The Grammar Tester compares transcripts of interactions to the output of a speech engine, and returns an alignment type. The alignment type gives information on how well the speech engine recognized the spoken input. The alignment types are:
MATCH (m): The speech engine recognize the same words as the transcript.
| Transcript: | TWO | THREE |
| ASR Result: | TWO | THREE |
| Alignments: | (m) | (m) |
INSERTION (i): The speech engine recognized more words than the transcript.
| Transcript: | * | TWO | THREE |
| ASR Result: | ONE | TWO | THREE |
| Alignments: | (i) | (m) | (m) |
DELETION (d): The speech engine recognized fewer words than the transcript.
| Transcript: | ONE | TWO | THREE |
| ASR Result: | * | TWO | THREE |
| Alignments: | (d) | (m) | (m) |
SUBSTITUTION (s): The speech engine recognizes a word different from the transcript
| Transcript: | TWO | THREE |
| ASR Result: | FOUR | THREE |
| Alignments: | (s) | (m) |
OOV_INSERTION (OI): The transcript's word is out-of-vocabulary but the engine adds an extra word.
In this example, "know" is not in the grammar so it's considered to be out-of-vocabulary.
| Transcript: | KNOW |
| ASR Result: | DELTA |
| Alignments: | (oi) |