Feedback compensation method and circuit for an acoustic amplification system, and hearing aid device employing same
First Claim
1. A feedback compensator for use in an acoustic amplification system to compensate feedback that acts on an input signal, upon amplification of said input signal, due to a feedback path from an amplified output signal, said feedback compensator comprising:
- an adaptive feedback compensation filter that generates a compensation signal, from said amplified output signal, for compensating said feedback, said compensation signal being combined with said input signal; and
a frequency-limiting filter connected relative to said adaptive feedback compensation filter to limit a frequency range within which said adaptive feedback compensation filter compensates said feedback, said frequency-limiting filter having a filter function that is adaptable during compensation of said feedback by said adaptive feedback compensation filter.
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Abstract
In a feedback compensation method and a feedback compensator in an acoustic amplification system such as a hearing aid, an adaptive feedback compensation filter generates a compensation signal from the amplified output signal, and one or more filters restrict the frequency range in which the compensation signal is generated. These filters are adaptable with regard to their filter function during the operation of the feedback compensator. The adaptation ensues with an analysis and control unit that checks the frequency range affected by the feedback and adapts the filter functions of the filters to it. The checking ensues, for example, by a comparison of the filter function of the feedback compensation filter with the filter functions of the filters to restrict the frequency range, or with the use of an oscillation detector.
24 Citations
69 Claims
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1. A feedback compensator for use in an acoustic amplification system to compensate feedback that acts on an input signal, upon amplification of said input signal, due to a feedback path from an amplified output signal, said feedback compensator comprising:
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an adaptive feedback compensation filter that generates a compensation signal, from said amplified output signal, for compensating said feedback, said compensation signal being combined with said input signal; and
a frequency-limiting filter connected relative to said adaptive feedback compensation filter to limit a frequency range within which said adaptive feedback compensation filter compensates said feedback, said frequency-limiting filter having a filter function that is adaptable during compensation of said feedback by said adaptive feedback compensation filter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. A hearing aid comprising:
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an input transducer that produces an input signal from an incoming acoustic signal;
a hearing aid signal processor supplied with said input signal that amplifies said input signal to produce an amplified output signal, said input signal being influenced by feedback, via a feedback path, upon amplification thereof;
an adaptive feedback compensation filter that generates a compensation signal, from said amplified output signal, for compensating said feedback, said compensation signal being combined with said input signal; and
a frequency-limiting filter connected relative to said adaptive feedback compensation filter that limits a frequency range within which said adaptive feedback compensation filter compensates said feedback, said frequency-limiting filter having a filter function that is adaptable during compensation of said feedback by said adaptive feedback compensation filter.
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36. A method for compensating feedback in an acoustic amplification system, said feedback acting on an input signal, upon amplification of said input signal, due to a feedback path from an amplified output signal, said method comprising the steps of:
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generating a compensation signal in an adaptive feedback compensation filter from said amplified output signal, for compensating said feedback, and combining said compensation signal with said input signal; and
limiting a frequency range within which said adaptive feedback compensation filter compensates said feedback with a frequency-limiting filter connected relative to said adaptive feedback compensation, and adapting a filter function of said frequency-limiting filter during compensation of said feedback by said adaptive feedback compensation filter. - View Dependent Claims (37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69)
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Specification