Diff: DFT.h

Revision:

0:6863633bf8a4

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DFT.h	Fri Mar 24 11:22:30 2017 +0000
@@ -0,0 +1,37 @@
+
+// This file first preprocesses a 1024 long data array by:
+// - Calculating and substracting the mean
+// - Applying a hanning window
+// - Re-indexing the array
+// It then applies a radix-2 Cooley Tukey FFT to create a DFT of the original signal
+
+#pragma once
+#ifndef _DFT_H_
+#define _DFT_H_
+
+#include <string.h> // Only for memcpy
+#include "LookupTables.h"
+#include "complexmath.h"
+
+// Preprocesses the data array and performs a dft on it, ARRAY MUST BE 1024 LONG
+void performFFT(float* datam, int datalength);
+
+// Performs a radix-2 cooley tukey FFT on the data array
+void cooleyTukeyRadix2(float* data, int datalength);
+
+// Calculates and subtracts the signal mean
+void subMean(float* data, int datalength);
+
+// Reindexes the array in preperation of the FFT
+void reindexData(float* data, int datalength);
+
+// Removes the DC component and null everything above the nyquist frequency
+void afterProcessing(float* data, int datalength);
+
+// Filter a frequency and its multiples
+void filterfreq(int frequency, float* data, int datalength);
+
+// Calculate total magnitude, frequency magnitude component integrating module (FMCIM)
+int calcPSD(float* data, int datalength);
+
+#endif
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