JPS6320054B2 - - Google Patents

Info

Publication number
JPS6320054B2
JPS6320054B2 JP58197717A JP19771783A JPS6320054B2 JP S6320054 B2 JPS6320054 B2 JP S6320054B2 JP 58197717 A JP58197717 A JP 58197717A JP 19771783 A JP19771783 A JP 19771783A JP S6320054 B2 JPS6320054 B2 JP S6320054B2
Authority
JP
Japan
Prior art keywords
dpcm
quantization error
value
signal
subtractors
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.)
Expired
Application number
JP58197717A
Other languages
Japanese (ja)
Other versions
JPS5995726A (en
Inventor
Shutaruku Arekusandaa
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of JPS5995726A publication Critical patent/JPS5995726A/en
Publication of JPS6320054B2 publication Critical patent/JPS6320054B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
    • H03M7/30—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
    • H03M7/3002—Conversion to or from differential modulation
    • H03M7/3044—Conversion to or from differential modulation with several bits only, i.e. the difference between successive samples being coded by more than one bit, e.g. differential pulse code modulation [DPCM]

Landscapes

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

Claims (1)

【特許請求の範囲】 １ 量子化回路と、整数の遅延指標ｋ，ｌ，ｍ，
ｎ……によつて特徴付けられた、先行するPCM
信号値から予測係数Ａ，Ｂ，Ｃ，……を用いて計
算される見積値s^iの使用によつてDPCM信号値
Δsiを求めるための算術計算素子とを備えた、入
力側にPCM信号値siが加わる高速DPCM符号器
において、 DPCM符号器として２つの直列接続された計
算ユニツトＣ１０，Ｃ２０が設けられており、か
つ第１計算ユニツトＣ１０は少なくとも１つの乗
算器５と、少なくとも１つの減算器１とを有する
トランスバーサルフイルタを含んでおり、前記減
算器は、出力信号として第１中間値 Zi,1＝si−Asi-k−Bsi-l−Csi-n −Dsi-o−…… （ｋ＜ｌ＜ｍ＜ｎ） を送出し、かつ前記第２計算ユニツトＣ２０は、
出力信号としてDPCM信号値Δsiの量子化誤差qi
を送出する量子化回路７２を備えており、かつ所
属の予測係数と乗算される量子化誤差Aqi-k，
Bqi-l，Cqi-n，Dqi-o，……を求めるための算術計
算素子５５ないし５７が設けられており、かつ上
記のように評価された量子化誤差が、前記第１中
間値Zi [Claims] 1. Quantization circuit and integer delay indices k, l, m,
The preceding PCM characterized by n...
A PCM on the input side, comprising an arithmetic calculation element for determining the DPCM signal value Δs i by using the estimated value s^ i calculated from the signal value using the prediction coefficients A, B, C, ... In a fast DPCM encoder in which signal values s i are applied, two series-connected calculation units C10, C20 are provided as a DPCM encoder, and the first calculation unit C10 has at least one multiplier 5 and at least one a transversal filter with two subtractors 1, said subtractors having as output signals first intermediate values Z i,1 =s i −As ik −Bs il −Cs in −Ds io −…… ( k<l<m<n), and the second calculation unit C20
Quantization error q i of DPCM signal value Δs i as output signal
, and the quantization error Aq ik , which is multiplied by the associated prediction coefficient.
Arithmetic calculation elements 55 to 57 are provided for determining Bq il , Cq in , Dq io , . . . , and the quantization error evaluated as described above is calculated as the first intermediate value Z i
JP19771783A 1982-10-27 1983-10-24 High speed dpcm encoder Granted JPS5995726A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19823239841 DE3239841A1 (en) 1982-10-27 1982-10-27 Fast DPCM encoder
DE3239841.7 1982-10-27

Publications (2)

Publication Number Publication Date
JPS5995726A JPS5995726A (en) 1984-06-01
JPS6320054B2 true JPS6320054B2 (en) 1988-04-26

Family

ID=6176750

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19771783A Granted JPS5995726A (en) 1982-10-27 1983-10-24 High speed dpcm encoder

Country Status (2)

Country Link
JP (1) JPS5995726A (en)
DE (1) DE3239841A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3417139A1 (en) * 1984-05-09 1985-11-14 Standard Elektrik Lorenz Ag, 7000 Stuttgart Digital DPCM coder/decoder for high processing speeds, particularly for television picture signals
US4658239A (en) * 1984-09-14 1987-04-14 Siemens Aktiengesellschaft Differential pulse code modulation coder
JPS6188620A (en) * 1984-10-05 1986-05-06 Nippon Telegr & Teleph Corp <Ntt> Predictive coding circuit
DE3634691A1 (en) * 1986-10-11 1988-04-14 Philips Patentverwaltung DIFFERENTIAL PULSE CODE MODULATOR AND THEIR USE AS A DEMODULATOR

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5448471A (en) * 1977-09-26 1979-04-17 Nippon Telegr & Teleph Corp <Ntt> Coding system
JPS55166338A (en) * 1979-06-12 1980-12-25 Nec Corp Pcm coding device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53119656A (en) * 1977-03-29 1978-10-19 Nippon Telegr & Teleph Corp <Ntt> Forecast coding equipment
JPS55100743A (en) * 1979-01-26 1980-07-31 Toshiba Corp Forecasting coder
JPS57101421A (en) * 1980-12-17 1982-06-24 Fujitsu Ltd Generating circuit for differential pulse code modulation signal

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5448471A (en) * 1977-09-26 1979-04-17 Nippon Telegr & Teleph Corp <Ntt> Coding system
JPS55166338A (en) * 1979-06-12 1980-12-25 Nec Corp Pcm coding device

Also Published As

Publication number Publication date
DE3239841A1 (en) 1984-05-03
JPS5995726A (en) 1984-06-01

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