Digital Signal Processing Reference
In-Depth Information
150 examples of such phrases, the number of phrases supported by one of the simulation
vendors speech recognition systems is in excess of 500,000.
The USAF, USMC, US Army,US Navy and FAA as well as a number of international
ATC training organizations such as the Royal Australian Air Force and Civil Aviation
Authorities in Italy, Brazil, Canada are currently using ATC simulators with speech
recognition from a number of different vendors.
Telephony and other domains
ASR in the field of telephony is now commonplace and in the field of computer gaming
and simulation is becoming more widespread. Despite the high level of integration with
word processing in general personal computing, however, ASR in the field of document
production has not seen the expected increases in use.
The improvement of mobile processor speeds made feasible the speech-enabled Symbian
and Windows Mobile Smartphones. Speech is used mostly as a part of User Interface, for
creating pre-defined or custom speech commands. Leading software vendors in this field
are: Microsoft Corporation (Microsoft Voice Command), Digital Syphon (Sonic
Extractor), Nuance Communications (Nuance Voice Control), Vito Technology (VITO
Voice2Go), Speereo Software (Speereo Voice Translator and SVOX.
Further applications
Automatic translation;
Automotive speech recognition (e.g., Ford Sync);
Telematics (e.g. vehicle Navigation Systems);
Court reporting (Realtime Voice Writing);
Hands-free computing: voice command recognition computer user interface;
Home automation;
Interactive voice response;
Mobile telephony, including mobile email;
Multimodal interaction;
Pronunciation evaluation in computer-aided language learning applications;
Robotics;
Video games, with Tom Clancy's EndWar and Lifeline as working examples;
Transcription (digital speech-to-text);
Speech-to-text (transcription of speech into mobile text messages);
Performance
The performance of speech recognition systems is usually specified in terms of accuracy
and speed. Accuracy is usually rated with word error rate (WER), whereas speed is
measured with the real time factor. Other measures of accuracy include Single Word
Error Rate (SWER) and Command Success Rate (CSR).
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