Exporting The Echo Canceller Reference On The, Ef Bus

DEVICE PARAMETERS

MAX NOM set to 8. To link Vortexes together, use the BUS MIXER number. Put all the Vortexes you would like to operate as one large mixer together on the same BUS MIXER number with the exception of BUS MIXER 0. If the BUS MIXER is set to 0, the Automixer will work independently from other connected Vortexes.

Each of the eight signal channels going into the automixer can be configured to be part of a particular automixer (Mixer 1 or Mixer 2). If set to NONE, it is not part of an automixer and does not affect gating decisions. The gating for each channel can be set to to FORCE ON, FORCE OFF, or AUTO.

The THRESHOLD TYPE can either be ADAPTIVE or MANUAL. The default is ADAPTIVE THRESHOLD. The ADPATIVE THRESHOLD can be set when the THRESHOLD TYPE is set to Adaptive. This represents how much louder the signal needs to be over the noise floor before the microphone should be gated on. MANUAL THRESHOLD allows you to set an absolute threshold that the signal needs to be greater than in order to gate on.

GATE PRIORITY can be configured for each microphone. Priority 1 is the highest pri- ority and Priority 4 is the lowest priority. A higher priority input takes precedence over a lower priority input if the maximum number of open microphones (Max NOM) is set to be less than the number of microphones assigned to that automixer.

EF BUS

The EF BUS page allows the user to configure how to combine the bus signals from the other linked Vortexes and control which echo canceller reference is sent to other devices as the Bus Reference. Since there can be up to 8 Vortexes linked together and each device can put 4 different signals on the bus (W, X, Y, and Z), there are 4 subma- trices to allow flexibility in how the signals from other devices get mixed together and get presented to the main matrix. Figure 11 shows the EF BUS submatrix and the fact that there are 4 submatrices and the inputs are WB0, … WB7 for the W bus, XB0, …, XB7 from the X bus, and the same for the Y and Z busses. The cross points can be changed by left clicking on the cell and adjusting the gain. Cross points can be muted by right-clicking on the cell (an unmuted crosspoint is indicated by a bolded black value; muted is indicated by a gray value). Any of the rows of the matrices can be configured as a mix-minus which allows the user to work with a simple mix-minus sum of all the other devices. If more complicated mixing from other devices is required, any of the matrix rows can have arbitrary cross points gains.