private double[] GetChannelsEnergy(IList <FilterProcessResult> channelsSignal)
{
var channelsRawEnergy = channelsSignal.Select(channel => SignalHelper.GetEnergy(channel.FilteredSignal, 0, channel.FilteredSignal.Length - 1));
double maxEnergy = channelsRawEnergy.Max(channel => Math.Abs(channel));
return(channelsRawEnergy.Select(channelEnergy => channelEnergy / maxEnergy).ToArray());
}
public SignalContainer GetSpeech(SignalContainer rawSignal)
{
SignalContainer singal = rawSignal.Copy();
singal.FrameSize = 100; //ToDo! Constant change
singal.FrameShift = singal.FrameSize;
List <double> framesEnergy = singal.GetFrames().Select(frame => SignalHelper.GetAverageEnergy(frame.Signal)).ToList();
double averageEnergy = framesEnergy.Average();
double[] flattenedFramesEnergy = ApplyMeanFilter(framesEnergy.ToArray(), 3);
SpeechBounds speechFramesBounds = GetSpeechBounds(flattenedFramesEnergy, averageEnergy);
var speechFrames = singal.GetFrames().Skip(speechFramesBounds.Start).Take(speechFramesBounds.Width);
double[] speechSignal = speechFrames.SelectMany(frame => frame.Signal).ToArray();
return(new SignalContainer(speechSignal)
{
FrameSize = rawSignal.FrameSize,
FrameShift = rawSignal.FrameShift
});
}