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Definition: Noise in a communication system is basically undesirable or unwanted signals that get randomly added to the actual information carrying signal. Resultantly, causes disturbances in the original signal being transmitted from an end to another.
White noise refers to a statistical model for signals and signal sources, rather than to any specific signal. White noise draws its name from white light, [2] although light that appears white generally does not have a flat power spectral density over the visible band . An image of white noise.
White noise is a random signal (or process) with a flat power spectral density. In other words, the signal contains equal power within a fixed bandwidth at any center frequency.
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In any communication system, during the transmission of the signal, or while receiving the signal, some unwanted signal gets introduced into the communication, making it unpleasant for the receiver, questioning the quality of the communication. Such a disturbance is called as Noise.
May 5, 2014 · White noise is also known as additive white Gaussian noise (AWGN). Techopedia Explains White Noise. White noise is more of a kind of signal aggregation than a specific type of distributed spectrum noise. It often sounds like hissing to the human ear.
Internal noise in communication, i.e. noises which get, generated within the receiver or communication system. Internal noise may be put into the following four categories. Thermal noise or white noise or Johnson noise ; Shot noise. Transit time noise; Miscellaneous internal noise.
Noise can be defined as any unwanted signals, random or deterministic, which interfere with the faithful reproduction of the desired signal in a system. Stated another way, any interfering signal, which is usually noticed as random fluctuations in voltage or current tending to obscure and mask the desired signals is known as noise.
