Patent ID: 9357315
Filing Date: 2016-05-31
CPC Classification: H04R

Claim Text:
1. A hearing aid, comprising: a microphone configured to convert sound into an electric signal; a hearing aid processing unit including a gain setting unit configured to provide a gain to a first signal generated based on an output signal from the microphone to generate a second signal; a receiver configured to convert the second signal into sound; a feedback removal unit including an adaptive filter configured to adaptively estimate a transfer function corresponding to a pathway from an input side of the receiver to an output side of the microphone through transmission of the sound, a coefficient update unit configured to update a filter coefficient of the adaptive filter based on the first signal and the second signal and a subtraction unit configured to subtract a third signal generated based on the transfer function from the output signal of the microphone to obtain a signal and output the signal as the first signal; and a control unit configured to control at least the gain setting unit and an adaptive speed of the adaptive filter, wherein the coefficient update unit updates the filter coefficient based on an amount of updating normalized by power of input, and the control unit sets a smaller gain than a gain under normal operation to the gain setting unit until a first time has elapsed since immediately after power-on and sets a higher adaptive speed than an adaptive speed under normal operation to the adaptive filter until a second time has elapsed since immediately after the power-on.