private int _nonStaticLsfMeanDownScaleFactor = 2; // 40D, 8.0 for other LSP order
#endregion
#region Construction
/// <summary>
/// Initializes a new instance of the FixedPointLspGaussianSerializer class.
/// </summary>
/// <param name="config">Gaussian configuration.</param>
internal FixedPointLspGaussianSerializer(GaussianConfig config) :
base(config)
{
Helper.ThrowIfNull(config);
// 32768, quantize delta (LSF[i+1]-LSP[i]) to 256, LSF (0, 0.5), so delta will depend on dimension count
// 4.0 if dimension >= 40D
// 8.0 if dimension < 40D
// Maximum range of LSF (16384 -> 0.5)
// 1024 = (256 * 4), maximum delta of LSF should be 1/16 of 0.5 in term of 40D
// 256 is what to quantize
// 1 is the smallest difference, to make sure the stabilize of the LPC filter.
if (Config.StaticVectorSize >= 40)
{
_staticLsfMeanDownScaleTo256Factor = 4;
_nonStaticLsfMeanDownScaleFactor = 2;
}
else
{
_staticLsfMeanDownScaleTo256Factor = 8;
_nonStaticLsfMeanDownScaleFactor = 4;
}
}
/// <summary>
/// Initializes a new instance of the FixedPointF0GaussianSerializer class.
/// </summary>
/// <param name="config">Gaussian configuration.</param>
internal FixedPointF0GaussianSerializer(GaussianConfig config) :
base(config)
{
}
/// <summary>
/// Initializes a new instance of the GaussianSerializer class.
/// </summary>
/// <param name="config">Gaussian configuration.</param>
protected GaussianSerializer(GaussianConfig config) :
this()
{
Helper.ThrowIfNull(config);
Config = config;
}
/// <summary>
/// Initializes a new instance of the MultipleSpaceDistributionGaussianSerializer class.
/// </summary>
/// <param name="config">Gaussian configuration.</param>
internal MultipleSpaceDistributionGaussianSerializer(GaussianConfig config) :
base(config)
{
}
/// <summary>
/// Create Gaussian serializer.
/// </summary>
/// <param name="config">Gaussian configuration.</param>
/// <param name="modelType">Model type.</param>
/// <param name="modelDistribution">Model distribution.</param>
/// <returns>Gaussian serializer.</returns>
public static GaussianSerializer Create(GaussianConfig config, HmmModelType modelType,
ModelDistributionType modelDistribution)
{
Helper.ThrowIfNull(config);
GaussianSerializer serializer = null;
if (config.IsFixedPoint)
{
if (modelType == HmmModelType.Lsp)
{
serializer = new FixedPointLspGaussianSerializer(config);
}
else if (modelType == HmmModelType.FundamentalFrequency)
{
serializer = new FixedPointF0GaussianSerializer(config);
}
else if (modelType == HmmModelType.Mbe)
{
serializer = new FixedPointMBEGaussianSerializer(config);
}
}
if (serializer == null)
{
if (modelDistribution == ModelDistributionType.Msd)
{
serializer = new MultipleSpaceDistributionGaussianSerializer(config);
}
else
{
serializer = new GaussianSerializer(config);
}
}
return serializer;
}
