Patent ID: 8249273

Claim:
A sound input device, comprising: a differential microphone configured to receive sound including noise and generate a first signal in accordance with the sound; a detector configured to detect the noise and generate a second signal in accordance with the detected noise; and a controller configured to control at least one of suppression of high-frequency components of the first signal and changing of a frequency band to be suppressed of the first signal based on the second signal, wherein the differential microphone includes: a first microphone having a first vibrating membrane; a second microphone having a second vibrating membrane; and a differential signal generator configured to generate a differential signal indicative of a difference between a first voltage signal acquired by the first microphone and a second voltage signal acquired by the said second microphone, and the detector includes: a first unit, configured to give a delay for noise detection to the second voltage signal; and a second unit, configured to generate the second signal based on a difference between the second voltage signal given the delay by the first unit and the first voltage signal.