Dynamic compression in a hearing aid

Patent 7305100 Issued on December 4, 2007. Estimated Expiration Date:

February 13, 2024. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

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6198830

Inventor

Pedersen, Brian Dam

Assignee

GN ReSound A/S

Application

No. 10778653 filed on 02/13/2004

US Classes:

381/320, Spectral control381/321, Wideband gain control381/106, With amplitude compression/expansion708/301, Tapped delay line381/103, Having automatic equalizer circuit381/315, Remote control, wireless, or alarm704/203, Transformation381/370, Headphone381/312, HEARING AIDS, ELECTRICAL381/316, Frequency transposition381/314Programming interface circuitry

Examiners

Primary: Swerdlow, Daniel

Attorney, Agent or Firm

Bingham McCutchen LLP

Foreign Patent References

2 350956 GB 12/01/2000
5243910 JP 09/01/1993
WO 98/56210 WO 12/01/1998

International Class

H04R 25/00

Abstract

The present invention relates to a hearing aid with a compressor having a low and gain independent delay and low power consumption. The hearing aid comprises a multi-channel compressor for compensation of dynamic range loss and with a digital input for inputting a digital sound signal, and an output connected to an amplifier with a selectable gain as a function of frequency for compensation of frequency dependent hearing loss, and connected to an output for outputting the processed digital sound signal.

Other References

Koilpillai, R.D.; Vaidyanathan, P.P.; New results on cosine-modulated FIR filter banks satisfying perfect reconstruction; Acoustics, Speech, and Signal Processing, 1991. ICASSP-91., 1991 International Conference on Apr. 14-17, 1991 pp. 1793-1796 vol. 3.
Harma, Aki et al.; Frequency-warped signal processing for audio applications; J. Audio Eng. Soc. vol. 48, No. 11, Nov. 2000, pp. 1011-1031.