ADV8003 Hardware Manual
Rev. B, August 2013
339
8.4.19.
SD Digital Noise Reduction
The ADV8003 encoder block offers a feature for digital noise reduction (DNR). DNR is applied to the Y data only. A filter block selects the
high frequency, low amplitude components of the incoming signal (DNR input select). The absolute value of the filter output is compared
to a programmable threshold value (DNR threshold control). Two DNR modes are available: DNR mode and DNR sharpness mode. Refer
to
BLOCK SIZE CONTROL
BORDER AREA
BLOCK OFFSET
CORING GAIN DATA
CORING GAIN BORDER
GAIN
DNR CONTROL
FILTER
OUTPUT
> THRESHOLD?
INPUT FILTER
BLOCK
FILTER OUTPUT
< THRESHOLD
DNR OUT
+
+
MAIN SIGNAL PATH
ADD SIGNAL
ABOVE
THRESHOLD
RANGE FROM
ORIGINAL SIGNAL
DNR
SHARPNESS
MODE
NOISE
SIGNAL PATH
Y DATA
INPUT
BLOCK SIZE CONTROL
BORDER AREA
BLOCK OFFSET
CORING GAIN DATA
CORING GAIN BORDER
GAIN
DNR CONTROL
FILTER
OUTPUT
< THRESHOLD?
INPUT FILTER
BLOCK
FILTER OUTPUT
> THRESHOLD
DNR OUT
MAIN SIGNAL PATH
SUBTRACT
SIGNAL IN
THRESHOLD
RANGE FROM
ORIGINAL SIGNAL
DNR MODE
NOISE
SIGNAL PATH
Y DATA
INPUT
–
+
06398-
078
Figure 121: SD DNR Block Diagram
In DNR mode, if the absolute value of the filter output is smaller than the threshold, it is assumed to be noise. A programmable amount
(coring gain border, coring gain data) of this noise signal is subtracted from the original signal. In DNR sharpness mode, if the absolute
value of the filter output is less than the programmed threshold, it is assumed to be noise. Otherwise, if the level exceeds the threshold,
now identified as a valid signal, a fraction of the signal (coring gain border, coring gain data) is added to the original signal to boost high
frequency components and sharpen the video image.
In MPEG systems, it is common to process the video information in blocks of 8 pixels × 8 pixels for MPEG2 systems or 16 pixels × 16
pixels for MPEG1 systems (block size control). DNR can be applied to the resulting block transition areas that are known to contain noise.
Generally, the block transition area contains two pixels. It is possible to define this area to contain four pixels (border area).
It is also possible to compensate for variable block positioning or differences in YCrCb pixel timing with the use of the DNR block offset.
The digital noise reduction registers are three 8-bit registers. They are used to control the DNR processing.
To enable the SD DNR feature,
must be programmed.
dnr_en
, Encoder Map,
Address 0xE481[7]
This bit is used to enable the SD Digital Noise Reduction (DNR) function.
Summary of Contents for ADV8003
Page 366: ...ADV8003 Hardware Manual Rev B August 2013 366 Figure 144 ADV8003 Schematic Page 4...
Page 367: ...ADV8003 Hardware Manual Rev B August 2013 367 Figure 145 ADV8003 Schematic Page 5...
Page 368: ...ADV8003 Hardware Manual Rev B August 2013 368 Figure 146 ADV8003 Schematic Page 6...
Page 369: ...ADV8003 Hardware Manual Rev B August 2013 369 Figure 147 ADV8003 Schematic Page 7...
Page 371: ...ADV8003 Hardware Manual Rev B August 2013 371 Figure 149 ADV8003 Schematic Page 9...
Page 372: ...ADV8003 Hardware Manual Rev B August 2013 372 Figure 150 ADV8003 Schematic Page 10...
Page 373: ...ADV8003 Hardware Manual Rev B August 2013 373 Figure 151 ADV8003 Schematic Page 11...
Page 374: ...ADV8003 Hardware Manual Rev B August 2013 374 Figure 152 ADV8003 Schematic Page 12...
Page 375: ...ADV8003 Hardware Manual Rev B August 2013 375 Figure 153 ADV8003 Schematic Page 13...
Page 376: ...ADV8003 Hardware Manual Rev B August 2013 376 Figure 154 ADV8003 Schematic Page 14...
Page 377: ...ADV8003 Hardware Manual Rev B August 2013 377 Figure 155 ADV8003 Schematic Page 15...
Page 378: ...ADV8003 Hardware Manual Rev B August 2013 378 Figure 156 ADV8003 Schematic Page 16...
Page 379: ...ADV8003 Hardware Manual Rev B August 2013 379 Figure 157 ADV8003 Schematic Page 17...
Page 380: ...ADV8003 Hardware Manual Rev B August 2013 380 Figure 158 ADV8003 Schematic Page 18...
Page 381: ...ADV8003 Hardware Manual Rev B August 2013 381 Figure 159 ADV8003 Schematic Page 19...
Page 382: ...ADV8003 Hardware Manual Rev B August 2013 382 Figure 160 ADV8003 Schematic Page 20...
Page 383: ...ADV8003 Hardware Manual Rev B August 2013 383 Figure 161 ADV8003 Schematic Page 21...
Page 384: ...ADV8003 Hardware Manual Rev B August 2013 384 Figure 162 ADV8003 Schematic Page 22...
Page 385: ...ADV8003 Hardware Manual Rev B August 2013 385 Figure 163 ADV8003 Schematic Page 23...
Page 386: ...ADV8003 Hardware Manual Rev B August 2013 386 Figure 164 ADV8003 Schematic Page 24...
Page 387: ...ADV8003 Hardware Manual Rev B August 2013 387 Figure 165 ADV8003 Schematic Page 25...
Page 388: ...ADV8003 Hardware Manual Rev B August 2013 388 Figure 166 ADV8003 Schematic Page 26...
Page 389: ...ADV8003 Hardware Manual Rev B August 2013 389 Figure 167 ADV8003 Schematic Page 27...
Page 390: ...ADV8003 Hardware Manual Rev B August 2013 390 Figure 168 ADV8003 Schematic Page 28...
Page 391: ...ADV8003 Hardware Manual Rev B August 2013 391 Figure 169 ADV8003 Schematic Page 29...
Page 392: ...ADV8003 Hardware Manual Rev B August 2013 392 Figure 170 ADV8003 Schematic Page 30...
Page 393: ...ADV8003 Hardware Manual Rev B August 2013 393 Figure 171 ADV8003 Schematic Page 31...
Page 395: ...ADV8003 Hardware Manual Rev B August 2013 395 Figure 173 ADV8003 Layout Page 2...
Page 396: ...ADV8003 Hardware Manual Rev B August 2013 396 Figure 174 ADV8003 Layout Page 3...
Page 397: ...ADV8003 Hardware Manual Rev B August 2013 397 Figure 175 ADV8003 Layout Page 4...
Page 398: ...ADV8003 Hardware Manual Rev B August 2013 398 Figure 176 ADV8003 Layout Page 5...
Page 399: ...ADV8003 Hardware Manual Rev B August 2013 399 Figure 177 ADV8003 Layout Page 6...
Page 400: ...ADV8003 Hardware Manual Rev B August 2013 400 Figure 178 ADV8003 Layout Page 7...
Page 401: ...ADV8003 Hardware Manual Rev B August 2013 401 Figure 179 ADV8003 Layout Page 8...
Page 427: ...ADV8003 Hardware Manual Rev B August 2013 427 P 2 Z Z Z P 1 Z Z Z P 0 Z Z Z...
