Title:
VOICE ENCODER/DECODER
Document Type and Number:
WIPO Patent Application WO/2001/020595
Kind Code:
A1
Abstract:
A voice encoding method using a synthesizing filter having a linear prediction coefficient obtained by dividing an input signal into frames of a fixed length and by linearly predicting/analyzing the input signal in units of a frame and comprising driving the synthesizing filter by a periodic signal outputted from an adaptive code book and a pulsating signal outputted from an algebraic structure code book, producing a reproduced signal, and minimizing the difference between the input signal and the reproduced signal to encode a voice, wherein there are prepared an encoding mode 1 using a pitch lag determined from the input signal of the present frame and an encoding mode 2 using a pitch lag determined from the input signal of a past frame. A mode capable of encoding the input signal more precisely with the encoding mode 1 and the encoding mode 2 is determined for each frame so that the encoding is carried out on the basis of the determined mode.
Inventors:
SUZUKI MASANAO (JP)
OTA YASUJI (JP)
TSUCHINAGA YOSHITERU (JP)
OTA YASUJI (JP)
TSUCHINAGA YOSHITERU (JP)
Application Number:
PCT/JP1999/004991
Publication Date:
March 22, 2001
Filing Date:
September 14, 1999
Export Citation:
Assignee:
FUJITSU LTD (JP)
SUZUKI MASANAO (JP)
OTA YASUJI (JP)
TSUCHINAGA YOSHITERU (JP)
SUZUKI MASANAO (JP)
OTA YASUJI (JP)
TSUCHINAGA YOSHITERU (JP)
International Classes:
G10L25/00; G10L19/09; G10L19/107; G10L19/12; G10L19/125; G10L19/22; (IPC1-7): G10L9/14
Foreign References:
| US5717825A | 1998-02-10 | |||
| US5754976A | 1998-05-19 | |||
| US5701392A | 1997-12-23 | |||
| JPH05346798A | 1993-12-27 | |||
| JPH05167457A | 1993-07-02 | |||
| JPH05173596A | 1993-07-13 | |||
| JPH10133696A | 1998-05-22 | |||
| JPH10232696A | 1998-09-02 |
Other References:
See also references of EP 1221694A4
Attorney, Agent or Firm:
Saito, Chimoto (Makuharihongo 1-chome Hanamigawa-ku Chiba-shi, Chiba, JP)
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