I have the box in front of me. I'll check it out in a bit. It doesn't look to have enough components to have any logic in it but we'll see. Any such logic would pre-date the front to back logic decoders. No mention of any form of logic is on the box itself. Only 6dB of enhancement should not be that disturbing vis-a-vie audible pumping. I suppose that vocals could shift around a bit, without any rear blend.1st [Sony] SQ decoder(s) with logic circuits.
Kirk Bayne
Only 6dB of enhancement should not be that disturbing vis-a-vie audible pumping.
The way the Sony SQ ad is worded, it seems like the front-back gain riding logic senses CF (and probably CB) content and adjusts the gain to give a net 9dB channel separation (kinda close to what Involve Audio discovered ~40 years later - only 12dB channel separation is needed).
Kirk Bayne
Nothing so sophisticated!The way the Sony SQ ad is worded, it seems like the front-back gain riding logic senses CF (and probably CB) content and adjusts the gain to give a net 9dB channel separation (kinda close to what Involve Audio discovered ~40 years later - only 12dB channel separation is needed).
Kirk Bayne
Nothing so sophisticated!
I couldn’t find the SQD1000 manual but Sony say in that advert that its decoder circuitry is the same as the SQA200 whose manual I have found. It confirms that there is indeed some form of front to back logic. Sony describe it thus-
View attachment 78285
View attachment 78286
So it’s a pretty crude blending of the front or rear channels if a mono (centre) signal is detected in the other pair. Their claim of this circuit ‘making SQ more close to discrete’ seems ludicrous.
Interesting info, indeed. Now then in the case of say a SQ left front signal, that would not produce a sum or difference control signal for blending. Would this put the circuit performance back to simple decoding: 3dB separation front to back?
That ad took me aback with mention of logic. Obviously it was a precursor to actual front-back (gain-riding) logic. I think that F/B logic was actually a step backward, introducing unnatural and unnecessary pumping. With the variable logic or blending they solved the SQ problem of the vocals coming from everywhere at once, or as the critics said nowhere at once. The more common solution was fixed blend, usually 10% front and 40% back. IMHO that (fixed blend) is a case where the cure is worse than the disease! The SQD-1000 keeps the vocals up front like the fixed blend decoders but without the left to right sound stage narrowing!The way the Sony SQ ad is worded, it seems like the front-back gain riding logic senses CF (and probably CB) content and adjusts the gain to give a net 9dB channel separation (kinda close to what Involve Audio discovered ~40 years later - only 12dB channel separation is needed).
Kirk Bayne
I'll give it a try but I'm used to the S&IC which has no problem at all localising Cb.Have you had a chance to try the SQD-1000 on some of the more difficult to decode SQ content (I own very few SQ records and have only heard the SQ decoder in the Pioneer QX-747 on a regular basis [not for about 30 years though])
Maybe try some of the early SQ discs w/CB content (IIRC, the Indian Reservation SQ disc has specific CB content) to see if the SQD-1000 is able to better localize CB?
Kirk Bayne
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