PowerSpectra Class Reference

Computes single-sided cross-power spectra for a group of channels. Only a single block of length fft, no averaging. This class should normally not be used. Please refer to AvPowerSpectra instead. More...

#include <lasp_avpowerspectra.h>

Public Member Functions
	PowerSpectra (const us nfft, const Window::WindowType w)
	Initalize power spectra computer.
	PowerSpectra (const vd &window)
	Initalize power spectra computer.
ccube	compute (const dmat &input)
	Computes the spectra. Data is normalized by the (spectral) power of the window, to compensate for the effect of the window.

Public Attributes
us	nfft
	The FFT length.

Detailed Description

Computes single-sided cross-power spectra for a group of channels. Only a single block of length fft, no averaging. This class should normally not be used. Please refer to AvPowerSpectra instead.

Definition at line 22 of file lasp_avpowerspectra.h.

Constructor & Destructor Documentation

PowerSpectra() [1/2]

PowerSpectra::PowerSpectra	(	const us	nfft,
		const Window::WindowType	w
	)

Initalize power spectra computer.

Parameters

nfft	The fft length
w	The window type

Definition at line 12 of file lasp_avpowerspectra.cpp.

PowerSpectra() [2/2]

PowerSpectra::PowerSpectra

(

const vd &

window

)

Initalize power spectra computer.

Parameters

window

Uses the window length to compute fft length, and uses the window shape as the actual window.

Definition at line 15 of file lasp_avpowerspectra.cpp.

Member Function Documentation

compute()

ccube PowerSpectra::compute

(

const dmat &

input

)

Computes the spectra. Data is normalized by the (spectral) power of the window, to compensate for the effect of the window.

Parameters

input

Input data, first axis is assumed the sample, second axis the channel. Input first dimension should be equal to nfft, otherwise a runtime error is thrown.

Returns

Cross-power-spectra. Cubic array with size indices C_fij, where f is the frequency index, i is the row and j is the column. An element can be accessed by: C(f, i, j). Storage is such that frequency components are contiguous.

Run very often. Silence this one.

This one can be run in parallel without any problem. Note that it is the inner loop that is run in parallel.

Definition at line 27 of file lasp_avpowerspectra.cpp.

Member Data Documentation

nfft

us PowerSpectra::nfft

The FFT length.

Definition at line 27 of file lasp_avpowerspectra.h.

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The documentation for this class was generated from the following files:

• src/lasp/dsp/lasp_avpowerspectra.h
• src/lasp/dsp/lasp_avpowerspectra.cpp