Patent ID: 8301279

Claim:
A signal processing apparatus that analyzes an audio signal, comprising: first extracting means for extracting a high-frequency signal containing the higher frequencies from an input audio signal; second extracting means for extracting a low-frequency signal containing the lower frequencies from an input audio signal; high-frequency processing means for analyzing the plurality of pitch components contained in the high-frequency signal that was extracted from the audio signal, wherein the high-frequency signal is divided into a plurality of partially overlapping frames, the analysis being conducted using the short-time Fourier transform to apply a window function to each of the high-frequency signal frames and to apply a fast Fourier transform to each of the high-frequency signal frames for the analysis of the plurality of pitch components; low-frequency processing means for analyzing the plurality of pitch components contained in the low-frequency signal that was extracted from the audio signal, the analysis being conducted by first dividing the low-frequency signal into a plurality of octave components and then respectively extracting a plurality of pitch components from each octave component; and synthesizing means for combining the plurality of pitch components contained in the analyzed high-frequency signal with the plurality of pitch components contained in the analyzed low-frequency signal.