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2. Sound level meter - Wikipedia

   en.wikipedia.org/wiki/Sound_level_meter

   A sound level meter (also called sound pressure level meter ( SPL )) is used for acoustic measurements. It is commonly a hand-held instrument with a microphone. The best type of microphone for sound level meters is the condenser microphone, which combines precision with stability and reliability. [1] The diaphragm of the microphone responds to ...

3. Decibel - Wikipedia

   en.wikipedia.org/wiki/Decibel

   The decibel (symbol: dB) is a relative unit of measurement equal to one tenth of a bel ( B ). It expresses the ratio of two values of a power or root-power quantity on a logarithmic scale. Two signals whose levels differ by one decibel have a power ratio of 10 1/10 (approximately 1.26) or root-power ratio of 10 1/20 (approximately 1.12 ).

4. Peak meter - Wikipedia

   en.wikipedia.org/wiki/Peak_meter

   A peak meter is a type of measuring instrument that visually indicates the instantaneous level of an audio signal that is passing through it (a sound level meter ). In sound reproduction, the meter, whether peak or not, is usually meant to correspond to the perceived loudness of a particular signal. The term peak is used to denote the meter's ...

5. dBm - Wikipedia

   en.wikipedia.org/wiki/DBm

   dBm or dBmW (decibel-milliwatts) is a unit of power level expressed using a logarithmic decibel (dB) scale respective to one milliwatt (mW). It's a quick-and-dirty metric commonly used by radio, microwave and fiber-optical communication technicians & engineers to measure the power of system transmissions on a log scale, which can express both ...

6. Noise measurement - Wikipedia

   en.wikipedia.org/wiki/Noise_measurement

   There are a number of standards for noise measurement, each with a different goal or focus, including: Standard:ITU-R BS 468 widely used in Broadcasting and professional Audio. Standard:IEC A-weighting is widely used in Environmental Noise measurement. Standard:CCITT 0.41 refers to ' Psophometric weighting ' used on telephone circuits.

7. Sound intensity - Wikipedia

   en.wikipedia.org/wiki/Sound_intensity

   Sound intensity, also known as acoustic intensity, is defined as the power carried by sound waves per unit area in a direction perpendicular to that area. The SI unit of intensity, which includes sound intensity, is the watt per square meter (W/m 2 ). One application is the noise measurement of sound intensity in the air at a listener's ...