JP2006148363A - Communication method, transmitter, receiver, and communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication method improving workability under the situation of installation, or the like to a vehicle, suppressing an increase in the weight of the vehicle, and solving the problem wherein laying space is insufficient, by suppressing an increase in the number of transmission lines for connecting vehicle-mounted devices, and also to provide a transmitter, a receiver, and a communication system. <P>SOLUTION: In the transmitter 20, the input of an asynchronous signal is received by respective input interfaces 21, 21, ... for outputting to first-in first-out circuits 22, 22, .... In the first-in first-out circuit 22, 22, ..., a held signal is outputted to a register circuit 24 via circuits 23, 23, ... for converting the number of bits. In the register circuit 24, each signal receiving input is arranged in a prescribed order, serial data are generated according to the order of the arrangement from the arranged signals, and the generated serial data are transmitted from a transmission interface 25 to the receiver 30. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a communication method for transmitting data from a transmission device to a reception device, a transmission device and a reception device used in the communication method, and a communication system including the transmission device and the reception device, and particularly to realize line saving. The present invention relates to a communication method, a transmission device, a reception device, and a communication system.

  In recent years, various in-vehicle devices such as audio visual devices and navigation devices mounted on vehicles have been increasing, and various in-vehicle systems for connecting these various devices with transmission lines have been proposed and put into practical use. (For example, refer to Patent Document 1).

In-vehicle devices such as navigation devices used in in-vehicle systems are becoming more sophisticated, and signals output from the in-vehicle devices include signals of various standards such as images, audio, and peripheral device control signals. The signals of various standards are transmitted through dedicated transmission lines adapted to the interfaces based on the respective standards.
JP 2002-152244 A

  However, since transmission lines that conform to interfaces of various standards are used, a plurality of transmission lines are required, and the number of the transmission lines increases as the functionality of the in-vehicle device increases. The increase in the number of transmission lines requires a complicated operation under the circumstances such as the connection between the transmission lines and the in-vehicle device, the installation of the in-vehicle device in the vehicle, etc. There is a problem of increase and lack of installation space.

  The present invention has been made in view of such circumstances, and by generating and transmitting serial data in which a plurality of standard signals output from a plurality of standard interfaces are arranged in a predetermined order, the convenience is improved. Communication method capable of improving and suppressing increase in vehicle weight and solving the problem of lack of laying space, transmitter and receiver used in the communication method, and communication system including the transmitter and receiver The purpose is to provide.

  According to a first aspect of the present invention, there is provided a communication method using a transmission device including a plurality of standard input interfaces and transmission interfaces, and a reception device including a plurality of standard output interfaces and reception interfaces, and transmitting data from the transmission device to the reception device. In the communication method of transmitting, the transmitting device forms serial data in which a plurality of standard signals input from each input interface are arranged in a predetermined order, and transmits the formed serial data from the transmitting interface to the receiving device. The receiving apparatus outputs the serial data received from the receiving interface from the output interfaces of a plurality of standards according to the arranged order.

  In the present invention, by generating serial data from a plurality of standard signals, a plurality of standard signals can be transmitted through a single transmission line. Therefore, the convenience of connecting a transmission line to the apparatus is improved. It is possible to improve, suppress an increase in vehicle weight, and solve the problem of insufficient laying space.

  According to a second aspect of the present invention, there is provided a transmission device including a plurality of standard input interfaces and a transmission interface for transmitting data to another device, wherein the plurality of standard signals input from each input interface are arranged in a predetermined order. Means for forming the serial data and means for transmitting the formed serial data from the transmission interface to another device.

  In the present invention, by generating serial data from a plurality of standard signals, a plurality of standard signals can be transmitted by a single transmission line, so that the transmission line can be saved and installed. It is possible to solve the problem of lack of space. Moreover, the weight reduction accompanying a wire-saving can be implement | achieved and when it uses as a vehicle-mounted apparatus, it is possible to suppress the increase in a vehicle weight. Further, as the line is reduced, the transmission line as a whole can be thinned, which makes it easier to handle, so that it is possible to improve the convenience of connecting the transmission line to the apparatus.

