EP0074656A2
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Method and apparatus for encoding a binary digital information signal
Assignee: Sony Corp
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Filing: 1982-09-13
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Granted: —
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Expires: 2002-09-13
Abstract
Abstract A system for encoding a binary digital information signal comprised of 8-bit information words occurring within a frequency band to produce an encoded binary digital information signal comprised of 17-bit channel words formed of 14-bit information words and 3-bit separation words and with the encoded signal satisfying the d- and k-constraint rules, reducing DC imbalance and having substantially reduced components thereof in a predetermined undesirable lower frequency range of the frequency band, the system converting each 8-bit information word into a 14-bit information word; generating a set of four possible 3-bit separation words for use with each 14-bit information word which satisfy the d and k-constraint rules; determining an integrating transfer function characteristic having a high gain with respect to the predetermined frequency range; obtaining a step response by modifying each 14-bit information word and each respective possible 3-bit separation word by the integrating transfer function characteristic; evaluating the step response for a predetermined number of 14-bit information words and respective possible 3-bit separation words, either separately for each word or at the end of each possible 17-bit channel word, to obtain values including information with respect to the predetermined frequency range; selecting the possible 3-bit separation word for each 14-bit information corresponding to a respective one of the values which is closest to zero; and adding each selected 3-bit separation word to each respective 14-bit information word to produce a plurality of 17-bit channel words which form the encoded binary digital information signal.
Inventors
- 👤 Hiroshi Ogawa
- 👤 Tamotsu Yamagami
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 20:55
CPC Classifications
H; H03; H03K; H03K9/00; G; G11; G11B; G11B20/00; G11B20/10; G11B20/14; G11B20/1403; G11B20/1423; G11B20/1426; G11B7/00; G11B7/007; G11B7/013; H04; H04L; H04L25/00; H04L25/38; H04L25/40; H04L25/49; H04L25/4906; H04L25/4908
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
258 words
A method of encoding a binary digital information signal comprised of m-bit information words occurring within a frequency band to produce an encoded binary digital information signal comprised of'n-bit channel words, each n-bit channel word being comprised of an n l -bit information word where n 1 > m and an n 2 -bit separation word, and said encoded binary digital information signal having a format with substantially reduced components thereof in a predetermined frequency range of said frequency band, said method comprising the steps of: converting each m-bit information word into an n l -bit information word; generating a set of possible n 2 -bit separation words for use with each n 1 -bit information word; determining an integrating transfer function characteristic including information with respect to said predetermined frequency range; evaluating a step response, obtained by modifying each said n l -bit information word and each respective possible n 2 -bit separation word by said integrating transfer function characteristic, at at least one predetermined evaluation time to obtain a parameter having an overall value including information with respect to said predetermined frequency range; selecting the one of said possible n 2 -bit separation words for each of said n l -bit information words in response to the value of said parameter; and adding said selected ones of said possible n 2 -bit separation words following each respective one of said n 1 -bit information words to form said encoded binary digital information signal having said format with substantially reduced components thereof in said predetermined frequency range.
Claim 2
Independent Claim
258 words
A method of encoding a binary digital information signal comprised of m-bit information words occurring within a frequency band to produce an encoded binary digital information signal comprised of'n-bit channel words, each n-bit channel word being comprised of an n l -bit information word where n 1 > m and an n 2 -bit separation word, and said encoded binary digital information signal having a format with substantially reduced components thereof in a predetermined frequency range of said frequency band, said method comprising the steps of: converting each m-bit information word into an n l -bit information word; generating a set of possible n 2 -bit separation words for use with each n 1 -bit information word; determining an integrating transfer function characteristic including information with respect to said predetermined frequency range; evaluating a step response, obtained by modifying each said n l -bit information word and each respective possible n 2 -bit separation word by said integrating transfer function characteristic, at at least one predetermined evaluation time to obtain a parameter having an overall value including information with respect to said predetermined frequency range; selecting the one of said possible n 2 -bit separation words for each of said n l -bit information words in response to the value of said parameter; and adding said selected ones of said possible n 2 -bit separation words following each respective one of said n 1 -bit information words to form said encoded binary digital information signal having said format with substantially reduced components thereof in said predetermined frequency range.
Claim 3
Dependent Claim
34 words
A method according to Claim 1; in which said step of determining includes the step of determining an integrating transfer function characteristic having a high gain for signals occurring within said predetermined frequency range.
Claim 4
Dependent Claim
91 words
A method according to Claim 1; in which said step of evaluating includes the step of evaluating said step response separately for each n l -bit information word and each n 2 -bit separation word to obtain said parameter separately for said n l -bit information words and said n 2 -bit separation words, each said separately obtained parameter having a respective separately obtained value including information with respect to said predetermined frequency range, and the step of combining respective ones of said separately obtained values to obtain said overall value.
