Electrical audio signal processing systems and devices – Sound effects – Reverberators
Patent
1997-09-02
1999-09-07
Kuntz, Curtis A.
Electrical audio signal processing systems and devices
Sound effects
Reverberators
381313, 381315, 381328, H04R 2500
Patent
active
059498897
ABSTRACT:
A directional hearing aid comprising a slave microphone for the right ear d a master microphone for the left ear, each of which receive audio information from an external source. The output signal from the master and slave microphones are each provided to fifty hertz bandwidth filters each of which has a center frequency selected from the middle range frequency of the human voice. The output signal from the slave microphone is provided to a modulator which then provides a sixty kilo-hertz frequency modulated carrier signal. The carrier signal is transmitted through the head of the user to a receiver, demodulated and then supplied to a phase comparator. The phase comparator compares the phase of the signals from the master and slave microphones and then provides phase comparison data to a computer. The computer processes the data generating command signals which are supplied to a pair of broad band audio amplifiers. One of the audio amplifiers amplifies the output signal from the slave microphone, while the other audio amplifier amplifies the output signal from the master microphone. The user of the directional hearing aid turns his head toward the direction of the sound until the intensity of the amplified signal provided to each ear is identical, which indicates to the user that his head is aligned with the direction of the incoming sound.
REFERENCES:
patent: 3836732 (1974-09-01), Johanson
patent: 3876843 (1975-04-01), Moon
patent: 3946168 (1976-03-01), Preves
patent: 4051330 (1977-09-01), Cole
patent: 4447677 (1984-05-01), Miyahra
patent: 4751738 (1988-06-01), Widrow
Harvey Dionne
Kalmbaugh David S.
Kuntz Curtis A.
The United States of America as represented by the Secretary of
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