WO2013031476A1

WO2013031476A1 - Transmission device, reception device and transmission/reception system

Info

Publication number: WO2013031476A1
Application number: PCT/JP2012/069734
Authority: WO
Inventors: 蜂谷　尚悟; 礼藤木
Original assignee: ザインエレクトロニクス株式会社
Priority date: 2011-08-26
Filing date: 2012-08-02
Publication date: 2013-03-07
Also published as: JP2013046364A

Abstract

A transmission/reception system (1A) comprises a transmission device (10A) and reception device (20A). The transmission device (10A) comprises an encoding unit (11), serializer (12) and transmission unit (13). The reception device (20A) comprises a decoding unit (21), deserializer (22), reception unit (23), error detection unit (24) and reset instruction unit (25). The encoding unit (11) causes a synchronization signal (encoding/decoding synchronization signal) for synchronizing encoding processing of the encoding unit (11) and decoding processing of the decoding unit (21) to be periodically transmitted as encoded data from the transmission unit (13) to the reception device (20A). Even when a reset instruction signal is received from the reset instruction unit (25) of the reception device (20A), the encoding unit (11) causes the encoding/decoding synchronization signal to be transmitted as encoded data from the transmission unit (13) to the reception device (20A).

Description

Transmission device, reception device, and transmission / reception system

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

In recent years, the number of digital image devices that handle digital images has increased. Examples of digital image devices include digital video devices such as a digital still camera that captures still images, a digital video camera that captures moving images, and a digital television receiver that displays digital images. These digital video apparatuses have a display that electrically displays a digital image.

Further, not only an electrically displaying device but also an image generating device having a printer function for generating a digital image on a medium such as paper is known. Examples of the generation method include an inkjet method and a laser method. In recent years, in addition to a printer function, an image generation apparatus called a “multifunction printer” having a plurality of functions such as a recording function, a FAX function, and a scanner function has become widespread. Such a digital image device has a transmission / reception system that performs image transmission inside and outside the device (Patent Document 1).

As a transmission / reception system that performs image transmission, a method is known in which encoded data is transmitted from a transmission device to a reception device, and the reception device decodes the encoded data. More specifically, in the transmission / reception system, the transmission apparatus encodes data to be transmitted with a random number and transmits the encoded data. The receiving device that has received the encoded data transmitted from the transmitting device generates the original data by decoding the received encoded data with the same random number used during encoding. Note that “encoding” includes encrypting the data to conceal the transmitted / received data, and includes scrambling the data to suppress EMI noise due to the transmitted / received data. .

In order to correctly obtain the original data from the encoded data generated by the encoding process of the transmitting apparatus by the decoding process of the receiving apparatus, synchronization of random numbers between the encoding process of the transmitting apparatus and the decoding process of the receiving apparatus Must be established (Patent Document 2).

JP 2007-013552 A JP-A-9-107346

If the encoded data in the transmission / reception system becomes a fake data string due to noise superimposition or the like, the random number is out of synchronization and is not decoded into the original data. For such out-of-synchronization, a method has been proposed in which fixed data called a comma pattern is inserted into encoded data in a no-data section such as blanking time and random numbers are resynchronized ( For example, “DisplayPort” or the like performs this periodically). Therefore, even if a part of the encoded data is damaged due to transient noise superposition or the like, not all data is lost, and at the time of decoding the next encoded data, the synchronization of random numbers is reestablished, The original data is played back.

However, with the above-described method, once a loss of synchronization occurs, all data until resynchronization is performed by the next comma pattern is lost. Such a lack of data degrades the image quality in the digital image device. For example, in a digital video apparatus such as a digital video camera that handles moving images, “flickering” occurs in the moving image, and in an image generation apparatus such as a “multifunction printer”, an image is generated by a printer function or a scanner function. Degrading the quality of still image capture. In recent years, digital image apparatuses have become more sophisticated and multifunctional as seen in “multifunction printers” and the like, and EMI noise has become more severe, and some measures are required. For such a problem, frequent insertion of a comma pattern is conceivable, but frequent insertion of a fixed pattern is not preferable because it causes an increase in EMI noise. In addition, if the method of re-establishing synchronization is applied only when the out-of-synchronization proposed in Cited Document 2 is applied, the system will surely wait until an error occurs, and in image transmission where quality is important It is not preferable.

