The "raised cosine" window is a family of temporal windows, from which the most known representative members are the Hann and Hamming windows.
References: Wikipedia, The Free Encyclopedia. Window function. Available on: http://en.wikipedia.org/wiki/Window_function
public void waveInput() { writeHeaderForARFF(); for (int i = 0; i < audioFileName.Length; i++) { string type; string name; setTypeAndName(audioFileName[i], out type, out name); Accord.Audio.Formats.WaveDecoder currentWav = new Accord.Audio.Formats.WaveDecoder(audioFileName[i]); //Used for time Domain Signal timeDomain = currentWav.Decode(); //Creates an array of time domain samples for use in calculation of RootMeanSquare aka AverageEnergy float[] energyArray = new float[timeDomain.Samples]; timeDomain.CopyTo(energyArray); //average energy for the current wav file double averageEnergy = Accord.Audio.Tools.RootMeanSquare(energyArray); //ZCR for the current wav file double zeroCrossingRate = zeroCrossingRateMethod(timeDomain); Accord.Audio.Windows.RaisedCosineWindow window = Accord.Audio.Windows.RaisedCosineWindow.Hamming(1024); Signal[] windows = timeDomain.Split(window, 512); //Used for Frequency Domain ComplexSignal[] tempFrequency = windows.Apply(ComplexSignal.FromSignal); tempFrequency.ForwardFourierTransform(); ComplexSignal curComplex = tempFrequency[0]; double[] power = { }; double[] magnitudes = { }; double[] freq = { }; var length = curComplex.Length / (2 + 1); double[] meanPower = new double[length]; double[] meanMagnitudes = new double[length]; createFrequencyArray(tempFrequency, curComplex, out power, out magnitudes, out freq, out meanPower, out meanMagnitudes); //Spectral Centrois for the current wav file double spectralCentroid = meanMagnitudes.Zip(freq, (m, f) => m * f).Sum() / meanMagnitudes.Sum(); //double spectralCentroid = spectralCentroidMethod(tempFrequency); //Writes data to arff file writeARFF(name, averageEnergy, zeroCrossingRate, spectralCentroid, type); } }