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Different types of noise are generated by different devices and different processes. Thermal noise is unavoidable at non-zero temperature (see fluctuation-dissipation theorem), while other types depend mostly on device type (such as shot noise, [1] [3] which needs a steep potential barrier) or manufacturing quality and semiconductor defects, such as conductance fluctuations, including 1/f noise.
As a static force, it does not create vibrations nor acoustic noise. However torque ripple (also called cogging torque for permanent magnet synchronous machines in open circuit), which represents the harmonic variations of electromagnetic torque, is a dynamic force creating torsional vibrations of both rotor and stator.
Noise may arise in signals of interest to various scientific and technical fields, often with specific features: Noise (audio), such as "hiss" or "hum", in audio signals Background noise, due to spurious sounds during signal capture; Comfort noise, added to voice communications to fill silent gaps
The amplifying devices in audio and radio equipment are vulnerable to a variety of feedback problems, which can cause distinctive noise in the output. The term motorboating is applied to oscillations whose frequency is below the range of hearing, from 1 to 10 hertz, [3] so the individual oscillations are heard as pulses.
When recording through an audio interface, insufficient computer performance or audio driver issues can cause clicks, pops and dropouts. They can result from improper clock sources [3] and buffer size. Also, clicks can be caused by electric devices near the computer or by faulty audio or mains cables. [4]
The basic arrangement of noise emitter or source, coupling path and victim, receptor or sink is shown in the figure below. Source and victim are usually electronic hardware devices, though the source may be a natural phenomenon such as a lightning strike, electrostatic discharge (ESD) or, in one famous case, the Big Bang at the origin of the ...
Radio noise near in frequency to a received radio signal (in the receiver's passband) interferes (RFI) with the operation of the receiver's circuitry.The level of noise determines the maximum sensitivity and reception range of a radio receiver; if no noise were picked up with radio signals, even weak transmissions could be received at virtually any distance by making a radio receiver that had ...
The device is described as a combination white noise generator and AM radio receiver modified to sweep back and forth through the AM band selecting split-second snippets of sound. Critics of the device say its effect is subjective and incapable of being replicated, and since it relies on radio noise, any meaningful response a user gets is ...