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EP0279909A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Variable lenght code and devices for high frequency transmission

Assignee: Telettra Laboratori di Telefonia Elettronica e Radio SpA
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Filing: 1987-10-23
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Granted: —
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Expires: 2007-10-23
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Abstract

Abstract The invention concerns a code with variable length of a type prefix/suffix ( [px..] sx), suitable for the parallel treatment of the words of said code, in particular for the compactation of said words into constant length packets at the transmission end and to the successive extraction at the receive end. The code permits to separate at the receive end, the two operations of EXTRACTION and DECODING; essentially this may result in high speed applications wherein these operations cannot be performed within the clock cycle. Besides said code permits the EXTRACTION operation to be simplified by considerably reducing the dimensions of the necessary hardware. Its efficiency with particular distributions of messages is particularly high (97-98%). Finally a detailed analysis is given of an application with a particular step code [px..] sx.

Inventors

  • 👤 Silvio Cucchi
  • 👤 Vittorio Corradi
  • 👤 Stefano Capriata

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-09 19:30
CPC Classifications
H; H03; H03M; H03M7/00; H03M7/30; H03M7/40; H03M7/42

Claims Analysis

Total Claims: 12
Claim 1
Independent Claim 57 words
1) System for paralleling words W with length WL and variable frequency, characterized by the fact that it operates with a step code [px..] sx, i.e each word W (except the word with maximum length N) is formed by a sequence of a number varying from O to N/St of prefixes followed by only one suffix sx.
Claim 2
Dependent Claim 57 words
1) System for paralleling words W with length WL and variable frequency, characterized by the fact that it operates with a step code [px..] sx, i.e each word W (except the word with maximum length N) is formed by a sequence of a number varying from O to N/St of prefixes followed by only one suffix sx.
Claim 3
Dependent Claim 68 words
2) System according to claim 1, characterized by the fact that the length of each prefix px and suffix sx of said code equals a value St (step) from time to time constant, so that length WL of each word W belonging to said code is a multiple of step St according to the following equation: 1 = n * St (1 < = n < = N/St)
Claim 4
Dependent Claim 50 words
3) System according to claim 2, characterized by the fact that words W of said code are transmitted in packets with length M from time to time multiple constant of said step St as per the following equation: M = m * St (1 < = m < = M/St)
Claim 5
Dependent Claim 7 words
4) System according to description and representation.
Claim 6
Dependent Claim 7 words
4) System according to description and representation.
Claim 7
Dependent Claim 64 words
5) Device to implement the system according to the above claims, characterized by the fact that at the transmit end a word compacter WC is inserted between coder C and buffer B, which word compacter receives words W with variable length WL from coder C and transmits to buffer B packets of bits with constant length M by operating at peak frequency equalling N/M*Fs.
Claim 8
Dependent Claim 61 words
6) Device to implement the system according to claims 1-3, characterized by the fact that at the receive end a word extractor WE is inserted between buffer B and decoder D, which extractor receives packets of bits with constant length M from buffer B and transmits to decoder D words W with variable length WL operating at peak frequency equalling N/M*Fs.
Claim 9
Dependent Claim 24 words
7) Device according to claim 5, characterized by a word compacter as shown in figures 8a, 8b, 8c for the case where N=M=16, St=2.
Claim 10
Dependent Claim 26 words
8) Device according to claim 6), characterized by a word compacter as shown in figures 9a, 9b, 9c, 9d, 9e for the case where N=M=16, St=2.
Claim 11
Dependent Claim 9 words
9) Devices and circuitry according to description and representa­tion.
Claim 12
Dependent Claim 9 words
9) Devices and circuitry according to description and representa­tion.

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