The present invention has been made to solve the above-described problems, and a transmission device, a reception device, and a transmission device that can suppress reception errors by ensuring synchronization between the encoding process and the decoding process. An object is to provide a transmission / reception system.

The transmission / reception system of the present invention includes the following transmission device and reception device, and transmits encoded data from the transmission device to the reception device, and the transmission device transmits a synchronization signal as encoded data when a reception error occurs. It is characterized by.

The transmitting device of the present invention is (1) an encoding unit that generates encoded data by encoding data to be transmitted to the receiving device, and (2) a transmitting unit that transmits the encoded data to the receiving device, It is characterized by providing. Further, the encoding unit periodically transmits a synchronization signal for establishing synchronization between the encoding process of the encoding unit and the decoding process of the receiving device as encoded data from the transmitting unit to the receiving device. When a reception error occurs in the receiving apparatus, a synchronization signal is transmitted as encoded data from the transmitting unit to the receiving apparatus in order to reestablish synchronization between the encoding process and the decoding process.

The receiving device of the present invention includes (1) a receiving unit that receives encoded data transmitted from a transmitting device, and (2) a decoding that decodes the encoded data received by the receiving unit and outputs the original data And a section. Further, when the decoding unit receives a synchronization signal for establishing synchronization between the encoding process of the transmitting device and the decoding process of the decoding unit as encoded data, the decoding unit To establish synchronization between the encoding process and the decoding process, and to reestablish synchronization between the encoding process and the decoding process due to a reception error occurring in the data output from the decoding unit When the receiver receives the synchronization signal as encoded data from the transmission device, the synchronization between the encoding process and the decoding process is initialized once to reestablish the synchronization, and the subsequent decoding process is performed. It is characterized by that.

The transmission apparatus of the present invention, when receiving a reception error detection signal indicating that a reception error has occurred in the reception apparatus, a reset instruction signal for reestablishing synchronization between the encoding process and the decoding process And a reset instruction unit that transmits the reset instruction signal to the encoding unit. When the encoding unit receives the reset instruction signal, the encoding unit transmits a synchronization signal as encoded data from the transmission unit to the receiving device. Also good. In addition, the receiving device of the present invention detects that a receiving error has occurred in the receiving device, generates a receiving error detection signal, receives the receiving error detection signal, and a receiving error detecting signal. And a reset instruction unit that generates a reset instruction signal for transmitting the synchronization signal as encoded data from the transmission unit to the reception device, and transmits the reset instruction signal to the encoding unit.

According to the present invention, the synchronization between the encoding process and the decoding process can be made more reliable, and reception errors can be suppressed.

FIG. 1 is a diagram illustrating a configuration of a transmission / reception system 1A according to the first embodiment. FIG. 2 is a diagram illustrating a waveform example of each signal in the transmission / reception system 1A of the first embodiment. FIG. 3 is a diagram illustrating a configuration of a modified example of the transmission / reception system 1A of the first embodiment. FIG. 4 is a diagram illustrating a configuration of a modified example of the transmission / reception system 1A of the first embodiment. FIG. 5 is a diagram illustrating a configuration of a transmission / reception system 1B according to the second embodiment. FIG. 6 is a diagram illustrating a waveform example of each signal in the transmission / reception system 1B of the second embodiment.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments 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 or equivalent elements are denoted by the same reference numerals, and redundant description is omitted.
(First embodiment)

FIG. 1 is a diagram illustrating a configuration of a transmission / reception system 1A according to the first embodiment. The transmission / reception system 1A includes a transmission device 10A and a reception device 20A. The transmitting apparatus 10A and the receiving apparatus 20A transmit and receive data via the signal transmission paths 31 to 33.

The transmission apparatus 10A includes an encoding unit 11, a serializer 12, and a transmission unit 13. The encoding unit 11 inputs data to be transmitted to the receiving device 20A from the outside in a parallel data format, encodes the data, and outputs the encoded data. The serializer 12 converts the encoded data (parallel data) output from the encoding unit 11 into serial data, and provides the serial data to the transmission unit 13. The transmission unit 13 sends the encoded data (serial data) input from the serializer 12 to the

signal transmission paths

31 and 32 as differential data.

