Talk:Matrix decoder

message: does matrix decoding involve utilizing 2 stereo channels being "mirrored" and separating offsets on the other channels? (unsigned comment from anon) —Preceding unsigned comment added by 69.209.157.150 (talk) 13:41, 4 Febuary 2006 (UTC)
:No.  For example, UHJ decoding produces W, X, Y channels from Left, Right. Martin.leese 22:33, 6 January 2007 (UTC)
thread_title:  Question 

message: The two pages are complementary in that one should describe encoding and the other decoding. (Although that doesn't seem to be the way they have been written.) I don't have strong views on merging, but feel strongly that the merged article, if there be one, should retain the "2:4" notation used in Matrix decoder.  Martin.leese 07:52, 7 January 2007 (UTC)
replies: text: I am of the opinion that there should be two pages, namely 'audio matrix decoding' (not 'decoder') and 'audio matrix encoding', each of which should have proper links to the other. References to applications for the technology (such as sound recording) should appear on the page(s). Note that pages already exist for encoder and decoder. Novatek 19:56, 20 March 2007 (UTC)
replies: text: HairyWombat, you undid my addition of SQ Matrix Encoding, which, in hindsight, I agree with - we should either split the topics out into matrix encoding and decoding or just do a general 'surround matrixing' topic with separate sections on the complete encoding/decoding equations for individual systems. Ty Chamberlain (talk) 13:31, 18 May 2009 (UTC)

text: Ah, OK, gotcha - thanks for telling me "why" - I'll remember that in the future.  I'm working on, but haven't posted yet, an in-depth article on Lynn Olson's (never produced) advanced Shadow Vector SQ Decoder, so I'll start working on SQ too so it can be a really complete source of info on the SQ system -encoding/decoding/history/development, etc... - there is SO MUCH incorrect info on the net about SQ (and quad/surround history in general) - some of it from people who were 'there' at the time and should know better.  BTW, HairyWombat, how much do you know about quad/surround history and formats? I ask because your additions/deletions about the Ghent microphone made me dig deeper and (initially thinking you were wrong) I found that you were 100% correct - development of the SoundField and Ghent is quite "obscure" really, from a standard quadraphiles knowledge, so I've been really impressed.  —Preceding unsigned comment added by Disclord (talk • contribs) 17:24, 18 May 2009 (UTC)

text: I guess I had a 'brain fart' yesterday because I thought I did sign my 'talk' contribution using the four tildes - of course, I was up all night before that with flu, so it probably affected my memory...  I have a truly beautiful sounding Ambisonic G-Format DTS CD (a Jeff Silberman Soundfield recording done for DTS in 1996), but for the life of me, I've never understood the attraction of the 2-channel UHJ "BHJ" format - in either undecoded 2 channel or fully decoded playback, I find UHJ to be completely unlistenable - to me, decoded UHJ is as bad as non-logic SQ in terms of phasiness and lack of localization - and the CF phase error makes it even worse than non-logic SQ.  This is all completely personal opinion, of course, but I'm very familiar with all the psychoacoustic advantages of the Ambisonic 2-channel format (and have read the various Gerzon, Sommerwerck, Leese, Fellget - and others - Ambisonic UHJ papers) but I've never found the 2-channel format to 'work' in real-life - now, in the 'discrete' B-Format/G-Format, Ambisonics works very well and is stunning - but UHJ, forget it. Please don't take that as an attack on you - UHJ advocates can be very rabid in their defense of the format.  I wish some company had produced a variable-preference UHJ decoder - I believe the BBC strongly advocated for their use, but none of the UHJ patent owners ever bothered to produce one. I apologize for asking about your quad knowledge - I didn't realize who you were until you mentioned the Ambisonic FAQ, which I've read many, many times.  Where in the world does the name "HairyWombat" come from?  "Disclord" comes from the name of a VHD Video Disc player I got from Japan - the VHD format was never released in the USA and Panasonic called their VHD players "Disclord" - JVC called theirs "DiscWorld." Maybe I should have kept my 'old' AOL screen name of "Stereoboy" for Wikipedia?  They (Wikipedia) need to add a user preference to automatically sign all "talk" contributions. Ty Chamberlain (talk) 14:39, 19 May 2009 (UTC)
thread_title:  Merging with [[Matrix (sound recording)]] 

message: Is Discretedored even a word? I did a google search and the only page it returns is this wiki entry, not even one other suggestion. Possible mistype of some form of audio encoding or strange vandalism?  —Preceding unsigned comment added by 69.241.82.132 (talk) 09:19, 4 January 2008 (UTC)
thread_title:  See also Discretedored?  

