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2. Sound power - Wikipedia

   en.wikipedia.org/wiki/Sound_power

   TL. v. t. e. Sound power or acoustic power is the rate at which sound energy is emitted, reflected, transmitted or received, per unit time. [1] It is defined [2] as "through a surface, the product of the sound pressure, and the component of the particle velocity, at a point on the surface in the direction normal to the surface, integrated over ...

3. Phase noise - Wikipedia

   en.wikipedia.org/wiki/Phase_noise

   Phase noise is a type of cyclostationary noise and is closely related to jitter, a particularly important type of phase noise that is produced by oscillators . Phase noise ( ℒ (f)) is typically expressed in units of dBc /Hz, and it represents the noise power relative to the carrier contained in a 1 Hz bandwidth centered at a certain offsets ...

4. Noise figure - Wikipedia

   en.wikipedia.org/wiki/Noise_figure

   The noise figure is the difference in decibel (dB) between the noise output of the actual receiver to the noise output of an "ideal" receiver with the same overall gain and bandwidth when the receivers are connected to matched sources at the standard noise temperature T0 (usually 290 K).

5. Day-night average sound level - Wikipedia

   en.wikipedia.org/wiki/Day-Night_Average_Sound_Level

   Day-night average sound level. The day-night average sound level (Ldn or DNL) is the average noise level over a 24-hour period. The noise level measurements between the hours of 22:00 and 07:00 are artificially increased by 10 dB before averaging. This noise is weighted to take into account the decrease in community background noise of 10 dB ...

6. European Union energy label - Wikipedia

   en.wikipedia.org/wiki/European_Union_energy_label

   A new energy label, introduced in 2010, is based on the energy efficiency index (EEI), and has energy classes in the range A+++ to D. [11] The EEI is a measure of the annual electricity consumption, and includes energy consumed during power-off and standby modes, and the energy consumed in 220 washing cycles.

7. Noise temperature - Wikipedia

   en.wikipedia.org/wiki/Noise_temperature

   The noise factor (a linear term) is more often expressed as the noise figure (in decibels) using the conversion: = ⁡ The noise figure can also be seen as the decrease in signal-to-noise ratio (SNR) caused by passing a signal through a system if the original signal had a noise temperature of 290 K. This is a common way of expressing the noise ...