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2 generalized time-variant and freq-dependent cases
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Compute the cross-correlation function of the two channels within a time window of interest. Phase spectrum intercept will give the phase difference (which is generally frequency-dependent). To compute the intercept, select a frequency band of interest, and compute a line that fits the phase spectrum withingwithin this band. If the line fits well, then the signal excerpts may indeed have the constant phase difference within the taken time window. Crossing of the line with the frequency zero line will give the intercept (which is the phase difference).

Compute the cross-correlation function of the two channels. Phase spectrum intercept will give the phase difference. To compute the intercept, select a frequency band of interest, and compute a line that fits the phase spectrum withing this band. Crossing of the line with the frequency zero line will give the intercept.

Compute the cross-correlation function of the two channels within a time window of interest. Phase spectrum intercept will give the phase difference (which is generally frequency-dependent). To compute the intercept, select a frequency band of interest, and compute a line that fits the phase spectrum within this band. If the line fits well, then the signal excerpts may indeed have the constant phase difference within the taken time window. Crossing of the line with the frequency zero line will give the intercept (which is the phase difference).

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source | link

Compute the cross-correlation function of the two channels. Phase spectrum intercept will give the phase difference. To compute the intercept, select a frequency band of interest, and compute a line that fits the phase spectrum withing this band. Crossing of the line with the frequency zero line will give the intercept.