/// <summary>
/// Find the narest voice with the same password told in the voice file
/// </summary>
/// <param name="waveFileName">the path to input wave file</param>
/// <returns></returns>
public VoiceIdentity Identify(string waveFileName)
{
// obtain the password candidates told in the input voice
HashSet <string> passwords = new HashSet <string>(speechRecognizer.SpeechToText(waveFileName));
// initially set the result to null
VoiceIdentity nearest = null;
// find the identity with the same password and least distance meeting the threshold
double leastDistance = Double.MaxValue;
foreach (VoiceIdentity identity in identities.Values)
{
if (!passwords.Contains(identity.Password))
{
continue;
}
// calculate input file distance from the identity
double distance = identity.Distance(waveFileName);
// if it is more than threshold go to next identity
if (distance > threhold)
{
continue;
}
if (distance < leastDistance)
{
nearest = identity;
leastDistance = distance;
}
}
return(nearest);
}