JPS54124663A - Pcm modulation/demodulation system - Google Patents
Pcm modulation/demodulation systemInfo
- Publication number
- JPS54124663A JPS54124663A JP3267378A JP3267378A JPS54124663A JP S54124663 A JPS54124663 A JP S54124663A JP 3267378 A JP3267378 A JP 3267378A JP 3267378 A JP3267378 A JP 3267378A JP S54124663 A JPS54124663 A JP S54124663A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- signal
- pcm
- level
- level control
- 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.)
- Pending
Links
Abstract
PURPOSE: To fix the number of coded bits to make even a signal, which changes the level greatly, within a fixed quantizing noise, by changing a coding maximum range on a basis of signal hysteresis in the PCM modulation/demodulation system.
CONSTITUTION: An input analogue signal is inputted from terminal 11 and is set to a proper level by level converter circuit 13 on a basis of the gain setting signal from level control circuit 14 and is converted to a PCM signal through filter 15, sampling circuit 16 and PCM coding circuit 17. This PCM signal is stored as a past l-times sample code string in PCM mamory circuit 19, and l-number memory data are compared with a prescribed constant successively in test circuit 21, and level control circuit 14 is controlled according to the comparison result. In case of demodulation, the PCM signal is inputted from terminal 22, and circuit 27 is controlled by code memory circuit 31, test circuit 32 and level control circuit 29.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3267378A JPS54124663A (en) | 1978-03-20 | 1978-03-20 | Pcm modulation/demodulation system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3267378A JPS54124663A (en) | 1978-03-20 | 1978-03-20 | Pcm modulation/demodulation system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54124663A true JPS54124663A (en) | 1979-09-27 |
Family
ID=12365384
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3267378A Pending JPS54124663A (en) | 1978-03-20 | 1978-03-20 | Pcm modulation/demodulation system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54124663A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56146313A (en) * | 1980-04-15 | 1981-11-13 | Victor Co Of Japan Ltd | Compressing and expanding system of digital modulated wave |
JPS57129549A (en) * | 1981-02-04 | 1982-08-11 | Sony Corp | Signal transmission system |
JPS5853223A (en) * | 1981-09-25 | 1983-03-29 | Fuji Facom Corp | Fault informing system |
JPS58218245A (en) * | 1982-05-05 | 1983-12-19 | ドルビ・ラボラトリ−ズ・ライセンシング・コ−ポレ−シヨン | Analog and digital signal device |
JPH0372721A (en) * | 1989-05-22 | 1991-03-27 | Seikosha Co Ltd | Method and device for recording and reproducing |
-
1978
- 1978-03-20 JP JP3267378A patent/JPS54124663A/en active Pending
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56146313A (en) * | 1980-04-15 | 1981-11-13 | Victor Co Of Japan Ltd | Compressing and expanding system of digital modulated wave |
JPS6313576B2 (en) * | 1980-04-15 | 1988-03-26 | Victor Company Of Japan | |
JPS57129549A (en) * | 1981-02-04 | 1982-08-11 | Sony Corp | Signal transmission system |
JPS5853223A (en) * | 1981-09-25 | 1983-03-29 | Fuji Facom Corp | Fault informing system |
JPS58218245A (en) * | 1982-05-05 | 1983-12-19 | ドルビ・ラボラトリ−ズ・ライセンシング・コ−ポレ−シヨン | Analog and digital signal device |
JPH0372721A (en) * | 1989-05-22 | 1991-03-27 | Seikosha Co Ltd | Method and device for recording and reproducing |
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