Sierra Video Yosemite - Manual (Page 33)

AUDIO OVERVIEW
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Analog Audio Signal Path Overview
The Yosemite Family audio routing switcher signal path consists of two modules: an input buffer, and a
combination crosspoint module / output driver module. The same two modules are used for both frame
sizes: 64x64 and 128x128.
Input Buffers
Each input buffer module has 32 identical circuits. Yosemite routers are designed to work in broadcast
and production facilities, and are compatible with balanced interconnections.
The buffers have multiple purposes:
1. Present a high impedance to the incoming signal
2. Remove unwanted common mode IE Hum signal
3. Convert the signal to the level and impedance needed by the
switching matrix that follows
The output of the input buffer circuits are connected to the switching matrix via the internal motherboard.
Unlike their analog video counterparts, the input buffers are internally mounted. The 64x64 frame has
positions for two 32-channel buffer modules; and the 128x128 frame has positions for four 32-channel
buffer modules.