About: http://webisa.webdatacommons.org/177021469

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	In a case where there is an obstacle between the speaker and the listener, an echo is applied or a tone quality (characteristic of a filter) is varied, in order to express that sound is propagated indirectly.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com