Directional/non-directional hearing aid

Details Directional/non-directional hearing aid Directional/non-directional hearing aid

1975-09-17

1976-08-17

Stellar, George G.

H04R 120, H04R 134, H04R 2500

Patent

active

039755991

ABSTRACT:
A hearing aid in which the sound reception characteristics are selectable by a user to provide a non-directional or directional reception, as desired. The hearing aid houses a differential transducer having two sound receiving ports communicating with front and rear sound receiving apertures through a network of sound conducting paths. Acoustic switching means are employed to selectably direct sound energy to the transducer through the sound conducting paths, which have equal acoustical impedance in either operating mode, and electric switching means may be associated with the acoustic switching means for adjusting the circuit gain to maintain substantially equal gain for both modes of operation. Frequency characteristics of the hearing aid response in both modes are matched so that switching from one mode to another does not materially alter the quality of sound received from the front of a user.

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