| 摘要 |
A musical instrument with a plurality of vibratile tone generators, whose oscillations are converted into alternating currents by electroacoustic transducers, is provided with a control circuit feeding back a regenerative vibratory signal of progressively diminishing amplitude to maintain the oscillations of a previously activated tone generator for a selected fade-out period. The duration of the fade-out period can be controlled by the player, e.g. with the aid of a pedal, by varying the time constant of a peak-storage network connected to the feedback loop. The feedback signal may be transmitted to the respective tone generator by a mechanical vibrator attached to the instrument body or by sound waves emitted from a loudspeaker. The player may also switch from the output of the peak-storage network to a constant control signal for sustained reverberation.
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