Dereverberation device and hearing aid

A hearing aid comprising:

• a microphone configured to convert sound into an electric signal;
• a receiver configured to convert an electric signal into sound;
• an input instantaneous value calculation unit configured to calculate an input instantaneous value based on an input signal extracted from an output signal from the microphone;
• a reverberation estimation unit configured to calculate a moving average of the input instantaneous value as a reverberation component;
• a gain calculation unit configured to calculate, with the input instantaneous value and the reverberation component, a first gain as a basic gain for the input signal;
• a gain suppression control unit configured to calculate, according to a ratio between the input instantaneous value and the reverberation component, a second gain changing within a range between a predetermined lower limit and a predetermined upper limit, thereby outputting a larger one of the first gain or the second gain as a third gain;
• and
• a hearing aid processing unit configured to perform hearing aid processing according to a user for the input signal and including a gain processing unit configured to multiply the input signal by the third gain.