| 摘要 |
An automatic arpeggio for a keyboard-operated instrument in which a tone generator is assigned to a key when the key is actuated, the fundamental frequency of the assigned tone generator being determined by octave and note data stored as a control word in a memory in response to operation of the key. On keying the different notes of the arpeggio chord on the keyboard and activating an arpeggio Load switch, a control word is loaded in the memory for each key of the arpeggio chord, the words being coded to identify the value of the note and the sequence number of the note in the arpeggio chord. The arpeggio chord control words in memory are transferred one at a time to a tone generator in a sequence according to the stored sequence numbers of the control words. Arithmetic means, in synchronism with an arpeggio clock, generates note sequence numbers by which the control words are addressed in memory. The note value is transferred to the tone generator together with octave information from the arithmetic means. The tone generator, in response to the octave and note information received with each control word, generates the corresponding tone. The arithmetic unit changes the note sequence number for addressing a different control word of the arpeggio chord with each arpeggio clock. The arithmetic unit is capable of modifying the note number and the octave number in various types of sequences under the selective control of the musician.
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