The

signal transmission paths

31, 32 transmit the differential data sent from the differential output end of the transmission unit 13 of the transmission device 10A to the differential input end of the reception unit 23 of the reception device 20A. The transmission unit 13 of the transmission device 10A and the

signal transmission paths

31 and 32 are AC coupled. Further, AC coupling is also performed between the receiving unit 23 of the receiving device 20 </ b> A and the

signal transmission paths

31 and 32.

The receiving device 20A includes a decoding unit 21, a deserializer 22, a receiving unit 23, an error detecting unit 24, and a reset instruction unit 25. The receiving unit 23 receives the encoded data (differential serial data) transmitted from the transmitting unit 13 of the transmitting apparatus 10A and reached via the

signal transmission paths

31 and 32, and outputs the encoded data as single-ended data. . The deserializer 22 converts the encoded data (serial data) output from the receiving unit 23 into parallel data, and outputs the parallel data to the decoding unit 21. The decoding unit 21 decodes the encoded data output from the deserializer 22 and outputs the original data.

Note that the signal transmission path from the transmitting apparatus 10A to the receiving apparatus 20A may have a plurality of channels. In FIG. 1 (and FIGS. 3 to 5 described later), a signal transmission path for one channel is shown for the sake of simplicity. When there are a plurality of signal transmission paths from the transmission device 10A to the reception device 20A, different data can be transmitted depending on the channel. For example, if the data to be transmitted is RGB color image data, the R image is transmitted through the first channel. Data can be transmitted, G image data can be transmitted through the second channel, and B image data can be transmitted through the third channel. Also, for example, an encoding / decoding synchronization signal described later can be transmitted through a certain channel, and another control signal (for example, DE (DataＤＥEnable) signal) can be transmitted through another channel.

The error detection unit 24 detects whether or not a reception error has occurred based on the data output from the decoding unit 21. When detecting the occurrence of a reception error, the error detection unit 24 sends a reception error detection signal indicating that fact. The reset instruction unit 25 receives the reception error detection signal and sends the reset instruction signal to the signal transmission path 33. The signal transmission path 33 transmits the reset instruction signal sent from the reset instruction unit 25 of the reception device 20A to the encoding unit 11 of the transmission device 10A.

The detection of the occurrence of a reception error by the error detection unit 24 is performed as follows, for example. The transmission device 10A transmits the valid data to which redundant bits (fixed value or checksum) are added as encoded data to the reception device 20A, and the error detection unit 24 has an error in the contents of the redundant bits in the received data. If there is an error, it is detected that a reception error has occurred. Alternatively, the transmission device 10A transmits predetermined fixed data as encoded data to the reception device 20A, and the error detection unit 24 determines whether there is an error in the content of the received fixed data, and there is an error. Detects that a reception error has occurred. Alternatively, the transmission apparatus 10A transmits the encoded data subjected to the 8b10b encoding process to the reception apparatus 20A, and the error detection unit 24 determines whether or not the content of the received data has an error that violates the 8b10b encoding protocol. If there is an error, the fact that a reception error has occurred is detected. The decoding unit 21 outputs a prepared value in place of the signal causing the error until the synchronization is re-established when the error detection unit 24 detects the occurrence of the reception error. (For example, in the case of image transmission, a pixel in which an error has occurred may be output as a value that becomes white or black).

The encoding unit 11 of the transmission apparatus 10A has a synchronization signal for establishing synchronization between the encoding process of the encoding unit 11 and the decoding process of the decoding unit 21 (hereinafter, referred to as “encoded decoding synchronization signal”). Are periodically transmitted from the transmission unit 13 to the reception device 20A as encoded data. The encoding unit 11 also receives the encoded / decoded synchronization signal as encoded data when the reset instruction signal generated when a reception error occurs in the receiving apparatus 20A is received from the reset instruction unit 25 of the receiving apparatus 20A. To be transmitted from the transmitter 13 to the receiver 20A.

