Importance

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Abstract

A behind-the-ear type hearing aid which includes a main body adapted to hang on the user's earlobe on the rear side, an opening disposed at the front end of the main body to communicate with a microphone used for normal conversation, and a pair openings disposed on its rear end portion to communicate with a closed talking microphone for use with telephone conversations disposed in the main body. The close talking microphone may be connected to a low-pass filter with a cutoff frequency of about 1,000 hertz. The close talking microphone may also include two pressure type microphones which are substantially identical in sensitivity and are disposed adjacent to each other. One of those microphones has an output connected to that of the other microphone through a phase inverter with or without a gain control connected across the phase inverter.

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First Claim