Abstract
Electronic circuitry is described which enhances the intelligibility of a speech signal corrupted by low-frequency noise and certain flaws of miniaturized hearing aids are overcome by packaging the circuitry in a housing to be worn on the body of the hearing-impaired person and electrically coupling the output of the circuit to a high quality of a type to be worn in the ear speaker. The circuitry includes a low-frequency channel which passes components of the speech signal between about 600 Hz and about 1.2 KHz, and a parallel high-frequency channel which passes speech signal components between about 1.7 KHz and 4.6 KHz. The high-frequency channel includes a gain control amplifier for compressing the dynamic range of high-frequency components and means for adjusting the level of the compressed high-frequency signal relative to the level of signals passed by the low-frequency channel. The low-frequency and high-frequency signals are combined in a summing amplifier, the output level of which is controlled by a volume control and then amplified in power sufficiently to drive a wide dynamic range external speaker.
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