KR960005747B1 - Error and mute manage circuit - Google Patents

Abstract

first and second data input unit(1,2) for receiving a data of TV sound transmitting mode "0" and "1" to send a shifted output; first and second error checking units(3,4) for sending an error checking, preset or clear signal by checking an error of the transmission mode data; reset processing unit(5) for processing a preset or clear signal by receiving a signal from the first error checking unit(3); data output unit(6) for sending a reproduced reset data by reset signals after presetting by the reset processing unit(5) and the second error checking unit(4); and audio mute processing unit(7) for producing audio mute by receiving error checking signals when error happens, thereby processing an audio data without reducing the dynamic range.

Description

Error detection and silence processing device for digital transmission of audio multiplex TV audio

1 is a block diagram of an embodiment of an error detection and silence processing apparatus for digital transmission of voice multiplex TV audio according to the present invention.

2 is a timing diagram of an error detection and silence processing apparatus for digital transmission of multiplex TV audio according to the present invention.

* Explanation of symbols for main parts of the drawings

1: first data input unit 2: second data input unit

3: first transmission error monitoring unit 4: second transmission error monitoring unit

5: reset processing section 6: data output section

7: audio mute processing unit

The present invention can silently process audio data when an error occurs by detecting an error in the received TV audio transmission mode information without inserting a separate parity bit for error detection in the transmission of audio data of the audio multiplex TV audio data. The present invention relates to an error detection and silence processing apparatus for digital transmission of audio multiplex TV audio.

In the case of transmitting digital audio data of a voice multiplex method through a digital transmission path, parity data is usually inserted in preparation for an error. However, when bandwidth is limited so that only audio data can be transmitted, one bit of parity bits should be allocated for error detection, so that the bits allocated to audio data should be reduced by one bit, and the signal dynamic range of audio data should be reduced. There was a problem.

Therefore, in order to solve the above problems, the present invention, by detecting the TV audio transmission mode data transmitted together during the digital transmission of the audio multiplex TV audio data without inserting a separate parity bit, detects an error, an error occurs It is an object of the present invention to provide an error detection and mute processing apparatus that can mute the output audio data.

The present invention for achieving the above object, the first data input means for receiving the transmission mode data '0' of the audio multi-TV audio from the outside and shifted according to the control clock and output, the transmission mode data of the audio multi-TV audio from the outside A second data input means for receiving '1' and shifting the output according to the control clock, and outputting an error monitoring signal, a preset or a clear signal by receiving the transmission mode data of the first data input means and monitoring for an error; A second transmission error monitoring means for receiving the transmission mode data of the first transmission error monitoring means and the second data input means and monitoring whether there is an error and outputting an error monitoring signal or a preset or clear signal; Receiving the preset and clear signals from the first transmission error monitoring means. Reset processing means for outputting the data; preset by the preset signal of the reset processing means and the preset signal of the second transmission error monitoring means, and reset and reproduced by the reset signals of the first and second transmission error monitoring means. And an audio mute processing means for muting the audio when the error occurs by receiving the error monitoring signals of the first and second transmission error monitoring means.

The multiplex TV audio can be transmitted in stereo transmission mode for stereo music programs, bilingual transmission mode for news or foreign movie programs, and mono transmission mode for mono programs.

Therefore, audio data transmitted digitally requires two bits to indicate the type of audio program transmitted, that is, the transmission mode.

In general, when audio data is transmitted digitally, auxiliary information and audio data related to the audio data are multiplexed and serially transmitted. Therefore, when an error occurs irregularly, an error may be generated with the same probability in audio data and auxiliary information.

In addition, the TV audio transmission mode data is data which does not change within a single program. However, since the variation of the supplied program types occurs irregularly, the TV audio transmission mode data receives a delay of the TV audio transmission mode data so that the transmission does not affect the output audio signal. Should be. That is, it should be transmitted once every four samples.

Therefore, if the type of the transmitted program is changed and the TV audio transmission mode data is changed to another state, the same state is maintained for the period of the program ending from the conversion point. However, if the TV audio transmission mode data is converted due to an error in transmission, the state is changed at the time of the error, and the conversion from the error state to the original state occurs again when the next error does not occur. That is, if the state of the data changes frequently by monitoring the TV audio transmission mode data, it can be determined that an error has occurred.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

1 is a configuration diagram of an error detection and silence processing apparatus for digital transmission of audio multiplex TV audio according to an embodiment of the present invention. In the drawings, reference numeral 1 denotes a first data input unit, 2 denotes a second data input unit, and The first transmission error monitoring unit, 4 is a second transmission error monitoring unit, 5 is a reset processing unit, 6 is a data output unit, and 7 is an audio mute processing unit.

