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Robert Orban November 11th 04 04:49 AM
In article , says...



"R. Mark Clayton" wrote in message
...

Like [the UK] had quadriphonic radio broadcasts in the seventies.

And that's someting to be proud of?
Did you ever listen to them?

You are misquoting Mr. McDonald, I do believe. The _US_ had
a quadraphonic broadcasting system approved in the 1970s after an FCC
rulemaking procedure that depended on third-party test results of the
various contenders' systems. IIRC, there were four contenders, including
Dorren and Nippon Columbia (I forget who the other two were, although
one may have been CBS Laboratories).

These were not matrix (like SQ and QS) systems -- they were entirely
discrete, using a second subchannel (at 76 kHz, phase-locked to the 19
kHz pilot tone) with two carriers in quadrature to support the two extra
audio channels. The main difference between the systems was how stereo
and mono compatibility were handled, which depended on the encoding
equations maping the audio channels to the four discrete physical
channels in the FM baseband. The Nippon Columbia system used Duane
Cooper's system of heirarchical directional coding (described by Dr.
Cooper in a number of AES Journal papers at the time), while the Dorren
system was simpler, encoding the two rear channels on the extra
subcarrier.

The FCC finally chose the Dorren system, but, by then, the quad fad has
passed and nothing ever came of the system commercially. But it sounded
just fine, thank you.

Aztech November 13th 04 05:03 PM
"Robert Orban" wrote in message
...
In article , says...

The FCC finally chose the Dorren system, but, by then, the quad fad has
passed and nothing ever came of the system commercially. But it sounded
just fine, thank you.

Given the way most US broadcasters (and now everyone else) like to misuse
certain equipment *cough*, it's apparent quality isn't exactly their primary
concern.

However, Bayern Radio and Swedish Radio send out very nice DD5.1 streams via
DVB-s, and also a 1.5Mbps DTS stream in the latter case, which is all very nice.


Az.

Robert Orban November 17th 04 04:20 AM
In article ,
bloviated...


"Robert Orban" wrote in message
...
In article , says...

The FCC finally chose the Dorren system, but, by then, the quad fad has
passed and nothing ever came of the system commercially. But it sounded
just fine, thank you.

Given the way most US broadcasters (and now everyone else) like to misuse
certain equipment *cough*, it's apparent quality isn't exactly their primary
concern.

In fact, the transparency of the quadraphonic channel was PRECISELY the FCC's
concern during the rulemaking.


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