Musical tone synthesizing apparatus utilizing an all pass filter

Details Musical tone synthesizing apparatus utilizing an all pass filter Musical tone synthesizing apparatus utilizing an all pass filter

1990-05-15

1992-08-11

Shoop, Jr., William M.

Music

Instruments

Electrical musical tone generation

84661, 84699, 84DIG9, 84DIG10, G10N 112

Patent

active

051369176

ABSTRACT:
A musical tone synthesizing apparatus has a closed-loop configuration including an adder, a filter and a delay circuit. The adder adds its feedback signal to a signal to be synthesized which is applied from an external device. The filter constructed as the all-pass filter has a frequency characteristic by which a phase delay between its input and output signals is varied in response to a frequency variation of its input signal. Such all-pass filter includes a delay element having a delay time which is set longer than a predetermined unit delay time corresponding to a sampling period to be employed. Herein, the output of adder is fed back to the adder via the all-pass filter and delay circuit as the feedback signal. Thus, a signal circulating the closed-loop is picked up as a synthesized musical tone signal.

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Musical Applications of Microprocessors, Hayden Book Company Inc., Chamberlin, 1980, pp. 447-451.

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