JPH08154084A - Digital transmitting and receiving method and device therefor - Google Patents

Abstract

PURPOSE: To provide a method for notifying the error of an inputted digital signal to a receiver and the device to be connected next without increasing information bits. CONSTITUTION: The parity of the data for which a format conversion is performed in a format conversion circuit 14 is generated in a parity generation circuit 16. When the error of the digital signal before the format conversion is not detected in a parity inspection circuit 13, the generated parity is added to data and the data is transmitted via a transmission line A. When the error is detected in the parity inspection circuit, the generated parity is inverted, the parity is added to data and the data is transmitted. On a reception side, when the error of a received digital signal is not detected, the parity of the data for which the format conversion is performed is added to data and the data is defined as a reception output signal on the reception side. When the error is detected, the parity for which the format conversion is performed on the reception side is inverted, the parity is added to data and the data is defined as a reception output signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital transmitting / receiving method for transmitting digital signals.

[0002]

2. Description of the Related Art In transmitting and receiving signals between respective devices of an audiovisual system, video signals and audio signals are digitized and transmitted.

FIG. 3 shows a conventional example of a digital transmitter and a digital receiver for multiplexing and transmitting a digital audio signal within a blanking period of a digital video signal. A digital video signal is input to the input end 300 of the digital transmitter TX, and an AES / E signal is input to the input end 301.
A digital audio signal of BU format is input.

A digital audio signal of AES / EBU format is converted into a parallel signal by a serial / parallel conversion circuit 302. The audio data converted into the parallel signal is input to the parity check circuit 303, where A
An error in the digital audio signal is detected by detecting the parity bit added to the ES / EBU format digital audio signal.

In the format conversion circuit 304, the digital audio data converted in parallel by the serial / parallel conversion circuit 302 is converted into a format suitable for multiplexing within the blanking period of the digital video signal input to the input terminal 300. And output.

Since the format conversion circuit 304 has thus converted the format, it is necessary to generate a parity for the newly converted digital audio data and add the generated parity bit. Therefore, the parity generation circuit 305 generates a parity bit for the format-converted digital audio signal and adds the parity bit to the format-converted digital audio data.

The multiplexing circuit 306 multiplexes the digital audio data converted into the format by the format conversion circuit 304 during the blanking period of the digital video signal input from the input terminal 300, and the digital audio data is transmitted via the transmission path A. Send to RX.

In the digital receiver RX, the separation circuit 3
At 07, the digital video signal and the digital audio data multiplexed within the blanking period of this digital video signal are separated. The separated digital video signal is output to the output terminal 312.

The digital audio data separated from the digital video signal by the separation circuit 307 is input to the parallel / serial conversion circuit 308 and serialized. In the parity check circuit 309, the parity bit generated in the parity generation circuit 305 of the digital transmitter TX and added to the digital voice data and transmitted is detected to detect an error in the transmission path A.

In the format conversion circuit 310, the digital audio data serialized by the parallel / serial conversion circuit 308 is format-converted into a digital audio signal of AES / EBU format, and the parity generation circuit 3 converts the format-converted digital audio data.
AES / E is added by adding the parity bit generated in 11.
Output terminal 313 for digital audio signal in BU format
Output to.

[0011]

In such a conventional transmission / reception method, when an error occurs in the digital voice signal input to the digital transmission device TX and no error occurs in the transmission line A, the digital transmission device. Although the TX detects an error, the digital receiving apparatus RX only detects the error in the transmission path A, so that the digital transmitting apparatus T
No error is detected in the digital audio signal input to X.

When the digital voice data input to the digital receiver RX is erroneous, an error is detected in the digital receiver RX, but the digital voice signal output from the digital receiver RX is related to the error. Since information is not added, there is a problem that an error is not detected in the device subsequent to the digital receiving device RX.

It is an object of the present invention to provide a digital transmission / reception method capable of notifying the occurrence of an error in an input digital signal to a device connected next without increasing the number of information bits.

