6.2.4 Network Builder: Acoustic Models
In addition to creating language models, Network Builder can also be used to create acoustic model files. The steps to doing this are simple. To begin with, you need a completed language model file, built as explained in the previous sections. Go to the directory:
Open the language model with network builder and select the state level. Next click the Hierarchy menu and click Symbols. This will give you a table of all the symbols in this level of the hierarchy. The panel to the right of this table contains a list of symbol types, one of which is 'attach statistical'. Click the first symbol and drag your mouse across the remaining symbols. This should select all of them. Once they are all highlighted, click 'attach statistical', and then click OK. Now, go to the File menu and click Save All. A window will pop up with two text boxes, one specifying where to save the language model file and the other specifying where to save the statistical model. Save the statistical model as smp_phone.sof in the current directory. Save the language model as lm_phone_jsgf.sof. Click OK and exit Network Builder. The file Network Builder creates is only a hash table of symbols. We must now use isip_recognize to complete the acoustic model file by creating models that correspond to each of the symbols. For this step, we'll use the "MODEL_CREATION" algorithm of isip_recognize. There should be a parameter file called params_mc.sof in your current directory. The important difference between this parameter file compared to the ones we've worked with previously is the algorithm specified as "MODEL_CREATION". This tells isip_recognize to generate an acoustic model file from the hash table. Run the following command:
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