Noise reduction system

Details Noise reduction system Noise reduction system

1984-10-10

1986-11-11

Dwyer, James L.

Electrical audio signal processing systems and devices

Noise or distortion suppression

Interpolation

381107, 381108, 381 68, H04R 2500

Patent

active

046226923

ABSTRACT:
Electronic circuitry as described which enhances the intelligibility of a speech signal corrupted by low-frequency noise while tending to retain frequency components of the signal characteristic of natural-sounding speech. The circuitry includes a broad band channel which passes the speech signal with little spectral distortion. A high-pass channel produces a high-pass signal corresponding to high-frequency components of the speech signal, components which in themselves provide the human ear with considerable information for discernment of different sounds. An operational amplifier in a summing configuration combines the broadband and high-pass signals to produce a processed speech signal with enhanced intelligibility. Gain control circuitry associated with the high-pass channel reduces gain in the high-pass channel with increasing intensity of high-frequency speech signal components thereby tending to enhance the speech signal to an increasing degree at low signal levels and to otherwise produce a processed speech signal suitable for reproduction of natural-sounding speech.

REFERENCES:
patent: 3818149 (1974-06-01), Stearns et al.
van den Brink, "Improved DNL", Elektor, Jul., Aug. 1979, pp. 7-08-7-09.

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