I'm looking for a program that can convert audio files from NIST sphere format (SPH) to WAV.
Any license, operating system and price is fine.
I tried SoX (Sound eXchange) (free, CLI, Linux):
sudo apt-get install -y sox sox file.sph file.wav
but with some files (e.g., WSJ speech recognition corpus) I did the message:
sph: unsupported coding `pcm,embedded-shorten-v1.1'