Meeting Transcription Using Virtual Microphone Arrays
Table 6: Diarization error on speaker-attributed ASR output. The percentage of overlapped speech is 10.0%, and accounts for most of the missed speech.
['[EMPTY]', 'Misses', 'FAlarms', 'SpkrErr', 'DER']
The false alarm rate is quite low since the recognizer acts as a very conservative speech detection engine. Similar to word recognition, CNC reduces the speaker error (44% relative) by pooling speaker label posterior probabilities across all channels.