Hearing device with feedback-reduction filters operated in parallel, and method

1. A hearing device, comprising:

a signal-processing apparatus for processing an input signal into an output signal; and

a feedback-canceller apparatus for reducing feedback artifacts on a basis of the input signal and the output signal, said feedback-canceller apparatus having an adaptive, first filter, for establishing a set of filter coefficients for a predefined feedback situation, said the feedback-canceller apparatus configured to store the set of filter coefficients, said feedback-canceller apparatus having at least one second filter, being operated directly parallel to said adaptive, first filter on a basis of the stored set of filter coefficients, said adaptive, first filter being continuously adapted to a current feedback situation, and said feedback-canceller apparatus configured such that in the current feedback situation said feedback-canceller apparatus automatically selects either said adaptive, first filter or said second filter, wherein the set of filter coefficients in said feedback-canceller apparatus can automatically be overwritten by a new set of filter coefficients if the new set of filter coefficients was selected more frequently than an old set of filter coefficients.

2. The hearing device according to claim 1 , wherein said adaptive, first filter is a finite impulse response filter and said second filter is an infinite impulse response filter.

3. The hearing device according to claim 1 , wherein said first and second filters that are part of said feedback-canceller apparatus and can be operated in parallel are finite impulse response filters.

4. The hearing device according to claim 1 , wherein said feedback-canceller apparatus has a comparator, by means of which one of said first and second filters being operated in parallel can be selected automatically.

5. The hearing device according to claim 4 , wherein said feedback-canceller apparatus has a measuring unit for measuring signal energy of the output signal of each of said first and second filters, and the signal energies are fed to said comparator for purposes of a decision.

6. The hearing device according to claim 1 , wherein a plurality of sets of filter coefficients can be stored in said feedback-canceller apparatus and said second filter can be operated on a basis of one of the plurality of sets of filter coefficients.

7. A method for compensating for feedback in a hearing device, which comprises the steps of:

processing an input signal into an output signal;

reducing feedback artifacts on a basis of the input signal and the output signal;

providing an adaptive, first filter, by means of which a set of filter coefficients is established for a predefined feedback situation;

storing the set of filter coefficients in the hearing device;

providing at least one second filter being operated directly parallel to the adaptive, first filter on a basis of a stored set of filter coefficients;

adapting continuously the adaptive, first filter to a current feedback situation;

automatically selecting either the first or the second filter for reducing the feedback in the current feedback situation; and

automatically overwriting the set of filter coefficients with a new set of filter coefficients if the new set of filter coefficients was selected more frequently than an old set of filter coefficients.

8. The method according to claim 7 , which further comprises storing the set of filter coefficients if the respective feedback situation is constant over at least one predefined amount of time.

9. The method according to claim 7 , which further comprises storing the set of filter coefficients if an associated feedback situation occurs with a predefined minimum frequency.