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Compression ratio - Optimod

whit979

whit979

Can anybody tell me what the AGC ratio is set to on Orban's older digital processors (like the 8100 and 8200)?
 
whitfm said:
Can anybody tell me what the AGC ratio is set to on Orban's older digital processors (like the 8100 and 8200)?
Click to expand...

Don't know about 8200, but the 8100 has a fairly high ratio of around 12:1 that gets tighter with more gain reduction...


Regards,
Goran Tomas
 
One more question. What are typical AGC ratios on Omnia presets (like the ones designed for Adult Contemp. formats)? Help!! :)
 
I didn't measure Omnia AGC ratios, but IIRC some comments they like to use 4:1 compression ratio...


Regards,
Goran Tomas
 
whitfm said:
Can anybody tell me what the AGC ratio is set to on Orban's older digital processors (like the 8100 and 8200)?
Click to expand...

The AGC ratio is very high on these older Optimods, approaching infinity:1. This depended on the setting of the AGC release time control; ratios decreased somewhat as the release was speeded up, although never below about 10:1.

When we designed the 8400, one added feature was an AGC compression ratio control to preserve a some long-term dynamic range at the user's discretion. The ability to use lower compression ratios was aimed mainly at classical formats.

Moving forward, in the 6300 we added compression ratio controls to each of the bands in the 2-band and 5-band limiters in addition to the compression ratio control in the AGC. One of the intended applications of the 6300 is mastering, where these controls are needed.

Bob Orban
 
Bob,
Could you please tell me if there is any difference between the 8200's dual band agc between v1.2 and v3?
The reason i ask is that i have been told several times that the v1.2 has a better agc than v3.
Could you please advise if the agc is different and what is the difference?

Thanks,
Paul.
 
BROADCAST said:
Bob,
Could you please tell me if there is any difference between the 8200's dual band agc between v1.2 and v3?
The reason i ask is that i have been told several times that the v1.2 has a better agc than v3.
Could you please advise if the agc is different and what is the difference?

Thanks,
Paul.
Click to expand...

As far as I can remember, there was no change made to the 8200's AGC between 1.2 and 3.0. It was always 2-band with no window gating, a slow attack, and a high compression ratio. But I'm not 100% certain. When one has developed as much processing as I have, it's hard to remember the exact details of something I worked on over 10 years ago :)

The first major change that we made to the AGC was when we introduced window gating in the 8400. The new AGC we are now phasing in to many of our products represents a further change, with improvements in the level detection, band coupling, and window gating algorithms. (Upgrades incorporating this new AGC have already been released for the 5300, 6300, 8300, and 8500. The 9400 upgrade willl be available soon. The 9300 has had the new AGC from the beginning. Upgrades are downlodable from the links at www.orban.com.)
 
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