JPS55166338A - Pcm coding device - Google Patents

Pcm coding device

Info

Publication number
JPS55166338A
JPS55166338A JP7412379A JP7412379A JPS55166338A JP S55166338 A JPS55166338 A JP S55166338A JP 7412379 A JP7412379 A JP 7412379A JP 7412379 A JP7412379 A JP 7412379A JP S55166338 A JPS55166338 A JP S55166338A
Authority
JP
Japan
Prior art keywords
subtractor
noise
quantizer
filters
filter
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
JP7412379A
Other languages
Japanese (ja)
Other versions
JPS625378B2 (en
Inventor
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 JP7412379A priority Critical patent/JPS55166338A/en
Priority to US06/156,990 priority patent/US4354273A/en
Priority to CA000353752A priority patent/CA1149289A/en
Publication of JPS55166338A publication Critical patent/JPS55166338A/en
Publication of JPS625378B2 publication Critical patent/JPS625378B2/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
    • H03M3/04—Differential modulation with several bits, e.g. differential pulse code modulation [DPCM]
    • H03M3/042—Differential modulation with several bits, e.g. differential pulse code modulation [DPCM] with adaptable step size, e.g. adaptive differential pulse code modulation [ADPCM]

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)

Abstract

PURPOSE:To decrease greatly and visually the effect of the quantizing noise to the reproduced sound as well as miniaturize the scale of the device, by using the transversal filter for the predictor. CONSTITUTION:Aural signal Xj to be coded is supplied through terminal 1, and the predictive value including the quantizing noise is subtracted by subtractor 10 to be quantized through quantizer 20. The quantized signal is supplied to the differential pulse modulation DPCM decoder from terminal 2 as well as to subtractor 50 and filter 130. Subtractor 50 carries out the subtraction between the input and the output of quantizer 20, and the delivers output -nj equal to the noise component generated at quantizer 20 to then supply it to filter 70. Both filters 70 and 130 are formed with the transversal filters, and the sum of the outputs of filters 70 and 130 is applied to the subtractor in the form of the predictive value. As a result, the stability of the reception side is assured, and at the same time the high-range noise and the low-frequency noise can be eliminated to obtain an extremely high-quality sound.
JP7412379A 1979-06-12 1979-06-12 Pcm coding device Granted JPS55166338A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP7412379A JPS55166338A (en) 1979-06-12 1979-06-12 Pcm coding device
US06/156,990 US4354273A (en) 1979-06-12 1980-06-09 ADPCM System for speech or like signals
CA000353752A CA1149289A (en) 1979-06-12 1980-06-11 Adpcm system for speech or like signals

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7412379A JPS55166338A (en) 1979-06-12 1979-06-12 Pcm coding device

Publications (2)

Publication Number Publication Date
JPS55166338A true JPS55166338A (en) 1980-12-25
JPS625378B2 JPS625378B2 (en) 1987-02-04

Family

ID=13538105

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7412379A Granted JPS55166338A (en) 1979-06-12 1979-06-12 Pcm coding device

Country Status (1)

Country Link
JP (1) JPS55166338A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5995726A (en) * 1982-10-27 1984-06-01 ジ−メンス・アクチエンゲゼルシヤフト High speed dpcm encoder

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5995726A (en) * 1982-10-27 1984-06-01 ジ−メンス・アクチエンゲゼルシヤフト High speed dpcm encoder
JPS6320054B2 (en) * 1982-10-27 1988-04-26 Siemens Ag

Also Published As

Publication number Publication date
JPS625378B2 (en) 1987-02-04

Similar Documents

Publication Publication Date Title
JPS5550738A (en) Decoding method of adaptability forecasting type differential pulse code and its unit
CA2109138A1 (en) Device for encoding digital signals representing images, and corresponding decoding device
JPS56100572A (en) Signal processing system of variable density picture
DE3789426D1 (en) Digital circuitry to reduce quantization noise.
CA2232446A1 (en) Coding and decoding system for speech and musical sound
JPS55166338A (en) Pcm coding device
EP0416918A3 (en) Hybrid predictive coders and decoders for digital video signals
JPS5612144A (en) Dither
JPS5761387A (en) Encoder between frames
GB1142578A (en) Improvements in or relating to delta-modulation electrical communication systems
JPS5625827A (en) Coding unit
FR2160030A5 (en)
JPS54150013A (en) Digital signal transmission system
JPS5757085A (en) Adaptive system for difference encoding
JPS55166337A (en) Adaptive/predictive dpcm method and its device
JPS5434612A (en) Noise reducting device
JPS55115780A (en) Estimate coding system for television signal
ES486610A1 (en) Analogue to digital converters
JPS57101421A (en) Generating circuit for differential pulse code modulation signal
JPS5773526A (en) Decoder for differential pulse code modulation signal
JPS5643847A (en) Transmission system
JPS56106422A (en) Decoding system by method for converting digital signal into pulse width modulated signal
JPS6429132A (en) Echo canceller
JPS56140461A (en) Picture processing method
JPS579127A (en) Forecasting encoding device