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RTTY demod: Fix so mark is high RF freq. Fix squelch.

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This commit is contained in:
Jon Beniston 2023-09-04 09:33:42 +01:00
parent a5214e3002
commit ba01da7827
2 changed files with 10 additions and 3 deletions
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7
plugins/channelrx/demodrtty/readme.md
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@ -79,7 +79,12 @@ Specifies whether bits are transmitted least-significant-bit first (LSB) or most
<h3>14: Mark/Space Frequency</h3> <h3>14: Mark/Space Frequency</h3>
When unchecked, the mark frequency is the higher frequency, when checked the space frequency is higher. When unchecked, the mark frequency is the higher RF frequency, when checked the space frequency is higher.
This should be unchecked when transmitter is using LSB AFSK and checked for USB AFSK and DWD
[1](https://www.dwd.de/EN/specialusers/shipping/broadcast_en/brodcast_rtty_1_052014.pdf?__blob=publicationFile&v=1)
[2](https://www.dwd.de/EN/specialusers/shipping/broadcast_en/broadcast_rtty_2_052014.pdf?__blob=publicationFile&v=1)
shipping weather broadcasts.
<h3>15: Suppress CR LF</h3> <h3>15: Suppress CR LF</h3>

6
plugins/channelrx/demodrtty/rttydemodsink.cpp
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@ -154,8 +154,8 @@ void RttyDemodSink::processOneSample(Complex &ci)
m_expIdx = (m_expIdx + 1) % m_expLength; m_expIdx = (m_expIdx + 1) % m_expLength;
//Complex exp = m_exp[m_sampleIdx]; //Complex exp = m_exp[m_sampleIdx];
//qDebug() << "IQ " << real(ci) << imag(ci); //qDebug() << "IQ " << real(ci) << imag(ci);
Complex corr1 = ci * exp; Complex corr1 = ci * std::conj(exp); // Conj is high/mark freq (as for matched filter, we need to time reverse and take conjugate)
Complex corr2 = ci * std::conj(exp); Complex corr2 = ci * exp; // Low/space freq
// Filter // Filter
Real abs1, abs2; Real abs1, abs2;
@ -238,6 +238,8 @@ void RttyDemodSink::processOneSample(Complex &ci)
m_clockCount = 0; m_clockCount = 0;
m_clock = false; m_clock = false;
m_cycleCount = 0; m_cycleCount = 0;
m_rssiMagSqSum = 0.0;
m_rssiMagSqCount = 0;
} }
} }
else else