  According to a third aspect of the present invention, there is provided a transmission device including an input interface of a plurality of standards and a transmission interface for transmitting data to another device, each of which holds a signal output from each input interface, and the held signal is predetermined. A plurality of first-in first-out circuits that output at intervals, and a number circuit that arranges each signal output from the plurality of first-in first-out circuits in a predetermined order, and the transmission interface is arranged in the number circuit The signal is configured to be transmitted as serial data in the arranged order.

  In the present invention, by generating serial data from a plurality of standard signals, a plurality of standard signals can be transmitted by a single transmission line, so that the transmission line can be saved and installed. It is possible to solve the problem of lack of space. Moreover, the weight reduction accompanying a wire-saving can be implement | achieved and when it uses as a vehicle-mounted apparatus, it is possible to suppress the increase in a vehicle weight. Further, as the line is reduced, the transmission line as a whole can be thinned, which makes it easier to handle, so that it is possible to improve the convenience of connecting the transmission line to the apparatus. In addition, since serial data is generated by a first-in first-out circuit and a number circuit, complicated processing by various circuits is not required, so that high-speed processing can be realized and delay time can be shortened.

  A transmitting apparatus according to a fourth invention is characterized in that, in the third invention, the first-in first-out circuit is configured to output a dummy signal when the signal to be output is not held.

  In the present invention, by inserting a dummy signal, it is possible to maintain the arrangement order of signals arranged as serial data, so that it is possible to prevent reading errors due to synchronization deviation on the device side receiving serial data. Even when a standard signal having a slow transfer speed at the time of input is transmitted as serial data, it is possible to absorb a speed difference from other standard signals.

  A transmission device according to a fifth aspect of the invention is the transmission device according to the third or fourth aspect, wherein a signal of a plurality of bits is received from the first-in first-out circuit, is converted into a signal having a bit number different from the received bit number, and is output to the digit circuit. A bit number conversion circuit is further provided, and the first-in first-out circuit is configured to output a signal of a plurality of bits to the numeric value circuit via the bit number conversion circuit.

  By converting the number of bits of parallel data in the bit number conversion circuit, a standard signal with a large number of signals to be transmitted, that is, a standard signal with a higher transfer speed at the time of input is assigned a larger number of bits. Since the speed difference can be absorbed, efficient transmission can be realized.

  According to a sixth aspect of the present invention, there is provided a receiving device including an output interface of a plurality of standards and a receiving interface for receiving data from another device, and means for receiving serial data from the receiving interface, and arranging the received serial data And a means for outputting from a plurality of standard output interfaces in accordance with a predetermined order.

  In the present invention, serial data generated from a plurality of standard signals can be received and output by outputting the received serial data from a plurality of standard output interfaces according to the arranged order. Therefore, since signals of a plurality of standards can be received by a single transmission line, the transmission line can be saved and the problem of insufficient installation space can be solved. Moreover, the weight reduction accompanying a wire-saving can be implement | achieved and when it uses as a vehicle-mounted apparatus, it is possible to suppress the increase in a vehicle weight. Further, along with the line saving, it is possible to realize the thinning of the entire transmission line, thereby facilitating the handling, and it is possible to improve the convenience when connecting the transmission line to the apparatus.

  A receiving device according to a seventh aspect of the present invention is a receiving device comprising a plurality of standard input / output interfaces and a receiving interface for receiving data from other devices, wherein the receiving interface receives serial data when receiving serial data. Are output in accordance with the order in which they are arranged, and the signals output from the reception interface are held in accordance with the order in which they are arranged, and each predetermined number of bits in accordance with the order in which they are arranged. A numerical circuit that outputs the divided signals, and a plurality of first-in first-out circuits that respectively hold the signals that are output separately from the numerical circuits and output the held signals to the output interfaces that are associated in advance. It is characterized by providing.

