Performance of SRI's Decipher TM Speech Recognition System on DARPA's CSR Task

The system was evaluated on the speaker-independent (SI) portion of DARPA's February 1992 "Dry-Run" WSJ0 test and achieved 17.1% word error without verbalized punctuation (NVP) and 16.6% error with verbalized punctuation (VP). In addition, we increased the amount of training data and reduced the VP error rate to 12.9%. This SI error rate (with a larger amount of training data) equalled the best 600-training-sentence speaker-dependent error rate reported for the February CSR evaluation. Finally, the system was evaluated on the VP data using microphones unknown to the system instead of the training-set's Sennheiser microphone and the error rate only inere~ased to 26.0%. ways; it includes speaker-dependent vs. speaker independent sections and sentences where the users were asked to verbalize the punctuation (VP) vs. those where they were asked not to verbalize the punctuation (NVP). There are also a small number of recordings of spontaneous speech that can be used in development and evaluation.