use negative frequency for demod

2024-12-28 19:05:02 +08:00 · 2024-12-28 19:05:02 +08:00 · 3895b13662
commit 3895b13662
parent 36a2405f83
1 changed files with 1 additions and 1 deletions
--- a/sndlock.cpp
+++ b/sndlock.cpp
@ -108,7 +108,7 @@ static void dsp_thread()
                        sample += (double)buf_in[SND_RCHAN*j+k];
                    std::complex<double> rotated;
                    rotated = sample*std::polar(scale, phase_in[i]*2.0*M_PI/(double)UINT32_MAX);
-                    phase_in[i] += ftw[i];  // wraps on underflow
+                    phase_in[i] -= ftw[i];  // wraps on underflow

                    lpf_y[i] += (rotated - lpf_y[i])*lpf_k[i];
                    double mag = std::abs(lpf_y[i]);