| 摘要 |
PURPOSE:To withstand the noise, by outputting sinusoidal wave data from a ROM under the speed in correspondence to the signal from a frequency setting section with a binary signal, and by arithmetically comparing it with the triangular wave binary signal generated by the use of an up-down counter. CONSTITUTION:The voltage signal in a frequency set at a frequency setting section 1 is outputted to a pulse generation section 15 and an arithmetic comparison section 4. The pulse generation section 15 inputs the pulse in correspondence to the voltage signal to a counter 16 and converts it into an eight-bit binary signal, with which the address of a ROM 2 is specified. At the triangular wave section 3, the pulse signal from an oscillation section 5 is outputted to an up- down counter 6 and counted, while a stepped triangular wave data is converted into an eight-bit binary signal and outputted to an arithmetic comparison section 4. At the comparison section 4, the eight-bit binary signal of the triangular wave data is multiplied 8 by the coefficient in correspondence to the voltage signal and is compared with the signal from the ROM 2 at a comparison section 7 to output a PWM signal. The signal withstanding the noise is hence formed.
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