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 timeInfo
- 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
Links
- 238000005070 sampling Methods 0.000 title abstract 2
- 238000001914 filtration Methods 0.000 abstract 1
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.
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)
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 |
-
1977
- 1977-12-29 FR FR7739612A patent/FR2413859A7/en not_active Expired
Patent Citations (3)
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)
Title |
---|
NV8029/74 * |
NV8032/77 * |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |