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Title: US5007092: Method and apparatus for dynamically adapting a vector-quantizing coder codebook
[ Derwent Title ]

Country: US United States of America

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15 pages

Inventor: Galand, Claude; Cagnes Sur Mer, France
Menez, Jean; Cagnes Sur Mer, France
Rosso, Michele; Nice, France

Assignee: International Business Machines Corporation, Armonk, NY
other patents from INTERNATIONAL BUSINESS MACHINES CORPORATION (280070) (approx. 44,393)
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Published / Filed: 1991-04-09 / 1989-10-13

Application Number: US1989000420966

IPC Code: Advanced: G06T 9/00; G10L 19/06; H03M 7/30;
IPC-7: G10L 7/02;

ECLA Code: G06T9/00V; G10L19/06;

U.S. Class: Current: 704/222; 704/212; 704/219; 704/E19.024;
Original: 381/036;

Field of Search: 381/029-41 364/513.5 375/122

Priority Number:
1988-10-19  EP1988000480060

Abstract: A signal vector quantizing coder (CELP) is provided with an adaptive codebook originally loaded with preselected codewords. The codebook is split into a fixed contents portion and a fixed length adaptive contents portion. During coding operations, the codewords dynamically selected for coding the coder input signal are shifted into the fixed length adaptive codebook section for codebook contents updating purposes.

Attorney, Agent or Firm: Duffield, Edward H. ;

Primary / Asst. Examiners: Shaw, Dale M.; Merecki, John A.

Maintenance Status: E3 Expired  Check current status

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Designated Country: DE FR GB IT 

Family: Show 6 known family members

First Claim:
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We claim:     1. In a vector quantizing coder for coding a sequence of input signal samples into a codebook address pointing at a prestored codeword selected for providing the lowest mean square error with said sequence, a method for dynamically updating said codebook during coding, said method including:
  • splitting the codebook into a fixed content portion and a fixed length adaptive content portion;
  • updating said codebook by shifting into said fixed length adaptive content portion each selected codeword, whereby a previously stored codeword is shifted out of said fixed length adaptive content portion.

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Forward References: Show 28 U.S. patent(s) that reference this one

U.S. References: Go to Result Set: All U.S. references   |  Forward references (28)   |   Backward references (1)   |   Citation Link

Patent  Pub.Date  Inventor Assignee   Title
Get PDF - 7pp US4720861  1988-01 Bertrand  ITT Defense Communications a Division of ITT Corporation Digital speech coding circuit
Foreign References: None

Other Abstract Info: DERABS G90-125913

Other References:
  • Paul, "An 800BPS Adaptive Vector Quantization Vocoder Using A Perceptual Distance Measure", ICASSP 83, pp. 73-76.
  • Makhoul et al., "Vector Quantization in Speech Coding", IEEE Proceedings, vol. 73, No. 11, 11/85, pp. 1551-1588. (38 pages) Cited by 38 patents

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