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Title:
HIGH-EFFICIENCY ENCODING METHOD
Document Type and Number:
WIPO Patent Application WO/1993/019459
Kind Code:
A1
Abstract:
A high-efficiency method for encoding data on the frequency axis obtained by dividing an input audio signal in a block unit and converting it to the frequency axis, wherein a band B¿VH? having the highest center frequency among V (voiced) bands is sought when the number of change point of discrimination data of V (voiced sound)/UV (unvoiced sound) of all the bands on the on-frequency-axis data is judged greater than 1, the number N¿V? of the V bands up to the band B¿VH? is determined, whether or not their proportion is greater than a predetermined threshold value N¿th? is judged, and one V/UV division position is determined. In this way, the V/UV judgement data for each band is converted to the data of one division position inside all the bands, so that the data quantity and the bit rate can be reduced. The quantity of computation of the code book search is reduced by using two-stage hierarchical vector quantitization when the on-frequency-axis data is quantitized, and the memory capacity of the code book is reduced.

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Inventors:
NISHIGUCHI MASAYUKI (JP)
MATSUMOTO JUN (JP)
ONO SHINOBU (JP)
Application Number:
PCT/JP1993/000323
Publication Date:
September 30, 1993
Filing Date:
March 18, 1993
Export Citation:
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Assignee:
SONY CORP (JP)
International Classes:
G10L19/02; G10L19/038; G10L19/12; G10L19/18; G10L25/90; G10L25/93; G10L19/04; G10L19/10; G10L25/27; (IPC1-7): G10L7/00; G10L7/04; G10L9/18
Foreign References:
JPS62271000A1987-11-25
JPH027100A1990-01-11
JPS592033B21984-01-17
JPS5853357B21983-11-29
JPS62147500A1987-07-01
JPH04122999A1992-04-23
JPS63201700A1988-08-19
Other References:
See also references of EP 0590155A4
Attorney, Agent or Firm:
Koike, Akira (11 Mori Bldg. 6-4, Toranomon 2-chom, Minato-ku Tokyo 105, JP)
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