public void PlotLatestData()
{
int frameSize = BUFFERSIZE;
var audioBytes = new byte[frameSize];
bwp.Read(audioBytes, 0, frameSize);
if (audioBytes.Length == 0)
{
return;
}
if (audioBytes[frameSize - 2] == 0)
{
return;
}
int BYTES_PER_POINT = 2;
int graphPointCount = audioBytes.Length / BYTES_PER_POINT;
double[] pcm = new double[graphPointCount];
double[] fft = new double[graphPointCount];
double[] fftReal = new double[graphPointCount / 2];
for (int i = 0; i < graphPointCount; i++)
{
short val = BitConverter.ToInt16(audioBytes, i * 2);
pcm[i] = val / Math.Pow(2, 16) * 200.0;
}
fft = FFT(pcm);
double pcmPointSpacingMs = RATE / 1000;
double fftMaxFreq = RATE / 2;
double fftPointSpacingHz = fftMaxFreq / graphPointCount;
Array.Copy(fft, fftReal, fftReal.Length);
PlotUC1.Clear();
PlotUC1.PlotSignal(pcm, pcmPointSpacingMs, Color.Blue);
PlotUC2.Clear();
PlotUC2.PlotSignal(fftReal, fftPointSpacingHz, Color.Blue);
if (needsAutoScaling)
{
PlotUC1.AxisAuto();
PlotUC2.AxisAuto();
needsAutoScaling = false;
}
numberOfDraws += 1;
Application.DoEvents();
}
public void SetupGraphLabels()
{
PlotUC1.fig.labelTitle = "Entrada Microfone";
PlotUC1.fig.labelY = "Amplitude (PCM)";
PlotUC1.fig.labelX = "Tempo (ms)";
PlotUC1.Redraw();
PlotUC2.fig.labelTitle = "FFT - Resultado";
PlotUC2.fig.labelY = "Power (raw)";
PlotUC2.fig.labelX = "Frequência (Hz)";
PlotUC2.Redraw();
}
