The CAA is the professional, interdisciplinary organization that :    - fosters communication among people working in all areas of acoustics in Canada   - promotes the growth and practical application of knowledge in acoustics   - encourages education, research, protection of the environment, and employment in acoustics   - is an umbrella organization through which general issues in education, employment and research can be addressed at a national and multidisciplinary level

The Canadian Acoustics Association (CAA) is a professional, interdisciplinary organization that: - fosters communication among individuals working in all areas of acoustics in Canada; - promotes the growth and practical application of knowledge in acoustics; - encourages education, research, environmental protection, and employment in acoustics; - serves as an umbrella organization through which general issues in education, employment, and research can be addressed at a national and multidisciplinary level.

加拿大声学学会（Canadian Acoustics - Acoustique Canadienne）是一个专业的跨学科组织，旨在：- 促进加拿大各领域声学工作者之间的交流；- 促进声学知识的增长和实际应用；- 鼓励声学领域的教育、研究、环境保护和就业；- 作为一个综合性组织，解决教育、就业和研究等一般问题，推动国家和多学科层面的讨论。

Canadian Acoustics - Acoustique Canadienne

Curtain wall construction is very common in modern commercial buildings. The continuous external facade can lead to significant limitations on the sound isolation between adjacent rooms, separated either laterally or vertically. Flanking transmission of curtain wall systems is very difficult to predict at the design stage of a project. Manufactures do not routinely measure this parameter. The scarcity of data is partly due to a lack of laboratories that have the necessary specialized test environment. Generic flanking transmission loss data is of little value because of the large variation in curtain wall assemblies. Designers are often left with best guess approximations based on previous experience. These factors  also  make it difficult to significantly improve flanking transmission of an existing curtain wall installation.
This paper describes a project where significant flanking along the curtain wall resulted in poor sound isolation between floors. Due to the complexity of the junction between the curtain wall and the floor structure, several potential flanking paths were identified and evaluated. It was possible to alter each flanking path individually so that the incremental improvement of each step could be quantified. After implementing several modifications, an improvement of approximately 15 dB was observed across a wide frequency range.

Kelly Kruger

Robert Ogle

Canadian acoustics

Complexities of Curtain Wall Flanking Transmission – A Case Study

幕墙侧向传声的复杂性 – 一个案例研究

Sonic boom noise is predicted from parameters including aircraft weight, volume, shape, and standard atmospheric models. The acoustic field near the aircraft is calculated based on a cylindrical approximation to the aircraft shape and a variable lift distribution. Sound is propagated from the aircraft to the ground by considering both the sharpening of the boom due to shock ageing, and the softening of the sound due to frequency dependent atmospheric absorption. The resultant pressure signature at ground level is converted to a perceived sound level and compared to a maximum proposed noise limit of 75 dB. Obtained results are verified using NASA’s PCBoom program as well as with selected ground measurements for supersonic flights. Preliminary results show that inoffensive supersonic flight may require either high altitudes, or aircraft that are smaller and lighter than most common airliners.

John Halpenny

Joana Rocha

Minimizing Sonic Boom Noise to Meet Potential Regulatory Limits

满足潜在法规限制的音爆噪声最小化

A case study will be presented where a number of wind turbines in a project were intentionally yaw misaligned to investigate various effects. This paper investigates changes in sound level and special characteristics of wind turbine noise (amplitude modulation) due to the intentional yaw misalignment.

Ian Bonsma

Nathan Gara

Brian Howe

Intentional Yaw Misalignment and the Effects on Wind Turbine Noise

风力涡轮机噪声中的有意偏航偏移及其影响

The present study investigates the production of American English (hereafter English) vowels in both function and lexical words by Spanish native speakers (n=62) and English native speakers (n=30) in recordings from the Speech Accent Archive (Weinberger & Kunath, 2011). Vowels contained in English function words are often reduced (Jurafsky et al., 1998), while those in Spanish are less so (Hualde, 2005). Thus, the Spanish speaker learning English must learn not only a new vowel inventory but also the process of reducing these vowels in function words. The majority of research on L2 speech has focused on vowels in lexical items, a literature gap that the current study addresses. The recordings were analyzed acoustically in Praat (Boersma & Weenink, 2016), where the first two formant values of each vowel token were extracted from the vowel midpoint. Formant values were normalized with the “Nearey Intrinsic” method in phonTools (Barreda, 2015).  As age of onset of acquisition (AOA) is known to affect L2 pronunciation, the Spanish L1 speakers were split into two groups based on AOA. Both learner groups’ productions were compared to those of native speakers with a MANOVA run for each vowel, with normalized formant values as the dependent variables, and L1 as the independent variable. Pillai scores from the MANOVAs were used as a measure of vowel overlap (Hay et al., 2006). Pairwise comparisons were also run between vowels within groups to determine the extent of vowel neutralization in function words. In function words, the low AOA group patterned closely with the native speaker group, showing complete neutralization of some vowels and partial neutralization of others. The high AOA group showed partial neutralization of vowels in function words, which did not happen in lexical items. Results are discussed in the context of L2 speech learning theories and general phonetic theory.

Scott James Perry

Benjamin V. Tucker

L2 Production of American English Vowels in Function Words by Spanish L1 Speakers

西班牙语母语者对功能词中美国英语元音的二语产出

Black-capped chickadees (Poecile atricapillus) are small, non-migratory songbirds that are commonly seen across much of North America. One of their primary vocalizations, the fee-bee song, has been well-documented in males and functions in both mate attraction and territory defense (Smith, 1991). Both of these functions are critical to fitness particularly in the spring during the breeding season, but less so during other times of the year. Use of this song by females has only recently been described and its function is not well understood (Hahn et al., 2013). In this experiment, we measured acoustic features related to frequency and duration of both male- and female-produced fee-bee songs that had been recorded at two times of the year (e.g., spring and fall). We found that male songs showed less variation overall in their acoustic measures than female songs across both seasons. We also found that songs produced in the spring had less overall variation than those produced in the fall, regardless of sex of the producer. This suggests that fee-bee songs are more critical in the spring than fall, and also suggests that male song consistency may be more important than female song consistency. More research into the use and function of female song may elucidate these sex differences.

ISSN	0711-6659, 2291-1391
h-index	22

Publication Information	Publisher: Canadian Acoustical Association，Publishing cycle: ，Journal Type: journal，Open Access Journals: No
Basic data	Year of publication: 1996，Proportion of original research papers: 0.00%，Self Citation Rate:N.A.， Gold OA Rate: 0.00%

Canadian Acoustics - Acoustique Canadienne

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Complexities of Curtain Wall Flanking Transmission – A Case Study

Minimizing Sonic Boom Noise to Meet Potential Regulatory Limits

Intentional Yaw Misalignment and the Effects on Wind Turbine Noise

L2 Production of American English Vowels in Function Words by Spanish L1 Speakers

Features of Male- and Female-Produced Song in Black-Capped Chickadees (Poecile Atricapillus) Change Between Seasons

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