Speech encoder with features extracted from current and previous

Details Speech encoder with features extracted from current and previous Speech encoder with features extracted from current and previous

1996-01-17

1998-07-28

Tung, Kee M.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704223, 704229, G10L 302

Patent

active

057873895

ABSTRACT:
In a speech signal encoder device comprising a frame divider (31) for producing original speech frames, a mode decision circuit (49) decides a predetermined number of modes by using feature quantities which are extracted from each current speech frame segmented from an input speech signal at a predetermined frame period of as short as 5 ms and from a previous speech frame segmented at least one frame period prior to the current speech frame. Preferably, a weighing circuit (47) provides the current speech frame by perceptually weighting the original speech frames into weighed speech frames. It is possible to provide the feature quantities by a primary quantity and as a secondary quantity by a rate of variation in the primary quantity. Each feature quantity is preferably adjusted into an adjusted quantity in response to each current mode decided by using the current speech frame and a previous mode decided at least one frame period prior to the current mode. Each feature quantity may be a pitch prediction gain, a short-period predicted gain, a level, or a pitch of each original speech frame.

REFERENCES:
patent: 5142584 (1992-08-01), Ozawa
patent: 5195166 (1993-03-01), Hardwick et al.
patent: 5327520 (1994-07-01), Chen
patent: 5371853 (1994-12-01), Kao et al.
patent: 5602961 (1997-02-01), Kolesnik et al.
"M-LCELP Speech Coding at 4 KBPS", Ozawa et al, ICASSP '94, pp. 269-272.
Ozawa, et al., "M-LCELP Speech Coding at 4 kb/s with Multi-Mode and Multi-Codebook", vol. E77-B, No. 9, pp. 1114-1121, Sep. 1994.
Nomura et al., "LSP Coding Usng VQ-SVQ With Interpolation In 4,075 KBPS M-LCELP Speech Coder", Proc. Mobile Multimedia Communications, pp. B.2.5-1-B.2.5-4, (1933).
Taniguchi et al., "Improved CEOP Speech Coding at 4 KBIT/s And Below", Proc. ICSLP, pp. 41-44, (1992).

Affiliated with

Also associated with

Rating

Speech encoder with features extracted from current and previous does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Speech encoder with features extracted from current and previous, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Speech encoder with features extracted from current and previous will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-34445