Audio Matrixing - Polycom EF2201 Brochure & Specs

1
One of the most important features of the Vortex is the full bandwidth full cross point matrix. Not just a router, the Vortex's full
matrix allows audio from any input to be changed in gain and mapped to any output. No longer do you have to be constrained with
using a sub-bus to change the gain of groups of input signals. The Vortex now makes it possible to have arbitrary gains on every
cross point - any combination of inputs to outputs is now possible. Any input signal can be mapped to an output by applying a
cross point (in dB) and unmuting the cross point. For instance to map input 1 to output A with 6 dB of attenuation, you would put a
–6 in the Row 1, Column A cell. To map inputs 1-8 to output A with 6 dB of attenuation you would put a –6 in Rows 1-8, Column A
cells. It is that easy! The cross points can be changed via RS-232, the LCD front panel, or through presets and macros activated by
contact closures.
To explore the matrix further, let's start with reviewing the inputs and outputs.
Inputs
The inputs to the matrix are 8 Microphone/Line inputs (1-8), 4 line inputs (A-D), a signal generator (white noise, pink noise, and
sinusoids), and the 14 outputs of the EF Bus mix-minus sub-matrix (P
Z 1, Z 2) for a total of 27 inputs. Don't worry, the EF Bus cross point mix-minus sub-matrix is described in Section 17: Linking
M M
Multiple Devices.
Mic/Line Inputs
The microphone/line inputs (1-8) to the matrix are the outputs of the processing block shown in Figure 11 -- the signal is echo
cancelled, noise cancelled, automatic gain controlled, filtered, and has passed through the automixer. Both the gated and ungated
signals can be used in the matrix. For example input 1 could be sent directly to output 1 as an ungated signal (for example a direct
output used in a court system) and it can be used as part of output A as a gated signal (to be sent to a codec).
Level
Phantom
adjust
-
Mic/Line
Figure 13. Input 1-8 signal path to the matrix.
26
0
1 0
A
A
Echo
A/D
Canceller
Ref 1 or Ref 2
Input
AGC
Filters
On Off
Parameters
M
M
U D I O A T R I X
U D I O A T R I X
0, P 1, W 0, W 1, W 2, X
M M M M M
Noise
Canceller
Parameters
Mute Gate
On Off
Parameters
I N G
I N G
0, X 1, X 2, Y 0, Y 1, Y 2, Z
M M M M M M
Matrix
0,
M