Data processing: speech signal processing – linguistics – language – Speech signal processing – For storage or transmission
Patent
1996-07-26
1998-08-11
Hudspeth, David R.
Data processing: speech signal processing, linguistics, language
Speech signal processing
For storage or transmission
704204, 704229, G10L 700
Patent
active
057941793
ABSTRACT:
A digital acoustic signal of a time region information is divided into a plurality of sub-band groups, and the number of bits allocated to each data of the sub-band groups is reduced by a reducing number Nr in a quantizing unit according to a maximum value selected among energy values of pieces of data in each sub-band group, so that the digital acoustic signal of a frequency region information is produced. Thereafter, Nr bits are added to each data of the digital acoustic signal of the frequency region information in the inversely quantizing unit, and the data of all sub-bands are combined to produce a reproduced digital acoustic signal of the time region information. Thereafter, a residual signal indicating a difference between the digital-acoustic signal of the time region information and the reproduced digital acoustic signal of the time region information is produced, and the residual signal and the reproduced digital acoustic signal of the frequency region information are multiplexed. Therefore, when a reproduced digital acoustic signal of the time region information is produced from the reproduced digital acoustic signal of the frequency region information and is corrected according to the residual signal in a decoding operation, the digital acoustic signal can be efficiently coded and decoded while maintaining the redundancy.
REFERENCES:
patent: 5235671 (1993-08-01), Mazor
patent: 5459813 (1995-10-01), Klayman
patent: 5517511 (1996-05-01), Hardwick et al.
patent: 5600374 (1997-02-01), Shikakura
Hudspeth David R.
Storm Donald L.
Victor Company of Japan Ltd.
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