Note that the timing for periodically transmitting the encoded / decoded synchronization data from the transmission device 10A to the reception device 20A is, for example, a horizontal synchronization blanking period or a vertical synchronization blanking period when valid data to be transmitted / received is image data. The

When the receiving unit 23 receives the code decoding synchronization signal as the encoded data from the transmitting device 10A, the decoding unit 21 of the receiving device 20A temporarily initializes the synchronization of the decoding process with respect to the encoding process and reestablishes the synchronization. Then, the subsequent decoding process is performed.

The encoding process performed by the encoding unit 11 of the transmitting apparatus 10A may be an encryption process for data concealment or a scramble process for EMI noise suppression. When synchronization between the encoding process of the encoding unit 11 and the decoding process of the decoding unit 21 is established, the original data is converted into encoded data in the encoding process of the encoding unit 11. The internal data for encoding used at the time and the internal data for decoding used when converting the encoded data into the original data in the decoding process of the decoding unit 21 are the same as each other. In the case of encryption processing and scramble processing, the internal data for encoding and the internal data for decryption used differ between certain original data to be transmitted and received and the next original data.

For example, when the encoding unit 11 performs the scramble process as the encoding process and the decoding unit 21 performs the descrambling process as the decoding process, even when the original data to be transmitted / received continues for a plurality of bytes with a constant value Since the internal data for code changes sequentially, the encoded data obtained by the scramble process also changes sequentially. Thereby, the EMI noise suppression effect is obtained. The decoding unit 21 can obtain original data by descrambling the encoded data using the same internal decoding data as the internal encoding data used by the encoding unit 11 during the scramble process. .

The encoding unit 11 of the transmitting apparatus 10A may further perform 8b10b encoding processing on the encoded data after scramble processing. At this time, the decoding unit 21 of the receiving device 20A performs the descrambling process after performing the 8b10b decoding process.

FIG. 2 is a diagram illustrating a waveform example of each signal in the transmission / reception system 1A of the first embodiment. In the figure, (a) original data (parallel data) input to the transmission apparatus 10A, (b) encoded data (serial data) transmitted from the transmission apparatus 10A to the reception apparatus 20A, and (c) from the reception apparatus 20A. Output original data (parallel data), (d) a reception error detection signal output from the error detection unit 24 of the receiver 20A, and (e) a reset instruction signal output from the reset instruction unit 25 of the receiver 20A. Each waveform is shown.

If the encoded data sent from the transmitting device 10A to the receiving device 20A is garbled due to the transmission quality deterioration of the

signal transmission paths

31, 32 or the influence of external noise, it is obtained by the decoding process of the decoding unit 21 of the receiving device 20A. The data becomes invalid data different from the original data. The error detection unit 24 outputs a reception error detection signal when the reception error occurrence is detected. Further, the reset instruction unit 25 outputs a reset instruction signal when the reception error detection signal is input. Receiving the reset instruction signal, transmitting apparatus 10A outputs a code decoding synchronization signal. When receiving the code decoding synchronization signal from the transmitting apparatus 10A, the decoding unit 21 of the receiving apparatus 20A once initializes the synchronization between the encoding process and the decoding process, and reestablishes the synchronization. Process. When the synchronization is re-established, the data obtained by the decryption process of the decryption unit 21 is the same as the original data.

As described above, the transmission / reception system 1A according to the present embodiment transmits a code decoding synchronization signal from the transmission device 10A to the reception device 20A not only when the error detection unit 24 detects the occurrence of a reception error but also periodically. In the decoding unit 21 of the receiving device 20A, the synchronization of the decoding process is once initialized and re-established, and the subsequent decoding process is performed. Therefore, when a reception error occurs due to loss of synchronization, synchronization between the encoding process and the decoding process can be re-established without waiting for the timing of periodic transmission / reception of the encoded / decoded synchronization signal. Even if a reception error has not been detected for some reason despite the occurrence of a reception error due to loss of synchronization, the encoding process and the decoding process can be performed by periodically transmitting and receiving a code decoding synchronization signal. Synchronization between them can be re-established. Thus, in this embodiment, the synchronization between the encoding process and the decoding process can be made more reliable, and reception errors can be suppressed.

