dbx Dynamics Duo Manual de revisión - Página 2

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Detection and the Dynamics Duo

Detection and the Dynamics Duo (or Why Do Some Compressors Sound Great

While Others Just Plain Don't?) A Discussion of the Benefits of True RMS Level

Detection and True RMS Power Summing

Detection? Dynamics Duo? Sounds like a confidential Gotham City document that Cat

Woman or the Riddler would like to get a hold of for blackmail purposes. Perhaps the terms

"sidechain" and "compression" sound a little more familiar. In this paper, we talk about these

terms and explain the important role that "detection" plays in a well-designed "dynamics

processor". Although we briefly mention VCA's, the purpose of this paper is to highlight

various detection schemes used by manufacturers, as well as the methods used to link

channels for stereo operation. We describe our True RMS Level Detection and True RMS

Power Summing methods that we at dbx profess to be the correct and logical, not to

mention best sounding ways to do dynamics processing.

1.Viscerally Compressed Amplitude

No, that's not what "VCA" stands for, as anyone familiar with compressors could tell you,

but we have a gut feeling you already knew that (pun intended)! VCA, of course, means

"Voltage Controlled Amplifier." The guts of any dynamics processor (compressor, limiter,

expander, gate, ducker, dynamic filter, modulator, etc.) contain, among other things, a VCA.

As a pioneer in the field of VCAs, dbx created the patented industry standard chip used by

the zillions by many major manufacturers of professional and consumer audio equipment.

You'll find our chips in dbx noise reduction systems throughout the world.

But this paper is not about VCA's.We know that it takes more than a great VCA to make

a great compressor. Much more. And that's where the years of leadership and expertise in

dynamics processing design make all the difference.

2. Dynamics Duo

The real art in making a great compressor is not only in the design and implementation

of the VCA, but in the design of the other, more important half of the

Detection and the Dynamics Duo - November 1998

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