Patent ID: 7394908

Claim:
An audio-signal-processing apparatus for processing input-audio-signals, each input-audio-signal comprising a musical sound that includes a fundamental-tone having a first frequency, and a harmonic-tone having a second frequency that is an integral multiple frequency of the first frequency, said apparatus comprising: a band-decomposition unit operable to decompose a low frequency component of the input-audio-signals into a first frequency band and a second frequency band, the first frequency band and the second frequency band being different frequency bands, and the fundamental-tone being included in the first frequency band and the harmonic-tone being included in the second frequency band; a harmonic-series-generating unit operable to generate a harmonic-tone component for the fundamental-tone included in the first frequency band, and a harmonic-tone component for the harmonic-tone included in the second frequency band; and a composition unit operable to compound the input-audio-signals, the harmonic-tone component for the fundamental-tone in the first frequency band, and the harmonic-tone component for the harmonic-tone included in the second frequency band generated by said harmonic-series-generating unit, wherein a bandwidth of the first frequency band and a bandwidth of the second frequency band are defined based on at least one of a lowest fundamental frequency of the musical sound and a low interval limit.