JPS5735434A - Adpcm reproducer - Google Patents

Adpcm reproducer

Info

Publication number
JPS5735434A
JPS5735434A JP10980080A JP10980080A JPS5735434A JP S5735434 A JPS5735434 A JP S5735434A JP 10980080 A JP10980080 A JP 10980080A JP 10980080 A JP10980080 A JP 10980080A JP S5735434 A JPS5735434 A JP S5735434A
Authority
JP
Japan
Prior art keywords
code
memory
adpcm
digit
quantized
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
JP10980080A
Other languages
Japanese (ja)
Other versions
JPS6124850B2 (en
Inventor
Makoto Morito
Tsutomu Kaneko
Takashi Yato
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.)
Oki Electric Industry Co Ltd
Original Assignee
Oki Electric Industry 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 Oki Electric Industry Co Ltd filed Critical Oki Electric Industry Co Ltd
Priority to JP10980080A priority Critical patent/JPS5735434A/en
Publication of JPS5735434A publication Critical patent/JPS5735434A/en
Publication of JPS6124850B2 publication Critical patent/JPS6124850B2/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]
    • H03M7/3046—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] adaptive, 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)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)

Abstract

PURPOSE:To convert an ADPCM code of voice into a normal PCM code with a simple circuit constitution, by changing a quantized width required for the quantized value of a differential signal according to the ADPCM code. CONSTITUTION:An amount corresponding to a plurality of predetermined quantized step sizes is stored in the 1st memory 62. A pointer 60 which designates the address of the 1st memory 62 and outputs one of amounts corresponding to the quantized step size from the 1st memory 62 is provided, the pointer moving amount is stored and the pointer output is moved according to an ADPCM code in the 2nd memory 59. The 1st register 63 which inputs the output of the 1st memory 62 and outputs the reference value corresponding to each digit of the amplitude bit at the ADPCM code, and the 2nd register which can store the reporduced PCM code are provided, and the sum or difference between the PCM code immediately before and the reference amount corresponding to each digit according to each digit amoung the polarity bit of the present ADPCM and the amplitude bit is taken, allowing to obtain the present PCM code.
JP10980080A 1980-08-12 1980-08-12 Adpcm reproducer Granted JPS5735434A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10980080A JPS5735434A (en) 1980-08-12 1980-08-12 Adpcm reproducer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10980080A JPS5735434A (en) 1980-08-12 1980-08-12 Adpcm reproducer

Publications (2)

Publication Number Publication Date
JPS5735434A true JPS5735434A (en) 1982-02-26
JPS6124850B2 JPS6124850B2 (en) 1986-06-12

Family

ID=14519531

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10980080A Granted JPS5735434A (en) 1980-08-12 1980-08-12 Adpcm reproducer

Country Status (1)

Country Link
JP (1) JPS5735434A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61206957A (en) * 1985-03-08 1986-09-13 Tokyo Electric Co Ltd Magnetic disk driving device

Also Published As

Publication number Publication date
JPS6124850B2 (en) 1986-06-12

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