78 lines
2.1 KiB
C
78 lines
2.1 KiB
C
// aps.h
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//
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// Author: J.A. de Jong - ASCEE
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//
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// Description:
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//
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//////////////////////////////////////////////////////////////////////
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#pragma once
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#ifndef APS_H
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#define APS_H
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#include "types.h"
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#include "ascee_math.h"
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#include "window.h"
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typedef struct AvPowerSpectra_s AvPowerSpectra;
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/**
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* Allocates a AvPowerSpectra object which is used to compute an
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* averaged power spectra from given input time samples.
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*
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* @param[in] nfft Size of the fft,
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*
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* @param[in] nchannels Number of channels of time data to allocate
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* for.
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*
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* @param[in] overlap_percentage. Should be 0<= overlap_pct < 100. The
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* overlap percentage will be coerced, as the offset will be an
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* integer number of samples at all cases. Therefore, the real overlap
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* percentage can be obtained later on
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*
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* @param wt
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*
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* @return
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*/
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AvPowerSpectra* AvPowerSpectra_alloc(const us nfft,
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const us nchannels,
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const d overlap_percentage,
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const WindowType wt);
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/**
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* Computes the real overlap offset
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*
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* @param aps
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*/
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d AvPowerSpectra_realoverlappct(const AvPowerSpectra* aps);
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/**
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* Return the current number of averages taken to obtain the result.
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*
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* @return The number of averages taken.
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*/
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us AvPowerSpectra_getAverages(const AvPowerSpectra*);
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/**
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* Add time data to this Averaged Power Spectra. Remembers the part
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* that should be overlapped with the next time data.
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*
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* @param aps AvPowerSpectra handle
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*
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* @param timedata Pointer to timedata buffer. Number of rows SHOULD
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* *at least* be nfft. Number of columns should exactly be nchannels.
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*
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* @return pointer to the averaged power spectra buffer that is being
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* written to. Pointer is valid until AvPowerSpectra_free() is called.
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*/
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cmat* AvPowerSpectra_addTimeData(AvPowerSpectra* aps,
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const dmat* timedata);
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/**
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* Free storage of the AvPowerSpectra
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*/
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void AvPowerSpectra_free(AvPowerSpectra*);
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#endif // APS_H
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//////////////////////////////////////////////////////////////////////
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