User manual

ADC-8032B Timing Mode Features
• Line Delay and Line Sync timing modes
• Two lines of memory
• Can be timed within one line in 37ns increments
• Can be field-upgraded to the Frame Sync version
ADC-8032B-S Timing Mode Features
• Frame Delay and Frame Sync as well as Line Delay and Line Sync timing modes
• One frame of memory
• Can be timed within one frame in 37ns increments
Both versions of the ADC-8032B offer a tracking delay output that pulses high at frame rate on
BNC 6. The pulse width is a measurement of the video delay through the card. This is useful when
connecting with devices which accept this type of measurement signal (such as the RossGear ADL-
8520 AES Audio Delay Unit). On both versions, the fine phase potentiometer (RV2) is provided for
sub-pixel adjustment.
Line Delay (ADC-8032B & ADC-8032B-S)
Line Delay mode uses the input signal to generate the output timing. There is a constant delay
between the input and the output. The external reference is not used in any way. This is useful in
applications where a constant delay through the card is required.
The delay through the card has a minimum value, as described in Chapter 7, “Specifications”. Output
timing can be adjusted from this minimum delay up to an additional two lines in sub-pixel increments.
Line Sync (ADC-8032B & ADC-8032B-S)
Line Sync mode uses the external reference to generate the output timing on a line-by-line basis, but
uses the input signal timing to decide when a frame begins.
Whenever a signal is received, the output-timing generator waits for the next falling edge of H Sync
on the external reference before displaying the incoming line. The advantage of this mode is that as
long as all input sources are timed to be on the same line, the output timing stays constant, regardless
of which input is selected. This is very useful in that all sources to the ADC-8032B (for example,
from a routing switcher) only need to be lined up to the same line.
The Line Sync mode has internal latency, so that using minimum delay still means that the output
video will not be lined up with the external reference. To do so would have added even more latency,
which would not be desirable. However, output timing can be delayed by up to two lines from the
minimum delay point on, in sub-pixel increments, so that the output video can be lined up as required.
Note
If two input sources are not on the same line, then switching
from one source to the other causes a jump in the output timing
by an exact number of lines. For example, if the two sources
are 2.5 lines apart, the output will jump by either 2 or 3 lines
depending on the position of the sources with respect to the
external reference.
ADC-8032B User Manual (Iss. 02B) Using Banks • 4-15