Subvocal recognition (SVR) is the process of taking subvocalization and converting the detected results to a digital output aurally or text-based.
Subvocal speech recognition deals with electromyograms that are different for each speaker. Therefore, consistency can be thrown off just by the positioning of an electrode. To improve accuracy, researchers in this field are relying on statistical models that get better at pattern-matching the more times a subject "speaks" through the electrodes, but even then there are lapses. At Carnegie Mellon University, researchers found that the same "speaker" with accuracy rates of 94% one day can see that rate drop to 48% a day later; between two different speakers it drops even more.
Relevant applications for this technology where audible speech is impossible: for astronauts, underwater Navy Seals, fighter pilots and emergency workers charging into loud, harsh environments. At Worcester Polytechnic Institute in Massachusetts, research is underway to utilize subvocal information as a control source for sophisticated computer music instruments.
Research and Patents
The Brain Computer Interface R&D program at Wadsworth Center under the New York State department of health has confirmed the existing ability to decipher consonants and vowels from imagined speech, which allows for brain-based communication using imagined speech.
US Patents on silent communication technologies include: US Patent 6587729 "Apparatus for audibly communicating speech using the radio frequency hearing effect", US Patent 5159703 "Silent subliminal presentation system", US Patent 6011991 "Communication system and method including brain wave analysis and/or use of brain activity", US Patent 3951134 "Apparatus and method for remotely monitoring and altering brain waves".
In Speaker for the Dead and subsequent novels, author Orson Scott Card described an ear implant, called a "jewel", that allows subvocal communication with computer systems. Author Robert J. Sawyer made use of subvocal recognition to allow silent commands to the cybernetic 'companion implants' used by the advanced Neanderthal characters in his Neanderthal Parallax trilogy of science fiction novels. In Earth, David Brin depicts this technology and its uses as a normal gear in the near future. In Down and Out in the Magic Kingdom, Cory Doctorow has cellphone technology become silent through a cochlear implant and micing the throat to pick up subvocalization.
William Gibson's Sprawl Trilogy frequently uses sub-vocalization systems in various devices.
In Kage Baker's Company novels, the immortal cyborgs communicate subvocally.
In the Culture novels by Iain M. Banks, more highly advanced species often communicate subvocally through their technology.
- Communication system and method including brain wave analysis and/or use of brain activity