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參數(shù)資料
| 型號： | VP2615 |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | H.261 Decoder(用于視頻電話和視頻會議的譯碼器（達到CCITT H261 標(biāo)準）) |
| 中文描述： | H.261標(biāo)準解碼器（用于視頻電話和視頻會議的譯碼器（達到國際電話電報諮詢委員會H261標(biāo)準）） |
| 文件頁數(shù)： | 1/11頁 |
| 文件大?。?/td> | 134K |
| 代理商： | VP2615 |
1
VP2615
H.261 Decoder
Supersedes January 1996 edition, DS3479 - 3.0
DS3479 - 4.0 June 1996
DESCRIPTION
The VP2615 decoder forms part of a chip set for use in
video conferencing and video telephony applications. It
conforms to the CCITT H261 standard, and will decode data
coded with full or quarter CIF resolution at frame rates up to 30
Hz.
It accepts run length coded coefficients which have already
been error corrected and Huffman decoded, and produces
multiplexed YUV data in macro block format after a pipeline
delay of two MacroBlocks. As shown in Figure 1, other devices
in the chip set then convert this data into full resolution,
component or composite, video.
The incoming run length coded data is converted to
individual coefficient values in the correct order. Data
reconstruction is then performed on a block by block basis by
multiplying the quantized coefficients with the original
quantization value, and then applying the inverse cosine
transform. In the inter frame mode this data is then added to
the motion compensated block from the previous frame. This
block can be passed through a low pass filter when required.
A frame store controller produces addresses which allow the
best fit block to be read from the frame store, and which also
allow the store to be updated with reconstructed data. Refresh
cycles are generated when necessary.
FEATURES
I
Inputs run length coded transform data
I
Outputs 8 bit pixels in YUV block format
I
Up to full CIF resolution and 30 Hz frame rates
I
Supports motion compensation with up to 15 pixel
movement
I
On chip frame store controller
I
100 pin QFP package
ASSOCIATED PRODUCTS
I
VP510 Colour Space Converter
I
VP520S Three Channel Video Filter
I
VP2611 Integrated H261 Encoder
I
VP2612 Video Multiplexer
I
VP2614 Video Demultiplexer
Fig 1 : Typical Video Conferencing Receiver
Y/CR/CB
FRMOUT
DATA
SYSTEM
CONTROLLER
USER
INTERFACE
H261
BIT
STREAM
RECEIVE
BUFFER
32K X 8
VP520
3 CHANNEL
VIDEO FILTER
VP2615
VIDEO
DECODER
VP2614
VIDEO DEMUX
TWO CIF
FRAME STORES
256K X 16
ADR
ADR
VP530
NTSC/PAL
ENCODER
COMP
NTSC/PAL
RLC
DATA
MACRO
BLOCK
DATA
CIF FRAME
STORE
128K X 16
R G B
OUTPUTS
VP510
COLOUR SPACE
CONVERTER
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| VP2615CGGGCR | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| VP2615CGGH1R | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:H.261 Decoder |
| VP2615CGGPFR | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
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