Noise event suppression for monitoring system

摘要

A noise event suppression technique for a monitoring system detects a noise event in a signal waveform when a focal sample in the waveform has an amplitude greater than an amplitude of algorithmically determined earlier and later samples in the waveform that are noncontiguous with the focal sample. When the monitoring system detects the noise event, the monitoring system reduces the amplitude of the focal sample to an amplitude between those of the earlier and later samples. The monitoring system outputs data determined using the waveform once noise events have been adequately suppressed.

主权项

1. A method for suppressing noise events in a signal waveform having a plurality of samples, comprising:
acquiring by a monitoring system the waveform; selecting by the monitoring system from the plurality of samples a focal sample; determining algorithmically by the monitoring system from the plurality of samples a discrete sample earlier than the focal sample and a discrete sample later than the focal sample that are noncontiguous with the focal sample; determining by the monitoring system whether the focal sample has an initial amplitude greater than an amplitude of the discrete earlier sample and greater than an amplitude of the discrete later sample; reducing by the monitoring system the initial focal sample amplitude to a reduced focal sample amplitude between the earlier and later sample amplitudes in response to determining that the initial focal sample amplitude is greater than the earlier and later sample amplitudes, and outputting by the monitoring system data determined using the waveform; wherein the first determining step comprises identifying a current sample group consisting of the focal sample, one or more samples earlier than the focal sample that are contiguous with the focal sample and one or more samples later than the focal sample that are contiguous with the focal sample; identifying an earlier sample group consisting of the discrete earlier sample and two or more additional samples that are earlier than the current sample group; identifying a later sample group consisting of the discrete later sample and two or more additional samples that are later than the current sample group; determining that the discrete earlier sample is a median amplitude sample of the earlier sample group; and determining that the discrete later sample is a median amplitude sample of the later sample group.