User manual

In Frame Sync, the output timing will be undisturbed as it is based on the external reference. In Line
Sync mode, as long as the input sources are on the same line relative to the external reference, and
they do not cross the threshold point (see Bank C-1 Timing Mode for details on the threshold point),
then the output timing will also be undisturbed. In all other cases, the output timing will be disturbed
any time an untimed switch is made at the input of the ADC-8032B. This function sets the mode or
disables it. Three choices are available:
• Off - disables the Hotswitch Mode.
• Black - the output momentarily cuts to black when an untimed switch is made at the
input.
• Freeze - (ADC-8032B-S only) the last valid image is momentarily frozen. The
freeze will affect either field 1, field 2 or the entire frame (as determined by the
Freeze Mode function).
In either case, the output returns once the card has resynchronized to the input. Use the following
steps to set the Hotswitch Mode:
1. Select Bank C, and rotate Function Select to position B.
2. Select the desired mode according to the table below:
• Toggle Mode Select up to advance up the list.
• Toggle Mode Select down to descend down the list.
Bank Function Select Mode Select Heads-Up Display Label Default
C B
+ Freeze
Black
- Off
HOTSW MD FREEZE
BLACK
OFF
OFF
Note
Freeze hotswitching is not supported in Line Delay, Line Sync and
Frame Delay timing modes. If one of these timing modes is
selected and freeze hotswitching is enabled, the hotswitch will go to
black instead.
Important
Because output timing is disrupted in Line Delay and Frame Delay
modes, hotswitching is not guaranteed to go completely black.
These two timing modes should never be used if the input source is
switched while on air, since the output timing will be affected, and
this could affect equipment downstream of the ADC-8032B.
Important
It is recommended that the Hotswitch Mode and Input Loss Mode
be set the same with either: both set to freeze, or both set to black.
There is circuitry in the sync stripper that removes unwanted
impulses to make the circuit more noise tolerant. During a
hotswitch, this could cause the ADC-8032B to interpret the signal
has been lost. Since the Input Loss mode overrides the Hotswitch
mode setting, having one set to freeze and the other set to black
could lead to a momentary glitch on the output.
Important
Time-based error-prone signals such as from a VTR will falsely
trigger the hotswitch. Thus if the Input Mode is set to VTR it
forces the Hotswitch Mode to OFF.
ADC-8032B User Manual (Iss. 02B) Using Banks • 4-23