[0014]

According to the digital transmission / reception method of the present invention, an error in a parity bit of a digital voice signal to be transmitted is detected, the digital voice signal is format-converted, and a predetermined parity is added to the digital voice signal for transmission. At this time, if no error is detected in the parity bit of the digital voice signal to be transmitted, the transmitting side generates the parity of the format-converted digital voice data, and the generated parity is converted into the digital voice data. When an error is detected in the parity bit of the digital audio signal to be added and transmitted, the parity of the format-converted digital audio data is generated, and the generated parity is inverted to generate the digital audio. Add the data and send it, and receive the sending signal from the sending side On the receiving side, if no error is detected in the parity bit of the received digital audio signal when converting the format of the received digital audio signal and adding a predetermined parity to form the received output signal, the receiving side The parity of the format-converted digital audio data is generated, the generated parity is added to the digital audio data as a reception output signal, and if an error in the parity bit of the received digital audio signal is detected, reception is performed. On the side, the parity of the digital voice data whose format is converted is generated, and the generated parity is inverted and added to the digital voice data to form a reception output signal.

[0015]

According to this structure, when an error occurs in the digital voice signal in the transmitting device, the newly generated parity bit is inverted and added to the digital voice data, so that the receiving device receives the error without increasing the information bits. Tell what happened.

When an error occurs in the digital voice data input to the receiver, the newly generated parity bit is inverted and added to the digital voice signal, so that it is connected after the receiver without increasing the information bits. Informs the device that an error has occurred.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The digital transmission / reception method of the present invention will be described below with reference to specific embodiments. 1 and 2 show a digital transmitter and a digital receiver based on the digital transmission / reception method of the present invention.

In the digital transmitter TX shown in FIG. 1, the signal input to the input terminal 10 is a digital video signal and the signal input to the input terminal 11 is a digital audio signal of AES / EBU format.

The digital audio signal input to the input terminal 11 is serial / parallel converted in the serial / parallel conversion circuit 12 and converted into a parallel signal. The parity check circuit 13 detects a parity bit included in the digital audio signal of AES / EBU format and detects an error in the input digital audio signal.

The digital audio data parallelized by the serial / parallel conversion circuit 12 is input to the format conversion circuit 14. The format conversion circuit 14
The parallel digital audio data is received, the digital video signal is converted into a format suitable for multiplexing in the blanking period, and a predetermined parity is added and output.

The parity generation circuit 16 generates and outputs a parity for the digital audio data converted into the format by the format conversion circuit 14. When no error is detected in the parity check circuit 13, the parity inversion circuit 15 outputs the parity bit generated and output in the parity generation circuit 16 as the predetermined parity to the format conversion circuit 14 as it is.

The parity inversion circuit 15 inverts the parity bit generated and output in the parity generation circuit 16 as the predetermined parity and inverts it to the format conversion circuit 14 when the parity check circuit 13 detects an error. Output.

The multiplexing circuit 17 multiplexes the digital audio data output from the format conversion circuit 14 and outputs it to the output end 18 within the blanking period of the digital video signal input from the input end 10.

In this way, when an error is detected in the digital voice signal input to the digital transmitter TX,
By inverting, adding and transmitting the newly generated parity bit, it is possible to notify the digital receiving device RX that an error has occurred in the digital transmitting device TX without increasing the information bits.

A digital receiving device RX for receiving a signal from the output end 18 via the transmission line A is constructed as shown in FIG. The output signal of the digital transmitter TX is input to the input end 20 of the separation circuit 21 via the transmission line A and the output end 18.

In the separating circuit 21, the received signal input to the input terminal 20 is converted into a digital video signal input to the input terminal 20 and digital audio data in a format suitable for multiplexing the digital video signal within the blanking period. To separate.

The parallel / serial conversion circuit 22 converts the digital audio data output from the separation circuit 21 into a serial signal. The parity check circuit 23 detects a parity bit included in the digital voice data output from the separation circuit 22 and detects an error in the digital voice data input to the digital receiver RX.

The format conversion circuit 24 receives the serialized digital audio data and converts it into an AES / EBU format digital audio signal. The parity generation circuit 26 generates a parity for the AES / EBU format digital audio signal output from the format conversion circuit 24.

When no error is detected in the digital voice data input to the digital receiving device RX in the parity check circuit 23, the parity inverting circuit 25 receives the AES / EBU in the format conversion circuit 24.
The parity bit generated and output by the parity generation circuit 25 is directly output to the format conversion circuit 24 as a predetermined parity to be added to the format digital audio signal. When an error is detected in the digital voice data input to the digital receiver RX by the parity check circuit 23, the parity inversion circuit 25 is used as the predetermined parity to be added to the AES / EBU format digital voice signal in the format conversion circuit 24.
Inverts the parity bit generated and output by the parity generation circuit 26 and outputs the inverted parity bit to the format conversion circuit 24.

