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In electronics, motorboating is a type of low frequency parasitic oscillation (unwanted cyclic variation of the output voltage) that sometimes occurs in audio and radio equipment and often manifests itself as a sound similar to an idling motorboat engine, a "put-put-put", in audio output from speakers or earphones.
The torsional deflection of a simple cylinder cannot radiate efficiently acoustic noise, but with particular boundary conditions the stator can radiate acoustic noise under torque ripple excitation. [8] Structure-borne noise can also be generated by torque ripple when rotor shaft line vibrations propagate to the frame [9] and shaft line.
Television and radio receivers; Industrial, scientific and medical equipment (ISM) Digital processing circuitry such as microcontrollers; Switched-mode power supplies (SMPS) Broadband noise may be spread across parts of either or both frequency ranges, with no particular frequency accentuated. Sources include: Solar activity
Mains hum, electric hum, cycle hum, or power line hum is a sound associated with alternating current which is twice the frequency of the mains electricity.The fundamental frequency of this sound is usually double that of fundamental 50/60 Hz, i.e., 100/120 Hz, depending on the local power-line frequency.
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 ...
"There's a strange noise coming through the speaker," Williams said "I don't know what's making it," he later added. The conversation was uploaded by a NASA Space Flight forum member on Saturday ...
Component speakers: These speakers are designed for higher-end car audio systems and typically consist of separate woofers, tweeters, and crossovers. This allows for more precise sound tuning and a higher level of sound quality. Subwoofers: These speakers are designed to reproduce low-frequency sounds, particularly bass.
Measurement from a spectrum analyzer showing a noise-like measurement from an unspecified component.. In signal theory, the noise floor is the measure of the signal created from the sum of all the noise sources and unwanted signals within a measurement system, where noise is defined as any signal other than the one being monitored.