  In the present invention, the received serial data is output from an output interface corresponding to each standard according to the arranged order, thereby receiving serial data generated from signals of a plurality of standards, and the received serial data Output as a signal corresponding to each standard, so that signals of multiple standards can be received by a single transmission line, and the transmission line can be saved, so there is a problem of insufficient installation space. It can be resolved. Moreover, the weight reduction accompanying a wire-saving can be implement | achieved and when it uses as a vehicle-mounted apparatus, it is possible to suppress the increase in a vehicle weight. Further, along with the line saving, it is possible to realize the thinning of the entire transmission line, thereby facilitating the handling, and it is possible to improve the convenience when connecting the transmission line to the apparatus. In addition, since the processing for extracting the signals of each standard from serial data is performed by a simple circuit, complicated processing by various circuits is not required, so high-speed processing can be realized and delay time can be shortened. It is.

  According to an eighth aspect of the present invention, in the seventh aspect, the first-in first-out circuit is configured to discard the dummy signal when the held signal includes a dummy signal.

  In the present invention, when serial data including a dummy signal is received, the dummy signal is discarded, so that the arrangement order is maintained by inserting the dummy signal even when transmitting a standard signal whose transfer amount is a predetermined value or less. Therefore, it is possible to prevent a reading error due to a synchronization error.

  A communication system according to a ninth invention transmits serial data from a transmission device according to the second invention, a reception device according to the sixth invention, and a transmission interface included in the transmission device to a reception interface included in the reception device. And a transmission line.

  In the present invention, the transmission apparatus can transmit a plurality of standard signals through a single transmission line by generating serial data from a plurality of standard signals, thereby reducing the number of transmission lines. It is possible to solve the problem of insufficient laying space. Moreover, it is possible to reduce the weight associated with the line saving. Furthermore, since the transmission line can be thinned as the whole line is saved, handling is facilitated, and the convenience in connecting the transmission line to the apparatus can be improved.

  A communication system according to a tenth aspect of the present invention is the transmission device according to any one of the third to fifth aspects, the reception device according to the seventh or eighth aspect, and the reception from the transmission interface included in the transmission device. And a transmission line for transmitting serial data transmitted to a reception interface included in the apparatus.

  In the present invention, the transmission apparatus can transmit a plurality of standard signals through a single transmission line by generating serial data from a plurality of standard signals, thereby reducing the number of transmission lines. It is possible to solve the problem of insufficient laying space. Moreover, it is possible to reduce the weight associated with the line saving. Further, along with the line saving, it is possible to realize the thinning of the entire transmission line, thereby facilitating the handling, and it is possible to improve the convenience when connecting the transmission line to the apparatus. In addition, since serial data is generated by a first-in first-out circuit and a number circuit, complicated processing by various circuits is not required, so that high-speed processing can be realized and delay time can be shortened.

  A communication system according to an eleventh aspect of the invention is characterized in that, in the ninth or tenth aspect of the invention, the transmitting device and the receiving device are in-vehicle devices.

  In the present invention, since the transmission line can be saved, it is possible to solve the problem of insufficient installation space in the vehicle. Moreover, since the weight reduction accompanying a wire saving can be implement | achieved, it is possible to suppress the increase in a vehicle weight.

  The communication method, the transmission device, the reception device, and the communication system according to the present invention are serial data in which a plurality of standard data such as an image signal, an audio signal, and a peripheral device control signal are asynchronously generated and arranged in a predetermined order. Is generated and transmitted.

  With this configuration, signals of a plurality of standards can be transmitted through a single transmission line that transmits serial data. Therefore, the signals of devices that have advanced functions such as audio visual devices mounted on vehicles can be transmitted. When applied to a transmitting apparatus and a receiving apparatus that transmit and receive data, the transmission line can be saved, and an excellent effect can be obtained, for example, the problem of insufficient installation space can be solved. Moreover, the light weight accompanying a wire saving can be implement | achieved and there exists an outstanding effect, such as being able to suppress the increase in a vehicle weight. Furthermore, it is possible to realize thinning of the transmission line as a whole with line saving, which makes it easier to handle, so it is possible to improve convenience when connecting the transmission line to the device, etc. Excellent effect.

