Operating Manual for Digital Sound Processor (DSP) V3.0
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3.4.12 Echo Canceller
Acoustic echo canceller (AEC for short) is a kind of digital audio signal processing technology. It is
used in audio/video conference when conferees in local conference room are talking with one or
more speakers certain distance away. AEC program increases remote speaker’s phonetic
intelligibility via cancelling acoustic echo generated in local room.
Echo cancellation module for remote calls can be used to carry out local amplification of remote voice
signals and attenuate the interference caused by acoustic echo. Its basic operation principle is
simulating echo channel, estimating possible echo generated by remote signals and then minus the
estimated signal from input signal of microphones, and thus there will be no echo generated in input
voice signal to achieve the goal of cancelling echo.
There is only an echo cancellation module in DSP Controller. Two local input and remote output
mixers are preset to realize multichannel signal participating echo cancellation as shown in the figure.
A parameter can be adjusted:
Non-linear filter (NLP): Three types including Conservative, Moderate and Aggressive can be selected
to determine echo suppression level.
No
te: The settings of echo cancellation module shall be used cooperatively with matrix module
setting signal router.
3.4.13 Noise Suppression
Noise suppression module can remove non-human voice effectively. It may distinguish human voice
from non-human voice and treat the latter as noise. After its processing, only human voice is
theoretically left for an audio file consisting both human voice and noise.
There is only an echo cancellation module in DSP Controller. Multichannel mixers are preset to realize
multichannel participating noise cancellation as shown in the figure.
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