SIGNAL PROCESSING APPARATUS, SIGNAL PROCESSING METHOD, AND PROGRAM

PROBLEM TO BE SOLVED: To allow a processing amount to be reduced even when there is a constraint on an arrangement of an audio signal as a processing target in a case in which the audio signal is decompressed or compressed through a time axis domain process.SOLUTION: A processing buffer unit stores an audio signal. A pitch calculation unit and a pitch cycle correction unit calculate a multiple of N as the number of samples in a pitch cycle of the audio signal, in which N is an integer equal to or greater than 1. A processing control unit and a start-position movement amount correction unit sequentially determine, as a sample in a start position of a compression process in a time axis domain of the audio signal, a (multiple of N)-th sample from a start position immediately before the start position. An operation unit compresses samples in a predetermined number times the pitch cycle from the sample in the start position of the audio signal in a time axis domain, and sets the number of samples of the audio signal after the compression to be the multiple of N. The present technology, for example, may be applied to an audio signal processing apparatus.