Howling suppression device, a hearing aid, howling suppression method, and an integrated circuit

摘要

Howling suppression apparatus includes a subtractor for subtracting the pseudo feedback signal from the input signal (102), and the adaptive filter (107) for generating a pseudo-feedback signal for the next input signal, the filter coefficients of the adaptive filter (107) with the coefficient update control unit for controlling the update speed and (108), the coefficient update control unit (108), a level calculator for calculating the signal level of the input signal, an increase amount per unit time of the signal level of the input signal There the signal rising edge detection unit for detecting a rising edge position above a threshold, from the rising position, the afterglow period detector the signal level of the input signal to detect an afterglow period of up to a position deviated gradually narrowing the predetermined range over time If, sets the update rate in the afterglow period the first speed, and a updating speed control unit for setting the update rate in the interval other than the afterglow period the second speed than the first speed, the adaptive filter (107 ) is, it will update at a set update rate of the filter coefficient update speed control unit.