ATEIS IDA8 User Manual

Page 423

Components of Audio Processor

423

It means the speed of adapting the P.M. audio level depends on the ambient noise.

Paging Activity:

Lights up when the paging is active.

Decrease Zone:

Indicates that the AGC gain is decreasing.

Dead Zone:

Indicates that the AGC is not changing.

Increase Zone:

Indicates that the AGC gain is increasing.

Fast Increase Zone:

Indicates that the AGC gain is increasing fast.

Sensing Mic Level:

Shows the input level of the sensing microphone.

C/Sensing Mic Level:

Shows the input level of the sensing microphone through the internal calibration transfer
function.

Output Level:

Shows the output level.

Differential Level:

Difference between the Output level and the C/Sensing Mic level.

Process to set the A.N.G.:

1. Connect the sensing microphone to the S.M. input, and the paging audio source to the P.M.

input. The NSM sensing microphone needs an input sensitivity of 0dB (software). The max cable
length between the NSM and the audio processor is 500 meter (152 ft) with CAT-5 cable.

2. Link the output of the ANG component to an Output component where it is connected to a

loudspeaker.

3. Click on the Calibrate button to start the calibration process. The system will start to estimate the

acoustic transfer function between loudspeakers and microphone when the user clicks the
Calibration button. It will automatically stop calibrating when the system finds a better transfer
function.

4. The calibration red LED lights up when the calibration process is running. During the process,

don't move the physical installation, and don't make punctual noise. The calibration must be done
in normal ambient conditions.

5. Wait until the calibration is finished. The red calibration LED light will turn off and the green

calibration LED will light up as shown in the picture below: