Speech enhancement system having dynamic gain control

Details Speech enhancement system having dynamic gain control Speech enhancement system having dynamic gain control

1985-07-12

1988-05-24

Kemeny, E. S.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

330136, 455245, G10L 500

Patent

active

047471433

ABSTRACT:
An arrangement for a speech enhancement processor which maintains the processed speech at a constant level regardless of large changes in the associated noise level. The composite speech and noise signal is applied to a first AGC circuit and then to a speech enhancement system which removes tonal, impulse, and wideband noises from the signal. The extracted noise power estimates are subtracted from the constant amplitude signal to provide a gain control signal value to which the gain of a second variable gain amplifier is inversely proportional. The amplifier multiplies the processed speech output from the enhancement system and, because of the variable gain control, provides an output speech signal having short-term amplitude levels which correspond to those of the input speech signal, and having a constant long-term amplitude level.

REFERENCES:
patent: 3989897 (1976-11-01), Carver
patent: 4028496 (1977-06-01), La Marche et al.

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