Speech signal amplitude equalizer

Details Speech signal amplitude equalizer Speech signal amplitude equalizer

1976-08-12

1978-01-31

Claffy, Kathleen H.

179 1P, H03G 700, H03G 1104

Patent

active

040716953

ABSTRACT:
A speech signal amplitude equalizer (compressor) circuit normalizes the amplitude variations of a real-time input speech signal s(t) to form the normalized output signal r(t) which may be either of two values: a constant amplitude (unilevel) speech signal or a zero-amplitude (squelched) signal. The normalized output signal r(t)=s(t)/a(t)+K where the envelope signal a(t)=s.sup.2 (t)+s.sup.2 (t) in which s.sup.2 (t) is the Hilbert transform and K is a control signal which can take one of two levels depending upon the amplitude of the envelope signal being above or below certain thresholds in a hysteresis type logic circuit.

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J. Dugundji, "Envelopes and Pre-Envelopes . . .", IEEE Trans. Info., Theory, Mar. 1958.

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