| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a periodic function generating circuit which generates a periodic function completely free of frequency distortion, amplitude distortion, and a phase shift from a sampling clock by combining the read output of a function ROM and the output of a zero-cross flag control circuit together into an encoded sampling value series. SOLUTION: This circuit is composed of an address counter 1 and a function ROM 2 stored with the amplitude value of a generated periodic function. The function ROM 2 is stored with an amplitude value for a quarter of one cycle of the periodic function in each address, and inputs the output signal a4 of a register 7 as an address signal calculated by the address counter 1 and outputs the amplitude value corresponding to each address. The read-out output signal a9 and the output signal a6 of the zero-cross flag control circuit as a code bit are put together to generate an encoded sampling value series of one cycle of the periodic function.</p> |
