Matrox Orion Installation And Hardware Reference page 34

34 Chapter 5: Matrox Orion hardware reference
Phase-locked loop
Sampling Rates for NTSC/PAL Standards
Video format
NTSC
PAL
The video decoder also features an automatic gain control
(AGC). However, you can disable this feature (MIL-Lite
MdigControl() with
) and adjust the gain manually (MdigControl() with
M_DISABLE
M_GRAB_INPUT_GAIN
The decoder incorporates a phase-locked loop (PLL), and
outputs a clock signal at three frequencies. When analog data
passes through the decoder, the sync signals are extracted by
the PLL. The clock signals that exit the decoder depend on the
type of analog signal and the resolution. The signal type, the
generated clock frequencies, and display resolution are
described in the table below:
CCIR-601
Signal type NTSC
Clock 27.0 MHz 27.0 MHz 24.54 MHz
Frequency
Resolution 720 x 480 720 x 576 640 x 480
Active Pixels 720
Active Lines 480
Square Pixels
12.27 MHz
(640x480)
14.75 MHz
(768x576)
M_GRAB_AUTOMATIC_INPUT_GAIN
).
Square Pixels
PAL NTSC
720 640
576 480
CCIR-601
13.5 MHz (720x480)
13.5 MHz (720x576)
set to
PAL
29.5 MHz
768 x 576
768
576