About: http://webisa.webdatacommons.org/371475169

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	FIG. 1B is a schematic block diagram of a prior art circuit for extracting the tone output (i.e. a frequency and a phase) from the reception input by using the phase-locked circuit.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com