INTERCOM DEVICE

摘要

An intercom device is provided, which has the capability of providing a howling prevention function over a wide frequency region with improved cost performance. This intercom device has a speaker unit, a first microphone spaced from the speaker unit by a first difference to mainly receive an audio output of the speaker unit, a second microphone spaced from the speaker unit by a second distance different from the first distance, and a signal processing unit for preventing the howling phenomenon. When the audio output of the speaker unit is picked up by the second microphone, the signal processing unit cancels a signal component corresponding to the audio output of the speaker unit from an output of the second microphone by using an output of the first microphone and a plurality of delay times, which are determined from a difference between the first distance and the second distance with respect to different frequencies of the audio output of said speaker unit.