JPS55150111A - Coding method - Google Patents

Coding method

Info

Publication number
JPS55150111A
JPS55150111A JP5775079A JP5775079A JPS55150111A JP S55150111 A JPS55150111 A JP S55150111A JP 5775079 A JP5775079 A JP 5775079A JP 5775079 A JP5775079 A JP 5775079A JP S55150111 A JPS55150111 A JP S55150111A
Authority
JP
Japan
Prior art keywords
mfm
data
coded
component
coding
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
JP5775079A
Other languages
Japanese (ja)
Inventor
Shigeyuki Kawarabayashi
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP5775079A priority Critical patent/JPS55150111A/en
Publication of JPS55150111A publication Critical patent/JPS55150111A/en
Pending legal-status Critical Current

Links

Landscapes

  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Dc Digital Transmission (AREA)

Abstract

PURPOSE: To remove the DC component of the integral product of an MFM signal by performing the Modified Frequency Modulation(MFM) coding of data corresponding to preceding data.
CONSTITUTION: Through a group of gates, etc., opening and closing corresponding to the recording of preceding data, etc., initial data 0 of data sequence 011W10 is MFM-coded corresponding to the coding output of data 1 right after it and final 0 is MFM-coded into the inverted value of the MFM coding output of initial 0. Data 1 is MFM-coded into the inverted value of the MFM coding output of one past data 1. An MFM-coded signal like this contains no DC component by integration and removing the DC component eliminates the need for a DC amplifier, etc., so that low-frequency signals such as servo signals in magnetic recording, etc., will easily be extracted with precision.
COPYRIGHT: (C)1980,JPO&Japio
JP5775079A 1979-05-09 1979-05-09 Coding method Pending JPS55150111A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5775079A JPS55150111A (en) 1979-05-09 1979-05-09 Coding method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5775079A JPS55150111A (en) 1979-05-09 1979-05-09 Coding method

Publications (1)

Publication Number Publication Date
JPS55150111A true JPS55150111A (en) 1980-11-21

Family

ID=13064562

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5775079A Pending JPS55150111A (en) 1979-05-09 1979-05-09 Coding method

Country Status (1)

Country Link
JP (1) JPS55150111A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4414659A (en) * 1980-06-16 1983-11-08 U.S. Philips Corporation Method and apparatus for encoding digital data so as to reduce the D.C. and low frequency content of the signal

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4414659A (en) * 1980-06-16 1983-11-08 U.S. Philips Corporation Method and apparatus for encoding digital data so as to reduce the D.C. and low frequency content of the signal

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