Briefly, DRC sends gain control sidechain information that can cause the
receiver (at the listener's option) to dynamically compress the signal. If
the compression is not applied, the listener hears the original signal with
full dynamic range.

The bandwidth of the gain control sidechain information is fairly low,
limiting the compression to relatively long attack times (perhaps 30 ms).
Further, the compression is wideband, so the compression must be gentle to
prevent spectral gain intermodulation of the midrange by the bass.

The fact that there were so many questions about DRC in a newsgroup for audio
professionals emphasizes my point regarding its being poorly understood. If
pros don't understand it, consider the plight of consumers!

In article ,
says...


And what does that mean to us lay people? g You forget, we aren't that
versed in all the specs, and even some here don't know who you are anymore
(it's been a long time since you've posted here).

So how about expounding a little for those one in a thousand here that might
want to incorporate some surround environments, if you would be so kind.

--


Roger W. Norman
SirMusic Studio

"Robert Orban" wrote in message
...
In article ,
says...


it matters still.
What I can;t figure is why we're still doing this BACCKWARDS.
They USTA do it right... mak ea Great recording then treat specific
release
formats to suit
Mix and Master the stuff wide strong and clear
Sell a great 44/16 CD that has included pre-squashilated mp3 stuff on it
EVERY listening device has a squashilator circuit for playback,
choose to listen clean or pre-crunched.
I had a porta-CD player for years with a NASTY-assed playback compressor
button, it was GREAT in the car... can't find one anymore...

BOB ORBAN (and anyone else): whatever happened to the (Brit?) digital
broadcast system that had selectable playback dynamics at the reciever?

This is called "DRC" (for "dynamic range control metadata"). It's part of
both the Eureka 147 and Dolby AC-3 systems. In general, it's very poorly
understood by consumers. As far as I know, it's being implemented on a few
Eureka 147 streams. It's ubiquitous for Dolby AC-3, being part of the
Dolby
system spec, although, once again, probably not one AC-3 user in a
thousand
actually understands what it does.