參數(shù)資料
型號: TVP5031CPFP
廠商: Texas Instruments, Inc.
英文描述: Color Decoder Circuit
中文描述: 彩色解碼器電路
文件頁數(shù): 20/85頁
文件大小: 378K
代理商: TVP5031CPFP
2–4
2.2.1
Decimation Filter
Digitized composite video at 2x PCLK rate first passes through the decimation filter that reduces the data rate from
2x to 1x PCLK. The decimation filter is a half-band filter whose frequency response is shown in Figure 2–3. For
applications that cannot tolerate high frequency rolloff, the decimation filter can be bypassed the host port. 2x
oversampling and decimation filtering can effectively increase the overall signal-to-noise ratio by 3 dB. This
advantage is lost if decimation filtering is bypassed.
f – Frequency – MHz
–60
–50
–40
–30
–20
–10
0
10
0
1
2
3
4
5
6
7
8
PAL SQP –3 dB at 6.66 MHz
CCIR 601 –3 dB at 6.10 MHz
NTSC SQP –3 dB at 5.54 MHz
A
Figure 2–3. Decimation Filter Frequency Response
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