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{{WikiProject Computing|class=C|importance=Low}}▼
{{WikiProject Electronics|class=C|importance=Low}}▼
{{DYK talk|12 July|2022|entry=... that early [[floppy disk]]s used '''[[Frequency modulation encoding|FM encoding]]''' that took up only half the available storage?|nompage=Template:Did you know nominations/Frequency modulation encoding}}
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== Feedback from New Page Review process ==
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I think this article, [[Run-length_limited]] and [[Differential_Manchester_encoding]] say that the frequency modulation encoding is a differential Manchester encoding erroneously. The encodings have the same aim of limiting run-length, but there are obvious differences (presence of the evenly-spaced clock and using sole change of frequency to tell 0 from 1 data bit apart in FME). None of the three articles has an inline citation for such claim and I couldn't locate one in Google/Google Books. [[User:PaulT2022|PaulT2022]] ([[User talk:PaulT2022|talk]]) 07:00, 27 March 2023 (UTC)
:Pinging @[[User:David Eppstein|David Eppstein]], as it appears to have been [https://en.wikipedia.org/w/index.php?title=Frequency_modulation_encoding&diff=prev&oldid=1083452524 added] following the [[Template:Did you know nominations/Frequency modulation encoding]].
:Is there a source for "It is the same code as the one described in differential Manchester encoding"? Am I missing something obvious by seeing them as different encodings? [[User:PaulT2022|PaulT2022]] ([[User talk:PaulT2022|talk]]) 03:49, 28 March 2023 (UTC)
::Our [[frequency modulation encoding]] article describes each data bit as being encoded by two time windows, with a single signal transition possible per window, and with the encoding of the bit determined by whether one or two transitions happen in these two windows. So does our [[differential Manchester encoding]] article. Do you think that one of these two descriptions is incorrect? Which one, and why? —[[User:David Eppstein|David Eppstein]] ([[User talk:David Eppstein|talk]]) 03:55, 28 March 2023 (UTC)
:::You're right! I was confused by wording of the [[Differential Manchester encoding]] article and assumed it refers to differential transmission of regular (biphase-level) Manchester code. The first sentence of its lead is ambiguous and can apply to either.
:::Compare what article says currently with how it's defined in Horowitz and Hill, for example: {{tq|the bit value is encoded as presence or absence of a mid-cell transition, following a mandatory transition at the beginning}}. [[User:PaulT2022|PaulT2022]] ([[User talk:PaulT2022|talk]]) 05:05, 28 March 2023 (UTC)
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