CA2105682A1 - Signal processing apparatus and method - Google Patents

Signal processing apparatus and method

Info

Publication number
CA2105682A1
CA2105682A1 CA002105682A CA2105682A CA2105682A1 CA 2105682 A1 CA2105682 A1 CA 2105682A1 CA 002105682 A CA002105682 A CA 002105682A CA 2105682 A CA2105682 A CA 2105682A CA 2105682 A1 CA2105682 A1 CA 2105682A1
Authority
CA
Canada
Prior art keywords
signal
undesired
processor
portions
correlated
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002105682A
Other languages
French (fr)
Other versions
CA2105682C (en
Inventor
Mohamed K. Diab
Esmaiel Kiani-Azarbayjany
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Masimo Corp
Original Assignee
Mohamed K. Diab
Esmaiel Kiani-Azarbayjany
Vital Signals, Inc.
Masimo Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=24672658&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=CA2105682(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Mohamed K. Diab, Esmaiel Kiani-Azarbayjany, Vital Signals, Inc., Masimo Corporation filed Critical Mohamed K. Diab
Publication of CA2105682A1 publication Critical patent/CA2105682A1/en
Application granted granted Critical
Publication of CA2105682C publication Critical patent/CA2105682C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/145—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue
    • A61B5/1455—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue using optical sensors, e.g. spectral photometrical oximeters
    • A61B5/14551—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue using optical sensors, e.g. spectral photometrical oximeters for measuring blood gases
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
    • A61B5/7203—Signal processing specially adapted for physiological signals or for diagnostic purposes for noise prevention, reduction or removal
    • A61B5/7207—Signal processing specially adapted for physiological signals or for diagnostic purposes for noise prevention, reduction or removal of noise induced by motion artifacts
    • A61B5/7214—Signal processing specially adapted for physiological signals or for diagnostic purposes for noise prevention, reduction or removal of noise induced by motion artifacts using signal cancellation, e.g. based on input of two identical physiological sensors spaced apart, or based on two signals derived from the same sensor, for different optical wavelengths
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
    • A61B5/7228—Signal modulation applied to the input signal sent to patient or subject; demodulation to recover the physiological signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/12—Neutralising, balancing, or compensation arrangements
    • H04B1/123—Neutralising, balancing, or compensation arrangements using adaptive balancing or compensation means
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2218/00—Aspects of pattern recognition specially adapted for signal processing
    • G06F2218/02—Preprocessing
    • G06F2218/04—Denoising

Abstract

A signal processor which acquires a first signal (S?a), including a first desired signal portion (Y?a) and a first undesired signal portion (n?a), and a second signal (S?b), including a second desired signal portion (Y?b) and a second undesired signal portion (n?b), wherein the first and second desired signal portions are correlated. The processor (26) of the present invention gen-erates a noise reference signal (n'(t)) which is a combination of only the undesired signal portions and is correlated to both the first and second undesired signal portions. The noise reference signal (n'(t)) is then used to remove the undesired portion of each of the first and second measured signals via an adaptive noise canceler (27), preferably of the joint process estimator type. The processor (26) may be employed in conjunction with an adaptive noise canceler (27) in physiological monitors (20) wherein the known properties of energy attenuation through a medium are used to determine physiological characteristics of the medium.
CA002105682A 1991-03-07 1992-03-05 Signal processing apparatus and method Expired - Lifetime CA2105682C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US66606091A 1991-03-07 1991-03-07
US666,060 1991-03-07
PCT/US1992/001895 WO1992015955A1 (en) 1991-03-07 1992-03-05 Signal processing apparatus and method

Publications (2)

Publication Number Publication Date
CA2105682A1 true CA2105682A1 (en) 1992-09-08
CA2105682C CA2105682C (en) 2003-09-02

Family

ID=24672658

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002105682A Expired - Lifetime CA2105682C (en) 1991-03-07 1992-03-05 Signal processing apparatus and method

Country Status (9)

Country Link
US (8) US5482036A (en)
EP (3) EP1357481A3 (en)
JP (1) JP3363150B2 (en)
AT (1) ATE184716T1 (en)
AU (1) AU658177B2 (en)
CA (1) CA2105682C (en)
DE (1) DE69229994T2 (en)
RU (1) RU2144211C1 (en)
WO (1) WO1992015955A1 (en)

Families Citing this family (818)

* Cited by examiner, † Cited by third party
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RU2144211C1 (en) 2000-01-10
EP0930045A3 (en) 1999-10-27
JPH06507485A (en) 1994-08-25
AU658177B2 (en) 1995-04-06
US20030097049A1 (en) 2003-05-22
US20040204638A1 (en) 2004-10-14
EP0574509B1 (en) 1999-09-15
US6036642A (en) 2000-03-14
DE69229994T2 (en) 2000-04-27
JP3363150B2 (en) 2003-01-08
EP1357481A3 (en) 2005-04-27
US5769785A (en) 1998-06-23
US6206830B1 (en) 2001-03-27
USRE38492E1 (en) 2004-04-06
AU1536992A (en) 1992-10-06
US6826419B2 (en) 2004-11-30
EP0574509A1 (en) 1993-12-22
WO1992015955A1 (en) 1992-09-17
CA2105682C (en) 2003-09-02
ATE184716T1 (en) 1999-10-15
DE69229994D1 (en) 1999-10-21
US6501975B2 (en) 2002-12-31
US5482036A (en) 1996-01-09
EP0574509A4 (en) 1996-07-31
EP0930045A2 (en) 1999-07-21
EP1357481A2 (en) 2003-10-29

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