Overview: Automatic Speech Recognition

                     +-----------------+     +-----------------+
                     |                 |     |                 |
   speech signal --> |  preprocessing  | --> | classification  | --> hypothesis
                     |                 |     |    (search)     |
                     +-----------------+     +-----------------+
                                                     ^
                                                     |
                                                     |
                                             +-----------------+
                                             |                 |
                                             | speech model    |
                                             |                 |
                                             +-----------------+