Tone signal generation device employing a digital filter

Details Tone signal generation device employing a digital filter Tone signal generation device employing a digital filter

1989-08-14

1993-10-05

Witkowski, Stanley J.

Music

Instruments

Electrical musical tone generation

84DIG9, 36472401, G10H 112

Patent

active

052507483

ABSTRACT:
An address signal generation circuit generates an address signal which changes at a rate corresponding to tone pitch of a tone to be generated. This address signal consists of an integer section and a decimal section. A tone waveshape data generation circuit generates tone waveshape sampled data in response to the integer section of the address signal. A filter coefficient supply circuit can generate data corresponding to filter coefficients of m orders and selects and supplies n filter coefficients (where n<m) in response to the decimal section of the address signal. In a relation n=m/d, for example, the filter coefficient supply circuit selects filter coefficients corresponding to n orders which are distant sequentially with an interval of d in response to the value of the decimal section of current address signal. A digital filter operation circuit performs filter operations of m orders with respect to tone waveshape data of n sample points by using these n filter coefficient data and tone waveshape data of n sample points generated by the tone waveshape data generation circuit. By this arrangement, despite that the actual filter operation is carried out only with respect to data corresponding to the n orders, a filter operation equivalent to performing filter operations of m orders can be realized.

REFERENCES:
patent: 4416179 (1983-11-01), Wachi
patent: 4419919 (1983-12-01), Kashio
patent: 4548119 (1985-10-01), Wachi et al.
patent: 4554858 (1985-11-01), Wachi et al.
patent: 4679480 (1987-07-01), Suzuki
patent: 4701956 (1987-10-01), Katoh
patent: 4738179 (1988-04-01), Suzuki

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