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The noise cancelling link goes to Active Noise Control. This is probably because noise cancelling headphones are covered under this topic.
Adaptive Noise Cancelling and Active Noise Control are similar sounding terms but are in fact different topics in different scientific disciplines with some incidental overlap. Active Noise Control is a topic in the field of acoustics and Adaptive Noise Cancelling is topic in the field of adaptive systems and signal processing.
Active noise control is an area of acoustics that deals with the suppression of sounds that represent noise in physical spaces by introducing another version of the noise sound. In this context 'noise' means noise in the commonly used sense of an undesirable sound that one can hear.
According to the Active Noise Control article this has apparently been attempted without adaptive techniques, long before the development of adaptive noise cancelling techniques in signal processing emerged. However, once adaptive noise cancelling emerged as a technique in signal processing it was adopted as a technique that could also be used in acoustic active noise control.
As the draft article explains, Adaptive Noise Cancelling is a technique evolved from work in adaptive filters and had nothing to do with work in active noise control in acoustics. In Adaptive Noise Cancelling 'noise' refers to any interference that is corrupting a target signal in communication or control - an artefact in electric or electromagnetic signals. The terms 'noise' and 'interference' in this context are used interchangeably. In fact in the book Adaptive Signal Processing by Widrow and Stern the chapter that deals with adaptive noise cancelling is entitled "Adaptive Interference Cancelling". However, the term "adaptive noise cancelling" is the term now well established and widely used.
So the application of adaptive noise cancelling in active noise control is somewhat incidental and represents an intersection between the two fields that is a minute part of both fields. Active (acoustic) noise cancelling can be done with or without adaptive techniques and only a few noise cancelling headphones use adaptive processing. On the other hand, active noise control is just one of the many applications of adaptive noise cancelling (see the draft article).
So Active Noise Control and Adaptive Noise Cancelling are two separate topics that are appropriately dealt with by separate articles that reference each other. John Kaunitz (talk) 02:51, 29 January 2023 (UTC)[reply]
Yes, I agree that Active Noise Control and Adaptive Noise Cancelling are two separate topics. However, I think that Adaptive Noise Cancelling should be covered under Adaptive filtering, to avoid duplication.
Wikipedia is many things. One of these things is that it is disorganized. We have a lot of articles that largely duplicate other articles. That is not inherently a problem, if the duplicated information is correct and consistent. The problem is maintaining the articles. You may think that once you write the article and get it right, that it will be done. Unfortunately, there is constant vandalism. Right now, for every active experienced editor there are 1000 articles. I have about 900 articles on my watch list. If I was watching my fair share, I would have about 2000 because many of the active editors are doing other things. Almost all my time goes into article preservation.
Lots of times vandalism is obvious. It’s a few random words of nonsense or foul language. We have a bot that does a good job of fixing that. But sometimes, it is subtle, like changing a single plus sign to a negative sign. It is not obvious that it is vandalism. It might be a legitimate correction. Someone, like me, must look at the change and determine if it is correct. If it is not correct, we also must look at the editor to see if he or she is showing a pattern of such changes to determine if they are a deliberate vandal or just a good faith editor making mistakes.
So, I groan (I guess I’m getting old and weary) when someone wants to add an article that seems largely redundant (to me) with another article. But it won’t make the whole thing collapse. But it provides more target for the vandals. Constant314 (talk) 03:05, 29 January 2023 (UTC)[reply]
I would have thought that the major considerations in presenting a topic on Wikipedia is its notability and how to best serves the requirements of potential Wikipedia users who google the term. As I see it, users are looking for concise easy-to-understand articles that provide answers to questions relating to notable topics, such as: What is it? What does it do? How does it work? How did it arise? Where is it relevant? The Adaptive Noise Cancelling draft was produced with this in mind, given that no such article currently exist.
Adaptive filters and the LMS algorithm, key to concept, were invented by Widrow and Hoff around 1960 at Stanford. The extensive analysis of adaptive filtering in the context of optimal filtering in stochastic signal processing during the next 15 years was published in numerous papers and reports.
