69 lines
1.4 KiB
C
69 lines
1.4 KiB
C
// fft.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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// Interface to the FFT library, multiple channel FFT's
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//////////////////////////////////////////////////////////////////////
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#pragma once
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#ifndef FFT_H
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#define FFT_H
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#include "types.h"
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#include "ascee_math.h"
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/**
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* Perform forward FFT's on real time data.
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*
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*/
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typedef struct Fft_s Fft;
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/**
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* Construct an Fft object
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*
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* @param nfft Nfft size
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*
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* @return Pointer to Fft handle, NULL on error
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*/
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Fft* Fft_alloc(const us nfft);
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/**
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* Returns the nfft for this Fft instance
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*
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* @return nfft
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*/
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us Fft_nfft(const Fft*);
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/**
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* Compute the fft of a single channel.
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*
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* @param[in] fft Fft handle.
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*
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* @param[in] timedata Input time data pointer, should have size nfft
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* @param[out] result Pointer to result vector should have size
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* nfft/2+1
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*/
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void Fft_fft_single(const Fft* fft,const vd* timedata,vc* result);
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/**
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* Compute the fft of the data matrix, first axis is assumed to be
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* the time axis.
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*
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* @param[in] fft Fft handle.
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* @param[in] timedata Input time data. First axis is assumed to be
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* the time, second the channel number.
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*
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* @param[out] result: Fft't data, should have size (nfft/2+1) *
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* nchannels
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*/
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void Fft_fft(const Fft* fft,const dmat* timedata,cmat* result);
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/**
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*
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*
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* @param fft
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*/
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void Fft_free(Fft* fft);
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#endif // FFT_H
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//////////////////////////////////////////////////////////////////////
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