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tuner: Hook up tuner overlay to modify Xlating FIR filter taps/centre

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Mike Walters
2016-03-19 18:54:44 +00:00
parent 51a21034c7
commit 202cf82db2
3 changed files with 25 additions and 6 deletions
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24
plotview.cpp
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@@ -26,18 +26,19 @@
#include <gnuradio/analog/quadrature_demod_cf.h>
#include <gnuradio/blocks/multiply_const_cc.h>
#include <gnuradio/filter/firdes.h>
#include <gnuradio/filter/freq_xlating_fir_filter_ccf.h>
#include "grsamplebuffer.h"
#include "memory_sink.h"
#include "memory_source.h"
PlotView::PlotView(InputSource *input) : cursors(this), viewRange({0, 0})
PlotView::PlotView(InputSource *input) : cursors(this), tuner(this), viewRange({0, 0})
{
mainSampleSource = input;
setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
enableCursors(false);
viewport()->installEventFilter(&cursors);
connect(&cursors, SIGNAL(cursorsMoved()), this, SLOT(cursorsMoved()));
viewport()->installEventFilter(&tuner);
connect(&tuner, &Tuner::tunerMoved, this, &PlotView::tunerMoved);
spectrogramPlot = new SpectrogramPlot(mainSampleSource);
plots.emplace_back(spectrogramPlot);
@@ -59,10 +60,10 @@ TracePlot* PlotView::createIQPlot(SampleSource<std::complex<float>> *src)
float centre = -0.05; //(selectionFreq.first + selectionFreq.second) / 2;
float cutoff = 0.02; //std::abs(selectionFreq.first - centre);
auto lp_taps = gr::filter::firdes::low_pass(1.0, 1.0, cutoff, cutoff / 2);
auto filter = gr::filter::freq_xlating_fir_filter_ccf::make(1, lp_taps, centre, 1.0);
plotFilter = gr::filter::freq_xlating_fir_filter_ccf::make(1, lp_taps, centre, 1.0);
iq_tb->connect(iq_mem_source, 0, filter, 0);
iq_tb->connect(filter, 0, multiply, 0);
iq_tb->connect(iq_mem_source, 0, plotFilter, 0);
iq_tb->connect(plotFilter, 0, multiply, 0);
iq_tb->connect(multiply, 0, iq_mem_sink, 0);
} else {
iq_tb->connect(iq_mem_source, 0, multiply, 0);
@@ -200,6 +201,7 @@ void PlotView::paintEvent(QPaintEvent *event)
PLOT_LAYER(paintFront);
if (cursorsEnabled)
cursors.paintFront(painter, rect, viewRange);
tuner.paintFront(painter, rect, viewRange);
#undef PLOT_LAYER
}
@@ -228,6 +230,18 @@ void PlotView::scrollContentsBy(int dx, int dy)
updateView();
}
void PlotView::tunerMoved()
{
float centre = 0.5f - tuner.centre() / (float)fftSize;
float cutoff = tuner.deviation() / (float)fftSize;
qDebug() << "centre: " << centre << " cutoff: " << cutoff;
auto lp_taps = gr::filter::firdes::low_pass(1.0, 1.0, cutoff, cutoff / 2);
plotFilter->set_center_freq(centre);
plotFilter->set_taps(lp_taps);
viewport()->update();
}
void PlotView::updateView(bool reCenter)
{
// Store old view for recentering