Further, in the transmission / reception system 1A shown in the present embodiment, as shown in FIG. 3, the receiving device 20A may have an error detection unit 24 and the transmission device 10A may have a reset instruction unit 15, or FIG. As illustrated, the transmission device 10 </ b> A may include an error detection unit 14 and a reset instruction unit 15. Whether the transmission device 10A has the error detection unit 14 (24) and the reset instruction unit 15 (25) or the reception device 20A can be changed as appropriate according to the system to which it is applied. In the transmission / reception system 1A as shown in FIG. 1, since error detection is detected most promptly on the receiving side, measures are taken to handle downstream data so as not to cause problems at the later stage when handling data containing errors. Can be performed. Further, in the transmission / reception system 1A as shown in FIG. 3, the error detection signal can be delivered with a low-speed signal, so that the transmission path 33 can be realized with a low cost. Furthermore, in the transmission / reception system 1A as shown in FIG. 4, it is possible to suppress the reception error by changing the mounting only of the transmission device 10A, and therefore it is possible to realize the system even if the reception device 20A is an existing one. Note that the

error detection units

14 and 24 and the

reset instruction units

15 and 25 have the same functions, respectively, and thus the description of their operations is omitted here.
(Second Embodiment)

FIG. 5 is a diagram showing a configuration of the transmission / reception system 1B of the second embodiment. The transmission / reception system 1B includes a transmission device 10B and a reception device 20B. The transmission device 10B and the reception device 20B transmit and receive data via the signal transmission paths 31 to 33.

The transmission / reception system 1B of the present embodiment provides a data delimiter that gives timing for initializing a synchronization signal from the transmission device 10B to the reception device 20B, for example, when transmitting / receiving horizontal synchronization data and vertical synchronization data in addition to effective image data. A signal is also transmitted. This data delimiter signal is a signal for setting the random number of the synchronization signal to the initial value at the moment of toggle, and in this embodiment, the random number of the synchronization signal is set to the initial value at the rising edge. The transmission / reception system 1B of the present embodiment uses this data delimiter signal when transmitting and receiving a reset instruction signal and an encoding / decoding synchronization signal between the transmission device 10B and the reception device 20B. Compared to the configuration of the transmission device 10A in the first embodiment, the transmission device 10B in the second embodiment is different in that it further includes a data delimiter signal correction unit 16, and is different in the operation of the encoding unit 11. To do.

The receiving device 20B includes a decoding unit 21, a deserializer 22, a receiving unit 23, an error detecting unit 24, a reset instruction unit 25, and a data delimiter signal restoring unit 26. Compared with the configuration of the receiving device 20A in the first embodiment, the receiving device 20B in the second embodiment is different in that it further includes a data delimiter signal restoration unit 26, and also in the operation of the reset instruction unit 25. To do.

The reset instruction unit 25 of the receiving device 20B outputs a signal whose level repeatedly toggles over a certain period as a reset instruction signal to the signal transmission path 33.

The data delimiter signal correction unit 16 of the transmission apparatus 10B receives a signal whose level repeatedly toggles over a certain period as a reset instruction signal from the reset instruction unit 24 of the reception apparatus 20B, and the original data according to the level of the reset instruction signal. The level of the data delimiter signal is corrected, and the corrected data delimiter signal is output to the encoding unit 11. For example, the data delimiter signal correction unit 16 includes an EXNOR circuit that inputs a reset instruction signal and an original data delimiter signal and outputs a corrected data delimiter signal as an EXNOR logical operation result of both signals.

When the encoding unit 11 of the transmission device 10B receives the corrected data delimiter signal from the data delimiter signal correction unit 16, the encoding unit 11 transmits the encoded decoding synchronization signal as encoded data from the transmission unit 13 to the reception device 20B and the correction. The subsequent data delimiter signal is also transmitted as encoded data from the transmission unit 13 to the reception device 20B.

The data delimiter signal restoration unit 26 of the receiving device 20B is configured to repeatedly toggle the level of the data delimiter signal over a certain period of data received by the receiving unit 23 from the transmitting device 10B (that is, converted into a corrected data delimiter signal). The data delimiter signal level in the period is converted to a certain level before the period (that is, converted into the original data delimiter signal), and the converted data delimiter signal is output.

