NR value
Room acoustics and acoustic properties, decibel A, B and C, Noise Rating (NR) curves, sound transmission, sound pressure, sound intensity and sound attenuation.
Noise is usually defined as unwanted sound - noise, noise generation, silencers and attenuation in HVAC systems.
Human physiology, air quality and comfort temperatures, activity and metabolic rates, health effects of carbon monoxide and more.
Logarithmic unit used to describe ratios of signal levels - like power or intensity - to a reference level.
Sound pressure filters that compensates for the hearing sensed by the human ear.
Acceptable noise - dBA - level at typical common locations.
In a room the sound or noise will reach the receiver as direct and reverberant sound.
An introduction to the nature of sound with frequencies, wave-lengths and octaves.
Shift in hearing threshold for men and women vs. age.
Room sound absorption and absorption coefficients for common materials like plaster walls, brickwork, plywood panels and more.
Acoustic power of sound per unit area.
Introduction to decibel, sound power, intensity and pressure.
Sound power from sources like fans, jet engines, cars, humans and more.
Sound Pressure is the force of sound on a surface perpendicular to the propagation of sound.
OSHA maximum A-weighted sound pressure levels allowed per day.
Calculate the speed of sound (the sonic velocity) in gases, fluids or solids.
Change in sound pressure level and the subjective human perception.
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