There is an article in there about a ban on an 8-track cart duplication machine and drug-use related song lyrics, kind of humorous from today's perspective.[Billboard
^^^
"We feel that any sort of compromise would degenerate the SQ system" (Ben Bauer)
The Electro Voice Universal Matrix was available by this time, but isn't mentioned in this article.
Kirk Bayne
Many of the problems were solved (or reduced) but not all of them. The limited frequency response (< 15Khz) for one could never be "solved" without a major redesign of the system.Interestingly, in 1973, CBS bought a JVC Mark 2 1/2 speed CD-4 mastering system and several WEA group titles were mastered by CBS (sometimes one side at CBS and the other side at the JVC Cutting Center).
I don't recall any statements by Mr. Bauer about CD-4 after the problems were solved [in ~1975] (playing time same as stereo/mono LPs, cutting level same as stereo/mono LPs, the 2 big issues early in the [USA] CD-4 timeline).
Kirk Bayne
https://www.discogs.com/release/1981340-Harry-Belafonte-Calypso/image/SW1hZ2U6ODM3ODE1Ng==^^^
A 1965 LP my parents had: "IMPORTANT! RCA Victor's...stereophonic...must be played on phonographs equipped for stereophonic reproduction"
I haven't researched this issue of stereo LPs played on mono record players, but this is similar to requiring a CD-4 phono cartridge, clean CD-4 records and stylus (and correct demod setup).
My point is is that transitioning from mono LPs to stereo LPs required additional procedures as did/does the transition from stereo LP to discrete quad LP.
Sansui did specify a "mono broadcast" mode for QS encoded content, a 90 degree phase shift between Lt and Rt (I haven't worked thru the QS encoding equations to see if Lt or Rt is given the 90 degree shift).
Kirk Bayne
Their (broadcast) solution was to phase shift the right channel by 90°, I bet that sounded good in stereo! Reminds me of CGS. Matrix H and UHJ did basically the same thing. SQ via a forward oriented encoder would be better. Even regular SQ would be better for mono compatibility as the Cb position was rarely used anyway. I think the worry about mono compatibility was overblown anyway!Yes, CB is part of the QS downmix for mono. All directions have equal levels.
I think the worry about mono compatibility was overblown anyway!
Their (broadcast) solution was to phase shift the right channel by 90°, I bet that sounded good in stereo! Reminds me of CGS. Matrix H and UHJ did basically the same thing. SQ via a forward oriented encoder would be better. Even regular SQ would be better for mono compatibility as the Cb position was rarely used anyway. I think the worry about mono compatibility was overblown anyway!
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