Automatic volume control to compensate for speech...

Details Automatic volume control to compensate for speech... Automatic volume control to compensate for speech...

2011-03-15

2011-03-15

Opsasnick, Michael N (Department: 2626)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

C704S225000

Reexamination Certificate

active

07908134

ABSTRACT:
A microphone detects acoustic waves from speakers, or for a two-way voice communication device, a user's voice and background noise, and produces a corresponding signal; a subtractor finds the difference between the microphone signal and a desired audio signal; a transform process produces over a time period a signal corresponding to the amplitude of each frequency component of the difference signal; from the transform process a bandpass filter passes only frequency components within selected bands; a speech interference noise level calculator calculates a combination of the amplitudes of the bandpass filtered frequency components; and a solver uses the combination to produce, according to an algorithm, a signal for controlling the gain of an audio amplifier. Phase and amplitude correlation can be done prior to subtraction.

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