public static IEnumerable <LocalRange> PreparePeaks(this List <double> data, IProcessorModel <float> model)
{
var dataLength = data.Count;
for (int sampleLocation = NEIGHBOURS_COUNT; sampleLocation < data.Count - NEIGHBOURS_COUNT; sampleLocation++)
{
if (data[sampleLocation] < CONSIDERED_VOLUME)
{
continue;
}
var isPeak = true;
for (int sampleMove = 0; sampleMove < NEIGHBOURS_COUNT; sampleMove++)
{
//left
var leftNeighbour = sampleLocation - sampleMove;
if (data[leftNeighbour] < data[leftNeighbour - 1]) //data is represent with negative number
{
isPeak = false;
break;
}
//right
var rightNeighbour = sampleLocation + sampleMove;
if (data[rightNeighbour] < data[rightNeighbour + 1])
{
isPeak = false;
break;
}
}
if (isPeak)
{
yield return(model.RangeInit(sampleLocation, NEIGHBOURS_COUNT));
}
}
}
public static LocalRange RangeInit(this IProcessorModel <float> model, int peakIndex, int threshold)
{
var leftIndex = peakIndex - threshold;
var rightIndex = peakIndex + threshold;
var leftThreshold = FrequencyHelpers.GetFrequency(model.InputSamplesCount, leftIndex, model.SampleRate) * 2;
var rightThreshold = FrequencyHelpers.GetFrequency(model.InputSamplesCount, rightIndex, model.SampleRate) * 2;
var peak = FrequencyHelpers.GetFrequency(model.InputSamplesCount, peakIndex, model.SampleRate) * 2;
return(new LocalRange(GetZoomOptions(leftThreshold, rightThreshold, peak))
{
LeftThreshold = leftThreshold,
RightThreshold = rightThreshold,
Peak = peak
});
}
public FFTProcessorViewModel(IProcessorModel <float> model)
{
this.Model = model;
}
