Speech Recognition Research at AT&T Bell Laboratories

At AT&T Bell Laboratories, we have studied a broad range of systems for speech recognition, depending on the intended application area. We have extensively studied systems for isolated word (and phase) recognition for command and control applications where a single word (or phrase) suffices to effect some type of control over a system or service. Typical applications include call type recognition for automated dialing and call routing within an organization. We have also implemented several systems for connected word recognition with vocabularies ranging from the digits up to several hundred words. Typical applications for this technology include order entry, credit card entry, and digit dialing. Most recently we have begun several studies of large vocabulary (1,000-50,000 words), continuous speech recognition.