SOUND SIGNAL CODING METHOD AND SOUND SIGNAL DECODING METHOD - Nippon Telegraph and Telephone Corporation

Title:

SOUND SIGNAL CODING METHOD AND SOUND SIGNAL DECODING METHOD

Document Type and Number:

Japanese Patent JP3472974

Kind Code:

B2

Abstract:

PROBLEM TO BE SOLVED: To maintain continuity between frames and enable prediction in the time region and filter processing.
SOLUTION: One frame (N points) of input samples is duplicated and every two N points are taken out (11) and applied with 2 N points of window functions (12) to obtain 2N points of X(n). Then the first N/2 length of x(i) where i=0,..., N/2-1 are inversed in the order of time to be subtracted from the next N/2 of x(i) where i=N/2..., N-1 and the final N/2 length of x(i) where i=N+N/2,..., 2N-1 are inversed in the order or time to be added to immediately proceeding N/2 of x(i) where i=N,..., N+N/2-1 for pre-processing (41). After that, inverse filter processing (42) is applied to the results y(n) of this to obtain a residual signal z(n), which is Discrete Cosine Transformed(DCT) to obtain a frequency region coefficient v(k) (33) to subject to weighted quantization.

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Inventors:

Takehiro Moriya
Akio Jin
Naoki Iwakami
Kazunaga Ikeda
Satoshi Miki

Application Number:

JP28503196A

Publication Date:

December 02, 2003

Filing Date:

October 28, 1996

Export Citation:

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Assignee:

Nippon Telegraph and Telephone Corporation

International Classes:

G10L19/038; G10L19/02; G10L19/04; G10L19/08; G10L25/45; H03M7/30; H04B14/04; (IPC1-7): G10L19/08; G10L19/04; H03M7/30; H04B14/04

Domestic Patent References:

JP444099A
JP6232824A

Attorney, Agent or Firm:

Suguru Kusano

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