Talk:Delay encoding

i believe some examples are required !

Modified Miller Code: US patent 4227184

This is a modification to make it DC-free, at the expense of a longer run length. It's explained very well in "The Art of Digitial Audio, p. 365. http://books.google.com/books?id=eVpITJfPxMEC&pg=PA365&lpg=PA365&dq=%22miller+code%22&source=web&ots=vsRAFqo7Fg&sig=FLBW1TE7bGNp0Av763lB2N_szLA&hl=en&sa=X&oi=book_result&resnum=10&ct=result

As per normal MFM, but any time you have an even number of ones between adjacent zeros, the last 1 is suppressed (sent as zero). It's still identifiable as a 1 by the lack of surrounding clock bits. This allows a maximum run length of 5. (If you want better, the zero modulation code has tighter coding bounds.)

71.41.210.146 (talk) 04:33, 31 October 2008 (UTC)

MFM

What's the difference between this and Modified Frequency Modulation that justifies having two separate articles? --Damian Yerrick (talk | stalk) 12:22, 5 July 2012 (UTC)

There is no difference. I've formally proposed the merge. Any preference as to the final name? 71.41.210.146 (talk) 18:50, 10 December 2015 (UTC)

It looks like two different industries (storage and communications) have different names for the same coding. I also seem to recall that there are two patents for the same code. MFM gets about 3 times the Google hits (including Scholarly hits) as "Delay endoding" (no Scholarly hits). That's one way to decide the surviving title. Another way is the name first used should be the article's title with a redirect for the retired name. The Miller code patent from the storage industry is 1960 but it doesn't use the either phrase. I think the storage industry began using the phrase by the late 1960s. Tom94022 (talk) 22:32, 10 December 2015 (UTC)

Thanks. I'm also slightly inclined towards MFM, but it's not a very strong preference. One downside is that the expansion is a bit wordy. 71.41.210.146 (talk) 05:25, 11 December 2015 (UTC)

Consider that FM is a confusing name, because the signals are actually digital, and not analog like FM implies. That's why digital FM or delay code terms should still be used and mentioned when merging the articles. See also comments about the analog nature of FM in the MFM article's talk page.

FM (digital), aka Differential_Manchester_encoding can be confused with Frequency modulation (FM) but at least there is now a pointer from the latter to the former. I am not aware of an analog version of MFM so I don't think there is any possibility of confusion that can't be dealt with if we merge this article with the MFM article. So I suggest we go ahead. Tom94022 (talk) 07:19, 4 June 2017 (UTC)

@Damian Yerrick: @71.41.210.146: @Tom94022: @Matthiaspaul: just looking in here from WP:PM... this is the second-oldest merge proposal still open on Wikipedia! Is it still going ahead? Richard3120 (talk) 18:17, 16 January 2018 (UTC)

Thanks for the reminder. The only impediment is the willingness of someone to do it; my bucket list is pretty full but if I have a moment I will try. If there is anyone else with more time to spare please go ahead. Tom94022 (talk) 22:50, 16 January 2018 (UTC)

I've completed this long-standing proposal in a fairly simple way, maintaining a separate section for Delay encoding, given the argument in the MFM article that MFM is a "modification to the original ...". However, I've also also changed the lede and title of the former coding section, with a few to allow the new section to fit. I won't be at all offended if the MFM page is restructured to make this merge more 'seamless' as there is probably some redundancy now. Klbrain (talk) 12:30, 5 February 2018 (UTC)

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