Automatic rhythm-accompaniment apparatus for electronic musical instrument

摘要

An automatic rhythm accompaniment apparatus for an electronic musical instrument is characterized in that the same comprises a plurality of chord-memory circuits which detect and memorize respective first tones in respective bars of a melody played by the operation of keys, and a chord gate circuit which is driven by output signals of these chord memory circuits and rhythm pulses generated by a rhythm pulse generator so that, by opening and closing of the chord gate circuit, there is obtained rhythm-accompaniment tones caused by the first tones in the respective bars. A key selection circuit is provided at the front stage of the chord gate circuit so that rhythm accompaniment tones according to a key of the melody played may be obtained. A chord change- over circuit can be provided preceding the chord gate circuit so that a key of the melody can be selected. Rhythm- accompaniment tones of different chords appearing in the middle of the melody may be obtained.