Spectrograms of various killer whale calls, labeled by call type, and generated using a 2048-point FFT with 50% overlap and a Hamming window.
Examples of “template-frame” and “cross-frame” correlations for DLFT spectrum.
Pseudo-code of the DLFT-PDA.
(a) Fourier transform and (b) -law-compressed DLFT for a speech signal. Positions of harmonic peaks are indicated by ruler tick marks in the plots.
Spectrograms of killer whale calls overlaid with pitch tracks computed by the DLFT-PDA. All calls contain a LFC but only the call in the upper right contains a HFC.
Histogram of GERs for LFCs (top) and HFCs (bottom).
Histogram of FE for LFCs (top) and HFCs (bottom).
Parameter settings for tracking killer whale calls. is the number of pitch hypotheses in the search space. See text for details.
Performance of DLFT-PDA, peak-picking, and sidewinder algorithms on the LFCs and HFCs of killer whale calls with different SNRs. The average SNR and the number of contours evaluated in each condition are also provided in the table. GER is the 20% gross error rate. FE is the mean of the normalized absolute fine error. See text for details.
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