Electrical audio signal processing systems and devices – Hearing aids – electrical
Reexamination Certificate
2004-02-24
2008-03-04
Chin, Vivian (Department: 2615)
Electrical audio signal processing systems and devices
Hearing aids, electrical
C381S320000, C381S316000, C381S317000, C381S094100
Reexamination Certificate
active
07340072
ABSTRACT:
In a method and a device for the signal processing in a hearing aid, in which coefficients of a filter for the frequency-dependent amplitude adaptation of an input signal are adapted in accordance with this input signal, the following steps are carried out:Determining coefficients of a compression amplification gm, which describe a frequency-dependent adaptation of the input signal in accordance with frequency-dependent signal levels of the input signal,determining coefficients of a noise suppression am, which describe a frequency-dependent adaptation of the input signal in accordance with interference noises detected in the input signal, andthe calculation of the coefficients of the filter (6) cmout of the coefficients of the compression amplification gmand the coefficients amof the noise suppression.In this, only a single controllable filter is utilised both for the compression amplification as well as for the noise suppression, and a delay time for the filtering of the input signal is kept short.
REFERENCES:
patent: 6580798 (2003-06-01), Schaub
patent: 2002/0057814 (2002-05-01), Kaulberg
patent: 2002/0094100 (2002-07-01), Kates et al.
Bernafon AG
Chin Vivian
Tran Con P.
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