public static AudioRecording Filter_IIR(AudioRecording audio, string filterName)
{
DSP_IIRFilter filter = new DSP_IIRFilter(filterName);
filter.ApplyIIRFilter(audio.WavReader.Samples, out var output);
int channels = audio.WavReader.Channels;
int bitsPerSample = audio.BitsPerSample;
int sampleRate = audio.SampleRate;
WavReader wr = new WavReader(output, channels, bitsPerSample, sampleRate);
var ar = new AudioRecording(wr);
return(ar);
}
/// <summary>
/// Do your analysis. This method is called once per segment (typically one-minute segments).
/// </summary>
/// <param name="audioRecording"></param>
/// <param name="configuration"></param>
/// <param name="segmentStartOffset"></param>
/// <param name="getSpectralIndexes"></param>
/// <param name="outputDirectory"></param>
/// <param name="imageWidth"></param>
/// <returns></returns>
public override RecognizerResults Recognize(AudioRecording audioRecording, Config configuration, TimeSpan segmentStartOffset, Lazy <IndexCalculateResult[]> getSpectralIndexes, DirectoryInfo outputDirectory, int?imageWidth)
{
const double minAmplitudeThreshold = 0.1;
const int percentile = 5;
const double scoreThreshold = 0.3;
const bool doFiltering = true;
const int windowWidth = 1024;
const int signalBuffer = windowWidth * 2;
//string path = @"C:\SensorNetworks\WavFiles\Freshwater\savedfortest.wav";
//audioRecording.Save(path); // this does not work
int sr = audioRecording.SampleRate;
int nyquist = audioRecording.Nyquist;
// Get a value from the config file - with a backup default
//int minHz = (int?)configuration[AnalysisKeys.MinHz] ?? 600;
// Get a value from the config file - with no default, throw an exception if value is not present
//int maxHz = ((int?)configuration[AnalysisKeys.MaxHz]).Value;
// Get a value from the config file - without a string accessor, as a double
//double someExampleSettingA = (double?)configuration.someExampleSettingA ?? 0.0;
// common properties
//string speciesName = (string)configuration[AnalysisKeys.SpeciesName] ?? "<no species>";
//string abbreviatedSpeciesName = (string)configuration[AnalysisKeys.AbbreviatedSpeciesName] ?? "<no.sp>";
// min score for an acceptable event
double eventThreshold = (double)configuration.GetDoubleOrNull(AnalysisKeys.EventThreshold);
// get samples
var samples = audioRecording.WavReader.Samples;
double[] bandPassFilteredSignal = null;
if (doFiltering)
{
// high pass filter
int windowLength = 71;
double[] highPassFilteredSignal;
DSP_IIRFilter.ApplyMovingAvHighPassFilter(samples, windowLength, out highPassFilteredSignal);
//DSP_IIRFilter filter2 = new DSP_IIRFilter("Chebyshev_Highpass_400");
//int order2 = filter2.order;
//filter2.ApplyIIRFilter(samples, out highPassFilteredSignal);
// Amplify 40dB and clip to +/-1.0;
double factor = 100; // equiv to 20dB
highPassFilteredSignal = DspFilters.AmplifyAndClip(highPassFilteredSignal, factor);
//low pass filter
string filterName = "Chebyshev_Lowpass_5000, scale*5";
DSP_IIRFilter filter = new DSP_IIRFilter(filterName);
int order = filter.order;
//System.LoggedConsole.WriteLine("\nTest " + filterName + ", order=" + order);
filter.ApplyIIRFilter(highPassFilteredSignal, out bandPassFilteredSignal);
}
else // do not filter because already filtered - using Chris's filtered recording
{
bandPassFilteredSignal = samples;
}
// calculate an amplitude threshold that is above Nth percentile of amplitudes in the subsample
int[] histogramOfAmplitudes;
double minAmplitude;
double maxAmplitude;
double binWidth;
int window = 66;
Histogram.GetHistogramOfWaveAmplitudes(bandPassFilteredSignal, window, out histogramOfAmplitudes, out minAmplitude, out maxAmplitude, out binWidth);
int percentileBin = Histogram.GetPercentileBin(histogramOfAmplitudes, percentile);
double amplitudeThreshold = (percentileBin + 1) * binWidth;
if (amplitudeThreshold < minAmplitudeThreshold)
{
amplitudeThreshold = minAmplitudeThreshold;
}
bool doAnalysisOfKnownExamples = true;
if (doAnalysisOfKnownExamples)
{
// go to fixed location to check
//1:02.07, 1:07.67, 1:12.27, 1:12.42, 1:12.59, 1:12.8, 1.34.3, 1:35.3, 1:40.16, 1:50.0, 2:05.9, 2:06.62, 2:17.57, 2:21.0
