G - Physics – 10 – K
Patent
G - Physics
10
K
179/5
G10K 11/00 (2006.01) H03G 9/02 (2006.01) H04R 3/02 (2006.01) H04R 25/00 (2006.01)
Patent
CA 1214112
TITLE: NOISE REDUCTION SYSTEM INVENTOR: WILLIAM A. COLE ABSTRACT OF THE DISCLOSURE 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 spec- tral 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 discern- ment 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 asso- ciated 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.
438781
Bereskin & Parr
Linear Technology Inc.
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