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EP0193153A2
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Digital data recording and reproducing method
Assignee: Panasonic Holdings Corp
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Filing: 1986-02-24
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Granted: —
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Expires: 2006-02-24
Abstract
Abstract In a digital data recording and reproducing method, a digital data sequence is divided into every 8-bit digital data, when the divided 8-bit digital data is encoded to 14-bit code, an 8-bit digital data wherein value of DSV is limited in a predetermined range is selected from two codes corresponding to 8-bit digital data, and in an encoding process, the number of bit "0" which is inserted between two bits "1" in the code sequence is restricted to a number of from one to eight, and hence, DC component in the code sequence is eliminated.
Inventors
- 👤 Kousou Takeuchi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 22:14
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/14; G11B20/1403; G11B20/1423; G11B20/1426; G11B20/12; G11B27/00; G11B27/10; G11B27/19; G11B27/28; G11B27/30; G11B27/3027
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
84 words
Digital data recording and reproducing method comprising: dividing digital data to every 8-bit digital data, selecting one of two codes wherein an absolute value of digital sum variation of NRZI coded wave form wherein a code sequence of said digital data is encoded to NRZI code decreases, wherein number of bit "0" inserted between two bits "1" in a code sequence is restricted to a number from one to eight and below, when said 8-bit digital data is allotted to one or two codes.
Claim 2
Dependent Claim
84 words
Digital data recording and reproducing method comprising: dividing digital data to every 8-bit digital data, selecting one of two codes wherein an absolute value of digital sum variation of NRZI coded wave form wherein a code sequence of said digital data is encoded to NRZI code decreases, wherein number of bit "0" inserted between two bits "1" in a code sequence is restricted to a number from one to eight and below, when said 8-bit digital data is allotted to one or two codes.
Claim 3
Dependent Claim
83 words
Digital data recording and reproducing method in accordance with claim 1, wherein codeword digital sum of respective codes are caluculated, and a code wherein said codeword digital sum is zero is made to correspond to an 8-bit digital data and a pair of a code wherein codeword digital sum is not zero and another code wherein polarity of codeword digital sum and an absolute value of codeword digital sum are different from said code is made to correspond to said 8-bit digital data.
Claim 4
Dependent Claim
70 words
Digital data recording and reproducing apparatus comprising: means for producing NRZI coding of a code sequence wherein an 8-bit digital data is sequentially coded, means for issuing a control signal which selects 14-bit code wherein an absolute value of digital sum variation of a wave form of said NRZI code decreases, and means for issuing a 14-bit code corresponding to said 8-bit digital data by input of said control signal.
Claim 5
Dependent Claim
70 words
Digital data recording and reproducing apparatus comprising: means for producing NRZI coding of a code sequence wherein an 8-bit digital data is sequentially coded, means for issuing a control signal which selects 14-bit code wherein an absolute value of digital sum variation of a wave form of said NRZI code decreases, and means for issuing a 14-bit code corresponding to said 8-bit digital data by input of said control signal.
Claim 6
Dependent Claim
121 words
Digital data recording and reproducing apparatus in accordance with claim 3, wherein means to generate said control signal comprises: means for calculating a variation of digital sum variation which is changed by said 14-bit code, means for adding said variation of digital sum variation and a value of digital sum variation before said variation arise, means for memorizing the value of digital sum variation which is calculated by addition process, means for discriminating a value of digital sum variation, means for realizing a polarity at an end point of said 14-bit code, means for memorizing said polarity, and means for deciding issue either of a code wherein CDS is positive or zero or a code wherein CDS is negative or zero.
Claim 7
Dependent Claim
36 words
Digital data recording and reproducing method in accordance with claim 2, wherein a bit sequence which never arise in a code sequence wherein a digital data sequence is encoded is used as a frame synchronizing signal.
Claim 8
Dependent Claim
51 words
Digital data recording and reproducing method in accordance with claim 5, wherein an N-bit sequence (N216) including a pattern "1000000010000000" which does not coincide to an optional continuous 16-bit code which is extracted from a code sequence wherein a digital data sequence is encoded is recorded as a frame synchronizing signal.
References Cited (Backward Citations)
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