  Further, in the present invention, the transmission device holds the signals input from the respective input interfaces, and outputs a plurality of first-in first-out circuits that output the held signals at predetermined intervals, and the respective signals output from the plurality of first-in first-out circuits. By generating serial data with a numeric circuit arranged in a predetermined order and a transmission interface that transmits signals arranged in the numeric circuit according to the arranged order, complicated processing by various circuits can be performed. Since it is not necessary, high speed processing can be realized and the delay time can be shortened. In addition, since the signal output timing can be adjusted by the first-in first-out circuit, it is possible to synchronize the asynchronous signals.

  Further, in the present invention, by determining the number of bits to be arranged according to each standard, a signal having a larger number of signals to be transmitted, that is, a signal having a higher transfer speed at the time of input is assigned a larger number of bits. Since the difference in speed between the respective standards can be absorbed, an excellent effect is achieved such that efficient transmission can be realized.

  Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof.

  FIG. 1 is a block diagram showing a configuration of a communication system according to the present invention. In FIG. 1, reference numeral 1 denotes a vehicle such as an automobile. The vehicle 1 includes a DVD (digital multipurpose disc) playback device that outputs an image signal that forms a 24-bit color image, and an MD (minidisc) playback that outputs an audio signal. A signal output device 10 such as a device and a transmission device 20 that transmits signals in accordance with various standards output from the signal output device 10 are mounted. One end of a transmission line 2 using a pair of differential wires (differential twisted pair cable) as one line is connected to the transmission device 20, and the other end of the transmission line 2 is connected to the transmission device 20 from the transmission device 20. A receiving device 30 for receiving the transmitted signal is connected. The receiving device 30 outputs signals of various standards received via the transmission line to a signal input device 40 such as a liquid crystal monitor or a speaker that accepts input of signals corresponding to the respective standards.

  Note that the signal output device 10 that outputs a signal to the transmission device 20 may be a device that outputs signals of a plurality of standards by a single device, or may be a plurality of devices that output signals of different standards. Similarly, the signal input device 40 that accepts input of signals of various standards output from the receiving device 30 accepts input of signals of different standards even if it is a single device that accepts input of signals of a plurality of standards. A plurality of devices may be used.

  Further, the signal output device 10 and the transmission device 20 may be formed so as to be incorporated in one housing or may be formed as different housings. The same applies to the receiving device 30 and the signal input device 40.

  Furthermore, the transmission line 2 is not limited to a pair of differential lines, and various transmission lines such as a coaxial cable and an optical cable can be used.

  As a standard of a signal output from the signal output device 10, not only the above-described image signal and audio signal, but also a signal for outputting to a weak radio based on a standard such as Bluetooth, a signal for controlling the weak radio Furthermore, various standard signals such as a control signal for controlling various peripheral devices used as the signal input device 40 and a state signal indicating the state of the signal output device 10 can be exemplified.

  2 and 3 are block diagrams showing configurations of various devices used in the communication system according to the embodiment of the present invention. FIG. 2 mainly shows the transmission device 20, and FIG. 3 mainly shows the reception device 30. Is shown. The transmitting device 20 receives a plurality of standard signals output from the signal output device 10, and receives a plurality of input interfaces 21, 21,... And a plurality of input interfaces 21, 21,. Are provided with first-in first-out circuits (FIFO circuits) 22, 22,..., And a plurality of bit number conversion circuits 23, 23,. In the following description, when the input interfaces 21, 21,..., The first-in first-out circuits 22, 22,... And the bit number conversion circuits 23, 23,. Input interface 21b, third input interface 21c and fourth input interface 21d, first first-in first-out circuit 22a, second first-in first-out circuit 22b, third first-in first-out circuit 22c and fourth first-in first-out circuit 22d, first bit number conversion circuit 23a, These are expressed as a 2-bit number conversion circuit 23b, a third bit number conversion circuit 23c, and a fourth bit number conversion circuit 23d.

