Patent ID: 8108011

Claim:
A signal correction device comprising: an orthogonal transform section configured to perform an orthogonal transform for an input signal, the input signal including speech as a target signal and an unnecessary non-target signal other than the speech; an interval determining section configured to determine whether each frame of the input signal is an interval in which the non-target signal is dominantly included to classify the frame into being the interval or not being the interval; a suppressing gain calculating section configured to calculate suppressing gain for suppressing the non-target signal for each first frequency bandwidth at a first frequency resolution for a frame determined to be the interval, and to calculate suppressing gain for suppressing the non-target signal for each second frequency bandwidth at a second frequency resolution for a frame determined not to be the interval, the second frequency resolution being higher than the first frequency resolution; and a signal correcting section configured to perform a signal correcting process for suppressing the non-target signal for a transform coefficient that is acquired by the orthogonal transform section by using the suppressing gain that is calculated by the suppressing gain calculating section.