Call routing device employing continuous speech

Details Call routing device employing continuous speech Call routing device employing continuous speech

1996-05-06

1998-08-25

Brown, Thomas W.

Telephonic communications

Audio message storage, retrieval, or synthesis

Multilingual system or operation

379216, H04M 130, H04M 342

Patent

active

057990654

ABSTRACT:
The call routing device plugs into existing extensions of the office telephone network or PBX system and acts as a "virtual" operator, prompting incoming callers to spell the name of the desired recipient. The speech recognizer uses a multipass procedure employing Hidden Markov Models and dynamic programming. The N-best hypotheses are propagated between passes, allowing the more computationally costly routines to be reserved until the final pass, when the size of the search space is significantly reduced. The routing device prompts the user to confirm that the selected name is correct, whereupon the device signals the telephone network to automatically switch the incoming call to the telephone extension of the selected recipient.

REFERENCES:
patent: 3928724 (1975-12-01), Byram et al.
patent: 4164025 (1979-08-01), Dubnowski et al.
patent: 4763350 (1988-08-01), Immendorfer et al.
patent: 5303299 (1994-04-01), Hunt et al.
patent: 5572577 (1996-11-01), Harrila
patent: 5594784 (1997-01-01), Velius
patent: 5638425 (1997-06-01), Meador, III et al.

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