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SpectrogramPlot: Ignore negative frequencies for real signals

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This commit is contained in:
Mike Walters
2020-03-06 21:15:00 +00:00
parent b5fe6cb035
commit e215f57b37
1 changed files with 16 additions and 4 deletions
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20
spectrogramplot.cpp
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@@ -51,6 +51,9 @@ SpectrogramPlot::SpectrogramPlot(std::shared_ptr<SampleSource<std::complex<float
void SpectrogramPlot::invalidateEvent()
{
// HACK: this makes sure we update the height for real signals (as InputSource is passed here before the file is opened)
setFFTSize(fftSize);
pixmapCache.clear();
fftCache.clear();
emit repaint();
@@ -71,6 +74,8 @@ void SpectrogramPlot::paintFrequencyScale(QPainter &painter, QRect &rect)
int y = rect.y();
int plotHeight = rect.height();
if (inputSource->realSignal())
plotHeight *= 2;
double bwPerPixel = (double)sampleRate / plotHeight;
int tickHeight = 50;
@@ -95,7 +100,8 @@ void SpectrogramPlot::paintFrequencyScale(QPainter &painter, QRect &rect)
int tickpy = plotHeight / 2 - tick / bwPerPixel + y;
int tickny = plotHeight / 2 + tick / bwPerPixel + y;
painter.drawLine(0, tickny, 30, tickny);
if (!inputSource->realSignal())
painter.drawLine(0, tickny, 30, tickny);
painter.drawLine(0, tickpy, 30, tickpy);
if (tick != 0) {
@@ -109,7 +115,8 @@ void SpectrogramPlot::paintFrequencyScale(QPainter &painter, QRect &rect)
snprintf(buf, sizeof(buf), "-%d Hz", tick);
}
painter.drawText(5, tickny - 5, buf);
if (!inputSource->realSignal())
painter.drawText(5, tickny - 5, buf);
buf[0] = ' ';
painter.drawText(5, tickpy + 15, buf);
@@ -128,7 +135,8 @@ void SpectrogramPlot::paintFrequencyScale(QPainter &painter, QRect &rect)
int tickpy = plotHeight / 2 - tick / bwPerPixel + y;
int tickny = plotHeight / 2 + tick / bwPerPixel + y;
painter.drawLine(0, tickny, 3, tickny);
if (!inputSource->realSignal())
painter.drawLine(0, tickny, 3, tickny);
painter.drawLine(0, tickpy, 3, tickpy);
tick += bwPerTick;
@@ -286,7 +294,11 @@ void SpectrogramPlot::setFFTSize(int size)
window[i] = 0.5f * (1.0f - cos(Tau * i / (fftSize - 1)));
}
setHeight(fftSize);
if (inputSource->realSignal()) {
setHeight(fftSize/2);
} else {
setHeight(fftSize);
}
auto dev = tuner.deviation();
auto centre = tuner.centre();
tuner.setHeight(height());