Method for processing signals in vortex flowmeters

A method for processing a vortex generated electrical signal comprising in combination:

• a) supplying an input electrical signal generated by a transducer included in a vortex sensor and conditioned by a preamplifier to an input end of a plurality of electronic filters disposed in a parallel arrangement;
• wherein each of said plurality of electronic filters includes each of a plurality of normally open switches closing and opening depending on a control signal generated as a function of frequency band of an alternating electrical signal, said each of the plurality of electronic filters transmitting the input electrical signal through and to an output end of said each of plurality of electronic filters at a desired efficiency when said each of the plurality of switches is closed and cutting off transmission of the input electrical signal through said each of the plurality of electronic filters when said each of the plurality of switches is open;
• b) detecting a dominant frequency of the input electrical signal taken off prior to the input end of the plurality of electronic filters and before being transmitted through the plurality of electronic filters;
• and
• c) generating the control signal as a function of said dominant frequency of the input electrical signal taken off prior to the input end of the plurality of electronic filters and before being transmitted through the plurality of electronic filters, and supplying the control signal to the plurality of switches respectively controlling transmissions of the input electrical signal through the plurality of electronic filters;
• wherein the control signal closes only one of the plurality of normally open switches belonging to one of the plurality of electronic filters, said one of the plurality of electronic filters transmitting the input electrical signal at a desired efficiency within a frequency band characterized by said dominant frequency of the input electrical signal generating the control signal.