Pitch and amplitude calculator and converter which provides an o

Music – Instruments

Patent

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Details

84 128, 84DIG9, G10H 112, G10H 302, G10H 700

Patent

active

046900268

ABSTRACT:
A system for converting musical sounds into digital data for use with a electronic synthesizer. An infra red pitch sensor detects pitch of string vibration. Envelope of this signal is filtered and applied to a comparator with floating threshold. Square wave output of comparator is used to reset a continually running counter and latch valid data into a latch. Valid data is used as address for a memory which contains quantized values corresponding to standard musical notes. Transposition of keys may be accomplished in memory lookup table. Amplitude of input signal is detected by A/D converter, and with pitch information from memory lookup table is sent to processor. Processor makes decision when valid data is present, and when present outputs data to synthesizer.

REFERENCES:
patent: 3647929 (1972-03-01), Milde, Jr.
patent: 3960043 (1976-06-01), Brand
patent: 4151775 (1979-05-01), Merriman
patent: 4463650 (1984-08-01), Rupert

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