ALFAtron ALF-DSP88-U, Руководство пользователя

Страница: 26 / 48

ALF-DSP88-U
-26-
Note: The settings of the Acoustic Echo Cancellation module can be used cooperatively with the matrix module to determine
signal routes.
3.3.9 Noise Suppression
The Noise suppression module is used to remove non-human voice interference noise. It may distinguish human voice from
non-human voice and treat the latter as noise. After processing, only human voice audio signal is passed to the output
routing.
There is only one Noise Suppression module in the DSP Controller. Multichannel mixers are preset to realize multiple
channels to participate in the noise cancellation processor as shown in the below figure.
Suppression level: There are three levels of noise
suppression including: Mild (-6dB), Medium (-10dB) and
Aggressive (-15dB). dB here refers to the reduction in
decibel level of the suppressed noise. The bigger the
value, the more degradation of voice signal is caused,
therefore use noise suppression very cautiously.
3.3.10 Matrix
The audio Matrix has dual functions including routing and mixing. As shown in the figure below, the horizontal axis indicates
the input channels, and the vertical axis indicates output channels. One-to-one routing of input to output is set as the default
settings. As an example, to mix and route audio signals of channel 1 and channel 2 and then output both select OUT1 on
both IN1 and IN2. If input 1 and 2 participate in auto mixing, then output 1 will not be influenced by the auto mixer. In other
words, after setting auto mixing, echo cancellation and noise suppression modules, routing needs to be set in the matrix
from the correct input sources, like auto mixer, AEC, or ANS to get the correct signal routing.