Can the term distortion be used interchangeably?

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Discussion Overview

The discussion revolves around the use of the term "distortion" in audio contexts, particularly whether it can be used interchangeably with other terms or concepts. Participants explore various forms and classifications of distortion, including its implications in signal processing and speaker performance.

Discussion Character

  • Debate/contested

Main Points Raised

  • One participant suggests that while a clipped sine wave is a form of distortion, the term may also refer to the loudspeaker's performance when it bottoms out, indicating that distortion can arise from the speaker rather than the signal itself.
  • Another participant questions what "interchangeably" refers to, proposing that distortion encompasses anything that deviates from the expected signal, emphasizing that the output from the speaker can still be considered distortion even if the input signal is not distorted.
  • A third participant defines distortion as any change in waveform shape relative to expectations, listing various types such as amplitude distortion, jitter distortion, and frequency response distortion, while noting that noise may be considered separately.
  • One participant adds that changes in the frequency spectrum and harmonics indicate distortion, while the appearance of non-harmonic frequency components is classified as noise.
  • Another participant argues that aliasing artifacts qualify as distortion, suggesting that the definition of distortion can be broadened to include any artifacts correlated with the input signal.

Areas of Agreement / Disagreement

Participants express differing views on the definition and scope of distortion, with no consensus reached on whether it can be used interchangeably with other terms or concepts.

Contextual Notes

Participants highlight the complexity of defining distortion, noting various forms and contexts in which it may apply, but do not resolve the implications of these definitions.

StarsFly
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Can the term "distortion" be used interchangeably?

Clipped sine wave = distortion

Assume I run a 30hz tone through one of my dedicated mid-range loudspeakers. There's no doubt that the loudspeaker would bottom out. People often call this distortion. But the signal never clipped. It's the loudspeaker that's distorting.

I assume distortion can be classified into...?
 
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Can the term "distortion" be used interchangeably?
"... interchangeably" with what?

I assume distortion can be classified into...?
Anything that is distorted.
If the signal is not distorted when it arrives at the speaker, then the term "distortion" does not apply to the signal. But the signal response of the output (speaker) may, yet, distort the sound. That is still distortion.

A clipped signal is only one form of distortion - it's a very broad term.
 
Distortion means anything different (about the waveform shape) than what you expect wherever you measure it. It can be be amplitude distortion, jitter distortion, aliasing distortion, speaker distortion, frequency response distortion, crossover distortion, whatever. Noise is sometimes considered separately, but not always (noise floor, quantizing noise, whatever).
 
If you look at the frequency spectrum and the harmonics change in amplitude or phase relative to the fundamental then the signal is distorting.

If additional frequency components appear that are not harmonics of the fundamental then it is called noise.
 
I think aliasing artifacts are considered distortion and they are not harmonic. I think you can (these days) expand distortion to include any artifacts that are correlated to the input signal.
 

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