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Transmission of Sound Through Structures
Published in Malcolm J. Crocker, Frederick M. Kessler, Noise and Noise Control, 2018
The ASTM procedure just described gives a value of impact insulation class (IIC) roughly comparable in magnitude to a floor or partition's sound transmission class (STC). This is of considerable advantage to an architect who may now specify a floor to have, say, STC = 50 and IIC = 50 for a particular application. It should be noted, however, that a floor's impact insulation can usually be improved rather easily by installing a soft resilient layer on the surface (such as a carpet, or, better still, a carpet with an underlay). Other, more durable, resilient materials than carpet are available and preferred for industrial or heavy wear. While the use of resilient materials can improve the IIC of a floor/ceiling considerably, they have very little effect on airborne sound transmission loss and STC. If impact noise must be reduced even further, consideration should be given to the use of a floating floor construction. See Chapter 3 and References 114 and 115 in Volume II.
Sound Control in Buildings
Published in Lewis H. Bell, Douglas H. Bell, Industrial Noise Control, 2017
Lewis H. Bell, Douglas H. Bell
By far the most accepted method for rating the performance of sound-isolating building constructions is in terms of sound transmission class or, as commonly abbreviated, STC. To determine the STC of a test specimen, say a wall construction, the transmission loss TL is measured in a series of 16 test bands, usually in accordance with ASTM E90, Standard Recommended Practice for Laboratory Measurement of Airborne Sound Transmission Loss of Building Partitions. These TL values are then compared to a reference contour, as illustrated in Fig. 15.5. The reference curve, usually a transparent overlay, is moved or adjusted to a position where the sum of deficiencies and maximum deficiencies meet a given criterion of the standard. The STC value is then taken as the intercept of the reference contour and the 500-Hz ordinate. For complete details, the reader is referred to the ASTM Standard Classification for Determination of Sound Transmission Class, Designation E413.
Transmission of Sound
Published in Randall F. Barron, Industrial Noise Control and Acoustics, 2002
The sound transmission class (STC) rating was developed to provide a single-number rating of partitions, and yet provide additional information about the frequency spectrum of the transmission loss (ASTM, 1984). The STC rating generally correlates the impressions of the sound insulation characteristics of walls for transmission of such sounds as speech, radio, television, and other broadband noise sources in buildings. The STC rating is defined as the value of the transmission loss at 500 Hz which approximates a standard TL curve, measured in sixteen 1/3 octave band intervals from 125 Hz through 4000 Hz. The standard curve has three portions: (a) from 125 Hz to 400 Hz, in which the curve increases 3dB for each 1/3 octave increase; (b) from 400 Hz to 1250 Hz, in which the curve increases 1 dB for each 1/3 octave increase; and (c) from 1250 Hz to 4000 Hz, in which the curve is constant at a value 4 dB higher than the value at 500 Hz.
Noise-reducing vents for windows in warm, humid, tropical countries
Published in Architectural Engineering and Design Management, 2019
Prasasto Satwiko, Ade Prasetya, Fefen Suhedi
The laboratory measurement of the NRVW prototype was performed in the sound insulation test facility of the Laboratory of Acoustics of the Research Centre for Housing and Human Settlement, Bandung, in accordance with the ASTM E90-09 standard. This standard is for measuring the sound insulation performance of partitions, windows, and façades. The sound pressure levels in the sound-receiving room and source room were measured simultaneously after pink noise was generated through the loudspeakers installed in the source room. Based on the measured values, the sound transmission loss values were calculated once the reverberation time of the sound-receiving room had been measured. The transmission loss of the test specimen, which is smaller than the sample opening in the test facilities, was calculated according to the Annex A3 ASTM E90-09 procedure. The STC rating was calculated based on the sound transmission loss data according to ASTM E413, and outdoor–indoor transmission class (OITC) classified by ASTM E1332.
Acoustic behaviour of textile structures
Published in Textile Progress, 2021
Parikshit Paul, Rajesh Mishra, B. K. Behera
STC is a numerical rating used to indicate how effectively a given building material blocks the transmission of sound. Acousticians have developed tables that pair a given STC rating with a subjective experience and that given below is used to determine the degree of sound isolation (see Table 3). A difference of one or two STC points between similar constructions is subjectively insignificant; STC is used to rate partitions or dividers and floors, ceilings, doors, and windows. A low-performance rating is less or equal to 35, while a high-performance rating will be greater or equal to 55 (Lothar & MüLler, 1982; Wood, 1957).
Implementation and evaluation of ASHRAE’s acoustic Performance Measurement Protocols
Published in Science and Technology for the Built Environment, 2019
Gabrielle McMorrow, Liping Wang
Sound transmission class, or STC, follows the rule that the higher the STC rating, the better is the sound isolation. No required criteria were found for STC regulation; however, barriers with STC ratings at or below 25 generally allow normal speech to be heard, while those with STC ratings greater than 60 generally imply “excellent soundproofing” (Soundproofing Company, Inc., n.d.). That being said, an STC rating of 41 is generally good, and only loud speech can be heard as a murmur (Soundproofing Company, Inc., n.d.).