/// <summary>
/// Load the summed signal into a wav file, can be saved or played
/// </summary>
/// <param name="workbookSourceSignal"></param>
private void CreateWavFile(Signal workbookSourceSignal)
{
int sampleRate = (int)workbookSourceSignal.SamplingHZ;
SignalWaveFile = new WaveFile(sampleRate, 16, 1);
// Convert amplitudes to 16 bit PCM values
// First find max value, set that to be 100%
// Scale all other values against that max, convert each value to 16 bit int. Biased to 32767 for Y zero point
List <double> signalValues = workbookSourceSignal.Samples;
double peakValue = signalValues.Max();
if (Math.Abs(signalValues.Min()) > peakValue)
{
peakValue = Math.Abs(signalValues.Min());
}
foreach (double value in signalValues)
{
double percentage = value / peakValue;
double pcmVal = (percentage * 32767) + 32767; // Bias at midpoint of 16 bit range
SignalWaveFile.AddSample(pcmVal);
}
}
/// <summary>
/// Generates the specified dual-tone multi-frequencies <paramref name="repeatCount"/> times storing them in the specified <see cref="WaveFile"/>.
/// </summary>
/// <param name="destination"><see cref="WaveFile"/> used to store generated dual-tone multi-frequencies.</param>
/// <param name="tones">Dual-tone multi-frequencies to generate.</param>
/// <param name="volume">Volume of generated dual-tones as a percentage (0 to 1).</param>
/// <param name="repeatCount">Number of times to repeat each tone.</param>
/// <exception cref="ArgumentOutOfRangeException">Value must be expressed as a fractional percentage between zero and one.</exception>
/// <exception cref="InvalidOperationException"><see cref="DTMF"/> only generated for <see cref="WaveFile"/> with a sample rate of 8, 16, 24, 32 or 64 bits per sample.</exception>
public static void Generate(WaveFile destination, DTMF[] tones, double volume, int repeatCount)
{
if (volume < 0.0D || volume > 1.0D)
{
throw new ArgumentOutOfRangeException(nameof(volume), "Value must be expressed as a fractional percentage between zero and one");
}
double amplitude = destination.AmplitudeScalar * volume;
// Iterate through each repeat count
for (int x = 0; x < repeatCount; x++)
{
// Interate through each tone
foreach (DTMF tone in tones)
{
// Iterate through each sample for total DTMF duration
for (long y = 0; y < tone.Duration * destination.SampleRate; y++)
{
// Compute frequencies of DTMF at given time and add to wave file
destination.AddSample(ComputeFrequencies(tone, y, destination.SampleRate) * amplitude);
}
}
}
}
/// <summary>
/// Generates the specified dual-tone multi-frequencies <paramref name="repeatCount"/> times storing them in the specified <see cref="WaveFile"/>.
/// </summary>
/// <param name="destination"><see cref="WaveFile"/> used to store generated dual-tone multi-frequencies.</param>
/// <param name="tones">Dual-tone multi-frequencies to generate.</param>
/// <param name="volume">Volume of generated dual-tones as a percentage (0 to 1).</param>
/// <param name="repeatCount">Number of times to repeat each tone.</param>
/// <exception cref="ArgumentOutOfRangeException">Value must be expressed as a fractional percentage between zero and one.</exception>
/// <exception cref="InvalidOperationException"><see cref="DTMF"/> only generated for <see cref="WaveFile"/> with a sample rate of 8, 16, 24, 32 or 64 bits per sample.</exception>
public static void Generate(WaveFile destination, DTMF[] tones, double volume, int repeatCount)
{
if (volume < 0.0D || volume > 1.0D)
throw new ArgumentOutOfRangeException("volume", "Value must be expressed as a fractional percentage between zero and one");
double amplitude = destination.AmplitudeScalar * volume;
// Iterate through each repeat count
for (int x = 0; x < repeatCount; x++)
{
// Interate through each tone
foreach (DTMF tone in tones)
{
// Iterate through each sample for total DTMF duration
for (long y = 0; y < tone.Duration * destination.SampleRate; y++)
{
// Compute frequencies of DTMF at given time and add to wave file
destination.AddSample(DTMF.ComputeFrequencies(tone, y, destination.SampleRate) * amplitude);
}
}
}
}
