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Adaptive notch filter

An adaptive notch and filter technology, applied in applications, sensors, medical science, etc., can solve problems such as unwanted characteristics

Active Publication Date: 2014-05-21
DRAGERWERK AG
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0036] While adaptive notch filters have had some success in estimating the amount of disturbance in an input signal to provide filtered signals, these filtered signals often have unwanted noise associated with them caused by the less than optimal step size used by the notch filter. characteristic

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Embodiment Construction

[0065] Adaptive notch filters advantageously improve the amount of interference of a particular type removed from an input signal to produce a signal of interest. The input signal received by the adaptive notch filter includes a first signal component and a second signal component. The adaptive notch filter selectively filters one of the first component or the second component from the input signal to produce a target signal including components of the input signal not filtered out by the adaptive notch filter. In the following, the first signal component is used to describe the signal of interest and the second signal component is used to refer to external disturbances on the input signal. This is for exemplary purposes only, and one of ordinary skill in the art will recognize that the second signal component may include a signal of interest while the first signal component may include interference. The first signal component represents the signal of interest and may be form...

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Abstract

A patient monitoring device and method that determines and monitors at least one patient parameter is provided. A configuration processor generates configuration information in response to a first input signal and an adaptive notch filter receives a second input signal. The second input signal includes a signal of interest and an interference signal in a predetermined frequency range. The adaptive notch filter automatically estimates the interference signal within the second input signal based on a filter parameter and removes the estimated interference signal from the second input signal to generate a target signal. A step processor is electrically coupled between the configuration processor and the adaptive notch filter and sets a value of the filter parameter based on the configuration information, wherein the adaptive notch filter uses the filter parameter to reduce a ringing artifact on the target signal below a threshold level.

Description

technical field [0001] The present invention relates generally to apparatus and methods for reducing interfering signals among sensed patient physiological signals in patient monitoring devices, and more particularly to adaptive notch filters for minimizing electrocardiogram (ECG) ringing in patient monitoring devices. Background technique [0002] When providing healthcare to a patient, it is often important to accurately monitor at least one parameter related to the patient. To do this, at least one sensor is connected to the patient for use in sensing physiological signals provided to and interpreted by at least one patient monitoring device. The sensed physiological signal is used in determining at least one patient parameter. Poor quality sensed signals (eg, interference from external sources) negatively impact the patient monitoring device's ability to determine desired patient parameters, resulting in inaccurate patient parameter data values. Another problem associa...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/04A61B5/0428A61B5/308A61B5/366
CPCH04B1/109A61B5/7203A61B5/316A61B5/30A61B5/366
Inventor 郑玲陈宇
Owner DRAGERWERK AG
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