Specifications

34 Chapter 5: Matrox Orion hardware reference
The video decoder also features an automatic gain control
(AGC). However, you can disable this feature (MIL-Lite
MdigControl() with
M_GRAB_AUTOMATIC_INPUT_GAIN set to
M_DISABLE) and adjust the gain manually (MdigControl() with
M_GRAB_INPUT_GAIN).
Phase-locked loop 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:
Sampling Rates for NTSC/PAL Standards
Video format Square Pixels CCIR-601
NTSC 12.27 MHz
(640x480)
13.5 MHz (720x480)
PAL 14.75 MHz
(768x576)
13.5 MHz (720x576)
CCIR-601 Square Pixels
Signal type NTSC PAL NTSC PAL
Clock
Frequency
27.0 MHz 27.0 MHz 24.54 MHz 29.5 MHz
Resolution 720 x 480 720 x 576 640 x 480 768 x 576
Active Pixels 720 720 640 768
Active Lines 480 576 480 576