NR on digital

  • 1
  • Question
  • Updated 4 years ago
Loving the upgrade, but one question...  The NR no longer seems to be available in DIGU or DIGL.  Is this a bug or a feature?

Photo of Rick Hadley - W0FG

Rick Hadley - W0FG

  • 518 Posts
  • 111 Reply Likes

Posted 4 years ago

  • 1
Photo of Neal - K3NC

Neal - K3NC, Elmer

  • 426 Posts
  • 126 Reply Likes
I think that the philosophy is that any noise processing done on data streams is destructive since almost all modems (software or hardware) have their own noise processing algorithms built in. Secondly, noise processin you do in the radio increases latency before the data is passed to the modem so for modes that require low latency, this will exacerbate problems.
Photo of Tim - W4TME

Tim - W4TME, Customer Experience Manager

  • 8461 Posts
  • 3160 Reply Likes
Noise reduction and ANF will adversely affect the decoding of digital mode signals.  Technically it is a feature.  You want to pass the audio unmolested to the digital mode program for decoding.  The same is true on transmit which is why all signal process (PROC & EQ) are disabled in DIGx modes.
Photo of Robert -- N5IKD

Robert -- N5IKD, Elmer

  • 488 Posts
  • 152 Reply Likes
Agreed, I want to know that when I am using digital that all filters intended for voice are turned off.