Speech mode based multi-stage vector quantizer

Details Speech mode based multi-stage vector quantizer Speech mode based multi-stage vector quantizer

1997-10-28

1999-10-12

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704219, G10L 302

Patent

active

059666889

ABSTRACT:
A speech mode based multi-stage vector quantizer is disclosed which quantizes and encodes line spectral frequency (LSF) vectors that were obtained by transforming the short-term predictor filter coefficients in a speech codec that utilizes linear predictive techniques. The quantizer includes a mode classifier that classifies each speech frame of a speech signal as being associated with one of a voiced, spectrally stationary (Mode A) speech frame, a voiced, spectrally non-stationary (Mode B) speech frame and an unvoiced (Mode C) speech frame. A converter converts each speech frame of the speech signal into an LSF vector and an LSF vector quantizer includes a 12-bit, two-stage, backward predictive vector encoder that encodes the Mode A speech frames and a 22 bit, four-stage backward predictive vector encoder that encodes the Mode 13 and the Mode C speech frames.

REFERENCES:
patent: 5495555 (1996-02-01), Swaminathan
patent: 5596676 (1997-01-01), Swaminathan et al.
patent: 5596677 (1997-01-01), Jarvinen et al.
patent: 5651026 (1997-07-01), Lin et al.
patent: 5732389 (1998-03-01), Kroon et al.
patent: 5734789 (1998-03-01), Swaminathan et al.
patent: 5751903 (1998-05-01), Swaminathan et al.
patent: 5774837 (1998-06-01), Yeldener et al.
Mano et al, "Design of a Pitch Synchronous Innovation CELP Coder for Mobile Communications", IEEE Journal on Selected Areas in Communications, Jan. 1995.
Quiros et al, "Analysis and Quantization Procedures for a real-Time Implementation of a 4.8 kb/s CELP Coder", ICASSP 1990, Feb. 1990.
Chiu et al, "A dual-band excitation LSP codec for very low bit rate transmission", Speech Image Processing, and Neural Networks, 1994 Int'l Symposium, Jan. 1994.

Affiliated with

Also associated with

Rating

Speech mode based multi-stage vector quantizer 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 mode based multi-stage vector quantizer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Speech mode based multi-stage vector quantizer will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-662395