Looking at the configuration of the present invention, the present invention is the first and second data input unit (1, 2) receiving the transmission mode data of the audio multiple TV audio, the first and second transmission error for monitoring whether the input data error The monitoring unit 3, 4, a reset processing unit 5 for outputting a reset signal, a data output unit 6 for outputting reproduced data, and an audio muting processing unit 7 for processing audio mute when an error occurs.

In addition, the first and second data inputs 1 and 2 are composed of four flip-flops and a shift register for shifting input data according to a control clock. The first and second transmission error monitors 3 And 4) are negative AND gates 31 and 41 for receiving and outputting the shifted data of the shift registers and outputting them in a negative OR, and OR gates 32 and 42 for receiving and ORing the shifted data of the shift registers. And an AND gate 33 and 43 for receiving an output of the negative AND gates 31 and 41 and an output of the OR gates 32 and 42, and performing an AND operation to output an error monitoring signal to the audio silencer 7. And the OR gates 34 and 44 that receive the OR of the outputs of the OR gates 32 and 42 and the inverted initialization signal of the reset processing unit 5 to perform an OR, and output a clear signal to the data output unit 6. Is composed of .

The reset processor 5 receives a flip-flop 51 that receives an initialization signal from the outside according to a control clock, an output of the flip-flop 51, and a negative AND gate 31 of the first transmission error monitor 3. A logical multiplication gate 52 for receiving and outputting a multiplication output to the data output unit 6, and inverting the flip-flop output to the first and second transmission error monitoring units 3 and 4. It consists of an inverter 53 which outputs to.

The data output unit 6 is preset by the output of the AND gate 52 of the reset processing unit 5 and is cleared and reproduced by the output of the OR gate 34 of the first transmission error monitoring unit 3. The first flip-flop 61 for outputting the data, and the output of the negative AND gate 41 of the second transmission error monitoring unit 4, and is preset by the output of the second transmission error monitoring unit 4. And a second flip-flop 62 which outputs data which is cleared by the output of the OR gate 44 and reproduced.

The audio mute processing unit 7 inverts the external initialization signal and outputs the first inverter 71, the output of the first inverter 71, and the logic of the first and second transmission error monitoring units 3 and 4. A first OR gate 72 for receiving the outputs of the product gates 33 and 43 and performing a logical OR to output a clear signal, which is cleared by the output of the first OR gate 72, and counted and output according to a control clock. A second logic sum gate 74 for receiving a counter 73, an output of the counter 73, and performing a logic sum; and a second inverter 75 for inverting and outputting the output of the second logic sum gate 74; and And a logical AND gate 76 which receives the output of the second inverter 75 and the external audio data and logically outputs the result.

Referring to FIG. 2, the operation of the present invention configured as described above will be described. Referring to FIG. 2, two bits of the transmission mode data '0' of the audio multiple TV audio input and the transmission mode data '1' of the audio multiple TV audio input as shown in the drawing. Is input to the first and second data inputs 1 and 2 composed of four shift registers and shifted according to the control clock to be output. If the state of the transmission mode data '0' or data '1' of the audio multi-TV audio is changed due to the change of the type of program to be transmitted, after 4 clocks, the first and second data input units 1 and 2 have the same state. do.

Therefore, if the first and second data inputs 1 and 2 are equal to '1', they are '0' by the negative AND gates 31 and 41 of the first and second transmission error monitors 3 and 4. Is output and the flip-flops 61 and 62 of the data output section 6 are preset so that the state is '1' and equals to '0', the first and second transmission error monitors 3 and 4 The flip-flops 61 and 62 of the data output section 6 are set to '0' by the OR gates 32 and 42. That is, after four clocks, the state of the TV audio transmission mode data of the data output unit 6 reproduced and outputted is the same as that of the audio multiple TV audio transmission mode data inputted to the first and second data input units 1, 2. do.

In this state, the counter 73 is cleared by the logical sum gate 72 of the audio mute processing unit 7, so that the counter 73 maintains a '0000' state when the audio multiple TV audio transmission mode remains the same. Keep it.

When the type of program is changed and the state of the audio multi-TV audio transmission mode data is changed, the value of the counter 73 is increased for 4 clocks at the changed time point, and is cleared again after 4 clocks.

However, while the state of the audio multi-TV audio transmission mode data is frequently changed due to an error occurrence, the negative AND gates 31 and 41 and the AND gates 32 and 32 of the monitoring units 3 and 4 are transmitted in the first and second transmissions. The output of 42 will remain '1'.

