Speech presence detector based on sparse time-random signal samp

Details Speech presence detector based on sparse time-random signal samp Speech presence detector based on sparse time-random signal samp

1995-01-31

1998-10-13

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

Recognition

704228, G10L 918

Patent

active

058227261

ABSTRACT:
A speech presence detector (101) includes a circuit input (105) to couple to a source of input signals. A control signal generator (113) generates control signals. A sampling circuit (112) samples the input signals as a function of the control signal. A processor (116, 616, or 916) is coupled to the sampling circuit to receive the signal samples. The processor is responsive to the sampled signals to identify a background noise threshold and detect the presence of speech. According to one embodiment, the method and apparatus employ a random control signal. According to another embodiment, the average frequency of the control signal is below the Nyquist rate. According to another embodiment, the processor is responsive to the received signal to count the number of samples within a predetermined amplitude range and identifies a background noise threshold from the number of samples which are in the predetermined range.

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Mischa Schwartz, William R. Bennett, and Seymour Stein, Communication Systems and Techniques, McGraw-Hill Book Company, pp. 3-4,46-50,82-83, 1966.

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