Sound pitch converting apparatus

Details Sound pitch converting apparatus Sound pitch converting apparatus

1996-12-27

1999-01-19

Isen, Forester W.

Electrical audio signal processing systems and devices

Sound effects

704207, 84657, 381 98, H03G 300

Patent

active

058622322

ABSTRACT:
A sound pitch converting apparatus for shifting a pitch of a sound signal, the apparatus utilizes a first windowing device for dividing the sound signal into a series of multiple frames and shaping an envelope of the frames, a pitch frequency detecting device for detecting a pitch frequency within each frame, a Fourier transform device for transforming each frame signal into a frequency domain, a frequency shift device for shifting all frequency components in the Fourier transformed frame signal higher or lower by a desired degree, a harmonics level controlling device for controlling levels of harmonics contained in the frequency shifted frame signal responsive to a detected pitch frequency, an inverse Fourier transform device for transforming the harmonics level controlled frame signal back into a time domain, and a second windowing device for shaping an envelope of frame signal outputted from the inverse Fourier transform device and for combining the respective frames into a pitch changed sound signal.

REFERENCES:
patent: 5103431 (1992-04-01), Freeman et al.
patent: 5248845 (1993-09-01), Massie et al.
patent: 5285498 (1994-02-01), Johnston
patent: 5303346 (1994-04-01), Fessler et al.
patent: 5327521 (1994-07-01), Savil et al.

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