CELP TYPE VOICE DECODING DEVICE AND VOICE DECODING METHOD

Japanese Patent JP3236852

B2

PROBLEM TO BE SOLVED: To enable searching of a noise code book with the computational cost of the same order as that in the case of using an algebraic structure sound source in the noise code book and to obtain a synthetic voice having high quality.
SOLUTION: After a quantization pitch gain is generated in a pitch gain quantizing part 114, the searching of a noise code book is performed. The quantization pitch gain is transmitted to a switch 108 for switching noise code books and when the value of the quantization pitch gain is small, the switch judges that an input voice is strong in a silent property to connect a noise code book A 101, when the value of the quantization pitch gain is large, the switch judges that the input voice is strong in a sounding property to connect a noise code book B 105. When the switch 108 is connected to the side of the noise code book A 101, a fixed waveform arranging part 103 respectively shifts fixed waveforms read out from a fixed waveform storage part 102 at positions selected from start end candidate positions based on the fixed waveform start end candidate positional information had by itself of the part 103 Then, respective shifted fixed waveforms are outputted to an adder 104 and they are added to become a noise code vector and it is inputted to a synthesis filter 110.

Kazutoshi Yasunaga
Toshiyuki Morii
Hiroyuki Ehara

JP2000156364A

December 10, 2001

February 19, 1997

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Matsushita Electric Industrial Co., Ltd

G10L19/12; G10L19/038; G10L19/10; G10L25/93; H03M7/30; H04B14/04; (IPC1-7): G10L19/12; G10L19/00; H03M7/30; H04B14/04

JP2280200A
JP2282800A
JP6130994A
JP6195098A

Koichi Washida (3 outside)

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