- output[i] = abs( complexOutput[i] );
- } else if (m_idFilterMethod == FILTER_METHOD_FFT || FILTER_METHOD_FFT_ZEROPAD_2 || FILTER_METHOD_FFT_ZEROPAD_4) {
- fftw_complex in[m_nFilterPoints], out[m_nFilterPoints];
- for (int i = 0; i < m_nSignalPoints; i++) {
- in[i].re = input[i];
- in[i].im = 0;
- }
- for (int i = m_nSignalPoints; i < m_nFilterPoints; i++) {
- in[i].re = in[i].im = 0; // ZeroPad
- }
- fftw_one(m_planForward, in, out);
- if (m_traceLevel >= TRACE_PLOT) {
- double test[m_nFilterPoints];
- for (int i = 0; i < m_nFilterPoints; i++)
- test[i] = sqrt(out[i].re * out[i].re + out[i].im * out[i].im);
- ezplot_1d(test, m_nFilterPoints);
- cio_kb_getc();
- }
- for (int i = 0; i < m_nFilterPoints; i++) {
- out[i].re = m_vecFilter[i] * out[i].re / m_nSignalPoints;
- out[i].im = m_vecFilter[i] * out[i].im / m_nSignalPoints;
- }
- if (m_traceLevel >= TRACE_PLOT) {
- double test[m_nFilterPoints];
- for (int i = 0; i < m_nFilterPoints; i++)
- test[i] = sqrt(out[i].re * out[i].re + out[i].im * out[i].im);
- ezplot_1d(test, m_nFilterPoints);
- cio_kb_getc();
- }
- fftw_one(m_planBackward, out, in);
- if (m_traceLevel >= TRACE_PLOT) {
- double test[m_nFilterPoints];
- for (int i = 0; i < m_nFilterPoints; i++)
- test[i] = sqrt(in[i].re * in[i].re + in[i].im * in[i].im);
- ezplot_1d(test, m_nFilterPoints);
- cio_kb_getc();
- }
+ output[i] = inverseFourier[i];
+ } else if (m_idFilterMethod == FILTER_METHOD_FOURIER_TABLE) {
+ double inputSignal[m_nFilterPoints];
+ for (int i = 0; i < m_nSignalPoints; i++)
+ inputSignal[i] = input[i];
+ for (int i = m_nSignalPoints; i < m_nFilterPoints; i++)
+ inputSignal[i] = 0; // zeropad
+ complex<double> fftSignal[m_nFilterPoints];
+ finiteFourierTransform (inputSignal, fftSignal, -1);
+ for (int i = 0; i < m_nFilterPoints; i++)
+ fftSignal[i] *= m_vecFilter[i];
+ double inverseFourier[m_nFilterPoints];
+ finiteFourierTransform (fftSignal, inverseFourier, 1);