REW parametric vector quantization and dual-predictive SEW vector quantization for waveform interpolative coding

• US 7,010,482 B2
• Filed: 03/16/2001
• Issued: 03/07/2006
• Est. Priority Date: 03/17/2000
• Status: Active Grant

• Current Assignee: Regents of the University of California (University of California)
• Original Assignee: Regents of the University of California (University of California)
• Inventors: Gottesman, Oded, Gersho, Allen
• Primary Examiner(s): MCFADDEN, SUSAN IRIS
• Application Number:
  US09/811,187
• Publication Number:
  US 20020116184A1
• Time in Patent Office: 1,817 Days
• Field of Search: 704/230, 704/211, 704219-223, 704/225, 704/229, 704/270, 704/500
• US Class Current: 704/222
• CPC Class Codes: G10L 19/097 using prototype waveform decomposition or prototype waveform interpolative [PWI] coders

Abstract

An enhanced analysis-by-synthesis waveform interpolative speech coder able to operate at 2.8 kbps. Novel features include dual-predictive analysis-by-synthesis quantization of the slowly-evolving waveform, efficient parametrization of the rapidly-evolving waveform magnitude, and analysis-by-synthesis vector quantization of the rapidly evolving waveform parameter. Subjective quality tests indicate that it exceeds G.723.1 at 5.3 kbps, and of G.723.1 at 6.3 kbps.

Claims

1. A method for interpolative coding input signals, said signals decomposed into or composed of a slowly evolving waveform and a rapidly evolving waveform having a magnitude, the method incorporating at least one of the following steps:

(a) analysis-by-synthesis vector quantization of the rapidly evolving waveform parameter;

(b) parametrizing the magnitude of the rapidly evolving waveform;

(c) incorporating temporal weighting in the AbS VQ of the REW;

or

(d) incorporating spectral weighting in the AbS VQ of the REW;

the method either (1) applying a filter to a vector quantizer codebook in the analysis-by-synthesis vector-quantization of the rapidly evolving waveform whereby to add self correlation to the codebook vectors or (2) using a coder in which a plurality of bits therein are allocated to the rapidly evolving waveform magnitude.

2. The method of claim 1 further comprising analysis-by-synthesis vector quantization of the slowly evolving waveform.

3. The method of claim 1 wherein said signal is speech.

4. The method of claim 1 wherein said method incorporates each of steps (a) through (c).

5. A method for interpolative coding input signals, said signals decomposed into or composed of a slowly evolving waveform and a rapidly evolving waveform having a magnitude, comprising:

(a) analysis-by-synthesis vector quantization of the rapidly evolving waveform parameter;

(b) analysis-by-synthesis quantization of the slowly evolving waveform;

(c) parametrizing the magnitude of the rapidly evolving waveform;

(d) incorporating temporal weighting in the analysis-by-synthesis vector quantization of the rapidly evolving waveform; and

(e) incorporating spectral weighting in the analysis-by-synthesis vector quantization of the rapidly evolving waveform

the method either (1) applying a filter to a vector guantizer codebook in the analysis-by-synthesis vector-quantization of the rapidly evolving waveform whereby to add self correlation to the codebook vectors or (2) using a coder in which a plurality of bits therein are allocated to the rapidly evolving waveform magnitude.

6. The method of claim 5 in which in the step of analysis-by-synthesis of a first vector-quantization of the slowly evolving waveform is predicted based on the vector quantization of the rapidly evolving waveform and a second vector quantization of the slowly evolving waveform.

7. A method for interpolative coding input signals, said signals decomposed into or composed of a rapidly evolving waveform, comprising incorporating analysis-by-synthesis vector quantization of the rapidly evolving waveform parameter, the method either (1) applying a filter to a vector guantizer codebook in the analysis-by-synthesis vector-quantization of the rapidly evolving waveform whereby to add self correlation to the codebook vectors or (2) using a coder in which a plurality of bits therein are allocated to the rapidly evolving waveform magnitude.

8. A speech coding system using waveform interpolation comprising at least one of the following steps:

(a) analysis-by-synthesis vector quantization of a rapidly evolving waveform parameter;

(b) parametrizing a magnitude of a rapidly evolving waveform;

(c) incorporating temporal weighting in the AbS VQ of the REW;

or

(d) incorporating spectral weighting in the AbS VQ of the REW;

the method either (1) applying a filter to a vector quantizer codebook in the analysis-by-synthesis vector-quantization of the rapidly evolving waveform whereby to add self correlation to the codebook vectors or (2) using a coder in which a plurality of bits therein are allocated to the rapidly evolving waveform magnitude.