Title:
“前方”および“後方”LPC分析による音声周波数信号を符号化するための方法および装置
Document Type and Number:
Japanese Patent JP3564144
Kind Code:
B2
Abstract:
A method and device for encoding a digital audio-signal divided into a succession of blocks according to a LPC "forward" and "backward" analysis respectively under a choice criterion. For coding each current block, the choice criterion is established by defining the degree of stationarity of the digital audio-signal according to a stationarity parameter belonging to a maximum and a minimum stationarity range value. An analysis choice value is established from a decision function and this stationarity parameter and thus applied to the digital audio-signal to have this audio digital signal encoded by "backward" LPC filtering for stationary zones. The "forward" and "backward" filtering mode are thus performed in relation to the degree of stationarity of the audio digital signal, the amount of switching from one to the other filtering modes being thus limited.
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Inventors:
Proust, Stefan
Application Number:
JP54355598A
Publication Date:
September 08, 2004
Filing Date:
April 09, 1998
Export Citation:
Assignee:
FRANCE TELECOM
International Classes:
G10L19/18; H04B14/04; G10L19/06; (IPC1-7): G10L19/04; G10L19/12; H04B14/04
Domestic Patent References:
| JP5175916A | ||||
| JP1022639B2 | ||||
| JP63027900A | ||||
| JP6348293A | ||||
| JP3071720B2 |
Attorney, Agent or Firm:
Masatake Shiga
Takashi Watanabe
Takashi Watanabe