Patent ID: 9294139
Filing Date: 2016-03-22
CPC Classification: A61B,G01N,H04B

Claim Text:
1. A data acquisition system coupled to a first mains power source, comprising: a test probe that generates a signal, wherein the signal comprises a noise component that is synchronous with the first mains power source; a zero crossing detector that generates a cycle start signal in accordance with a voltage of the first mains power source; an analog to digital converter, wherein the analog-to-digital converter samples the signal provided by the test probe and generates data samples at a sampling rate; a noise replica generator that generates noise replicas from the data samples at a replica generation rate and noise estimates from the noise replicas at the sampling rate, wherein the replica generation rate is less than the sampling rate; and a noise removal module that removes each noise estimate from a corresponding data sample, wherein the noise estimate represents the noise component in the data sample.