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A large speech database has been collected for use in designing and evaluating algorithms for speaker independent recognition of connected digit sequences. This dialect balanced database consists of more than 25 thousand digit sequences spoken by over 300 men, women, and children. The data were collected in a quiet environment and digitized at 20 KHz. Formal human listening tests on this database provided certification of the labelling of the digit sequences, and also provided information about human recognition performance and the inherent recognizability of the data.
R. G. Leonard (Thu,) studied this question.