| 摘要 |
A key-to-be-depressed designating apparatus, employed in a keyboard-type electronic musical instrument, is suitable particularly for novice keyboard-instrument players, and this apparatus is designed to automatically and sequentially designate the keys to be depressed in accordance with the predetermined tune. This apparatus includes a read-only memory (ROM) which pre-stores automatic performance data, a central processing unit (CPU) and a plurality of guide lamps. These guide lamps are disposed along with the keys of keyboard, so that they are sequentially turned on and off so as to designate a key to be depressed in accordance with the automatic performance data read from the ROM under control of the CPU. If the designated key is actually depressed by the performer within the predetermined period of time concerning its correct key-depression timing, key-to-be-depressed designating operation made by the guide lamps is continued. If not, such key-to-be-depressed designating operation is terminated. Thus, even if the novice player makes mis-touches and delay of key-depression in the keyboard-performance practice, the performance of the tune can be smoothly progressed.
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