  In each of the input interfaces 21, 21,..., A signal that has received an input is output to each first-in first-out circuit 22, 22,. The signals output from the input interfaces 21, 21,... To the first-in first-out circuits 22, 22... Are asynchronous and different standard signals. For example, the second input interface 21b outputs a 24-bit signal, which is an image signal received as parallel data, to the second first-in first-out circuit 22b.

  In each of the first-in first-out circuits 22, 22,..., The signals received from the input interfaces 21, 21,... Are respectively held, and the held signals are based on a synchronization signal output from a synchronization signal output circuit (not shown). .. Are output to the bit number conversion circuits 23, 23,... At a predetermined interval. The input intervals of signals received by the input interfaces 21, 21,... Are in accordance with the respective standards, and are therefore set uniquely for each of the input interfaces 21, 21,..., 13.5 MHz, 50 MHz, and 100 MHz. These are asynchronous signals. However, the signals output from the first-in first-out circuits 22, 22,... To the bit number conversion circuits 23, 23,... At a timing based on a synchronization signal such as 80 MHz that is simultaneously output to the first-in first-out circuits 22, 22,. Is output. In the first-in first-out circuit 22, 22,..., When it is detected that a signal to be output is not held when the signal is output, a dummy signal having the number of bits to be output is output. For example, the second first-in first-out circuit 22b outputs a 24-bit signal received as parallel data to the second bit number conversion circuit 23b based on the synchronization signal.

  The bit number conversion circuits 23, 23,... Convert the signals received from the first-in first-out circuits 22, 22,... Into signals having a number of bits different from the received number of bits and output the signals to the register circuit (latch circuit) 24. To do. For example, in the second bit number conversion circuit 23b, a 24-bit signal received as parallel data is divided by 10 bits and output to the numeric circuit 24 as 10-bit parallel data. Note that the bit number conversion setting is set according to various factors such as signal content, relationship with other signals, overall bandwidth, etc., so depending on the situation, the bit number of the input signal and the number of output bits May match.

  As described above, the bit number conversion circuits 23, 23,... Have a function of outputting various signals received from the input interfaces 21, 21,... With the number of bits corresponding to the respective transfer speeds. From the conversion circuits 23, 23,..., A signal having the converted number of bits is output as a signal of a channel assigned to each. For example, the first bit number conversion circuit 23a outputs the first channel signal to the register circuit 4 bits at a time, and the second bit number conversion circuit 23b outputs the second channel signal 10 bits to the register circuit. 24, output from the third bit number conversion circuit 23c as a third channel signal bit by bit to the placement circuit 24, and from the fourth bit number conversion circuit 23d as the fourth channel, 1 Each bit is output to the register circuit 24. In the case of such a channel configuration, for example, an audio signal is assigned to the first channel, an image signal is assigned to the second channel, and a control signal is assigned to the third channel and the fourth channel.

  The number of bits that is the unit of output set for each channel corresponds to the transfer rate of each standard, and the higher the transfer rate, that is, the channel corresponding to the signal with a large amount of transmission per unit time, the output A large value is set for the number of bits as a unit to be performed.

  The register circuit 23 has a holding unit for arranging and holding a predetermined number of signals such as 16 bits, and the holding unit is set to each output from each first-in first-out circuit 22, 22,. Each signal having the same number of bits is arranged in a predetermined order. Specifically, in the holding units from the first bit to the fourth bit, signals for 4 bits received from the first first-in first-out circuit 22a are arranged, and the holding units from the fifth bit to the 14th bit are arranged. The 10-bit signal received from the second first-in first-out circuit 22b is arranged, the 1-bit signal received from the third first-in first-out circuit 22c is arranged in the 15th bit holding section, and 16 bits. A signal for one bit received from the fourth first-in first-out circuit 22d is arranged in the eye holding unit. As described above, signals of various standards input from the input interfaces 21, 21,... Are arranged in a predetermined order in the register circuit 23 to form serial data. The serial data to be formed is added with a total of 2 bits for synchronization before and after, and constitutes a frame serving as a transmission unit.

