Before that, a cross spectrum
assembly of academics rose to oppose.
The normalized complex cross spectrum
of the complex autospectra [S.sub.i] and [S.sub.j] for the ith and jth receiving channels has been widely used by the community of radar oceanography to extract the sea surface information from the radar returns detected by difference receiving channels, which is defined as follows:
For the obtained cross spectrum
the coherence is plotted
These comparisons show clearly that the parameters of the structure model are well identified since the data spectra and the model fit despite the divergence that appeared in all the cross spectrum
and the autospectrum of sensor 3.
9 shows the phase and magnitude of the cross spectrum
measured on the rear of the roof (with a free stream velocity of 240 km/h in this case).
The functionality for two-channel FFT operations includes frequency response, cross spectrum
and coherence functions.
It is proved that sound intensity in magnitude is equal to the imaginary part of the cross spectrum
of FFT applied to a cross correlation function of the time domain signal recorded by the two microphones .
* Frequency analysis--Power spectrum, FFT, zoom FFT, power spectral density, frequency response, coherence, cross spectrum
, peak search, power in band
The cross spectrum
method of analysis is based on the Fourier transform, which serves in the conversion of information from the time domain to the frequency domain and vice-versa.
[C.sub.12] = real part of the cross spectrum
between points one and two;
The cross spectrum
, [S.sub.xy]([omega]), is given by:
Various flavors of signal analysis (area under the curve, convolution, correlation, derivative, integral and signal energy) and spectral analysis (Fourier spectrum, cross spectrum
, harmonic estimation, order tracking, spectral estimation, time-frequency spectrum, uneven data Fourier spectrum) are available with many choices as to the parameters, algorithms and result types.