Speech encoding at variable bit rate

Details Speech encoding at variable bit rate Speech encoding at variable bit rate

1997-12-05

1999-08-03

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704221, 704219, 704228, 704216, G10L 900

Patent

active

059338032

ABSTRACT:
The invention is related digital speech encoding. In a speech codec according to the invention, for modeling a speech signal (301) both prediction parameters (321, 322, 331) modeling a speech signal in a short term and prediction parameters (341, 342, 351) modeling a speech signal in a long term are used. Each prediction parameter (321, 322, 331, 341, 342, 351) is presented using a certain accuracy, in a digital system with a certain number of bits. In speech encoding according to the invention the number of bits used for presenting prediction parameters (321, 322, 331, 341, 342, 351) is adjusted based upon information parameters (321, 322, 331, 341, 342, 351) obtained from a short-term LPC-analysis (32) and from a long-term LTP-analysis (31, 34, 35). The invention is particularly suitable for use at low data transfer speeds, because it offers a speech encoding method of even quality and low average bit rate.

REFERENCES:
patent: 4868867 (1989-09-01), Davidson et al.
patent: 4890328 (1989-12-01), Prezas
patent: 4969192 (1990-11-01), Chen et al.
patent: 5091945 (1992-02-01), Kleijn
patent: 5233660 (1993-08-01), Chen
patent: 5265167 (1993-11-01), Akamine et al.
patent: 5307441 (1994-04-01), Tzeng
patent: 5327520 (1994-07-01), Chen
patent: 5414796 (1995-05-01), Jacobs et al.
patent: 5444816 (1995-08-01), Adoul et al.
patent: 5483668 (1996-01-01), Malkamaki et al.
patent: 5553191 (1996-09-01), Minde
patent: 5579433 (1996-11-01), Jarvinen
Peter Kroon & Bishnu S. Atal, "Pitch Predictors with High Temporal Resolution", Proc. of ICASSP-90, pp. 661-664.
ETSI GSM 06.60 version 5.1.2, Mar. 1997.

Affiliated with

Also associated with

Rating

Speech encoding at variable bit rate 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 encoding at variable bit rate, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Speech encoding at variable bit rate will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-860245