Method and apparatus for encoding a binary digital information signal

Claim 1

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 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 1 -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 1 -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 1 -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

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 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 1 -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 1 -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 1 -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 8

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 1 -bit information word; generating a set of possible n 2 -bit separation words for use with each n 1 -bit information word; 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 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 1 -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 9

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 1 -bit information word; generating a set of possible n 2 -bit separation words for use with each n 1 -bit information word; 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 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 1 -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 14

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 2 -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 1 -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 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 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 1 -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

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 2 -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 1 -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 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 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 1 -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 23

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 an n 2 -bit separation word, the encoded binary digital information signal having a synchronizing signal added thereto and having a format with substantially reduced components thereof in a predetermined frequency range, 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 each of said n 1 -bit information words from each of said n-bit channel words comprising 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

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 an n 2 -bit separation word, the encoded binary digital information signal having a synchronizing signal added thereto and having a format with substantially reduced components thereof in a predetermined frequency range, 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 each of said n 1 -bit information words from each of said n-bit channel words comprising 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.