  The signals arranged in the register circuit 24 are output as serial data to the transmission interface 25 according to the arrangement order. The transmission interface 25 receives the serial data received from the register circuit 24 as LVDS (low voltage differential communication: Low). Based on an interface standard such as Voltage Differential Signaling), the signal is transmitted to the receiving device 30 via the transmission line 2. Note that the serial data transmitted from the transmission interface 25 to the reception device 30 is transmitted as continuous data in which frames serving as transmission units are repeated, not intermittent packet units.

  The reception device 30 includes a reception interface 31 that receives serial data that is continuously transmitted. The reception interface 31 specifies a frame that is a transmission unit based on a synchronization bit added to the received serial data. Then, a signal forming serial data constituting the specified frame is output to a register circuit (latch circuit) 32 that holds the data in the arranged order.

  In the register circuit 32, according to the order in which they are arranged, the signal is divided into a predetermined number of bits corresponding to each channel, and the divided signals are converted into respective bit number conversion circuits 33, 33,. Output to.

  Each bit number conversion circuit 33, 33,... Converts the number of bits of the input signal as necessary, and outputs the converted bit number signal to the first-in first-out circuit (FIFO circuit) 34, 34,. To do.

  Each of the first-in first-out circuits 34, 34,... Holds the input signal and outputs the held signals to the associated output interfaces 35, 35,. Further, in each first-in first-out circuit 34, 34,..., If the held signal is a dummy signal, the dummy signal is discarded without being output to the output interfaces 35, 35,.

  In the following description, when the bit number conversion circuits 33, 33,..., The first-in first-out circuits 34, 34,... And the output interfaces 35, 35,. Second bit number conversion circuit 33b, third bit number conversion circuit 33c and fourth bit number conversion circuit 33d, first first-in first-out circuit 34a, second first-in first-out circuit 34b, third first-in first-out circuit 34c and fourth first-in first-out circuit 34d, and second The first output interface 35a, the second output interface 35b, the third output interface 35c, and the fourth output interface 35d are expressed.

  For example, the first bit number conversion circuit 33a accepts a 4-bit signal as the first channel, converts the number of bits as necessary, and outputs it to the first first-in first-out circuit 34a. Further, the first first-in first-out circuit 34a accepts the received signal. Is output to the first output interface 35a. The second bit number conversion circuit 33b receives a 10-bit signal as the second channel, converts the number of bits as necessary, and outputs it to the second first-in first-out circuit 34b. The second first-in first-out circuit 34b further receives the received signal. Output to the second output interface 35b. The third bit number conversion circuit 33c receives a 1-bit signal as the third channel, converts the number of bits as necessary, and outputs it to the third first-in first-out circuit 34c. The third first-in first-out circuit 34c further receives the received signal. Output to the third output interface 35c. The fourth bit number conversion circuit 33d receives a 1-bit signal as the fourth channel, converts the number of bits as necessary, and outputs it to the fourth first-in first-out circuit 34d. The fourth first-in first-out circuit 34d further receives the received signal. Output to the fourth output interface 35d.

  Each of the output interfaces 35, 35,... Corresponds to a standard such as an image signal, an audio signal, etc., and a signal input from each first-in first-out circuit 34, 34,. The signal is output to the signal input device 40 at the timing. That is, the first channel signal received from the first input interface 21a by the transmitting device 20 is output from the first output interface 35a included in the receiving device 30, and the second channel signal received from the second input interface 21b is The third channel signal output from the second output interface 35b and received from the third input interface 21c is output from the third output interface 35c, and the fourth channel signal received from the fourth input interface 21d is Output from the 4-output interface 35d.

