JPS6461122A - Coding system for digital information - Google Patents

Coding system for digital information

Info

Publication number
JPS6461122A
JPS6461122A JP21639687A JP21639687A JPS6461122A JP S6461122 A JPS6461122 A JP S6461122A JP 21639687 A JP21639687 A JP 21639687A JP 21639687 A JP21639687 A JP 21639687A JP S6461122 A JPS6461122 A JP S6461122A
Authority
JP
Japan
Prior art keywords
value
bit
minimum
unit
gradient
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
JP21639687A
Other languages
Japanese (ja)
Inventor
Tadahiko Kameyama
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP21639687A priority Critical patent/JPS6461122A/en
Priority to US07/226,321 priority patent/US4914438A/en
Priority to DE3825960A priority patent/DE3825960A1/en
Publication of JPS6461122A publication Critical patent/JPS6461122A/en
Pending legal-status Critical Current

Links

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

Abstract

PURPOSE:To set a gradient of magnetization inversion interval with respect to a discrimination timing window width optionally by adopting only a value as a run length such that it is a value between a minimum value (d) being an optional integer and a maximum, value (k) being other integer and a result of addition of an integral number of multiple of a positive integer being two or over and being an increment from a minimum value (d) and unable to divide (d+1). CONSTITUTION:A 4-bit or 5-bit unit of an original digital information string not limited is converted into 14-bit or 17-bit of a run length limit code, and d=4, k=16, s=2 are used in this case. The run length of '0' is used for an increment only in the unit of an optional positive integer (s>=2) unable to divide the value (d) till its maximum value (k) started from the minimum value (d). Thus, in converting m-bit unit of the original signal into n-bit, the minimum magnetization inversion interval R represented in the unit of the interval of 1-bit of the original data is m/n(d+1), the ratio (gradient) between the minimum magnetization inversion interval R and the data discrimination window width W is expressed as (d+1)/s thereby obtaining an optional gradient by varying the value (s) with respect to the value (d).
JP21639687A 1987-09-01 1987-09-01 Coding system for digital information Pending JPS6461122A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP21639687A JPS6461122A (en) 1987-09-01 1987-09-01 Coding system for digital information
US07/226,321 US4914438A (en) 1987-09-01 1988-07-29 Digital information coding system
DE3825960A DE3825960A1 (en) 1987-09-01 1988-07-29 METHOD AND DEVICE FOR DIGITAL INFORMATION CODING

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21639687A JPS6461122A (en) 1987-09-01 1987-09-01 Coding system for digital information

Publications (1)

Publication Number Publication Date
JPS6461122A true JPS6461122A (en) 1989-03-08

Family

ID=16687905

Family Applications (1)

Application Number Title Priority Date Filing Date
JP21639687A Pending JPS6461122A (en) 1987-09-01 1987-09-01 Coding system for digital information

Country Status (1)

Country Link
JP (1) JPS6461122A (en)

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