User's Manual - Cornell Lab of Ornithology - Cornell University

Chapter 7: Correlationcorrelate, the file selection dialog box appears again, prompting this time forthe second file to be correlated. Again, you can choose either a file saved ondisk or a signal that is presently open.Waveforms to be correlated must have the same sampling rate. Spectrogramsto be correlated must match each other in all of the parameters specified in theSpectrogram Options dialog box, or an error will occur.Correlator optionsAfter you have selected both files to be correlated, the Correlator Optionsdialog box appears (Figure 7.6). If you selected waveforms or files thatcontain waveforms, the options dialog box lets you select whether tocorrelate the waveforms themselves or spectrograms of those waveforms(which the correlator will make from the selected waveforms). If you selectedspectrograms or files that contain spectrograms only, the Waveform choice isdimmed.Clicking the OK button initiates calculation of the correlation function, anddisplays a status window titled Correlator, which shows the progress of thecalculation. Clicking the Pause button in the status window makes the Cancelbutton available. Clicking the Cancel button aborts the calculation.Spectrogram optionsFigure 7.6. The Correlator Options dialog box.The spectrogram Options... button brings up the Spectrogram Options dialogbox that lets you specify the parameters for calculating the spectrogram(analysis and grid resolution, window function, amplitude scale, and noisefloor), as discussed in Chapter 3. If you selected waveforms in the file or viewselection dialog boxes, the options that you specify in this dialog box are usedto make new spectrograms that are then used as input to the correlator. If youselected spectrograms in the file or view selection dialogs, the spectrogramOptions... button displays the parameters of the first spectrogram that wasCanary 1.2 User’s Manual 113