Polycom EF2201 Application Note page 21

Table 1. The zone matrix report for the design example.
Zone Mic
Zone 1 Table Mic 1
Table Mic 2
Table Mic 3
Table Mic 4
Zone 2 Table Mic 5
Table Mic 6
Table Mic 7
Table Mic 8
Zone 3 Table Mic 9
Table Mic 10
Table Mic 11
Table Mic 12
Presenter Lectern Mic
Wireless Mic 1
Wireless Mic 2
In addition to the zone matrix report, Table 2 shows a part of the zone routing
spreadsheet illustrating how the Zone 1 loudspeaker output is created from
microphone signals, codec, and phone add audio.
In this example, the Zone 1 output is built from the Zone 3 microphones
(attenuated 12dB), the telephone from the EF2201, the Zone 2 microphones
(attenuated by 18dB), the presenter microphones (attenuated by 8dB), and the
VSX 8000 video codec audio.
The report in Table 2 also shows the details on how the signals are bussed – for
instance the presenter microphones are transmitted on the X bus from EF2280:01
and input to EF2280:00 on input XB1, attenuated by 18dB and then fed into the
main matrix of EF2280:00 and summed together with the other signals to create
the Zone 1 loudspeaker output.
Device
Output
Zone
Device
EF2280:00
EF2280:00
EF2280:00
EF2280:00
EF2280:01
EF2280:01
EF2280:01
EF2280:01
EF2280:00
EF2280:00
EF2280:00
EF2280:00
EF2280:01
EF2280:01
EF2280:01
EF2280:00 EF2280:01 EF2280:00
1 1
Zone 1 Zone 2
-- -18
-- -18
-- -18
-18
--
-18 --
-18 --
-18 --
-18 --
-12 -18
-12 -18
-12 -18
-12 -18
-18 -12
-18 -12
-18 -12
2
Zone 3
-12
-12
-12
-12
-18
-18
-18
-18
--
--
--
--
-12
-12
-12
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