| 摘要 |
PURPOSE:To surely resolve an undershoot and an overshoot by selecting a digital pattern data having a different amplitude obtained mostly by gradually increasing and gradually decreasing the amplitude of an output periodic function at the point of time of the generation and the termination of an analog periodic functional signal. CONSTITUTION:When a metering signal MET is made to be a high level at time t0, a periodic control counter CUNTpre starts a counting operation and supplies a count data Dcunt to a decoder DEC. Besides an amplitude control counter CUNTamp starts the counting operation and supplies a clock signal Q1 or Q3 to the decoder at a period which is successively doubled and selects the individual digital pattern data out of the group of the digital pattern data successively selected according to the order of the periodic function. Thus, it is increased gradually like successively 1/8, 1/4, 1/2 nearly in a ramp shape. When the clock signal Q3 finishes one period the selection contrary to the above mentioned, is performed.
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