| 摘要 |
An arpeggiator for an electronic organ, comprising a source of ramp voltage having selectively a slowly ascending and a slowly descending section or only a slowly ascending section followed by a rapid reset, an accordion-like voltage divider for said ramp voltage consisting of a cascade of diodes, each calling forth one of a group of three tone signals when conductive, or no tone signal if short circuited, circuits for determining which diodes shall be conductive and which short circuited according to which keys of an organ are actuated, the ramp voltage peaking when all conductive diodes have been ascendingly scanned by the ramp voltage, each conductive diode when scanned by the ramp voltage falling forth a gating signal for one of the tone signals called for by the actuated keys, in orderly sequence of tone signals. The rates of ascent and descent of the ramp are controllable, and may at will cover all octaves of the organ higher than that encompassing actuated keys, or a limited range, including one, of octaves. The gates employed are arranged to provide piano like tones of variable sustain durations, and the ramp controlled circuitry may be disabled to enable a piano mode rather than an arpeggiation mode.
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