Narrowband analog noise cancellation

摘要

A method, including receiving an input analog signal containing noise at a specific noise frequency and digitizing the input analog signal to form a digitized signal. The method also includes recovering a first amplitude and a first phase of the noise from the digitized signal, and generating an analog correction signal at the specific noise frequency. The analog correction signal has a second amplitude equal to the first amplitude and a second phase opposite to the first phase. The method further includes summing the input analog signal with the analog correction signal to generate an output analog signal.

主权项

1. A method for cancelling noise in a medical system, the method comprising the steps of:
providing a medical system comprising (i) an analog-to-digital (A/D) converter which is coupled to receive an input analog signal containing noise at a specific noise frequency, (ii) a signal analyzer, (iii) an analog signal generator which is configured to generate an analog correction signal, and (iv) a summation block which sums the input analog signal with the analog correction signal to generate an output analog signal; receiving an input analog signal containing noise at a specific noise frequency at the analog-to-digital (A/D) converter; digitizing the input analog signal with the analog-to-digital (A/D) converter to form a digitized signal; recovering a first amplitude and a first phase of the noise from the digitized signal with the signal analyzer; generating an analog correction signal at the specific noise frequency having a second amplitude equal to the first amplitude and a second phase opposite to the first phase with the analog signal generator; and summing the input analog signal with the analog correction signal with the summation block to generate an output analog signal.