Music – Instruments – Electrical musical tone generation
Patent
1990-03-19
1991-04-30
Witkowski, Stanley J.
Music
Instruments
Electrical musical tone generation
84629, 84633, G10H 1057, G10H 146
Patent
active
050107992
ABSTRACT:
An electronic keyboard instrument has a plurality of key displacement sensors disposed in relation to respective keys of a keyboard. Each sensor detects a continuously variable key displacement induced by the key operation to provide an analog signal indicative of the displacement. An analog-to-digital converter digitizes the analog signal at a predetermined sampling rate to derive a stream of digital samples of key displacement. A control, which operates based on a predetermined tone control algorithm receives and analyzes the stream of digital samples. According to the analysis, tone parameters such as envelope and vibrato are produced for controlling the characteristics of a tone, so that a tone having a very dynamic key touch response is developed. In a preferred embodiment, there are provided a plurality of tone control algorithms adapted to process the stream of key displacement samples in manners different from one another. A manually operative selector selects the desired one of the algorithms to be used by the control during the play of the instrument. "
REFERENCES:
patent: 4178823 (1979-12-01), McCoskey et al.
patent: 4651611 (1987-03-01), Deforeit
Hanzawa Kohtaro
Tanaka Kikuji
Casio Computer Co. Ltd.
Witkowski Stanley J.
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