Digital speech interpolation system

Details Digital speech interpolation system Digital speech interpolation system

1979-08-30

1981-12-01

Nusbaum, Mark E.

Weighing scales

With total register

179 1555T, H04J 602

Patent

active

043038034

ABSTRACT:
A digital speech interpolation system is combined with an adaptive differential PCM (ADPCM), employing a speech detector for detecting speech signals and for discriminating voiced and unvoiced sounds. An adaptive quantization bit assignment to the speech is adopted to cope with any freeze-out condition. And further PCM speech signals with 8 KHz sampling are applied to ADPCM after shifted 250 Hz down and then converted into 6 KHz sampling frequency, thereby attaining a total gain of about 7 without degrading speech quality.

REFERENCES:
patent: 3431356 (1969-03-01), Copel
patent: 4064363 (1977-12-01), Malm
patent: 4142071 (1979-02-01), Croisier et al.
patent: 4149039 (1979-04-01), Yuguchi et al.
patent: 4167653 (1979-09-01), Araseki et al.

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