Transmitter, receiver and transceiver system

Abstract

To provide a transmitting / receiving system that transmits non-video data in addition to video data through a common transmission path.SOLUTION: A transmitting / receiving system includes a transmitting device 10 and a receiving device. The transmitting device 10 includes a combining unit 40 and a transmitting unit 50. The combining unit 40 inputs a DE signal, video data (active data, blank data), and non-video data, combines the video data and non-video data according to predetermined rules, and outputs combined data. The transmitting unit 50 inputs the combined data output from the combining unit 40, inserts BS data and BE data into this combined data, and sends the inserted combined data to a transmission path 30.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a transmission device, a reception device, and a transmission / reception system.

Background Art

[0002] The invention of a transmission / reception system for transmitting video data for displaying video on a video display device such as a liquid crystal display device is disclosed in Patent Document 1. The transmission / reception system described in this document includes a transmission device that sends out video data including active data and blank data, and a reception device that receives the video data sent out from this transmission device and displays video on the video display device.

[0003] In this transmission / reception system, the transmission device inputs active data and blank data to be sent to the reception device, and also inputs a DE signal (data enable signal). Then, the transmission device sends out active data to the reception device during a period (active period) when the DE signal is at the first level (for example, H level). The transmission device sends out blank data to the reception device during a period (blank period) when the DE signal is at the second level (for example, L level).

[0004] Also, the transmission device sends out BS data (blank start data) representing the timing (start timing of the blank period) when the DE signal transitions from the first level to the second level to the reception device. Furthermore, the transmission device sends out BE data (blank end data) representing the timing (end timing of the blank period) when the DE signal transitions from the second level to the first level to the reception device.

[0005] The reception device receives the data sent out from the transmission device and reaching through the transmission path. Then, the reception device detects BS data and BE data from the received data, and regenerates the DE signal based on the timing when these are detected. Also, the reception device separates active data and blank data from the received data based on this regenerated DE signal.

Prior Art Documents

[0006] [Patent Document 1] International Publication No. 2009 / 069430 [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] In the transmission and reception system described above, there is a need to transmit not only video data (active data, blank data) but also non-video data from the transmitting device to the receiving device. Here, non-video data differs from video data and includes, for example, I2C data for equipment control, I2S data for audio, and general-purpose input / output data. If non-video data can be transmitted in addition to video data via a common transmission path, it is advantageous because it can suppress the increase in system costs.

[0008] When transmitting video data and non-video data from a transmitting device to a receiving device, it is necessary to transmit the video data in such a way that the receiving device can display the video without any problems. In addition, to prevent delays in the operation of equipment using non-video data on the receiving device side, the transmission of non-video data is required to have low latency and low latency variation.

[0009] The present invention aims to provide a transmitting device, a receiving device, and a transmitting / receiving system that can transmit non-video data in addition to video data over a common transmission path and that can meet the above-mentioned requirements. [Means for solving the problem]

[0010] The present invention provides a transmitting device for transmitting video data and non-video data, including active data and blank data, wherein the ratio of the amount of data between the transmitted video data and non-video data is N or greater (where N is a positive integer), and comprises a coupling unit for combining the video data and non-video data, and a transmitting unit for transmitting the data combined by the coupling unit.

[0011] The coupling unit receives DE signals representing an active period for sending active data and a blank period for sending blank data, video data, and non-video data as inputs. It includes a first counter whose count value is initialized and counts reference clock pulses when the DE signal indicates a transition from the blank period to the active period and when the count value reaches N, and a second counter whose count value is initialized and counts reference clock pulses when the count value reaches N. During the active period, non-video data is inserted into the active data in the reference clock cycle when the count value of the first counter is a first predetermined value, and during the blank period, non-video data is inserted into the blank data in the reference clock cycle when the count value of the second counter is a second predetermined value, and the video data and non-video data are combined to output combined data.

