> The terminology is the epitome of obfuscation!
Not at all ... "predistortion" has been used in TV broadcasting for
more than 40 years - even back in analog TV. It started as simple
non-linear amplifiers ("proc amps") perhaps 75 years ago to adjust
for the different levels of compression in the amplifier chain with
differing signal levels. However, with the advent of solid state
amplifiers at VHF and MSDC klystrons/IOTs at UHF additional levels
of "predistortion" were employed to cancel the regeneration of the
lower sideband from to *IMD* due to operating well beyond the 1 dB
compression point.
Of course those techniques carried over into digital (HD) TV and
were employed by the cellular industry with the conversion from
analog to digital.
"Predistortion" is a perfectly understandable term to anyone who
has a passing familiarity with the behavior of amplifiers in
compression.
73,
... Joe, W4TV
On 2020-09-15 6:55 PM, Andy Durbin wrote:
" Now I understand better what the discussion is all about."
Who ever coined the term "predistortion" should be taken behind the bicycle
shed and introduced to a 2x4. The terminology is the epitome of obfuscation!
Andy, k3wyc
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