## Automatic Bird Song Recognition |

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Page 31

The Fourier transform tries to match the sum of the weighted ej” to an infinite

performed on a finite length sequence x(n) of the waveform, edge effects arise

which distort ...

The Fourier transform tries to match the sum of the weighted ej” to an infinite

**signal**consisting of concatenated copies of the x(n). Since the transform isperformed on a finite length sequence x(n) of the waveform, edge effects arise

which distort ...

Page 32

The inverse Fourier transform of this result then produces a

different from the original

phenomena in the spectrum, such as a series of harmonics. When the cepstrum

is taken ...

The inverse Fourier transform of this result then produces a

**signal**radicallydifferent from the original

**signal**, with sharp peaks corresponding to periodicphenomena in the spectrum, such as a series of harmonics. When the cepstrum

is taken ...

Page 34

If G(z) is the z transform of the glottal pulse train, and H(z) is the transfer function

of the vocal tract, the spectrum of the final speech

evaluated at z = ej”. Periodic pulses with sharp edges, such as the glottal

vibrations, ...

If G(z) is the z transform of the glottal pulse train, and H(z) is the transfer function

of the vocal tract, the spectrum of the final speech

**signal**is S(z) = G(z)H(z)evaluated at z = ej”. Periodic pulses with sharp edges, such as the glottal

vibrations, ...

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### Common terms and phrases

60 Figure acoustic algorithm analysis average amplitude avian bird song bird species California Quail calls CDFE cepstral cepstral peak Cepstrum chirp feature vectors chirp list Clark's Nutcracker comparison Computer congruent corresponding described in Section detected difference dynamic time warping entire song excursion cycle Figure 11b formula Frequency Frequency Duration glottal Greenewalt harmonics Hence High Low High House Finch human speech recognition I I I individual inter-note distances internal tympaniform membranes Itakura distance length Linear Prediction Low High Low magnitude Markov models noise Olive-sided Flycatcher phase phonemes present point range recognition system recordings represented ripples sample points sampling rate Scrub Jay segment of speech sequence of labels signal similar sine wave sonagrams song feature Song Sparrow sound spectrum squawk Steller's Jay subsource Swainson's Thrush syntactic Theorem thesis trachea Typical upward zero crossing vibration vocal tract Warbling Vireo waveform Western Meadowlark whistled White-crowned Sparrow