SAA7118 Datasheet, PDF (3/169 Pages) NXP Semiconductors – Multistandard video decoder with adaptive comb filter and component video input

Philips Semiconductors
Multistandard video decoder with adaptive
comb filter and component video input
Preliminary specification
SAA7118
1 FEATURES
1.1 Video acquisition/clock
• Up to sixteen analog CVBS, split as desired (all of the
CVBS inputs optionally can be used to convert e.g.
Vestigial Side Band (VSB) signals)
• Up to eight analog Y + C inputs, split as desired
• Up to four analog component inputs, with embedded or
separate sync, split as desired
• Four on-chip anti-aliasing filters in front of the
Analog-to-Digital Converters (ADCs)
• Automatic Clamp Control (ACC) for CVBS, Y and C
(or VSB) and component signals
• Switchable white peak control
• Four 9-bit low noise CMOS ADCs running at twice the
oversampling rate (27 MHz)
• Fully programmable static gain or Automatic Gain
Control (AGC), matching to the particular signal
properties
• On-chip line-locked clock generation in accordance with
“ITU 601”
• Requires only one crystal (32.11 or 24.576 MHz) for all
standards
• Horizontal and vertical sync detection.
1.2 Video decoder
• Digital PLL for synchronization and clock generation
from all standards and non-standard video sources e.g.
consumer grade VTR
• Automatic detection of any supported colour standard
• Luminance and chrominance signal processing for
PAL B, G, D, H, I and N, combination PAL N, PAL M,
NTSC M, NTSC-Japan, NTSC 4.43 and SECAM
• Adaptive 2/4-line comb filter for two dimensional
chrominance/luminance separation, also with VTR
signals
– Increased luminance and chrominance bandwidth for
all PAL and NTSC standards
– Reduced cross colour and cross luminance artefacts
• PAL delay line for correcting PAL phase errors
• Brightness Contrast Saturation (BCS) adjustment,
separately for composite and baseband signals
• User programmable sharpness control
• Detection of copy-protected signals according to the
macrovision standard, indicating level of protection
• Independent gain and offset adjustment for raw data
path.
1.3 Component video processing
• RGB component inputs
• Y-P_B-P_R component inputs
• Fast blanking between CVBS and synchronous
component inputs
• Digital RGB to Y-C_B-C_R matrix.
1.4 Video scaler
• Horizontal and vertical downscaling and upscaling to
randomly sized windows
• Horizontal and vertical scaling range: variable zoom to
1_{⁄64 (icon) (note: H and V zoom are restricted by the}
transfer data rates)
• Anti-alias and accumulating filter for horizontal scaling
• Vertical scaling with linear phase interpolation and
accumulating filter for anti-aliasing (6-bit phase
accuracy)
• Horizontal phase correct up and downscaling for
improved signal quality of scaled data, especially for
compression and video phone applications, with 6-bit
phase accuracy (1.2 ns step width)
• Two independent programming sets for scaler part, to
define two ‘ranges’ per field or sequences over frames
• Fieldwise switching between decoder part and
expansion port (X-port) input
• Brightness, contrast and saturation controls for scaled
outputs.
1.5 Vertical Blanking Interval (VBI) data decoder
and slicer
• Versatile VBI-data decoder, slicer, clock regeneration
and byte synchronization e.g. for World Standard
Teletext (WST), North-American Broadcast Text
System (NABTS), close caption, Wide Screen Signalling
(WSS) etc.
2001 May 30
3