RTL_SDR | Notion

https://www.rtl-sdr.com/understanding-listening-and-recording-trunked-radio-systems-with-an-rtl-sdr-and-trunk-recorder/#:~:text=Trunked radio systems for voice,almost impossible to do manually.

https://www.rtl-sdr.com/receiving-dstar-voice-dsd-1-7-windows/

tutoral

Tutorial – Decoding Digital Voice using SDRSharp, DSD and RTL-SDR (For Windows)

It is assumed you have an RTL-SDR dongle set up and working with SDRSharp. If not, see the Buy RTL-SDR, and Quickstart pages first before attempting this tutorial.

http://vb-audio.pagesperso-orange.fr/Cable/index.htm

There are two different version of DSD that need to be mentioned. There is DSD 1.7 which is open source software that is under active development and there is DSD+ which is closed source software. DSD+ has vastly superior decoding especially for weak signals but it cannot yet decode D-STAR. DSD 1.7 has poorer decoding, but it is capable of decoding D-STAR. To download each version of DSD see the links below. Once downloaded extract the contents zip file to a folder on your PC.

Compilation instructions and a binary download of DSD 1.7 can be found on this post. Note that the binary download is at the end of the post.
Downloads of the latest DSD+ version can be obtained from dsdplus.com. To install it download both the latest DSDPlus and DSDPlus DLL zip files. Extract both zip files into the same folder.

Next you will need an audio piping utility such as the paid version of Virtual Audio Cable or the free VB-Cable. Also ensure virtual audio cable or VB-cable is set as the default recording audio device in windows sound properties as DSD will use the default sound device.