A friend of mine tooking in a cat that had been owned by a deaf family. This cat didn't make any noise (meow) at all, if she wanted to go out, etc., she would run between you legs, (yes, totally under-foot!) a major trip hazard. I taught her how to vocalize very quickly, which she understood we would hear, and would respond too.
A cat with deaf human parents would have never learned this, or would have learned that meowing doesn't work and to try something else.