Oscillation suppression
First Claim
1. A method for suppressing oscillation in a signal identified as or suspected of containing an oscillation, the method comprising the following steps:
- converting the signal into frequency bands in the frequency domain;
applying, for a selected period of time, a randomly changing phase to the signal in at least one of said frequency bands; and
reconverting the converted signal into an output waveform signal.
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Abstract
The invention relates to oscillation suppression and, more particularly, concerns a method and apparatus for suppressing oscillation in a signal identified as or suspected of containing an oscillation due to feedback.
The method involves converting the signal into frequency bands in the frequency domain, applying, for a selected period of time, a randomly changing phase to the signal in at least one of said frequency bands, and reconverting the converted signal into an output waveform signal. The selected period is divided into a series of successive time windows, and for each successive time window a newly generated random or pseudo-random phase is applied to the signal. The method can be used in combination with a method for detecting oscillation in said signal in each of the frequency bands, a randomly changing phase applied in each frequency band for which said oscillation has been detected.
The invention has particular application in hearing aid devices.
43 Citations
20 Claims
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1. A method for suppressing oscillation in a signal identified as or suspected of containing an oscillation, the method comprising the following steps:
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converting the signal into frequency bands in the frequency domain;
applying, for a selected period of time, a randomly changing phase to the signal in at least one of said frequency bands; and
reconverting the converted signal into an output waveform signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 18, 19, 20)
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11. An apparatus for suppressing oscillations in a signal identified as or suspected of containing an oscillation, comprising:
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means for converting the signal into frequency bands in the frequency domain;
means for applying, for a selected period of time, a randomly changing phase to the signal in at least one of said frequency bands; and
means for reconverting the converted signal into an output waveform signal. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification