Aritech ATA-4/9 CSqX, Installation And Operation Manual

Page: 16 / 31

Installation and Operation Manual
0150-0147 2-2 Revision B
2.3 Record Mode
Time division multiplexing (TDM) combines several camera input signals into one video output signal.
Single fields are digitally captured from each of the video-input channels, and then stacked
consecutively to form a continuous video signal of time-sliced camera fields. (See the example
below.)
Captured fields are controlled by an internal Record List, which the system modifies in case of alarms,
motion detection, or video loss. A single VCR can then record the multiplexed video fields.
NOTE:
Time base correction is performed during digital capture. As a result, cameras do not
require synchronisation.
For example, three multiplexed inputs are recorded like this:
- A1 A2 A3 A4 A5 A6 A7 -
Camera A video fields
- B1 B2 B3 B4 B5 B6 B7 -
Camera B video fields
- C1 C2 C3 C4 C5 C6 C7 -
Camera C video fields
- A1 B2 C3 A4 B5 C6 A7 -
Multiplexed video stream to VCR
Record mode is activated by pressing the RECORD button, and can be locked on. Ensure that the
VCR has also been set to Record .
NOTE: This unit has an Auto-Record feature. When using the VEXT connection to the VCR, the
multiplexer will automatically return to the record mode when pulses are received from the
VCR.
While the ATA-4/9 CSqX/MSqX is recording, all the displays on the monitor are live, full-screen
displays, unless
VCR VIEW mode is selected. The user can sequence the live full-screen camera
images, or select a fixed live camera for display while recording.