How to Reduce Noise in Sphinx4 application

Question

I am new to sphinx4 and speech recognition thing. I am creating a speech application by using sphinx4. The issue is noise, which results in recognition by program even without s

Answer 1

Static noise cancellation with spectral subtraction is enabled by default in latest version sphinx4-5prealpha. You do not need to do anything special, just use the latest version.

Follow the tutorial:

http://cmusphinx.sourceforge.net/wiki/tutorialsphinx4

Extra speech is ignored in latest version if you are using grammar decoding, not large vocabulary decoding with language model. If you use grammar decoding it should ignore all the words in the grammar. For words not in the grammar it should return a special word .

Accuracy debugging is a complex process and requires a test recording to reproduce accuracy problems. Without test recording it is hard to suggest you how to improve accuracy. Beside test recording you need to provide models you use in decoding and other information to reproduce your results.