Patent EP0145396A2 successfully refreshed from Google Patents.
EP0145396A2
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Codeword decoding
Assignee: Crosfield Electronics Ltd
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Filing: 1984-11-26
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Granted: —
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Expires: 2004-11-26
Abstract
Abstract A method and apparatus for decoding a digital codeword of a codeword system comprising digital codewords of varying length in which no short codeword forms the prefix of a longer codeword in the same system comprises detecting with means (26) whether the codeword has a predetermined prefix, the predetermined prefix being shorter than any codeword containing it. Further means (26) are provided for decoding only the suffix of the codeword or the entire codeword respectively according to whether or not the predetermined prefix is detected.
Inventors
- 👤 Peter Fraser Ross
- 👤 Ian William Rodgers
- 👤 Rupert Leslie Alexander Goodings
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 02:19
CPC Classifications
H; H03; H03M; H03M7/00; H03M7/30; H03M7/40; H03M7/42; H03M7/425
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
77 words
A method of decoding a digital codeword of a codeword system comprising digital codewords of varying length in which no short codeword forms the prefix of a longer codeword in the same system, the method comprising detecting whether the codeword has a predetermined prefix, the predetermined prefix being shorter than any codeword containing it; and decoding only the suffix of the codeword or the entire codeword respectively according to whether or not the predetermined prefix is detected.
Claim 2
Independent Claim
77 words
A method of decoding a digital codeword of a codeword system comprising digital codewords of varying length in which no short codeword forms the prefix of a longer codeword in the same system, the method comprising detecting whether the codeword has a predetermined prefix, the predetermined prefix being shorter than any codeword containing it; and decoding only the suffix of the codeword or the entire codeword respectively according to whether or not the predetermined prefix is detected.
Claim 3
Dependent Claim
19 words
A method according to claim 1, comprising detecting whether the codeword has one of a number of predetermined prefixes.
Claim 4
Dependent Claim
48 words
A method according to claim 1 or claim 2, further comprising detecting whether the suffix has a predetermined prefix; and decoding only the sub-suffix of the suffix of the codeword or the entire suffix of the codeword respectively according to whether or not the predetermined prefix is detected.
Claim 5
Dependent Claim
82 words
Apparatus for decoding a digital codeword of a codeword system comprising digital codewords of varying length in which no short codeword forms the prefix of a longer codeword in the same system, the apparatus comprising means (26) for detecting whether the codeword has a predetermined prefix, the predetermined prefix being shorter than any codeword containing it; and means (26) for decoding either the suffix of the codeword or the entire codeword respectively according to whether or not the predetermined prefix is detected.
Claim 6
Dependent Claim
82 words
Apparatus for decoding a digital codeword of a codeword system comprising digital codewords of varying length in which no short codeword forms the prefix of a longer codeword in the same system, the apparatus comprising means (26) for detecting whether the codeword has a predetermined prefix, the predetermined prefix being shorter than any codeword containing it; and means (26) for decoding either the suffix of the codeword or the entire codeword respectively according to whether or not the predetermined prefix is detected.
Claim 7
Dependent Claim
31 words
Apparatus according to claim 4, wherein the decoding means comprises first means (26) for decoding the prefix or the entire codeword as required; and second means (26) for decoding the suffix.
Claim 8
Dependent Claim
17 words
Apparatus according to claim 4 or claim 5, wherein the decoding means are provided by PROMs (26).
References Cited (Backward Citations)
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