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tuner: Use liquid for filter design

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Mike
2016-06-05 22:38:50 +01:00
parent 0ae5394e68
commit 19bc60a205
1 changed files with 9 additions and 4 deletions
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13
spectrogramplot.cpp
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@@ -25,8 +25,7 @@
#include <QPaintEvent>
#include <QPixmapCache>
#include <QRect>
#include <gnuradio/top_block.h>
#include <gnuradio/filter/firdes.h>
#include <liquid/liquid.h>
#include <cstdlib>
#include "util.h"
@@ -171,9 +170,15 @@ float SpectrogramPlot::getTunerPhaseInc()
std::vector<float> SpectrogramPlot::getTunerTaps()
{
float gain = pow(10.0f, powerMax / -10.0f);
float cutoff = tuner.deviation() / (float)fftSize;
return gr::filter::firdes::low_pass(gain, 1.0, cutoff, cutoff / 2);
float gain = pow(10.0f, powerMax / -10.0f);
auto atten = 60.0f;
auto len = estimate_req_filter_len(0.05f, atten);
auto taps = std::vector<float>(len);
liquid_firdes_kaiser(len, cutoff, atten, 0.0f, taps.data());
std::transform(taps.begin(), taps.end(), taps.begin(),
std::bind1st(std::multiplies<float>(), gain));
return taps;
}
int SpectrogramPlot::linesPerTile()