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

摘要

Howling suppression apparatus includes a subtractor for generating an error signal (102), and the adaptive filter (107) for applying filtering to the error signal, the coefficient for controlling the update speed of the filter coefficient of the adaptive filter (107) update control unit (108) and comprises a coefficient update control unit (108) includes a convergent analysis unit the degree of convergence with respect to the spatial transfer characteristic of the filter characteristics to determine whether the first condition is satisfied or not that exceeds the reference value, the convergence a change amount analyzing section for determining whether a second condition is satisfied or not that is ahead, the update rate if it meets both of the two conditions is set to first speed, when it is not satisfied at least one of and a updating speed control unit for setting the update rate to a second rate, the adaptive filter (107) is updated at the set update rate of the filter coefficient update speed controller.