參數(shù)資料
型號： VPX322XE
廠商： MICRONAS SEMICONDUCTOR HOLDING AG
英文描述： Video Pixel Decoders
中文描述： 視頻解碼器像素
文件頁數(shù)： 15/92頁
文件大?。?/td> 567K
代理商： VPX322XE
ADVANCE INFORMATION
VPX 322xE
15
Micronas
2.5. Macrovision Detection
Video signals from Macrovision encoded VCR tapes are
decoded without loss of picture quality. However it might
be necessary in some applications to detect the pres-
ence of Macrovision encoded video signals. This is pos-
sible by reading a status register (FP-RAM 0x170).
Macrovision encoded video signals typically have AGC
pulses and pseudo sync pulses added during VBI. The
amplitude of the AGC pulses is modulated in time. The
Macrovision detection logic measures the VBI lines and
compares the signal against programmable thresholds.
The window in which the video lines are checked for Ma-
crovision pulses can be defined in terms of start and stop
line (e.g. 6
–
15 for NTSC).
2.6. Component Processing
Recovery of the YC
b
C
r
components by the decoder is
followed by horizontal resizing and skew compensation.
Contrast enhancement with noise shaping can also be
applied to the luminance signal. Vertical resizing is sup-
ported via line dropping.
Fig. 2
–
12 illustrates the signal flow through the compo-
nent processing stage. The YC
b
C
r
4:2:2 samples are
separated into a luminance path and a chrominance
path. The Luma Filtering block applies anti-aliasing low-
pass filters with cutoff frequencies adapted to the num-
ber of samples after scaling, as well as peaking and cor-
ing. The Resize and Skew blocks alter the effective
sampling rate and compensate for horizontal line skew.
The YC
b
C
r
samples are buffered in a FIFO for continu-
ous burst at a fixed clock rate. For luminance samples,
the contrast and brightness can be adjusted and noise
shaping applied. In the chrominance path, C
b
and C
r
samples can be swapped. Without swapping, the first
valid video sample is a C
b
sample. Chrominance gain
can be adjusted in the color decoder.
Resize
Skew
Resize
Skew
Sequence
Control
F
I
F
O
16 bit
Contrast,
Brightness &
Noise shaping
Active Video
Reference
Latch
Luma Filter
with peaking
& coring
Y
out
C
rout
Y
in
C
b
C
rin
Luma
Phase Shift
Chroma
Phase Shift
Fig. 2
–
12:
Component processing stage
C
b
/C
r
-
swapping
Table 2
–
2:
Several rasters supported by the resizer
NTSC
PAL/SECAM
Format Name
640 x 480
768 x 576
Square pixels for broadcast TV (4:3)
704 x 480
704 x 576
Input Raster for MPEG-2
320 x 240
384 x 288
Square pixels for TV (quarter resolution)
352 x 240
352 x 288
CIF
–
Input raster for MPEG-1, H.261
160 x 120
192 x 144
Square pixels for TV (1/16 resolution), H.324, H.323
176 x 120
176 x 144
QCIF
–
Input raster for H.261
32 x 24
32 x 24
Video icons for graphical interfaces (square)
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