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BFM demod: RDS decoder cleanup

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This commit is contained in:
f4exb 2015-12-12 19:53:24 +01:00
parent 1a9dca1632
commit 1be47adfef
2 changed files with 10 additions and 32 deletions
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39
plugins/channel/bfm/rdsdemod.cpp
View File

@ -24,6 +24,7 @@
const Real RDSDemod::m_pllBeta = 50; const Real RDSDemod::m_pllBeta = 50;
const int RDSDemod::m_udpSize = 1472; const int RDSDemod::m_udpSize = 1472;
const Real RDSDemod::m_fsc = 1187.5;
RDSDemod::RDSDemod() RDSDemod::RDSDemod()
{ {
@ -46,7 +47,6 @@ RDSDemod::RDSDemod()
m_parms.numsamples = 0; m_parms.numsamples = 0;
m_parms.loop_out = 0; m_parms.loop_out = 0;
m_parms.prev_loop = 0; m_parms.prev_loop = 0;
m_parms.prev_acc = 0; m_parms.prev_acc = 0;
m_parms.counter = 0; m_parms.counter = 0;
m_parms.reading_frame = 0; m_parms.reading_frame = 0;
@ -60,22 +60,13 @@ RDSDemod::~RDSDemod()
delete m_socket; delete m_socket;
} }
void RDSDemod::setSampleRate(int srate) void RDSDemod::setSampleRate(int srate) /// FIXME: fix rate for now
{ {
m_srate = srate;
} }
void RDSDemod::process(Real demod, Real pilot) void RDSDemod::process(Real demod, Real pilot)
{ {
m_sampleBuffer[m_sampleBufferIndex] = m_parms.lo_clock * m_parms.subcarr_bb[0]; // UDP debug
double fsc = 57000;
Real dPilot = pilot - m_pilotPrev;
if (dPilot < 0)
{
dPilot += 2 * M_PI;
}
if (m_sampleBufferIndex < m_udpSize) if (m_sampleBufferIndex < m_udpSize)
{ {
@ -89,26 +80,12 @@ void RDSDemod::process(Real demod, Real pilot)
// Subcarrier downmix & phase recovery // Subcarrier downmix & phase recovery
m_parms.subcarr_phi += 2 * M_PI * fsc * (1.0 / m_srate);
/*
if (m_parms.subcarr_phi > 48 * 2 * M_PI)
{
m_parms.subcarr_phi -= 48 * 2 * M_PI;
}*/
m_parms.subcarr_bb[0] = filter_lp_2400_iq(demod, 0); m_parms.subcarr_bb[0] = filter_lp_2400_iq(demod, 0);
//m_parms.subcarr_bb[1] = filter_lp_2400_iq(demod * std::sin(m_parms.subcarr_phi), 1);
m_parms.clock_phi += dPilot / 16.0;
m_parms.clock_phi = std::fmod(m_parms.clock_phi, 2 * M_PI);
m_parms.lo_clock = (m_parms.clock_phi < M_PI ? 1 : -1);
m_sampleBuffer[m_sampleBufferIndex] = m_parms.lo_clock * m_parms.subcarr_bb[0]; // UDP debug
// 1187.5 Hz clock // 1187.5 Hz clock
m_parms.clock_phi = (m_parms.subcarr_phi / 48.0) + m_parms.clock_offset; m_parms.subcarr_phi += (2 * M_PI * m_fsc) / (Real) m_srate;
m_parms.clock_phi = m_parms.subcarr_phi + m_parms.clock_offset;
// Clock phase recovery // Clock phase recovery
@ -124,6 +101,9 @@ void RDSDemod::process(Real demod, Real pilot)
m_parms.clock_offset -= 0.005 * m_parms.d_cphi; m_parms.clock_offset -= 0.005 * m_parms.d_cphi;
} }
m_parms.clock_phi = std::fmod(m_parms.clock_phi, 2 * M_PI);
m_parms.lo_clock = (m_parms.clock_phi < M_PI ? 1 : -1);
/* Decimate band-limited signal */ /* Decimate band-limited signal */
if (m_parms.numsamples % 8 == 0) if (m_parms.numsamples % 8 == 0)
{ {
@ -143,7 +123,6 @@ void RDSDemod::process(Real demod, Real pilot)
m_parms.prev_bb = m_parms.subcarr_bb[0]; m_parms.prev_bb = m_parms.subcarr_bb[0];
m_parms.prev_clock_phi = m_parms.clock_phi; m_parms.prev_clock_phi = m_parms.clock_phi;
m_prev = demod; m_prev = demod;
m_pilotPrev - pilot;
} }
void RDSDemod::biphase(Real acc, Real d_cphi) void RDSDemod::biphase(Real acc, Real d_cphi)
@ -167,7 +146,7 @@ void RDSDemod::biphase(Real acc, Real d_cphi)
} }
Real qua = (1.0 * abs(m_parms.tot_errs[0] - m_parms.tot_errs[1]) / (m_parms.tot_errs[0] + m_parms.tot_errs[1])) * 100; Real qua = (1.0 * abs(m_parms.tot_errs[0] - m_parms.tot_errs[1]) / (m_parms.tot_errs[0] + m_parms.tot_errs[1])) * 100;
qDebug("RDSDemod::biphase: frame: %d acc: %+6.3f errs: %3d %3d qual: %3.0f%% clk: %7.2f\n", qDebug("RDSDemod::biphase: frame: %d acc: %+6.3f errs: %3d %3d qual: %3.0f%% clk: %7.2f",
m_parms.reading_frame, m_parms.reading_frame,
acc, acc,
m_parms.tot_errs[0], m_parms.tot_errs[0],

3
plugins/channel/bfm/rdsdemod.h
View File

@ -74,8 +74,6 @@ private:
Real m_yw[1+1]; Real m_yw[1+1];
Real m_prev; Real m_prev;
Real m_pilotPrev;
int m_srate; int m_srate;
QUdpSocket *m_socket; QUdpSocket *m_socket;
@ -84,6 +82,7 @@ private:
static const int m_udpSize; static const int m_udpSize;
static const Real m_pllBeta; static const Real m_pllBeta;
static const Real m_fsc;
}; };
#endif /* PLUGINS_CHANNEL_BFM_RDSDEMOD_H_ */ #endif /* PLUGINS_CHANNEL_BFM_RDSDEMOD_H_ */