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Table 4-17 Interference Canceller (IC) parameter
COMMAND
TYPE VALUE
DESCRIPTION
NOTE
S
SET_BYPASS_IC
GET_BYPASS_IC
uint32 [0,1]
Set IC bypass parameter. If set to one, IC
processing is bypassed.
0 = IC bypass disabled (default)
1 = IC bypass enabled
A
SET_CH1_BEAMFORM_ENABLE
GET_CH1_BEAMFORM_ENABLE
uint32 [0,1]
Enable beamformed output on IC output
channel index 1.
0 = Passthrough IC input channel 1 onto
IC output channel 1
1 = Beamformed output on IC output
channel 1 (default)
RESET_FILTER_IC
This command resets the IC filter.
[A] If Alternative architecture mode (ALT_ARCH) is enabled (default), the IC bypass state will be
dynamically changed by the firmware. Do not use the SET command. The GET command remains
functional.
4.5.5.
NOISE SUPPRESSOR (NS)
The Noise Suppressor (NS) suppresses noise from sources whose frequency characteristics do not
change rapidly over time. This includes diffuse background noise and stationary noise sources.
The following table describes the settings for the Noise Suppressor.
Table 4-18 Noise Suppressor (NS) commands
COMMAND
TYPE
VALUE DESCRIPTION
SET_BYPASS_SUP
GET_BYPASS_SUP
uint32
[0,1]
Set suppressor bypass parameter. If set to one, the suppressor,
which contains the noise suppression stages is bypassed.
0 - suppressor bypass disabled (default)
1 - suppressor bypass enabled
SET_ENABLED_NS
GET_ENABLED_NS
uint32
[0,1]
Set noise suppression enabled parameter within the suppressor.
If set to one, the noise suppression stage within suppressor is
enabled. Changing this parameter only takes effect if the
suppressor is not bypassed.
0 - noise suppression disabled
1 - noise suppression enabled (default)
4.5.6.
AUTOMATIC GAIN CONTROL (AGC) AND LOSS CONTROL
The Automatic Gain Control (AGC) can dynamically adapt the audio gain, or apply a fixed gain such
that voice content maintains a desired output level. The AGC uses an internal Voice Activity Detector
to normalise voice content and avoid amplifying noise sources and applies a soft limiter to avoid
clipping on the output.
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