Grass Valley Acappella v.3.2.4 - Manual (Page 76)

76 Acappella — Instruction Manual
Section 4 — Software and Configuration
Test Signal Output
One of two internally generated test signal outputs may be placed on the
output with this control for troubleshooting and other purposes. The
Output Rate of the test signal must be set as 59.94Hz or 50Hz with the
Output Rate control (see
Output Rate on page 74 ).
The Test Signal Output choices are as follows:
• None – no test signal placed on the output.
• Color Bars – a 75% color bars test signal will be placed on the output at
the frame rate selected in the Output Rate control.
• Blue Screen – a 75% blue screen test signal will be placed on the output
at the frame rate selected in the Output Rate control.
Loss of Signal
The action of the output signal on loss of signal or sync can be selected from
one of the following:
• Freeze – the output video will freeze on the last good video frame.
• Pass – when sync is lost on the input signal, the signal will continue to
be passed to the output.
• Blue Screen – upon loss of signal the output video will freeze on the last
good frame and display it for one second after which a 75% blue screen
will be displayed.
Manual Freeze
A Manual freeze can be performed by the user at any time with this control.
Select one of the following to do a manual freeze:
• None – no manual freeze.
• Frame – freezes the last full frame of video (goes between Field 1 and
Field 2). This is the best choice for a progressive video signal (720p).
• Field – the recommended setting for a moving interlaced (1080i) video
freeze. Provides a cleaner image as it is not switching between fields.
Note The Field radio button will be greyed out when a progressive HD signal is
present.
Audio V-Fade
When this control is enabled, embedded audio present on the Output 1 and
Output 2 video signals will be muted during a switch between the two
video inputs eliminating any pops or clicks in the audio.