Acoustic Structure of English Diphthongs and Semi-Vowels vis-�-vis Their Phonemic Symbolization

2015 ◽  
pp. 589-593 ◽  
Author(s):  
C. M. Wise
Keyword(s):  
Acoustic Structure

Effects of Body Size and Environmental Factors on the Acoustic Structure and Temporal Rhythm of Calls in Rhacophorus dennysi

2012 ◽  
Vol 3 (3) ◽  
pp. 205-212 ◽  
Author(s):  
WANG Jichao ◽  
CUI Jianguo ◽  
SHI Haitao ◽  
E. BRAUTH Steven ◽  
TANG Yezhong
Keyword(s):  
Body Size ◽  
Environmental Factors ◽  
Acoustic Structure ◽  
Temporal Rhythm

Vocalize to localize

2005 ◽  
Vol 5 (3) ◽  
pp. 327-344 ◽  
Author(s):  
Marta B. Manser ◽  
Lindsay B. Fletcher
Keyword(s):  
Visual Cues ◽  
Gaze Direction ◽  
Alarm Calls ◽  
General Behaviour ◽  
Acoustic Structure ◽  
Suricata Suricatta ◽  
High Urgency ◽  
High Stimulus ◽  
Functionally Referential ◽  
Stimulus Specificity

In this study of the functionally referential alarm calls in the meerkats (Suricata suricatta), we tested the hypothesis that the ability to refer to a specific location was an important factor in the evolution of discrete vocalizations. We investigated what information receivers gained about the location of the predator from alarm calls with high stimulus specificity compared to alarm calls with low stimulus specificity. Furthermore, we studied whether visual cues about the localization of the predator may be available from the posture of the caller. We described the general behaviour of the caller, the caller’s posture, and in particular its gaze direction. We then observed receivers responding to the different call types, to determine whether the acoustic structure of the calls was enough for them to respond in the appropriate way, or whether they used additional visual cues from the caller. We tested this with specific manipulation experiments, using three set ups of playback experiments: (1) no caller visible; (2) model guard with specific gaze direction; and (3) live sentinel. Natural observations and experiments confirmed that in high urgency situations the meerkats have enough information from the acoustic structure of the call to respond appropriately. When hearing low urgency calls that are less stimuli specific, meerkats used visual cues as an additional source of information in a few cases. This may indicate that functionally referential calls evolved to denote the location of the predator, rather than the predator type or its velocity of approach. However, when discussing this result in comparison to other functionally referential calls, such as the food associated calls and recruitment calls, this localization hypothesis does not appear to apply to the functionally referential calls in general.

Analysis of Acoustic-Structure Interaction Using a High-Order Doubly Asymptotic Approximation

2016 ◽  
Vol 24 (01) ◽  
pp. 1550021 ◽  
Author(s):  
Heekyu Woo ◽  
Young S. Shin
Keyword(s):  
Order Approximation ◽  
Stable Model ◽  
Approximation Model ◽  
Third Order ◽  
Acoustic Structure ◽  
Structure Interaction ◽  
Proposed Model ◽  
The Stability ◽  
Third Order Approximation ◽  
Interaction Problem

In this paper, a new third-order approximation model for an acoustic-structure interaction problem is introduced. The new approximation model is designed to be an accurate and a stable model for predicting the response of a submerged structure. The proposed model is obtained by combining two lower order approximation models instead of using an operator matching method. The stability of this model is checked by a modal analysis. Finally, the approximation model is coupled to the spherical shell structure, and its performance is checked by a shock analysis.

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