private unsafe void startButtonClick(object sender, EventArgs e)
{
rtlDevice = new Device(0);
rtlDevice.Frequency = frequency;
rtlDevice.SamplesAvailable += D_SamplesAvailable;
mainSpectrumAnalyzer.Frequency = rtlDevice.Frequency;
mainSpectrumAnalyzer.SampleRate = rtlDevice.SampleRate;
maxIqSamples = (int)(audioBufferInMs * rtlDevice.SampleRate / 1000);
_fftStream = new ComplexFifo(maxIqSamples);
_fftStreamDecimator = new ComplexFifo(maxIqSamples);
_fftStream.Open();
_fftStreamDecimator.Open();
decimator = new Decimator(rtlDevice.SampleRate, (uint)decimatorRatio, (uint)fftBins);
audioDecimator = new InlineFloatDecimator(rtlDevice.SampleRate / decimatorRatio, (uint)decimatorRatio);
audioSampleRate = (int)((rtlDevice.SampleRate / decimatorRatio) / decimatorRatio);
audioBuffer = DataBuffer.Create((audioBufferInMs * audioSampleRate / 1000), sizeof(float));
audioPtr = (float *)audioBuffer;
fmLpf = new FloatLPF(audioSampleRate, 22050, 127);
_audioFifo = new FloatFifo(16 * audioBufferInMs * audioSampleRate / 1000);
_audioFifo.Open();
_audioPlayer = new AudioPlayer(audioDeviceIdx, audioSampleRate, (uint)(audioBufferInMs * audioSampleRate / 1000), audioBufferNeeded);
sFFTDecimator = new SFFT((int)(fftBins / audioDecimator.DecimationFactor));
ifSpectrumAnalizer.Frequency = rtlDevice.Frequency;
ifSpectrumAnalizer.SampleRate = decimator.OutputSampleRate;
decimator.SamplesAvailable += Decimator_SamplesAvailable;
rtlDevice.UseRtlAGC = false;
rtlDevice.UseTunerAGC = false;
rtlDevice.VGAGain = vgaGain.Value = 3;
rtlDevice.LNAGain = lnaGain.Value = 7;
rtlDevice.MixerGain = mixerGain.Value = 3;
rtlDevice.Start();
dspHit = true;
_dspThread = new Thread(dspWork);
_dspThread.Start();
fftTimer.Enabled = true;
startButton.Enabled = false;
stopButton.Enabled = true;
Console.WriteLine("Receiving Samples now.");
}
public InlineFloatDecimator(long sampleRate, uint decimationFactor)
{
_lpf = new FloatLPF(sampleRate, sampleRate / (2 * decimationFactor), TAPS, ATTENUATION, decimationFactor);
_decimationFactor = decimationFactor;
}
public InlineFloatInterpolator(long sampleRate, uint interpolationFactor)
{
_lpf = new FloatLPF(sampleRate, (sampleRate * interpolationFactor) / 2, TAPS, ATTENUATION);
_interpolationFactor = interpolationFactor;
}
