Pitch control system

Details Pitch control system Pitch control system

1992-07-23

1994-11-29

Knepper, David D.

395 274, G10L 302

Patent

active

053697251

ABSTRACT:
A system for controlling the pitch between an original sound and a reproduced sound system in which generation of tremolo sound is suppressed and a clock is used commonly for write timing and read timing of a ring buffer. Digital data are obtained by sampling an analog input signal and data are interpolated before writing to a memory of the ring buffer, and a plurality of write positions are provided and the data is written while controlling addresses. Address spacings between a plurality of read memory positions are different from each other. Coefficients are set within a range from a predetermined negative value to a predetermined positive values according to address spacing to write memory position for each of the read memory positions, and the data read from each of a plurality of read memory positions are multiplied by the corresponding coefficient. The resultant data values are summed up and are used as output data. Further, a comb line filter is provided in a signal path.

REFERENCES:
patent: 4121058 (1978-10-01), Jusko et al.
patent: 4586191 (1986-04-01), Nishimura
patent: 4700391 (1987-10-01), Leslie, Jr. et al.
patent: 4907277 (1970-03-01), Callens et al.
patent: 5131042 (1992-07-01), Oda

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