Single Frequency Filter
Original Publication Date: 1986-Dec-01
Included in the Prior Art Database: 2005-Mar-09
This article describes a new technique for extracting from a composite waveform the magnitude of a known single frequency, sinusoidal, noise component that is a part of the composite waveform. The purpose for this derivation is to apply corrections for this component either in hardware or in output interpretations (software). This technique applies when the frequency of the fundamental waveform is substantially different than the known single frequency sinusoidal noise component of the composite waveform. When the noise waveform is known to be 60 cycles, the new technique applies as follows: Sample the composite waveform at 250/sec for amplitude. Then sample the same composite waveform at 60/sec to determine the magnitude at each 1/60 of a second.