| US 7,577,566 B2 | ||
| Method for encoding sound source of probabilistic code book | ||
| Toshiyuki Morii, Kawasaki (Japan) | ||
| Assigned to Panasonic Corporation, Osaka (Japan) | ||
| Appl. No. 10/531,417 PCT Filed Nov. 11, 2003, PCT No. PCT/JP03/14298 § 371(c)(1), (2), (4) Date Jun. 02, 2005, PCT Pub. No. WO2004/044893, PCT Pub. Date May 27, 2004. |
||
| Claims priority of application No. 2002-330768 (JP), filed on Nov. 14, 2002. | ||
| Prior Publication US 2005/0228653 A1, Oct. 13, 2005 | ||
| Int. Cl. G10L 19/10 (2006.01); G10L 19/12 (2006.01) | ||
| U.S. Cl. 704—221 [704/212; 704/223] | 4 Claims |
| 1. A coding method of an excitation vector of a stochastic codebook used in a speech coding apparatus that is divided into
a plurality of channels, the coding method comprising:
associating an excitation vector waveform candidate of a predetermined channel with an excitation vector waveform candidate
of another channel, such that the excitation vector waveform candidate of the predetermined channel changes in association
with a change of a number representing the excitation vector waveform candidate of the another channel;
searching for an excitation vector waveform that minimizes coding distortion using the associated excitation vector waveform
candidate of the predetermined channel and the excitation vector waveform candidate of the another channel; and
determining a code of the excitation vector of the stochastic codebook using a code of the excitation vector waveform obtained
by the searching, wherein:
the searching, after the associating, calculates a function value using the number representing the changed excitation vector
waveform candidate of the another channel and the excitation vector waveform candidate of the predetermined channel changed
based on the associating, and, by the function value, finds an excitation vector waveform candidate of each channel that minimizes
the coding distortion; and
the determining finds the code of the excitation vector waveform by coding the excitation vector waveform candidate of each
channel that minimizes the coding distortion as the excitation vector waveform, and determines the code of the excitation
vector of the stochastic codebook using the code of the excitation vector waveform.
|