JPS5570146A - Adpcm system and device used for said system - Google Patents

Adpcm system and device used for said system

Info

Publication number
JPS5570146A
JPS5570146A JP14398178A JP14398178A JPS5570146A JP S5570146 A JPS5570146 A JP S5570146A JP 14398178 A JP14398178 A JP 14398178A JP 14398178 A JP14398178 A JP 14398178A JP S5570146 A JPS5570146 A JP S5570146A
Authority
JP
Japan
Prior art keywords
code
adaptive
decision circuit
signal
backward
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
JP14398178A
Other languages
Japanese (ja)
Inventor
Kazunori Ozawa
Taku Arazeki
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP14398178A priority Critical patent/JPS5570146A/en
Publication of JPS5570146A publication Critical patent/JPS5570146A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B14/00—Transmission systems not characterised by the medium used for transmission
    • H04B14/02—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation
    • H04B14/06—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using differential modulation, e.g. delta modulation
    • H04B14/066—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using differential modulation, e.g. delta modulation using differential modulation with several bits [NDPCM]
    • H04B14/068—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using differential modulation, e.g. delta modulation using differential modulation with several bits [NDPCM] with adaptive feedback

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)

Abstract

PURPOSE:To secure a quick recovery for the effect of the transmission code error through a simple device constitution by deciding the predictive coefficient of the adaptive predicting unit via the code decision circuit for transmission after correction to the prescribed value and then deciding the predictive coefficient via the code decision circuit of the reception side. CONSTITUTION:The difference is obtained by subtractor 110 between the input signal of input terminal 105 and the output of backward-type adaptive predicting unit 150, and this differential signal is applied to adaptive quantizer 120 to perform encoding of the input signal. The quantized code is applied to backward quantization step size correction circuit 170, adaptive reverse quantizer 130 and encoder 180 each. And the output encoded through encoder 180 is transmitted to the reception side, and at the same time the adaptability for encoding is decided at code decision circuit 190 to give the control to unit 150. At the reception side, the signal is decoded via decoder 230 and then decided through code decision circuit 220 to be applied to backward-type predictive coefficient value correction circuit 280. And the signal decoded at decoder 230 is corrected to control adaptive predicting unit 270 to secure the recovery for the transmission code error.
JP14398178A 1978-11-21 1978-11-21 Adpcm system and device used for said system Pending JPS5570146A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14398178A JPS5570146A (en) 1978-11-21 1978-11-21 Adpcm system and device used for said system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14398178A JPS5570146A (en) 1978-11-21 1978-11-21 Adpcm system and device used for said system

Publications (1)

Publication Number Publication Date
JPS5570146A true JPS5570146A (en) 1980-05-27

Family

ID=15351532

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14398178A Pending JPS5570146A (en) 1978-11-21 1978-11-21 Adpcm system and device used for said system

Country Status (1)

Country Link
JP (1) JPS5570146A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61214828A (en) * 1985-03-20 1986-09-24 Mitsubishi Electric Corp Inserting device for difference encoded digital sound signal

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61214828A (en) * 1985-03-20 1986-09-24 Mitsubishi Electric Corp Inserting device for difference encoded digital sound signal
JPH0588575B2 (en) * 1985-03-20 1993-12-22 Mitsubishi Electric Corp

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