SampleApp.MainForm.source_NewFrame C# (CSharp) Method

        void source_NewFrame(object sender, NewFrameEventArgs eventArgs)
        {
            // We can start by converting the audio frame to a complex signal
            ComplexSignal signal = ComplexSignal.FromSignal(eventArgs.Signal);

            // If its needed,
            if (window != null)
            {
                // Apply the chosen audio window
                signal = window.Apply(signal, 0);
            }

            // Transform to the complex domain
            signal.ForwardFourierTransform();

            // Now we can get the power spectrum output and its
            // related frequency vector to plot our spectrometer.

            Complex[] channel = signal.GetChannel(0);
            double[] power = Accord.Audio.Tools.GetPowerSpectrum(channel);
            double[] freqv = Accord.Audio.Tools.GetFrequencyVector(signal.Length, signal.SampleRate);

            power[0] = 0; // zero DC
            float[] g = new float[power.Length];
            for (int i = 0; i < power.Length; i++)
                g[i] = (float)power[i];

            // Adjust the zoom according to the horizontal and vertical scrollbars.
            chart1.RangeX = new DoubleRange(freqv[0], freqv[freqv.Length - 1] / hScrollBar1.Value);
            chart1.RangeY = new DoubleRange(0f, Math.Pow(10, -vScrollBar1.Value));

            chart1.UpdateWaveform("fft", g);
        }