VT1621M VIA, VT1621M Datasheet - Page 35

• Manufacturer Part Number: VT1621M
• Description: TV Encoder
• Manufacturer: VIA

Filters
The Y components are low-pass filtered, upsampled and low-
pass filtered again (for removing the image of upsampling)
with a filter response illustrated in Figure 19.
components also have the same operations; the filter response
is illustrated in Figure 20. The pixel clock is different for each
display mode.
Revision 1.0 June 17, 2002
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Therefore, the filter coefficients should be
Figure 19. Luminance Lowpass Filter Response (27 MHz)
The UV
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different for each mode so that the TV Encoder can generate a
high quality TV image.
programmed through the serial bus interface to provide a
controllable bandwidth output on both composite and S-video
signals.
VT1621 / VT1621M TV Encoder
All the filter coefficients are
Functional Descriptions