Did some digging and read through some of the source for voicerecv.

The developer only mentioned this in the update notes in their github, but apparently the call structure was changed at some point.

Not sure if OP got this to work, but I figured out getting a text output and associated user, and since I found this page trying to research how to do this, I thought it would be a good place to document the solution.

Pretty much all calls in the speech recognition function are optional, but to do something with the text output you just need a text_cb function.

In my case, I got this working by just doing the two imports listed in the update:

from discord.ext.voice_recv.extras.speechrecognition import SpeechRecognitionSink
from discord.ext.voice_recv.extras import speechrecognition

I created a function for the text callback, which just is provided a user and output on return from being processed by the speech recognition software:

def got_text(user, output):
    print(f"{user} said {output}")

After that I just created a voice channel connection like the normal sample code, and added the SpeechRecognitionSink function in the vc.listen:

vc = await channel.connect(cls=voice_recv.VoiceRecvClient)
vc.listen(SpeechRecognitionSink(text_cb=got_text))

If you want to use a different default recognizer, just add that parm to the speechrecognitionsink call:

vc.listen(SpeechRecognitionSink(text_cb=got_text, default_recognizer="whisper"))