GRASS VALLEY 8960ENC -, Инструкция по эксплуатации

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8960ENC Instruction Manual 43
Functional Description
Cross-Color Remover
The encoder accepts 525/625 component video and before the composite
encoding, removes luminance components that could cause discoloration
in high detail diagonal content areas. By doing this at the decoder side,
there are no artifacts when using digital comb filtering based decoders such
as the 8960DEC Adaptive Decoder. The pre-filtering is done in a Field Pro-
grammable Gate Array (FPGA) using a spatio-temporal comb filter that
gives full vertical resolution while removing all unwanted cross-color
details. All the necessary timing and interfacing signals are generated inter-
nally and adjusted automatically to the incoming signal’s standard.
Synchronizer
Phasing range is infinite with the addition of the optional frame synchro-
nizer module. The frame synchronizer is locked to the selected reference in
the horizontal and vertical domain in 37 ns steps.
10-bit Encoder and Output Driver
The 10-bit precision encoder can be switched through auto/manual stan-
dard selection to multi-standard outputs:
• NTSC
• PAL-B
• PAL-M
Fine phase adjustment is available within a 0-45 ns range.
The oversampling restoration filter gives an exceptionally flat response and
a linear phase signal that is amplified and automatically DC-restored
before it is output to the four BNC connectors.
Color-frame Lock
When the Lock Source is set to Reference (factory default configuration),
the composite output video is automatically color-frame locked when a
blackburst reference signal is present. The composite analog video output
signal and the reference have to be frequency-locked and the phase differ-
ence has to be within ±10 video lines for color-frame locking.
If during module configuration Lock Source is set to Video, color-frame
lock is free-running. If the output signal is PAL-M encoded, the board locks
to NTSC reference signal.