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STW8019 数据表(PDF) 12 Page - STMicroelectronics |
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STW8019 数据表(HTML) 12 Page - STMicroelectronics |
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12 / 55 page  Functional description STw8009/STw8019 12/55 Figure 6. Luma filtering with 3.58 MHz trap Figure 7. Luma filtering with 4.43 MHz trap 4.7 Chrominance encoding Chroma components are computed from demultiplexed Cb, Cr samples. Before modulating the subcarrier, the chroma components are band-limited and interpolated at pixel clock rate. A set of 4 different filters is available for chroma filtering to suit a wide variety of applications in the different standards and filters recommended by ITU-R 624-4 and SMPTE170-M. The available –3dB bandwidths are 1.1, 1.3, 1.6 and 1.9 MHz. Narrow bandwidths are useful against cross-luminance artifacts while wide bandwidths allow to keep higher chroma contents. Frequency (MHz) Frequency (MHz) |
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