I have tried CMU Sphinx and it works fine with American English. Now,I want to use CMU Sphinx for detecting (Indian Accent) English. What exactly are the steps/changes I should do?
What you will have to do is adapt the acoustic model. Check the CMU Sphinx wiki page, they have explained the procedure of both training and adapting acoustic models. The link that works for now: http://cmusphinx.sourceforge.net/wiki/
According to what the site says,
CMUSphinx provides ways for adaptation which is sufficient for most cases when more accuracy is required. Adaptation is known to work well when you are using different recording environments (close-distance or far microphone or telephone channel), or when a slightly different accent is present (UK English or even Indian English) or even another language.