| http://www.w3.org/ns/prov#value | - delay generator comprising: a first delay unit having N1 delay elements which are cascaded and respectively have variable delay times where N1 is an integer, said first delay unit receiving a reference signal and generating a first delayed signal; a second delay unit having N2 delay elements which are cascaded and respectively have variable delay times where N2 is an integer, said second delay uni
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