JPS54124663A - Pcm modulation/demodulation system - Google Patents

Pcm modulation/demodulation system

Info

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
Application number
JP3267378A
Other languages
Japanese (ja)
Inventor
Takeo Koinuma
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP3267378A priority Critical patent/JPS54124663A/en
Publication of JPS54124663A publication Critical patent/JPS54124663A/en
Pending legal-status Critical Current

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
JP3267378A 1978-03-20 1978-03-20 Pcm modulation/demodulation system Pending JPS54124663A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (6)

* Cited by examiner, † Cited by third party
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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