DSP Components 349
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8. Restart the calibration process until the both Over/Under LED are OFF.
The A.N.G. is still adjusting the AGC level with the ambient noise to be ready for paging if though
the paging is not activated.
The calibration should be done in normal ambient noise. There should be no sudden loud noise
during the calibration.
Do not adjust the gain of output, amplifier or sensing microphone during or after the calibration.
You can adjust the volume of the audio source connected to the P.M. input.
Theoretically, when the calibration has finished, the AGC level will be stable around 0 dB in an
environment of no increasing noise. However, every calibration might have a deviation. If the AGC
level is not stable around 0dB, users could adjust the gain of the output function, amplifier or
sensing microphone to let the AGC level stable around 0 dB.
After the calibration is successful, the paging microphone shouldn't be placed near the sensing
microphone because the user's voice will also be received by the sensing microphone.
The AGC level will still be calculated even it's not activated.
Use the A.N.G.
If the [Calibration] LED lights up in green indicates the system is ready.
If the A.N.G. has detected an ambient noise average of -12dB, choose a medium [Response
Speed] and a short [Sampling Time] in order to adequately react quickly.
The A.N.G. will automatically adjust the level on the P.M. signal depending on the ambient noise
detected from the NSM microphone. The A.N.G. works when an audio signal is detected on the P.
M. input and [Paging Activity] LED will light up.
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