Algorithm to determine fundamental frequency from potential harmonics

Question

I am attempting to extract a fundamental frequency from a sound source. maybe someone is singing A3 into the microphone, so I want to be detecting ~ 110Hz

my appr

Answer 1

I have rephrased the question, and provided an answer here: How to take in a set of numbers like {301,102,99,202,198,103} and throw out ~100?

I had looked at several approaches, and this is considerably more succinct than anything else I've found. I have tested it and it works very well.