Music – Instruments
Patent
1980-06-26
1982-03-23
Truhe, J. V.
Music
Instruments
84 113, 84 127, G10H 102
Patent
active
043206824
ABSTRACT:
An improved envelope generator circuit for an electronic organ provides a musically correct attack rate, i.e., the volume of a musical note is increased by an equal number of decibels for equal increments of time. The envelope generating circuit comprises a constant current source for charging a capacitor to generate a linearly increasing voltage signal upon the initial activation of any one or more keys of an electronic organ keyboard. A regulator circuit comprising an operational amplifier and a matched pair of transistors with one transistor connected into the feedback path for the operational amplifier generates an anti-logarithmic control signal in response to the linearly increasing voltage signal. The antilogarithmic control signal is used to control the amplification of a controlled amplifier to which music signals from the organ are passed. The amplifier amplifies the musical signals in accordance with the control signal to generate an output which increases in volume an equal number of decibels for equal periods of time.
REFERENCES:
patent: 4109208 (1978-08-01), Tomisawa et al.
Moorer, "Signal Processing Aspects of Computer Music--A Survey" in Computer Music Journal, vol. 1, No. 1, Feb. 1977, p. 6.
Isen Forester W.
Marmon Company
Truhe J. V.
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