频谱分析

fftw_plan plan = fftw_plan_dft_r2c_1d( fftAnaSrcPoints, ppFFTSrcValue[k], ppFFTComplexDst[k], FFTW_ESTIMATE); if (NULL != plan) { fftw_execute(plan); fftw_destroy_plan(plan); for (int j = 0; j < fftAnaSrcPoints; j++) { double dAmp = sqrt(pow(ppFFTComplexDst[k][j][0], 2) + pow(ppFFTComplexDst[k][j][1], 2)); ppFFTComplexDstAmp[k][j] = dAmp / (fftAnaSrcPoints / 2); } ppFFTComplexDstAmp[k][0] = 0; }