RE: Dead FM Broadcasting Technologies

["Larry Lovering" <larry.lovering@cox.net>]

There were two competing LP quad schemes: SQ was the Columbia version, and
used a helical modulation signal in the left-right walls of the record
groove to reproduce left rear and right rear when a stereo signal was fed
into an SQ decoder and two additional amplification channels.  The other, I
think was called CD-4 and was pioneered by JVC used a special stylus and a
deeper record groove (I'm not making this up) that had the rear channels at
the bottom of the groove and again, through a decoder (some built into the
turntable base, with four RCA line level outputs) and two additional amp
channels.

Some of the stereo quad rigs had a joystick control for balancing the four
speakers.  It was really gimmicky and not very practical.  The only
redeeming feature of a specific quad record was Santana's Abraxis.  The mix
in stereo was very different and one I preferred even over the CD releases.

Interesting site at
http://personal.riverusers.com/~manderso/quaddisc/quadplay.htm describes the
competing quad formats.  There was also a discrete quad format in 8-track
cartridges and reel tape.

-Larry
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> -----Original Message-----
> From: owner-boston-radio-interest@bostonradio.org
> [mailto:owner-boston-radio-interest@bostonradio.org]On Behalf Of A.
> Joseph Ross
> Sent: Friday, November 29, 2002 11:39 PM
> To: Hakim Madjid; Rod O'Connor
> Cc: boston-radio-interest@bostonradio.org
> Subject: Re: Dead FM Broadcasting Technologies
>
>
> On 29 Nov 2002 at 19:20, Rod O'Connor wrote:
>
> > What about the old Matrix-encoded Quadrophonic FM broadcasts?
>
> What about quadrophonic stereo records?  I remember talking about
> the idea with one of my
> law professors, and he figured he'd just bought his two-channel
> stereo and didn't need four
> channels.  I think that's what most people figured.
>
> > Quadrophonic FM Stereo sure didn't last long.
>
> Quad stereo didn't last long in any medium.
>
> --
> A. Joseph Ross, J.D.                           617.367.0468
>  15 Court Square, Suite 210                 lawyer@attorneyross.com
> Boston, MA 02108-2503           	         http://www.attorneyross.com
>
>
>