Ensemble Designs 8500 Composite / SD Legalizer and Video Processing Frame Sync User Manual
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8500-15
Model 8500 Series Modules
A Detail Enhancer recovers information that has been lost due to poor frequency response
in upstream systems.
Selective (toothed) vertical blanking lets you choose to pass or strip content in the vertical
interval on a line by line and field by field basis.
The 8500 has simultaneous SDI and analog composite outputs. They are fully timed to
your house reference, including the subcarrier and ScH phase of the composite output.
The analog output is constructed at 8x oversampling with 12 bits of quantizing resolution.
The available video processing remote control menus are summarized below:
•
Proc Menu: Gain, Chroma, Pedestal and Hue are standard Proc Amp controls.
Whether operating with SDI or analog inputs or outputs the Hue control gives
phase rotation of the color vectors in the manner of an NTSC composite Proc Amp.
•
Clip: The Legalizer is a predictive clipper which insures signal levels will not
exceed those permitted in the composite domain. Thus its use can insure a televi-
sion transmitter will not be presented illegal video input. If Off or Legal are
selected other adjustments are grayed and may not be changed. While Legal auto-
matically puts in values to insure signals will not exceed composite legal limits,
selecting Custom allows the operator to insert a range of clip values.
•
Filters: The Lum Sharp and Chr Sharp settings allow shaping of the passband for
reduced or added sharpness. With both selections set to Off or Normal there is no
modification of the video. Bandwidth reduction can be useful in reducing artifacts
when using the 8500 for preprocessing of signals which will receive MPEG com-
pression, while adding sharpness may benefit signals which arrive at the input
with reduced bandwidth.
•
Timing: The 8500’s comprehensive range of timing allows complete flexibility in
placement of the output picture relative to the applied reference input. Fine Phase
and Hor Timing take the horizontal timing across the entire line with nanosecond
accuracy. A Vert Timing adjustment completes the range in allowing any output
timing desired by the operator.
•
Status: This dynamic monitoring display provides indicators of video and audio
inputs and EDH error status. Options such as the 8510 Audio Processor and 8520
DNR show in the Option window when present.
•
Trims: Cb and Cr offsets allow black balance to be corrected while Cb and Cr
gains permit trimming of levels on these two axes. Y/C delay allows the operator to
correct inaccuracy of timing of color information relative to luminance. These trims
are functional regardless of the input or output formats in use.
•
Output: The Bypass selection takes the 8500 Proc Amp out of the video path by
routing the signal around it to output. Split mode may be used to compare input
and output signals to observe the effect of adjustments. Note that these are "live"
modes and the bypassed or split video will be fed on downstream to following
equipment. Embedded Audio is removed from the SDI stream when Strip is
selected in the Strip Audio window. Normal four field Color Lock is ordinarily used,
though other color locking modes may be selected to fit specialized needs.