| 摘要 |
A signal under measurement x(t) is transformed into a complex analytic signal z<SUB>c</SUB>(t), and an instantaneous phase of the x<SUB>c</SUB>(t) is estimated using the z<SUB>c</SUB>(t). A linear phase is removed from the instantaneous phase to obtain a phase noise waveform Deltaphi(t) of the x(t), and the Deltaphi(t) is sampled at a timing close to a zero-crossing timing of the x(t) to obtain a timing jitter sequence. Then a difference sequence of the timing jitter sequence is calculated to obtain a period jitter sequence. The period jitter sequence is multiplied by a ratio T<SUB>0</SUB>/T<SUB>k,k+1 </SUB>of the fundamental period T<SUB>0 </SUB>of the x(t) and the sampling time interval T<SUB>k,k+1 </SUB>to make a correction of the period jitter sequence. A period jitter value of the x(t) is obtained from the corrected period jitter sequence.
|
