Grass Valley 8960DEC - Manual (Page 46)

46 8960DEC—Instruction Manual
Functional Description
Three-line Adaptive Comb Decoder
The Decoder accepts the 27 MHz oversampled NTSC/PAL composite
video signal and generates the decoded Luma and Chroma signals using
2-D adaptive comb filtering. This technology gives better performance than
standard comb filtering for moving pictures without using external
memory. The output signal complies with digital video standards
CCIR-601 and SMPTE-259 at the 27 MHz output clock frequency. All the
necessary timing and interfacing signals are generated internally and for
the selected incoming signal’s standard.
Synchronizer/Output Driver
With the addition of the optional frame synchronizer module, the Data
Switch routes the video through the module and the phasing range
becomes infinite. The frame synchronizer is locked to the selected reference
in the horizontal and vertical domain in 37 ns steps that are overlapped
with a fine phase adjustment. The driver section embeds the EDH data and
delivers four SMPTE-259 standard outputs.
References
If the frame sync submodule is present, independent 525/625 reference
inputs are automatically selected according to last valid video input stan-
dard.
Microcontroller
Upon power up, the microcontroller configures the decoder chip and loads
the firmware according to the last stored user adjustments. The user adjust-
able parameters are input through a of multi-function rotary and paddle
switch interface with an option to recall factory presets.
Frame Communication
All functions are remote read/write through the frame control interface
(available in Gecko 8900TX/TF/TFN frames). The fault reporting output is
connected to the frame controller through the frame motherboard.