In this way, the format conversion circuit 2
AES / with a predetermined parity added to the output end 28 of
EBU format digital audio signal is output,
The digital video signal is output to the output terminal 27.

Therefore, when an error is detected in the digital voice data input to the digital receiving device RX, the newly generated parity bit is inverted, added and output to be connected to the subsequent stage of the digital receiving device RX. It is possible to notify the existing device that an error has already occurred in the digital voice data at the stage of being input to the digital receiving device RX without increasing the information bits.

In the above description, the digital audio signal of AES / EBU format is used, but it can be applied to the case of a digital signal to which a parity bit is added.

[0033]

As described above, according to the present invention, when an error occurs in the digital voice signal in the transmitter, the parity bit newly generated is inverted and added to the digital voice data, so that the number of information bits is not increased. , It is possible to inform the receiving device that an error has occurred. further,
When an error occurs in the digital audio data input to the receiving device, the newly generated parity bit is inverted and added to the digital audio signal, so the error is not generated in the device connected after the receiving device without increasing the information bits. Can tell what happened.

[Brief description of drawings]

FIG. 1 is a block diagram of a digital transmission device based on a digital transmission / reception method of the present invention.

FIG. 2 is a block diagram of a digital receiving apparatus based on the digital transmission / reception method of the present invention.

FIG. 3 is a block diagram of a conventional digital transmitter and digital receiver.

[Explanation of symbols]

TX Digital transmitter RX Digital receiver A Transmission line 13 Parity check circuit on digital transmitter side 14 Format conversion circuit on digital transmitter side 15 Parity inversion circuit on digital transmitter side 16 Parity generation on digital transmitter side Circuit 23 Parity check circuit on digital transmitter side 24 Format conversion circuit on digital transmitter side 25 Parity inversion circuit on digital transmitter side 26 Parity generation circuit on digital transmitter side

Claims (5)

[Claims] 1. A digital voice signal to be transmitted, when detecting an error in a parity bit of the digital voice signal to be transmitted, converting the format of the digital voice signal and adding a predetermined parity to the transmission. If no parity bit error is detected,
When the parity of the format-converted digital voice data is generated, the generated parity is added to the digital voice data and transmitted, and when an error in the parity bit of the digital voice signal to be transmitted is detected, The parity of the format-converted digital audio data is generated, the generated parity is inverted and added to the digital audio data and transmitted, and the reception side that receives the transmission signal from the transmission side receives the received digital audio signal. When an error in the parity bit of the received digital audio signal is not detected when the format is converted into the received output signal by adding the specified parity, the parity of the format-converted digital audio data is received on the receiving side. Is generated, and the generated parity is used as the digital voice. If a parity bit error in the received digital audio signal is detected by adding it to the data output signal, the parity of the format-converted digital audio data is generated on the receiving side, and the generated parity is A digital transmission / reception method of inverting and adding to the digital voice data to form a reception output signal. 2. A parity check circuit for detecting an error in a parity bit of a digital voice signal to be transmitted, and a format conversion circuit for converting the format of the digital voice signal and adding a predetermined parity to a transmission signal.
A parity generation circuit that generates the parity of the digital audio data that has been format-converted by the format conversion circuit, and if the parity check circuit does not detect an error in the parity bit of the digital audio signal, the predetermined parity is used as the predetermined parity. The output of the parity generation circuit is output to the format conversion circuit, and when the parity check circuit detects an error in the parity bit of the digital audio signal, the output of the parity generation circuit is inverted as the predetermined parity and the format conversion is performed. A digital transmission device provided with a parity inversion circuit for outputting to a circuit. 3. A digital receiving apparatus for receiving a digital voice signal to which parity has been added, comprising: a parity check circuit for detecting an error in a parity bit of the received digital voice signal; and a format conversion of the received digital voice signal. A parity conversion circuit for adding a predetermined parity to generate a reception output signal, a parity generation circuit for generating the parity of the format-converted digital audio data, and a parity check circuit did not detect a parity bit error. In this case, the output of the parity generation circuit is output to the format conversion circuit as the predetermined parity, and when an error in the parity bit is detected in the parity check circuit, the output of the parity generation circuit is output as the predetermined parity. Is inverted and output to the format conversion circuit. A digital receiving device provided with a parity inversion circuit for inputting. 4. A digital audio signal to be transmitted is AE
3. The digital transmitter according to claim 2, wherein the digital audio signal is of S / EBU format. 5. The digital receiving apparatus according to claim 3, wherein the received output signal is a digital audio signal of AES / EBU format.