Patent ID: 8565456

Claim:
A hearing aid, comprising: a microphone that acquires sound in the front direction of the face of the user in a state of being worn by the user; an external input terminal that acquires input sound inputted from an external device; a hearing aid processor that receives sound signals outputted from the microphone and the external input terminal, and subjects the sound signals to hearing aid processing; a receiver that receives and outputs a sound signal that has undergone hearing aid processing at the hearing aid processor; a mixer that mixes a sound signal inputted to the microphone with a sound signal inputted to the external input terminal, and outputs a sound signal to the receiver; a similarity calculator that calculates a correlation between a sound signal inputted from the microphone and a sound signal inputted from the external input terminal; and a mixing ratio decider that decides a mixing ratio between the sound signal inputted to the microphone and the sound signal inputted to the external input terminal at the mixer, on the basis of the calculation result of the similarity calculator, and sends the result to the mixer, wherein when it is detected by the similarity calculator that the correlation is high, the mixing ratio decider decides the mixing ratio so as to lower the priority of the sound signal inputted from the microphone below that of the sound signal inputted from the external input terminal.