JPS57116422A - Analog waveform modulating and demodulating circuit - Google Patents

Analog waveform modulating and demodulating circuit

Info

Publication number
JPS57116422A
JPS57116422A JP198681A JP198681A JPS57116422A JP S57116422 A JPS57116422 A JP S57116422A JP 198681 A JP198681 A JP 198681A JP 198681 A JP198681 A JP 198681A JP S57116422 A JPS57116422 A JP S57116422A
Authority
JP
Japan
Prior art keywords
register
period
circuit
opened
value
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
Application number
JP198681A
Other languages
Japanese (ja)
Other versions
JPS6255736B2 (en
Inventor
Hiroaki Suzuki
Itsuo Sasaki
Masakazu Kamichika
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co Ltd
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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP198681A priority Critical patent/JPS57116422A/en
Priority to US06/335,652 priority patent/US4532494A/en
Priority to DE8282300050T priority patent/DE3264340D1/en
Priority to EP82300050A priority patent/EP0056299B1/en
Publication of JPS57116422A publication Critical patent/JPS57116422A/en
Publication of JPS6255736B2 publication Critical patent/JPS6255736B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M3/00—Conversion of analogue values to or from differential modulation
    • H03M3/02—Delta modulation, i.e. one-bit differential modulation
    • H03M3/022—Delta modulation, i.e. one-bit differential modulation with adaptable step size, e.g. adaptive delta modulation [ADM]

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)

Abstract

PURPOSE:To decrease the number of elements of an IC and to reduce chip size, by using one arithmetic circuit on time-division basis. CONSTITUTION:One sampling period is divided into timing periods T1,T2 and T3. In the period T1, clocked inverters I1 and I2 are opened by clock pulses CP1 and CP2. Therefore, output data from an interval register 20 for appreciation is inputted to an arithmetic circuit 22, and the absolute value of a value in a register 20 is so decreased that an analog signal oscillates at the amplitude center of an analog output. In the period T2, clocked inverters I3 and I4 are opened by clock pulses CP3 and CP4. Therefore, the output data of a DELTA amount register 21 is applied to the circuit 22 to perform the arithmetic of the DELTA amount. In the period T3, the inverters I3 and I4 are opened by the pulses CP4 and CP1. Therefore, the high-order digit bit outputs of the registers 20 and 21 are supplied to the circuit 22 to increase or decrease the DELTA amount to the value of the register 20.
JP198681A 1981-01-09 1981-01-09 Analog waveform modulating and demodulating circuit Granted JPS57116422A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP198681A JPS57116422A (en) 1981-01-09 1981-01-09 Analog waveform modulating and demodulating circuit
US06/335,652 US4532494A (en) 1981-01-09 1981-12-30 Adaptive delta codec which varies a delta signal in accordance with a characteristic of an input analog signal
DE8282300050T DE3264340D1 (en) 1981-01-09 1982-01-06 Circuit for generating a delta value
EP82300050A EP0056299B1 (en) 1981-01-09 1982-01-06 Circuit for generating a delta value

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP198681A JPS57116422A (en) 1981-01-09 1981-01-09 Analog waveform modulating and demodulating circuit

Publications (2)

Publication Number Publication Date
JPS57116422A true JPS57116422A (en) 1982-07-20
JPS6255736B2 JPS6255736B2 (en) 1987-11-20

Family

ID=11516807

Family Applications (1)

Application Number Title Priority Date Filing Date
JP198681A Granted JPS57116422A (en) 1981-01-09 1981-01-09 Analog waveform modulating and demodulating circuit

Country Status (1)

Country Link
JP (1) JPS57116422A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59161120A (en) * 1983-02-22 1984-09-11 アメリカン・マイクロシステムズ・インコ−ポレイテッド Method and device for controlling integral signal cvsd type codec
JPS61210725A (en) * 1985-03-14 1986-09-18 Fujitsu Ltd Differential pcm coding and decoding circuit for multiplex processing

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52100963A (en) * 1976-02-20 1977-08-24 Hitachi Ltd 1-bit encoder
JPS52100964A (en) * 1976-02-20 1977-08-24 Hitachi Ltd 1-bit encoder

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52100963A (en) * 1976-02-20 1977-08-24 Hitachi Ltd 1-bit encoder
JPS52100964A (en) * 1976-02-20 1977-08-24 Hitachi Ltd 1-bit encoder

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59161120A (en) * 1983-02-22 1984-09-11 アメリカン・マイクロシステムズ・インコ−ポレイテッド Method and device for controlling integral signal cvsd type codec
JPH0444850B2 (en) * 1983-02-22 1992-07-23 Amerikan Maikuro Shisutemusu Inc
JPS61210725A (en) * 1985-03-14 1986-09-18 Fujitsu Ltd Differential pcm coding and decoding circuit for multiplex processing

Also Published As

Publication number Publication date
JPS6255736B2 (en) 1987-11-20

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