AudioCodes 420HD - Configuring Noise Reduction; Figure 21-3: Web Interface - Voice - Noise Reduction; Table 21-3: Noise Reduction Parameters

Administrator's Manual 21. Configuring Voice Settings
Version 2.2.8 133 400HD Series IP Phones
21.4 Configuring Noise Reduction
The Noise Reduction feature can be configured using the Web interface.
Note: It's strongly advisable not to change the default values without consulting
AudioCodes.
 To configure Noise Reduction using the Web interface:
1. Access the Voice page (Configuration tab > Voice Over IP menu > Voice) and
then scroll down to Noise Reduction.
Figure 21-3: Web Interface - Voice - Noise Reduction
2. Configure the parameters referring to the table below, and then click Submit.
Table 21-3: Noise Reduction Parameters
Parameter Description
Enable Noise Reduction Efficiently suppresses stationary background noise
(e.g. office noise) and enhances speech by
improving SNR (Signal to Noise Ratio) and
emphasizing the important features of the desired
speech signal. On the phones, an additive noise is
captured due to environmental settings, such as
office noise, air conditioning, etc.
 Disable
 Enable (default)
Enable Noise Reduction Suppression Enables NRS.
 Disable
 Enable (default)
Enable Noise Reduction Post Gain Enables the noise reduction post gain. The post
gain is additional attenuation of the signal which is
performed after the noise reduction operation. It is
needed if the noise is highly non-stationary or of
low SNR. Note that the post gain attenuates also
the speech signal.
 Disable (default)
 Enable
Stationary Level:(0-3) Configures the noise reduction sensitivity to
stationary noise.
0 = sensitive to stationary noise only.
3 = sensitive to highly non-stationary noise.
Default: 2
Maximal Attenuation:(0-15) Defines the maximal noise attenuation during
noise-only periods. Default: 2.