| 摘要 |
PURPOSE: To reduce the required capacity of a ROM, to reduce circuit scale and to reduce power consumption by providing three devices for respectively generating specified data, and providing the waveform data of a sine wave by adding the data of these three devices. CONSTITUTION: A bit inverter 2 is composed of an EX-OR step. The outputs of the bit inverter 2 are data corresponding to the phases from '0' toπ/2. With these data as inputs, the sine waveform data corresponding to the phases from '0' toπ/2 are separately generating, calculating following three data, data [1:M-1] are data to be linearly increased from the value of sine waveform data at the time of phase '0', data B (B[1:M-4]) are data of the 1/4 value of data A at the phases from '0' toπ/4, and data C (C[1:M-4]) are data for correction. These three kinds of amplitude data are added by a full adder 5 so that the half-wave rectified waveform of a sine wave can be provided.
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