How to get the posterior probability of each character

[yipukangda]

Hi,

I want to get the probability of each character after decode with CTC(such as if inferred string is "hello", and each state probability is [0.81, 0.97, 0.87, 0.43, 0.92]), to infer if there is some noise in some part of wav file. I am not vary familiar with how to get state posterior for CTC path, so could you tell me how to do it?

Thanks.