cx25870 Conexant Systems, Inc., cx25870 Datasheet - Page 75

• Manufacturer Part Number: cx25870
• Description: Video Encoder With Adaptive Flicker Filtering And Hdtv Output
• Manufacturer: Conexant Systems, Inc.

CX25870/871
Flicker-Free Video Encoder with Ultrascale Technology
1.3.36 Chrominance and Luminance Processing
100381B
analog NTSC video systems. CGMS stands for Copy Generation Management
System whereby scan line 23 of PAL Field 1 or lines 20 and 283 of NTSC video
outputs contains a data burst which details the signal format. The burst also
specifies the aspect ratio, type of enhanced services, and subtitle location for the
TV to use during the broadcasted show.
whether a recording device can make no copies, one copy, or unlimited copies. If
no copies are allowed, the recording device will not make a copy. If a single copy
is allowed, the recording device will make one copy and change the CGMS data
to indicate that no future copies can be made from the native content.
CGMS/A are as follows:
Once the input data is converted to internal YUV format, the Y and UV
components are filtered and upsampled to the system clock frequency.
response illustrated in
enabled (see
field. The peaking filters are optimized for high bandwidth frequency response,
and optimal picture quality.
alternate wide bandwidth response can be selected using register bit
CHROMA_BW, as illustrated in
modulated chrominance signal.
The CX25870 does not support the CGMS/A standard for analog PAL or
In addition to the details about the signal format, the CGMS bits can indicate
The major reasons the CX25870 does not support the analog method of
• No movie studio even considers the notion of allowing the user to make a
• There are no plans for DVD content providers to allow users to make
• Some aspects of the CGMS/A system are not pirate-proof and can be
• The CGMS/A standard appears to be a vendor rather than a DVD
The luminance signal is always low-pass filtered using the upsampling filter
The default chrominance filter response is illustrated in
Figure 1-30
single copy. All DVDs released from the movie industry now enable the
Macrovision copy protection system so it is impossible to make any copies
of DVDs in the analog domain.
limited copies of their intellectually copyrighted material.
disabled remotely.
consortium mandate. Only a few DVD players have this feature now, and it is
expected that they will abandon this as newer versions of the Macrovision
standard are released or a tamper-proof version of CGMS exists.
Figures
illustrates the SECAM pre-emphasis filter response for the
Conexant
1-25, 1-26, and 1-27), using the PKFIL_SEL[1:0] register
Figure
1-24. Additional peaking or reduction filters can be
Figure
1-29.
1.0 Functional Description
Figure
1.3 Device Description
1-28, but an
1-59