Signal filtering and signal processing apparatus and method

Patent metadata

Field	Value
Publication number	US-10826544-B2
Application number	US-202016733617-A
Country	US
Kind code	B2
Filing date	Jan 3, 2020
Priority date	Dec 9, 2015
Publication date	Nov 3, 2020
Grant date	Nov 3, 2020

Abstract

A signal processing method, a signal filtering apparatus, and a signal processing apparatus are provided. An input signal may be input into a filter having a passband, a superfluous signal of the passband may be output from the filter, and a target signal may be obtained by subtracting the superfluous signal from the input signal.

First claim

What is claimed is:

1. A photoplethysmogram (PPG) signal processing method, comprising:
obtaining a PPG signal through a biosignal sensor;
generating an input signal by subtracting a DC offset from the PPG signal;
inputting the input signal to a first processing path and a second processing path, wherein the first processing path comprises a low pass filter that has a cutoff frequency and the second processing path comprises a delay compensator configured to compensate for a time delay related to the low pass filter; and
obtaining a target signal by subtracting a signal obtained from the first processing path from a signal obtained from the second processing path.

2. The method of claim 1 , wherein the target signal has a frequency higher than 0.3 hz.

3. The method of claim 1 , wherein the target signal has a frequency lower than 50 hz.

4. A wearable device, comprising:
a sensor configured to measure a PPG signal; and
a signal processing apparatus comprising:
an adder-subtractor configured to generate a input signal by subtracting a DC offset from the measured PPG signal, and configured to input the input signal to a first processing path and a second processing path;
a low pass filter disposed in the first processing path, and configured to have a cutoff frequency;
a delay compensator disposed in the second processing path, and configured to compensate for a time delay related to the low pass filter; and
a subtractor configured to obtain a target signal by subtracting a signal obtained from the first processing path from a signal obtained from the second processing path.

5. The wearable device of claim 4 , wherein the target signal has a frequency higher than 0.3 hz.

6. The wearable device of claim 4 , wherein the target signal has a frequency lower than 50 hz.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Kwon Ui Kun
• Park Chang Soon
• Yoon Seungkeun
• Kim Sang Joon
• Lee Jaechun
• Choi Changmok

Classifications

• A61B5/7225 Primary

  Details of analogue processing, e.g. isolation amplifier, gain or sensitivity adjustment, filtering, baseline or drift compensation (input circuits for detecting, measuring, or recording bioelectric or biomagnetic signals A61B5/30; specific diagnostic methods using bioelectric or biomagnetic signals A61B5/316) · CPC title

• A61B5/7203

  for noise prevention, reduction or removal · CPC title

• A61B5/6813

  Specially adapted to be attached to a specific body part (A61B5/6802 takes precedence) · CPC title

• A61B5/30

  Input circuits therefor · CPC title

• H04L25/061 Primary

  providing hard decisions only; arrangements for tracking or suppressing unwanted low frequency components, e.g. removal of DC offset (removal of DC offset in coupling arrangements H04L25/029, H04L25/0296) · CPC title