Tone signal processing device having digital filter characterist

Details Tone signal processing device having digital filter characterist Tone signal processing device having digital filter characterist

1992-02-26

1994-01-04

Witkowski, Stanley J.

Music

Instruments

Electrical musical tone generation

84DIG9, G10H 112

Patent

active

052762750

ABSTRACT:
Timewise change of filter characteristics is realized by interpolating filter coefficients to be applied to a digital filter circuit with a function of time. Scaling parameters are generated in correspondence to the tone pitch of a tone signal applied to the digital filter circuit and a time function in the interpolation operation is variably controlled in accordance with the scaling parameters. The inclination of timewise change of filter coefficients obtained by the interpolation is thereby variably controlled and, as a result, the rate of change of the filter coefficients, i.e., the rate of timewise change of filter characteristics realized thereby, is variably controlled in accordance with tone color.

REFERENCES:
patent: 4738179 (1988-04-01), Suzuki
patent: 4907484 (1990-03-01), Suzuki et al.
patent: 5173567 (1992-12-01), Fujita

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