11 Facts About Line noise

In electronics, Line noise is an unwanted disturbance in an electrical signal.

In particular, Line noise is inherent in physics, and central to thermodynamics.

Electronic Line noise is a common component of Line noise in signal processing.

In communication systems, Line noise is an error or undesired random disturbance of a useful information signal in a communication channel.

The Line noise is a summation of unwanted or disturbing energy from natural and sometimes man-made sources.

Different types of Line noise are generated by different devices and different processes.

Johnson–Nyquist Line noise is unavoidable, and generated by the random thermal motion of charge carriers, inside an electrical conductor, which happens regardless of any applied voltage.

Thermal Line noise is approximately white, meaning that its power spectral density is nearly equal throughout the frequency spectrum.

Where current divides between two paths, Line noise occurs as a result of random fluctuations that occur during this division.

Thermal Line noise can be reduced by cooling of circuits - this is typically only employed in high accuracy high value applications such as radio telescopes.

The spectral distribution of Line noise can vary with frequency, so its power density is measured in watts per hertz .