Adaptive noise cancelling was proposed around 1970 also by Widrow as a radically new and different use of adaptive filters to eliminate interference corrupting a signal where a second ‘pure’ version of the interference was available. The early work on adaptive noise cancelling was summarised and presented to the professional community in a 1975 paper by Widrow et al. “Adaptive Noise Cancelling: Principles and Applications” as a major conceptual innovation beyond the adaptive filter itself, which opened the way to numerous `new applications. In fact this turned out to be a seminal paper that to date has been cited by 2878 scientific papers and 382 patents. https://ieeexplore.ieee.org/document/1451965
Adaptive filters and adaptive noise cancelling have thus been considered notable innovations and concepts in their own right both by Widrow and the professional community et large. However, Adaptive Noise Cancelling is actually the term most likely to be googled by the public as it is now used in the context of noise cancelling headphones in widespread use. Adaptive Filters and Adaptive Noise Cancelling are thus both notable topics in their own right that merit separate Wikipedia articles.
Whilst the analysis and terminology of adaptive filters and algorithms is in terms of stochastic signals, adaptive noise cancelling usually involves interference and signals such as machinery noise or ECGs which are more appropriately treated as time varying deterministic signals. The draft article uses this model and terminology.
The draft refers to the existing Adaptive Filters and Least-mean-squares Filter articles wherever possible but the explanation of the difference between the classical and adaptive noise cancelling configurations necessitates some direct discussion for the above reason.
I suggest that the Adaptive Noise Cancelling draft should be considered on its merits, given the above and existing articles on related topics. John Kaunitz (talk) 01:52, 30 January 2023 (UTC)[reply]
We have tricks called anchors (Template:Anchor) and redirects. The anchor is a bit of hidden code to which you can point a redirect. If you add your material to Adaptive filter and add an anchor, then you can create a redirect called Adaptive Noise Cancelling that will take the reader directly to the section about noise canceling. It serves the reader's needs and improves maintainability. Constant314 (talk) 02:17, 30 January 2023 (UTC)[reply]
Adaptive noise cancelling introduced new terminology(reference) related to this configuration of the adaptive filter which differs from the previous classical treatment. Whilst the previous analysis and terminology of adaptive filters and algorithms is in terms of stochastic signals, adaptive noise cancelling usually involves interference and signals such as machinery noise or ECGs which are more appropriately treated as time varying deterministic signals. The draft article uses this model and terminology.
The draft refers to the existing Adaptive Filters and Least-mean-squares Filter articles wherever possible but the explanation of the difference between the classical and adaptive noise cancelling configurations necessitates some direct discussion for the above reason.
In summary, basic adaptive filtering and adaptive noise cancelling are two notable concepts and topics in their own right that justify separate Wikipedia articles that provide a simple, easily understandable explanation of each.
I trust that the Adaptive Noise Cancelling draft will be considered on its merits, given the above and existing Wikipedia articles on relevant topics. John Kaunitz (talk) 02:25, 30 January 2023 (UTC)[reply]
Notability is important for all material added to Wikipedia, but not so important when it comes to whether it is added to an existing article, or it becomes a separate article. But I have had my say, so let me end with wishing you good luck and happy editing. Constant314 (talk) 02:30, 30 January 2023 (UTC)[reply]
Sure there is overlap with existing articles but this is a valuable contribution. I don't see a good reason to decline it. The organization of coverage in this area could use improvement and adding this article doesn't help with that but this contribution does provide a lot of information not currently available in existing articles. We can improve organization over time. 14:05, 25 March 2023 (UTC)
COI Declaration
kaunitzj (John Kaunitz) is the author or co-author of the following references cited in the article:
"General Purpose Hybrid Adaptive Signal Processor" (1971)
"Adaptive Filtering of Broadband Signals as Applied to Noise Cancelling" (1972) PhD dissertation.
"Noise Subtracting Filter Study" (1973)
John Kaunitz is also one of 9 co-authors of the widely referenced paper "Adaptive Noise Cancelling; Principles and Applications" by Widrow et al. Proceedings of the IEEE (Dec 1975). Kaunitz had minimal active involvement in producing this paper but in parts it relies on his previous work.
Kaunitz has had no subsequent involvement in the field over the past 50 years and has none at present other than the draft of this article. The draft is the result of a survey of currently available sources.
