Opto-electronic sensing method and device for an acoustic piano

Details Opto-electronic sensing method and device for an acoustic piano Opto-electronic sensing method and device for an acoustic piano

1989-03-27

1991-03-19

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

200332, G01D 534

Patent

active

050013394

ABSTRACT:
A new, inexpensive and unobtrusive opto-electronic sensor which requires no manual adjustments after installation under the keys of the piano keyboard. Post-installation manual adjustments are unnecessary because a method embodied in a computer program and performed by a microprocessor digitally adjusts the operating ranges of the keys. After electronic adjustment, the opto-electronic sensors are scanned and sampled according to another portion of the method to determine the current key position and velocity. The key position and the velocity determined by the method are then transmitted in a MIDI compatible data stream.

REFERENCES:
patent: 4680465 (1987-07-01), Stevens
patent: 4731530 (1988-03-01), Mikan
patent: 4864124 (1989-09-01), Mirabella et al.
patent: 4894530 (1990-01-01), Kitchen

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