math - Matlab Log-Likelihood Threshold -

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i try implement speech detection application on matlab. purpose; try examine likelihood between speech , wanted word in speech. use below code calculate likelihood :

[p, log_like] =posterior(model,speech_frame');

model acoustic model of wanted word, speech_frame part of speech contains many wanted word in it. anyway, above code returns log_like 4.969621267039301e+03 or like. need build threshold value. example, if model , speech similar 90%, there wanted word in speech. how can ?

data:

frame : https://dl.dropboxusercontent.com/u/51048269/frame.txt

model acquired : https://dl.dropboxusercontent.com/u/51048269/model_data.txt represented below

model


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