Electrical audio signal processing systems and devices – Sound effects – Reverberators
Patent
1993-04-13
1996-06-04
Chan, Wing F.
Electrical audio signal processing systems and devices
Sound effects
Reverberators
381 68, 381 681, H04R 2500
Patent
active
055240569
ABSTRACT:
A hearing aid apparatus is disclosed that employs both an omnidirectional microphone and at least one directional microphone of at least the first order. The electrical signals output from the directional microphone are supplied to an equalization amplifier which at least partially equalizes the amplitude of the low frequency electrical signal components of the electrical signal with the amplitude of the mid and high frequency electrical signal components of the electrical signals of the directional microphone. A switching circuit accepts the signals output from both the omnidirectional microphone and the directional microphone. The switching circuit connects the signal from the omnidirectional microphone to an input of a hearing aid amplifier when the switching circuit is in a first switching state, and connects the output of the equalization circuit to the hearing aid amplifier input when the switching circuit is in a second switching state. The switching circuit may be automatically switched in response to sensed ambient noise levels.
REFERENCES:
patent: 2950357 (1960-08-01), Mitchell et al.
patent: 3983336 (1976-09-01), Malek et al.
patent: 4073366 (1978-02-01), Estes
patent: 5214709 (1993-05-01), Ribic
"Suggestions for Utilization of the Knowles Electronics EL-1687, BT-1784 and BT-1788 Directional Microphones".
Ora Buerkli-Halevy, MA--The directional microphone advantage--Aug. 1987/Cleveland, OH.
Allen Jont
Goode Richard
Killion Mead
Waldhauer, deceased Fred
Wittkowski Johannes
Chan Wing F.
Etymotic Research Inc.
Le Huyen D.
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