[0012] The transmitting unit receives the combined data output from the coupling unit, inserts the BS data into the combined data in the reference clock cycle immediately following the timing when the DE signal indicates a transition from the active period to the blank period, and inserts the BE data into the combined data in the reference clock cycle immediately following the timing when the DE signal indicates a transition from the blank period to the active period, and then transmits the combined data after the BS data and BE data have been inserted.

[0013] The coupling section preferably inserts the count value of the second counter from the cycle in which the BS data was inserted in the cycle following the cycle in which the BS data was inserted. Alternatively, the coupling section preferably inserts non-video data in the cycle two cycles after the cycle in which the BS data was inserted.

[0014] The present invention provides a receiving device for receiving video data including active data and blank data, as well as non-video data, transmitted from a transmitting device based on a DE signal, wherein the ratio of the amount of data between the received video data and the non-video data is N or greater (where N is a positive integer), and comprises a receiving unit for receiving data transmitted from a transmitting device, and a separation unit for separating video data and non-video data based on the data received by the receiving unit.

[0015] The receiving unit receives data transmitted from the transmitting device, detects the BS data and BE data contained in the received data, and reconstructs the DE signal representing the active period and blank period based on the BS data and BE data.

[0016] The separation unit receives data and a DE signal from the receiving unit and includes a first counter whose count value is initialized and counts pulses of the reference clock when the DE signal indicates a transition from a blank period to an active period and when the count value reaches N, and a second counter whose count value is initialized and counts pulses of the reference clock when the count value reaches N. During the active period, data from the data received by the receiving unit in the reference clock cycle where the count value of the first counter is a first predetermined value is treated as non-video data, and data from other cycles is treated as active data. During the blank period, data from the data received by the receiving unit in the reference clock cycle where the count value of the second counter is a second predetermined value is treated as non-video data, and data from other cycles is treated as blank data, thereby separating video data from non-video data.

[0017] The separation unit preferably uses the data from the cycle following the cycle in which BS data was detected as the count value of the second counter in the cycle in which BS data was detected, and performs the counting operation of the second counter. Alternatively, the separation unit preferably uses the data from the cycle two cycles after the cycle in which BS data was detected as non-video data.

[0018] The transmission / reception system of the present invention includes the above-described transmission device of the present invention and the above-described reception device of the present invention.

Advantages of the Invention

[0019] According to the present invention, in addition to video data, non-video data can be transmitted through a common transmission path. Also, on the receiving device side, video can be displayed without problems, and on the receiving device side, the delay in the operation of devices using non-video data can be suppressed.

Brief Description of the Drawings

[0020] [Figure 1] FIG. 1 is a diagram showing the configuration of the transmission / reception system 1. [Figure 2] FIG. 2 is a diagram showing the configuration of the transmission device 10. [Figure 3] FIG. 3 is a diagram showing the configuration of the reception device 20. [Figure 4] FIG. 4 is a timing chart for explaining an example of a mode of inserting non-video data into video data. [Figure 5] FIG. 5 is a timing chart for explaining a mode of inserting non-video data into video data in the transmission / reception system 1. [Figure 6] FIG. 6 is a timing chart for explaining a mode of inserting non-video data into video data in the transmission / reception system 1. [Figure 7] FIG. 7 is a timing chart for explaining a mode of inserting non-video data into video data in the transmission / reception system 1.

Modes for Carrying Out the Invention

[0021] Hereinafter, modes for carrying out the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same reference numerals are given to the same elements, and duplicate explanations are omitted. The present invention is not limited to these examples, but is indicated by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

[0022] In developing a transmission and reception system that transmits non-video data in addition to video data (active data, blank data) from a transmitting device to a receiving device via a common transmission path, the inventors considered improving the transmission and reception system described in Patent Document 1. In the process of this consideration, the inventors noticed that the amount of non-video data Y is less than the amount of video data X to be transmitted.

