公开(公告)号：US3705353A

公开(公告)日：1972-12-05

申请号：US3705353D

申请日：1970-07-13

Applicant: CENTRE NAT ETD SPATIALES

Inventor： RANDOING JEAN-MARTIAL

IPC: G11B20/22 ,  H04L27/10 ,  G11B15/52

CPC classification number: G11B20/225

Abstract: The processing of an information carried by a frequency with the object of digitizing it is performed along the so-called ''''quasiconstant'''' system used in PFM type telemetric data analysis. Two like but distinct circuits each operating in accordance with the ''''quasi-constant'''' system are used - the recorded information signal and a fresh reference frequency delivered by a clock are respectively applied to the two inputs of one of these circuits, whereas the recorded reference signal and the same fresh reference frequency as above are respectively applied to the two inputs of the other of these circuits.