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Intermodulation Distortion (IMD)
https://sound-au.com/articles/intermodulation2.htm
Intermodulation Effects The effects of harmonic distortion are generally benign, provided the total measured distortion is less than 0.01%. In some cases it can be greater without becoming audible, but anything over 0.5% is decidedly 'lo-fi' (as opposed to 'hi-fi').
Intermodulation Distortion (IMD) Sound Test - Audio Check
https://www.audiocheck.net/testtones_imd.php
Intermodulation distortion (IMD) measures the level of unwanted combinations of different frequencies found in the input signal. IMD adds components to the sound that are not found in the original signal. This effect results from non-linearities in your audio system.
AES E-Library » Intermodulation Distortion Measurement
https://www.aes.org/e-lib/browse.cfm?elib=738
Two basic methods of distortion measurement are commonly used, namely (a) Single-signal harmonic distortion measurement and (b) two-signal intermodulation tortion measurement, dis- SINGLE SIGNAL METHOD The single-signal method is the simplest, but it has an inherent difficulty in that a signal having a very low distortion content is a prime necessity.
Intermodulation Distortion - Klippel
https://klippel.de/know-how/measurements/nonlinear-distortion/intermodulation-distortion.html
Intermodulation distortion can easily be detected by using a two-tone signal with varying frequencies of the excitation tones (“bass tone sweep” or “voice tone sweep”). The figure to the left illustrates the interpretation of the intermodulation distortion measurement using a fixed low frequency tone f 1 and a high frequency tone f 2 which is varied over the audio band (“voice …
DISTORTION MEASUREMENT IN AUDIO AMPLIFIERS
https://renardson-audio.com/distortiontest.pdf
measurement of intermodulation distortion (i.m.d.) in which input frequencies f1 and f2 generate distortion at frequencies nf1 + mf2 where n and m are positive or negative integers. The advantages of such measurements are: 1). Provided the two signal sources used are connected in such a way as to avoid any significant interaction the signal
More about IMD - Audio Precision
https://www.ap.com/technical-library/more-about-imd/
SMPTE IMD is a technique for measuring IMD (intermodulation distortion) according to the SMPTE RP120-1983 standard. The DIN intermodulation distortion technique uses a similar method. The stimulus is a strong low-frequency interfering signal (f1) combined with a weaker high frequency signal of interest (f2). f1 is usually 60 Hz and f2 is usually 7 kHz, …
Understanding Intermodulation Distortion Measurements ...
https://www.electronicdesign.com/technologies/communications/article/21798494/understanding-intermodulation-distortion-measurements
Intermodulation distortion is one of the most interesting signal analyzer measurements. Often abbreviated IMD, it is an important metric of linearity for a wide range of RF and microwave...
Intermodulation - Wikipedia
https://en.wikipedia.org/wiki/Intermodulation
Measurement. Intermodulation distortion in audio is usually specified as the root mean square (RMS) value of the various sum-and-difference signals as a percentage of the original signal's root mean square voltage, although it may be specified in terms of individual component strengths, in decibels, as is common with radio frequency work.
Harmonic and Intermodulation Distortion | Audio Science ...
https://www.audiosciencereview.com/forum/index.php?threads/harmonic-and-intermodulation-distortion.25436/
So, 1% distortion is 40 dB below the signal level. Recall that dB = 20log (x), 1% is 1/100 = 0.01, and 20log (0.01) = -40 dB. Aside: Power goes as 10log (x), so 1% distortion in power (Watts) is only -20 dB. In SPL (dB/W), 20 dB is about the difference between say a pretty loud sound (80 dB) and a normal conversational volume (60 dB).
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