About: http://webisa.webdatacommons.org/200912808

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	The non-audible signal allows an attenuator to attenuate a microphone signal including the composite signal from a particular microphone in response to the detected non-audible signal to reduce far end echo.03-25-2010
http://www.w3.org/ns/prov#wasQuotedFrom	faqs.org