60 lines
1.2 KiB
C
60 lines
1.2 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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* @param nchannels Number of channels
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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,const us nchannels);
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/**
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* Returns the number of channels for this Fft instance
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*
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* @return nchannels
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*/
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us Fft_nchannels(const Fft*);
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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 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] timedata Input time data pointer, such that
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* data[i*nfft+j) is the i-th channel from data stream j.
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*
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* @param[out] result: Fft't data, size should be (nfft/2+1)*nchannels
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*/
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void Fft_fft(const Fft*,const dmat* timedata,cmat* result);
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void Fft_free(Fft* fft);
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#endif // FFT_H
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//////////////////////////////////////////////////////////////////////
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