參數(shù)資料
型號(hào)： SAA4979H
廠商： NXP SEMICONDUCTORS
元件分類： 消費(fèi)家電
英文描述： Sample rate converter with embedded high quality dynamic noise reduction and expansion port
中文描述： SPECIALTY CONSUMER CIRCUIT, PQFP128
封裝： 28 X 28 X 3.40 MM, PLASTIC, QFP-128
文件頁(yè)數(shù)： 10/52頁(yè)
文件大小： 224K
代理商： SAA4979H
2002 May 28
10
Philips Semiconductors
Product specification
Sample rate converter with embedded high quality
dynamic noise reduction and expansion port
SAA4979H
handbook, full pagewidth
LUMINANCE 100%
+
235
+
128
+
16
0
white
black
U-COMPONENT
+
255
+
240
+
212
+
212
+
128
+
16
+
44
0
blue 100%
blue 75%
yellow 75%
yellow 100%
colourless
V-COMPONENT
+
255
+
240
+
128
+
16
+
44
0
red 100%
red 75%
cyan 75%
cyan 100%
colourless
MHC201
Fig.3 Digital video input levels.
It should be noted that the input levels are limited to 1 to 254 in accordance with ITU 601/656 standard.
a. Y output range.
b. U output range (C
B
).
c. V output range (C
R
).
7.1.2
D
OUBLE WINDOW AND PICTURE
-
IN
-
PICTURE
PROCESSING
Data from the sub channel can be inserted into the data
stream of the main channel by means of a fast switch. The
two channels can be used together with one or two
external field memories to implement, for example, double
window or PIP processing. Both field based and frame
based PIP processing is supported. The synchronization
of the sub channel to the main channel is achieved by
providing synchronized read signals (RE2 and RSTR2) for
the external field memories, whereas the write signals
need to be provided together with the incoming data by the
external signal source.
A multi-PIP mode is also supported by freezing the data in
the internal field memory within certain areas via the
programmable internal control signal IE
int
.
7.1.3
B
LACK BAR DETECTOR
Black bar detection searches for the last black line in the
upper part of the screen and for the first black line in the
lower part of the screen. The detection is done within a
programmable window (control inputs: bbd_hstart,
bbd_hstop, bbd_vstart and bbd_vstop). To avoid
disturbances of LOGOs in the video, the window can be
shifted to the horizontal centre of the lines. A video line is
considered to be black if the luminance values of that line
within the detection window are not greater than a certain
slice level (control input: bbd_slice_level) for more than a
specific number of pixels (control input: bbd_event_value).
The numbers of the first and the last active video line can
be read out by the microcontroller (control outputs:
bbd_1st_videoline and bbd_last_videoline).
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