When installing PocketSphinx it will often fail (using PIP) as the latest wheels provided are for Python 3.6 and to build the source code you need SWIG and GIT (and you need them on your PATH). So ...

My working microphones are: (You can check this by running python -c "import speech_recognition as sr;print(sr.Microphone.list_working_microphones())".) I installed PocketSphinx from PyPI.