slew-induced distortion

Slew-induced distortion (SID or slew-rate induced distortion) is caused when an amplifier or transducer is required to change output (or displacement), i.e. slew rate, faster than it is able to do so without error.[https://web.archive.org/web/20190303175101/http://pdfs.semanticscholar.org/cdbd/3ffcb276aabaf6cccd9b6bf067ee665c82d9.pdf ] An Overview of SID and TIM by Walter G. Jung, Mark L. Stephens, and Craig C. Todd in Audio, June 1979; At such times any other signals may suffer considerable gain distortion, leading to intermodulation distortion.http://www.aes.org/par/i/#IM AES Pro Audio Reference for Intermodulation Distortion Transient intermodulation distortion may involve some degree of SID and/or distortion due to peak compression.

These are effects that tend to occur only during parts of a waveform fed through audio amplifiers, that may give rise to audible degradation of the sound quality in music, even when fixed-frequency harmonic distortion tests show low amounts of distortion for a simple sinewave test signal.{{dubious|date=May 2015}}{{citation needed|date=May 2015}}

TIM (Transient Intermodulation Distortion) was first discovered by Matti Otala in the 1960s due to accidentally wiring an amplifier incorrectly.{{cite web |url=http://www.q-audio.com/johncurl.pdf |title=Condemnation without Examination is Prejudice |last=Curl |first=John |date=May 2006 |website=Q Audio |location=Sacramento, California |page=9 |archive-url=https://web.archive.org/web/20131110011700/http://www.q-audio.com/johncurl.pdf |archive-date=2013-11-10 |url-status=dead |quote=First, Matti Otala found, back in the 1960s, by accidentally miswiring a power amp, that negative feedback was a problem with the subjective performance of audio circuits. Otala found that when both the open loop bandwidth increased and the feedback was reduced, the amp sounded better.}}

References

Category:Audio effects