Impairment created when two frequencies interact to create an erroneous frequency, in turn distorting the data signal representation.
Distortion generated by the faulty mixture of different input frequencies. This is a primary cause of harshness and lack of intelligibility in a hearing aid.
(in loudspeakers) Is the distortion generated in single cone speakers when the cone is reproducing a high and low frequency simultaneously. The high frequency peaks will be flattened off if the low frequency is distorted in any way. also see: AKA: Antonym: Source: http://www.the12volt.com/glossary/glossary.asp
A form of audio distortion caused by the modulation of a signal harmonic by another harmonic resulting in the creation of additional harmonics equal to both the sum and the difference of the original frequencies.
the intermixing of two frequencies. It is often caused by non-linear distortion within an amplifier or loudspeaker system
The interaction of two or more frequencies in a signal that results in the generation of new frequency components not present in the original signal. These new components have frequencies equal to the sum and difference of the frequencies of the original signals, and integral multiples thereof. IMD is often a major issue in loudspeaker design due to the varying permutations of issues that arise as a speaker cone moves back and forth.
Distortion created when a nonlinear device is driven by multiple tones. Intermodulation distortion products are complex multiples and submultiples of the test signals, making them more easily audible than the harmonic distortion products which are simultaneously created in such a test. Music, being a complex signal, generates abundant intermodulation distortion when processed by a nonlinear device. See: Harmonic Distortion, Non-Linear Distortion.
Form of interference involving the generation of interfering beats between two or more carriers according to the frequency relationship f = nf1 ± mf2, where n and m are whole numbers (but not zero), with appropriate expansion for additional carriers.
Distortion caused by one signal beating with another signal and producing frequencies that are both the sum and the difference of the original frequencies.
Electronically similar to mechanical Doppler distortion in that it results from a higher-frequency signal distorting as it rides on one of lower frequency. Unlike Doppler distortion, the one-dimensional nature of IMD within an electronic component can make it quite audible. See also Doppler distortion.
The distortion produced by nonlinear impedance in a component or system when two or more signals with distinct frequencies are present. Intermodulation products occur at the sums and differences of all harmonics of the original signals.
IMD is a phenomenon in which nonlinearity in a circuit or device creates new frequency components not in the original signal. IMD includes the effects of harmonic distortion and two-tone distortion. It is measured as the total power of those selected intermodulation products (i.e., IM2 through IM5) to the total power of the two input signals, f1 and f2. The signals f1 and f2 are of equal amplitude and very close to one another in frequency. The 2nd- to 5th-order intermodulation products are as follows: 2nd-order intermodulation products (IM2): f1 + f2, f2 - f1 3rd-order intermodulation products (IM3): 2 x f1 - f2, 2 x f2 - f1, 2 x f1 + f2, 2 x f2 + f1 4th-order intermodulation products (IM4): 3 x f1 - f2, 3 x f2 - f1, 3 x f1 + f2, 3 x f2 + f1 5th-order intermodulation products (IM5): 3 x f1 - 2 x f2, 3 x f2 - 2 x f1, 3 x f1 + 2 x f2, 3 x f2 + 2 x f1.
A meausurement of audio equipment designed to calculate the products of distortion produced by nonlinearities in the unit that cause distortion that is not harmonically related to the original waveform. In English, the measurement quantifies harmonic distortion that is not a function of the original signal; instead it is a measurement of the distortion introduced into the signal by the equipment and/or circuitry itself.
A type of distortion, falling into the "undesirable altering of the audio waveform" category, created by the interaction of two or more frequencies in an audio signal that results in the generation of new frequencies, not present in the original audio signal. These new frequencies are equal to the sum and difference of the frequencies of the original signals, and subsequent multiples thereof. In addition to finding intermodulation in loudspeaker design, the same principle applies to similar phenomena found in radio frequency coordination, of interest when using many RF microphones in a heavily rf-populated area. The common multiples that are checked when coordinating radio frequencies are the third-order and fifth-order multiples.
Distortion created by a device that is not harmonic with the original signal. Since it is not harmonics of the original signal, intermodulation distortion is often described as "harsh and grating," and tends to be more noticeable than harmonic distortion. Intermodulation distortion is often the result of poor amplifier design or the use of excessive amounts of negative feedback in the circuit. Systems that are fatiguing to listen to often have high rates of intermodulation distortion.