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GB2166015B - Headphones - Google Patents

Headphones

Info

Publication number
GB2166015B
GB2166015B GB08515175A GB8515175A GB2166015B GB 2166015 B GB2166015 B GB 2166015B GB 08515175 A GB08515175 A GB 08515175A GB 8515175 A GB8515175 A GB 8515175A GB 2166015 B GB2166015 B GB 2166015B
Authority
GB
United Kingdom
Prior art keywords
headphones
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
GB08515175A
Other versions
GB2166015A (en
GB8515175D0 (en
Inventor
Dr Roger Charles Driscoll
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.)
ROSS MARKS Ltd
Original Assignee
ROSS MARKS Ltd
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 GB848425253A external-priority patent/GB8425253D0/en
Application filed by ROSS MARKS Ltd filed Critical ROSS MARKS Ltd
Priority to GB08515175A priority Critical patent/GB2166015B/en
Publication of GB8515175D0 publication Critical patent/GB8515175D0/en
Publication of GB2166015A publication Critical patent/GB2166015A/en
Application granted granted Critical
Publication of GB2166015B publication Critical patent/GB2166015B/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H03G3/3026—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers the gain being discontinuously variable, e.g. controlled by switching
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G11/00—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
    • H04M1/6033—Substation equipment, e.g. for use by subscribers including speech amplifiers for providing handsfree use or a loudspeaker mode in telephone sets

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Headphones And Earphones (AREA)
GB08515175A 1984-10-05 1985-06-14 Headphones Expired GB2166015B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08515175A GB2166015B (en) 1984-10-05 1985-06-14 Headphones

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB848425253A GB8425253D0 (en) 1984-10-05 1984-10-05 Headphones
GB08515175A GB2166015B (en) 1984-10-05 1985-06-14 Headphones

Publications (3)

Publication Number Publication Date
GB8515175D0 GB8515175D0 (en) 1985-07-17
GB2166015A GB2166015A (en) 1986-04-23
GB2166015B true GB2166015B (en) 1988-10-05

Family

ID=26288309

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08515175A Expired GB2166015B (en) 1984-10-05 1985-06-14 Headphones

Country Status (1)

Country Link
GB (1) GB2166015B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE59008542D1 (en) * 1990-07-25 1995-03-30 Siemens Audiologische Technik Hearing aid circuit with an output stage with a limiting device.
DK2403138T3 (en) 2010-06-25 2014-03-17 Sennheiser Comm As Self-powered audio compressor circuit

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB798549A (en) * 1954-01-22 1958-07-23 Fernseh Gmbh Improvements in and relating to electric amplifiers
GB875169A (en) * 1958-06-24 1961-08-16 British Telecomm Res Ltd Improvements in amplifiers
CH462894A (en) * 1966-09-29 1968-09-30 Eresa S A Automatic gain adjustment device of an audio amplifier
NL7307129A (en) * 1973-05-22 1974-11-26
FR2377132A1 (en) * 1977-01-11 1978-08-04 Labo Cent Telecommunicat PROTECTION DEVICE FOR ELECTRONIC JUNCTOR
US4135223A (en) * 1977-06-03 1979-01-16 Esquire, Inc. Electronic protection circuit
FR2522451B1 (en) * 1982-03-01 1988-10-14 Audibel IMPROVEMENT IN THE AUTOMATIC GAIN CONTROL CIRCUIT OF A TRANSISTOR AMPLIFICATION SYSTEM AND HEARING CORRECTION APPARATUS PROVIDED WITH SUCH A CIRCUIT

Also Published As

Publication number Publication date
GB2166015A (en) 1986-04-23
GB8515175D0 (en) 1985-07-17

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Legal Events

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