FR2296397A1 - Machine for testing hearing level - has vocal and tonal circuits attenuating and filtering single frequency - Google Patents

Machine for testing hearing level - has vocal and tonal circuits attenuating and filtering single frequency

Info

Publication number
FR2296397A1
FR2296397A1 FR7443394A FR7443394A FR2296397A1 FR 2296397 A1 FR2296397 A1 FR 2296397A1 FR 7443394 A FR7443394 A FR 7443394A FR 7443394 A FR7443394 A FR 7443394A FR 2296397 A1 FR2296397 A1 FR 2296397A1
Authority
FR
France
Prior art keywords
tonal
vocal
attenuating
circuits
machine
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.)
Granted
Application number
FR7443394A
Other languages
French (fr)
Other versions
FR2296397B1 (en
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to FR7443394A priority Critical patent/FR2296397A1/en
Publication of FR2296397A1 publication Critical patent/FR2296397A1/en
Application granted granted Critical
Publication of FR2296397B1 publication Critical patent/FR2296397B1/fr
Granted 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

Abstract

The tonal circuit comprises pulses at stabilised frequency passing through a scaling-down circuit operating in cascade. Low pass filters are used, together with potentiometers, as a means of selecting the tones which are derived from the single input frequency of 48 kHz. The vocal circuit comprises a tape recorder (20), its output fed into a bank of six pass band filters (701 to 706) having a band width of one octave and scaled from 0.125 to 8 kHz. The filters are connected to logarithmic potentiometers (711 to 716) having linear displacement cursors. Their output through resistances (721 to 726) through a mixer amplifier (30) and an aperiodic attenuator (40) feeding a loudspeaker (50).
FR7443394A 1974-12-31 1974-12-31 Machine for testing hearing level - has vocal and tonal circuits attenuating and filtering single frequency Granted FR2296397A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7443394A FR2296397A1 (en) 1974-12-31 1974-12-31 Machine for testing hearing level - has vocal and tonal circuits attenuating and filtering single frequency

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7443394A FR2296397A1 (en) 1974-12-31 1974-12-31 Machine for testing hearing level - has vocal and tonal circuits attenuating and filtering single frequency

Publications (2)

Publication Number Publication Date
FR2296397A1 true FR2296397A1 (en) 1976-07-30
FR2296397B1 FR2296397B1 (en) 1982-10-01

Family

ID=9146805

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7443394A Granted FR2296397A1 (en) 1974-12-31 1974-12-31 Machine for testing hearing level - has vocal and tonal circuits attenuating and filtering single frequency

Country Status (1)

Country Link
FR (1) FR2296397A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4321427A (en) * 1979-09-18 1982-03-23 Sadanand Singh Apparatus and method for audiometric assessment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4321427A (en) * 1979-09-18 1982-03-23 Sadanand Singh Apparatus and method for audiometric assessment

Also Published As

Publication number Publication date
FR2296397B1 (en) 1982-10-01

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