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參數(shù)資料
| 型號： | SAA7201 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Integrated MPEG2 AVG Decoder(綜合MPEG音頻視頻圖表譯碼器) |
| 中文描述： | 集成MPEG2解碼器的AVG（綜合的MPEG音頻視頻圖表譯碼器） |
| 文件頁數(shù)： | 18/36頁 |
| 文件大?。?/td> | 292K |
| 代理商： | SAA7201 |
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1997 Jan 29
18
Philips Semiconductors
Objective specification
Integrated MPEG2 AVG decoder
SAA7201
C
URSOR PROCESSING
Additionally to the above defined graphics boxes one
cursor can be activated on the screen. Since the cursor
data is fully stored locally, no overlapping restriction apply
to this box so the cursor can moved over the entire screen.
The cursor can be as large as 1 kpixel with a 2 bits/pixel
colour depth. Obviously data transfer can be done on DMA
basis and need only be performed when a cursor is
required or when its contents must be modified.
The cursor XY dimensions (where the Y dimension refers
to frame lines) can be selected between 8
×
128, 16
×
64,
32
×
32, 64
×
16 and 128
×
8. On top of these shapes, a
zoom with a factor 2 can be applied in both directions
independently.
The cursor pixels will be translated via a 4-entry CLUT to
YUV colours and a transparency factor T. The resolution
of the YUV parameters is 6, 4, 4 bits respectively.
The T parameter is coded in 2 bits to enable the mixing
with video and graphics in 4 steps being 100% (cursor
only), 50%, 25% and 0% (fully transparent cursor).
Display unit
Before feeding the MPEG decoded and graphical data to
the output, a display unit re-formats the MPEG specific
4 : 2 : 0 format to CCIR-601 4 : 2 : 2 format and performs
a mixing between video and graphics where required.
The output picture can be up to 720
×
576 pixels at 50 Hz
or 720
×
480 pixels at 60 Hz.
A schematic representation of this unit is shown in Fig.11.
In a first step a selected window can be retrieved from
the decoded MPEG data. This might be useful for e.g.
pan and scan operations for aspect ratio conversion.
In case the resulting number of pixels per line does not
match the 720 pixels/line output format a horizontal
scaler can be activated. This scaling unit can transform
any number of bits below 720 to the required output
format. Internally a poly-phase filter is used which
performs a 64 phases interpolation. Not only
up-conversion but also down-conversion is supported
up to a scaling by a factor 2. Thus horizontal scaling can
be performed in a range from 0.5 up to 64. In practice
the maximum up-conversion factor will be less or equal
to 4.
In vertical direction the picture can be expanded or
scaled down, in both cases by a factor 2. Expansion with
a factor 2 might be relevant for the up-conversion of SIF
resolution pictures to full screen. The factor 2 scaling, if
combined with the appropriate horizontal scaling, results
is
1
4
picture thus freeing-up a large screen area for
graphics. This might be very useful for electronic
program guide applications. It should be noted that in
case of picture compression an anti-aliasing filter can be
activated.
Shifting: when the resulting MPEG picture is smaller
than the 720
×
576 (480) display format, this picture can
be located anywhere on the display screen.
Moreover, the non-covered area can be given any
background colour.
Clipping: the amplitude of the MPEG decoded and
re-scaled video signal is kept within the range 16 to 235
for luminance and 16 to 240 for both chrominance
components.
Fig.11 Display unit.
handbook, full pagewidth
WINDOW
EXTRACTION
SCALING
64 STEP
MIXER
4 STEP
MIXER
GRAPHICS
CURSOR
OUTPUT
FORMAT
to digital
CVBS
encoder
SHIFTING
CLIPPING
CHROMA
UP-CONVERSION
MPEG
decoded
picture
MGD331
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PDF描述 |
|---|---|
| SAA7201H | Integrated MPEG2 AVG decoder |
| SAA7212 | Integrated MPEG2 AVG Decoder(綜合MPEG音頻視頻圖表譯碼器) |
| SAA7212H | Integrated MPEG AVG decoder |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| SAA7201H | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Integrated MPEG2 AVG decoder |
| SAA7205 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:MPEG-2 systems demultiplexer |
| SAA7205H | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:MPEG-2 systems demultiplexer |
| SAA7206 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:DVB compliant descrambler |
| SAA7206H | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:DVB compliant descrambler |
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