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| 型號： | IBM39ENV420PBA17C |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PBGA |
| 封裝： | HPBGA PACKAGE |
| 文件頁數(shù)： | 2/4頁 |
| 文件大?。?/td> | 926K |
| 代理商： | IBM39ENV420PBA17C |
Note: (+) - Field memory or SDRAM attachment requires a minimal amount of external glue logic.
Figure 2: Block diagram of eNV SD encoder
Key Capabilities for Professional
Digital Video Encoding
IBM eNV SD encoders provide a
compact, high-quality solution for
Standard Denition (SD) broadcast,
acquisition, contribution, and
transmission applications. These
single chip solutions support
encoding at 4:2:2 P@ML with a
search range of up to +/-200 H and
+/-128 V. Selectable on-chip lters
produce high quality pictures for
both 4:2:2 and 4:2:0 output. Pro-
grammable on-chip noise reduction
lters enhance encoded picture
quality at lower bit rates. eNV SD
encoders employ a proprietary IBM
rate control algorithm to provide
high picture quality and include the
following capabilities:
Noise reduction
When encoding source material that
is grainy or spatially complex, special
on-chip noise reduction lters can be
programmed to help optimize picture
quality. Such ltering helps reduce
Host Processor
Communication
Digital Video
Data Input
16
8 (CCIR 656)
or
16 (CCIR 601)
SDRAM
(8 MB Minimum)
32
FIFO,
Field Memory,
or SDRAM (+)
eNV Video Encoder
pixel data uctuation, resulting in
improved encoding efciency. Input
picture preprocessing consists of
8-tap horizontal, 4-tap vertical, and
2-tap temporal ltering.
Image resizing
In applications where the horizontal or
vertical image needs to be reduced,
on-chip resizing lters can be
programmed to further optimize
picture quality within the available
bandwidth. These lters provide
cost-effective preprocessing methods
for resizing input pictures both
horizontally and vertically.
Motion estimation
To achieve higher compression ratios,
motion estimation removes redundancy
in pictures that are part of a video
sequence using a hierarchical scheme
with half pel accuracy to yield the best
match. Adaptive frame/eld motion
estimation on each macroblock
minimizes bit usage and maximizes
encoding efciency.
Programmable quantization tables
Luminance and chrominance
quantization tables can be pro-
grammed separately by the user.
Single memory interface
eNV SD encoders are designed
with a unied memory interface,
minimizing the number of required
external memory devices.
Selectable PES or ES output
To make synchronization of com-
pressed video output with audio
easier, eNV SD encoders can be
congured to output compressed
video in packetized elementary
stream (PES) format.
Field upgradable common
hardware platform
The use of a common hardware
platform makes it possible to develop
a single board design for multiple
products, helping to lower board
design time and expense. After
signing a software license agreement,
customers will be allowed to eld
upgrade from eNV 420 to eNV 422 via
a simple microcode change. This
means that system products designed
by our customers, using the eNV 420
encoder, may be planned for remote
eld upgradability.
Single clock input
All on-chip clocks are derived from
a single 27-MHz clock input using
an internal PLL.
Enhanced user data support
eNV SD encoders make use of the
ATSC Digital Television Standard
A/53, which denes a format for
storing closed-caption and
emergency-message data as user
data in a compressed bit stream.
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