Music – Instruments
Patent
1975-04-23
1977-08-30
Witkowski, Stanley J.
Music
Instruments
84 125, 84DIG4, 84DIG8, G10H 102, G10H 502
Patent
active
040446433
ABSTRACT:
A circuit is shown for changing the frequency of a basic keyed oscillator by controlling the amount of keying voltage reaching the oscillator and the circuit used for vibrato. The purpose of this circuit is the achievement of true "pipe organ celeste" effect without using an added rank or set of oscillators. Circuits are described wherein the harmonic structure of the signal resulting from this modification of a basic keyed oscillator can be made to change by means of controlling the amount of keying voltage reaching the oscillator for the purpose of achieving the desired harmonic structure of the rank when operated in the "non-celeste" mode as opposed to the "celeste" mode. A circuit is also described for amplitude modulation and harmonic structure modulation at the vibrato rate to enhance the vibrato.
REFERENCES:
patent: RE27983 (1974-04-01), Stearns
patent: 2939359 (1960-06-01), Markowitz
patent: 3037413 (1962-06-01), Markowitz
patent: 3288904 (1966-11-01), George
patent: 3490327 (1970-01-01), Volpe
patent: 3609201 (1971-09-01), Adachi
patent: 3609203 (1971-09-01), Adachi
patent: 3639853 (1972-02-01), Sakai
patent: 3659031 (1972-04-01), Adachi
patent: 3701040 (1972-10-01), Borrevik et al.
patent: 3715445 (1973-02-01), Kniepkamp
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