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<h2 id="see-also">See also</h2> <ul><li><a href="/facts/Voice_activity_detection/qbCG12fE">Voice activity detection</a></li> <li><a href="/facts/Silence_suppression/E28IYUSn">Silence suppression</a></li> <li><a href="/facts/Discontinuous_transmission/boTbwXJK">Discontinuous transmission</a></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>K. Bullington, J.M. Fraser (March 1959). "Engineering aspects of TASI" (PDF). Bell System Technical Journal. p. 353.[permanent dead link] <a href="http://orion.research.bell-labs.com/BSTJ/images/Vol38/bstj38-2-353.pdf" target="_blank">http://orion.research.bell-labs.com/BSTJ/images/Vol38/bstj38-2-353.pdf</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> </ol>