Résumé
Sound Transmission Class (or STC) is an integer rating of how well a building partition attenuates airborne sound. In the US, it is widely used to rate interior partitions, ceilings, floors, doors, windows and exterior wall configurations. Outside the US, the ISO Sound Reduction Index (SRI) is used. The STC rating very roughly reflects the decibel reduction of noise that a partition can provide. The STC is useful for evaluating annoyance due to speech sounds, but not music or machinery noise as these sources contain more low frequency energy than speech. There are many ways to improve the sound transmission class of a partition, though the two most basic principles are adding mass and increasing the overall thickness. In general, the sound transmission class of a double wythe wall (e.g. two 4"-thick block walls separated by a 2" airspace) is greater than a single wall of equivalent mass (e.g. homogeneous 8" block wall). The STC or sound transmission class is a single number method of rating how well wall partitions reduce sound transmission. The STC provides a standardized way to compare products such as doors and windows made by competing manufacturers. A higher number indicates more effective sound insulation than a lower number. The STC is a standardized rating provided by ASTM E413 based on laboratory measurements performed in accordance with ASRM E90. ASTM E413 can also be used to determine similar ratings from field measurements performed in accordance with ASTM E336. Sound Isolation and Sound Insulation are used interchangeably, though the term "Insulation" is preferred outside the US. The term "sound proofing" is typically avoided in architectural acoustics as it is a misnomer and connotes inaudibility. Through research, acousticians have developed tables that pair a given STC rating with a subjective experience. The table below is used to determine the degree of sound isolation provided by typical multi-family construction. Generally, a difference of one or two STC points between similar constructions is subjectively insignificant.
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Concepts associés (4)
Son (physique)
vignette|upright=1|Propagation d'ondes sphériques de pression dans un fluide. Le son est une vibration mécanique d'un fluide, qui se propage sous forme dondes longitudinales grâce à la déformation élastique de ce fluide. Les êtres humains, comme beaucoup d'animaux, ressentent cette vibration grâce au sens de l'ouïe. L'acoustique est la science qui étudie les sons ; la psychoacoustique étudie la manière dont les organes du corps humain ressentent et l'être humain perçoit et interprète les sons.
Sound transmission class
Sound Transmission Class (or STC) is an integer rating of how well a building partition attenuates airborne sound. In the US, it is widely used to rate interior partitions, ceilings, floors, doors, windows and exterior wall configurations. Outside the US, the ISO Sound Reduction Index (SRI) is used. The STC rating very roughly reflects the decibel reduction of noise that a partition can provide. The STC is useful for evaluating annoyance due to speech sounds, but not music or machinery noise as these sources contain more low frequency energy than speech.
Isolation phonique
On distingue parfois l'isolation acoustique, qui vise à éviter la propagation dans l'espace ou d'un lieu à l'autre de l'ensemble des bruits, de l'isolation phonique qui s'adresse davantage à l'isolation des bruits de voix. L'insonorisation vise quant à elle à empêcher la propagation du son (par une isolation acoustique intérieure ou extérieure), mais de nombreux matériaux, dits d'« isolation thermophonique » peuvent avoir une triple fonction, à la fois acoustique, phonique et thermique (il s'agit généralement de mousse ou de panneaux de fibres).
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Cours associés (1)
EE-548: Audio engineering
This lecture is oriented towards the study of audio engineering, with a special focus on room acoustics applications. The learning outcomes will be the techniques for microphones and loudspeaker desig