Search results
Results from the WOW.Com Content Network
High frequency (HF) is the ITU designation [1] ... Noise, especially man-made interference from electronic devices, tends to have a great effect on the HF bands.
Violet noise is also called purple noise. Violet noise's power density increases 6.02 dB per octave with increasing frequency [8] [9] "The spectral analysis shows that GPS acceleration errors seem to be violet noise processes. They are dominated by high-frequency noise." (density proportional to f 2) over a finite frequency range.
A sensitive circuit will pick up this frequency as noise. A notch filter tuned to the line frequency can remove the noise. Thermal noise can be reduced by cooling of circuits - this is typically only employed in high accuracy high-value applications such as radio telescopes.
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 Mosquito or Mosquito alarm is a machine used to deter loitering by emitting sound at high frequency. In some versions, it is intentionally tuned to be heard primarily by younger people. Nicknamed "Mosquito" for the buzzing sound it plays, the device is marketed as a safety and security tool for preventing youths from congregating in ...
Figure 2. Johnson–Nyquist noise has a nearly a constant 4 k B T R power spectral density per unit of frequency, but does decay to zero due to quantum effects at high frequencies (terahertz for room temperature).
For premium support please call: 800-290-4726 more ways to reach us
White noise is commonly used in the production of electronic music, usually either directly or as an input for a filter to create other types of noise signal. It is used extensively in audio synthesis, typically to recreate percussive instruments such as cymbals or snare drums which have high noise content in their frequency domain. [8]