//2:26.33, 2:43.07, 2:43.15, 3:16.55, 3:35.09, 4:22.44, 4:29.9, 4:42.6, 4:51.48, 5:01.8, 5:21.15, 5:22.72, 5:32.37, 5.36.1,
//5:42.82, 6:03.5, 6:19.93, 6:21.55, 6:42.0, 6:42.15, 6:46.44, 7:12.17, 7:42.65, 7:45.86, 7:46.18, 7:52.38, 7:59.11, 8:10.63,
//8:14.4, 8:14.63, 8_15_240, 8_46_590, 8_56_590, 9_25_77, 9_28_94, 9_30_5, 9_43_9, 10_03_19, 10_24_26, 10_24_36, 10_38_8,
//10_41_08, 10_50_9, 11_05_13, 11_08_63, 11_44_66, 11_50_36, 11_51_2, 12_04_93, 12_10_05, 12_20_78, 12_27_0, 12_38_5,
//13_02_25, 13_08_18, 13_12_8, 13_25_24, 13_36_0, 13_50_4, 13_51_2, 13_57_87, 14_15_00, 15_09_74, 15_12_14, 15_25_79
//double[] times = { 2.2, 26.589, 29.62 };
//double[] times = { 2.2, 3.68, 10.83, 24.95, 26.589, 27.2, 29.62 };
//double[] times = { 2.2, 3.68, 10.83, 24.95, 26.589, 27.2, 29.62, 31.39, 62.1, 67.67, 72.27, 72.42, 72.59, 72.8, 94.3, 95.3,
// 100.16, 110.0, 125.9, 126.62, 137.57, 141.0, 146.33, 163.07, 163.17, 196.55, 215.09, 262.44, 269.9, 282.6,
// 291.48, 301.85, 321.18, 322.72, 332.37, 336.1, 342.82, 363.5, 379.93, 381.55, 402.0, 402.15, 406.44, 432.17,
// 462.65, 465.86, 466.18, 472.38, 479.14, 490.63, 494.4, 494.63, 495.240, 526.590, 536.590, 565.82, 568.94,
// 570.5, 583.9, 603.19, 624.26, 624.36, 638.8, 641.08, 650.9, 65.13, 68.63, 704.66,
// 710.36, 711.2, 724.93, 730.05, 740.78, 747.05, 758.5, 782.25, 788.18, 792.8,
// 805.24, 816.03, 830.4, 831.2, 837.87, 855.02, 909.74, 912.14, 925.81 };
var filePath = new FileInfo(@"C:\SensorNetworks\WavFiles\Freshwater\GruntSummaryRevisedAndEditedByMichael.csv");
List <CatFishCallData> data = Csv.ReadFromCsv <CatFishCallData>(filePath, true).ToList();
//var catFishCallDatas = data as IList<CatFishCallData> ?? data.ToList();
int count = data.Count();
var subSamplesDirectory = outputDirectory.CreateSubdirectory("testSubsamples_5000LPFilter");
//for (int t = 0; t < times.Length; t++)
foreach (var fishCall in data)
{
//Image bmp1 = IctalurusFurcatus.AnalyseLocation(bandPassFilteredSignal, sr, times[t], windowWidth);
// use following line where using time in seconds
//int location = (int)Math.Round(times[t] * sr); //assume location points to start of grunt
//double[] subsample = DataTools.Subarray(bandPassFilteredSignal, location - signalBuffer, 2 * signalBuffer);
// use following line where using sample
int location1 = fishCall.Sample / 2; //assume Chris's sample location points to centre of grunt. Divide by 2 because original recording was 44100.
int location = (int)Math.Round(fishCall.TimeSeconds * sr); //assume location points to centre of grunt
double[] subsample = DataTools.Subarray(bandPassFilteredSignal, location - signalBuffer, 2 * signalBuffer);
// calculate an amplitude threshold that is above 95th percentile of amplitudes in the subsample
//int[] histogramOfAmplitudes;
//double minAmplitude;
//double maxAmplitude;
//double binWidth;
//int window = 70;
//int percentile = 90;
//Histogram.GetHistogramOfWaveAmplitudes(subsample, window, out histogramOfAmplitudes, out minAmplitude, out maxAmplitude, out binWidth);
//int percentileBin = Histogram.GetPercentileBin(histogramOfAmplitudes, percentile);
//double amplitudeThreshold = (percentileBin + 1) * binWidth;
//if (amplitudeThreshold < minAmplitudeThreshold) amplitudeThreshold = minAmplitudeThreshold;
double[] scores1 = AnalyseWaveformAtLocation(subsample, amplitudeThreshold, scoreThreshold);
string title1 = $"scores={fishCall.Timehms}";
Image bmp1 = GraphsAndCharts.DrawGraph(title1, scores1, subsample.Length, 300, 1);
//bmp1.Save(path1.FullName);
string title2 = $"tStart={fishCall.Timehms}";
Image bmp2 = GraphsAndCharts.DrawWaveform(title2, subsample, 1);
var path1 = subSamplesDirectory.CombineFile($"scoresForTestSubsample_{fishCall.TimeSeconds}secs.png");
//var path2 = subSamplesDirectory.CombineFile($@"testSubsample_{times[t]}secs.wav.png");
Image[] imageList = { bmp2, bmp1 };
Image bmp3 = ImageTools.CombineImagesVertically(imageList);
bmp3.Save(path1.FullName);
//write wave form to txt file for later work in XLS
//var path3 = subSamplesDirectory.CombineFile($@"testSubsample_{times[t]}secs.wav.csv");
