/* Stores the signals with the provided coordinates. */
private void Fingerprint(string beaconMac, string gatewayMac, int Rssi)
{
/* If the received signal is not from the beacon to be used fingerprinting, ignore it */
if (!FingerprintingSettings.Fingerprinting_BeaconMacAddress.Equals(beaconMac))
{
return;
}
/* Get gateway */
GatewayDao gwDao = new GatewayDao();
Gateway gateway = gwDao.GetGateway(gatewayMac);
FingerprintingDao dao = new FingerprintingDao();
Fingerprinting fingerprinting = new Fingerprinting()
{
GatewayId = gateway.GatewayId,
Rssi = Rssi,
Timestamp = DateTime.Now,
Xaxis = FingerprintingSettings.Fingerprinting_X,
Yaxis = FingerprintingSettings.Fingerprinting_Y,
EnvironmentId = FingerprintingSettings.Fingerprinting_EnvironmentId
};
dao.NewFingerprint(fingerprinting);
}
public void GetProminentFrequencies_Multiple_Frequencies(params int[] frequencies)
{
var sampleRate = 44100;
var fftSize = 1024;
var amplitude = 1;
var frequencyIndices = Enumerable.Range(0, frequencies.Length);
var sineWaves = frequencies
.Select(frequency => Generate.Sinusoidal(
sampleRate,
sampleRate,
frequency,
amplitude)
.ToList());
var samples = frequencyIndices
.Select(index =>
sineWaves
.Select(sineWave => sineWave[index])
.Sum())
.ToArray();
var prominentFrequencies = Fingerprinting.GetProminentFrequencies(samples, sampleRate);
var expectedBins = frequencies.Select(frequency => FrequencyToBin(sampleRate, fftSize, frequency));
Assert.All(prominentFrequencies, actualBins => Assert.Equal(expectedBins, actualBins));
}
/* Adds new fingerprinting record */
public Fingerprinting NewFingerprint(Fingerprinting fingerprinting)
{
using (IndoorPositioningContext db = new IndoorPositioningContext())
{
db.Fingerprintings.Add(fingerprinting);
db.SaveChanges();
return(fingerprinting);
}
}
public void GetProminentFrequencies_Single_Frequency(int frequency)
{
var sampleRate = 44100;
var fftSize = 1024;
var amplitude = 1;
var samples = Generate.Sinusoidal(sampleRate, sampleRate, frequency, amplitude);
var prominentFrequencies = Fingerprinting.GetProminentFrequencies(samples, sampleRate);
var expectedBin = FrequencyToBin(sampleRate, fftSize, frequency);
var expectedBins = new[] { expectedBin };
Assert.All(prominentFrequencies, actualBins => Assert.Contains(expectedBin, actualBins));
Assert.All(prominentFrequencies, actualBins => Assert.Equal(expectedBins, actualBins));
}
static void Main(string[] args)
{
// Analyser.AnalysePcmFile(440, "../js/signals/440.pcm");
// Analyser.AnalyseGenerated(440);
Fingerprinting.GetProminentFrequencies("../js/signals/almost-blue.pcm");
}