Electrical audio signal processing systems and devices – Sound effects – Reverberators
Patent
1987-10-20
1989-06-06
Ng, Jin F.
Electrical audio signal processing systems and devices
Sound effects
Reverberators
381 69, 381 71, 381 94, 381205, 381107, H04R 2500, H04R 2504, H03G 320, H03G 700
Patent
active
048378321
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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Hearing Instruments, Nov. 1987, p. 63, "Williams Sound Corporation ad".
"Fitting the Environment--Some Evolutionary Approaches" by E. Robert Libby and Robert Sweetow, PhD, Hearing Instruments, vol. 38, No. 8, 1987, pp. 8-16.
Byrd Danita R.
Ng Jin F.
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