To mitigate the drop in the processing performance caused by clipping.

A synthesis block executes synthesis by replacing only a CL section having clipping of signals having a waveform 32 with a value obtained by adjusting a signal having a waveform 33 indicated by a thick line by using a difference between a first gain and a second gain. This difference between the first gain and the second gain is stored in the synthesis block in advance. That is, in the synthesis block, as shown with a dashed thick line, a synthesis signal is obtained which has a waveform 34 with the CL section in the waveform 32 replaced with a value obtained by increasing the waveform 33 by the difference between the first gain and the second gain. This disclosure is applicable, e.g., to a voice recognition system that recognizes a voice.