Method and apparatus for adjusting the pitch and timbre of an in

Details Method and apparatus for adjusting the pitch and timbre of an in Method and apparatus for adjusting the pitch and timbre of an in

1998-07-28

1999-10-19

Witkowski, Stanley J.

Music

Instruments

Electrical musical tone generation

84660, G10H 106

Patent

active

059692820

ABSTRACT:
A system and method are disclosed for independently adjusting the pitch and timbre of an input signal within a modified Lent shifter. A method of adjusting the pitch and timbre of an input signal includes receiving an input signal and determining a window length corresponding to the input signal. A finite length spectrally smoothed signal is created from the input signal by synchronously windowing the input signal. The timbre of the finite length spectrally smoothed signal is adjusted thereby creating a finite length timbre adjusted signal. The finite length timbre adjusted signal is recombined at a rate necessary to produce a desired output pitch thereby reducing artifacts introduced by processing the finite length timbre adjusted signal and minimizing latency between receiving the input signal and producing a desired output signal.

REFERENCES:
patent: 4282790 (1981-08-01), Wachi
patent: 4351219 (1982-09-01), Bass
patent: 4418600 (1983-12-01), Wachi
patent: 4440058 (1984-04-01), Bass et al.
patent: 4597318 (1986-07-01), Nikaido et al.
patent: 5231671 (1993-07-01), Gibson et al.
Lent, Keith "An Efficient Method for Pitch Shifting Digitally Sampled Sounds" Computer Music Journal, University of Texas v. 13, No. 4, (1989) pp. 65-71.

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