| 摘要 |
<p>PURPOSE:To save the memory storage capacity and power consumption by devising the memory to obtain a sine and a cosine signals as as to have only to store only 1/4 cycle of a sine wave. CONSTITUTION:A sample data comprising a positive half cycle 0 deg.-180 deg. of a sinusoidal wave is outputted repetitively from a data selector and it is fed to a complement processing circuit 7, where the output of the data selector 5 is subject to complement processing at an interval of 180 deg. and a consecutive sinusoidal wave signal is outputted from the complement processing circuit 7. Moreover, a sample data of a waveform comprising 0 deg.-90 deg. component of a cosine wave and the component inverting the polarity of 90 deg.-180 deg. component of the cosine wave is outputted repetitively from a data selector 6, fed to a complement processing circuit 8, where the output of the data selector 6 is subject to complement processing at an interval of 180 deg. from the cycle point of 90 deg. with respect to the complement processing of the complement processing circuit 7 and a consecutive cosine wave signal is outputted from the complement processing circuit 8. Thus, the storage capacity of the storage means is less and the power consumption is less accordingly.</p> |
