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Net-2000™ VCU Users Manual

Version 4.0, December, 2013

IP Mode

VAD is av

ailable with the following vocoders:

Vocoder

AMBE®

AMBE+™

AMBE+2™

APCO Enhanced

GMR-1

GMR-2

BGAN Vocoder (Always ON)

GMR-2+ Vocoder (Always ON)

Note: The VAD is always enabled when BGAN or GMR-2+ is selected as the vocoder type.

4.9.2 Tone Detector

The Tone detector can be turned on or off is selected using the checkbox. When the Tone detector in enabled the

Net-2000™ VCU is able to send and receive North American DTMF tones.

Tone Detection is available with the following vocoders:

Vocoder

AMBE® (Always ON)

AMBE+™ (Always ON)

AMBE+2™

APCO Enhanced

GMR-1

GMR-2

BGAN Vocoder

GMR-2+ Vocoder

Note: The Tone detector is always enabled when AMBE®/AMBE+™ is selected as the vocoder type.

4.9.3 Noise Suppressor

The Noise suppressor feature of the Net-2000™ VCU provides clear voice in environments with background noise.

This feature work only when one of the vocoders indicated below is selected as the vocoder type. To enable the

feature select the check box in the Configuration table on the VOIP page. The noise suppressor can be switched off

by unchecking the check-box. When the noise suppressor is started it may take up to a few seconds to converge

allowing for it do begin fully working.

Noise Suppression is available with the following vocoders:

Vocoder

AMBE+2™

APCO Enhanced

BGAN Vocoder

GMR-2+ Vocoder

4.9.4 Echo Canceller (Echo)

The AMBE® software on the NET-2000™-VCU employs an adaptive echo cancellation algorithm to cancel echoes

of the decoder output present at the encoder input. This provides a 16-millisecond echo canceller that is suitable for

canceling the linear portion of the local echo caused by a 2-to-4 wire hybrid and can achieve echo cancellation of

approximately 30dB or more. The Echo canceller is only really useful when connected via the 2-wire interface.

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