//signalBuffer = 800;
//double[] subsample2 = DataTools.Subarray(bandPassFilteredSignal, location - signalBuffer, 3 * signalBuffer);
//FileTools.WriteArray2File(subsample2, path3.FullName);
}
}
int signalLength = bandPassFilteredSignal.Length;
// count number of 1000 sample segments
int blockLength = 1000;
int blockCount = signalLength / blockLength;
int[] indexOfMax = new int[blockCount];
double[] maxInBlock = new double[blockCount];
for (int i = 0; i < blockCount; i++)
{
double max = -2.0;
int blockStart = blockLength * i;
for (int s = 0; s < blockLength; s++)
{
double absValue = Math.Abs(bandPassFilteredSignal[blockStart + s]);
if (absValue > max)
{
max = absValue;
maxInBlock[i] = max;
indexOfMax[i] = blockStart + s;
}
}
}
// transfer max values to a list
var indexList = new List <int>();
for (int i = 1; i < blockCount - 1; i++)
{
// only find the blocks that contain a max value that is > neighbouring blocks
if (maxInBlock[i] > maxInBlock[i - 1] && maxInBlock[i] > maxInBlock[i + 1])
{
indexList.Add(indexOfMax[i]);
}
//ALTERNATIVELY
// look at max in each block
//indexList.Add(indexOfMax[i]);
}
// now process neighbourhood of each max
int binCount = windowWidth / 2;
FFT.WindowFunc wf = FFT.Hamming;
var fft = new FFT(windowWidth, wf);
int maxHz = 1000;
double hzPerBin = nyquist / (double)binCount;
int requiredBinCount = (int)Math.Round(maxHz / hzPerBin);
// init list of events
List <AcousticEvent> events = new List <AcousticEvent>();
double[] scores = new double[signalLength]; // init of score array
int id = 0;
foreach (int location in indexList)
{
//System.LoggedConsole.WriteLine("Location " + location + ", id=" + id);
int start = location - binCount;
if (start < 0)
{
continue;
}
int end = location + binCount;
if (end >= signalLength)
{
continue;
}
double[] subsampleWav = DataTools.Subarray(bandPassFilteredSignal, start, windowWidth);
var spectrum = fft.Invoke(subsampleWav);
// convert to power
spectrum = DataTools.SquareValues(spectrum);
spectrum = DataTools.filterMovingAverageOdd(spectrum, 3);
spectrum = DataTools.normalise(spectrum);
var subBandSpectrum = DataTools.Subarray(spectrum, 1, requiredBinCount); // ignore DC in bin zero.
// now do some tests on spectrum to determine if it is a candidate grunt
bool eventFound = false;
double[] scoreArray = CalculateScores(subBandSpectrum, windowWidth);
double score = scoreArray[0];
if (score > scoreThreshold)
{
eventFound = true;
}
if (eventFound)
{
for (int i = location - binCount; i < location + binCount; i++)
{
scores[location] = score;
}
var startTime = TimeSpan.FromSeconds((location - binCount) / (double)sr);
string startLabel = startTime.Minutes + "." + startTime.Seconds + "." + startTime.Milliseconds;
Image image4 = GraphsAndCharts.DrawWaveAndFft(subsampleWav, sr, startTime, spectrum, maxHz * 2, scoreArray);
var path4 = outputDirectory.CreateSubdirectory("subsamples").CombineFile($@"subsample_{location}_{startLabel}.png");
image4.Save(path4.FullName);
// have an event, store the data in the AcousticEvent class
double duration = 0.2;
int minFreq = 50;
int maxFreq = 1000;
var anEvent = new AcousticEvent(segmentStartOffset, startTime.TotalSeconds, duration, minFreq, maxFreq);
anEvent.Name = "grunt";
//anEvent.Name = DataTools.WriteArrayAsCsvLine(subBandSpectrum, "f4");
anEvent.Score = score;
events.Add(anEvent);
}
id++;
}
// make a spectrogram
var config = new SonogramConfig
{
NoiseReductionType = NoiseReductionType.Standard,
NoiseReductionParameter = configuration.GetDoubleOrNull(AnalysisKeys.NoiseBgThreshold) ?? 0.0,
};
var sonogram = (BaseSonogram) new SpectrogramStandard(config, audioRecording.WavReader);
//// when the value is accessed, the indices are calculated
//var indices = getSpectralIndexes.Value;
//// check if the indices have been calculated - you shouldn't actually need this
//if (getSpectralIndexes.IsValueCreated)
//{
// // then indices have been calculated before
//}
var plot = new Plot(this.DisplayName, scores, eventThreshold);
return(new RecognizerResults()
{
Events = events,
Hits = null,
//ScoreTrack = null,
Plots = plot.AsList(),
Sonogram = sonogram,
});
}