Claim 5
Dependent Claim
47 words
A method according to Claim 1; in which said step of selecting includes the step of selecting the one n 2 -bit separation word for each of said n l -bit information words that corresponds to the overall value of said parameter which is closest to zero.
Claim 6
Dependent Claim
51 words
A method according to Claim 1; in which said step of evaluating includes the step of evaluating said step response at a plurality of evaluation times, with successive evaluation times being separated by the occurrence of a plurality of n l -bit information words and corresponding n 2 -bit separation words.
Claim 7
Dependent Claim
59 words
A method according to Claim 1; in which said step of evaluating includes the step of evaluating said step response at a plurality of evaluation times to obtain a plurality of values of said parameter including information with respect to said predetermined frequency range, and the step of obtaining said overall value in response to said plurality of values.
Claim 8
Independent Claim
283 words
A method of,encoding a binary digital information signal comprised of m-bit information words occurring within a frequency band to produce an encoded binary digital information signal comprised of n-bit channel words, each n-bit channel word being comprised of an n - bit information word where n 1 > m and an n 2 -bit separation word, and said encoded binary digital information signal having a format with substantially reduced components thereof in a predetermined frequency range of said frequency band, said method comprising the steps of: converting each m-bit information word into an n l -bit information word; generating a set of possible n 2 -bit separation words for use with each n l -bit information word; separately adding each possible n 2 -bit separation word to each n l -bit information word, to provide at least one n-bit channel word corresponding to each n 1 -bit information word; determining an integrating transfer function characteristic including information with respect to said predetermined frequency range; modifying each said n-bit channel word by said integrating transfer function characteristic to produce a step response; evaluating said step response at at least one predetermined evaluation time to obtain a parameter having an overall value including information with respect to said predetermined frequency range; selecting the one of said possible n 2 -bit separation words for each of said n-bit information words that yields a value of said parameter which is closest to zero; and adding said selected ones of said possible n 2 -bit separation words following each respective one of said n l -bit information words to form said encoded binary digital information signal having said format with substantially reduced components thereof-in said predetermined frequency range.
Claim 9
Independent Claim
283 words
A method of,encoding a binary digital information signal comprised of m-bit information words occurring within a frequency band to produce an encoded binary digital information signal comprised of n-bit channel words, each n-bit channel word being comprised of an n - bit information word where n 1 > m and an n 2 -bit separation word, and said encoded binary digital information signal having a format with substantially reduced components thereof in a predetermined frequency range of said frequency band, said method comprising the steps of: converting each m-bit information word into an n l -bit information word; generating a set of possible n 2 -bit separation words for use with each n l -bit information word; separately adding each possible n 2 -bit separation word to each n l -bit information word, to provide at least one n-bit channel word corresponding to each n 1 -bit information word; determining an integrating transfer function characteristic including information with respect to said predetermined frequency range; modifying each said n-bit channel word by said integrating transfer function characteristic to produce a step response; evaluating said step response at at least one predetermined evaluation time to obtain a parameter having an overall value including information with respect to said predetermined frequency range; selecting the one of said possible n 2 -bit separation words for each of said n-bit information words that yields a value of said parameter which is closest to zero; and adding said selected ones of said possible n 2 -bit separation words following each respective one of said n l -bit information words to form said encoded binary digital information signal having said format with substantially reduced components thereof-in said predetermined frequency range.
Claim 10
Dependent Claim
34 words
A method according to Claim 7; in which said step of determining includes the step of determining an integrating transfer function characteristic having a high gain for signals occurring within said predetermined frequency range.
Claim 11
Dependent Claim
25 words
A method according to Claim 7; in which said step of evaluating includes the step of evaluating said step response for each n-bit channel word.
Claim 12
Dependent Claim
37 words
A method according to Claim 7; in which said step of evaluating includes the step of evaluating said step response for a plurality of said n-bit channel words to obtain a plurality of values of said parameter.
Claim 13
Dependent Claim
41 words
A method according to claim 10; in which said step of evaluating includes the step of weighting said plurality of values to obtain a plurality of weighted values, and the step of combining said weighted values to obtain said overall value.
