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.

ISSN:0952-4622    

DOI:10.1080/09524622.2000.9753454

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

CorurosSpalacopus cyanus, social fossorial rodents from Chile, use a complex acoustic repertoire with eleven different true vocalisations and one mechanical sound in various behavioural contexts. The complex of contact calls is particularly well differentiated. Juvenile coruros produced six true vocalisations of which four were structurally identical to adult calls. One vocalisation had components of two adult sounds and one occurred only in juvenile animals. Certain calls from the adult repertoire were lacking. The frequencies of sounds of juveniles were considerably higher than those of adults, with many sounds reaching the ultrasonic range. Nevertheless, pure ultrasonic sounds were not recorded.

ISSN:0952-4622    

DOI:10.1080/09524622.2000.9753455

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

摘要:

Three vocalisation types of the másafuera rayaditoAphrastura masafueraeare described using sonograms: common call, alarm call, and song. They are analysed according to their structure, kHz-frequency, duration and time of day. The common call can be uttered singly or in a series with regular pauses. This intensive call is heard even through fog and wind and seems to be used for contacting the partner as well as signalling the home range to neighbours. The alarm call is a continuous series of similar syllables without pauses. The song is given exclusively in the morning before sunrise by only one individual of the pair. It has one type of phrase only, which is repeated. Phrases are interrupted by regular pauses. These vocalisation types are clearly different from each other, but also have features in common: the monotonous structure, repetition of units and temporal frequency of elements.

ISSN:0952-4622    

DOI:10.1080/09524622.2000.9753456

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

ISSN:0952-4622    

DOI:10.1080/09524622.2000.9753457

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

ISSN:0952-4622    

DOI:10.1080/09524622.2000.9753458

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

ISSN:0952-4622    

DOI:10.1080/09524622.2000.9753459

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor

ISSN:0952-4622    

DOI:10.1080/09524622.2000.9753453

出版商:Taylor & Francis Group    

年代:2000

数据来源: Taylor