[0023] The inventors considered setting the length of the unit period for transmitting video data to N cycles of the reference clock and the unit period for transmitting non-video data to 1 cycle of the reference clock, assuming that the ratio of data amounts (X / Y) is a positive integer N or greater, and alternating these two unit periods, thereby making the period of the reference clock N / (N+1) times that of the case where non-video data is not transmitted. Such a transmission and reception system is expected to be able to transmit non-video data in addition to video data via a common transmission path, allowing the receiving device to display video without problems, and suppressing delays in the operation of equipment using non-video data on the receiving device side.

[0024] Incidentally, as mentioned above, in the transmission and reception system described in Patent Document 1, the transmitting device sends BS data or BE data to the receiving device at the timing of the level transition of the DE signal (the transition between the active period and the blank period). The receiving device detects the BS data and BE data from the received data and reconstructs the DE signal based on the timing of their detection. Then, based on this reconstructed DE signal, the receiving device separates the active data from the blank data from the received data.

[0025] Since the screen displaying the image is generally rectangular and the amount of active data for each line of the image is constant, the length of the period during which the DE signal is at a high level (active period) is constant. Therefore, if the length of the period during which the regenerated DE signal is at a high level differs from a predetermined constant time, the receiving device can determine that the received data is missing due to external factors such as static electricity, and furthermore, EMC resistance can be improved by taking measures such as data correction.

[0026] However, the inventors have found that when a unit period of N cycles for transmitting video data and a unit period of 1 cycle for transmitting non-video data are alternated, the following problems may arise. Specifically, if priority is given to sending BS data or BE data from the transmitting device to the receiving device at the timing of the DE signal level transition, the length of the period during which the DE signal is at a high level (active period) may vary depending on the timing of the insertion of non-video data. If the length of the period during which the DE signal is at a high level varies regardless of external factors such as static electricity, the receiving device cannot determine whether the received data is missing due to external factors such as static electricity. Such a transmission and reception system is not suitable for application in fields where higher EMC immunity is required.

[0027] The transmission / reception system 1 described below can resolve the problems mentioned above. Figure 1 shows the configuration of the transmission / reception system 1. The transmission / reception system 1 comprises a transmitting device 10 and a receiving device 20. The transmitting device 10 sends video data (active data, blank data) and non-video data to the transmission path 30. The receiving device 20 receives the data output from the transmitting device 10 and arriving via the transmission path 30, and separates this received data into video data and non-video data. The receiving device 20 then outputs the video data to a video display device such as a liquid crystal display device, and outputs the non-video data to a device that uses non-video data.

[0028] Figure 2 shows the configuration of the transmitting device 10. The transmitting device 10 comprises a coupling unit 40 and a transmitting unit 50. The coupling unit 40 receives DE signals, video data (active data, blank data), and non-video data, combines the video data and non-video data, and outputs combined data. The transmitting unit 50 receives the combined data output from the coupling unit 40, inserts BS data and BE data into this combined data, and sends the combined data after insertion to the transmission line 30.

[0029] The coupling unit 40 includes a first counter 41, a second counter 42, a selector 43, a logic circuit 44, a multiplexer 45, a first buffer 46, and a second buffer 47.

[0030] The first counter 41 and the second counter 42 each count pulses of the reference clock, and their count values ​​are initialized when they reach N. That is, the count values ​​of the first counter 41 and the second counter 42 are in the range of 0 to N-1. The first counter 41 is also initialized when the DE signal transitions from the blank period to the active period. The second counter 42 outputs the count value M in the cycle immediately following the transition of the DE signal from the high level to the low level to the multiplexer 45.

[0031] Selector 43 receives the count values ​​of the first counter 41 and the second counter 42, as well as the DE signal. During the active period when the DE signal is at a high level, selector 43 selects and outputs the count value of the first counter 41, and during the blank period when the DE signal is at a low level, selects and outputs the count value of the second counter 42.

