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JPS57143635A - Method and device for converting digital signal - Google Patents

Method and device for converting digital signal

Info

Publication number
JPS57143635A
JPS57143635A JP3009381A JP3009381A JPS57143635A JP S57143635 A JPS57143635 A JP S57143635A JP 3009381 A JP3009381 A JP 3009381A JP 3009381 A JP3009381 A JP 3009381A JP S57143635 A JPS57143635 A JP S57143635A
Authority
JP
Japan
Prior art keywords
data
8bit
code
converting
general purpose
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
JP3009381A
Other languages
Japanese (ja)
Inventor
Shuichi Fukuda
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.)
Fujitsu General Ltd
Aerojet Rocketdyne Holdings Inc
Original Assignee
Fujitsu General Ltd
Gencorp Inc
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 Fujitsu General Ltd, Gencorp Inc filed Critical Fujitsu General Ltd
Priority to JP3009381A priority Critical patent/JPS57143635A/en
Publication of JPS57143635A publication Critical patent/JPS57143635A/en
Pending 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)

Abstract

PURPOSE:To reduce the number of used general purpose ROMs, by converting many codes partially to an intermediate word and converting them to an intermediate code on a basis of this intermediate word and rest codes and converting original codes to data on a basis of this intermediate code. CONSTITUTION:In case that a general purpose 16K (2kX8 bits) ROM is used in the EFM (14-8 conversion) modulation system for a digital signal, 14bit input data is divided into 11bit data and 3bit data because the address input of the general purpose ROM is only 11bits, and 11bit data is inputted to the address input of an ROM2, and the output is converted to a corresponding 8bit intermediate code. This 8bit code and rest 3bit data are combined to input 11 bits to the address input of the ROM3, and finally, 8bit data is taken out. Thus, the 14bit code is converted to 8bit data with a small number of used ROMs.
JP3009381A 1981-03-03 1981-03-03 Method and device for converting digital signal Pending JPS57143635A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3009381A JPS57143635A (en) 1981-03-03 1981-03-03 Method and device for converting digital signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3009381A JPS57143635A (en) 1981-03-03 1981-03-03 Method and device for converting digital signal

Publications (1)

Publication Number Publication Date
JPS57143635A true JPS57143635A (en) 1982-09-04

Family

ID=12294160

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3009381A Pending JPS57143635A (en) 1981-03-03 1981-03-03 Method and device for converting digital signal

Country Status (1)

Country Link
JP (1) JPS57143635A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6041847A (en) * 1983-08-18 1985-03-05 Matsushita Electric Ind Co Ltd Efm demodulating method
JPS61170140A (en) * 1985-01-24 1986-07-31 Matsushita Electric Ind Co Ltd Code converter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6041847A (en) * 1983-08-18 1985-03-05 Matsushita Electric Ind Co Ltd Efm demodulating method
JPS61170140A (en) * 1985-01-24 1986-07-31 Matsushita Electric Ind Co Ltd Code converter

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