Chapter 5:
Menus: Video Setup
In TBC mode, generally for heterodyned signals from sources such as a VTR, the unit
will time base correct the composite input signal. The TBC indicator on the front of
the unit will be on.
In Auto-Switch mode, the unit will sense the incoming composite video signal and
select between Synch and TBC modes automatically as required. In this mode, the
TBC indicator will flash when the TBC is active.
The TBC is always used for S-Video input, independent of this setting.
3D Comb Decoder
Configures the operation of DPS’ proprietary 12-bit adaptive 3-dimensional comb
filter decoder. This option selects between adaptive 2D and adaptive 3D combing, and
for 3D combing, whether to comb luminance, chroma, or both. 3D combing combines
information from previous frames in order to cancel eliminate residual subcarrier
artifacts such as cross luminance and cross chroma.
3D combing can be utilized even for non-composite input signals. For example, if the
component input video source was decoded from composite by a less sophisticated
decoder, the 3D comb filter in the DPS-475/575 can be used to clean up the signal
and remove cross luminance and chroma artifacts.
Valid Settings: Disable, Luma, Chroma, Both Y+C
Default Setting: Both Y+C (525-line mode)
Luma (625-line mode)
Related Settings: Temporal NR-Luma, Temporal NR-Chroma,
3D Chroma Motion Bias
When set to Disable, 3D combing is disabled; adaptive 2D combing is used.
The Luma and Chroma settings enable 3D adaptive combing on luminance and
chrominance, respectively, while Both Y+C enables 3D adaptive combing on both.
Under normal circumstances, Both Y+C will be the desirable 3D combing mode. It is
not possible, however, to use both Temporal Noise Reduction and 3D combing on the
same channel simultaneously. (For example, if Temporal NR-Luma is enabled, 3D
combing of luminance is not possible, so the 3D comb decoder must be disabled or
set to Chroma.) This is not a problem; with a sufficient Temporal Noise Reduction
setting, there would be no benefit to using the 3D comb filter simultaneously.
Setting this option to Luma or Both Y+C automatically disables Temporal NR-Luma
(sets it to 3D Comb mode). Similarly, setting this option to Chroma or Both Y+C
automatically disables Temporal NR-Chroma (sets it to 3D Comb mode).
This setting will be automatically changed accordingly (disabling 3D combing on
luminance and/or chrominance) when Temporal NR-Chroma and/or Temporal NR-
Luma are enabled by the user.
See Chapter 8, “Menus: Noise Reduction” for more information on the Temporal
Noise Reduction settings.
3D Chroma Motion Bias
Adjusts the algorithm of the adaptive 3D comb decoder to compensate for high-
motion, color-intensive footage.
Valid Settings: Low, Normal, High, Extreme
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