| 摘要 |
PROBLEM TO BE SOLVED: To surely generate a clock component signal synchronized with an envelope curve signal obtained by sampling for an input signal in the NRZ (non return to zero) system. SOLUTION: The sampling apparatus comprises a sampling section 21 which samples an input signal x(t) with a period having a difference with respect to the multiple of the repetition period of its waveform and outputs an envelope curve signal h(t) having a waveform obtained by successively connecting amplitude values obtained by the sampling and a clock component signal generation section 22 for generating and outputting a sinusoidal signal having the same frequency as the bit rate of the envelope curve signal h(t) as a clock component signal. The clock component signal generation section 22 includes a nonlinear circuit 23 which deforms the waveform of the envelope curve signal h(t) and generates a frequency component which is double the fundamental wave component of the envelope curve signal h(t) and a filter 26 for extracting the frequency component which is double the fundamental wave component of the envelope curve signal h(t) out of an output signal g(t) of the nonlinear circuit 23, generating and outputting a clock component signal q(t) from the envelope curve signal h(t) obtained for the input signal x(t) in the NRZ system. COPYRIGHT: (C)2008,JPO&INPIT
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