Linear Acoustic LA-5448, User Manual

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Linear Acoustic LA-5448 AC-3 Frame Synchronizer/Rate Shaper User Guide Applications
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Figure 3-2
LA-5448 processing three separate streams, rate shaping enabled.
Figure 3.2 shows multiple AC-3 sources being frame synchronized to a local plant
reference as well as being rate shaped to a constant 448 kbps output data rate. Also
shown is a “crash switch” between two AC-3 sources that will be cleaned up and kept
at a constant data rate by the LA-5448. This is useful for commercial insertion appli-
cations.
M ultiplexer
A C -3
448 kbps
Local 48 kH z AES R ef
(AC -3 or PC M )
Satellite
AC -3 192 kbps
A C-3
384 kbps
448
kbps
448
kbps
448
kbps
X
Synchronized to Local
Reference, fixed at 448 kbps
VTR /Server
A C-3
384 kbps
A C-3 384/448 kbps