Circuit for producing musical tones

Details Circuit for producing musical tones Circuit for producing musical tones

1981-12-30

1983-08-09

Witkowski, S. J.

Music

Instruments

84 113, 84DIG2, 84DIG8, 84DIG20, G10H 1055, G10H 122

Patent

active

043972110

ABSTRACT:
A circuit for producing musical tones is disclosed which includes a keyboard for selecting the musical tones, and a tone generator responsive to the keyboard for generating a square wave signal having the frequency of the musical note to be generated. A charging circuit is provided for charging a capacitor to a predetermined level of voltage when the square wave signal is terminated, and for exponentially discharging the capacitor when the square wave signal is initiated. A modulation circuit amplitude modulates the square wave signal in proportion to the capacitor voltage to produce an exponentially decaying signal which simulates the waveform produced by a struck piano string. A speaker is also included to convert the exponentially decaying signal into audible musical tones having the sound of piano notes. The circuit of the invention requires only a small number of components, making it suitable for use in miniature musical toys.

REFERENCES:
patent: 3383453 (1968-05-01), Sharp
patent: 3544699 (1970-12-01), Harris

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