  The signal output device 10, the transmission device 20, the reception device 30, and the signal input device 40 are supplied with power from a power supply circuit (not shown).

  Next, signal processing in the transmission apparatus 20 of the present invention will be described. FIG. 4 is an explanatory diagram conceptually showing signal processing of the transmission apparatus 20 of the present invention. FIG. 4A shows signals that the transmission device 20 receives inputs asynchronously as parallel data, and FIG. 4B shows serial data generated based on the parallel data. In the transmitting device 20, as shown in FIG. 4A, a 4-bit signal of the first channel and a 10-bit of the second channel are transmitted from the first-in first-out circuits 22, 22,... Via the bit number conversion circuits 23, 23,. The bit signal, the 1-bit signal of the third channel, and the 1-bit signal of the fourth channel are output to the register circuit 24. The register circuit 24 forms a 16-bit frame, which is a unit of serial data, by arranging the received signals in a predetermined order. The signals arranged in the register circuit 24 are output to the transmission interface 25 according to the arrangement order, and the frames shown in FIG. 4B are repeated by transmitting the frames continuously from the transmission interface 25. Serial data is transmitted from the transmission device 20 to the reception device 30 as the continuous data.

  FIG. 5 is an explanatory diagram conceptually showing signal processing of the transmission apparatus 20 of the present invention. FIG. 5A shows a signal that the second bit number conversion circuit 23b accepts input. FIG. 5B shows a signal of the second channel after the bit number is converted by the second bit number conversion circuit 23b. As shown in FIG. The signal that the second bit number conversion circuit 23b accepts is an image signal that forms a 24-bit color image, and is made up of R (Red) component, G (Green) component, and B (Blue) component color component signals. 8 shows respective 8-digit values indicating gradations classified into 8 bits for each color component. FIG. 5A shows the second bit number conversion circuit 23b with the B component from the 1st bit to the 8th bit, the G component from the 1st bit to the 8th bit, and the R component from the 1st bit to the 8th bit. It shows a state where the input is accepted and held in order. Then, as shown in FIG. 5B, the 1st to 10th bits, that is, the 1st to 8th bits of the B component and the 1st and 2nd bits of the G component are sent to the register circuit 24. It is output as a clock signal. Then, the 11th to 20th bits, that is, the 3rd to 8th bits of the G component and the 1st to 4th bits of the R component are output to the placement circuit 24 as the second clock signal. Furthermore, the 21st to 24th bits and the 2nd bit number conversion circuit 23b receive the input at the next clock from the 1st to 6th bits, that is, the 5th to 8th bits of the R component and the next B component. The first to sixth bit signals are output to the register circuit 24 as the third clock signal. Thereafter, similarly, 10 bits are output from the second bit number conversion circuit 23b to the register circuit 24.

  In the above embodiment, a mode in which a signal is transmitted from a transmission device to a reception device has been described. However, the present invention is not limited to this, and a communication device in which the circuits of the transmission device and the reception device are incorporated in both devices is realized. A form that realizes bidirectional communication may be employed. When used as a communication device that realizes bidirectional communication, a circuit used in both a transmission device and a reception device such as a power supply circuit can be used as a shared circuit, thereby reducing the size of the entire device. It is possible. When used as two communication devices that perform two-way communication, examples of serial data transmitted and received are as follows: from one device to the other, a 24-bit full-color image signal, speaker audio signal, weak wireless device The transmission data and control data of the above, and the control signal of the display / photographing device is set as serial data. In addition, there is a data configuration in which an information signal from a display / photographing device is serial data. Further, in that case, it is possible to input / output signals to / from each communication device in accordance with a communication protocol for bidirectional communication such as IEEE1394, USB, CAN, LIN, and FlexRay.

  Moreover, although the form applied to a vehicle-mounted apparatus was shown in the said embodiment, this invention is not limited to this, It is possible to apply to various communication systems, such as a home network. The present invention is not limited to a car navigation device, and can be applied to various devices such as a DVD playback device, a television receiver, and an audio device.

