THE WHATIS.COM WORD-OF-THE-DAY November 11, 2003 myoelectric signal
______________________ SPONSORED BY: IBM What do you need to make decisions on demand? Smart decisions. Timely decisions. You need accurate information flow. A Business Portal from IBM WebSphere gives employees, suppliers, customers and partners personalized access to the information they need, when are where they need it. The result: Faster, smarter decisions. On demand. See what a Business Portal can do for you. Get your guide to WebSphere Business Portals. http://www.ibm.com/websphere/news/portalwp ________________ TODAY'S WORD: myoelectric signal See our complete definition with hyperlinks at http://searchmobilecomputing.techtarget.com/sDefinition/0,,sid40_gci936219,00.html?track=NL-34 A myoelectric signal, also called a motor action potential, is an electrical impulse that produces contraction of muscle fibers in the body. The term is most often used in reference to skeletal muscles that control voluntary movements. Myoelectric signals have frequencies ranging from a few hertz to about 300 Hz, and voltages ranging from approximately 10 microvolts to 1 millivolt. Myoelectric signals are detected by placing three electrodes on the skin. Two electrodes are positioned so there is a voltage between them when a myoelectric signal occurs. The third electrode is placed in a neutral area, and its output is used to cancel the noise that can otherwise interfere with the signals from the other two electrodes. The output voltage is processed using a device called a differential amplifier. The output of this amplifier has much higher voltage than the myoelectric signals themselves. This higher voltage, which produces significant current, can be used to control electromechanical or electronic devices. Myoelectric signals are of interest to the developers of prosthetic devices, such as artificial limbs. The signals can also be used to facilitate the operation of a computer using small voluntary muscle movements, such as blinking the eyelids. A Japanese company is developing a device that picks up speech using the myoelectric signals from the muscles around the mouth. The eventual goal is to create a mobile telephone that can be worn on, or even implanted in, the body. _______________________ RELATED TERMS: amplifier http://whatis.techtarget.com/definition/0,,sid9_gci211558,00.html?track=NL-34 ______________________ SELECTED LINKS: Jennifer Keetch of the University of New Brunswick describes how myoelectric signals from the eyes can be used to help paralyzed people speak and write. http://www.ee.unb.ca/thesis98/ee4000r/ Robert Uhlig describes NTT DoCoMo's effort to apply myoelectric signals to telecommunications. http://www.smh.com.au/articles/2003/11/09/1068329422485.html ______________________ TODAY'S TECH NEWS: SIEBEL'S HOSTED SOFTWARE GETS EARLY THUMBS UP One beta customer shares its initial experiences with the soon-to-be-released Siebel CRM OnDemand. http://searchcrm.techtarget.com/originalContent/0,289142,sid11_gci935963,00.html?track=NL-34 ORACLE 10G APP SERVER GAINS U.K. GROUND Gartner Inc. is urging Fujitsu Siemens customers in Europe to migrate their application servers to Oracle 10g now that the two companies have reached a new agreement. http://searchoracle.techtarget.com/originalContent/0,289142,sid41_gci935980,00.html?track=NL-34 WITH LINUX, FISHERIES AUTHORITY HAULS IN ROI The Australian Fisheries Management Authority recently moved its database management system from Windows NT to Linux and open source. 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