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ITU-R 468 noise weighting - Wikipedia
https://en.wikipedia.org/wiki/ITU-R_468_noise_weighting#:~:text=ITU-R%20468%20%28originally%20defined%20in%20CCIR%20recommendation%20468-4%2C,widely%20used%20when%20measuring%20noise%20in%20audio%20systems.
Noise In Audio Amplifiers - sound-au.com
https://www.sound-au.com/noise.htm
Using reasonably typical values we can assume a reference resistance of 200Ω (this is a standard value for most noise tests, but RF tests are usually done with 50Ω), an absolute temperature of 300K (27°C which is very common inside enclosures) and 20kHz bandwidth. This gives the noise from the resistance alone as 0.257µV (257nV).
The Design of Low-noise Audio-frequency Amplifiers
http://www.keith-snook.info/Stuff-you-should-read/Faulkner%20-%20The%20design%20of%20Low-noise%20audio%20frequency%20amplifiers.pdf
Now if we calculate the way in which the noise figure of the most general linear amplifier can vary with Rs, making no assump tions apart from that of linearity, we find the relation F = 1+kl/Rs+Rs/k2+k3 ...... (4) July 1968 where kl, k2 and 3 are constants of the amplifier, all being in general functions of frequency.
Assessment of noise: technical advice note - gov.scot
https://www.gov.scot/publications/technical-advice-note-assessment-noise/pages/6/
To assess the likelihood of complaints, the measured background noise level is subtracted from the adjusted rating level, the greater the difference the greater the likelihood of complaints. A difference of around + 10 dB or more indicates that complaints are likely. A difference of around + 5 dB is of marginal significance.
Noise Calculations1 in Op Amp Circuits - Analog …
https://www.analog.com/media/en/reference-design-documentation/design-notes/dn015f.pdf
rent noise is the noise density frequency response curve as shown in Figure 1. There are two –distinct regions to consider: 1. The high frequency part of the curve shows the shot noise and is independent of frequency. 2. The low frequency part of the curve is the 1/f noise as shown by a rapidly increasing noise density. In low frequency ...
11 Myths About Analog Noise Analysis - Analog Devices
https://www.analog.com/en/technical-articles/11-myths-about-analog-noise-analysis.html
The History of Low-Level Audio Background Noise …
https://realfield.com/anm/history/
According to this, the best agreement between measurements of the audio-frequency noise and the subjective assessment is obtained with the help of a modified version of the sound level meter by Niese [#Niese-1958] and a weighting curve according to fig. 1 (lb) in Rec. 468-3. This is confirmed by studies conducted in Great Britain and the Federal Republic of Germany, the …
Report #1: Noise Measurement Report
https://hcbf.org/wp-content/uploads/2014/06/2012.12.14.Report-1.Wilmington-Noise-Measurement-Report_with-Attachments3.pdf
Sound is technically described in terms of the loudness (amplitude) of the sound and frequency (pitch) of the sound. The standard unit of measurement of the loudness of sound is the decibel (dB). Decibels are based on the logarithmic scale. The logarithmic scale compresses the wide range in sound pressure levels to a more usable range of numbers in a …
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