[0032] The logic circuit 44 receives the count value and DE signal selected and output by the selector 43. During the active period when the DE signal is at a high level, the logic circuit 44 outputs a signal to the multiplexer 45 indicating that the value output from the selector 43 (the count value of the first counter 41) is a first predetermined value N1. During the blank period when the DE signal is at a low level, the logic circuit 44 outputs a signal to the multiplexer 45 indicating that the value output from the selector 43 (the count value of the second counter 42) is a second predetermined value N2. N1 and N2 may be any integer values ​​in the range from 0 to N-1, and may be equal to each other or different to each other. The signal output from the logic circuit 44 to the multiplexer 45 indicates the cycle of the reference clock that inserts non-video data into the video data. The logic circuit 44 also outputs the DE signal after inserting non-video data into the video data to the transmitter 50.

[0033] The first buffer 46 receives video data and stores it temporarily. The second buffer 47 receives non-video data and stores it temporarily. The first buffer 46 and the second buffer 47 may each be FIFO memory.

[0034] The multiplexer 45 reads video data stored in the first buffer 46 and inputs it, and reads non-video data stored in the second buffer 47 and inputs it. The multiplexer 45 also receives a signal output from the logic circuit 44 (a signal indicating the cycle of the reference clock for inserting non-video data into the video data), and the count value M of the second counter 42 in the cycle immediately following the timing when the DE signal transitions from high level to low level. Based on the signal output from the logic circuit 44, the multiplexer 45 inserts non-video data into the video data. The multiplexer 45 also inserts the count value M in the cycle two cycles after the timing when the DE signal transitions from high level to low level. The multiplexer 45 outputs combined data, which is a combination of these, to the transmission unit 50.

[0035] The transmitting unit 50 includes a packer 51, a scrambler 52, an encoder 53, and a serializer 54. The packer 51 receives the combined data (video data + non-video data) output from the multiplexer 45 of the coupling unit 40, packets this combined data, and outputs the packetized data to the scrambler 52. The scrambler 52 has a random number generator and uses the random numbers generated by this generator to scramble the data output from the packer 51 and output it. The encoder 53 performs encoding processing using a symbol mapping method (for example, 8B10B encoding processing) and encodes the data output from the scrambler 52 and outputs it. The serializer 54 receives the data output from the encoder 53, converts this data (parallel data) into serial data, and sends it to the transmission line 30.

[0036] Furthermore, the transmitting unit 50 also receives the DE signal output from the logic circuit 44 of the coupling unit 40. BS data (blank start data) is inserted into the coupled data in the reference clock cycle immediately following the timing when the DE signal indicates a transition from the active period to the blank period, and BE data (blank end data) is inserted into the coupled data in the reference clock cycle immediately following the timing when the DE signal indicates a transition from the blank period to the active period. The transmitting unit 50 then performs the above processing on the coupled data after the insertion of the BS and BE data, using the packer 51, scrambler 52, encoder 53, and serializer 54, respectively. At this time, the encoder 53 uses K code in 8B10B encoding for the BS and BE data, and D code in 8B10B encoding for the other data.

[0037] Both D-code and K-code encode 8-bit data into 10-bit data. That is, in both D-code and K-code, 8 bits of information are associated with 10-bit symbols. Generally, 8-bit data is 256 (=2 8 ) can represent different values, and 10-bit data can represent 1024 (=2 10It can represent 1024 different values. D-code encodes all 8-bit data into 10-bit data, while K-code encodes 12 8-bit data into 10-bit data. Therefore, 10-bit data that can represent 1024 different values ​​can include 10-bit data encoded with D-code and 10-bit data encoded with K-code.

[0038] For example, if we represent 8-bit data and 10-bit data in binary, the 8-bit data [0001_1100] corresponds to the K-code 10-bit data [00_1111_0100] and [11_0000_1011], while the D-code 10-bit data corresponds to [00_1110_1011] and [00_1110_0100]. Thus, even if the 8-bit data has the same value, the K-code 10-bit data is different from the D-code 10-bit data. Since the K-code 10-bit data will never match the D-code 10-bit data, it is possible to identify whether any given 10-bit data is a K-code or a D-code.

