a rating of the ability of building materials to stop the transmission of unwanted sounds. The rating is designed so that it expresses, as best one can with a single figure, the sound transmission loss in decibels when sound passes through the material. To determine the STC rating, test sounds of 16 different frequencies are transmitted through the barrier. The data is then smoothed to a standard contour using an established protocol, and the STC rating is the "smoothed" sound transmisson loss at a frequency of 500 hertz. Ordinary conversation can be understood through a window pane rated STC 25; a wall rated STC 50 stops all but the loudest shouting.
The rating that identifies the ability of an object to block sound.
A single-number rating system used to compare the sound-isolating characteristics of partitions used to separate occupied spaces. Assemblies are rated in terms of Sound Transmission Classifications. An STC value of 20-25 would indicate that even low speech would be audible in an adjoining room. An STC value of 50-60, on the other hand, would indicate that loud sound would be heard only faintly or not at all.
A single-number system used to rate the sound transmission performance of a wall, panel, ceiling, etc. The higher the ranking, the better the ability to obstruct sound transmission.
A rating number used to classify the sound attenuation capabilities of various walls, floors, ceiling, doors, windows, etc. It is measured over the frequency range 125 - 4000 Hz, as it is intended to evaluate speech privacy, and so it tells us absolutely nothing about isolating the bass frequencies - one of the most serious problems with home entertainment systems. Abbreviated: STC, and it is specified in dB, larger numbers being better.
A numerical rating of the sound control performance of a wall or ceiling; the higher the number, the better the sound control.
A single number rating the efficiency of building elements in reducing the transmission of noise. It is expressed in decibels and the larger the number, the greater the sound reduction achieved in the building.
This is a rating for doors, windows, enclosures, noise barriers, partitions and other acoustical products. The rating is in terms of their relative ability to provide privacy against intrusion of speech sounds. This is a one number rating system, heavily weighted in the 500Hz to 2000Hz frequency range where speech intelligitibility largely occurs.
A classification of the sound insulating properties of a material or structure. Sound Transmission Class is commonly used to rate office walls and furniture partitions.
The sound transmission loss rating of a material over a selected range of sound frequencies. The higher the number, the less sound transmitted.
Overall single number performance rating of transmission loss. See transmission loss.
A rating measuring a window's acoustic properties or its ability to reduce sound transmission. An STC rating is determined by measuring the sound transmission over a selected range of sound frequencies. The higher the number, the less sound transmitted.
Sound Transmission Class (or STC) is a widely used** integer-number rating of how well a building partition attenuates airborne sound.