When the outputs of the AND gates 31 and 41 and the AND gates 32 and 42 of the first and second transmission error monitors 3 and 4 remain at '1', the audio mute processing unit 7 Since the value of the OR gate 72 remains '1', the value of the counter 73 increases, so that '1' is output from the OR gate 74 and '0' is output through the inverter 75, and the counter ( The carry value of the counter 73 generated by increasing the value of 73 may load the control clock and keep the state of the inverter 75 at '0' when an error occurs.

Therefore, since the input audio data is logically multiplied through the output of the inverter 75 and the AND gate 76, the audio output can be muted by maintaining the value of the data output when an error occurs. have.

Accordingly, the present invention can silently process audio data when an error occurs by detecting an error in the received TV audio transmission mode information without inserting a separate parity bit for error detection in digital transmission of audio multiplex TV audio data. It is effective.

Claims (6)

First data input means (1) for receiving the transmission mode data '0' of the audio multi-TV audio from the outside and shifting the output data according to the control clock; Second data input means (2) for receiving the transmission mode data '1' of the audio multi-TV audio from the outside and shifting the output data according to the control clock; First transmission error monitoring means (3) which receives the transmission mode data of the first data input means (1) and monitors whether an error is detected and outputs an error monitoring signal, a preset or a clear signal; Second transmission error monitoring means (4) which receives the transmission mode data of the second data input means (2) and monitors whether an error is detected and outputs an error monitoring signal, a preset or a clear signal; Reset processing means (5) for receiving an initialization signal from the outside, receiving a preset and a clear signal from the first transmission error monitoring means (3), and outputting a preset signal and a clear signal; Preset by the preset signal of the reset processing means 5 and the preset signal of the second transmission error monitoring means 4, and reset by the reset signal of the first and second transmission error monitoring means 3, 4 Data output means (6) for outputting the reproduced data; And an audio mute processing means (7) for receiving the error monitoring signals of the first and second transmission error monitoring means (3, 4) and muting the audio when the error occurs. And a silencer. 2. The error detection apparatus according to claim 1, wherein the first and second data input means (1, 2) comprise a shift register configured by four flip-flops and shifting the input data according to a control clock. And a silencer. 3. The audio muting processing means (7) according to claim 2, further comprising: first inverting means (71) for inverting and outputting an external initialization signal; A first logical sum gate 72 for receiving the output of the first inverting means 71 and the error monitoring signals of the first and second transmission error monitoring means 3 and 4 and performing a logical OR to output a clear signal; Counting means (73), which is cleared by the output of the first logical sum means (72), counts and outputs according to a control clock; Second logical sum means (74) for receiving and outputting the output of the counting means (73); Second inverting means (75) for inverting and outputting the output of the second logical sum means (74); And logical AND means (76) for receiving and outputting the output of the second inverting means (75) and external audio data and outputting the result. 4. The negation according to claim 3, wherein the first and second transmission error monitoring means (3, 4) accepts the shifted data of the first and second data input means (1, 2) and outputs the result by a negative logical multiplication. Logical product means (31, 41); Logical sum means (32, 42) for receiving the OR of the shifted data of the first and second data input means (1, 2) and outputting the OR; The output of the logical AND means (31, 41) and the output of the logical OR means (32, 42) are received and logically output an error monitoring signal to the first logical OR means 72 of the audio mute processing means (7) Logical multiplication means (33, 43); And the logic sum means 34 and 44 for receiving the output of the logic sum means 32 and 42 and the inverted initialization signal of the reset processing means 5 to perform logic OR to output a clear signal to the data output means 6. Error detection and silence processing apparatus, characterized in that configured. 5. The apparatus as claimed in claim 4, wherein said reset processing means (5) comprises: flip-flop means (51) for receiving an initialization signal from the outside according to a control clock; Logical means for outputting the flip-flop means 51 receives and outputs the output of the negative logical multiplication means 31 of the first transmission error monitoring means 3 to output a preset signal to the data output means (6) 52; And inverting means (53) for inverting the output of said flip-flop means (51) and outputting it to said first and second transmission error monitoring means (3, 4). 6. The data output means (6) according to claim 5, wherein the data output means (6) is preset by the output of the logical product (52) of the reset processing means (5), and the logical sum means of the first transmission error monitoring means (3). A first flip-flop 61 which outputs data which is cleared and reproduced by the output of 34), and is preset by the output of the logical AND means 41 of the second transmission error monitoring means 4, And second flip-flop means (62) for outputting data cleared and reproduced by the output of the logical sum means (44) of the transmission error monitoring means (4).