GB1489062A - Signal converter - Google Patents

Signal converter

Info

Publication number
GB1489062A
GB1489062A GB20229/74A GB2022974A GB1489062A GB 1489062 A GB1489062 A GB 1489062A GB 20229/74 A GB20229/74 A GB 20229/74A GB 2022974 A GB2022974 A GB 2022974A GB 1489062 A GB1489062 A GB 1489062A
Authority
GB
United Kingdom
Prior art keywords
amplitude
input signal
frequency
amplifier
modulated
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
GB20229/74A
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.)
Res & Dev Scientists Inc
Original Assignee
Res & Dev Scientists Inc
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 Res & Dev Scientists Inc filed Critical Res & Dev Scientists Inc
Priority to GB20229/74A priority Critical patent/GB1489062A/en
Priority to DE19752520383 priority patent/DE2520383A1/en
Priority to FR7514312A priority patent/FR2270715B1/fr
Priority to JP50055289A priority patent/JPS5115960A/ja
Publication of GB1489062A publication Critical patent/GB1489062A/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
    • A61B5/30—Input circuits therefor
    • A61B5/307—Input circuits therefor specially adapted for particular uses
    • A61B5/308—Input circuits therefor specially adapted for particular uses for electrocardiography [ECG]
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C5/00—Amplitude modulation and angle modulation produced simultaneously or at will by the same modulating signal
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
    • A61B5/024—Detecting, measuring or recording pulse rate or heart rate
    • 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
    • A61B5/30—Input circuits therefor

Abstract

1489062 Improved physiological signal processing RESEARCH & DEVELOPMENT SCIENTISTS Inc 7 May 1975 [8 May 1974] 20229/74 Heading GIN(E) A physiological waveform e.g. E.E.G., E.C.G., pulse pressure or heart beats &c. is used as an input signal to frequency modulate a carrier wave which is then amplitude modulated by the absolute value of the input signal. The input signal from the patient is amplified by a variable gain input amplifier 10 and passed via a switch unit 12 to a frequency modulating circuit 18 and an amplitude modulating circuit 20. The two circuits 18, 20 control a relaxation oscillator 22 producing a frequency and/or amplitude which is modulated in accordance with variations in the amplitude of the input signal depending upon the positions of switches 14 and 16. The output of the oscillator is then fed via an amplifier 24 to a loud-speaker 26 and/or an oscilloscope. Further more detailed examples of signal converter circuits are disclosed, Figs. 3 and 4 (not shown).
GB20229/74A 1974-05-08 1974-05-08 Signal converter Expired GB1489062A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
GB20229/74A GB1489062A (en) 1974-05-08 1974-05-08 Signal converter
DE19752520383 DE2520383A1 (en) 1974-05-08 1975-05-07 SIGNAL CONVERTER
FR7514312A FR2270715B1 (en) 1974-05-08 1975-05-07
JP50055289A JPS5115960A (en) 1974-05-08 1975-05-08

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB20229/74A GB1489062A (en) 1974-05-08 1974-05-08 Signal converter

Publications (1)

Publication Number Publication Date
GB1489062A true GB1489062A (en) 1977-10-19

Family

ID=10142519

Family Applications (1)

Application Number Title Priority Date Filing Date
GB20229/74A Expired GB1489062A (en) 1974-05-08 1974-05-08 Signal converter

Country Status (4)

Country Link
JP (1) JPS5115960A (en)
DE (1) DE2520383A1 (en)
FR (1) FR2270715B1 (en)
GB (1) GB1489062A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2447547A (en) * 2007-03-12 2008-09-17 Gen Electric Method And System For Patient Evaluation Using An Electrocardiogram

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106656307B (en) * 2016-12-09 2020-01-21 清华大学 Unmanned aerial vehicle flight limitation management method based on frequency modulation data broadcasting, unmanned aerial vehicle and management center

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2447547A (en) * 2007-03-12 2008-09-17 Gen Electric Method And System For Patient Evaluation Using An Electrocardiogram
GB2447547B (en) * 2007-03-12 2012-02-22 Gen Electric Method and system for patient evaluation

Also Published As

Publication number Publication date
FR2270715A1 (en) 1975-12-05
DE2520383A1 (en) 1975-11-20
JPS5115960A (en) 1976-02-07
FR2270715B1 (en) 1980-08-29

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee