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

Chapter 7: Correlation(a)(b)(c)peak = .902Figure 7.1. Spectrogram correlation between two renditions of a syllable typein the song of a northern mockingbird. Renditions (a) and (b) were producedduring a single song bout but separated by several minutes in time. (c)Correlation between spectrograms (a) and (b).(a)(b)(c)peak = .790, -20.8 mSFigure 7.2. Waveform correlation between a single syllable from amockingbird song simultaneously recorded at two different microphones. (a)Waveform from microphone 1. (b) Waveform from microphone 2, showingmore noise than the signal from microphone 1. (c) Complex envelope ofcorrelation between (a) and (b). The time delay of -20.8 mS indicates that thebird was 7.2 m closer to microphone 1 than to microphone 2 (assuming thespeed of sound is 344 m/S).Often the only point of interest in a correlation plot is the maximum value of108 Canary 1.2 User’s Manual