JPS5446018A - Pcm signal demodulator - Google Patents
Pcm signal demodulatorInfo
- Publication number
- JPS5446018A JPS5446018A JP11291477A JP11291477A JPS5446018A JP S5446018 A JPS5446018 A JP S5446018A JP 11291477 A JP11291477 A JP 11291477A JP 11291477 A JP11291477 A JP 11291477A JP S5446018 A JPS5446018 A JP S5446018A
- Authority
- JP
- Japan
- Prior art keywords
- crc
- muting
- pcm signal
- error
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Signal Processing For Digital Recording And Reproducing (AREA)
- Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)
Abstract
PURPOSE: To perform stable demodulation by turning OFF muting circuits only when the errors of the PCM signal at the demodulation cannot be corrected.
CONSTITUTION: The vertical synchronizing signal of the PCM signal reproduced with a VTR, etc. is separated by a separator circuit 21, by which the phase lock loop circuit PLL formed by a clock pulse generator 33, data synchronzing circuit 37, pulse generating circuit 36 is locked and the error detection of the PCM signal is accomplished by a CRC 23. When the CRC 23 detectes an error, the word having the error is corrected by interpolation of the words before and after the PCM signal having the error by way of mean value interpolation circuits 28L, 28R. If many of the errors detected by the CRC 23 occur owing to continuous drop-out, etc. and the word correction is infeasible, the muting contorl circuit 39 to which the error detection outputs of the CRC 23 are applied generates the conrrol signal to turn OFF muting switches 29L, 29R while the PLL is held locked even if the error detection signals disappear. Hence, repetition of ON and OFF, etc. of detrimental muting at the time of nustable playback mode, etc. does not occur and stable demodulation is performed
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11291477A JPS6052507B2 (en) | 1977-09-20 | 1977-09-20 | PCM signal demodulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11291477A JPS6052507B2 (en) | 1977-09-20 | 1977-09-20 | PCM signal demodulator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5446018A true JPS5446018A (en) | 1979-04-11 |
| JPS6052507B2 JPS6052507B2 (en) | 1985-11-19 |
Family
ID=14598638
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11291477A Expired JPS6052507B2 (en) | 1977-09-20 | 1977-09-20 | PCM signal demodulator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6052507B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55157114A (en) * | 1979-05-23 | 1980-12-06 | Matsushita Electric Ind Co Ltd | Muting circuit |
| JPS56107315A (en) * | 1980-01-28 | 1981-08-26 | Sanyo Electric Co Ltd | Muting device |
| JPS5787327U (en) * | 1980-11-14 | 1982-05-29 | ||
| JPS61110380A (en) * | 1984-11-02 | 1986-05-28 | Hitachi Ltd | Sound signal recoding and reproducing device |
-
1977
- 1977-09-20 JP JP11291477A patent/JPS6052507B2/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55157114A (en) * | 1979-05-23 | 1980-12-06 | Matsushita Electric Ind Co Ltd | Muting circuit |
| JPS56107315A (en) * | 1980-01-28 | 1981-08-26 | Sanyo Electric Co Ltd | Muting device |
| JPS6356629B2 (en) * | 1980-01-28 | 1988-11-08 | Sanyo Electric Co | |
| JPS5787327U (en) * | 1980-11-14 | 1982-05-29 | ||
| JPS61110380A (en) * | 1984-11-02 | 1986-05-28 | Hitachi Ltd | Sound signal recoding and reproducing device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6052507B2 (en) | 1985-11-19 |
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