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參數資料
| 型號： | W9961CF |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | 消費家電 |
| 英文描述： | H.263/H.261 Video Codec |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP208 |
| 封裝： | 28 X 28 MM, 2.60 MM HEIGHT, PLASTIC, QFP-208 |
| 文件頁數： | 25/65頁 |
| 文件大?。?/td> | 344K |
| 代理商： | W9961CF |
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W9961CF
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Figure 5.1 shows an example system diagram for an H.324-compliant stand-alone videophone.
For live video input, a digital camera, or an NTSC/PAL camera connected to a TV decoder, is fed into
the W9961CF in YCbCr 4:2:2 format through 16- or 8-bit data bus. The input video is cropped and
scaled to sub-QCIF, QCIF, or CIF format as the local view video. The W9961CF compresses the
local view video according to H.263 for H.324 (or H.261 for H.320) and the resultant compressed
video stream is transferred and multiplexed with compressed audio stream by the W90220CF. Then
the W90220CF performs multiplex/control according to H.223/H.245 for H.324 (or H.221/H.242/H.230
for H.320) and transmits the bit stream to the PSTN through V.34/V.80 modem for H.324 (or ISDN
network for H.320).
For the receipt of combined video/audio from the remote end, the H.324-compliant (or H.320-
compliant) bit stream enters the system through a V.34/V.80 modem for H.324 (or ISDN circuit for
H.320), where the W90220CF performs demultiplex/control and separates the stream into two
compressed streams. The W9961CF decompresses the video stream according to H.263 for H.324
(or H.261 for H.320) and produces the remote view video. The decompressed remote view video
and/or the local view video can be overlaid with graphical background or on-screen-display (OSD)
and output to LCD (in NTSC/PAL composite video or RGB format), TV (in NTSC/PAL composite
video or S-Video format), or monitor (in RGB format). The W9961CF can also performs post
deblocking filtering to reduce artifacts caused by compression/decompression for the remote view
video, and the local view video can be mirrored or unmirrored.
For audio processing, the near-end audio is compressed and the remote-end audio stream is
decompressed by the W90220CF according to G.723.1 for H.324 (or G.711/G.722/G.728 for H.320).
The W90220CF also performs Acoustical Echo Cancellation (AEC) between the speaker and
microphone to prevent howling. A/D conversion for microphone or handset transmitter input, and D/A
conversion to drive the speaker and/or handset receiver are performed by the Audio Codec.
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