Howling suppression device, hearing aid, howling suppression method, and integrated circuit
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United States of America Patent
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Sep 1, 2015
Grant Date -
Oct 17, 2013
app pub date -
Jul 30, 2012
filing date -
Oct 14, 2011
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Abstract
A howling suppression device includes a subtractor which subtracts a pseudo feedback signal from an input signal; an adaptive filter which produces a pseudo feedback signal for a next input signal; and a coefficient update control unit which controls an update rate of a filter coefficient of the adaptive filter and includes: a level calculation unit which calculates a signal level of the input signal; a signal-rising-edge detection unit which detects a rising-edge point; a reverberation section detection unit which detects a reverberation section; and an update rate control unit which sets the update rate to a first rate in the reverberation section and to a second rate in other sections. The adaptive filter updates the filter coefficient at the update rate set by the update rate control unit.
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