JPS54159807A - Block companding coding and decoding unit - Google Patents

Block companding coding and decoding unit

Info

Publication number
JPS54159807A
JPS54159807A JP6914678A JP6914678A JPS54159807A JP S54159807 A JPS54159807 A JP S54159807A JP 6914678 A JP6914678 A JP 6914678A JP 6914678 A JP6914678 A JP 6914678A JP S54159807 A JPS54159807 A JP S54159807A
Authority
JP
Japan
Prior art keywords
signals
input
block
decoding unit
normalizing
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
JP6914678A
Other languages
Japanese (ja)
Other versions
JPS6145422B2 (en
Inventor
Kazuo Ochiai
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 JP6914678A priority Critical patent/JPS54159807A/en
Publication of JPS54159807A publication Critical patent/JPS54159807A/en
Publication of JPS6145422B2 publication Critical patent/JPS6145422B2/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
    • H03M7/3053—Block-companding PCM systems

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 improves S/N by coding again input non-linear digital signals by uniform quantization after normalizing them in the block companding coding unit for a PCM telephone exchange system, etc. CONSTITUTION:Coding unit 20A consists of input terminals 11 to 16 where signals coded to non-linear digital signals are given, shift register 2 which delays input signals by one block, maximum value detection circuit 3 which detects a sample having the maximum amplitude, normalizing circuit 4 which an adder is main components, encoder 5 which codes again normalized signals by uniform quantization, and multiplexer 6 which transmito signal to a transmission line, and then, decoding unit 20B consists of multiplexer 8 which separates input signals from input terminal 7, register 9 for address, decoder 10 and reverse normalizing circuit 11.
JP6914678A 1978-06-07 1978-06-07 Block companding coding and decoding unit Granted JPS54159807A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6914678A JPS54159807A (en) 1978-06-07 1978-06-07 Block companding coding and decoding unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6914678A JPS54159807A (en) 1978-06-07 1978-06-07 Block companding coding and decoding unit

Publications (2)

Publication Number Publication Date
JPS54159807A true JPS54159807A (en) 1979-12-18
JPS6145422B2 JPS6145422B2 (en) 1986-10-08

Family

ID=13394218

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6914678A Granted JPS54159807A (en) 1978-06-07 1978-06-07 Block companding coding and decoding unit

Country Status (1)

Country Link
JP (1) JPS54159807A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09167970A (en) * 1995-08-09 1997-06-24 Korea Telecommun Inverse-normalization device of multichannel audio decoder, and inverse-normalization method used therefor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09167970A (en) * 1995-08-09 1997-06-24 Korea Telecommun Inverse-normalization device of multichannel audio decoder, and inverse-normalization method used therefor

Also Published As

Publication number Publication date
JPS6145422B2 (en) 1986-10-08

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