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

Chapter 6: MeasurementsStop Time (spectrum)The time (measured from the beginning of the signal) at which the spectrumsource interval ends. Units: seconds.Time Resolution (spectrogram, spectrum)The time grid resolution of the active spectrogram or spectrum. The horizontalspacing between gridpoints in a spectrogram, or the time interval between thebeginnings of successive frames whose spectra are averaged to obtain thedisplayed spectrum. (See also Hop Size.) Units: seconds.To Frequency (correlation)The upper frequency limit of the passband in a frequency-filtered correlation.(See also From Frequency) Units: Hz.Window Function (spectrogram, spectrum)The name of the window function applied to each STFT frame of data incalculating the spectrum or spectrogram.MeasurementsThis section briefly describes all of the measurements available for all fourmeasurement panels. Measurements are listed alphabetically. Eachmeasurement is labelled as to whether it is a point or range measurement. Thename of each measurement is followed by a parenthesized list of the panelsfor which the measurement is available.Note that dB measurements less than 0.1 dB are displayed as 0 dB.BEWARE!Amplitude measurements provided by Canary are meaningless unless the signalhas been properly calibrated!Amplitude Ceiling (spectrogram, spectrum)The amplitude ceiling of a spectrogram is controlled by the upper amplitudecursor in the signal’s spectrum pane. All amplitudes (i.e., intensities foracoustic signals, powers for electric signals) above the amplitude ceiling aredisplayed as black. (Some amplitudes below the ceiling may also be black.)The amplitude ceiling can be adjusted directly by moving the upperamplitude cursor in the spectrum, or indirectly using the spectrogrambrightness and contrast sliders on the command panel. Units: dB forlogarithmic spectrograms; watts/m 2 /Hz for quadratic spectrograms ofacoustic signals; watts/Hz for quadratic spectrograms of electric signals. Seealso Amplitude Floor, Dynamic Range.92 Canary 1.2 User’s Manual