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Old 17th March 2012, 08:41 PM   #3651
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I wonder if the digital delay was actually in the audio chain? Perhaps it was fed audio to adjust the servo for moving the cutting head, with the acutal cutter head fed seperately. I am not an analogue mastering engineer but perhaps we have a few on the board who would know if this split audio path was the case. Regards
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Old 17th March 2012, 08:46 PM   #3652
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Hi,

Quote:
Originally Posted by john dozier View Post
I wonder if the digital delay was actually in the audio chain?
Not great on cause and effect, are we?

You must delay the audio fed to the cutterhead, so that actua audio (not delayed) can be analysed for level and frequency content and then the groove spacing can be adjusted automatically so that the groves ALREADY have more spacing when the signal at the cutterhead demands higher excursions...

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Old 17th March 2012, 09:03 PM   #3653
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Well Mr. Expert at all things, how about two tapes played with a small offset, one to the servo the other to the cutterhead? Regards
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Old 17th March 2012, 09:05 PM   #3654
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BTW your snide comment was not appreciated. Great with customers I would also surmise.
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Old 17th March 2012, 09:10 PM   #3655
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Hi,

Quote:
Originally Posted by john dozier View Post
Well Mr. Expert at all things, how about two tapes played with a small offset, one to the servo the other to the cutterhead? Regards
This is how it was done BDD (before digital delays), actually one tape but two heads. You needed a fair bit of tape between the two heads though (several seconds worth, which 15ips gets long quick). This is a fairly non-trivial affair and the works often jammed up (or so I was told).

The best solution is still a human who can read sheet music and follow along making manual adjustments. Stan Ricker still cut's in "fully manual" mode, or so I am told.

The automated systems introduced by Neumann are a bit like the compressors everyone seems to insist upon putting on the final mix (instead of gain-riding the mix to domestically usable dynamics). It means fairly unskilled people can operate the system and get decent results, but there always is a price to pay...

Ciao T
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Old 17th March 2012, 09:24 PM   #3656
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Stan Ricker still cut's in "fully manual" mode, or so I am told.
Ciao T
Lots of great work, I don't think these folks get enough credit.
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Old 17th March 2012, 09:35 PM   #3657
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The best way is to use two tape heads and a loop delay. This way there is NO digital interface, and a true delay. I designed the electronics for one for Mobile Fidelity, over 30 years ago.
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Old 17th March 2012, 09:42 PM   #3658
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Will do. I had thought about that but my first attempts I was fooling myself by not looking at the right place. I also found a plug in to LTSpice that plots distortion across frequency. Easier than three of four separate plots. Still need to pick several levels.

I figure if I concentrate on such a "small" part while I get a better understanding of transistors, it will help much more further on. Spice has a lot of capabilities not obvious to an amateur and it just scratches the surface of reality. Lack of models and their completeness is one problem. I bet LT has a much better set that applies to on-chip parts with a lot more precision.

Got to do something waiting on my parts to complete a passive crossover, with BSC.
Oh, the comment about doo-doo. That is for those who build speakers out of perfect spreadsheet and web "design your crossover here" sites. Many do and and find out that is not all there is to it. For instance, the wider a baffle, the less deep I tend to make the BSC, not just the frequency. The pair I am doing right now is only 6 inches wide, and it took a lot of tries to get it happy. This particular design had a fixed aesthetic requirement so I could not play with the width and crossover points to achieve the same thing without the extra parts.
I am sure we agree, a studio monitor has a different job to do than my main listening speakers. The environment is different, solution will be different.
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Old 17th March 2012, 10:13 PM   #3659
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Quote:
Originally Posted by john curl View Post
The best way is to use two tape heads and a loop delay. This way there is NO digital interface, and a true delay. I designed the electronics for one for Mobile Fidelity, over 30 years ago.
The best way is to use digital delay once, recording resulting sidechain, then apply this sidechain to direct actual recording without any delays. Just 2-step procedure: adjust well then shoot once.
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Old 17th March 2012, 10:16 PM   #3660
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Good approach, Wavebourn.
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