated by the horizontal synchronizing signal 920 and the vertical synchronizing signal 921 generated from the control circuit 902 and outputs imaged 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 transmission antenna 907 as an electromagnetic wave.

  The 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 is demodulated by removing unnecessary out-of-band signals by the bandpass filter 910. Input to the device 912. The PLL 915 divides the carrier wave transmitted from the carrier wave generator 906 by the frequency divider 904, multiplies the output of the frequency divider 904 sent through the wired path 923 as the second category information to the carrier wave frequency, generates a carrier wave, and demodulates it. Input into the instrument. 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 the 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, but the method of transmitting information related to the activation to the image sensor control circuit 902 is preferably transmitted by wire as the second category information because the bit rate is low, but wirelessly transmitted. You can also In that case, both the CPU side and the image sensor side have transmission / reception means for bidirectional communication. In particular, in a mobile phone having a clamshell structure, the image sensor and the display element are placed close to each other and are often on the opposite side of the CPU side. The captured image data is sent to the CPU side for processing and then displayed on the display element side. Sent back. Such a case can be realized by adopting a configuration in which Example 3 or Example 3 is placed back to back.

  Various configurations caused by wired transmission such as power consumption, wiring position restrictions, EMI countermeasures, reliability assurance, etc., which have become more apparent with the above configuration, that is, by making data transmission from the imaging element wireless You can eliminate the problem. On the receiving side, since the synchronization timing necessary for demodulation is sent by wire, there is no need to acquire synchronization, and the circuit can be greatly simplified. In addition, since the carrier wave generated by the same transmission source between the transmission and reception is used as a reference, the frequency accuracy required for the carrier wave oscillator is remarkably relaxed, which has a great effect on cost reduction and feasibility.

  FIG. 10 is a diagram illustrating an 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. Reference numerals 1012 and 1013 represent semiconductor chips, and exemplify a case where data transmission is performed from the chips 1012 to 1013. Reference numeral 1001 denotes a circuit element having (generating) a plurality of data to be transmitted in the semiconductor chip 1012, and reference numeral 1002 is a circuit element receiving the data in 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 third or fourth embodiment and code multiplexing as in the seventh embodiment. Modulator 1004 receives the output of multiplexing circuit 1002, modulates it, and transmits it as an electromagnetic wave signal by transmitting antenna 1010. The control circuit simultaneously generates multiplexing, synchronization of synchronization and other timing signals and carrier waves. Signals serving as a reference for a carrier wave are also generated using the methods described in the third to ninth 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 demodulated by the demodulator 1008 and returned to the original multiplexed signal by the demultiplexing circuit 1007 and sent to the circuit element 1005 that receives the signal. It is done. The control circuit 1006 receives multiplexing, modulation synchronization and other timing signals and carrier wave reference signals from the transmission-side control circuit 1003, synchronizes demodulation and demultiplexing, and restores the carrier wave used by the demodulator 1008. By receiving these signals, the demultiplexing and demodulation circuits can be greatly simplified, and the requirement for the accuracy of the transmission frequency is greatly eased.

  The transmission / reception antenna 1010 or 1010 may be formed on the semiconductor chips 1012 and 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. 13 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. The home theater includes an image display unit 1305, a tuner decoder unit 1301, and a speaker unit 1324. An image display unit 1305 includes an image display device and receives and displays an image signal. The speaker unit 1324 is generally composed of a plurality of speakers 1311, 1312, 1313, 1314, and 1315 and a drive portion 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. 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 a command from the control circuit 1320. Data output from the reproduction unit 1302 is multiplexed for each image and audio channel by a multiplexing circuit 1303. Multiplexing is performed by multiplying the spread code generated by the spread code generator 1321 for each channel in synchronism with the reference signal generated by the control circuit 1320 and adding the analog signal. The multiplexed data is modulated by the modulator 1309 and transmitted from the transmitting antenna 1317 as the first category information. A carrier wave oscillator 1304 multiplies based on a reference signal generated by the control circuit 1320 to generate a carrier wave. A reference signal generated by the control circuit 1320 is transmitted as second category information from the wired path 1316 to the image display unit 1305 and the speaker unit 1324. Image data, text data, or audio data propagates through the wireless propagation path 1319 as first category information, is received by the receiving antenna 1318, is demodulated by the demodulator 1307, is despread by the despreading circuit 1308, and is demultiplexed to demultiplex, and only the image signal is received. And the extracted image data is stored in the display unit storage 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 in 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. A multiplexing code generator 1322 used for despreading generates a spreading code in synchronization with a reference signal sent as 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 having a high frequency accuracy required for the carrier wave transmitter is not required. Also, since the despreading code can be synchronized, the despreading circuit can be remarkably simplified.

