GB1316631A - Hearing aids - Google Patents

Hearing aids

Info

Publication number
GB1316631A
GB1316631A GB2637870A GB2637870A GB1316631A GB 1316631 A GB1316631 A GB 1316631A GB 2637870 A GB2637870 A GB 2637870A GB 2637870 A GB2637870 A GB 2637870A GB 1316631 A GB1316631 A GB 1316631A
Authority
GB
United Kingdom
Prior art keywords
diodes
hearing aid
amplifier
stage
output
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
GB2637870A
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
Priority claimed from DE19691927848 external-priority patent/DE1927848C3/en
Application filed by Siemens AG filed Critical Siemens AG
Publication of GB1316631A publication Critical patent/GB1316631A/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
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Neurosurgery (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Control Of Amplification And Gain Control (AREA)
  • Amplifiers (AREA)

Abstract

1316631 Automatic gain control; hearing aid circuits SIEMENS AG 1 June 1970 [31 May 1969] 26378/70 Headings H4J and H4R Hearing aid amplifier has a.g.c. applied by a potentiometer, including resistor 9 and diodes 20, 21, in the input of one of the final stages of the amplifier. The impedance of the diodes is controlled by varying the D.C. bias current passed through the diodes by transistor 23 in accordance with the signal level appearing at the output of the stage. The stage output is rectified by the voltage doubler rectifier, formed by diodes 30, 31, which is returned to a potential stabilized by diode 32.
GB2637870A 1969-05-31 1970-06-01 Hearing aids Expired GB1316631A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691927848 DE1927848C3 (en) 1969-05-31 Hearing aid

Publications (1)

Publication Number Publication Date
GB1316631A true GB1316631A (en) 1973-05-09

Family

ID=5735760

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2637870A Expired GB1316631A (en) 1969-05-31 1970-06-01 Hearing aids

Country Status (5)

Country Link
AT (1) AT302432B (en)
CH (1) CH505526A (en)
DK (1) DK124579B (en)
GB (1) GB1316631A (en)
NL (1) NL7005570A (en)

Also Published As

Publication number Publication date
AT302432B (en) 1972-10-10
DE1927848A1 (en) 1970-12-03
NL7005570A (en) 1970-12-02
DE1927848B2 (en) 1975-06-19
CH505526A (en) 1971-03-31
DK124579B (en) 1972-10-30

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees