Talk:Quadraphonic
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142.177.127.64: It seems that the webpage link you posted refers to quad LPs as a "fraud" if they are not discrete. I agree with the site that matrix quadraphonic is not an accurate representation of the original multichannel content, but I disagree that a matrix reproduction should be labelled "fraud". TMC1221 00:57, Feb 25, 2004 (UTC)
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[edit] This word does not make sense!
I can tell by the 2 elements attatched together that this word does not make sense. "-phonic" is a Greek suffix as I can tell because it has a ph instead of an f, which means it comes from the Greek letter phi. However, quadra- is the Latin numerical prefix for 4; the Greek equivalent is tetra-. Who was the first person to coin this word?? Any comments about it?? 66.245.99.97 21:47, 4 Oct 2004 (UTC)
- Compare to homosexual and, I presume, many other words. Hyacinth 00:26, 5 Oct 2004 (UTC)
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- The word was coined back in the 1970s. Bit late to change it now. Martin.leese 05:17, 7 January 2007 (UTC)
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- Hafler, Scheiber and CBS used "Quadraphonic." Other words were "Quadrasonic", used by Cooper and Shiga, and "Surround sound" by Michael Gerzon. Also found, "Quadriphonic", "Quadrophonic", and "Tetrasound". Much of this was centered on trademark issues. Martinwill2 07:47, 1 February 2007 (UTC)
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[edit] Wendy Carlos on Quadraphonic
Wendy Carlos (a.k.a. Walter Carlos) of "Switched-On Bach" fame has a very interesting web site on Quadraphonic and surround sound, with lots of history. See http://www.wendycarlos.com/gosurround.html
- Wendy (formerly Walter) is well respected in the audio community. I have therefore added her to the "External links" section. Martin.leese 05:33, 7 January 2007 (UTC)
[edit] Quadraphonic is not a fraud
I deleted the article "Quadraphonic LPs a fraud," because the article itself is merely a fraud. It claims that Quad records were merely Stereo albums specially promoted to get listeners to buy more expensive equipment. This is simply untrue. This article is an insult to the many mixers who worked on the Quadraphonic records of the 1970s, creating the true surround mixes. (Ibaranoff24 17:50, 29 November 2005 (UTC))
[edit] Market analysis would be nice
A request for the experts: I think the article would benefit greatly from an analysis of the market. How many of the main stereo manufacturers made quadraphonic equipment, and of what type? What were the sales like? Who was buying quadraphonic equipment, and why weren't the rest of the populace? How many artists came out with quadraphonic albums? Which countries was it better promoted in? As a notorious failure (at market) of a new technology, this sort of analysis would be extremely interesting. Tempshill 21:22, 6 December 2005 (UTC)
[edit] Ok, so how Does it Actually Work
This article discusses various versions of quadraphonic sound and their differences, but it never talks about how the needle physically reads all 4 channels.
- Well, the various systems are collected into two sets. The first is Quadraphonic#Discrete:, where the systems that use a needle state how the extra channels are super-sonic. The second is Quadraphonic#Matrix:, where the systems describe how the extra channels are encoded into the two main channels. What part of this wasn't clear from the article? Martin.leese 08:22, 10 January 2007 (UTC)
[edit] Deletion of UHJ / B-format section
I removed the UHJ/B-format section altogether because UHJ and B-format are components of Ambisonics, and Ambisonics is unconnected with quad. I did add a link to the Ambisonics article in the "See also" section.
The reference for this is the Ambisonic Surround Sound FAQ. As I created and maintain this, I will explain a little more. With Ambisonics it is possible to decode three-channel B-format to any number of speakers. The minimum number of speakers for this first-order, horizontal Ambisonics is four, but the resultant soundfield tends to be on the limits of stability. Six speakers is much more stable. You can add additional channels to the B-format to give full-sphere, for which you need at least six speakers. See, nothing really in there to do with quad. Martin.leese 05:07, 7 January 2007 (UTC)
For reference, here is the section I deleted:
====UHJ / B-format====
In Ambisonics B-format, known as first-order Ambisonics, sound information is encoded into 4 channels: W (pressure signal), X (front-back information), Y (left-right information) and Z (up-down). Ambisonics UHJ coding can be used to produce stereo compatible Ambisonic records, tapes and broadcasts.
The X, Y and W signals are matrixed into two channels using the following transform:
| Encoding Matrix | W (pressure signal) | X (front-back information) | Y (left-right information) |
|---|---|---|---|
| Left Total | 0.470 + k0.171 | 0.093 + j0.255 | +0.328 |
| Right Total | 0.470 + j0.171 | 0.093 + k0.255 | -0.328 |
j = + 90º phase-shift , k = - 90º phase-shift
[edit] Addition of External link to Hafler circuit
I want to add an External link to my Web page which shows the circuit for a Hafler circuit. The Hafler circuit is described in the Quadraphonic#Hafler circuit section. As this would be a link to my Web page, for me to add it without discussing it here first would be a potential conflict of interest. Martin.leese 01:17, 9 January 2007 (UTC)
- Nobody objected so done. Martin.leese 06:58, 20 January 2007 (UTC)
[edit] Matrix H
Updated detail with reference to original announcements in Wireless World, and showing the path that led to Ambisonic UHJ. Paul Hodges 11:44, 30 January 2007 (UTC)
