Aid to hearing speech in a noisy environment

Details Aid to hearing speech in a noisy environment Aid to hearing speech in a noisy environment

H - Electricity

04

R

H04R 25/00 (2006.01)

Patent

CA 2132739

2132739 9320669 PCTABS00027 A signal processing circuit is incorporated into an audio reproducing device for suppressing noise while preserving distinctive features of speech. A noise detecting circuit includes a low pass filtering circuit (12) and a level detector (14). An output signal (C) from the detecting circuit controls a variable high pass filtering circuit (20) to attenuate a range of low frequencies of an input signal (A) proportional to the detected level of noise. The variable high pass filtering circuit exhibits a family of variable response curves (22, 24, and 26) that vary in slope below a common cut-off frequency (28) that is below a range of frequencies that convey a majority of second formant transitions between consonants and vowels.

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