FIG. 6 is a diagram illustrating a waveform example of each signal in the transmission / reception system 1B of the second embodiment. In the figure, (a) data received by the receiving device 20B, (b)
The original data delimiter signal input to the transmission device 10B, (c) the reset instruction signal output from the reset instruction unit 25 of the reception device 20B, (d) the data delimiter signal restoration unit 26 of the reception device 20B is held internally. (E) a corrected data delimiter signal including a reset instruction signal input to the data delimiter signal restoring unit 26 of the receiving device 20B, and (f) an output from the data delimiter signal restoring unit 26 of the receiving device 20B. The original data delimiter signals and their respective waveforms are shown.

In the example shown in the figure, the data transmitted from the transmitting apparatus 10B to the receiving apparatus 20B is valid data, and the original data delimiter signal input to the transmitting apparatus 10B initializes the synchronization signal at the rising timing. After that, it became high level ((b) in the figure). If the encoded data sent from the transmission device 10B to the reception device 20B is garbled due to the transmission quality deterioration of the

signal transmission paths

31, 32 or the influence of external noise, the error detection unit 24 of the reception device 20B detects the occurrence of a reception error. Then, the reset instruction unit 25 outputs a reset instruction signal whose level repeatedly toggles over a certain period ((c) in the figure). Further, the data delimiter signal restoration unit 26 sets an error flag to be held internally for a predetermined period from when this reception error detection is received ((d) in the figure).

When receiving the reset instruction signal output from the reset instruction unit 25 of the receiving apparatus 20B, the data delimiter signal correcting unit 16 of the transmitting apparatus 10B corrects the original data delimiter signal level according to the level of the reset instruction signal. Then, the corrected data delimiter signal is output. The level of the data delimiter signal input to the data delimiter signal restoration unit 26 of the receiving device 20B changes due to the transmission quality deterioration of the

signal transmission paths

31 and 32 and the influence of external noise. This is a corrected data delimiter signal that toggles repeatedly ((e) in the figure). At this time, since the error flag held internally is set, the data delimiter signal restoration unit 26 converts the corrected data delimiter signal into the original data delimiter signal and outputs the converted data delimiter signal ( (F) in FIG.

Note that the data delimiter signal restoration unit 26 converts the corrected data delimiter signal into an original data delimiter signal by removing a component that toggles for a period shorter than a certain period without using an error flag. Also good.

In addition, the decoding unit 21 of the reception device 20B receives the code decoding synchronization signal together with the corrected data delimiter signal from the transmission device 10B, initializes the synchronization between the encoding process and the decoding process, and reestablishes the synchronization. Then, the subsequent decoding process is performed. When the synchronization is re-established, the data obtained by the decryption process of the decryption unit 21 is the same as the original data.

The transmission / reception system 1B of the second embodiment can achieve the same effects as the transmission / reception system 1A of the first embodiment.

The synchronization between the encoding process and the decoding process can be applied to the purpose of suppressing reception errors by making the synchronization more reliable.

1A, 1B Transmission /

reception system

10A, 10B Transmission device 11 Encoding unit 12 Serializer 13 Transmission unit 14 Error detection unit 15 Reset instruction unit 16 Data delimiter

signal correction unit

20A, 20B Reception device 21 Decoding unit 22 Deserializer 23 Reception unit 24 Error detection Unit 25 reset instruction unit 26 data delimiter signal restoration unit 31 to 33 signal transmission path

