| 摘要 |
<p>The tone variation means is used for electronic musical instruments, e.g. an electronic organ, and employs a number of tone filters, which can be switched in or out of circuit. The filters are switched in circuit by selector switching means (12), for automatically switching one or more sound filters (6, 8, 10) either together or in a number of steps. Preferably, a pulse source (20) is used to provide control pulses for the selector switching means (12). A ring counter may be indexed by given chords or tones and provides pulses for the selector switching means when a given count value is reached. The circuit includes a voltage source (2) and a tone generator (4).</p> |
