Video Processing Amplifier; Video Gain; Chroma Gain; Black Level - pro bel V6402 HD User Manual

V6402, V6404, V6406, V6408
and V6418 HD converters
3.4

Video Processing Amplifier

3.4.1

Video Gain

PROC AMP
The adjustment range is ±6dB and it applies equally to the luminance and both of the chrominance
channels (Cb and Cr). The gain is applied after the black level offset. The Video gain is applied
simultaneously with the Chrominance gain so they can cancel one another out. For example +3dB of
Video gain along with –3dB of Chroma gain will result in the luminance being increased by +3dB and the
Cb and Cr channels being unchanged.
The output is limited to ensure that there is no numerical overflow as the output fits into the 10 bit D1
domain. There is no gamut legalisation function.
3.4.2

Chroma Gain

PROC AMP C Gain
The adjustment range is ±6dB and it applies equally both the chrominance channels. The gain is applied
along with the video gain and after the black level offset. The Chrominance gain is applied simultaneously
with the Video gain so they can cancel one another out. For example +3dB of Video gain along with –3dB
of Chroma gain will result in the luminance being increased by +3dB and the Cb and Cr channels being
unchanged.
The output is limited to ensure that there is no numerical overflow as the output fits into the 10 bit D1
domain. There is no gamut legalisation function.
3.4.3

Black Level

PROC AMP Blk Lvl
The adjustment range is –127 and +128 D1 levels (equivalent to -101/+102mV). The black level
adjustment is applied before the gain stages. This is considered the best arrangement since the unit is
usually used to correct incoming errors.
3.4.4

Hue Shift

PROC AMP Hue
The adjustment range of the hue shift is ±45° in 0.35° steps.
3.4.5

Dynamic Rounding

PROC AMP Dyn Rnd
Since some quantising effects may be visible on the output of this unit when variable gains are applied,
Dynamic Rounding has been applied. This Dynamic Rounding is only used to reduce the effects of the
fractional bits of lower significance than the normal 10 bits; it does not reduce the resolution to 8 bits.
This can be disabled on the PROC AMP : Dyn Rnd menu.
HU-V6402&4&6&8&18
V6402VP
V Gain
V6404VP V6406VP V6408VP V6418VP
45