And so it came to pass, on 03-17-97 21:22,
   that Kenneth Parrish spake unto Cameron Hall:
CH>> frequencies that are audible also act as "bias" for low audio
CH>> frequencies, thus by varying the bias, a more optimum recording can
CH>> be
 KP> Could HXPro improve if it measures bias need and adjusts?
HX-Pro doesn't test and adjust the bias to match different tape formulations, 
although there are high-end decks that can do automatic bias tuning.
To understand the concept behind HX-Pro, you have to understand what "bias" 
is and why it's used.  Very briefly, it's very-high-frequency (not VHF though 
:) sine signal, typically 40kHz-80kHz or higher, that boosts the signal on 
the tape to avoid "zero-crossing" distortion.  When there's significant 
high-frequency content in the input signal itself, that signal acts to 
partially bias the overall signal.  In these cases, HX-Pro lowers the level 
of the record bias, thereby allowing more headroom for the higher audio 
frequencies.  more headroom means a hotter signal can then be recorded 
without pushing the tape into saturation (and thus, distortion).
-------------------------------------------
Love, luck, and lollipops...
Matt


--- Sqed/32 1.10/unreg
---------------