Modular drum generator

Details Modular drum generator Modular drum generator

1979-10-01

1981-12-15

Moses, R. L.

Music

Instruments

84 127, 84DIG12, G10H 100

Patent

active

043053190

ABSTRACT:
The present invention is an improved modular drum generator which plays a recorded drum beat and which may be used in combination with a plurality of identical, improved modular drum generators to provide an electronic percussion section. The improved modular drum generator includes a bistable latch which has a clock input, which is electrically coupled to a computer which generates a "play" strobe pulse, a set of three data inputs, one of which is held at logic "1" and the other two of which are electrically coupled to a computer data bus which also generates volume data and pitch data, a reset input and a set of three outputs corresponding to the data inputs. The improved modular drum generator further includes a voltage controlled oscillator the input of which is electrically coupled to the pitch output of the bistable latch and the output of which is electrically coupled to the clock input of a twelve bit binary counter, which provides 2.sup.12 data words, thereby controlling the frequency of data conversion thereof. The enable count input of the twelve bit counter is electrically coupled to the "play" output of the bistable latch and the end of count output is electrically coupled to the reset input of the bistable latch. The improved modular drum generator further includes a read only memory, which contains 2.sup.12 binary words representing same on an analog waveform, which is a recording of the sound of a single drum strike, a digital to analog converter, which is electrically coupled to the read only memory in order to receive the binary words and to reconvert it to analog data so that it can be played through an amplifier, and an amplifier, which is electrically coupled to the analog to digital converter.

REFERENCES:
patent: 3763364 (1973-10-01), Deutsch et al.
patent: 3840691 (1974-10-01), Okamoto
patent: 4095501 (1978-06-01), Aoki
Lancaster, TTL Cookbook, 1974, p. 75.

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