H - Electricity – 04 – R
Patent
H - Electricity
04
R
H04R 25/00 (2006.01) G10L 21/02 (2006.01) H03F 1/00 (2006.01) H03G 7/06 (2006.01) H04B 3/21 (2006.01) H04B 15/00 (2006.01) G10L 21/00 (2006.01)
Patent
CA 2406754
A hearing aid includes noise reduction, and addresses the problem that, in noisy conditions, it is difficult for hearing impaired individuals to hear. Under light noise conditions, conventional hearing aids amplify the input signal sufficiency to overcome the hearing loss. For a typical sloping hearing loss where there is a loss in high frequency hearing sensitivity, the amount of boost (or gain) rises with frequency. Most frequently, the loss in sensitivity is only for low-level signals; high level signals are affective minimally or not al all. A compression hearing aid is able to compensate by automatically lowering the gain as the input signal level rises. This compression action is usually comprised under noisy conditions. In general, hearing aids are of lesser benefit under noisy conditions since both noise and speech are boosted together when what is really required is a reduction of the noise relative to the speech. A noise reduction algorithm with the dual purpose of enhancing speech relative to noise and also providing a relatively clean signal for the compression circuitry is described.
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
Dspfactory Ltd.
Emma Mixed Signal C.v.
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