FR2413859A7 - Incremental differentiator including sampling circuit - compares successive samples to determine derivative relative to time - Google Patents

Incremental differentiator including sampling circuit - compares successive samples to determine derivative relative to time

Info

Publication number
FR2413859A7
FR2413859A7 FR7739612A FR7739612A FR2413859A7 FR 2413859 A7 FR2413859 A7 FR 2413859A7 FR 7739612 A FR7739612 A FR 7739612A FR 7739612 A FR7739612 A FR 7739612A FR 2413859 A7 FR2413859 A7 FR 2413859A7
Authority
FR
France
Prior art keywords
incremental
input
time
successive samples
sampling circuit
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.)
Expired
Application number
FR7739612A
Other languages
French (fr)
Inventor
Charles Rouaud
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.)
Compagnie Generale de Radiologie SA
Original Assignee
Compagnie Generale de Radiologie SA
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
Application filed by Compagnie Generale de Radiologie SA filed Critical Compagnie Generale de Radiologie SA
Priority to FR7739612A priority Critical patent/FR2413859A7/en
Application granted granted Critical
Publication of FR2413859A7 publication Critical patent/FR2413859A7/en
Expired 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
    • A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
    • A61B5/316—Modalities, i.e. specific diagnostic methods
    • A61B5/318—Heart-related electrical modalities, e.g. electrocardiography [ECG]
    • A61B5/346—Analysis of electrocardiograms
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06G—ANALOGUE COMPUTERS
    • G06G7/00—Devices in which the computing operation is performed by varying electric or magnetic quantities
    • G06G7/12—Arrangements for performing computing operations, e.g. operational amplifiers
    • G06G7/18—Arrangements for performing computing operations, e.g. operational amplifiers for integration or differentiation; for forming integrals
    • G06G7/184—Arrangements for performing computing operations, e.g. operational amplifiers for integration or differentiation; for forming integrals using capacitive elements
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
    • A61B5/316—Modalities, i.e. specific diagnostic methods
    • 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
    • A61B5/7235—Details of waveform analysis
    • A61B5/7239—Details of waveform analysis using differentiation including higher order derivatives

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Health & Medical Sciences (AREA)
  • Pathology (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • Biophysics (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Mathematical Physics (AREA)
  • Theoretical Computer Science (AREA)
  • Cardiology (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Physiology (AREA)
  • Psychiatry (AREA)
  • Signal Processing (AREA)
  • Artificial Intelligence (AREA)
  • Software Systems (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Processing Of Color Television Signals (AREA)

Abstract

The incremental differentiator circuit receives a signal (e), a function of time (t) and provides a first derivative (de/dt). The input supplies a sample-and -hold circuit including an electronic switch controlled by a square wave signal at the sampling frequency (fs) provided by a clock. An analogue store holds samples of the input amplitude. This is connected to an operational amplifier having a gain of one. The input also supplies one of the inputs of the difference circuit, the second input being provided by the operational amplifier. The output of the difference circuit provides a signal indicative of the difference between successive samples. By low pass filtering and interpolation the first derivative. (de/dt) is produced.
FR7739612A 1977-12-29 1977-12-29 Incremental differentiator including sampling circuit - compares successive samples to determine derivative relative to time Expired FR2413859A7 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7739612A FR2413859A7 (en) 1977-12-29 1977-12-29 Incremental differentiator including sampling circuit - compares successive samples to determine derivative relative to time

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7739612A FR2413859A7 (en) 1977-12-29 1977-12-29 Incremental differentiator including sampling circuit - compares successive samples to determine derivative relative to time

Publications (1)

Publication Number Publication Date
FR2413859A7 true FR2413859A7 (en) 1979-07-27

Family

ID=9199475

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7739612A Expired FR2413859A7 (en) 1977-12-29 1977-12-29 Incremental differentiator including sampling circuit - compares successive samples to determine derivative relative to time

Country Status (1)

Country Link
FR (1) FR2413859A7 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1133001A (en) * 1955-06-27 1957-03-20 Ile Eca Soc Civ Method and devices for obtaining the derivative of a variable function and the applications of these devices
US2947480A (en) * 1956-10-15 1960-08-02 Hazeltine Research Inc Electrical differentiator
US3448255A (en) * 1965-10-06 1969-06-03 Us Army Time derivative computer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1133001A (en) * 1955-06-27 1957-03-20 Ile Eca Soc Civ Method and devices for obtaining the derivative of a variable function and the applications of these devices
US2947480A (en) * 1956-10-15 1960-08-02 Hazeltine Research Inc Electrical differentiator
US3448255A (en) * 1965-10-06 1969-06-03 Us Army Time derivative computer

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
NV8029/74 *
NV8032/77 *

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