Interpolating tone wave generator having truncated data

Details Interpolating tone wave generator having truncated data Interpolating tone wave generator having truncated data

1991-06-10

1992-09-15

Witkowski, Stanley J.

Music

Instruments

Electrical musical tone generation

364723, G10H 712

Patent

active

051468344

ABSTRACT:
A tone generating apparatus comprises a wave memory, an address calculator, an interpolating circuit. In the wave memory is stored tone wave data of a single period to be repeatedly read out stored between a loop top address (integer address) and an address preceding by "1" a loop end address (integer address), same tone wave data as stored at the loop top address being stored at the loop end address. The address calculator generates a read address including a fraction portion, which sequentially increases from the loop top address of the wave memory toward the loop end address at an interval corresponding to a pitch, and returns to the loop top address when exceeding the loop end address. When the read address generated by the address calculator includes a significant fraction portion, the interpolating circuit prepares tone wave data acquired by proportional distribution of tone wave data, read out from the wave memory with an integer portion of the read address used as an address, and tone wave data, read out from the wave memory with a value acquired by adding "1" to the integer portion of the read address used as an address, using the fraction portion. Musical tones are generated on the basis of the tone wave data prepared by the interpolating circuit.

REFERENCES:
patent: 3763364 (1973-10-01), Deutsch et al.
patent: 4646608 (1987-03-01), Deutsch

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