Self adaptive and shadow sensitive electronic musical instrument

Details Self adaptive and shadow sensitive electronic musical instrument Self adaptive and shadow sensitive electronic musical instrument

1989-09-28

1991-04-30

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

2502084, G01V 904

Patent

active

050120859

ABSTRACT:
A self adaptive and shadow sensitive electronic musical instrument is disclosed. The invention utilizes digital techniques to sense the shadow over any one of the photo cell. There is a reference photo cell's generates a threshold voltage which would be adapted to the ambient light source. Each shaded photo cell generates frequency voltage which will be compared with the reference photo cell's threshold voltage to decide the frequency should be ON or OFF (because the invention uses one bit to represent one photo cell's frequency at 2 MHz sample rate). Then the instrument generates a sound wave shape which is in proportion to the sum of the shaded photo cells' frequency.

REFERENCES:
patent: 4504933 (1985-03-01), Janney
patent: 4699038 (1987-10-01), Wedge
patent: 4707597 (1987-11-01), Schulz-Henig et al.
patent: 4785703 (1988-11-01), Ichiki

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