HVAC Control in the New Millennium.pdf - HVAC.Amickracing

HVAC Control in the New MillenniumSpeech understanding involves speech recognition and word understanding.Speech recognition deals with recognizing that a certainseries of sounds represents a certain word. Word understanding is naturallanguage understanding and deals with the relationships betweendifferent words.Most people think that they hear and understand about 80% ofwhat is said. The actual percentage can be less than 50%. One factor thatcauses a low speech recognition percentage is the use of homonyms,words that sound alike, but have different meanings. Following aresome typical homonyms:for fore fourtheir there they’reto too twoHomonyms can also consist of groups of words like the followingphrases:recognize speechwreck a nice beachAlso, every person has a unique micro-accent, speaks at differentfrequencies and varying speeds, and tends to run words together.Speech understanding starts with hearing sounds, which mustthen be recognized as words. Finally the words must be combined toproduce idea understanding. Hearing is the process of responding tosound waves. This requires some type of specialized sound-wave receptor.A microphone is a transducer that converts sound waves to electricalenergy. A microphone is actually a special loudspeaker running backwardto detect sounds.Speech recognition systems are used to recognize spoken words.These may work on one word at a time or on continuous speech. Thesystem may be tuned to a single person’s voice, or it may be usable bymany different persons. The least expensive systems operate with isolatedwords and are speaker-dependent.Speaker-dependent SystemsA speaker-dependent system is a speech recognition system thatrecognizes only the words or commands spoken by one particular hu-©2001 by The Fairmont Press, Inc. All rights reserved.