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参数资料
| 型号： | IBM39MPEGS420PBA18C |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PBGA352 |
| 封装： | 35 X 35 MM, 2 MM HEIGHT, 1.27 MM PITCH, PLASTIC, BGA-352 |
| 文件页数： | 8/25页 |
| 文件大小： | 112K |
| 代理商： | IBM39MPEGS420PBA18C |
IBM39MPEGS42x
IBM39MPEGSI
MPEG S422, MPEG S420 and MPEG SI Encoders
SI Encoder Operations/Features
16 of 25
Sseries_sds_071701.fm.02
July 17, 2001
4:2:2 to 4:2:0 Chroma Conversion Operation
Input video data can be in either the 4:2:2 or 4:2:0 format. The encoded output format can also be 4:2:2 or 4:2:0.
Valid combinations of these formats in and out of the encoder are shown in Table . When the video source format is
4:2:2 and the encoded output format is 4:2:0, a conversion from 4:2:2 to 4:2:0 will need to be done. The encoder
can internally perform the 4:2:2 to 4:2:0 conversion.
The encoder supports four chroma conversion modes. Host Register X’04’ bits 4-3 are used to select the chroma
conversion mode. The choices are:
frame convert, eld convert, drop eld and output convert. An on-chip 2 tap
lter is used in each conversion mode. The contents of Host Register X’04’ bits 4-3 remain effective until changed
by the user. This register may be changed on any input picture boundary, during input picture gaps. The encoder
allows this parameter to be dynamically changed while encoding is in progress. If a change to this parameter is
processed between elds of a given input frame, the result is unpredictable. There is no internal provision to
prevent this register from being changed between a pair of odd/even elds that make up a frame. In all conversion
modes, except
drop eld, the lter coefcients are 1/2.
Two adjacent vertical frame pixels are used to produce one chroma pixel in
frame convert mode.
Two adjacent vertical pixels of the same eld are used to produce one chroma pixel in
eld convert mode.
The chroma data in the even eld is dropped, and the chroma data in the odd eld is used for the entire picture in
drop eld mode.
Field convert mode is used for eld encoding and frame convert mode is used for frame encoding in the output
convert mode.
If the user requires a more accurate lter (i.e. a long tap lter), then it is recommended that an external conversion
method be used.
Maximum Video Resolution
4:2:0
Luminance
4:2:0
Chrominance
4:2:2
Luminance
4:2:2
Chrominance
NTSC
60fps (1)
720x256
360x128
720x256
360x256
NTSC
30Fps (2)
720x512
360x256
720x512
360x512
PAL
50fps (1)
720x304
360x152
720x304
360x304
PAL
25Fps (2)
720x608
360x304
720x608
360x608
Note: (1) fps = elds per second (2) Fps = frames per second
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IBM39MPEGS422PBA17C | 制造商:IBM 功能描述: 制造商:IBM 功能描述:Video/TV Circuit, Video PROCESSING/ENDEC FOR MPEG, 352 Pin, Plastic, BGA |
| IBM39MPEGSE10CFB18C | 制造商:IBM 功能描述: |
| IBM39MPEGSE20CFB18C | 制造商:IBM 功能描述: |
| IBM39MPEGSE30CFB18C | 制造商:IBM 功能描述: |
| IBM39MPEGSIPBA18C | 制造商:未知厂家 制造商全称:未知厂家 功能描述: |
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