Sound Transmission Class (STC ) is an integer rating of how well a building partition attenuates airborne sound. In the USA, it is widely used to rate interior partitions, ceilings and floors, doors, windows and exterior wall configurations (see ASTM International Classification E413 and E90).

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.

2018年9月17日 · How is STC measured? By taking the laboratory-tested transmission loss values of the partition material at 16 of the most common frequencies (between 125 Hz and 4000 Hz), a curve is created. Results are compared to a standard STC reference curve. From this calculation, an STC value is determined.

2023年3月30日 · If your results most closely resemble the curve for an STC rating of 50, then that would be the rating for the material you tested. What is a good STC rating? A good STC rating is largely determined by the type of noise issue you are …

The Sound Transmission Class (STC), as defined by the rating procedure set forth in ASTM E413-87, is determined by adjusting the reference contour vertically until the decibel (dB) total of all frequency bands on the test curve that are below the reference contour does not exceed 32, and no point on the test curve is more than 8 dB below the

Sound Transmission Class (STC) is a single number that describes the ability of a building material or partition to block airborne sound. STC is a laboratory test result defined by ASTM E413 for sound transmission loss testing performed according to ASTM E90.

The STC curvature is a time-dependent control voltage, which regulates the amplification in the high-frequency part of a radar receiver as a function of time. If this gain control does not work, this can result in target losses in the close range, because the …

Circuits used to adjust amplifier gain with time, during a single pulse repetition period, are called STC circuits, or „swept gain attenuator”. Sensitivity time-control circuits apply a bias voltage that varies with time to the IF amplifiers to control receiver gain. The Figure shows a …

2024年2月9日 · STC ratings are calculated by measuring the transmission loss values of 16 - 18 different frequencies between 125 Hz and 4000 Hz and plotting those values as a curve on a graph. That curve is then compared to standard STC rating curves to determine a score.

2025年1月10日 · Understanding STC ratings for drywall can be complex. An STC graph is one drawn up with 16 Transmission Loss values evaluated at 16 standard frequencies, from 125 Hz – 4000 Hz. You compare your measured curve to the graph to obtain your STC rating. What affects STC Ratings for Walls?