CX25870/871
3.0 PC Board Considerations
Flicker-Free Video Encoder with Ultrascale Technology
3.6 Applications Information
3.6.2 Programmable Video Adjustment Controls
The quality of the TV Out picture can be altered depending on the digital input
content, the settings of various output video adjustment control registers, and the
TV itself. The values of the CX25870/871’s Y_OFF, MY, Y_ATTEN, MCB,
MCR, C_ATTEN, and PHASE_OFF registers all definitely impact the perceived
quality of the analog NTSC/PAL/SECAM video signal. For this reason, for
graphics cards that utilize the encoder, Conexant recommends the inclusion of a
Graphical User Interface (GUI) for TV Out. By designing this intelligent control
panel, the end-user can improve his TV image quality by adjusting the proper
slider or other controls at his disposal. Behind these controls, intelligence must be
embedded in the TV Out source code and driver so the values of certain registers
get adjusted depending on the status of the radio button, checkbox, slider, or
pulldown menu.
An illustration of a sample GUI for TV Out is shown in Figure 3-6.
Figure 3-6. Conexant Recommended TV Out GUI for CX25870/871
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Conexant
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CONEXANT [ CONEXANT SYSTEMS, INC ]
