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Introduction
This
AL242 Evaluation Kit is specially designed
for evaluating the AL242 Adaptive 2D Comb
Filter Video Decoder. The evaluation kit
allows maximum flexibility for optimizing
various input and output modes for
specific applications. Using the hardware
and software provided in the Evaluation
Kit, Standalone and PC-Based mode can
be demonstrated. In addition, there are
many new hardware and software functions
provided in this edition including Binary
Switch, Fast Channel Switch, Close Caption
VBI detect and display, Macrovision™
copy–protect signal detect
AL242
Adaptive 2D Comb Filter Video Decoder
The AL242 is a silicon efficient, cost
effective high video quality NTSC/PAL/SECAM
video decoder with 2D-Comb filtering.
The AL242 decodes NTSC/PAL/SECAM composite
video, Svideo or component video and converts
it into YUV 4:2:2, 8-bit digital video
respectively. Employing adaptive 2D comb
filter technology, the AL242 is able to
provide high quality Y/C separation while
maintaining excellent frequency response.
The result is sharp, high detail video
that eliminates unwanted dot crawl and
false color effects.
Fully programmable video characteristic
control, such as hue, contrast, brightness,
and saturation are supported. The AL242
decoder incorporates an advanced vertical
blanking interval (VBI) data processor
to do data slicing, parsing and decoding
teletext, closed caption, and other formats.
The Macrovision™ copy-protect signal
is auto-detected and reports to the registers.
Two wires of fast channel switching input
allow the decoder to do an instant alternation
of analog CVBS input from one to the other.
Up to 4 serial bus addresses can be selected
via 2 configuration pins that allow multiple
AL242 chips on the design without extra
logic.
Applications for
the AL242C chipset
-
Image Processing
- Format
Converter Systems
- Video
Editing
- Video
Capture Devices.
- Set
Top Box Decoders.
- Mobile
Systems
- Handheld
Application
- Video
Surveillance System
- Personal/Digital
Video Recorder
- Video
Phone
- Networking
Video, etc.
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Key
Features
- Decodes
NTSC, PAL and SECAM composite video,
S-video or component video
- Supports
all variations of the NTSC standard
– (M, 4.43)
- Supports
all variations of the PAL standard –
(I, B, G, H, D, N, M, combination N).
- 2x
10-bit A/D converters
- Supports
digital automatic gain control (AGC)
- 4
analog inputs with internal switches
among four analog inputs - e.g. 4xCVBS,
2xS-Video, (2xCVBS & 1xS-Video)
or 1xYPbPr component
- Standard
8-bit ITU-R.BT656, 16-bit ITU-R.BT601
along with separate sync signals, YCbCr
4:2:2 or 22-bit YCbCr 4:4:4 interlaced
format output (* Please contact AverLogic
for 16-bit
ITU-R.BT601& 22-bit YCbCr 4:4:4
formats support)
- Line-Locked
system clock frequencies.
- Excellent
quality Y/C separation – minimizes
cross luma and cross color effects
- Superior
frequency response preserves fine detail
- Adaptive
2D Comb Filter
- 3-line 2D Comb filter for NTSC
- 5-line 2D Comb filter for PAL
- Software
support format detection of video standard
(NTSC, PAL or SECAM)
- BCS
(Brightness/Contrast/Saturation and
Hue) control
- Auto
detects and locks VCR trick modes
- Supports
VBI decoding
- Decodes
weak and noisy off-air signals
- Hardware
channel switching
AL242
- Auto
detects and decodes Macrovision™
copy-protect signal
-
Two-wire serial bus programming with
up to 4 serial bus sub-addresses selectable
- Supports
software power down mode
- 3.3V
and 1.8V mix low power supply
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