About: http://webisa.webdatacommons.org/228019369

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 short they are expressed by R=F(r), M=F(m) and H=F(h) where F( ) is defined as the operator for forward FFT and F???1( ) is defined as the operator for inverse FFT. The ???underscore??? indicates that the signal is a vector.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com