FR2202630A7 - - Google Patents

Info

Publication number
FR2202630A7
FR2202630A7 FR7335775A FR7335775A FR2202630A7 FR 2202630 A7 FR2202630 A7 FR 2202630A7 FR 7335775 A FR7335775 A FR 7335775A FR 7335775 A FR7335775 A FR 7335775A FR 2202630 A7 FR2202630 A7 FR 2202630A7
Authority
FR
France
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
FR7335775A
Other languages
French (fr)
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.)
GFELLER AG APPARATE FABRIK
Original Assignee
GFELLER AG APPARATE FABRIK
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 GFELLER AG APPARATE FABRIK filed Critical GFELLER AG APPARATE FABRIK
Application granted granted Critical
Publication of FR2202630A7 publication Critical patent/FR2202630A7/fr
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
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/40—Arrangements for obtaining a desired directivity characteristic
    • H04R25/402—Arrangements for obtaining a desired directivity characteristic using contructional means
    • 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
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/34—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means
    • H04R1/38—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means in which sound waves act upon both sides of a diaphragm and incorporating acoustic phase-shifting means, e.g. pressure-gradient microphone
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2300/00—Orthogonal indexing scheme relating to electric switches, relays, selectors or emergency protective devices covered by H01H
    • H01H2300/004—Application hearing aid
FR7335775A 1972-10-07 1973-10-05 Expired FR2202630A7 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722249303 DE2249303A1 (en) 1972-10-07 1972-10-07 Hearing aid for the severely handicapped or severely handicapped

Publications (1)

Publication Number Publication Date
FR2202630A7 true FR2202630A7 (en) 1974-05-03

Family

ID=5858474

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7335775A Expired FR2202630A7 (en) 1972-10-07 1973-10-05

Country Status (3)

Country Link
CH (1) CH558997A (en)
DE (1) DE2249303A1 (en)
FR (1) FR2202630A7 (en)

Also Published As

Publication number Publication date
DE2249303A1 (en) 1974-04-18
CH558997A (en) 1975-02-14

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Legal Events

Date Code Title Description
ST Notification of lapse