Ensemble Designs 7550 HD Legalizer - Manual (Page 8)

Configuration Summary
This section provides a general overview of the configuration for the 7550 module. The
controls available for configuration with remote control are summarized and tips and
examples are given for using particular controls to achieve the best results.
Video Processing
The 7550 has a full-featured Proc Amp for adjustment of every signal parameter. Proc
controls adjust the overall video signal. A Legalizer menu allows adjustment of black and
white clips to prevent excessive signal excursions or the output can be set to meet default
RGB values determined on a pixel by pixel basis.
The available video/color processing and video timing and output remote control menus
are summarized below:
• Proc: Video Gain, Chroma, Pedestal and Hue are standard Proc Amp controls
affecting the entire signal. The Hue control gives phase rotation of the color vectors
in the manner of an NTSC composite Proc Amp.
• Clip: The Clip menu provides enabling of a Legalizer which insures signal levels
will not exceed those permitted in the composite domain. Thus its use can insure a
television transmitter will not be presented illegal video input. If set to Off or set
for Legal RGB, adjustments are grayed out and may not be changed. When set to
Y, Cr, Cb, controls for black and white clipping and chroma limiting are provided.
• Timing: The 7550’s comprehensive range of timing allows complete flexibility in
placement of the output picture relative to the applied reference input. A Frame
Synchronizer can be enabled to allow timing the signal to an external house
reference. Frame Delay can be set for up to three frames of delay.
• Video Out: The Bypass selection takes the 7550 Proc Amp out of the video path by
routing the signal around it to the output. One of four internally generated test
signals may be selected to be sent to the output signal if needed. Embedded Audio
is removed from the SDI stream when Strip is selected in the Strip Audio window.
There are Wide, and Narrow vertical blanking choices. Wide gives blanking
through line 20 (NTSC) or line 22 (PAL), while narrow produces blanking through
line 9 (NTSC) or Line 6 (PAL) of both fields.
• 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.
• Memory: Up to five configurations of the 7550 may be saved into memory
registers for later recall. All parameters – gains, input format, filters, blanking,
etc. – and are saved in each memory. The 7550 can be used with the 8415
submodule for audio disembedding, channel swapping and re-embedding in a par-
ticular application. In another application other audio parameters can be adjusted
for a particular configuration. These two setups could be stored in memory
registers and one or the other recalled for instant restoration of the required con-
figuration.
7550-8
Model 7550 HD Video Proc Frame Sync