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- Newsgroups: rec.audio
- Path: sparky!uunet!peora!tarpit!bilver!bill
- From: bill@bilver.uucp (Bill Vermillion)
- Subject: Re: Help!
- Organization: W. J. Vermillion - Winter Park, FL
- Date: Thu, 19 Nov 1992 23:08:11 GMT
- Message-ID: <1992Nov19.230811.20378@bilver.uucp>
- References: <1992Nov14.202759.15031@sol.ctr.columbia.edu> <1992Nov18.185115.17816@tellab5.tellabs.com>
- Lines: 91
-
- In article <1992Nov18.185115.17816@tellab5.tellabs.com> chrz@tellabs.com (Peter Chrzanowski) writes:
-
- >BTW, stereo records were first manufactured in 1957.
- >
- >BBTW, in 1974 or thereabouts they made four-channel records. They
- >had an ultrasonic carrier on the left and right channels (similar
- >but not identical to stereo FM) which contained (front minus back)
- >information. To hear all four channels you had to have a special
- >cartridge, a decoder box, and four channels of amplification.
-
- What you describe above is the RCA/JVC CD-4 technology. It was
- one of 6 methods used to try to bring >>!!! QUADRAPHONIC !!!<<
- to the mass consumer market.
-
- The first home quad attempt was on 1/4" tape with pre-recorded
- tapes released by Vanguard, and the first quad tape machine
- from Crown.
-
- This inspired the record companies to try to develop QAUD for
- the home.
-
- There was (as mentioned above) the RCA/JVC CD-4 system.
-
- There were two phase encoded systems the SQ - from CBS and
- friends and the QS from Sansui and friends. (I may have
- swapped those two designations). These were pretty shaky at
- startup and offered thrilling (I used that word sarcastically)
- separation of from 3 to 6db per channel.
-
- This really was just a small step above the first "Dynaco" quad
- which really just put an extra speaker between the hot leads of
- a stereo amp. The Beach Boys produced the first commercial
- album designed to use the Dynaco method. I want to say it was
- "Smiley Smile" - but I don't think so. It was on their new
- label that had and Indian on horseback.
-
- After working on the phase encoded devices they got pretty
- decent at the end. Just when the consumer had given up trying
- to figure out 3 competitive commercial format.
- Tate came out with an IC that did a very good job.
- But it was too little - too late.
-
- Oh - you say I forgot the 5th format. Well, it was a quad
- cassette. Philips was quite farsighted in the original compact
- cassette design. By keeping the tracks in the same relative
- position - not interleaved as in reel-reel stereo, Philips quad
- entry was compatible. Quad played on stereo and played on
- mono.
-
- They just made the tracks narrower so that 4 audio track (8
- across the width of the tape) fit where 2 stereo and one mono
- did.
-
- The left-front and left-rear tracks were played by the left
- head in a stereo system.
-
- I don't know if this ever made it to the marketplace, but it
- existed in protype form. Philips also had one of the first
- digital reel to reel systems. Quarter-inch tape, 7.5 ips, and
- stereo. Each audio track used 7 digital tracks in parallel -
- so in essence they had a 1/4 head that laid down 14 tracks.
-
- I do not remember if this was a reversible tape - or whether it
- played in one direction only. I heard the talk on this at an
- AES convetion about 12-15 years ago.
-
- But all was not lost. This wonderful "quad" technology is
- enjoying a boom - and it doens't look like it's going to stop.
-
- Of course no one could sell 'quad' after the above debacle, so
- the phase encoded quad system was renamed to live on in all
- it's glory as "Dolby Stereo".
-
- >Amazing what can be done with primitive technology.
-
- Sometimes the ideas are there but the existing technology isn't
- up to fulfilling the dreams.
-
- After all video disc players are just coming into their own now
- - 1992. That's only 64 years after the first video disk.
-
- And here's another piece of trivia. The first television - eg
- visual signals transmitted by electiral means - although quite
- crude - was invented many years before A.G. Bell came up with
- the telephone.
-
- --
- Bill Vermillion - bill@bilver.oau.org bill.vermillion@oau.org
- - bill@bilver.uucp
- - ..!{peora|tous|tarpit}!bilver!bill
-
-