BGC.Audio.FrequencyDomain Class Reference

Collection of common mathematical processes used in the Frequency-Domain. More...

Static Public Member Functions
static void	Populate (Complex64[] buffer, in ComplexCarrierTone carrierTone, double amplitudeFactor=1.0, int sideFreqCount=20)
static void	Populate (Complex64[] buffer, double frequency, Complex64 amplitude, int sideFreqCount=20)
static double	GetComplexSampleFrequency (int bufferSize, int sample)
static double	GetComplexFrequencySample (int bufferSize, double frequency)
static int	GetComplexFrequencyBin (int bufferSize, double frequency)

Properties
static double	SamplingRate [get, set]

Static Private Member Functions
static double	GetComplexNormalizedDeviation (int bufferSize, double frequency)
	Get f_Delta * T More...

Detailed Description

Collection of common mathematical processes used in the Frequency-Domain.

Definition at line 9 of file FrequencyDomain.cs.

Member Function Documentation

GetComplexFrequencyBin()

static int BGC.Audio.FrequencyDomain.GetComplexFrequencyBin ( int  bufferSize, double  frequency  )

static

Referenced by BGC.Audio.Filters.CarlileShuffler._Initialize(), and BGC.Audio.Visualization.SpectralDecomp.SpectralDecomp().

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GetComplexFrequencySample()

static double BGC.Audio.FrequencyDomain.GetComplexFrequencySample ( int  bufferSize, double  frequency  )

static

GetComplexNormalizedDeviation()

static double BGC.Audio.FrequencyDomain.GetComplexNormalizedDeviation ( int  bufferSize, double  frequency  )

staticprivate

Get f_Delta * T

GetComplexSampleFrequency()

static double BGC.Audio.FrequencyDomain.GetComplexSampleFrequency ( int  bufferSize, int  sample  )

static

Referenced by BGC.Audio.Visualization.Spectrogram.Decompose(), and BGC.Audio.Visualization.SpectralDecomp.SpectralDecomp().

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Populate() [1/2]

static void BGC.Audio.FrequencyDomain.Populate ( Complex64 []  buffer, in ComplexCarrierTone  carrierTone, double  amplitudeFactor = 1.0, int  sideFreqCount = 20  )

inlinestatic

Definition at line 13 of file FrequencyDomain.cs.

Referenced by BGC.Audio.Synthesis.NoiseAudioClip._Initialize(), BGC.Audio.Synthesis.STMAudioClip._Initialize(), BGC.Audio.AnalyticStreams.AnalyticNoiseStream.Initialize(), and BGC.Audio.Synthesis.FrequencyDomainToneComposer.Read().

        {
            Populate(
                buffer: buffer,
                frequency: carrierTone.frequency,
                amplitude: amplitudeFactor * carrierTone.amplitude,
                sideFreqCount: sideFreqCount);
        }

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Populate() [2/2]

static void BGC.Audio.FrequencyDomain.Populate ( Complex64 []  buffer, double  frequency, Complex64  amplitude, int  sideFreqCount = 20  )

inlinestatic

Definition at line 26 of file FrequencyDomain.cs.

References BGC.Mathematics.Complex64.FromPolarCoordinates(), and BGC.Mathematics.Complex64.Sqrt().

        {
            int bin = GetComplexFrequencyBin(
                bufferSize: buffer.Length,
                frequency: frequency);

            if (bin < 1 || bin > buffer.Length / 2)
            {
                //Skipping frequency as it's out of range
                return;
            }

            double normalizedDeviation = GetComplexNormalizedDeviation(
                bufferSize: buffer.Length,
                frequency: frequency);

            amplitude *= Math.Sqrt(buffer.Length);

            if (normalizedDeviation == 0.0)
            {
                //Perfect - No side terms
                buffer[bin] += amplitude;
                return;
            }

            amplitude *= (Math.Sin(Math.PI * normalizedDeviation) / Math.PI) *
                Complex64.FromPolarCoordinates(1.0, Math.PI * normalizedDeviation);

            for (int N = -sideFreqCount; N <= sideFreqCount; N++)
            {
                if (bin + N < 1 || bin + N > buffer.Length / 2)
                {
                    //Skip frequencies out of range
                    continue;
                }

                buffer[bin + N] += amplitude / (N - normalizedDeviation);
            }
        }

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Property Documentation

SamplingRate

double BGC.Audio.FrequencyDomain.SamplingRate

staticgetset

Definition at line 11 of file FrequencyDomain.cs.

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The documentation for this class was generated from the following file:

• Audio/FrequencyDomain.cs