manual.text

这是一个从音频信号里提取特征参量的程序

OVERVIEW:
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The basic idea of network builder is to represent knowledge sources for speech recognizer in a generalized hierarchy. These knowledge sources include language model, pronunciation model and HMM topologies etc. Figure 1 shows a typical hierarchical structure for a continuous digit speech recognizer. At the top level (word level), the language model for a sentences with continuous digits is represented as a digraph with loop back arc which allows any digit can follows the other. In such a generalized hierarchical structure, each level can be conceptually considered as the same. Phrases, words or phones are simply symbols at different levels. Each level contains a list of symbols Sij and a list of graphs Gik., where, i is the index of the level, j is the index of the symbol and k is the index of the graph. Each graph has at least two dummy vertices, the start vertex and the terminal vertex both indicating the start and the end points of the graph in a search space.


MAIN PANEL
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The main frame of isip_network_builder is divided into three panel. The top-left panel labeled with Hierarchy shows the generalized hierarchical structure of the model. The bottom-left panel labeled with Graph List shows the list of graphs at current level. The right panel is the drawing area which allows users to construct graphs by inserting nodes and arcs. Here are the explanation of menu options: 

File Menu: 
      New: Clears the current window, and open a blank file. 
      Open: Opens a existing network builder file. 
      Save: Saves the current file. 
      Save As: Saves the current file to a different file name. 
      Close: Closes the current file. 
      Exit: Exits network builder. 

Hierarchy Menu: 
      Add Level: Adds a level to the hierarchy. 
      Delete Level: Removes the currently selected level from the hierarchy. 
      Symbols: Opens the symbol table for the current level. 

Graph Menu: 
      Insert Start: Inserts a start node, each graph must have a start node. 
      Insert Stop: Inserts a stop node, each graph must have a stop node. 
      Insert Node: Inserts a node into the current graph. 
      Insert Arc: Inserts an arc between two nodes. 
      Insert Self Arc:Inserts an self connecting arc. 
      Copy: Copies the selected node to the clipboard. 
      Cut: Copies and deletes the selected node. 
      Paste: Pastes the node from the clipboard. 
      Delete: Deletes the currently selected node. 
      Copy Graph: Copies the selected graph to the clipboard. 
      Paste Graph: Pastes the graph from the clipboard. 


FAQ
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1. How to change the weight of an arc ?
Right-click the arc to bring up a configuration window.

2. How to define the property of a symbol at a certain level ?
Click on the level first and then select Hierarchy --> Symbols from the
Menu option.

3. What is the difference of three different format ?  
The format with "text" extension is the format used by this tool. If
you store the models in this format, all the information of the graphs
will be preserved. The format with sof extension can be used directly
by isip_recognizer. The graph in this format is stored as Directional
Graph called DiGraph. The structure of each graph is stored but the
original layout of each node in the graph is not stored. You can open
file in this format with the isip_network_builder. The
isip_network_builder will automatically set the layout of the graph
for you. The format with "jsgf" extension can be also used directly by
isip_recognizer. The graphs are stored in terms of JSGF grammar. The
layout information of graphs will be stored in this format. You can
also open file in this format with isip_network_builder by automatic
layout.

SUPPORT
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The Transform Builder tool is developed by:

Institute for Signal and Information Processing (ISIP)

Department of Electrical and Computer Engineering
PO Box 9571, Mississippi State University
Mississippi State, MS 39762

Voice / Fax: [phone]
WWW: http://www.isip.msstate.edu/

Please direct you questions and comments to: [e-mail].