Ubuntu 20.04 turns on hidden recording noise reduction function (recommended)

Recently, when using kazam in Ubuntu 20.04 for recording, I found a problem:

When recording using the system's default configuration, the recorded audio has noticeable noise . I remember that there is a microphone noise reduction option in the WIndow system, but I have never found it on Ubuntu. Later, I found a solution to this problem on ask ubuntu. This is a hidden setting that needs to be enabled by modifying the configuration file.

To enable the noise reduction function, we need to modify our system configuration file ( /etc/pulse/default.pa configuration file).
Before modifying it, we need to back up this file.

sudo cp /etc/pulse/default.pa /etc/pulse/default.pa._bak

After the backup is complete, we start to modify this configuration file. Modifying the configuration file is also very simple. We just need to paste the configuration information to the end of the configuration file. Let's first use vim to open this configuration file:

sudo vim /etc/pulse/dafult.pa

After opening the file, use shift + g to jump to the end of the file, and then copy our configuration information into it.
The detailed configuration information is as follows:

#ActiveNoiseRemoval
.ifexists module-echo-cancel.so
load-module module-echo-cancel aec_method=webrtc source_name=mic source_properties=device.description=MicHD
set-default-source "mic"
.endif

After completion, we reboot the system sudo reboot .
Then open the settings panel. At this time, we can see that there is one more option ( MicHD ) in the drop-down list of設置-聲音-輸入.

Switch the screen recording software kazam to MicHD

At this time, we select MicHD and then use the microphone to record. The recorded audio will basically have no background noise.

Summarize

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