Patent EP0275585A1 successfully refreshed from Google Patents.
EP0275585A1
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Method of transmitting n-bit information words, information transmission system for carrying out the method, and encoding device and decoding device for use in the information-transmission system
Assignee: Optical Storage International Holland
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Filing: 1987-12-09
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Granted: —
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Expires: 2007-12-09
Abstract
Abstract An information-transmission system (1) comprises an encoding circuit (3) for converting the information words to be transmitted (D7, ..., D0) into a code word to be transmitted (C10, ... C0) and a decoding circuit (8) which reconverts the transmitted code words (Cʹ10, ..., C0) into information words (D*7, ...,D*0). For a first group of information words bear the encoding circuit (3) converts a first portion (D7, ..., D3) of the information word into a portion of the code word comprising a first group of q code bits (C10, ...,C5). For this first group a second portion (D2,... D0) is converted into a portion of the code word comprising a first group of s code bits (C4, ..., C0). For a second group of information words the encoding circuit (3) converts the first portion(D7, ...,D3) into a second group of q code bits (C5, ..., C0), whilst the second portion (D2, ... D0) is not converted into a second group of s code bits (C10, ..., C6). The decoding circuit 8 converts the m-bit code words corresponding to information words of the first group by converting the portion comprising the first group of q code bits (Cʹ10 ..., Cʹ5) into the first portion (D*7, ... D*3) of the information word to be reconverted and by converting the portion comprising the first group of s code bits (Cʹ4 ..., Cʹ0) into the second portion of the information word to be reconverted (D*2, ..., D*0). The decoding circuit converts the m-bit code words corresponding to the second group of information words by converting the portion comprising the second group of q code bits (Cʹ5, ..., Cʹ0) into the first portion (D*7,....D*3) of the information word and by converting the portion comprising the second group of s code bits (Cʹ10, ...,Cʹ6) into the second portion of the information word (D*2,..., D*0).
Inventors
- 👤 Johannes Jacobus Verboom
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-10 01:16
CPC Classifications
H; H03; H03M; H03M5/00; H03M5/02; H03M5/04; H03M5/14; H03M5/145
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
192 words
A method of transmitting n-bit information words, comprising an encoding step in which n-bit information words are converted into m-bit code words, m being greater than n, a transmission step for transmitting the m-bit code words, and a decoding step in which the transmitted m-bit code words are reconverted into n-bit information words, characterized in that for each n-bit information word of a first group of n-bit information words to be transmitted a predetermined first portion comprising p information bits is converted into a portion of the m-bit code word comprising a first predetermined group of q code bits and a predetermined second portion of the n-bit information word comprising r information bits is converted into a portion of the code word comprising a predetermined group of s code bits, whilst for each n-bit information word of a second group of n-bit information words to be transmitted the first portion is converted into a portion of the m-bit code word comprising a second predetermined group of q code bits and the second portion is converted into a portion of the m-bit code word comprising a second predetermined group of s code bits.
Claim 2
Independent Claim
192 words
A method of transmitting n-bit information words, comprising an encoding step in which n-bit information words are converted into m-bit code words, m being greater than n, a transmission step for transmitting the m-bit code words, and a decoding step in which the transmitted m-bit code words are reconverted into n-bit information words, characterized in that for each n-bit information word of a first group of n-bit information words to be transmitted a predetermined first portion comprising p information bits is converted into a portion of the m-bit code word comprising a first predetermined group of q code bits and a predetermined second portion of the n-bit information word comprising r information bits is converted into a portion of the code word comprising a predetermined group of s code bits, whilst for each n-bit information word of a second group of n-bit information words to be transmitted the first portion is converted into a portion of the m-bit code word comprising a second predetermined group of q code bits and the second portion is converted into a portion of the m-bit code word comprising a second predetermined group of s code bits.
Claim 3
Dependent Claim
151 words
A method as claimed in Claim 1, characterized in that for each transmitted m-bit code word of a first group of m-bit code words representing the first group of n-bit information words the portion comprising the first group of q code bits is converted into the first portion of the n-bit information word to be reconverted and the portion comprising the first group of s code bits is converted into the second portion of the information word to be reconverted, whilst for each transmitted m-bit code word of a second group of m-bit code words representing the second group of n-bit information word the portion comprising the second group of q code bits is converted into the first portion of the information word to be reconverted and the portion comprising the second group of s code bits is converted into the second portion of the n-bit information word to be reconverted.