[0039] Figure 3 shows the configuration of the receiving device 20. The receiving device 20 comprises a receiving unit 60 and a separation unit 70. The receiving unit 60 receives data that has been sent from the transmitting unit 50 of the transmitting device 10 and arrived via the transmission line 30. The separation unit 70 separates video data and non-video data based on the data received by the receiving unit 60.

[0040] The receiving unit 60 includes a deserializer 61, a decoder 62, a descrambler 63, and an unpacker 64. The deserializer 61 converts the data (serial data) sent from the transmitting device 10 into parallel data and outputs it. The decoder 62 decodes the data output from the deserializer 61 and outputs it. The descrambler 63 descrambles the data output from the decoder 62 and outputs it. The unpacker 64 unpacks the data output from the decoder 62 and outputs it.

[0041] Furthermore, the receiving unit 60 detects BS data and BE data contained in the received data during the processing of the deserializer 61, decoder 62, descrambler 63, and unpacker 64, and reconstructs DE signals representing the active period and blank period based on this BS data and BE data.

[0042] The configurations of the transmitting unit 50 and the receiving unit 60 are the same as those of the invention disclosed in Patent Document 1.

[0043] The separation unit 70 includes a first counter 71, a second counter 72, a selector 73, a logic circuit 74, and a demultiplexer 75.

[0044] The first counter 71 and the second counter 72 each count pulses of the reference clock, and their count values ​​are initialized when the count value reaches N. That is, the count values ​​of the first counter 71 and the second counter 72 are in the range of 0 to N-1. In addition, the first counter 71's count value is also initialized when the DE signal indicates a transition from the blank period to the active period.

[0045] Selector 73 receives the count values ​​of the first counter 71 and the second counter 72, as well as the DE signal. During the active period when the DE signal is at a high level, selector 73 selects and outputs the count value of the first counter 71, and during the blank period when the DE signal is at a low level, selects and outputs the count value of the second counter 72.

[0046] Logic circuit 74 receives the count value and DE signal selected and output by selector 73. During the active period when the DE signal is at a high level, logic circuit 74 outputs a signal to the demultiplexer 75 indicating that the value output from selector 73 (the count value of the first counter 71) is a first predetermined value N1. During the blank period when the DE signal is at a low level, logic circuit 74 outputs a signal to the demultiplexer 75 indicating that the value output from selector 73 (the count value of the second counter 72) is a second predetermined value N2. N1 and N2 in logic circuit 74 are the same values ​​as N1 and N2 in logic circuit 44, respectively. The signal output from logic circuit 74 to the demultiplexer 75 indicates the cycle of the reference clock in which non-video data is inserted into the video data.

[0047] The demultiplexer 75 receives combined data (video data + non-video data) output from the receiver 60, as well as a signal output from the logic circuit 74. Based on the signal output from the logic circuit 74, the demultiplexer 75 separates the combined data into video data and non-video data.

[0048] In other words, during the active period when the DE signal is at a high level, the demultiplexer 75 treats the data from the reference clock cycle where the count value of the first counter 71 is a first predetermined value N1 as non-video data, and the data from other cycles as active data. Also, during the blank period when the DE signal is at a low level, the demultiplexer 75 treats the data from the reference clock cycle where the count value of the second counter 72 is a second predetermined value N2 as non-video data, and the data from other cycles as blank data.

[0049] Furthermore, the demultiplexer 75 uses the data from the cycle following the cycle in which BS data was detected, from the data received by the receiver 60, as the count value of the second counter 72 in the cycle in which BS data was detected, and causes the second counter 72 to perform its counting operation. As a result, the second counter 42 of the transmitter 10 and the second counter 72 of the receiver 20 can output the same count value.

[0050] Figure 4 is a timing chart illustrating an example of inserting non-video data into video data. This figure shows a case where a unit period of N cycles for transmitting video data and a unit period of 1 cycle for transmitting non-video data are simply alternated. Here, N=3. When N=3, there are three ways to insert non-video data into video data. From top to bottom, this figure shows the reference clock, DE signal, video data (active data A, blank data B), the non-video data insertion position for each of the non-video data insertion methods (1) to (3), and non-video data C.

