Radio Frequency Interference - Definition. Was ist Radio Frequency Interference
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Was (wer) ist Radio Frequency Interference - definition

DISTURBANCE IN AN ELECTRICAL CIRCUIT DUE TO EXTERNAL SOURCES OF RADIO WAVES
Radio Frequency Interference; Electromagnetic noise; Radio frequency interference; Radio interference; RF interference; Electromagnetic Interference; Dirty power; Distortion (electronic circuits); Electrical interference; Electromagnetic influence; EM interference; Conducted electromagnetic interference; Intentional EMI; Conducted Electromagnetic Interference; Radio-frequency interference; Electro-magnetic interference; Radiofrequency interference; Harmful interference; Radio Frecuency Interference; Radio-frequency-interference
  • Interference by 5 GHz Wi-Fi seen on Doppler weather radar
  • Electromagnetic interference in analog TV signal
  • Recording of US House of Representatives debate on October 8, 2002, interrupted and distorted by electromagnetic interference from a [[solar flare]] at approximately 4:30p.m.

Radio Frequency Interference         
<hardware, testing> (RFI) Electromagnetic radiation which is emitted by electrical circuits carrying rapidly changing signals, as a by-product of their normal operation, and which causes unwanted signals (interference or noise) to be induced in other circuits. The most important means of reducing RFI are: use of bypass or "decoupling" capacitors on each active device (connected across the power supply, as close to the device as possible), risetime control of high speed signals using series resistors and VCC filtering. Shielding is usually a last resort after other techniques have failed because of the added expense of RF gaskets and the like. The efficiency of the radiation is dependant on the height above the ground or power plane (at RF one is as good as the other) and the length of the conductor in relationship to the wavelength of the signal component (fundamental, harmonic or transient (overshoot, undershoot or ringing)). At lower frequencies, such as 133 MHz, radiation is almost exclusively via I/O cables; RF noise gets onto the power planes and is coupled to the line drivers via the VCC and ground pins. The Rf is then coupled to the cable through the line driver as common node noise. Since the noise is common mode, shielding has very little effect, even with differential pairs. The RF energy is capacitively coupled from the signal pair to the shield and the shield itself does the radiating. At higher frequencies, usually above 500 Mhz, traces get electrically longer and higher above the plane. Two techniques are used at these frequencies: wave shaping with series resistors and embedding the traces between the two planes. If all these measures still leave too much RFI, sheilding such as RF gaskets and copper tape can be used. Most digital equipment is designed with metal, or coated plastic, cases. Switching power supplies can be a source of RFI, but have become less of a problem as design techniques have improved. Most countries have legal requirements that electronic and electrical hardware must still work correctly when subjected to certain amounts of RFI, and should not emit RFI which could interfere with other equipment (such as radios). See also Electrostatic Discharge, {Electromagnetic Compatibility}. (1998-01-26)
Electromagnetic interference         
Electromagnetic interference (EMI), also called radio-frequency interference (RFI) when in the radio frequency spectrum, is a disturbance generated by an external source that affects an electrical circuit by electromagnetic induction, electrostatic coupling, or conduction.Based on the "interference" entry of The Concise Oxford English Dictionary, 11th edition, online The disturbance may degrade the performance of the circuit or even stop it from functioning.
Wave interference         
  • Cropped tomography scan animation of laser light interference passing through two pinholes (side edges).
  • A magnified image of a coloured interference pattern in a soap film. The "black holes" are areas of almost total destructive interference (antiphase).
  • Interference fringes in overlapping plane waves
  • Creation of interference fringes by an [[optical flat]] on a reflective surface.  Light rays from a monochromatic source pass through the glass and reflect off both the bottom surface of the flat and the supporting surface.   The tiny gap between the surfaces means the two reflected rays have different path lengths. In addition the ray reflected from the bottom plate undergoes a 180° phase reversal.  As a result, at locations '''''(a)''''' where the path difference is an odd multiple of λ/2, the waves reinforce.   At locations '''''(b)''''' where the path difference is an even multiple of λ/2 the waves cancel.  Since the gap between the surfaces varies slightly in width at different points, a series of alternating bright and dark bands, ''interference fringes'', are seen.
  • White light interference in a [[soap bubble]]. The [[iridescence]] is due to [[thin-film interference]].
  • Interference of waves from two point sources.
  • interferometric array]] formed from many smaller [[telescope]]s, like many larger [[radio telescope]]s.
  • Interference of right traveling (green) and left traveling (blue) waves in Two-dimensional space, resulting in final (red) wave
WHEN TWO WAVES SUPERPOSE TO FORM A NEW WAVE
Interference pattern; Constructive interference; Phase cancellation; Constructive Interference; Interference Pattern; Interference (wave motion); Interference fringe; Destructive interference; Quantum Interference; Destructive Interference; Interference Fringe; Interference of waves; Quantum interference; Interferogram; Antisound; Optical interference; Interference (Physics); Interference (physics); Light interference; Interference (optics); Interference pattern (disambiguation); Interference (light); Complete Destructive interference; Interference (wave propagation)
In physics, interference is a phenomenon in which two waves combine by adding their displacement together at every single point in space and time, to form a resultant wave of greater, lower, or the same amplitude. Constructive and destructive interference result from the interaction of waves that are correlated or coherent with each other, either because they come from the same source or because they have the same or nearly the same frequency.

Wikipedia

Electromagnetic interference

Electromagnetic interference (EMI), also called radio-frequency interference (RFI) when in the radio frequency spectrum, is a disturbance generated by an external source that affects an electrical circuit by electromagnetic induction, electrostatic coupling, or conduction. The disturbance may degrade the performance of the circuit or even stop it from functioning. In the case of a data path, these effects can range from an increase in error rate to a total loss of the data. Both man-made and natural sources generate changing electrical currents and voltages that can cause EMI: ignition systems, cellular network of mobile phones, lightning, solar flares, and auroras (northern/southern lights). EMI frequently affects AM radios. It can also affect mobile phones, FM radios, and televisions, as well as observations for radio astronomy and atmospheric science.

EMI can be used intentionally for radio jamming, as in electronic warfare.

Beispiele aus Textkorpus für Radio Frequency Interference
1. The various manufacturers claim that their cables will filter out radio frequency interference in the power cable, and that this will improve the sound.