GB2218594B - Induction loop driving amplifiers - Google Patents

Induction loop driving amplifiers

Info

Publication number
GB2218594B
GB2218594B GB8906162A GB8906162A GB2218594B GB 2218594 B GB2218594 B GB 2218594B GB 8906162 A GB8906162 A GB 8906162A GB 8906162 A GB8906162 A GB 8906162A GB 2218594 B GB2218594 B GB 2218594B
Authority
GB
United Kingdom
Prior art keywords
induction loop
loop driving
driving amplifiers
amplifiers
induction
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 - Lifetime
Application number
GB8906162A
Other versions
GB8906162D0 (en
GB2218594A (en
Inventor
Leon Andre Pieters
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
Publication of GB8906162D0 publication Critical patent/GB8906162D0/en
Publication of GB2218594A publication Critical patent/GB2218594A/en
Application granted granted Critical
Publication of GB2218594B publication Critical patent/GB2218594B/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H04R27/00—Public address systems
    • H04R27/02—Amplifying systems for the deaf
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
    • 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
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G5/00—Tone control or bandwidth control in amplifiers
    • H03G5/16—Automatic control
    • H03G5/18—Automatic control in untuned amplifiers
    • 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
    • H04R25/55—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception using an external connection, either wireless or wired
    • H04R25/554—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception using an external connection, either wireless or wired using a wireless connection, e.g. between microphone and amplifier or using Tcoils

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)
GB8906162A 1988-03-18 1989-03-17 Induction loop driving amplifiers Expired - Lifetime GB2218594B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB888806434A GB8806434D0 (en) 1988-03-18 1988-03-18 Current-driving amplifiers

Publications (3)

Publication Number Publication Date
GB8906162D0 GB8906162D0 (en) 1989-05-04
GB2218594A GB2218594A (en) 1989-11-15
GB2218594B true GB2218594B (en) 1992-08-26

Family

ID=10633655

Family Applications (2)

Application Number Title Priority Date Filing Date
GB888806434A Pending GB8806434D0 (en) 1988-03-18 1988-03-18 Current-driving amplifiers
GB8906162A Expired - Lifetime GB2218594B (en) 1988-03-18 1989-03-17 Induction loop driving amplifiers

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB888806434A Pending GB8806434D0 (en) 1988-03-18 1988-03-18 Current-driving amplifiers

Country Status (4)

Country Link
AU (1) AU3299889A (en)
DK (1) DK224890D0 (en)
GB (2) GB8806434D0 (en)
WO (1) WO1989008970A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7756279B2 (en) 2003-10-14 2010-07-13 Audioasics A/S Microphone preamplifier
FI125489B (en) 2014-01-03 2015-10-30 Telesilmukka Oy Controller for induction loop system
GB2526630B (en) * 2014-05-30 2016-05-04 Contacta Systems Ltd Amplifier for induction loop
GB2543364B (en) * 2015-10-16 2018-06-27 Contacta Systems Ltd Induction loop circuit

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0077688A1 (en) * 1981-10-20 1983-04-27 Craigwell Industries Limited Improvements in or relating to hearing aids
GB2184629A (en) * 1985-12-10 1987-06-24 Colin David Rickson Compensation of hearing
EP0237203A2 (en) * 1986-03-12 1987-09-16 Beltone Electronics Corporation Hearing aid circuit

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3621151A (en) * 1969-10-15 1971-11-16 Grt Corp Frequency selective audio limiter
US3668322A (en) * 1970-06-18 1972-06-06 Columbia Broadcasting Syst Inc Dynamic presence equalizer
US4287477A (en) * 1979-02-22 1981-09-01 Dynamic Compliance, Incorporated Feedback arrangement
DE3415319A1 (en) * 1984-04-25 1985-10-31 ANT Nachrichtentechnik GmbH, 7150 Backnang Alternating-voltage amplifier

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0077688A1 (en) * 1981-10-20 1983-04-27 Craigwell Industries Limited Improvements in or relating to hearing aids
GB2184629A (en) * 1985-12-10 1987-06-24 Colin David Rickson Compensation of hearing
EP0237203A2 (en) * 1986-03-12 1987-09-16 Beltone Electronics Corporation Hearing aid circuit

Also Published As

Publication number Publication date
AU3299889A (en) 1989-10-05
DK224890A (en) 1990-09-18
GB8906162D0 (en) 1989-05-04
GB8806434D0 (en) 1988-04-20
WO1989008970A1 (en) 1989-09-21
GB2218594A (en) 1989-11-15
DK224890D0 (en) 1990-09-18

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Legal Events

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

Effective date: 20070317