Analysis of practical sound transmission class (STC) measurements performed under a variety of field conditions

2003 ◽  
Vol 114 (4) ◽  
pp. 2306-2307
Author(s):  
James Conroy
Keyword(s):  
Sound Transmission ◽  
Field Conditions ◽  
Sound Transmission Class

Acoustical performance of horizontal-sliding-panel operable partition walls

2021 ◽  
Vol 263 (1) ◽  
pp. 5125-5130
Author(s):  
Jim Borzym
Keyword(s):  
Transmission Loss ◽  
Sound Transmission ◽  
Field Measurements ◽  
Field Conditions ◽  
Sound Transmission Loss ◽  
Airborne Sound ◽  
Partition Walls ◽  
Panel Type ◽  
Sound Transmission Class

Field measurements of airborne sound transmission loss were made on several operable partitions of the horizontal-sliding-panel type between conference rooms. Apparent Sound Transmission Class (ASTC) and Noise Isolation Class (NIC) ratings were computed. Very significant deviation of field-measured sound transmission ratings and manufacturers' Sound Transmission Class (STC) ratings were found. Clients were not satisfied by actual sound isolating performance. Transmission of voice was clearly audible. Some deficiencies of field conditions were found. Some deficiencies of partition installation were found. Modifications were made; acoustical performance did not change significantly.

scholarly journals Enhanced speech privacy in office spaces

2018 ◽  
Vol 26 (1) ◽  
pp. 57-66 ◽  
Author(s):  
Alexey Krasnov ◽  
Edward R Green ◽  
Bret Engels ◽  
Barry Corden
Keyword(s):  
White Noise ◽  
Sound Transmission ◽  
Original Signal ◽  
Specific Interest ◽  
Speech Characteristics ◽  
Experimental Parameters ◽  
Sound Transmission Class ◽  
Increasing Demand ◽  
Office Environments

There is an ever-increasing demand for speech privacy in modern office spaces. People prefer their conversations to remain private while not being disturbed by speech of others. The work presented in this article focuses on reducing the intelligibility of the perceived speech by masking the original signal without a significant additional annoyance. The disruption of the information-carrying components of speech by the amplitude and temporal smearing is of a specific interest of this work. We suggest a method in which a modified self-adjusted masking signal is used to effectively counteract the drawbacks of a straightforward reverberation. The presented masking method disrupts key speech characteristics of the original signal. The intelligibility and annoyance levels of the resulting signal are subjectively evaluated. The optimized experimental parameters are reported. The presented method provides a significantly higher speech privacy and a lower perceived annoyance as compared to white noise. The method can be used in office environments with various Sound Transmission Class levels.

Characterizing the Sound Insulation of a Specially Orthotropic Multi-Layered Medium

2007 ◽  
Vol 23 (1) ◽  
pp. 63-68 ◽  
Author(s):  
H.-J. Lin ◽  
C.-N. Wang ◽  
Y.-M. Kuo
Keyword(s):  
Boundary Conditions ◽  
Sound Propagation ◽  
Transmission Loss ◽  
Sound Transmission ◽  
Single Layer ◽  
Sound Insulation ◽  
Sound Transmission Loss ◽  
Reinforced Plastics ◽  
Fiber Reinforced Plastics ◽  
Sound Transmission Class

AbstractThis work explores the sound transmission loss provided by the orthotropic multi-layers to elucidate the sound insulation of FRP (Fiber Reinforced Plastics). Mat is the major material considered in the numerical works. The transfer matrices of a single layer of the orthotropic laminate and the fluid are determined. Further, the boundary conditions on the various interface planes are arranged into matrix form. Combining the transfer matrixes and the boundary conditions and applying the transfer matrix method (TMM) yields the surface impedance and the sound transmission loss. The sound-propagation characteristics are studied. Additionally, the STC (Sound Transmission Class) of FRP and steel are compared and discussed.

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