Voice search, also called voice-enabled search, allows the user to use a voice command to search the Internet, or a portable device. Currently, voice search is commonly used in (in a narrow sense) "directory assistance", or local search. Examples include Google 411, Tellme directory assistance and Yellowpages.com's 1-800-YellowPages. In a broader definition, voice search include open-domain keyword query on any information on the Internet, for example in Google Voice Search. Given that voice-based systems are interactive, such systems are also called open-domain question answering systems.
Voice search is often interactive, involving several rounds of interaction that allows a system to ask for clarification. Voice search is a type of dialog system.
Ye-Yi Wang, Dong Yu, Yun-Cheng Ju, Alex Acero, An Introduction to Voice Search, IEEE Signal Processing Magazine (Special Issue on Spoken Language Technology), Institute of Electrical and Electronics Engineers, Inc., May 2008
J. Sherwani, Dong Yu, Tim Paek, Mary Czerwinski, Yun-Cheng Ju, and Alex Acero. 'VoicePedia: Towards Speech-Based Access to Unstructured Information', Proceedings of the 8th Annual Conference of the International Communication Association (Interspeech 2007). Antwerp, Belgium, August, 2007