GB1373840A - Microphone for simultaneously monitoring heart pulse and heart noise - Google Patents

Microphone for simultaneously monitoring heart pulse and heart noise

Info

Publication number
GB1373840A
GB1373840A GB6018672A GB6018672A GB1373840A GB 1373840 A GB1373840 A GB 1373840A GB 6018672 A GB6018672 A GB 6018672A GB 6018672 A GB6018672 A GB 6018672A GB 1373840 A GB1373840 A GB 1373840A
Authority
GB
United Kingdom
Prior art keywords
housing
heart
apertures
microphone
cavities
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
GB6018672A
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of GB1373840A publication Critical patent/GB1373840A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • 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]
    • A61B5/332—Portable devices specially adapted therefor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B7/00—Instruments for auscultation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
    • H04R1/04—Structural association of microphone with electric circuitry therefor

Abstract

1373840 Stethoscopic microphone SIEMENS AG 29 Dec 1972 [29 Dec 1971] 60186/72 Heading H4J A microphone, particularly for monitoring heart pulse and heart noise, comprises a housing 5, 7, in which a piezoelectric element 1 is mounted, the element being carried on a support 3 which divides the housing into two cavities. Apertures 11 are provided through the housing wall to permit communication between an elastic medium, e.g. air, filling one of the cavities with the same elastic medium outside the housing. The second cavity is also filled with an elastic medium. The cavity volumes and the apertures are so dimensioned as to damp the crystal and enhance the response to heart pulse and heart noise. As described the piezo electric element 1 is encapsulated in the elastic material of the support 3, and a circuit plate 17 with apertures 19 is mounted in one of the cavities while an apertured plate 25 is mounted between the support 3 and the housing apertures 11 to obstruct the direct path and protect the element from damage. An electrocardiograph electrode 23 is provided on the face of the housing and the housing and connecting lead 21 are screened. The transducer 41, Fig. 2, is connected in series with a capacitor 42 to form a capacitive divider so that the fundamental of the heart pulse is emphasized in the signal fed out via the impedance transformer 35 while the transducer is connected in a differentiating circuit with resistor 46 to emphasize the heart noise component which is applied to the output via a high pass filter comprising capacitor 43 and resistor 45.
GB6018672A 1971-12-29 1972-12-29 Microphone for simultaneously monitoring heart pulse and heart noise Expired GB1373840A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE16811/71A SE367300B (en) 1971-12-29 1971-12-29

Publications (1)

Publication Number Publication Date
GB1373840A true GB1373840A (en) 1974-11-13

Family

ID=20302803

Family Applications (1)

Application Number Title Priority Date Filing Date
GB6018672A Expired GB1373840A (en) 1971-12-29 1972-12-29 Microphone for simultaneously monitoring heart pulse and heart noise

Country Status (4)

Country Link
FR (1) FR2165963B1 (en)
GB (1) GB1373840A (en)
IT (1) IT979669B (en)
SE (1) SE367300B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6336367B1 (en) 1998-01-29 2002-01-08 B-Band Oy Vibration transducer unit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6336367B1 (en) 1998-01-29 2002-01-08 B-Band Oy Vibration transducer unit

Also Published As

Publication number Publication date
FR2165963A1 (en) 1973-08-10
FR2165963B1 (en) 1978-03-03
DE2259496B2 (en) 1975-10-30
DE2259496A1 (en) 1973-07-12
IT979669B (en) 1974-09-30
SE367300B (en) 1974-05-20

Similar Documents

Publication Publication Date Title
GB1363550A (en) Electro-acoustic transducer device
GB1035080A (en) Piezoelectric tuned coupling element and method of making same
CA1007355A (en) Ultrasonic transducer mounting and coupling assembly
GB1347235A (en) Variable capacitance displacement transducers
US4104628A (en) High output audible alarm device utilizing a piezoelectric transducer and voltage doubling means
ES401268A1 (en) Ferro-electric transformers with means to supress or limit resonant vibrations
GB1445220A (en) Microphone
GB1498140A (en) Square wave generating circuit
US6275448B1 (en) Pressure-compensated acceleration-insensitive hydrophone
US3027540A (en) Hydrophone with spaced electromechanical ceramic elements
GB1373840A (en) Microphone for simultaneously monitoring heart pulse and heart noise
FR2469928B1 (en)
US2564562A (en) Microphone
US3176681A (en) Method for digital pulse detection
JPS5940798A (en) Noise reduction device of microphone
GB1031145A (en) Improvements in or relating to audio-frequency amplifiers
Mashimo et al. An Instrumental Aspect of Apexcardiography Decay Characteristic of Transducers and Its Clinical Implication
GB1421624A (en) Transducer
US3812456A (en) A hydro-acoustic filter
GB1205735A (en) Transducer
AT303416B (en) Electrical circuit for transmitting and amplifying the signals of a piezoelectric transducer
FR2349253A1 (en) Electroacoustic transducer covering full acoustic range - has homogeneous transmission of vibration through fluid from active element to passive membrane
GB1209360A (en) Arrangement for producing artificial reverberation
GB1515080A (en) Electromechanical filters
CH535952A (en) Piezoelectric unit, consisting of a piezoelectric transducer and an amplifier connected to it

Legal Events

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