"Dual Companding" yay

J

Jason Lavoie

Junior
Jan 13, 2011
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Ottawa
"All Q5X transmitters have dual companding, are frequency agile in the 600-698MHz UHF band and provide high quality broadcast audio."

in an age where we're trying to ditch companding, is there really a case where two is better than one? (or none)

also, anyone ever heard of this brand?

Jason
 
Re: "Dual Companding" yay

Perhaps it's dual band? It would be great if the increased midbass output of the capsule did not cause compression (and the resultant expansion) of the entire spectrum when the amplitude of the rest of the spectrum does not require it.
 
Re: "Dual Companding" yay

Jason Lavoie said:
"All Q5X transmitters have dual companding, are frequency agile in the 600-698MHz UHF band and provide high quality broadcast audio."

in an age where we're trying to ditch companding, is there really a case where two is better than one? (or none)

also, anyone ever heard of this brand?

Jason
Click to expand...

In theory dual companding, or two stages of 2:1 compression/expansion could be done and would generate 4:1 for even more NR and dynamic range. However there is no free lunch with such things so with 4:1 companding, channel frequency response errors would get expanded 4x, not just 2x. A digital RF path with very flat frequency response might get away with this. A secondary issue is that the transient response must wait for both channels to adjust.

Note: 2:1 companding for professional tape paths based on DBX VCAs were already approaching the noise floor of the premium gain elements, so stacking two in series would deliver diminishing benefit since the final result is dominated by the gain element noise floor. I expect the gain elements in cheap wireless to have even less dynamic range available.

Another possibility is they are referring to something completely different. never mind.

JR
 
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