How do I change sample rate of audio in linux ubuntu from 48k to 24k [closed]

I am currently not able to change the microphone sample rate from 48k to 24k on linux.My distro is ubuntu, I have installed pulse audio to change the config, any other framework for changing this is also much appreciated.

So I have tried several things

1. Downloaded pulseaudio and changed the config file here to etc/pulse/daemon.conf
2. But still when I run pacmd list-sinks | grep -e 'index:' -e 'name:' -e 'sample spec:'it still shows 48000
3. When I check the config using pulseaudio --dump-conf it shows 24000

What should I do to change the sample rate in linux distro is ubuntu.