  By adopting the above configuration, the tuner decoder unit has conventionally required a star-shaped wiring for the speaker unit and the image display unit, and the complicated protocol for parallel-to-parallel conversion and high-speed transmission has been remarkably simplified. It becomes. Even when all signals are transmitted wirelessly, the circuit and protocol are remarkably simplified and the practical effect is great.

  The present invention is not limited to the above-described embodiments, 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.

The figure which shows one Example of the information transmission system of this invention. 1 is a diagram showing an embodiment of an electronic device of the present invention. The block diagram which shows the one Example of the electronic device using the detail and the information transmission system of this invention. The block diagram which shows the other Example of the information transmission system of this invention, and an electronic apparatus using the same. The figure which explains in more detail the modulator and demodulator of Example 3 and Example 4 of the electronic device concerning this invention. FIG. 6 is a time chart detailing Example 5 and Example 6 according to the present invention. The block diagram of the principal part of the Example of the other information transmission system concerning this invention and an electronic device. The block diagram of the principal part of further another Example of the data transmission concerning this invention and an electronic device. The block diagram of the principal part of the further another Example of the data transmission and electronic device concerning this invention. The block diagram of the principal part of further another Example of the data transmission concerning this invention and an electronic device. 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. The block diagram of the use part of another Example for the data transmission and electronic device concerning this invention.

Explanation of symbols

107, 340, 727, 827, 923, 1014, 1316:... Wired path 108, 211, 329, 726, 826, 922, 1015, 1319:... Wireless propagation paths 301, 701, 501, 518, 701 , 801, 918: CPU
302, 702, 502, 517, 702, 802, 917: Video memory 208, 303, 703, 503, 703, 803: Liquid crystal controller 102, 200, 308, 707, 905, 1004, 1309: ... Modulators 110, 209, 310, 708, 810, 907, 1010, 1317: ... Transmit antennas 111, 210, 311, 709, 811, 908, 1011, 1318: ... Receive antennas 106, 202 314, 712, 817, 912, 1008, 1307: ... demodulator 805: ... primary modulator 807, 1303: ... diffusion modulator 206, ... ... liquid crystal display 901: ... Image sensors 309, 502, 513, 706, 906, 1304, 1306:... Carrier wave oscillators 326, 507 517,713,904: ... divider 315,508,520,715,915: ··· PLL
501, 505, 515, 519, 521:... Multiplier 514, 522:... + 90 ° phase shifter 705, 716, 808, 816, 1321, 1322:. Code multiplexing circuits 714, 1308: ... despreading circuits 806, 813: ... pulse generator 809: ... pulse shaping circuit 814: ... correlator

Claims (13)

  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 performed simultaneously. Characteristic information transmission method.   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, and the wireless communication of the first category information and the wired communication of the second category information are performed simultaneously. Features electronic equipment. In claim 2,
The electronic device according to claim 2, wherein the second category information includes synchronization information related to wireless communication of the first category information.   3. The electronic device according to claim 2, wherein the second category information includes information indicating a reception state of the first category information and is transmitted from a reception side of the first category information to a transmission side. In claim 3 or 4,
The electronic device characterized in that the first category information includes any of image data, text data, and audio data. In any of claims 3 to 5,
An electronic apparatus comprising: 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. In claim 6,
The electronic device, 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. In claim 6,
The electronic device, wherein the electromagnetic wave conversion unit performs spread spectrum modulation, the electromagnetic wave restoration unit performs spectrum reverse diffusion, and synchronization information of the electromagnetic wave conversion unit and the electromagnetic wave restoration unit is transmitted by wire. In claim 6,
The electromagnetic wave conversion unit modulates 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. machine. Any one of claims 2 to 9,
A storage unit that stores the first category information; a display body that displays the first category information; and 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; An electronic device comprising: a display body driving section that drives the display body based on the first category information read by the display control section. Any one of claims 2 to 9,
An electronic apparatus comprising: an imaging element; and an imaging control unit that reads and outputs an image signal captured by the imaging element as the first category information. The electronic apparatus according to claim 2, wherein information transmitted between an electronic circuit on an integrated circuit and the outside of the integrated circuit is wirelessly transmitted as first category information. The electronic device comprising: a display unit, a speaker unit, image data to be displayed on the display unit, and a data source unit for generating acoustic data for driving the speaker unit. An electronic apparatus characterized by wirelessly transmitting the image data and sound data transmitted between a speaker unit and a data source unit as first category information.

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