message: The Dolby Surround matrix and the Dolby Pro Logic matrix should be the same. I don't recall which of the two presented is the correct one, and so cannot fix the article. But they should definately be the same matrix; one of them is definately wrong. HairyWombat (talk) 13:50, 17 April 2009 (UTC)
replies: text: I think the second set of equations is correct (i.e. sqrt(1/2)).  Dolby Laboratories received US Patent 5,291,557 (http://www.google.com/patents?vid=USPAT5291557), which has this equation in claim 6.  —Preceding unsigned comment added by Beavioso (talk • contribs) 23:05, 12 May 2009 (UTC)
thread_title:  Dolby Surround and Pro Logic should be the same 

message: This article is titled Matrix DEcoder, and yet it contains little except the ENcoding matricies for the various schemes. Surely it should contain the DEcoding matricies. I have no desire to correct this; if I had my way the whole article would be deleted as it contains only information better expressed elsewhere, and I do not see what purpose it serves. HairyWombat (talk) 19:23, 20 April 2009 (UTC)
thread_title:  Why ENcoding matricies in Matrix DEcoder? 

message: There should be an article on Wikipedia on advanced matrix surround decoding, such as Variable De-matrixing (Sansui QS Vario-Matrix, SQ Shadow Vector), Matrix Multiplication/Vector Cancellation (Tate DES for SQ, CBS Paramatrix for SQ, Scheiber-Sonics 360 Spatial Decoder for SQ, Dolby Pro-Logic & PL-II), Gain-Riding Logic (CBS SQ Full-Wavematching Logic, Circle Surround, Peter Scheiber's 1970's quad patents), plus the various methods of detecting channel dominance and directionality, (such as Axis-Crossings, wavematching, envelope comparison, etc...) I've been talking with Lynn Olson, the inventor of the Shadow Vector Signal Analysis Unit for SQ decoding (US Patent #4,018,992) and while it never reached the market because Audionics set its development aside to work on the Tate DES, I think Wikipedia would be the perfect place for info on it and other advanced forms of matrix surround decoding.  Hopefully, we could get the inventors such as Lynn Olson or Martin Willcocks (inventor of the Tate DES) to add info.  Or Jim Fosgate, since he's the inventor of Dolby Pro-Logic II as well as the designer of the vast majority of award winning matrix decoders, such as the legendary Fosgate 101A Tate II Surround Stereo SQ Decoder - it was also the first advanced cancellation decoder to incorporate a high-separation Cinema mode for Dolby Stereo encoded films. (Dolby theater decoders at the time were based on the Tate II DES chip that the 101A used)  Ty Chamberlain (talk) 19:37, 17 May 2009 (UTC)
thread_title:  Should be an article on advanced decoding 

message: This section is in the History for this Talk page, but seems to have vanished into the ether. I have therefore extracted and recreated it. HairyWombat (talk)
HairyWombat, I'm glad to have the lack of a hyphen in Pro Logic cleared up - I've always either used a hyphen or an asterisk since the 'official' logo uses a "dot" between Pro and Logic. Dolby seems never to have addressed this on their site or in my conversations with Roger Dressler of Dolby, so knowing they told you that it's just "Pro Logic" finally gives the subject 'closure' for me since I like to be precise with stuff like that. --~~~~ —Preceding unsigned comment added by Disclord (talk • contribs) 14:45, 19 May 2009 (UTC)
replies: text: The person who told me "no hyphen" was Lily Cheung, Dolby's Intellectual Property Manager. This would have been back in 1995. She also told me that is was "Pro Logic" and not "Dolby Pro Logic". Looking on Dolby's website, they seem to have changed this. I didn't see "Pro.Logic" (with a dot), but it is a big site. The only version Dolby have trademarked in the US is "Pro Logic" so I suggest you go with that. According to their website "Dolby Pro Logic" is a trademark, but this is incorrect. HairyWombat (talk) 19:25, 19 May 2009 (UTC)
thread_title:  Pro-Logic VS Pro*Logic VS Pro Logic 

message: I thought the gameplan was to carve out the SQ section into an article of its own (titled Stereo quadraphonic), and to then delete this article. This was because all the information in it will then be replicated elsewhere (which is almost the case now). If this is the plan then adding more content to this article is futile. HairyWombat (talk) 19:15, 25 May 2009 (UTC)
replies: text: It is, I was just adding bits of relevant info for the interim until I had it 'together' enough to start the SQ section - we could do that now, but what I have so far isn't complete... I figured all of the info here would be 'pulled over' to the SQ article when it was ready and then this deleted.  I don't know how to start a totally new topic, so if you would create it, I'll go ahead and put what I do have ready now.  I'm currently in contact with Martin Willcocks, inventor of the Tate DES for SQ, and he wants to help out so we should be able to get the SQ topic into a reference-quality topic.  —Preceding unsigned comment added by Disclord (talk • contribs) 12:57, 26 May 2009 (UTC)
thread_title:  Article to be deleted 

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