Claim 4
Independent Claim
219 words
A method as claimed in any one of the preceding Claims, characterized in that p is greater than r and in that q is greater than s, the first group of n-bit information words comprising at least a first and a second sub-group of n-bit information words and the second group of n-bit information words comprising at least a third and a fourth sub-group of n bit information words, the conversion of the n-bit information words of the first and the second group being effected by converting the first portion of the n-bit information words into a q-bit sub-code word in accordance with a first conversion rule, the conversion of n-bit information words of the first and the third sub-group being effected by converting the second portion of the n-bit information words into s bit sub-code words in accordance with a second conversion rule, the conversion of n-bit information words of the second and the fourth sub-group of n-bit information words being effectedby converting the second portion of the n-bit information words into s-bit sub-code words in accordance with a third conversion rule, and the conversion of n-bit information words of the first and the second group being effected by combining the q-bit sub-code words and the s-bit sub-code words in a first manner and a second manner respectively.
Claim 5
Dependent Claim
147 words
A method as claimed in Claim 3, where n is 8 and where m is 11, the m-bit code words each comprising 4 code bits of a first logic value, characterized in that p is 5, r is 3, q is 6 and s is 5, the conversion of n-bit information words of the first and the third sub-group being effected by converting the first and the second portion of the n-bit information words respectively into q-bit sub-code words with 1 code bit of the first logic value and into s-bit sub-code words with 3 code bits of the first logic value and the conversion of n-bit information words of the second and the third sub-group being effected by converting the first portion and the second portion respectively into q-bit sub-code words and into s-bit code words each comprising two code bits of the first logic value.
Claim 6
Dependent Claim
262 words
An information-transmission system for carrying out the method as claimed in Claim 1, comprising an encoding device which is adapted to receive n-bit information words and to convert the received n-bit information words into m-bit code words, a decoding device which is adapted to receive the n-bit code words and to reconvert the received code words into n-bit information words, characterized in that the encoding device comprising means which derive from the received code word a first control signal which indicates to which of the first or the second group of n-bit information words the received code word belongs, means for converting the first portion of the information word into a first q -bit sub-code word, means for converting the second portion of an information word into an s-bit sub-code word, and means for combining thecode bits of the q-bit and s-bit sub-code words into an m-bit code word depending on the control signal in such a way that for a first logic level the code bits of the q-bit sub-code word and the s-bit code word correspond to the code bits of the m-bit code word to be formed at the first group of q code-bit positions and the first group of s-code-bit positions respectively, and in that for a second logic level the code bits of the q-bit and s-bit sub-code words correspond to the code bits of the m-bit code word to be formed respectively at the second group of q code-bit positions and the second group of s code-bit positions of a second group of n-bit code words.
Claim 7
Dependent Claim
159 words
An information-transmission system as claimed in Claim 5, characterized in that the decoding device comprises means for deriving a second logic control signal from each received m-bit code word, the logic value of said control signal indicating to which of the first or the second group of m-bit code words the received m-bit code word belongs, means for converting, depending on the logic value of the second control signal, the code bits at the first group of code-bit positions or the code bits at the second group of q code bit positions into p-bit sub-information word representing the first portion of the n-bit information word, means for converting, depending on the logic level of the second control signal, the code bits at the first group of s code-bit positions or the code bits at the second group of s code-bit positions into an r-bit sub-information word which represents the second portion of the n-bit information word to be reconverted.
Claim 8
Dependent Claim
97 words
An information-transmission system as claimed in Claim 5 or 6, characterized in that the encoding device comprises means for deriving a third control signal from each received n-bit information word, which third control signal indicates whether the received n-bit information word belongs to either the first or the third sub-group or to either the second or the third sub-group, the means for converting the second portion of the n-bit information word being adapted to convert the n-bit information word in conformity with a first conversion relationship or a second conversion relationship depending on the third control signal.
Claim 9
Dependent Claim
16 words
An encoding device for use in an information-transmission system as claimed in Claim 5 or 7.
Claim 10
Dependent Claim
15 words
A decoding device for use in an information transmission system as claimed in Claim 6.
References Cited (Backward Citations)
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