GB1233578A - - Google Patents

Info

Publication number
GB1233578A
GB1233578A GB1233578DA GB1233578A GB 1233578 A GB1233578 A GB 1233578A GB 1233578D A GB1233578D A GB 1233578DA GB 1233578 A GB1233578 A GB 1233578A
Authority
GB
United Kingdom
Prior art keywords
white noise
pass filter
power amplifier
unfiltered
switch
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
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 filed Critical
Publication of GB1233578A publication Critical patent/GB1233578A/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
    • A61B5/12—Audiometering
    • A61B5/121—Audiometering evaluating hearing capacity

Abstract

1,233,578. Audiometers. P. VEIT, G. H. BIZAGUET, and A. UBERSFELD. 9 Sept., 1968 [8 Sept., 1967], No. 42719/68. Heading H4J. An audiometer comprises a white noise generator 13, and a switch 2b for selecting, as desired, unfiltered white noise or white noise filtered by a high pass filter 14, a band pass filter 15 or a low pass filter 16. A power amplifier 12 amplifies the unfiltered or filtered white noise signals. A loud-speaker 7 adapted to be held in the hand is connected to the output of the power amplifier 12 through a manually controlled switch 9. A battery 11 in the audiometer case 1 energizes the various circuits. The outputs of the filters 14, 15, 16 are connected to the battery negative terminal through calibration potentiometers 17, 18, 19. A calibration potentiometer 21 is for the unfiltered white signal. The output from the power amplifier 12 is adjustable by an attenuator 22. The switch 9 in the inoperative condition short-circuits the amplifier input to reduce current consumption. A pilot light 4 is provided.
GB1233578D 1967-09-08 1968-09-09 Expired GB1233578A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR120432 1967-09-08

Publications (1)

Publication Number Publication Date
GB1233578A true GB1233578A (en) 1971-05-26

Family

ID=8638014

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1233578D Expired GB1233578A (en) 1967-09-08 1968-09-09

Country Status (3)

Country Link
DE (1) DE1791076C3 (en)
FR (1) FR1602891A (en)
GB (1) GB1233578A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005096940A1 (en) * 2004-04-08 2005-10-20 Philip Stuart Esnouf A hearing testing device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2719796B2 (en) * 1977-05-03 1979-03-08 Siemens Ag, 1000 Berlin Und 8000 Muenchen Audiometer

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005096940A1 (en) * 2004-04-08 2005-10-20 Philip Stuart Esnouf A hearing testing device
EP1791468A1 (en) * 2004-04-08 2007-06-06 Philip Stuart Esnouf A hearing testing device
EP1791468A4 (en) * 2004-04-08 2008-01-02 Philip Stuart Esnouf A hearing testing device

Also Published As

Publication number Publication date
DE1791076A1 (en) 1971-10-21
DE1791076B2 (en) 1979-04-05
DE1791076C3 (en) 1981-09-03
FR1602891A (en) 1971-02-08

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee