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參數(shù)資料
| 型號： | ADV612 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 視頻Codec |
| 英文描述： | Closed Circuit TV Digital Video Codec(閉路電視數(shù)字視頻編碼譯碼器) |
| 中文描述： | 閉路電視數(shù)字視頻編解碼器（閉路電視數(shù)字視頻編碼譯碼器） |
| 文件頁數(shù)： | 1/48頁 |
| 文件大?。?/td> | 1085K |
| 代理商： | ADV612 |
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REV. PrA
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
a
Preliminary Technical Data
ADV611/ADV612
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
Analog Devices, Inc., 1998
TECHNCAL
TECHNCAL
DATA
Closed Circuit TV Digital
Video Codec
FUNCTIONAL BLOCK DIAGRAM
QUANTIZER
& ENTROPY
CODING
HOST
I/O PORT
& FIFO
HOST
ADV611/
ADV612
256K
3
16-BIT DRAM
COMPONENT
VIDEO I/O
BIN WIDTH CONTROL
LOCATION, SIZE AND CONTRAST CONTROL
SUBBAND STATISTICS
8
16/32
DIGITAL
VIDEO
I/O PORT
WAVELET
FILTERS,
DECIMATOR &
INTERPOLATOR
QUALITY
BOX
CONTROL
ON-CHIP
TRANSFORM
BUFFER
DRAM
MANAGER
FEATURES
Programmable “Quality Box”
Hardware Frame Rate Reduction
100% Bitstream Compatible with the ADV601 and
ADV601LC
Precise Compressed Bit Rate Control
Field Independent Compression
8-Bit Video Interface Supports CCIR-656 and Multi-
plexed Philips Formats
General Purpose 16- or 32-Bit Host Interface With
512 Deep 32-Bit FIFO
PERFORMANCE
Real-Time Compression or Decompression of CCIR-601
to Video:
720
3
288 @ 50 Fields/Sec — PAL
720
3
243 @ 60 Fields/Sec — NTSC
Compression Ratios from Visually Loss-Less to 7500:1
Visually Loss-Less Compression At 4:1 on Natural
Images (Typical)
APPLICATIONS
CCTV Cameras and Systems
Time-Lapse Video Tape Recorders
Time-Lapse Video Disk Recorders
Wireless CCTV Cameras
Fiber CCTV Systems
ADV612 is Intended for Extended Temperature
Applications
GENERAL DESCRIPTION
The ADV611 and ADV612 are a low cost, single chip, dedicated
function, all digital CMOS VLSI devices capable of supporting
visually loss-less to 7500:1 real-time compression and decom-
pression of CCIR-601 digital video at very high image quality
levels. The chips integrate glueless video and host interfaces
with on-chip SRAM to permit low part count, system level
implementations suitable for a broad range of applications. The
ADV611 and ADV612 are 100% bitstream compatible with the
ADV601.
The ADV611 and ADV612 provide identical functionality. The
difference between these chips is that the ADV611 comes in a
TQFP package and the ADV612 comes in an EDQUAD TQFP
package. Where you see ADV611/ADV612 in this document,
the information applies to both components.
The ADV611 and ADV612 are video encoders/decoders opti-
mized for closed circuit TV (CCTV) applications. With the
ADV611 and ADV612, you can define a portion of each video
field to be at a higher quality level relative to the rest of the field.
This “quality box” feature significantly increases compression of
less important background details, while retaining the image’s
overall context. Additionally, the unique subband coding archi-
tecture of the ADV611 and ADV612 offers you many applica-
tion-specific advantages. A review of the General Theory of
Operation and Applying the ADV611/ADV612 sections will
help you get the most use out of the ADV611 or ADV612 in any
given application.
The ADV611 and ADV612 accept component digital video
through the Video Interface and outputs a compressed bitstream
though the Host Interface in Encode Mode. While in Decode
through the Host Interface and outputs component digital video
through the Video Interface. The host accesses all of the ADV611
or ADV612’s control and status registers using the Host Interface.
Figure 2 summarizes the basic function of the part.
(continued on page 2)
DECODER
ADV611/
ADV612
ADSP-21xx
ANALOG
VIDEO
SIGNAL
IMAGE
SENSOR
SIGNAL
OR
QUALITY BOX CONTROLS
SERIAL
OR PARALLEL
BITSTREAM FOR
TRANSMISSION
OR STORAGE
DIGITIZER
Figure 1. Typical Application
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