THE COMPARISON OF HARMONICALLY RICH SOUNDS USING SPECTROGRAPHIC CROSS-CORRELATION AND PRINCIPAL COORDINATES ANALYSIS
作者:
KATHRYNA. CORTOPASSI,
JACKW. BRADBURY,
期刊:
Bioacoustics
(Taylor Available online 2000)
卷期:
Volume 11,
issue 2
页码: 89-127
ISSN:0952-4622
年代: 2000
DOI:10.1080/09524622.2000.9753454
出版商: Taylor & Francis Group
关键词: spectrographs cross-correlation;principal coordinates analysis;sound comparison;parrot vocalizations;sound synthesis
数据来源: Taylor
摘要:
We explore the effectiveness of spectrographs cross-correlation (SPCC) combined with principal coordinates (PCO) analysis as a method for sound comparison. We do this using synthetic sounds modeled after the individually-distinctive, harmonically-rich contact calls of wild orange-fronted conuresAratinga canicularis.Calls with acoustic properties similar toAratingacontact calls are common in other taxa including non-oscine birds, primates and cetaceans. We generated signals with known variations in time-frequency pattern, duration, noise level, harmonic content and harmonic weighting, and applied SPCC-PCO analysis to obtain an ordering of sounds inn-dimensional space. We find that shared time-frequency patterns dominate the positioning of sounds in PCO space. This was true despite high variability in signal-to-noise ratio (from −60 to +40 dB) and duration (150–275 ms). Furthermore, inclusion of naturally-weighted harmonics (versus fundamentals only) enhances, rather than obscures, the separation of call types. We conclude that SPCC-PCO is an effective method for sorting sounds based on overall time-frequency pattern. In addition, the resulting PCO measures can be used in statistical tests of association with extrinsic variables. The method is thus an effective starting point for examining most bioacoustic hypotheses.
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