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A decibel (dB) is a unit of measurement for the ratio of two values of power or root-power quantities on a logarithmic scale. It is widely used in acoustics, electronics and telecommunications, and originated from the measurement of transmission loss in telephony.
Sound pressure is the local deviation of atmospheric pressure caused by a sound wave. Learn how to measure sound pressure level, sound intensity, acoustic impedance and particle displacement, and see examples of sound sources and their effects.
Signal-to-noise ratio (SNR) is a measure of how much a desired signal exceeds the background noise in a system. SNR can be calculated in different ways, such as power ratio, decibels, or dynamic range, and depends on the context and application.
Sound intensity is the power carried by sound waves per unit area in a direction perpendicular to that area. Sound intensity level is a logarithmic expression of sound intensity relative to a reference value, and can be measured by using a sound intensity p-u probe or a p-p probe.
Sound power is the rate of sound energy emission, reflection, transmission or reception per unit time. Learn how to calculate sound power level, sound intensity and sound energy density, and see a table of sound power levels for various sources.
While describing sound in terms of sound pressure, a logarithmic conversion is usually applied and the sound pressure level is stated instead, in decibels (dB), with 0 dB SPL equal to 20 micropascals. A microphone is distinguishable by the voltage value produced when a known, constant root mean square sound pressure is applied. This is known as ...
The absolute threshold of hearing is the minimum sound level of a pure tone that an average human ear can hear. It is frequency-dependent and reaches as low as -9 dB SPL at 2-5 kHz.
Sound is a vibration that propagates as an acoustic wave through a medium and can be perceived by humans or animals. Learn about the properties, types, and effects of sound waves, as well as the interdisciplinary science of acoustics and its subfields.