Claims

An encoding unit that generates encoded data by encoding data to be transmitted to the receiving device;
A transmission unit for transmitting the encoded data to the reception device;
With
The encoding unit periodically transmits the synchronization signal for establishing synchronization between the encoding process of the encoding unit and the decoding process of the receiving device as encoded data from the transmitting unit to the receiving device. And transmitting the synchronization signal as encoded data from the transmission unit to the reception device in order to reestablish synchronization between the encoding process and the decoding process when a reception error occurs in the reception device. A transmission device characterized by the above.
When the encoding unit receives a reset instruction signal generated from the receiving apparatus to reestablish synchronization between the encoding process and the decoding process when a reception error occurs in the receiving apparatus, the synchronization signal The transmission apparatus according to claim 1, wherein the transmission unit transmits the encoded data as encoded data from the transmission unit to the reception apparatus.
When a reception error detection signal indicating that a reception error has occurred in the reception device is received from the reception device, a reset instruction signal for re-establishing synchronization between the encoding process and the decoding process is generated, A reset instruction unit that transmits a reset instruction signal to the encoding unit;
When the encoding unit receives the reset instruction signal, the synchronization signal is transmitted from the transmission unit to the reception device as encoded data.
The transmission apparatus according to claim 1.
A reception error detection unit that detects that a reception error has occurred in the reception device, generates a reception error detection signal, and transmits the reception error detection signal;
A reset instruction unit that generates a reset instruction signal for re-establishing synchronization between the encoding process and the decoding process when the reception error detection signal is received, and transmits the reset instruction signal to the encoding unit When,
With
When the encoding unit receives the reset instruction signal, the synchronization signal is transmitted from the transmission unit to the reception device as encoded data.
The transmission apparatus according to claim 1.
A signal that repeatedly toggles the level over a certain period is received as the reset instruction signal from the receiving device, the level of the data delimiter signal is corrected according to the level of the reset instruction signal, and the corrected data delimiter signal is output Further comprising a data delimiter signal correction unit,
When the encoding unit receives the corrected data delimiter signal from the data delimiter signal correcting unit, the encoding unit transmits the synchronization signal as encoded data from the transmitting unit to the receiving device, and the corrected data delimiter A signal is also transmitted as encoded data from the transmission unit to the reception device,
The transmission apparatus according to claim 2, wherein:
A receiving unit that receives encoded data transmitted from the transmitting device;
A decoding unit for decoding the encoded data received by the receiving unit and outputting the original data;
With
When the decoding unit receives a synchronization signal for establishing synchronization between the encoding process of the transmission device and the decoding process of the decoding unit as encoded data from the transmission device by the reception unit In addition, the synchronization between the encoding process and the decoding process is established, and the synchronization between the encoding process and the decoding process is performed when a reception error occurs in the data output from the decoding unit. When the receiver receives the synchronization signal for re-establishment as encoded data from the transmitting device, the synchronization between the encoding process and the decoding process is initialized once to re-establish the synchronization. A receiving apparatus that performs a decoding process.
A reception error detection unit that detects that a reception error has occurred in the reception device, generates a reception error detection signal, and transmits the reception error detection signal;
A reset instruction unit that receives the reception error detection signal, generates a reset instruction signal for transmitting the synchronization signal as encoded data from the transmission unit to the reception device, and transmits the reset instruction signal to the encoding unit; ,
The receiving device according to claim 6, further comprising:
A reception error detection unit that detects that a reception error has occurred in the reception device and generates a reception error detection signal and transmits the reception error detection signal,
Transmitting the reception error detection signal to the transmission device;
The receiving apparatus according to claim 6.
[Correction based on Rule 91 19.09.2012]
Transmitting the original data decrypted by the decryption unit to the transmission device;
The receiving apparatus according to claim 6.
The reset instruction unit outputs a signal that repeatedly toggles the level over a certain period as the reset instruction signal,
When the level of the data delimiter signal repeatedly toggles over a certain period of the data received by the receiver from the transmitter, the level of the data delimiter signal in the period is converted to a certain level before the period A data delimiter signal restoration unit that outputs the converted data delimiter signal;
The receiving apparatus according to claim 7.
A transmission device according to claim 2 and a reception device according to claim 7, wherein the encoded data is transmitted from the transmission device to the reception device, and the reset instruction signal is transmitted from the reception device to the transmission device. A transmission / reception system characterized by that.
A transmission device according to claim 3 and a reception device according to claim 8, wherein the encoded data is transmitted from the transmission device to the reception device, and the reception error detection signal is transmitted from the reception device to the transmission device. A transmission / reception system characterized by that.
A transmission device according to claim 4 and a reception device according to claim 9, wherein the encoded data is transmitted from the transmission device to the reception device, and data after decoding processing is transmitted from the reception device to the transmission device. A transmission / reception system characterized by that.
A transmission device according to claim 5 and a reception device according to claim 10, wherein the encoded data is transmitted from the transmission device to the reception device, and the data delimiter signal is transmitted from the reception device to the transmission device. A transmission / reception system characterized by that.