There are several acoustic requirements in order to optimize the healing environment for the patients in a trauma room, as well as increase medical staff concentration and clarity of speech within the room. This is especially true in a pediatric setting. First, there is the requirement that the reverberation time of the room must be reduced in order to assist in hearing/speech clarity while adhering to clean room standards. Secondly, there needs to be an increase in the signal to noise ratio (SNR). A greater SNR assists in hearing/speech clarity; the lower reverberation time also assists in preventing the various intrusive mechanical sounds from becoming amplified and further reducing the SNR. In addition to these two standard room requirements, there is also a need for the reduction of lower frequency sounds within a room, such as sounds typical of mechanical equipment. Since standard products used to absorb sound have more absorption in speech frequencies, there is a need for products that have greater absorption in lower frequencies. This paper presents background on two SoundSense patented products that were used in a study for improved conditions and outcomes in a hospital pediatric trauma room.
A significant part of our profession is translation. It is far too easy to provide the exact right answer to the wrong question and the right solutions are often beyond the problem presented. This conversation will discuss cases where misunderstanding or misleading information was followed by folks asking the wrong question. These examples did or could have resulted in unsatisfactory outcomes at best and deadly outcomes at worst.
The paradise architectural acoustic devices are sound modifying architectural elements, or structures. The architectural structure can be made to look like any one of the standard architectural structures commonly used in a room, from baseboards to crown moldings or ceiling beams. Depending on the intended outcome, the architectural elements can either be a solid body, or what appears to be a solid element but has internal mathematically determined channels. This allows the architectural elements, or devices, to not only reduce or correct the decay time in the room, but also make certain that the architectural elements do not produce undesirable effects. The mathematical foundation of the various shapes and designs of the architectural acoustic structures, or elements, will be presented for a linear case. This will allow a better understanding of the underlining acoustical effects. An appreciation for a more precise mathematical description of the embodiments will also be discussed by additionally taking into account the nonlinear aspects of the various embodiments. Various views of an acoustic architectural device for reducing or correcting decay time will be presented. Additionally, the improvements to the acoustic environment of the room that result from the paradise architectural elements will be provided.
Resilient underlayments are commonly utilized as a primary method of reducing footfall noise in architectural acoustics. Although resiliency is a large component of a partition’s footfall performance, as well its ability to achieve higher AIIC ratings through ASTM E1007 AIIC testing, adding resiliency alone does not always address all of the frequencies which cause disturbances due to footfall. Particularly in lightweight construction, the density of the configuration is also a critical component of a successful solution. Due to the lack of sufficient mass in lightweight construction materials, successful treatment for impact noise disturbances in lightweight conditions becomes more difficult to achieve. This paper compares data with different flooring configurations in mock-up ASTM AIIC testing conditions in order to evaluate advantages and disadvantages of ANISPL (Absorption Normalized Impact Sound Pressure Level) performance in different frequencies. Resiliency and density are added in varying combinations in a wood frame construction in order to better understand their relationship to AIIC ratings and a partition’s success in impact noise insulation.
A way to absorb and filter low-frequency sound that is generated by sound sources in one or more enclosures is described. A sound generating room is encapsulated within an outer acoustic absorbing room that contains various openings to several acoustic ducts. The acoustic ducts function as an acoustic waveguide to the open air. At each end of the acoustic duct is an impedance matching tapered acoustic horn. In the sound generating room the horn serves as an acoustic absorber that tapers sound into the acoustic duct. At the opposite end, the horn serves as an acoustic radiator of sound energy to the open air. Both radiator and absorbers may be tuned to transmit frequencies past a certain cutoff. The effect is similar to a pressure release valve. The acoustic waveguides may be coupled to tunable passive or active noise mitigation devices such as Helmholtz resonators and low-frequency noise sources that utilize phase information.
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