Talk:Adaptive differential pulse-code modulation

	Telecommunication portal This article is within the scope of WikiProject Telecommunications, a collaborative effort to improve the coverage of Telecommunications on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.TelecommunicationsWikipedia:WikiProject TelecommunicationsTemplate:WikiProject TelecommunicationsTelecommunications
Start	This article has been rated as Start-class on Wikipedia's content assessment scale.
???	This article has not yet received a rating on the project's importance scale.

All wrong?

Subband coding is not the same as ADPCM. Is there any source that supports the content of this article? Or should I just flush it and put the scheme that James L. Flanagan invented? Dicklyon (talk) 18:15, 20 December 2008 (UTC)[reply]

I think it's closer to a real article now. I havne't found good support for my recollection that Flanagan invented it, but I think it's out there... Dicklyon (talk) 02:07, 21 December 2008 (UTC)[reply]

This article is absolutely useless.

Where's the details?! there's nothing that actually matters in this article at all. — Preceding unsigned comment added by Bumblebritches57 (talk • contribs) 23:57, 15 September 2014 (UTC)[reply]

At least one editor looks forward to your Bumblebritches57 improvementsSovalValtos (talk) 15:57, 25 September 2014 (UTC)[reply]

SovalValtos, there are established authorities who could contribute to Wikipedia, but they won't. You know why? It's because Wikipedia has no peer review and allow anyone to make changes willy-nilly. Oh, sure, someone who's willing to bird-dog the subject can review the changes and revert, in part or in toto, but that's exactly what the established authorities don't want to be obliged to do. --MarkFilipak (talk) 01:41, 19 April 2015 (UTC)[reply]

This article is a joke

Why is this so damn short? It actually contains following information: - ADPCM is DPCM with a variable scale factor (yes, this is right) - ADPCM was developed in 1970... (might be correct... I don't know) - It is used in telephony instead of mLaw/ALaw to double the capacity of a phone line - There is a Subband ADPCM that uses two subbands

I'm so lucky that I already know, what ADPCM is. I switched to the english version because the german one doesn't look much better so far. Did the mankind already forget, what ADPCM is/was/will be?

- Where is the basic explaination how it works? A non-technician will not understand somewhat. That explaination don't need to be in-dept at developer/code level. - Where are the famous and frequently used IMA-ADPCM and MS-ADPCM? Never mentioned somewhere inside this article - Where is it used? (Telephony isn't the only purpose. It is used in many old computer games and many well-known gaming consoles, voice recorders, old cell phones, some cameras, anti-shock-buffers in portable CD players and some ancient digital storage media including CD-I) - There are some another ADPCM-based G.XXX-Standards not mentioned here. Franky666 — Preceding unsigned comment added by 2003:58:EC37:EF22:FD3B:9CB3:E5EE:297A (talk) 00:29, 30 November 2016 (UTC)[reply]

How it works?

How ADPCM works? How are 8–bit u–law samples mapped to 4–bit? What does each of the 16 4–bit values mean? 24691358r (talk) 18:32, 11 August 2017 (UTC)

This is so frustrating that it is unknown how ADPCM works. My wildguess is that it takes the difference between the last and the beforelast samples, and reapplies the difference between the last and the current sample, and stores -8÷32768, ... 0, 1÷32768, 2÷32768, 3÷32768, 4÷32768, 5÷32768, ... 7÷32768 in a signed nibble. Please tell me it's ADPCM! 27.125.43.78 (talk) 19:10, 13 May 2018 (UTC)