Electrical audio signal processing systems and devices – Hearing protectors – electrical
Patent
1994-09-02
1996-08-27
Kuntz, Curtis
Electrical audio signal processing systems and devices
Hearing protectors, electrical
381 94, 381103, H03G 500
Patent
active
055509231
ABSTRACT:
An ear device protects a user from damaging sound levels while permitting the user to hear and understand conversation in a noisy environment. The device includes an enclosure system for at least partially isolating the user's ear drums from ambient sounds, at least on directional microphone, an adaptive band pass filter and a speaker. The adaptive band pass filter further includes adaptive high pass and adaptive low pass filters which adaptively and independently control the range of the pass band depending upon the characteristics of the noise in the user's environment. A speaker transmits the processed signal to the user. The adaptive filter also includes a detector connected to receive the processed signal which controls the gain of the system to prevent overcompression of the audio signal. The adaptive filter further includes an adaptive compression circuit utilizing multiple time constants to control the response time of the adaptive filter under various conditions.
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Bartingale Kari H.
Griswold Gary L.
Kirn Walter N.
Kuntz Curtis
Lee Ping W.
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