About: http://webisa.webdatacommons.org/291572916

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	More preferably the signal has a sine, square or triangular waveform of frequency 333 Hz to 1 kHz (ideally 400 to 800 Hz e.g. 600 Hz) and a power of a few (e.g. 100) mW.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es