Touch responsive control system for a keyboard electronic musica

Details Touch responsive control system for a keyboard electronic musica Touch responsive control system for a keyboard electronic musica

1975-02-27

1977-07-05

Jackmon, E. S.

Music

Instruments

84 101, 84 113, 84 124, 84 126, G10H 102, G10H 300

Patent

active

040332195

ABSTRACT:
Touch responsive control of note amplitude and harmonic content is achieved by providing each key with a touch responsive transducer. A set of attack/decay scale factors are accessed sequentially from a memory and used to establish the amplitude envelope of the generated note. The accessed scale factors are modified by the transducer output to effectuate touch responsive amplitude control. In a preferred embodiment, scale factors stored in consecutive memory locations define a piano-like attack/decay envelope. The transducer output sets the initial memory access location, so that the harder the key is struck, the greater the initial amplitude of the generated note.
Other embodiments include touch responsive control of the constituent Fourier components of the generated tone; and utilization of multiplexing for time shared connection of plural analog touch responsive transducers to a single analog to digital converter. A touch responsive transducer is disclosed that utilizes a force-reducing air pressure cylinder to drive a code wheel which provides a digital output signal indicative of the force with which the key is struck.

REFERENCES:
patent: 3515792 (1970-06-01), Deutsch
patent: 3617604 (1971-11-01), Adachi
patent: 3809786 (1974-05-01), Deutsch
patent: 3823390 (1974-07-01), Tomisawa
patent: 3882751 (1975-05-01), Tomisawa
patent: 3902398 (1973-12-01), Nakada et al.
patent: 3910150 (1975-10-01), Deutsch et al.

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