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

Chapter 6: Measurements(Point) For a spectrogram, the energy flux density per hertz at the time andfrequency indicated by the position of the mouse pointer. For a spectrum, theenergy flux density per hertz at the frequency indicated by the horizontalposition of the mouse pointer. If the spectrogram or spectrum is logarithmic,the value shown (in dB) is the “energy flux density spectrum level”; for aquadratic spectrogram or spectrum, units are joules/m 2 /Hz. In a quadraticspectrogram or spectrum, Energy Flux Density/Hz is equal to Intensity/Hztimes the frame length (in seconds). For electric signals, Energy FluxDensity/Hz is replaced by Energy/Hz.Frequency (spectrogram, spectrum)(Point) For a spectrogram, the frequency corresponding to the vertical positionof the mouse pointer. For a spectrum, the frequency corresponding to thehorizontal position of the mouse pointer. Units: Hz.High Frequency (spectrogram, spectrum)(Range) The upper frequency limit of the selected region. Units: Hz.Instantaneous Pressure (acoustic waveform)(Point) The pressure at the point in time indicated by the horizontal positionof the mouse pointer. Units: pascals. (See also Instantaneous Voltage.)Instantaneous Voltage (electric waveform)(Point) The voltage at the point in time indicated by the horizontal position ofthe mouse pointer. (See also Instantaneous Pressure.)Intensity per Hertz (acoustic spectrogram, spectrum)(Point) For a spectrogram, the intensity per hertz at the time and frequencyindicated by the position of the mouse pointer. For a spectrum, the intensityper hertz at the frequency indicated by the horizontal position of the mousepointer. If the spectrogram or spectrum is logarithmic, the value shown (in dB)is the “intensity spectrum level”; for a quadratic spectrogram or spectrum,units are watts/m 2 /Hz. In a quadratic spectrogram or spectrum, Intensity/Hzis equal to Energy Flux Density/Hz divided by the frame length (in seconds).For electric signals, Intensity/Hz is replaced by Power/Hz.Low Frequency (spectrogram, spectrum)(Range) The lower frequency limit of the selected region. Units: Hz.Number of Frames (spectrogram)(Range) The number of whole overlapping STFT frames included in theselection.Number of Samples (waveform)Canary 1.2 User’s Manual 97