Construction noise and vibration can interrupt sleep/concentration of humans during renovations. Noise treatments or vibration breaks can reduce the impact. But could background noise cover up a moderate level of construction noise? Innocuous sounds are used to mask quieter but more annoying sounds. The concept is commonly used in offices to aid in concentration and reduce annoyance in places where people work or sleep. But could it be used to mask construction noise if the recipients were rodents rather than people? In theory, the concept of sound masking should be valid for other species of animals. Excessive noise and vibration has been shown to affect rodent behavior including breeding. Their hearing, extending into the ultrasound region, complicates efforts to recognize and measure the rodents’ acoustical environment. During the past several years, we have had occasion to study the literature on rodents’ hearing and the use of masking to prevent the creatures from being bothered by intruding sound. In this paper, we summarize the literature and investigate the concept of masking for rodents with respect to regularly encountered sound sources and sounds from construction activities.
When dredges operate near residences, noise can be a concern. The major noise sources of a dredge can include diesel engines (casing and exhaust), generators, transformers, ventilation fans, electric motors, pumps, and winches. Some equipment is enclosed and some is on the open decks. Both airborne and structure-borne noise can be issues. As the dredge operates, its location and orientation relative to residences continuously change. Noise data and treatments are discussed from several dredging projects.
St. Bartholomew's Catholic Church in Katy, Texas, includes a fellowship hall with a great dome. Parishioners use the space for social events including meals and regular bingo games. High reverberation times in the fellowship hall reduced speech communication and acoustic comfort. Measurements were conducted to assess the reverberation time of the room before and after applying treatment to the space. Sabine reverberation time analysis was used to specify the recommended sound absorption for the fellowship hall. EASE analysis of the space reveals more interesting characteristics.
CSTI acoustics worked with a community on the planning of a festival site that will host outdoor concerts. Our work involved measuring sound from an outdoor concert at a nearby venue, documenting ambient sound levels in communities surrounding the proposed festival site, modeling the sound propagation from optional stage locations and orientations, and proposing procedures and sound limits for future performances.
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