Richard Douglas Goode

61012580, Aug 8, 2000

Oct 21, 1997

8/955271

Mead Killion - Elk Grove Village IL
Fred Waldhauer - late of La Honda CA
Johannes Wittkowski - Schackendorf, DE
Richard Goode - Los Altos CA
Jont Allen - Mountainside NJ

Etymotic Research, Inc. - Elk Grove Village IL

H04R 2500

381321

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.

55240569, Jun 4, 1996

Apr 13, 1993

8/046241

Mead Killion - Elk Grove Village IL
Fred Waldhauer - late of La Honda CA
Johannes Wittkowski - Schackendorf, DE
Richard Goode - Los Altos CA
Jont Allen - Mountainside NJ

Etymotic Research, Inc. - Elk Grove Village IL

H04R 2500

381 682

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.

63273705, Dec 4, 2001

Jul 24, 2000

9/624805

Mead Killion - Elk Grove Village IL
Fred Waldhauer - late of La Honda CA
Johannes Wittkowski - Schackendorf, DE
Richard Goode - Los Altos CA
Jont Allen - Mountainside NJ

Etymotic Research, Inc. - Elk Grove IL

H04R 2500

381313

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.