On the use of modified phase transform weighting functions for acoustic imaging with the generalized cross correlation

2019 ◽  
Vol 145 (3) ◽  
pp. 1546-1555 ◽  
Author(s):  
Thomas Padois ◽  
Olivier Doutres ◽  
Franck Sgard
Keyword(s):  
Cross Correlation ◽  
Acoustic Imaging ◽  
Weighting Functions ◽  
Phase Transform

scholarly journals Acoustic imaging with conventional frequency domain beamforming and generalized cross correlation: a comparison study

2021 ◽  
Vol 177 ◽  
pp. 107914
Author(s):  
Thomas Padois ◽  
Jeoffrey Fischer ◽  
Con Doolan ◽  
Olivier Doutres
Keyword(s):  
Frequency Domain ◽  
Cross Correlation ◽  
Acoustic Imaging ◽  
Comparison Study

scholarly journals Performance Evaluation of Traditional Signal Processing Methods in Localizing Tursiops truncatus Whistles in a Reverberant Aquatic Environment

2019 ◽  
Author(s):  
SF Woodward ◽  
MO Magnasco
Keyword(s):  
Signal Processing ◽  
Aquatic Environment ◽  
Tursiops Truncatus ◽  
Cross Correlation ◽  
Correlation Method ◽  
Extraction Methods ◽  
Phase Transform ◽  
Atlantic Bottlenose Dolphin ◽  
Signature Whistles ◽  
Signal Processing Methods

AbstractRelative to individually distinctive signature whistles, little is known about the “non-signature” calls – particularly the non-signature whistles – of the common Atlantic bottlenose dolphin, Tursiops truncatus. While such calls are suspected to serve social function, tracking their exchange among conspecifics and correlating their usage with non-acoustic behavior has proven challenging, given both their relative scarcity in the dolphin repertoire and their characteristic shared use among dolphins, which precludes the unique identification of callers on the basis of whistle properties alone. Towards the goal of robustly identifying the callers of non-signature whistles (equivalently, attributing non-signature whistles to callers), we present a new, long-term audiovisual monitoring system designed for and tested at the Dolphin Discovery exhibit of the National Aquarium in Baltimore, Maryland. In this paper, we confirm the system’s ability to spatially localize impulse-like sounds using traditional signal processing approaches that have already been used to localize dolphin echolocation clicks. We go on to provide the first rigorous experimental evaluation of the component time-difference-of-arrival-(TDOA) extraction methods on whistle-like tonal sounds in a (reverberant) aquatic environment, showing that they are generally not suited to sound localization. Nevertheless, we find that TDOA extraction under these circumstances is performed significantly better using a Generalized Cross-Correlation with Phase Transform (GCC-PHAT) method than a standard circular cross-correlation method, a potentially important result.

Enhancement of time-domain acoustic imaging based on generalized cross-correlation and spatial weighting

2016 ◽  
Vol 75 ◽  
pp. 515-524 ◽  
Author(s):  
Nicolas Quaegebeur ◽  
Thomas Padois ◽  
Philippe-Aubert Gauthier ◽  
Patrice Masson
Keyword(s):  
Time Domain ◽  
Cross Correlation ◽  
Acoustic Imaging

Volume-dependent variations of regional lung sound, amplitude, and phase

2002 ◽  
Vol 93 (3) ◽  
pp. 1030-1038 ◽  
Author(s):  
Hiroshi Kiyokawa ◽  
Hans Pasterkamp
Keyword(s):  
Respiratory System ◽  
Phase Relation ◽  
Cross Correlation ◽  
Vital Capacity ◽  
Pulmonary Ventilation ◽  
Acoustic Imaging ◽  
Lung Sounds ◽  
Lung Sound ◽  
Regional Lung ◽  
Band Pass

Acoustic imaging of the respiratory system demonstrates regional changes of lung sounds that correspond to pulmonary ventilation. We investigated volume-dependent variations of lung sound phase and amplitude between two closely spaced sensors in five adults. Lung sounds were recorded at the posterior right upper, right lower, and left lower lobes during targeted breathing (1.2 ± 0.2 l/s; volume = 20–50 and 50–80% of vital capacity) and passive sound transmission (≤0.2 l/s; volumes as above). Average sound amplitudes were obtained after band-pass filtering to 75–150, 150–300, and 300–600 Hz. Cross correlation established the phase relation of sound between sensors. Volume-dependent variations in phase (≤1.5 ms) and amplitude (≤11 dB) were observed at the lower lobes in the 150- to 300-Hz band. During inspiration, increasing delay and amplitude of sound at the caudal relative to the cranial sensor were also observed during passive transmission in several subjects. This previously unrecognized behavior of lung sounds over short distances might reflect spatial variations of airways and diaphragms during breathing.

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