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-8032A
. 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-8032A-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 synchronized 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 SW1 Function Select SW2 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-8032A
.
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-8032A
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 screen.
Important
Timebase error-prone signals such as from a VCR will falsely
trigger the hotswitch detector. Thus if the
Input Mode
is set to
VTR it forces the
Hotswitch Mode
to OFF.
ADC-8032A User Manual (Iss. 04)
Using Banks
•
4-21