Kramer Electronics TailorMade - Manual (Page 6)

6
K R A M E R
E lectron ics
MATRIX ROUTING SWITCHER
this bus transit the stereo audio signals, and also the
power distribution and the service signals.
The cards are normalized at Euro 100x220 mm, and
can be extracted by the rear panel. Each card own
up to eight stereo plugs. There is two types of audio
cards :
-
Input audio cards.
Called WME, these cards are
idendicals beetween themselves.
The only differences are the
serigraphy of the panel and its
position in the slots.
When viewing from the rear
panel, these cards are
immediately slotted on the right
of the WMZ card (RS232
receipt). Their eight audio plugs can be set up in
factory, as balanced or unbalanced, or mixed.
Balanced mode has a +4dB level under 6 Kohms
impedance., and the unbalanced mode, -6dB under
10 Kohms. Dynamic is 12 dB. The inputs are
directly introduced into the integrated circuits, and
have no galvanic isolation.
-
Output audio cards.
Called WMS, these cards are
physically identical beetween
themselves, but have to bo
programmed for identification.
Their position is immediately on
the right of the input cards. Their
eight audio plugs have no
galvanic isolation. The output
impedance is 50 Ohms. We can
use the output in balanced mode, as in unbalanced
only without connecting the inverted pin. (Do not
connect this pin to the ground).
Up to 8 VCA (Voltage Control Amplificators) can
be wired in factory. So the audio level can be
adjusted with a special RS 232 command.
1.7 OTHERS SECTIONS
YC (S-vidéo), component YUV, and RGsB can be
realized with the analog vidéo cards, with the same
principle as RGBhv section.
1.8 RS232 RECEPTION
The card called GMOSD is the
heart of the KRAMER matrix
routing switcher. This card own
a clock generator, a
microcontroller, and provides
the service signal to the others
cards of the machine. The
reception and the treatment of
the RS232 and RS422 is made
inside and the datas are then
transfered the the concerned switchers.
As there is no keyboard on the front panel of the
matrix, the GMOSD card take on the dialog with
the external keyboard by the RS422 link.
1.9 INTERVAL SWITCHING
Switching during the black interval is basic to get a
clean change of picture, without break of the
synchronization, and cut in the middle of the
screens.
The RS232/RS422 BOARD can be provided with a
BNC connector intended to receive a video
composite signal that will act as a reference frame
for the switching of the set of video matrices.
When the reference signal is present (blackburst),
the switching takes place in the beginning of the
video frame, that is to say in the middle of the line
N°2 or 314 in PAL/SECAM (N°2 or 264 in NTSC).
The maximum waiting time is of 20 mS in PAL and
16,7 mS in NTSC. This operation can be effective
only when the sources are synchronized with the
blackburst. If this condition is not perform, then the
switch is made normally out of the interval time.