JPS62266935A - Pcm sound receiving method - Google Patents

Abstract

PURPOSE:To mute the voice for a prescribed time as soon as an error is detected, and to reduce noise by providing an analog switch as a mute means, a multivibrator, a D/A converter and an error correction circuit or the like. CONSTITUTION:A data inputted to a bit counter 11 is sectioned at each word from an input clock, and inputted to an error correction circuit 16 via a serial/ parallel conversion section 13. The circuit 16 corrects one-bit error of the data, detects 2-bit error and a detection pulse is inputted to a multivibrator 15 via a counter 14. The vibrator 15 generates a pulse if plural errors exist in one frame over plural words to turn off an analog switch 19 as a mute means. Then a normal data is latched by a latch circuit 17 and converted into an analog signal by a D/A converter 18. When a pulse from the vibrator exists in such a way, the switch 19 is turned off to mute the voice for a prescribed time, thereby reducing the invasion of noise due to burst noise.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a PCM audio receiving method used when communicating PCM audio or music broadcasting using an 0ATV line or the like and decoding it on the receiver side.

2. Description of the Related Art Conventionally, many terminal devices have been developed to receive audio, music broadcasts, etc. in order to transmit high-quality audio or data, or to perform multiplexing. In order to prevent data errors from occurring on the transmission path and resulting in erroneous signals, error detection is performed by adding parity pits.

Furthermore, a method has been realized in which the number of additional bits is increased to perform 1-bit error correction and 2-bit error detection.

Problems to be Solved by the Invention However, in the above-mentioned conventional receiving device, when errors of VC4 bits or more occur continuously in one frame, such as burst errors, the error may pass through without being detected, resulting in noise. was the cause.

The present invention solves these conventional problems, and aims to provide an excellent PCM voice reception method that can detect errors and mute the voice for a certain period of time to reduce noise. It is something.

Means for Solving the Problems In order to achieve the above object, the present invention is provided with a data error detection circuit and a pulse counter. The system mutes the audio that has been decoded and converted into an analog signal.

In other words, according to the present invention, when multiple errors are detected in multiple words in one frame, it is determined that a burst error has occurred, and the error is detected not only in that frame but also in subsequent frames. By assuming that an error has occurred and muting the audio for a certain period of time, the computer will be protected from burst noise.
This has the effect of preventing M signals and ensuring good sound quality.

Embodiment FIG. 1 shows the configuration of an embodiment of the present invention. In FIG. 1, 11 is a pit counter, 12 is a word counter, 13 is a tray conversion unit, 14 is a counter, 15 is a triggerable monostable multi-byte break, 16 is an error correction circuit, 17 is a latch circuit, and 18 is a DA Converter, 19 is an analog switch, 20 is an amplifier circuit, and 21 is a speaker.

Next, the operation of the above embodiment will be explained. The data is divided word by word from the input clock by Bizotkau/Re11,
The word counter 12 determines that one frame has been reached based on the number of words, and then the tray converter 13 converts the input data using the shift clock and the word distinction pulse of the bit counter 11. The number of errors is counted by a parallel input data counter 14, and is reset by a word counter 12 every time one frame is completed. The error correction circuit 16 corrects 1-bit errors in the input data and detects 2-bit errors. When a 2-pin error detection pulse is sent, the counter 15 counts the number, and if a plurality of errors occur over a plurality of words in 17 frames, a pulse is generated and an analog switch 19 serving as a meet means is turned OFF. Normal data is latched by the latch circuit 17, converted to analog data by the DA converter 18, and if there is a pulse from the multivibrator 15, the analog switch 19 is turned OFF to mute the audio, and when there is no pulse, the analog switch 19 is turned OFF and the audio is muted. , the analog switch 19 is turned on, and the amplifier circuit 20 amplifies the signal and outputs it to the speaker 21.

In this manner, according to the above embodiment, the pulses generated by the multivibrator 15 cause the analog switch 1 to
0N10FFL has the advantage of being able to mute the audio for a certain period of time and preventing burst noise.

Effects of the Invention As is clear from the above embodiments, the present invention
When errors are detected in multiple words in a frame,
Since I configured the audio to be temporarily muted, my PC
When used in an M receiving terminal device, etc., it has the advantage of reducing noise intrusion due to burst noise.

Furthermore, the receiving method has the advantage that most of the infinite portions are composed of digital circuits and can be easily integrated into ICs.

[Brief explanation of drawings]

The drawing shows a PCM receiving method according to an embodiment of the present invention.
7) It is a block diagram of an apparatus. 1 Bit counter, 12... Word counter, 13
...Plate conversion, 14...Counter, 15...Multi-vibrator, 16...Error correction circuit, 17...Latch circuit, 18...DA converter, 19...Analog switch, 20... - Amplifier circuit, 21... speaker.

Claims (1)

[Claims] Used in a PCM audio communication system, when a data error detection circuit of a receiver detects a data error of multiple words in one frame, the receiver decodes the data for a certain period of time using a pulse generation circuit and mutes the audio signal output for a certain period of time. A PCM audio reception method that mutes the audio.