| 摘要 |
a ROM (8) for memorizing a dynamic frequency information signal; a D/A converter (9) for converting the dynamic frequency information signal of the ROM (8) to an analog signal; a voltage-controlled oscillator (10) for generating a frequency based on the size of the output voltage from the D/A converter (9); a top octave generator (11) for generating twelve basic tone frequencies from the output frequencies of the voltage-controlled oscillator (10); a frequency divider circuit(12) for dividing the twelve basic tone frequencies of the top octave generator (11) into dynamic frequencies over time; and an amplifier (13) for amplifying the partial tones from the frequency divider (12) according to a bandwidth information signal of a microprocessor (4) and outputting them to a mixer (6).
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