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AM Demod: Snap to nearest centre frequency. #2815

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This commit is contained in:
Jon Beniston
2026-07-20 17:41:07 +01:00
parent f3c1d648ee
commit 7bc89a205c
1 changed files with 8 additions and 3 deletions
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plugins/channelrx/demodam/amdemodgui.cpp
+8 -3
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@@ -699,17 +699,22 @@ void AMDemodGUI::applySnap()
qint64 frequency = m_deviceCenterFrequency + m_settings.m_inputFrequencyOffset;
// Snap to nearest centre frequency
if (m_settings.m_frequencyMode == AMDemodSettings::MediumWave)
{
frequency = (frequency / 1000) * 1000;
const int spacing = 1000;
frequency = ((frequency + (spacing / 2)) / spacing) * spacing;
}
else if (m_settings.m_frequencyMode == AMDemodSettings::Airband25k)
{
frequency = (frequency / 25000) * 25000;
const int spacing = 25000;
frequency = ((frequency + (spacing / 2)) / spacing) * spacing;
}
else if (m_settings.m_frequencyMode == AMDemodSettings::Airband8K)
{
frequency = std::round((frequency / 8333) * 8333.33333333);
const double spacing = 25000.0 / 3.0; // 8.333kHz
double t = std::trunc((frequency + (spacing / 2.0)) / spacing);
frequency = static_cast<qint64>(std::round(t * spacing));
}
m_settings.m_inputFrequencyOffset = frequency - m_deviceCenterFrequency;