不韋 呂 / Mbed 2 deprecated Demo_FFT_IFFT

Application example of FftReal class. FftReal クラスの使用例．

Dependencies:   Array_Matrix mbed UIT_FFT_Real

main.cpp@0:5bed9d6dc43b, 2014-12-19 (annotated)

Committer:
MikamiUitOpen
Date:
Fri Dec 19 12:12:12 2014 +0000
Revision:
0:5bed9d6dc43b
Child:
1:f070e455cea0
1

Who changed what in which revision?

UserRevisionLine numberNew contents of line
MikamiUitOpen 0:5bed9d6dc43b 1 //--------------------------------------------------------------
MikamiUitOpen 0:5bed9d6dc43b 2 // Test of FftReal class
MikamiUitOpen 0:5bed9d6dc43b 3 // Copyright (c) 2014 MIKAMI, Naoki, 2014/12/19
MikamiUitOpen 0:5bed9d6dc43b 4 //--------------------------------------------------------------
MikamiUitOpen 0:5bed9d6dc43b 5
MikamiUitOpen 0:5bed9d6dc43b 6 #include "dftComplex.hpp"
MikamiUitOpen 0:5bed9d6dc43b 7 #include "fftReal.hpp"
MikamiUitOpen 0:5bed9d6dc43b 8
MikamiUitOpen 0:5bed9d6dc43b 9 #include "mbed.h"
MikamiUitOpen 0:5bed9d6dc43b 10
MikamiUitOpen 0:5bed9d6dc43b 11 using namespace Mikami;
MikamiUitOpen 0:5bed9d6dc43b 12
MikamiUitOpen 0:5bed9d6dc43b 13 int main()
MikamiUitOpen 0:5bed9d6dc43b 14 {
MikamiUitOpen 0:5bed9d6dc43b 15 const int N = 256;//16; // number of date for FFT
MikamiUitOpen 0:5bed9d6dc43b 16
MikamiUitOpen 0:5bed9d6dc43b 17 float x1[N], x2[N];
MikamiUitOpen 0:5bed9d6dc43b 18 Complex y1[N], y2[N/2+1];
MikamiUitOpen 0:5bed9d6dc43b 19
MikamiUitOpen 0:5bed9d6dc43b 20 srand(1234);
MikamiUitOpen 0:5bed9d6dc43b 21 for (int n=0; n<N; n++)
MikamiUitOpen 0:5bed9d6dc43b 22 x1[n] = 2.0f*rand()/(float)RAND_MAX - 1.0f;
MikamiUitOpen 0:5bed9d6dc43b 23 printf("\r\n#### Original data for DFT ####\r\n");
MikamiUitOpen 0:5bed9d6dc43b 24 for (int n=0; n<N; n++)
MikamiUitOpen 0:5bed9d6dc43b 25 printf("f[%2d]: %8.4f\r\n", n, x1[n]);
MikamiUitOpen 0:5bed9d6dc43b 26
MikamiUitOpen 0:5bed9d6dc43b 27 DftComplex(x1, y1, N);
MikamiUitOpen 0:5bed9d6dc43b 28 printf("\r\n#### Result of direct DFT ####\r\n");
MikamiUitOpen 0:5bed9d6dc43b 29 printf(" real imaginary\r\n");
MikamiUitOpen 0:5bed9d6dc43b 30 for (int n=0; n<N; n++)
MikamiUitOpen 0:5bed9d6dc43b 31 printf("F[%2d]: %8.4f, %8.4f\r\n", n, y1[n].real(), y1[n].imag());
MikamiUitOpen 0:5bed9d6dc43b 32
MikamiUitOpen 0:5bed9d6dc43b 33 Timer tm;
MikamiUitOpen 0:5bed9d6dc43b 34
MikamiUitOpen 0:5bed9d6dc43b 35 FftReal fft(N);
MikamiUitOpen 0:5bed9d6dc43b 36 tm.reset();
MikamiUitOpen 0:5bed9d6dc43b 37 tm.start();
MikamiUitOpen 0:5bed9d6dc43b 38 fft.Execute(x1, y2);
MikamiUitOpen 0:5bed9d6dc43b 39 tm.stop();
MikamiUitOpen 0:5bed9d6dc43b 40 printf("\r\nExecution time (FFT): %d [us]\r\n", tm.read_us());
MikamiUitOpen 0:5bed9d6dc43b 41 printf("\r\n#### Result of DFT using FFT ####\r\n");
MikamiUitOpen 0:5bed9d6dc43b 42 for (int n=0; n<=N/2; n++)
MikamiUitOpen 0:5bed9d6dc43b 43 printf("F[%2d]: %8.4f, %8.4f\r\n", n, y2[n].real(), y2[n].imag());
MikamiUitOpen 0:5bed9d6dc43b 44
MikamiUitOpen 0:5bed9d6dc43b 45 tm.reset();
MikamiUitOpen 0:5bed9d6dc43b 46 tm.start();
MikamiUitOpen 0:5bed9d6dc43b 47 fft.ExecuteIfft(y2, x2);
MikamiUitOpen 0:5bed9d6dc43b 48 tm.stop();
MikamiUitOpen 0:5bed9d6dc43b 49 printf("\r\nExecution time (IFFT): %d [us]\r\n", tm.read_us());
MikamiUitOpen 0:5bed9d6dc43b 50 printf("\r\n#### Result of IFFT ####\r\n");
MikamiUitOpen 0:5bed9d6dc43b 51 printf(" original IFFT of FFT\r\n");
MikamiUitOpen 0:5bed9d6dc43b 52 for (int n=0; n<N; n++)
MikamiUitOpen 0:5bed9d6dc43b 53 printf("f[%2d]: %8.4f, %8.4f\r\n", n, x1[n], x2[n]);
MikamiUitOpen 0:5bed9d6dc43b 54 }