MULTI-RATE DIGITAL SIGNAL PROCESSOR FOR SIGNALS FROM PICK-OFFS ON A VIBRATING CONDUIT

摘要

A DIGITAL SIGNAL PROCESSOR (291) FOR DETERMINING A PROPERTY OF A MATERIAL FLOWING THROUGH A CONDUIT (103A-103B) . THE DIGITAL SIGNAL PROCESSOR (201) OF THIS INVENTION RECEIVES SIGNALS FROM TWO PICK - OFF SENSORS (105-105'') MOUNTED AT TWO DIFFERENT POINTS ALONG A FLOW TUBE AT A FIRST SAMPLE RATE.THE SIGNALS ARE CONVERTED TO DIGITAL SIGNALS. THE DIGITAL SIGNALS ARE DECIMATED FROM A FIRST SAMPLE RATE TO A DESIRED SAMPLE RATE.THE FREQUENCY OF THE RECEIVED SIGNALS IS THEN DETERMINED FROM THE DIGITAL SIGNALS AT THE DESIRED SAMPLE RATE.(FIGURE 1)