Title:
SOUND DECODER AND SOUND DECODING METHOD
Document Type and Number:
WIPO Patent Application WO/1999/062055
Kind Code:
A1
Abstract:
A sound decoder (10) has a decoding unit (11) and an amplification control unit (12). The decoding unit (11) decodes a received coded sound signal (bit stream) BS and outputs a decoded sound signal SP. The amplification control unit (12) monitors occurrence of a frame error in the coded sound signal BS. When continuous frame errors more than a predetermined reference number of frame errors take place, the amplification control unit (12) outputs an amplification instruction after the continuous frame errors are absent for a time corresponding to a predetermined number of frames. As a result, in place of a codebook data DCB generated by the decoding by the decoding unit (11), amplified codebook data DACB generated by amplifying the codebook data DCB is fed to a synthesizing filter unit (17) and written as new original codebook data DCBO in a codebook decoder (18) of the decoding unit (11). Therefore, after continuous frame errors, a coded sound signal BS normally inputted can be decoded with an electric power which is nearly equal to the primarily needed electric power, and the subjective sound quality is improved.
Inventors:
NAKA NOBUHIKO (JP)
Application Number:
PCT/JP1999/002801
Publication Date:
December 02, 1999
Filing Date:
May 27, 1999
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE (JP)
NAKA NOBUHIKO (JP)
NAKA NOBUHIKO (JP)
International Classes:
G10L19/005; G10L19/04; G10L19/12; H03M7/30; H04B14/04; (IPC1-7): G10L9/14; H03M7/30; H04B14/04
Foreign References:
| JPH09101800A | 1997-04-15 | |||
| JPH09134198A | 1997-05-20 | |||
| JPH05113798A | 1993-05-07 |
Other References:
See also references of EP 1001541A4
Attorney, Agent or Firm:
Kawasaki, Kenji (Yaesumasuya Building 2-16, Nihonbashi 3-chome Chuo-ku Tokyo, JP)
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