ADV612BST Analog Devices Inc, ADV612BST Datasheet - Page 32

• Manufacturer Part Number: ADV612BST
• Manufacturer: Analog Devices Inc

Specifications of ADV612BST

• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (min): 4.5V
• Operating Supply Voltage (max): 5.5V
• Operating Temp Range: -25C to 85C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 120
• Lead Free Status / Rohs Status: Compliant

ADV611/ADV612
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 approach could be used:
1. Image Compressed to 250:1
2. Frame Rate Reduced to 1 frame per second (not uncommon
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/ADV612 and it is very similar to
the evaluation 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 provide 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/wavelet).
Windows is a registered trademark of Microsoft Corporation.
in CCTV applications)
Figure 20. Using the Harris 8115 Decoder
HARRIS
8115
CCIR-656
+5VDC
CVBS
Y/C
J11
J12
J10
J2
CLK2
CLK2
PIXEL CLOCK GSC
P8–P15
CCTVPIPE
ADV611
SAA7111
27MHz
8
VDATA (0–7)
VCLK
ADV611/ADV612
Figure 21. ADV611 CCTVPIPE Block Diagram
ADV611
DRAM
H/W RESET
SERIAL PORT
(SPORT)
JP17
SRAM
SRAM
ADSP-2185
EZ-ICE
JP16
–32–
H/W RESET
The exact part number is ADV611-CCTVPIPE and it can be
purchased through any Analog Devices authorized sales channel.
A PCI card is available for the ADV601 called the “VideoLab,”
which is bitstream compatible with the ADV611/ADV612. See
the Analog Devices Web 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
• MMX/DirectShow Player – Real-time playback for
Field Rate Reduction
As demonstrated by the CCTVPIPE evaluation board, field
rates can be reduced to increase compression. The ADV611/
ADV612 allow this to be done in hardware (see register
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
in the image. The CCTVPIPE has a mode that demonstrates
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
2. Decode the smallest Mallat block (Block 39) and compare
PALS
ROM
RS-232
Windows
Windows ’98 (PC monitor can be used to view the video
directly–no need for a dedicated TV monitor).
the technique used on the CCTVPIPE for the motion detec-
tion demo.
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. Please Contact
Analog Device, Inc. for information on how to implement
this technique with quality box placement.
P1
ADV611
®
DRAM
H/W RESET
’95 or ’98.
PUSH
BUTTONS
ADV7175
CCIR-656
J13
Y/C
J8
CVBS
J7
REV. 0