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TSpectrogram Class
TSpectrogram Constructor  TSpectrogram Methods  TSpectrogram Properties  TSpectrogram Members  Classes
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Form vectors from a list of TMarkList's.

Class Hierarchy
Dew_Signal_TSpectrogramDew_Signal_TSpectrogramDew_Signal_TSpectrogramDew_Signal_TSpectrogram
Syntax
C#
Visual Basic
public class TSpectrogram : TStaticSpectrumAnalyzer;
File

SignalAnalysis.cs

Remarks

Spectrogram expects a TSpectrumAnalyzer or descendant to be connected to its Input property. Each time the Pull method is called on component, the connected components are recalcuated and new spectrum is added to the list of spectrums within the component. There are various support routines avialable to help manage that data. Typical usage scenarios are like this (assuming single channel file): 

 

SignalRead.FileName := YourFile; SignalRead.OpenFile; SignalRead.RecordTimePosition := StartingTime; SpectrumAnalyzer.Input := SignalRead; Spectrogram.Input := SpectrumAnalyzer; Spectrogram.PullUntilEnd;//process entire file Spectrogram.SpectralTimeOffset := StartingTime; Spectrogram.SpectralSamplingFrequency := 1/SignalRead.FramesPerSecond;

 

Alternative: 

 

SignalRead.FileName := YourFile; SignalRead.OpenFile; SignalRead.RecordTimePosition := StartingTime; SpectrumAnalyzer.Input := SignalRead; SpectrumAnalyzer.Peaks.TraceMethod := ptAmpltHarmonics; Spectrogram.TraceOnly := true; Spectrogram.Input := SpectrumAnalyzer; Spectrogram.PullUntilEnd;//process entire file Spectrogram.Trace.EndTrace; Spectrogram.Trace.SpectralTimeOffset := StartingTime; Spectrogram.Trace.SpectralSamplingFrequency := 1/SignalRead.FramesPerSecond; // Spectrogram.Trace[i].Freq //TVec contains gathered data // Spectrogram.Trace[i].Amplt //TVec contains gathered data
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