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TSpectrogram Class
public | published | TSpectrogram Members | SignalAnalysis | Classes
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Class Hierarchy
SignalAnalysis_TSpectrogramSignalAnalysis_TSpectrogramSignalAnalysis_TSpectrogramSignalAnalysis_TSpectrogramSignalAnalysis_TSpectrogram
Pascal
TSpectrogram = class(TStaticSpectrumAnalyzer);
File
Description

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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