Method and apparatus for improving voice intelligibility in high

Details Method and apparatus for improving voice intelligibility in high Method and apparatus for improving voice intelligibility in high

1987-04-14

1988-09-13

Birmiel, Howard A.

Electrical audio signal processing systems and devices

Noise or distortion suppression

Interpolation

381107, 381110, H03G 320, H04B 110

Patent

active

047714727

ABSTRACT:
The output of a noise canceling first or second order electret gradient microphone in a very high noise environment has background noise attenuated and certain phonemes shaped to improve intelligibility by means of a slow action automatic gain control circuit 22 which matches dynamic range of the microphone 10 with dynamic range of the following communication channel, and a fast action automatic gain control circuit 24 in parallel with the first circuit, that reshapes puff noise into plosive, fricative and affricative speech component signals that produced the puff noise.

REFERENCES:
patent: 3991272 (1976-11-01), Tarr
patent: 4405831 (1983-09-01), Michelson
patent: 4410764 (1983-10-01), Werth et al.
patent: 4430754 (1984-02-01), Ishigaki
patent: 4442546 (1984-04-01), Ishigaki
patent: 4461025 (1984-07-01), Franklin
patent: 4466119 (1984-08-01), Peters et al.
patent: 4622692 (1986-11-01), Cole
patent: 4630302 (1986-12-01), Kryter

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