Patent ID: 6483286
Filing Date: 2002-11-19
Classification: G01R,H03D

Abstract:
An apparatus for measuring an instantaneous frequency of an FM-modulated signal having an arbitrary amplitude value, the apparatus comprising:a sampling system that receives an analog FM modulated signal at a time t, said sampling system sampling the analog FM modulated signal at a prescribed sampling interval T to provide a digitized FM signal; an amplitude detecting system that receives the digitized FM signal, said amplitude detecting system detecting an amplitude of the digitized FM signal and providing an amplitude value; an instantaneous frequency computing system that receives the digitized FM signal and the amplitude value, said instantaneous frequency computing system manipulating the digitized FM signal based on the amplitude value, by performing mathematical operations based on the digitized FM signal and a plurality of additional digitized FM signals, corresponding to alternative sampling intervals, and providing the instantaneous frequency; and a lowpass filtering system that receives the instantaneous frequency and provides a filtered instantaneous frequency.