Electrical audio signal processing systems and devices – Including amplitude or volume control – With amplitude compression/expansion
Patent
1988-02-23
1989-11-21
Chin, Tommy P.
Electrical audio signal processing systems and devices
Including amplitude or volume control
With amplitude compression/expansion
455 72, H04R 2900, H04B 164
Patent
active
048827622
ABSTRACT:
A programmable low voltage multi-band compression system suitable for use with hearing aids is described. Received audio signals are processed by a band split filter which separates the received audio signal into a plurality of frequency bands. A plurality of compressors coupled to the band split filter compresses each of the respective frequency bands. The output of the compressor are then summed to generate a composite audio signal. The compression ratio of each of the compressors is set, in response to a set of control signals, to a preselected independent value. The average gain of each of the compressors is set to a preselected level independently of the other compressors. In addition, the compression ratio of each compressor may vary with input signal level. Another set of control signals is employed for setting the gain of the compressor to provide a volume control function.
REFERENCES:
patent: 3784750 (1974-01-01), Stearns
patent: 4068092 (1978-01-01), Ikoma
patent: 4253072 (1981-02-01), Fisher
patent: 4696044 (1987-09-01), Waller
Signal Processing to Improve Speech Intelligibility in Perceptive Deafness, by Edgar Villchur, The Journal of the Acoustical Society of America, pp. 1646-1657, vol. 53, No. 6, 1973.
Widlar R. T., "A New Breed of Linear IC's Runs at 1 Volt Levels", Electronics, Mar. 29, 1979, p. 115.
Dillon H., and Walker G., "Compression in Hearing Aids", An Analysis, A Review and Some Recommendations, National Acoustic Laboratories, Commonwealth Dept. of Health Rpt., No. 90, Jun. 1982.
Chin Tommy P.
ReSound Corporation
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