Very low bit rate voice messaging system using variable rate bac

Details Very low bit rate voice messaging system using variable rate bac Very low bit rate voice messaging system using variable rate bac

Filed on

1995-09-14

Date issued

1997-10-28

Examiner

MacDonald, Allen R.

Other Related Categories

G10L 900

Type

Patent

Status

active

Patent number

056824629

Description

ABSTRACT:
A method and apparatus is provided for a low bit rate speech transmission. Speech spectral parameter vectors are generated from a voice message and stored in a sequence of speech spectral parameter vectors within a speech spectral parameter matrix. A first index identifying a first speech parameter template corresponding to a first speech spectral parameter vector of the sequence of speech spectral parameter vectors is transmitted. A subsequent speech spectral parameter vector of the sequence is selected and a subsequent speech parameter template is determined having a subsequent index. One or more intervening interpolated speech parameter templates are interpolated between the first speech parameter template and the subsequent speech parameter template. The one or more intervening speech spectral parameter vectors are compared to the corresponding one or more intervening interpolated speech parameter templates to derive a distance. The subsequent index is transmitted when the distance derived is less than or equal to a predetermined distance.

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patent: 5357546 (1994-10-01), Meriwether et al.
patent: 5388146 (1995-02-01), Morduch et al.
patent: 5544277 (1996-08-01), Bakis et al.
Jayant and Noll, Digital Coding of Waveforms--Principles and Applications to Speech and Video, pp. 510-523 and pp. 546-563, Prentice-Hall, Inc., Englewood Cliffs, NJ, 1984.
Gersho and Gray, Vector Quantization and Signal Compression, pp. 605-626, Kluwer Academic Publishers, Norwell, MA, 1992.

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