My mother didn't struggle to speak until her last couple of weeks (when she just went very quiet) but the other residents in her care home did. I visited mum for 3 years and during that time there were many residents (who came and went) who had various vocal 'issues'. Some were just very limited in what they said, others were 'shouters' which was sometimes an issue. If residents were in the lounge and a particular man was there, it caused problems! A couple of ladies would continually tell him to 'shut up!' because he would loudly and suddenly make the sort of sounds you describe
@Ptal
There was a man in the room next to mum's for a while and he scared me! He was constantly shouting, 'Help! Police!' Get them off me! **** off you *********! Help me!' The staff did their best to calm him and he was (I was told) much worse when they tried to move him or do personal care, but it was distressing for me next door, hearing all this and knowing I could not respond to his desperate cries for help. I was going to complain on mum's behalf but she wasn't bothered by it. She once said to me, 'That silly man next door is always singing at the top of his voice...' so I didn't bother! He was only there a short time...
But loud noises/incoherent sounds/paucity of speech are very much part of the later stages. I honestly don't know how anyone lives with it - I take my hat off to you.