vpx3224d ETC-unknow, vpx3224d Datasheet - Page 14

• Manufacturer Part Number: vpx3224d
• Description: Video Pixel Decoders
• Manufacturer: ETC-unknow

14
VPX 3225D, VPX 3224D
2.5. Component Processing
Recovery of the YCbCr 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. 2–11 illustrates the signal flow through the compo-
nent processing stage. The YCbCr 4:2:2 samples are
separated into a luminance path and a chrominance
Fig. 2–11: Component processing stage
Table 2–2: Several rasters supported by the resizer
Y
Active Video
Reference
CbCr
in
NTSC
640 x 480
704 x 480
320 x 240
352 x 240
160 x 120
176 x 120
32 x 24
in
PAL/SECAM
768 x 576
704 x 576
384 x 288
352 x 288
192 x 144
176 x 144
32 x 24
Luma Filter
with peaking
& coring
Format Name
Square pixels for broadcast TV (4:3)
Input Raster for MPEG-2
Square pixels for TV (quarter resolution)
CIF – Input raster for MPEG-1, H.261
Square pixels for TV (1/16 resolution), H.324, H.323
QCIF – Input raster for H.261
Video icons for graphical interfaces (square)
Resize
Resize
Sequence
Control
Luma
Phase Shift
Chroma
Phase Shift
Skew
Skew
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 YCbCr 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, Cb and Cr
samples can be swapped. Without swapping, the first
valid video sample is a Cb sample. Chrominance gain
can be adjusted in the color decoder.
Latch
16 bit
O
F
F
I
PRELIMINARY DATA SHEET
Noise shaping
Brightness &
Contrast,
swapping
Cb/Cr-
Micronas
Y
Cr
out
out