Electronic piano

Details Electronic piano Electronic piano

1979-04-25

1981-02-03

Witkowski, S. J.

Music

Instruments

84 11, 84 113, 84DIG9, 84 119, G10H 112, G10H 500

Patent

active

042481236

ABSTRACT:
An electronic musical instrument using continuous tone generators capable of simulating the sounds of a conventional acoustical piano. The instrument includes a gating circuit featuring a timed switch travel circuit having a double-time constant for improved control of the dynamic range from the keyboard, and a soft pedal controlling the keying voltage to produce more realistic emulation of the dynamic effects of an acoustical piano. The gating circuit produces a double-time-constant envelope of nearly harmonically related signals for a more realistic piano timbre. The tone spectrum is also controlled as a function of signal level by means of a resistor matrix feeding selected inputs of an active ladder filter, in order to reproduce timbre variation with dynamic level.

REFERENCES:
patent: 84, None
patent: 2126464 (1938-08-01), Hammond
patent: 2482548 (1949-09-01), Kerkof
patent: 3444306 (1969-05-01), Peterson
patent: 3507970 (1970-04-01), Jones
patent: 3516321 (1970-06-01), Harris
patent: 3602628 (1971-08-01), Peterson
patent: 3717715 (1973-02-01), Jordy
patent: 3767834 (1973-10-01), Hebeisen et al.
patent: 3784718 (1974-01-01), Uchiyama
patent: 3836693 (1974-09-01), Ichikawa
patent: 3935783 (1976-02-01), Machanian et al.
patent: 3937115 (1976-02-01), Staley
patent: 3948139 (1976-04-01), Melcher et al.
patent: 4111092 (1978-09-01), Adachi
patent: 4129056 (1978-12-01), Jensen et al.
patent: 4141269 (1979-02-01), Itakura
patent: 4142437 (1979-03-01), Kakehasi

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