Tone source circuit for electronic musical instruments

Details Tone source circuit for electronic musical instruments Tone source circuit for electronic musical instruments

1980-02-13

1982-07-13

Witkowski, S. J.

Music

Instruments

84 122, 84 123, G10H 108, G10H 506

Patent

active

043388442

ABSTRACT:
A tone source circuit for electronic musical instruments, in which a unit phase coefficient corresponding to a note code required by a key depression is read out from a phase coefficient memory of a tone generating part for each time division channel; the unit phase coefficient is applied to an accumulator composed of an adder and an accumulated value storage register to obtain an accumulated value for each time division channel. A demultiplexer for taking out higher order bits of the accumulated value and supplying them as a sampled rectangular wave signal to a filter provided corresponding to each key, the filter eliminates a sampling pulse component from the sampled rectangular wave, and a mixing circuit then mixes the output from the filters. It is also possible to take out predetermined bits of the accumulated value, store them in a latch circuit for each time division channel and frequency divide the output signal from the latch circuit by a predetermined frequency divider group, providing the frequency divided output as the tone source signal. Also, it is possible to input a rectangular wave sampled pulse signal of a 50% duty ratio from higher order digits of a tone source circuit of an electronic musical instrument to a duty ratio converter composed of AND circuits to output therefrom rectangular wave sampled pulse signals of various duty ratios.

REFERENCES:
patent: 3610799 (1971-10-01), Watson
patent: 3743755 (1973-07-01), Watson
patent: 4134321 (1979-01-01), Woron

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