| 摘要 |
An electronic musical instrument is capable of processing, by the same processing circuit, parameter control analog information signals defining the shape of control waveforms for the modulation of musical tone signals, and analog musical tone signal generation mode select signals for selecting, for example, a musical tone signal waveform and filter characteristic. The parameter control analog information signals and generation mode analog select signals are both optionally set by a player and are multiplexed in a time sharing manner by an analog multiplexer. The multiplexed analog signals are converted into digital signals, which are converted into analog signals, and further demultiplexed. In a write mode, the digital signals are stored in a memory, while, in a read mode, the digital signals are read out of the memory, converted into analog signals, and demultiplexed. The demultiplexed parameter control analog signals are coupled to control waveform generator circuits, and the analog select signals are coupled to voltage detector circuits to have their analog voltage levels detected. The generation mode of a musical tone signal depends on voltage levels of the analog select signals.
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