  Furthermore, in the above-described embodiment, the form in which serial data is generated from a plurality of types of asynchronous data has been described. However, the present invention is not limited to this, and the form in which serial data is generated from a plurality of types of synchronous data is also possible. good.

It is a block diagram which shows the structure of the communication system of this invention. It is a block diagram which shows the structure of the various apparatuses used with the communication system of this invention. It is a block diagram which shows the structure of the various apparatuses used with the communication system of this invention. It is explanatory drawing which shows notionally the signal processing of the transmitter of this invention. It is explanatory drawing which shows notionally the signal processing of the transmitter of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Transmission line 10 Signal output device 20 Transmission device 21 Input interface 22 First-in first-out circuit 23 Bit number conversion circuit 24 Arrangement circuit 25 Transmission interface 30 Reception device 31 Reception interface 32 Arrangement circuit 33 Bit number conversion circuit 34 First-in first-out circuit 35 Output Interface 40 Signal input device

Claims (11)

In a communication method for transmitting data from the transmission device to the reception device using a transmission device including an input interface and a transmission interface of a plurality of standards and a reception device including an output interface and a reception interface of a plurality of standards,
The transmitter is
Forms serial data in which signals of multiple standards input from each input interface are arranged in a predetermined order,
Send the formed serial data from the transmission interface to the receiving device,
The receiver is
A communication method, comprising: outputting serial data received from a receiving interface from an output interface of a plurality of standards according to an arranged order. In a transmission device comprising a plurality of standard input interfaces and a transmission interface for transmitting data to other devices,
Means for forming serial data in which signals of a plurality of standards input from each input interface are arranged in a predetermined order;
Means for transmitting the formed serial data from the transmission interface to another device. In a transmission device comprising a plurality of standard input interfaces and a transmission interface for transmitting data to other devices,
A plurality of first-in first-out circuits for holding the signals output from the respective input interfaces and outputting the held signals at predetermined intervals;
A numerical circuit that arranges each signal output from each of the plurality of first-in first-out circuits in a predetermined order;
The transmission interface is configured to transmit the signals arranged in the numeric circuit as serial data in the arrangement order.   The transmission apparatus according to claim 3, wherein the first-in first-out circuit is configured to output a dummy signal when the signal to be output is not held. A bit number conversion circuit that receives a signal of a plurality of bits from the first-in first-out circuit, converts the signal into a signal having a bit number different from the received bit number, and outputs the signal to the register circuit;
The transmission apparatus according to claim 3 or 4, wherein the first-in first-out circuit is configured to output a signal of a plurality of bits to the number setting circuit via the bit number conversion circuit. In a receiving device including an output interface of a plurality of standards and a receiving interface for receiving data from other devices,
Means for receiving serial data from the receiving interface;
Means for outputting the received serial data from an output interface of a plurality of standards in the order in which they are arranged. In a receiving device comprising a plurality of standard input / output interfaces and a receiving interface for receiving data from other devices,
The reception interface is configured to output a signal forming the received serial data according to the arranged order when receiving the serial data,
A numerical circuit that holds the signals output from the reception interface according to the order in which they are arranged, and divides them into predetermined bits according to the order in which they are arranged;
A receiving apparatus comprising: a plurality of first-in first-out circuits that respectively hold signals output separately from the number circuit and output the held signals to an output interface associated in advance.   The receiving apparatus according to claim 7, wherein the first-in first-out circuit is configured to discard the dummy signal when the held signal includes a dummy signal. A transmission device according to claim 2;
A receiving device according to claim 6;
And a transmission line that transmits serial data from a transmission interface included in the transmission device to a reception interface included in the reception device. A transmission device according to any one of claims 3 to 5,
A receiving device according to claim 7 or claim 8,
A transmission line for transmitting serial data transmitted from a transmission interface included in the transmission device to a reception interface included in the reception device.   The communication system according to claim 9 or 10, wherein the transmission device and the reception device are in-vehicle devices.

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