Talk:Four-channel Compact Disc Digital Audio

message: I've left a citation from Apple's Developer Connection documentation (in addition to the Cdrdao project and Compact Disc parent article references), so hopefully we can agree that this feature exists now.  On to more interesting research...  In several places on the net (e.g. in recording enthusiast discussion groups, programmer forums, etc.) I see it said that "very few" CDs have been released with four channel audio.  (Not surprising, since consumers have rejected quite a few multichannel audio-without-video standards over the decades.)  Anyways, I've added a wiki to-do to determine what these "very few" CDs actually are, or if in fact there have been none. --Ds13 18:17, 2005 May 26 (UTC)
:Anyone aware of commercially released four channel CDs?  I read rumors here and there of old quad recordings having been re-released on CD, but I can't find any definitive catalog entries.
:Here's one such rumor...  Four of Harry Nilsson's albums were originally recorded and mixed for quadraphonic sound; someone close to Harry has remastered the quad mixes into four-channel CDs that decode very nicely on a home theater surround system. Sorry,they're not commercially available, and probably never will be, and that's a shame, because in surround sound, these albums are incredible. I was given my copies as a gift by someone who knew how big a Harryhead I am; http://www.gerrold.com/soup/2003_12_28_archive.htm  --Ds13 19:43, 2005 May 24 (UTC)
:Can you also provide proof of a Home Sound System ever produced that is capable of decoding these so  called 4 channel CDs? (as these are distinctly different to Dobly Surround and DTS encoding methods. --User:203.4.129.6
::Nope, I'm not aware of any. Supporting this would seem to require adding external jacks and internal circuitry to CD players (read: spend money) and since consumers of the era had just finished rejecting several quadraphonic audio standards, manufacturers (& publishers) really wouldn't have a strong reason to get behind this (read: spend money).  I believe similar reasons apply to CD+G decoders and outputs — something you rarely find on CD players, despite it being an interesting idea. --Ds13 07:16, 2005 Jun 15 (UTC)
:::According to the web page The Vingage Knob TVK there was a Pioneer model back in 1981, the model 1516, which supported quad output. Check the Pioneer #1516 under the section TVKº11 Invisibilia. In some place I read that it used 32 kHz sampling frequency rather than the (stereo) CD standard of 44,1 KHz; the bits/sample figure was 12 or 14 rather than 16. But I don't keep the source I read this info from so you can happily remove this last comment or file it as "another urband legend". Well, OK, I'll check it thoughtfully later on. --88.29.17.61 (talk) 12:48, 7 March 2009 (UTC)
thread_title:  Released CDs? 

message: I checked three versions of the official Red Book (all in paper version, so no 'searching' possible). The June 1980, the Sept. 1983, and the Nov. 1991 issue give the same remark on page 1, "Main parameters", namely -Number of channels: 2 and/or 4 simultaneously* sampled. In the footnote: *In the case of more than two channels the encoder and decoderdiagram has to be adapted. (I literally copied the Dutch/Japanese version of the English language). That is all that I could find in the above three official texts. I do not understand at all what the CD founding fathers meant with the term 2 and/or 4 simultaneously sampled, but that is a different story. Also I could not find any 'adaption' of the encoder and decoder diagram or subcode channel assignment. So in conclusion: the Red book mentions the possibility of a 4-channel version, but it has never been implemented. Also I have never seen or heard of any later implementation. Dsc 14:11, 27 July 2005 (UTC)
replies: text: Thank you Dsc. This is what I've been "stubbornly" saying. Perhaps Ds13 will finally be convinced? Mirror Vax 17:28, 27 July 2005 (UTC)
thread_title:  Getting closure on factual nature of the article? 

message: After much searching I found this discussion about 4channel CDs which says that Craig Chaquico's "Shadow and Light" has on 4-channel encoded track, the last track ("Café Carnival").   Samboy (talk) 00:42, 12 June 2009 (UTC)
replies: text: The "References" tag at the top is incorrect because this article does reference versions of the "red book"; I just have to figure out how to make a proper reference to the Red Book and then remove the "References" tag at the top. Samboy (talk) 15:10, 12 June 2009 (UTC)
thread_title:  References 

message: I think this page should be merged in Red Book (CD standard)  — Preceding unsigned comment added by 93.56.118.181 (talk) 19:38, 3 September 2011 (UTC)
thread_title:  Merge article 

message: For 4 channel audio it has to be 22/16 instead of 44.1/16. There is no standard software I know of to create these. This is what worked for my tests on many players, but since the Redbook never specified this it is hard to say if it would work on all players. I have never read any documention that actually specified this, actually found it on some forum and tried it and it worked.
I created a 4 channel .wav at 22/16 and then a cue sheet w/ the 4 ch flag set and used CDRWIN to write it (Nero and others will convert it to 44.1 so only CDRWIN worked). Another tricj was to write it as binary instead of audio as CDRWIN didn't like audio - but as I said it works.  — Preceding unsigned comment added by Tyros1972 (talk • contribs) 19:52, 26 December 2011 (UTC)
thread_title:  How to create a working 4 ch CDDA