SIGNAL PROCESSING CIRCUIT, METHOD OF PROCESSING SIGNAL, AUDIO SIGNAL PROCESSING CIRCUIT, METHOD OF PROCESSING AUDIO SIGNAL, IMAGING APPARATUS, METHOD OF PROCESSING AUDIO SIGNAL WITH IMAGING APPARATUS, RECORDING APPARATUS, METHOD OF RECORDING, PLAYING APPARATUS, AND METHOD OF PLAYING

摘要

A signal processing circuit, a signal processing method, a voice signal processing circuit, a voice signal processing method, an image pickup device, a voice signal processing method of the image pickup device, a recording apparatus, a recording method, a reproducing apparatus, and a reproducing method are provided to reduce a periodic noise in response to the change of a period of the periodic noise. A voice input signal(S+N) is inputted to a synchronous-type adaptive filter(20) and a frequency adaptive comb filter(10). Each of the synchronous-type adaptive filter(20) and the frequency adaptive comb filter(10) removes a periodic noise on the basis of period information(X). When an input terminal(30a) of a selector(30) is selected and it is impossible for the synchronous-type adaptive filter(20) to remove the periodic noise, an input terminal(30b) is selected and the periodic noise is removed by the frequency adaptive comb filter(10).