Electronic musical instrument having portamento property
Number of patents in Portfolio can not be more than 2000
United States of America
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Jun 30, 1987
Grant Date -
N/A
app pub date -
Oct 4, 1985
filing date -
Jun 25, 1976
priority date (Note) -
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Importance
Abstract
In a electronic musical instrument wherein a portamento is played by supplying the pitch voltage corresponding to a subsequently depressed key to a capacitor holding the pitch voltage corresponding to a previously depressed key, the charge and discharge currents of the capacitor corresponding to the difference between the two pitch voltages are controlled to vary exponentially thus changing exponentially the capacitor terminal voltage. The terminal voltage of the capacitor is applied to drive a voltage controlled oscillator to vary its oscillation frequency. To vary exponentially the terminal voltage of the capacitor, a mutual conductance converter is connected between the capacitor and a keyboard section and the output current from the mutual conductance converter is controlled by a control signal corresponding to the terminal voltage of the capacitor.
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