參數(shù)資料
型號: TW9903
廠商: Electronic Theatre Controls, Inc.
英文描述: TW9903 ? Multi-standard Video Decoder With High Quality Down Scaler
中文描述: TW9903?多標(biāo)準(zhǔn)視頻解碼器,高品質(zhì)下倍線器
文件頁數(shù): 23/74頁
文件大?。?/td> 630K
代理商: TW9903
TW9903
TECHWELL, INC.
23
REV. 0.92 ( B )
06/02/2002
HDELAY + HACTIVE < Total number of pixels per line.
For NTSC output at 13.5 MHz pixel rate, the total number of pixels is 858. The HDELAY should be
set to 106 and HACTIVE set to 720. For PAL output at 13.5 MHz rate, the total number of pixels is
864. The HDELAY should be set to 108 and HACTIVE set to 720.
The Vertical delay register (VDELAY) determines the number of lines delay between the leading
edge of the VSYNC and the start of the active video lines. It indicates number of lines to skip at the
start of a frame before asserting the VACTIVE signal. This value is referenced to the incoming
scan lines before the vertical scaling. The number of scan lines is 525 for the 60Hz systems and
625 for the 50Hz systems. The Vertical active register (VACTIVE) determines the number of lines
to be used in the vertical scaling. Therefore, the number of scan lines output is equal or less than
the value set in this register depending on the vertical scaling ratio. In order for the vertical cropping
to work properly, the following equation should be observed.
VDELAY + VACTIVE < Total number of lines per field
Table 4 shows some popular video formats and its recommended register settings. The CCIR601
format refers to the sampling rate of 13.5 MHz. The SQ format for 60 Hz system refers to the
sampling rate of 12.27 MHz, and the SQ format for 50 Hz system refers to the use of sampling rate
of 14.75 MHz.
Scaling Ratio
Format
Total
Resolution
Output
Resolution
HSCALE
values
VSCALE
(frame)
1:1
NTSC SQ
NTSC CCIR601
PAL SQ
PAL CCIR601
NTSC SQ
NTSC CCIR601
PAL SQ
PAL CCIR601
NTSC SQ
NTSC CCIR601
PAL SQ
PAL CCIR601
780x525
858x525
944x625
864x625
390x262
429x262
472x312
432x312
195x131
214x131
236x156
216x156
640x480
720x480
768x576
720x576
320x240
360x240
384x288
360x288
160x120
180x120
192x144
180x144
0x0100
0x0100
0x0100
0x0100
0x0200
0x0200
0x0200
0x0200
0x0400
0x0400
0x0400
0x0400
0x0100
0x0100
0x0100
0x0100
0x0200
0x0200
0x0200
0x0200
0x0400
0x0400
0x0400
0x0400
2:1 (CIF)
4:1 (QCIF)
Table 4. HSCALE and VSCALE value for some popular video formats.
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