About: http://webisa.webdatacommons.org/9541978

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	Another common problem is that of room reverberation produced by acoustic reflections off the walls, ceiling, floor, and other surfaces in a room.
http://www.w3.org/ns/prov#wasQuotedFrom	patents.com