Slew-induced distortion: Difference between revisions
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| ⚫ | '''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.<ref>[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;</ref> At such times any other signals may suffer considerable gain distortion, leading to [[intermodulation distortion]].<ref>http://www.aes.org/par/i/#IM AES Pro Audio Reference for Intermodulation Distortion</ref> [[Transient intermodulation distortion]] may involve some degree of SID and/or [[distortion]] due to peak compression. |
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These are effects that tend to occur only during parts of a [[waveform]] fed through [[Sound recording and reproduction|audio]] [[amplifier]]s, that may give rise to audible degradation of the sound quality in music, even when fixed-[[frequency]] [[harmonic distortion]] [[audio system measurements|tests]] show low amounts of distortion for a simple [[sinewave]] test signal. |
These are effects that tend to occur only during parts of a [[waveform]] fed through [[Sound recording and reproduction|audio]] [[amplifier]]s, that may give rise to audible degradation of the sound quality in music, even when fixed-[[frequency]] [[harmonic distortion]] [[audio system measurements|tests]] show low amounts of distortion for a simple [[sinewave]] test signal.{{dubious|date=May 2015}}{{citation needed|date=May 2015}} |
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TIM (Transient Intermodulation Distortion) was first discovered by Matti Otala in the 1960s due to accidentally wiring an amplifier incorrectly.<ref name=johncurl>{{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.}}</ref> |
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==References== |
==References== |
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* An Overview of SID and TIM by Walter G. Jung, Mark L. Stephens, and Craig C. Todd in Audio, June 1979; |
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Latest revision as of 10:37, 24 June 2024
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.[1] At such times any other signals may suffer considerable gain distortion, leading to intermodulation distortion.[2] 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 – discuss][citation needed]
TIM (Transient Intermodulation Distortion) was first discovered by Matti Otala in the 1960s due to accidentally wiring an amplifier incorrectly.[3]
References
[edit]- ^ [1] An Overview of SID and TIM by Walter G. Jung, Mark L. Stephens, and Craig C. Todd in Audio, June 1979;
- ^ http://www.aes.org/par/i/#IM AES Pro Audio Reference for Intermodulation Distortion
- ^ Curl, John (May 2006). "Condemnation without Examination is Prejudice" (PDF). Q Audio. Sacramento, California. p. 9. Archived from the original (PDF) on 2013-11-10.
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.
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