Hello,
I am currently developing an application of this type (spectrogram + audiostream) :
https://i.ibb.co/sPXMbf1/screenshot-framed-1.png
But i have one problem and one question :
Problem :
I generate the spectrum with this function :
@JvmStatic
fun generateSpectrum(shortArray: ShortArray) {
val sw = Stopwatch()
sw.start()
val buffer = ShortValues(shortArray)
val fft = Radix2FFT(buffer.size())
val fftData = DoubleValues()
fft.run(buffer, fftData)
fftData.setSize(fftSize)
val spectrogramItems = spectrogramValues.itemsArray
val fftItems = fftData.itemsArray
val spectrogramSize = spectrogramValues.size()
val fftSize = fftData.size()
val offset = spectrogramSize - fftSize
System.arraycopy(spectrogramItems, fftSize, spectrogramItems, 0, offset)
System.arraycopy(fftItems, 0, spectrogramItems, offset, fftSize)
spectrogramDS.updateZValues(spectrogramValues)
sw.stop()
Log.v(TAG, "SPECTRUM : " + sw.elapsedTime.toString())
}
It works very well to generate data from a shortarray (from microphone or saved shortarray). Except that, sometime when I launch replays, on average 1 in 10 replays will be very slow. As you can see, I put stopwatch to isolate the problems and it comes from this function. This function takes an average of 2 to 3 milliseconds in normal time to perform. When a replay is slow, this function takes on average between 6 and 8 milliseconds to execute.
Why? Do you have any ideas?
Question :
I can read data from a microphone as shown on the screenshot. I also know how to replay them by cleaning spectrogramDS and sending back the read data.
Now, let’s say I want to replay but in the form of :
What is not yet played is drawn in grey (so i don’t clean) and as the dataset plays back, it takes the same color as the recording. Basically, we see in advance the sound template that is being replayed but also where we are currently in the replay.
Is it possible ?
Thanks for you answer,
Wavely
- damien gaillard asked 5 years ago
- last active 5 years ago
Hi, i am developping a spectogram, screenshot : https://i.ibb.co/7CPTZbg/screenshot-framed.png
I get the same result from your showcase, now there is some things i want to change but can’t resolve to know how to :
– How can i change data direction to spread from left to right ? (currently right to left)
– How can i clear FastUniformHeatmapRenderableSeries ? Method clear doesn’t work
– How can we set width of FastUniformHeatmapRenderableSeries’s layout to be fixed to a specific seconds number ? (example : there is 10 seconds of data between left and right)
Thank you,
Wavely
- damien gaillard asked 5 years ago
- last active 5 years ago
Hi, i want to make something like that : https://i.ibb.co/617TmD2/screenshot-line.png
I have tried HorizontalLineAnnotation but i successed to have it only on bottom graph : https://i.ibb.co/qsCjjGd/screen-bot-graph.png
Here how i initialize my top graph :
@Override
public void initGraph(Context context) {
Log.d(TAG, "initGraphs");
SciChartSurface spectogramSciChart = new SciChartSurface(context);
spectogram.addView(spectogramSciChart);
xAxis = new NumericAxis(context);
xAxis.setAutoRange(AutoRange.Always);
xAxis.setDrawMinorTicks(false);
xAxis.setDrawMajorBands(false);
xAxis.setDrawMinorGridLines(false);
xAxis.setAxisAlignment(AxisAlignment.Left);
xAxis.setFlipCoordinates(true);
xAxis.setAxisTitle("Frequences (KHz)");
xAxis.setAxisTitleOrientation(AxisTitleOrientation.VerticalFlipped);
spectogramSciChart.getXAxes().add(xAxis);
yAxis = new NumericAxis(context);
yAxis.setVisibleRange(new DoubleRange(startSpectrogramRange, endSpectrogramRange));
yAxis.setDrawLabels(false);
yAxis.setDrawMinorTicks(false);
yAxis.setDrawMajorBands(false);
yAxis.setDrawMinorGridLines(false);
yAxis.setAxisAlignment(AxisAlignment.Bottom);
yAxis.setFlipCoordinates(true);
yAxis.setAxisTitleOrientation(AxisTitleOrientation.Horizontal);
spectogramSciChart.getYAxes().add(yAxis);
FastUniformHeatmapRenderableSeries f = new FastUniformHeatmapRenderableSeries();
scichartTools.getSpectrogramDS().setStartX(0f);
scichartTools.getSpectrogramDS().setStepX(0.9f);
f.setDataSeries(scichartTools.getSpectrogramDS());
f.setMaximum(100);
f.setMinimum(-30.0);
f.setColorMap(new ColorMap(
new int[]{ColorUtil.Transparent, ColorUtil.DarkBlue, ColorUtil.Purple, ColorUtil.Red, ColorUtil.Yellow, ColorUtil.White},
new float[]{0f, 0.0001f, 0.25f, 0.50f, 0.75f, 1f}
));
spectogramSciChart.getRenderableSeries().add(f);
scichartTools.getSpectrogramValues().setSize(scichartTools.getFftSize() * scichartTools.getBatchSize() * 2);
// I add the line but it's not displayed
HorizontalLineAnnotation horizontalLine = new HorizontalLineAnnotation(context);
horizontalLine.setHorizontalGravity(Gravity.FILL_HORIZONTAL);
horizontalLine.setY1(5f);
horizontalLine.setLabelValue("Label");
spectogramSciChart.getAnnotations().add(horizontalLine);
}
You can see at the bottom of the function that i added it, but it doesn’t work on this graph. Why ? Maybe the graph is drawing over my line ?
Thanks,
Best regards
- damien gaillard asked 5 years ago
- last active 5 years ago
