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cmusphinxsphinx4

How do I tell the difference between an 8Khz acoustic model and a 16Khz model?

I'm able to get a reasonable level of accuracy with 8khz audio files. Now I want to try a higher sample rate, if I can.

Looking at the acoustic models available on this page, they list:

en-us-8khz.tar.gz     
en-us-semi-full.tar.gz  
en-us-semi.tar.gz  
en-us.tar.gz

The one that says 8khz is obviously the one for the 8khz sample rate, but what about the other three? What sample rates do they match?

If I use a 16khz audio file, which of these acoustic models do I need to use?

And in the absense of the sample rate being in the file name, how do I figure out the sample rate of an acoustic model?

Solution

  • You can open the file feat.params in model folder and look for -upperf parameter. In 8khz model -upperf is usually 3500 or 4000. For 16khz model -upperf is more than 4000, usually 6800.