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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)： | 32/48頁 |
| 文件大?。?/td> | 1085K |
| 代理商： | ADV612 |
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ADV611/ADV612
–32–
REV. PrA
PRELMNARY
TECHNCAL
DATA
HARRIS
8115
CLK2
CLK2
27MHz
PIXEL CLOCK GSC
VCLK
VDATA (0–7)
ADV611
P8–P15
8
Figure 20. Using the Harris 8115 Decoder
GETTING THE MOST OUT OF ADV611/ADV612
How Much Compression Can Be Expected
The ADV611/ADV612 can be used in applications where
up to 7500:1 compression is required. To express this in
more meaningful terms, a digitized NTSC video signal at
167 MBit/s per second can be reduced to less than 25 kbits
per second. To achieve this performance, the following ap-
proach could be used:
1. Image Compressed to 250:1
2. Frame Rate Reduced to 1 frame per second (not uncommon
in CCTV applications)
3. Quality box size less than 1% of the total image size
4. Background contrast attenuated by 18 dB
The scenario described above used by Analog Devices on the
CCTVPIPE evaluation board as the splash-screen after power-
up. Video quality is subjective, and therefore, it is highly recom-
mended to perform a direct evaluation of the CCTVPIPE or the
ADV601 software codec to confirm that the compression per-
formance is appropriate for a given application.
While the ADV611/ADV612 can be used in very high compres-
sion applications as outlined above, it is equally suitable for full
resolution, 60 field per second visually loss-less applications.
Evaluation Board
There is a low cost stand-alone evaluation board for the ADV611
called the CCTVPIPE (see block diagram). The CCTVPIPE
provides a fast, simple, and low cost means of evaluating the
performance of the ADV611 and it is very similar to the evalua-
tion board for the ADV601LC, the VideoPipe. The CCTVPIPE
is shipped with a small mouse to allow real-time quality box
control. The board is also shipped with a small speaker to pro-
vide an audio alert signal when motion is detected in the video
image. All of the source code and schematics for the CCTVPIPE
are available from the Analog Devices Web site free of charge
(www.analog.com).
The exact part number is ADV611-CCTVPIPE and it can be
purchased through any Analog Devices authorized sales chan-
nel. Since the ADV611 and ADV612 have the same feature set,
there is only one evaluation board for both parts.
A PCI card is available for the ADV601 called the “VideoLab,”
which is bitstream compatible with the ADV611/ADV612. See
the Analog Devices WWW site for further details.
Software Codec
Analog Devices has created two types of software products for
cases where encoding or decoding in software are desirable.
Bit Exact Codec –
Nonreal-time bit exact encoder for
Windows ’95 or ’98.
MMX/DirectShow Player –
Reall-time playback for
Windows ’98 (PC monitor can be used to view the video
directly–no need for a dedicated TV monitor).
Field Rate Reduction
As demonstrated by the CCTVPIPE evaluation board, field
rates can be reduced to increase compression. The ADV611
descriptions).
Edge Enhancement and Detection
Since the ADV611/ADV612 filters the image into wavelet
subbands, edge information is isolated in the high pass blocks of
image data (see the Mallat diagram of the Analog Devices build-
ing in the ADV601LC data sheet for an illustration). By zeroing
the low pass blocks, the ADV611/ADV612 will preserve only
the high pass content of the image and thus enhance the edges
this feature. Furthermore, these blocks can be Huffman de-
coded and analyzed for edge detection purposes.
Motion Detection
There are two known means of implementing motion detection
with the ADV611/ADV612.
1. Compare the image statistics between fields of video. This is
the technique used on the CCTVPIPE for the motion detec-
tion demo.
2. Decode the smallest Mallat block (Block 39) and compare
one field to the next. Since these block are small (approximately
2400 pixels) the computational burden is much less than it
would be for the entire image. For comparative purposes, the
data samples in Block 39 contain only 1/1024th of the total
samples, or 1/512th the luminance samples.
Thermal Considerations of Using the ADV611 vs. ADV612
The EDQUAD package used with the ADV612 is designed to
offer extended temperature range operation (see Table II).
SE(SPORT)
JP17
DRAM
ADSP-2185
H/W RESET
JP16
RP1
ADV611
H/W RESET
ADV7175
DRAM
ADV611
H/W RESET
SAA7111
Y/C
J2
CJ11
SRAM
ROM
SRAM
PALS
R
F
U
D
S
PUSH
BUTTONS
CCIR-J12
+5J10
ADV611
CCTVPIPE
Y/C
J8
CVBS
J7
CCIR-656
Figure 21. ADV611 CCTVPIPE Block Diagram
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相關(guān)代理商/技術(shù)參數(shù) |
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