In this project, we have evaluated our prototype recognition
system on three tasks:
- degradations in performance on continuous digit strings (TIDigits)
due to speech compression;
- real-time recognition on DARPA's Resource Management Task;
- the Naval Research Lab's (NRL) SPeech In Noisy Environments (SPINE).
We evaluated our baseline system on coded speech generated by the Mixed
Excitation Linear Prediction (MELP) and Continuously Variable Slope
Delta Modulation (CVSD) algorithms. The baseline system achieved a
performance of 0.4% WER on clean speech. MELP coded speech produced a
WER of 0.7% while CVSD coded speech produced a WER of 2.1%. Though
the relative increase in error rate is considerable for both of
these algorithms, the absolute performance is still respectable.
Performance is summarized below in Table 1.