| 摘要 |
<p>A measuring/arithmetic means, in which it is not required to take into account the phase offset between reproduced ideal data and a measured phase data. The measuring/arithmetic means comprises A/D converters which quantize two orthogonal component signals, an offset extracting section which finds the offset and amplitude which are the center of phase rotation, a phase detecting section which outputs phase data based on data from which the offset is subtracted, a differentiator which converts the phase data into a frequency data f(t) by differentiating the phase data, a DFT-processing section which outputs the frequency f0 of bit rates by squaring and DFT-processing the frequency data f(t), a bit data reproducing section which generates bit data Bdat(t) upon receiving the frequency data f(t) from the differentiator and the frequency f0 of bit rates, an ideal data generating section which generates ideal frequency data fref(t), a difference calculating section which subtracts the ideal data fref(t) from the frequency data f(t), and an integrating/phase error outputting section which converts the difference into phase information by integration and outputs the phase information as an effective phase value error.</p> |
