Hearing aid

Details Hearing aid Hearing aid

1991-01-23

1993-10-19

Ng, Jin F.

Electrical audio signal processing systems and devices

Sound effects

Reverberators

381 682, 381108, H04R 2500

Patent

active

052553205

ABSTRACT:
A single-channel circuit for a hearing aid for persons with an impaired hearing faculty has a pre-amplifier and an output amplifier, a microphone and an earphone, as well as a full-wave rectifier circuit for producing a control voltage for a voltage-dependent attenuator connected to the pre-amplifier. In order to allow a favorable speech audibility characteristic over the entire amplification range, a voltage-controlled filter is provided for a single-dependent change in the frequency response. The control input of the filter is connected to the rectifier circuit. The filter is connected to the rectifier circuit via a time function element.

REFERENCES:
patent: 3571529 (1971-03-01), Gharib
patent: 3818149 (1974-06-01), Stearns et al.
patent: 4790018 (1988-12-01), Preves et al.
patent: 4792977 (1988-12-01), Anderson
"Hearing well in noise with VASM", Viennatone automatic signal management, Apr. 24, 1992.

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