intermodulation distortion - définition. Qu'est-ce que intermodulation distortion
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Qu'est-ce (qui) est intermodulation distortion - définition

NON-LINEAR EFFECT IN AMPLITUDE MODULATION
Intermodulation distortion; Intermodulation product; Intermod; IMD3; Intermodulation noise; Cross modulation; Intermodulation interference; Intermodulations; Imd3; Intermodulatin distortion; Cross-modulation; Passive Intermodulation; Passive intermodulation; Third-order intermodulation distortion; Passive inter-modulation
  • 3rd order intermodulation products (D3 and D4) are the result of nonlinear behavior of an amplifier. The input power level into the amplifier is increased by 1 dB in each successive frame. The output power of the two carriers (M1 and M2) increases by about 1 dB in each frame, while the 3rd order intermodulation products (D3 and D4) grow by 3 dB in each frame. Higher-order intermodulation products (5th order, 7th order, 9th order) are visible at very high input power levels as the amplifier is driven past saturation. Near saturation, each additional dB of input power results in proportionally less output power going into the amplified carriers and proportionally more output power going into the unwanted intermodulation products. At and above saturation, additional input power results in a ''decrease'' in output power, with most of that additional input power getting dissipated as heat and increasing the level of the non-linear intermodulation products with respect to the two carriers.
  • A [[frequency spectrum]] plot showing intermodulation between two injected signals at 270 and 275 MHz (the large spikes).  Visible intermodulation products are seen as small spurs at 280 MHz and 265 MHz.

intermodulation distortion         
<electronics, communications> (IMD) Nonlinear distortion in a system or transducer, characterised by the appearance in the output of frequencies equal to the sums and differences of integral multiples of the two or more component frequencies present in the input waveform. (2000-08-21)
Intermodulation         
Intermodulation (IM) or intermodulation distortion (IMD) is the amplitude modulation of signals containing two or more different frequencies, caused by nonlinearities or time variance in a system. The intermodulation between frequency components will form additional components at frequencies that are not just at harmonic frequencies (integer multiples) of either, like harmonic distortion, but also at the sum and difference frequencies of the original frequencies and at sums and differences of multiples of those frequencies.
Reality distortion field         
USE OF CHARISMA TO AFFECT THE PERCEPTIONS OF OTHERS
Reality-distortion field; Reality Distortion Field; Reality distortion fields; Reality distortion; Reality Distortion
Reality distortion field (RDF) is a term first used by Bud Tribble at Apple Computer in 1981, to describe company co-founder Steve Jobs' charisma and its effects on the developers working on the Macintosh project. Tribble said that the term came from Star Trek, where in the episode "The Menagerie", it was used to describe how the aliens created their own new world through mental force.

Wikipédia

Intermodulation

Intermodulation (IM) or intermodulation distortion (IMD) is the amplitude modulation of signals containing two or more different frequencies, caused by nonlinearities or time variance in a system. The intermodulation between frequency components will form additional components at frequencies that are not just at harmonic frequencies (integer multiples) of either, like harmonic distortion, but also at the sum and difference frequencies of the original frequencies and at sums and differences of multiples of those frequencies.

Intermodulation is caused by non-linear behaviour of the signal processing (physical equipment or even algorithms) being used. The theoretical outcome of these non-linearities can be calculated by generating a Volterra series of the characteristic, or more approximately by a Taylor series.

Practically all audio equipment has some non-linearity, so it will exhibit some amount of IMD, which however may be low enough to be imperceptible by humans. Due to the characteristics of the human auditory system, the same percentage of IMD is perceived as more bothersome when compared to the same amount of harmonic distortion.

Intermodulation is also usually undesirable in radio, as it creates unwanted spurious emissions, often in the form of sidebands. For radio transmissions this increases the occupied bandwidth, leading to adjacent channel interference, which can reduce audio clarity or increase spectrum usage.

IMD is only distinct from harmonic distortion in that the stimulus signal is different. The same nonlinear system will produce both total harmonic distortion (with a solitary sine wave input) and IMD (with more complex tones). In music, for instance, IMD is intentionally applied to electric guitars using overdriven amplifiers or effects pedals to produce new tones at subharmonics of the tones being played on the instrument. See Power chord#Analysis.

IMD is also distinct from intentional modulation (such as a frequency mixer in superheterodyne receivers) where signals to be modulated are presented to an intentional nonlinear element (multiplied). See non-linear mixers such as mixer diodes and even single-transistor oscillator-mixer circuits. However, while the intermodulation products of the received signal with the local oscillator signal are intended, superheterodyne mixers can, at the same time, also produce unwanted intermodulation effects from strong signals near in frequency to the desired signal that fall within the passband of the receiver.