Programmable sound circuit for electronic games

Details Programmable sound circuit for electronic games Programmable sound circuit for electronic games

1981-11-27

1984-10-02

Kemeny, E. S. Matt

Electrical audio signal processing systems and devices

Monitoring/measuring of audio devices

Loudspeaker operation

364410, G10L 100

Patent

active

044752288

ABSTRACT:
A sound generator for use with microprocessor controlled amusement games includes a programmable sound generator and programmable filters. The programmable filters utilize duty-cycle-controlled resistors to provide analog filtering under microprocessor control. Resistor duty cycles are made variable over a wide range by means of aperiodic clocking signals.

REFERENCES:
patent: 4250455 (1981-02-01), Davis
patent: 4272649 (1981-06-01), Pfeiffer
patent: 4301328 (1981-11-01), Dorais
Stout, D. F. and Kaufman, M., Handbook of Microcircuit Design and Application, N.Y., McGraw-Hill, 1980, pp. 8-8 to 8-11.
Alles, H. G., "Musical Synthesis Using Real Time Techniques," Proceedings IEEE, vol. 68, No. 4, (Apr. 1980), pp. 438-441.
Lancaster, D., Active Filter Cook Book, Indianapolis, Howard W. Sams & Co., 1975, Ch. 3 and pp. 200-203.
General Instrument Corp., AY-3-8910/8912, Programmable Sound Generator for Data Manual, 1979, pp. 1-61.
Chamberlain, H., Musical Applications of Microprocessors, Rochelle Park, N.J., Hayden Book Co., 1980, pp. 443-447.

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