AT308862B - Hearing aid - Google Patents

Hearing aid

Info

Publication number
AT308862B
AT308862B AT421072A AT421072A AT308862B AT 308862 B AT308862 B AT 308862B AT 421072 A AT421072 A AT 421072A AT 421072 A AT421072 A AT 421072A AT 308862 B AT308862 B AT 308862B
Authority
AT
Austria
Prior art keywords
hearing aid
hearing
aid
Prior art date
Application number
AT421072A
Other languages
German (de)
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
Application granted granted Critical
Publication of AT308862B publication Critical patent/AT308862B/en

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers
    • H03G3/301—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers the gain being continuously variable
    • H03G3/3015—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers the gain being continuously variable using diodes or transistors
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/181—Low frequency amplifiers, e.g. audio preamplifiers
    • H03F3/183—Low frequency amplifiers, e.g. audio preamplifiers with semiconductor devices only
    • 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
AT421072A 1971-07-16 1972-05-15 Hearing aid AT308862B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712135684 DE2135684A1 (en) 1971-07-16 1971-07-16 HOERGERAET

Publications (1)

Publication Number Publication Date
AT308862B true AT308862B (en) 1973-07-25

Family

ID=5813950

Family Applications (1)

Application Number Title Priority Date Filing Date
AT421072A AT308862B (en) 1971-07-16 1972-05-15 Hearing aid

Country Status (3)

Country Link
AT (1) AT308862B (en)
DE (1) DE2135684A1 (en)
NL (1) NL7205579A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5144675A (en) * 1990-03-30 1992-09-01 Etymotic Research, Inc. Variable recovery time circuit for use with wide dynamic range automatic gain control for hearing aid
US5680466A (en) * 1994-10-06 1997-10-21 Zelikovitz; Joseph Omnidirectional hearing aid

Also Published As

Publication number Publication date
NL7205579A (en) 1973-01-18
DE2135684A1 (en) 1973-01-25

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Legal Events

Date Code Title Description
ELJ Ceased due to non-payment of the annual fee