How to set Threshold for keyphrase

[Vamsidhar]

I am following this link http://cmusphinx.sourceforge.net/wiki/tutoriallm%23keyword_lists for recognizing key phrases.

I have no issues with spotting single keyword. I am having issue with spotting key phrase with multiple keywords.

Here are my key phrases: options.gram

open browser 
new e-mail 
forward 
backward 
next window 
last window 
open music player 

Now, I got pocket_sphinix from subversion and successfully build in my system. I created a wav file of lenghth 60 minutues with above phrases. (I set Bit resolution to 16 bit, Sampling rate 16000, audio channel: mono)

Now, I run command like below
pocketsphinx_continuous.exe -infile E:\CMUSphinx\shntool-3.0.0\joined.wav -keyphrase "open browser" -kws_threshold \1e-45 -hmm E:\CMUSphinx\pocketsphinx\model\en-us\en-us -dict E:\CMUSphinx\pocketsphinx\model\en-us\cmudict-en-us.dict

It ran contionously for 3-4 minutes. Attached is ouput. (this file contains final lines of output. when I tried console out put to text file it is only writing my keyphrase.)
1. This command ran continously fpr 3-4 mins. Is it correct behaviour?
2. I am not getting how to identify valid threshold value for given phrase. Can you help me with this?
3. what should be ideal value to feed -kws_threshold?
4. Just to know, Is there any command or any other way, to get threshold value for the given phrase and wav file?

Here is my code:

 SpeechRecognizerSetup setUp = SpeechRecognizerSetup.DefaultSetup();
                setUp.SetAcousticModel(new File(assetsDir, "en-us-ptm"));
                setUp.SetDictionary(new File(assetsDir, "cmudict-en-us.dict"));
                _speechRecognizer = setUp.Recognizer;                
                _speechRecognizer.AddListener(this);
                File menuGrammar = new File(assetsDir, "options.gram");
                _speechRecognizer.AddKeywordSearch(OPTIONS_SEARCH, menuGrammar);

[Nickolay V. Shmyrev]

1. This command ran continously fpr 3-4 mins. Is it correct behaviour?

Running continuously is not a behavior, it shoudl be doing something.

1. I am not getting how to identify valid threshold value for given phrase. Can you help me with this?
2. what should be ideal value to feed -kws_threshold?
3. Just to know, Is there any command or any other way, to get threshold value for the given phrase and wav file?

This issue is covered in tutorial

http://cmusphinx.sourceforge.net/wiki/tutoriallm#keyword_lists

[Andrea Lisi]

1. what should be ideal value to feed -kws_threshold?

Now that pocket_continuous is working, I just try different values and I see how many times the keyprhases are recognized.
For example, from my trials I am doing now, I noticed that it gives good results (it recognized almost exactly all the occurences of my keyphrase) if the exponent is = (keyprhase_number_of_syllabus + 1) * 5
For example 3 syllabus -> 1e-20.
This with spanish words.

But in realtime appliation (speak to microphone and process audio) it looks to work better if for a 3 syllabus word I use as threshold 1e-15 (syllabus * 5).

I am still trying to experiment with keyprhases.
Maybe can be helpful adapt the acoustic model too.

[Andrea Lisi]

I am going to the same thing.
But the point is that when I run pocketsphinx_continuous.exe it crashes after printing this line:

INFO: tmat.c<206>: Reading HMM transition probability matrices: hmm/transition_matrices

saying

Debug Assertion Failed!
Program:
..in32/pocketsphinx/bin/debug/Win32/pocketsphinx_continuos.exe
File: ../read.c
Line 85

I am using the Spanish acousti model provided in the download page.

So I tried to put by hand values, but I have no idea which to put, because keywords with threshold like 1e-5 aren't recognized; keywords with threshold around 1e-40 are recognized mixed.
For example:

no pasa nada /1e-50/
ve izquierda /1e-50/
que quieres /1e-45/
ve derecha /1e-40/

the output is a mixture of those keyphrases.

(I set Bit resolution to 16 bit, Sampling rate 1600, audio channel: mono)

I guess it's a typing error, because the sample rate should be 16000. Right? XD

[Nickolay V. Shmyrev]

This issue is covered in FAQ. Crash is caused by runtime mismatch between pocketsphinx dll and sphinxbase dll.

[Andrea Lisi]

Thanks!
With the pre-compiled version is working

[Vamsidhar]

Yes. Thats type error. I just updated.

NFO: tmat.c<206>: Reading HMM transition probability matrices: hmm/transition_matrices
saying
Debug Assertion Failed!
Program:
..in32/pocketsphinx/bin/debug/Win32/pocketsphinx_continuos.exe
File: ../read.c
Line 85

do you have sphinixbase.dll in the same folder where you are running pocketsphinx_continuos.exe? It wont be there unless you copy it.

[Andrea Lisi]

Yes

It gives you "dll missing error" if there isn't..

I am still troubleshooting about assigning thresholds. I am trying this "keyphrase" since this morning.
So I will keep on following your question!
Thanks for asking!