Patent ID: 8094835

Claim:
A signal processing apparatus comprising: a first extracting unit configured to extract from an input audio signal a first frequency component having a first frequency band; a second extracting unit configured to extract from the input audio signal a second frequency component having a second frequency band; a first-harmonic-component generating unit configured to generate a first-harmonic-component signal including a third frequency component whose frequency is N1 times that of the first frequency component extracted in the first extracting unit; a second-harmonic-component generating unit configured to generate a second-harmonic-component signal including a fourth frequency component whose frequency is N2 times that of the second frequency component extracted in the second extracting unit; and a combining unit configured to combine the input audio signal, the first-harmonic-component signal, and the second-harmonic-component signal in a first predetermined ratio, wherein the first frequency band is higher than the second frequency band, and wherein N1 and N2 are positive integers, and N1 is smaller than N2.