Claim 14
Independent Claim
354 words
A method of encoding a binary digital information signal comprised of m-bit information words occurring within a frequency band to produce an encoded binary digital information signal comprised of n-bit channel words, each n-bit channel word being comprised of an n 1 -bit information word where n 1 >m and an n-bit separation word, and such that, in a continuous stream of said channel words, a d-constraint rule is satisfied in which a minimum of d consecutive bits of one type exist between bits of the other type and a k-constraint rule is satisfied in which a maximum of k consecutive bits of said one type exist between said bits of the other type, and said encoded binary digital information signal is produced with substantially reduced components thereof in a predetermined frequency range of said frequency band, said method comprising the steps of: converting each m-bit information word into an n 1 -bit information word; generating a set of possible n 2 -bit separation words for use with each n l -bit information word so that said d-constraint rule and said k-constraint rule are satisfied; separately adding each possible n 2 -bit separation word to each n 1 -bit information word, to provide at least one n-bit channel word corresponding to each n l -bit information word; determining ah integratihng transter function characteristic including information with respect to said predetermined frequency range; modifying each said n-bit channel word by said integrating transfer function characteristic to produce a step repsonse; evaluating said step response at at least one predetermined evaluation time to obtain a parameter having an overall value including information with respect to said predetermined frequency range; selecting the one of said possible n 2 -bit separation words for each of said n l -bit information words that yields a value of said parameter which is closest to zero; and adding said selected ones of said possible n 2 -bit separation words following each respective one of said n 1 -bit information words to form said encoded binary digital information signal having said format with substantially reduced components thereof in said predetermined frequency range.
Claim 15
Independent Claim
354 words
A method of encoding a binary digital information signal comprised of m-bit information words occurring within a frequency band to produce an encoded binary digital information signal comprised of n-bit channel words, each n-bit channel word being comprised of an n 1 -bit information word where n 1 >m and an n-bit separation word, and such that, in a continuous stream of said channel words, a d-constraint rule is satisfied in which a minimum of d consecutive bits of one type exist between bits of the other type and a k-constraint rule is satisfied in which a maximum of k consecutive bits of said one type exist between said bits of the other type, and said encoded binary digital information signal is produced with substantially reduced components thereof in a predetermined frequency range of said frequency band, said method comprising the steps of: converting each m-bit information word into an n 1 -bit information word; generating a set of possible n 2 -bit separation words for use with each n l -bit information word so that said d-constraint rule and said k-constraint rule are satisfied; separately adding each possible n 2 -bit separation word to each n 1 -bit information word, to provide at least one n-bit channel word corresponding to each n l -bit information word; determining ah integratihng transter function characteristic including information with respect to said predetermined frequency range; modifying each said n-bit channel word by said integrating transfer function characteristic to produce a step repsonse; evaluating said step response at at least one predetermined evaluation time to obtain a parameter having an overall value including information with respect to said predetermined frequency range; selecting the one of said possible n 2 -bit separation words for each of said n l -bit information words that yields a value of said parameter which is closest to zero; and adding said selected ones of said possible n 2 -bit separation words following each respective one of said n 1 -bit information words to form said encoded binary digital information signal having said format with substantially reduced components thereof in said predetermined frequency range.
Claim 16
Dependent Claim
236 words
13 - Apparatus for encoding a binary digital information signal comprised of m-bit information words occurring within a frequency band to produce an encoded binary digital information signal comprised of n-bit channel words, each n-bit channel word being comprised of an nl-bit information word where n 1 >m and an n 2 -bit separation word, and said encoded binary digital information signal having a format with substantially reduced components thereof in a predetermined frequency range of said frequency band, said apparatus comprising: means for converting each m-bit information word into an n 1 -bit information word; means for generating a set of possible n 2 -bit separation words for use with each n l -bit information word; means for generating an evaluation signal corresponding to at least one parameter of a step response produced by modifying each n 2 -bit information word and each respective possible n2-bit separation word by an integrating transfer function characteristic including information with respect to said predetermined frequency range; means for selecting one of said possible n 2 -bit separation words for each respective n-bit information word in response to said evaluation signal; and means for adding each said selected one of said possible n 2 -bit separation words following each respective one of said n 1 -bit information words to form said encoded binary digital information signal having said format with substantially reduced components thereof in said predetermined frequency range.
Claim 17
Dependent Claim
236 words
13 - Apparatus for encoding a binary digital information signal comprised of m-bit information words occurring within a frequency band to produce an encoded binary digital information signal comprised of n-bit channel words, each n-bit channel word being comprised of an nl-bit information word where n 1 >m and an n 2 -bit separation word, and said encoded binary digital information signal having a format with substantially reduced components thereof in a predetermined frequency range of said frequency band, said apparatus comprising: means for converting each m-bit information word into an n 1 -bit information word; means for generating a set of possible n 2 -bit separation words for use with each n l -bit information word; means for generating an evaluation signal corresponding to at least one parameter of a step response produced by modifying each n 2 -bit information word and each respective possible n2-bit separation word by an integrating transfer function characteristic including information with respect to said predetermined frequency range; means for selecting one of said possible n 2 -bit separation words for each respective n-bit information word in response to said evaluation signal; and means for adding each said selected one of said possible n 2 -bit separation words following each respective one of said n 1 -bit information words to form said encoded binary digital information signal having said format with substantially reduced components thereof in said predetermined frequency range.
