Manual Polycom Vortex EF2201 (page 12 of 85) (English)

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The EF2201 has only one physical input. This input comes from the telephone interface, and is labeled

T. The T input has signal processing which includes the following algorithms: Line Echo Cancellation,

Noise Cancellation, and AGC.

Vortex devices can be linked together so that they can share control information and digital audio

signals. The audio signals are shared on four digital busses labeled P, W, X, Y, and Z. All Vortex devices

can receive signals from all of these busses. Only certain devices can transmit on the busses. This

information is given in the following table.

Device Transmit on P Bus

Transmit on W, X, Y, Z

Busses

Receive P Bus

Receive W, X, Y, Z

Busses

EF2280 No Yes Yes Yes

EF2241 Yes Yes Yes Yes

EF2211 Yes Yes Yes Yes

EF2210 No Yes Yes Yes

EF2201 Yes No Yes Yes

The P bus is meant for routing telephone audio between the devices. The W, X, Y, and Z busses are

meant for routing microphone and auxiliary audio between the devices. The W, X, Y, and Z busses also

carry NOM (Number of Open Microphones) information from the automixer so that outputs created

from these busses can be appropriately attenuated for the number of open microphones.

The digital inputs consist of all of the signals placed on the EF Bus by the other connected Vortex

devices. Each P, W, X, Y, and Z bus can carry channels from up to eight other devices, so we have the

following digital inputs to each Vortex device: PB0-PB7, WB0-WB7, XB0-XB7, YB0-YB7, and ZB0-ZB7.

The inputs are designated by three characters: the bus letter (P, W, X, Y, or Z), a B indicating that it is

a bus input, and a number between 0 and 7 indicating the channel of the bus.

There is also an internal signal generator, labeled SG, that is capable of producing white or pink noise.

this signal is fed into the matrix so that it can be routed to the appropriate outputs for calibration or

testing.

The mixing capabilities of the Vortex devices can be broken down into two parts: the EF Bus

submatrices and the main matrix.

For each of the W, X, Y, and Z signal busses, there is a 8 x 3 matrix that allows the user to define up to

three mixes of each of the four signal busses. The inputs and outputs for the 8 x 3 matrices are as

follows.

W Submatrix

● Inputs: WB0-WB7

● Outputs: WM0-WM2

X Submatrix

● Inputs: XB0-XB7

● Outputs: XM0-XM2

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Polycom Vortex EF2201 Manual

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