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SignalUtils.Goertz Method ([In] TVec, double)
SignalUtils Class  SignalUtils Members  Dew.Signal.Units Namespace  Goertz Method  Example
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The Discrete Fourier transformation (DFT) for a given frequency.

Syntax
C#
Visual Basic
public static TCplx Goertz([In] TVec Src, double Freq);
Remarks

Calculates the Discrete Fourier transformation (DFT) for a given frequency. Goertz returns the DFT at the Frequency. Each value of the DFT computed by the Goertzel algorithm takes 2N+2 real multiplications and 4N real additions. FFT computes the DFT with N*log2(N) of real multiplications and additions.

Example

DFT of a single frequency. 

 

using Dew.Math; using Dew.Math.Editors; using Dew.Math.Units; using Dew.Signal; using Dew.Signal.Units; using Dew.Math.Tee; using Dew.Signal.Tee; private void button1_Click(object sender, EventArgs e) { Vector a = new Vector(0); SignalUtils.Tone(a,256,5.5/256,0,12.53,false); //generate a tone //And now detect the amplitude at non-integer frequency: MessageBox.Show("Amplitude = " + Math387.SampleToStr(Math387.CAbs(SignalUtils.Goertz(a,5.5/256))/128,0,15)); }
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