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GB1161002A - Improvements in and relating to Hearing Aids - Google Patents

Improvements in and relating to Hearing Aids

Info

Publication number
GB1161002A
GB1161002A GB5353266A GB5353266A GB1161002A GB 1161002 A GB1161002 A GB 1161002A GB 5353266 A GB5353266 A GB 5353266A GB 5353266 A GB5353266 A GB 5353266A GB 1161002 A GB1161002 A GB 1161002A
Authority
GB
United Kingdom
Prior art keywords
resistor
compression
amplifier
feedback circuit
diodes
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
GB5353266A
Inventor
Clifford Adolph Nygard
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.)
Royal Industries Co Ltd
Royal Industries Inc
Original Assignee
Royal Industries Co Ltd
Royal Industries Inc
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 Royal Industries Co Ltd, Royal Industries Inc filed Critical Royal Industries Co Ltd
Publication of GB1161002A publication Critical patent/GB1161002A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G7/00—Volume compression or expansion in amplifiers
    • H03G7/06—Volume compression or expansion in amplifiers having semiconductor devices
    • H03G7/08—Volume compression or expansion in amplifiers having semiconductor devices incorporating negative feedback
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G7/00—Volume compression or expansion in amplifiers
    • H03G7/001—Volume compression or expansion in amplifiers without controlling loop
    • 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
    • H04R25/35—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception using translation techniques
    • H04R25/356—Amplitude, e.g. amplitude shift or compression
    • 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
    • H04R25/50—Customised settings for obtaining desired overall acoustical characteristics
    • H04R25/502—Customised settings for obtaining desired overall acoustical characteristics using analog signal processing

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Neurosurgery (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)

Abstract

1,161,002. Nonlinear circuits. ROYAL INDUSTRIES Inc. 30 Nov., 1966 [21 Feb., 1966], No. 53532/66. Heading G4G. [Also in Division H4] A hearing aid comprises microphone 10, preamplifier 11 and volume control 13 capacitance coupled to output transducer 14 through a curvilinear compression amplifier 12 comprising transistor 15 having a logarithmic feedback circuit, wherein the collector and base are inter-connected by resistor 18 in parallel with a resistor 21 in series with capacitor 24 and parallel oppositely connected diodes 22, 23; resistor 21 being proportioned for linear amplification up to a predetermined level, above which the diodes progressively conduct and impose increasing feedback on the amplifier, so that the overall response is one of curvilinear compression (Fig. 3, not shown). In a modification (Fig. 2, not shown), the degree of compression is made adjustable by energizing the feedback circuit through an adjustable potentiometer.
GB5353266A 1966-02-21 1966-11-30 Improvements in and relating to Hearing Aids Expired GB1161002A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US52907466A 1966-02-21 1966-02-21

Publications (1)

Publication Number Publication Date
GB1161002A true GB1161002A (en) 1969-08-13

Family

ID=24108421

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5353266A Expired GB1161002A (en) 1966-02-21 1966-11-30 Improvements in and relating to Hearing Aids

Country Status (3)

Country Link
DE (1) DE1487399A1 (en)
FR (1) FR1513655A (en)
GB (1) GB1161002A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2167823A1 (en) * 1972-01-08 1973-08-24 Akai Electric
FR2276756A1 (en) * 1974-06-24 1976-01-23 Audibel Automatic level control for microphone amplifier - uses series transistor with its base polarisation varying with output
FR2416610A2 (en) * 1978-02-07 1979-08-31 Audibel Hearing aid signal correction device - has transistor collector-emitter shunt resistor to reduce transfer resistance and increase input signal range
GB2152785A (en) * 1982-05-28 1985-08-07 British Broadcasting Corp Headphone level protection circuit
GB2224413A (en) * 1988-10-28 1990-05-02 Andrew David Patrick Godfrey Electronic hearing aid
EP0392312A1 (en) * 1989-04-14 1990-10-17 Siemens Audiologische Technik GmbH Amplifier for hearing aid

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2167823A1 (en) * 1972-01-08 1973-08-24 Akai Electric
FR2276756A1 (en) * 1974-06-24 1976-01-23 Audibel Automatic level control for microphone amplifier - uses series transistor with its base polarisation varying with output
FR2416610A2 (en) * 1978-02-07 1979-08-31 Audibel Hearing aid signal correction device - has transistor collector-emitter shunt resistor to reduce transfer resistance and increase input signal range
GB2152785A (en) * 1982-05-28 1985-08-07 British Broadcasting Corp Headphone level protection circuit
GB2224413A (en) * 1988-10-28 1990-05-02 Andrew David Patrick Godfrey Electronic hearing aid
GB2224413B (en) * 1988-10-28 1993-01-13 Andrew David Patrick Godfrey Electronic hearing aid
EP0392312A1 (en) * 1989-04-14 1990-10-17 Siemens Audiologische Technik GmbH Amplifier for hearing aid

Also Published As

Publication number Publication date
DE1487399A1 (en) 1969-04-03
FR1513655A (en) 1968-02-16

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Legal Events

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