void QFilter::Decimate(CPX &in, CPX &out, int downrate) {
int newsize = qRound((float) m_size/downrate);
//memset(out, 0, newsize * sizeof(CPX));
//memset(tmp, 0, m_size * sizeof(CPX));
out.resize(newsize);
tmp.resize(m_size);
//memcpy(tmp, in, m_size * sizeof(CPX));
memcpy(tmp.data(), in.data(), m_size * sizeof(cpx));
for (int j = 0; j < newsize; j++) {
for (int k = 0; k < downrate; k++) {
//for (int k = 0; k < downrate - 1; k++) {
if (j * downrate + k < m_size) {
out[j].re += tmp.at(j * downrate + k).re;
out[j].im += tmp.at(j * downrate + k).im;
}
}
}
}