[0051] In each of the non-video data insertion methods (1) to (3), if non-video data is simply inserted at the position indicated by the upward arrow, the length of the period during which the DE signal is at a high level (active period) may vary depending on the non-video data insertion method. If the length of the period during which the DE signal is at a high level varies independently of external factors such as static electricity, the receiving device cannot determine whether the received data is lost due to external factors such as static electricity. Such a transmission and reception system is not suitable for application in fields requiring higher EMC immunity.

[0052] In the transmission and reception system 1 of this embodiment, the basic principle is to alternate between a unit period of N cycles for transmitting video data and a unit period of 1 cycle for transmitting non-video data, while also ensuring that the non-video data insertion patterns differ between the active period and the blank period, thereby resolving the aforementioned problems.

[0053] Figures 5 to 7 are timing charts illustrating the method of inserting non-video data into video data in the transmission / reception system 1. Here, N=3 is used. Furthermore, both the first predetermined value N1 of the first counter 41, which indicates the insertion position of the non-video data, and the second predetermined value N2 of the second counter 42 are set to 0. These figures show, from top to bottom, the DE signal, combined data (video data + non-video data), the count value of the second counter 42, and the count value of the first counter 41. The method shown in Figure 5 is a modification of the non-video data insertion method (1) shown in Figure 4. The method shown in Figure 6 is a modification of the non-video data insertion method (2) shown in Figure 4. The method shown in Figure 7 is a modification of the non-video data insertion method (3) shown in Figure 4.

[0054] In all of the non-video data insertion configurations shown in Figures 5 to 7, during the active period when the DE signal is at the H level, non-video data C is inserted into the active data A in the cycle when the count value of the first counter 41 is 0. During the blank period when the DE signal is at the L level, the insertion of BS data in the first cycle and BE data in the last cycle is given top priority, and the non-video data C is inserted into the blank data B in the cycle when the count value of the second counter 42 is 0. In addition to this basic procedure, the count value M is inserted in the cycle following the BS data insertion cycle. Furthermore, non-video data C is inserted in the cycle following the insertion cycle of the count value M. The count value M is the count value of the second counter 42 in the cycle immediately following the timing when the DE signal transitions from the H level to the L level (i.e., the BS data insertion cycle).

[0055] The first counter 41 of the transmitting device 10 and the first counter 71 of the receiving device 20 are both initialized at the timing when the DE signal indicates a transition from the blank period to the active period, so they can output the same count value. The second counter 72 of the receiving device 20 takes the data from the cycle following the cycle in which BS data was detected from the data received by the receiving unit 60 as the count value of the second counter 72 in the cycle in which BS data was detected, so it can output the same count value as the second counter 42 of the transmitting device 10. The values ​​N, N1, and N2 are shared between the transmitting device 10 and the receiving device 20, and the non-video data insertion rules are shared.

[0056] In this way, the receiving device 20, upon receiving data transmitted from the transmitting device 10, can detect BS data and BE data, regenerate the DE signal, and separate video data from non-video data. Furthermore, since the system is based on alternating N-cycle units for transmitting video data and 1-cycle units for transmitting non-video data, the receiving device 20 can display video without problems, and the operation delay of equipment using non-video data on the receiving device 20 can be suppressed. In addition, since the length of the period during which the DE signal is at a high level can be set to a predetermined fixed time, if the length of that period differs from the predetermined fixed time, it can be determined that the received data is missing due to external factors such as static electricity, and further measures such as data correction can be taken to improve EMC resistance. [Explanation of Symbols]

[0057] 1...Transmitting / receiving system, 10...Transmitting device, 20...Receiving device, 30...Transmission line, 40...Coupling unit, 41...First counter, 42...Second counter, 43...Selector, 44...Logic circuit, 45...Multiplexer, 46...First buffer, 47...Second buffer, 50...Transmitting unit, 51...Packer, 52...Scrambler, 53...Encoder, 54...Serializer, 60...Receiving unit, 61...Deserializer, 62...Decoder, 63...Descrambler, 64...Unpacker, 70...Separation unit, 71...First counter, 72...Second counter, 73...Selector, 74...Logic circuit, 75...Demultiplexer.

