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Transfer Fn: skip phase calculation for silence and small signal levels

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This fixes some division by zero as well as rounding issues for
signals < -160dBFS, resulting in garbage being displayed..
This commit is contained in:
Robin Gareus 2019-06-04 14:41:50 +02:00
parent dba3ff5236
commit 69194df4d9
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GPG key ID: A090BCE02CF57F04
1 changed files with 9 additions and 6 deletions
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7
gtk2_ardour/fft.cc
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@ -79,13 +79,16 @@ FFT::analyze(ARDOUR::Sample *input, WindowingType windowing_type)
for (uint32_t i = 1; i < _data_size - 1; ++i) { for (uint32_t i = 1; i < _data_size - 1; ++i) {
power = (Re * Re) + (Im * Im); power = (Re * Re) + (Im * Im);
phase = atanf(Im / Re); if (power < 1e-16) {
phase = 0;
} else {
phase = atanf (Im / Re);
if (Re < 0.0 && Im > 0.0) { if (Re < 0.0 && Im > 0.0) {
phase += M_PI; phase += M_PI;
} else if (Re < 0.0 && Im < 0.0) { } else if (Re < 0.0 && Im < 0.0) {
phase -= M_PI; phase -= M_PI;
} }
}
_power_at_bin[i] += power; _power_at_bin[i] += power;
_phase_at_bin[i] += phase; _phase_at_bin[i] += phase;