Variable framerate parameter encoding

Details Variable framerate parameter encoding Variable framerate parameter encoding

1996-09-19

1998-09-08

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

G10L 900

Patent

active

058060278

ABSTRACT:
A novel approach to parameter encoding is presented which improves coding efficiency and performance by exploiting the variable rate nature of certain classes of signals. This is achieved using an interpolative variable frame-rate breakpointing scheme referred to as adaptive frame selection (AFS). In the approach described in this report, frame selection is achieved using a recursive dynamic programming algorithm; the resulting parameter encoding system is referred to as adaptive frame selection using dynamic programming (AFS/DP). The AFS/DP algorithm determines optimal breakpoint locations in the context of parameter encoding using an arbitrary objective performance measure, and operates in a fixed bit-rate, fixed-delay context with low computational requirements. When applied to the problem of low bit-rate coding of speech spectral and gain parameters, the AFS/DP algorithm is capable of improving the perceptual quality of coded speech and robustness to quantization errors over fixed frame-rate approaches.

REFERENCES:
patent: 5255339 (1993-10-01), Fette et al.
Spanias, Andrew S., "Speech Coding: A Tutorial Review", Proceedings of the IEEE, vol. 82, No. 10, Oct. 1994, pp. 1541-1582.
Gray, Robert M., "Vector Quantization", IEEE ASSP Magazine, Apr. 1984, pp. 4-29.
E. Bryan George, "Variable Frame Rate Parameter Encoding Via Adaptive Frame Selection Using Dynamic Programming", ICASP 1996.
McCree, et al., "A Mixed Excitation LPC Vocoder Model for Low Bit Rate Speech Coding," IEEE 1995 (1063-6676/95).

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