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JournalISSN: 0711-6659

Canadian Acoustics 

Canadian Acoustical Association
About: Canadian Acoustics is an academic journal. The journal publishes majorly in the area(s): Noise & Vowel. It has an ISSN identifier of 0711-6659. Over the lifetime, 1505 publications have been published receiving 5392 citations.


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Journal Article
G. Farhat1
TL;DR: The book is about diagnostic ultrasound imaging authored by Dr. Thomas L. Zabo and graduate students in medical physics and biomedical engineering with backgrounds in calculus, complex numbers and some knowledge on electric circuits would benefit.
Abstract: The book is about diagnostic ultrasound imaging authored by Dr. Thomas L. Zabo. Graduate students in medical physics and biomedical engineering with backgrounds in calculus, complex numbers and some knowledge on electric circuits would benefit from this book.

367 citations

Journal Article
TL;DR: The Penn Forced Aligner automates the alignment process using the Hidden Markov Model Toolkit (HTK), and the core of Prosodylab-Aligner is align, a script which performs acoustic model training and alignment.
Abstract: The Penn Forced Aligner automates the alignment process using the Hidden Markov Model Toolkit (HTK). The core of Prosodylab-Aligner is align. py, a script which performs acoustic model training and alignment. This script automates calls to HTK and SoX, an open-source command-line tool which is capable of resampling audio. The included README file provides instructions for installing HTK and SoX on Linux and Mac OS X, and can also be run on Windows. During training, the model is initialized with flat-start monophones, which are then submitted to a single round of model estimation. Then, a tied-state 'small pause' model is inserted and used in a second round of estimation. The data is then aligned once to choose the most likely pronunciation of all homonyms. Web audio is downloaded from Ramp, a company which indexes radio and television programming, including NBC, PBS, Fox and CBS Radio, and processed using standard UNIX tools.

165 citations

Journal Article
TL;DR: In this paper, the authors provide an overall perspective of the workers' compensation board of British Columbia, including the hearing branch and two sections of Prevention Services, the Noise Control Section and the Engineering and Research Section.
Abstract: This article provide an overall perspective of the Workers' Compensation Board of British Columbia. Three sections of the Workers Compensation Board of British Columbia are engaged in acoustical activities. These three are the Hearing Branch and two sections of Prevention Services, the Noise Control Section and the Engineering and Research Section.

135 citations

Journal Article
TL;DR: In this paper, an inverse characterization method based on impedance tube measurements is proposed to obtain reliable evaluations of the tortuosity, and the viscous and thermal characteristic lengths of the porous medium.
Abstract: Unlike porous models developed for particular absorbing materials and frequency ranges, the Johnson-Champoux-Allard model is a generalized model for sound propagation in porous materials over a wide range of frequencies. This model is nowadays used widely across the acoustic research community and by industrial sector. However to use this model, the knowledge, particularly, of the intrinsic material properties defining the model is necessary. Using the proposed porous model and with the knowledge of the intrinsic properties, the calculation of the desired acoustical indicators as well as the design and optimization of several acoustic treatments for noise reduction can be done efficiently and rapidly. The model of Johnson-Champoux-Allard is based on five intrinsic properties of the porous medium: the flow resistivity, the porosity, the tortuosity, the viscous characteristic length, and the thermal characteristic length. While the open porosity and airflow resistivity can be directly measured without great difficulties, the direct measurements of the three remaining properties are usually complex, less robust, or destructive. To circumvent the problem, an inverse characterization method based on impedance tube measurements is proposed. It is shown that this inverse acoustical characterization can yield reliable evaluations of the tortuosity, and the viscous and thermal characteristic lengths. The inversion algorithm contains an optimization process and hence it is verified that the identified optimal three parameter, even though derived from a mathematical optimum for a given experimental configuration (sample's thickness, measured frequency range), are the intrinsic properties of the characterized porous material.

112 citations

Journal Article
TL;DR: The detection system is capable of picking out a high proportion of right whale calls logged by a human operator, while at the same time working at a false alarm rate of only one or two calls per day, even in the presence of background noise from humpback whales and seismic exploration.
Abstract: A detector has been developed which can reliably detect right whale calls and distinguish them from those of other marine mammals and industrial noise. Detection is a two stage process. In the first, the spectrogram is smoothed by convolving it with a Gaussian kernel and the 'outlines' of sounds are extracted using an edge detection algorithm. This allows a number of parameters to be measured for each sound, including duration, bandwidth and details of the frequency contour such as the positions of maximum and minimum frequency. In the second stage, these parameters are used in a classification function in order to determine which sounds are from right whales. The classifier has been tuned by comparing data from a period when large numbers of right whales were known to be in the vicinity of bottom mounted recorders with data collected on days when it was believed, based on ship and aerial surveys, that no right whales were present. Overall, the detection system is capable of picking out a high proportion of right whale calls logged by a human operator, while at the same time working at a false alarm rate of only one or two calls per day, even in the presence of background noise from humpback whales and seismic exploration. Although it is impossible to reduce the false alarm rate for individual calls to zero whilst still maintaining adequate efficiency, by requiring the detection of several calls within a set waiting time, it is possible to reduce false alarm rate to a negligible level.

95 citations

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Performance
Metrics
No. of papers from the Journal in previous years
YearPapers
20211
20207
201921
201813
201748
201690