Claim 18
Dependent Claim
59 words
Apparatus according to Claim 13; in which said means for converting includes first memory means for producing an n l -bit information word in response to each m-bit information word, and said means for generating includes second memory means for producing said set of possible n 2 -bit separation words for use with each n l -bit information word.
Claim 19
Dependent Claim
109 words
Apparatus according to Claim 14; in which said means for generating includes third memory means for generating a first signal corresponding to said at least one parameter of a step response produced by modifying each n l -bit information word by said integrating transfer function characteristic, fourth memory means for generating a second signal corresponding to said at least one parameter of a step response produced by modifying each n 2 -bit separation word by said integrating transfer function characteristic, and means for generating said evaluation signal in response to said first and second signals corresponding to associated n l -bit information words and n 2 -bit separation words.
Claim 20
Dependent Claim
20 words
Apparatus according to Claim 15; in which said first, second, third and fourth memory means each include a read-only memory.
Claim 21
Dependent Claim
60 words
Apparatus according to Claim 14; in which said means for selecting includes selector means supplied with said possible n 2 -bit separation words from said second memory means and optimum redundant word determination means for controlling said selector means to gate the selected n 2 -bit separation word for each respective n-bit information word in response to said evaluation signal.
Claim 22
Dependent Claim
54 words
Apparatus according to Claim 17; in which said means for adding includes register means supplied with each selected n 2 -bit separation word from said selector means and each respective n l -bit information word from said first memory means to produce said n-bit channel words which form said encoded binary digital information signal.
Claim 23
Independent Claim
158 words
A method of decoding an encoded binary digital information signal comprised of n-bit channel words, during reproduction, each n-bit channel word being comprised of an n 1 -bit information word and a n 2 -bit separation word, the encoded binary digital information signal having a synchronizing signal added thereto and having a formate with substantially reduced components thereof in a predetermined frequency range, to form an original binary digital information frequency range, and to form an original binary digital information signal comprised of m-bit information words where n 1 >m, said method comprising the steps of - detecting said synchronizing signal, - extracting said encoded binary digital information signal in response to said detection of said synchronizing signal, - separating said n 1 -bit information words from said extracted encoded binary digital information signal, and - converting each separated n 1 -bit information word to a corresponding m-bit information word to form said original binary digital information signal.
Claim 24
Independent Claim
158 words
A method of decoding an encoded binary digital information signal comprised of n-bit channel words, during reproduction, each n-bit channel word being comprised of an n 1 -bit information word and a n 2 -bit separation word, the encoded binary digital information signal having a synchronizing signal added thereto and having a formate with substantially reduced components thereof in a predetermined frequency range, to form an original binary digital information frequency range, and to form an original binary digital information signal comprised of m-bit information words where n 1 >m, said method comprising the steps of - detecting said synchronizing signal, - extracting said encoded binary digital information signal in response to said detection of said synchronizing signal, - separating said n 1 -bit information words from said extracted encoded binary digital information signal, and - converting each separated n 1 -bit information word to a corresponding m-bit information word to form said original binary digital information signal.
Claim 25
Dependent Claim
152 words
Apparatus for decoding an encoded binary digital information signal comprised of n-bit channel words, during reproduction, each n-bit channel word being comprised of an n 1 -bit information word and an n 2 -bit separation word, the encoded binary digital information signal having s synchronizing signal added thereto and having a formate with substantially reduced components there in a predetermined frequency range, to form an original binary digital information signal comprised of m-bit information words, where n 1 >m, said apparatus comprising: - means for detecting said synchronizing signal, - means for extracting said encoded binary digital information signal in response to said detection of said synchronizing signal, - means for separating said n 1 -bit information words from said extracted encoded binary digital information signal, and - means for converting each separated n 1 -bit information word to a corresponding m-bit information word to form said original binary digital information signal.
Claim 26
Dependent Claim
152 words
Apparatus for decoding an encoded binary digital information signal comprised of n-bit channel words, during reproduction, each n-bit channel word being comprised of an n 1 -bit information word and an n 2 -bit separation word, the encoded binary digital information signal having s synchronizing signal added thereto and having a formate with substantially reduced components there in a predetermined frequency range, to form an original binary digital information signal comprised of m-bit information words, where n 1 >m, said apparatus comprising: - means for detecting said synchronizing signal, - means for extracting said encoded binary digital information signal in response to said detection of said synchronizing signal, - means for separating said n 1 -bit information words from said extracted encoded binary digital information signal, and - means for converting each separated n 1 -bit information word to a corresponding m-bit information word to form said original binary digital information signal.
Claim 27
Dependent Claim
25 words
A recording medium having an information structure recorded thereon comprising encoded binary digital information signals as mentioned in at least one of the preceding claims.
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