Claims

1. A transmitting device that transmits video data including active data and blank data, as well as non-video data, The ratio of the amount of data between the video data to be transmitted and the non-video data is N or greater (where N is a positive integer), The system comprises a coupling unit that combines the video data and the non-video data, and a transmission unit that transmits the data combined by the coupling unit. The aforementioned joint is The DE signal representing the active period for transmitting the active data and the blank period for transmitting the blank data, the video data, and the non-video data are input. The system includes a first counter whose count value is initialized and counts pulses of a reference clock when the DE signal indicates a transition from a blank period to an active period and when the count value reaches N, and a second counter whose count value is initialized and counts pulses of the reference clock when the count value reaches N. During the active period, the non-video data is inserted into the active data in the cycle of the reference clock where the count value of the first counter is a first predetermined value. During the blank period, the non-video data is inserted into the blank data in the cycle of the reference clock where the count value of the second counter is a second predetermined value. The video data and the non-video data are combined to output combined data. The aforementioned transmitting unit The coupling data output from the coupling unit is input, The BS data is inserted into the combined data in the cycle of the reference clock immediately following the timing when the DE signal indicates a transition from the active period to the blank period. The BE data is inserted into the combined data in the cycle of the reference clock immediately before the timing in which the DE signal indicates a transition from the blank period to the active period. The combined data is sent after the BS data and BE data have been inserted. Transmitter.

2. The coupling unit inserts the count value of the second counter in the cycle in which the BS data was inserted, in the cycle following the cycle in which the BS data was inserted. The transmitting device according to claim 1.

3. The coupling unit inserts the non-video data in a cycle two cycles after the cycle in which the BS data is inserted. The transmitting device according to claim 2.

4. A receiving device that receives video data including active data and blank data, as well as non-video data, transmitted from a transmitting device based on a DE signal, The ratio of the amount of data between the received video data and the non-video data is N or greater (where N is a positive integer), The system comprises a receiving unit that receives data transmitted from the transmitting device, and a separation unit that separates the video data from the non-video data based on the data received by the receiving unit, The receiving unit is The system receives data transmitted from the transmitting device, detects BS data and BE data contained in the received data, and reconstructs DE signals representing the active period and blank period based on the BS data and BE data. The aforementioned separation unit is The data received by the receiving unit and the DE signal are input. The system includes a first counter whose count value is initialized and counts pulses of a reference clock when the DE signal indicates a transition from a blank period to an active period and when the count value reaches N, and a second counter whose count value is initialized and counts pulses of the reference clock when the count value reaches N. During the active period, among the data received by the receiving unit, the data from the cycle of the reference clock in which the count value of the first counter is a first predetermined value is designated as the non-video data, and the data from other cycles is designated as the active data. During the blank period, among the data received by the receiving unit, the data from the cycle of the reference clock in which the count value of the second counter is a second predetermined value is designated as the non-video data, and the data from other cycles is designated as the blank data. The video data and the non-video data are separated. Receiving device.

5. The separation unit causes the second counter to perform its counting operation using the data from the cycle following the cycle in which the BS data was detected as the count value of the second counter in the cycle in which the BS data was detected. The receiving device according to claim 4.

6. The separation unit uses the data from the cycle two cycles after the cycle in which the BS data was detected as the non-video data. The receiving device according to claim 5.

7. A transmitting and receiving system comprising a transmitting device according to claim 1 and a receiving device according to claim 4.

8. A transmitting and receiving system comprising a transmitting device according to claim 2 and a receiving device according to claim 5.

9. A transmitting and receiving system comprising a transmitting device according to claim 3 and a receiving device according to claim 6.

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