GB2013051A - Gain control in telecommunications systems - Google Patents

Gain control in telecommunications systems

Info

Publication number
GB2013051A
GB2013051A GB7902087A GB7902087A GB2013051A GB 2013051 A GB2013051 A GB 2013051A GB 7902087 A GB7902087 A GB 7902087A GB 7902087 A GB7902087 A GB 7902087A GB 2013051 A GB2013051 A GB 2013051A
Authority
GB
United Kingdom
Prior art keywords
gain control
microphone
amplitude
decrease
control circuit
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.)
Withdrawn
Application number
GB7902087A
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.)
UK Secretary of State for Defence
Original Assignee
UK Secretary of State for Defence
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 UK Secretary of State for Defence filed Critical UK Secretary of State for Defence
Priority to GB7902087A priority Critical patent/GB2013051A/en
Publication of GB2013051A publication Critical patent/GB2013051A/en
Withdrawn legal-status Critical Current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
    • H03G3/32—Automatic control in amplifiers having semiconductor devices the control being dependent upon ambient noise level or sound level

Landscapes

  • Control Of Amplification And Gain Control (AREA)

Abstract

A telecommunication system has a microphone 1 connected to a telecommunications receiver via a gain control circuit 8 which is arranged to vary the amplitude of the receiver output in accordance with ambient acoustic noise generated signals from the microphone. Preferably the gain control circuit is arranged to increase or decrease the amplitude of the receiver output by approximately 0.5 dB per 1 dB increase, or decrease, respectively in the acoustic noise generated signal from the microphone. A compressed signal from compressor 2 is fullwave rectified at 9 and averaged by a resistor and a capacitor 6 to provide the gain control signal. The system is useful in acoustically noisy environments such as military aircraft crew compartments. <IMAGE>
GB7902087A 1978-01-20 1979-01-19 Gain control in telecommunications systems Withdrawn GB2013051A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7902087A GB2013051A (en) 1978-01-20 1979-01-19 Gain control in telecommunications systems

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB240778 1978-01-20
GB7902087A GB2013051A (en) 1978-01-20 1979-01-19 Gain control in telecommunications systems

Publications (1)

Publication Number Publication Date
GB2013051A true GB2013051A (en) 1979-08-01

Family

ID=26237504

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7902087A Withdrawn GB2013051A (en) 1978-01-20 1979-01-19 Gain control in telecommunications systems

Country Status (1)

Country Link
GB (1) GB2013051A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2207313A (en) * 1987-07-18 1989-01-25 James Melville Buick Signal controlled by noise signal compensator
US6529605B1 (en) 2000-04-14 2003-03-04 Harman International Industries, Incorporated Method and apparatus for dynamic sound optimization
US7302062B2 (en) 2004-03-19 2007-11-27 Harman Becker Automotive Systems Gmbh Audio enhancement system
US8116481B2 (en) 2005-05-04 2012-02-14 Harman Becker Automotive Systems Gmbh Audio enhancement system
US8170221B2 (en) 2005-03-21 2012-05-01 Harman Becker Automotive Systems Gmbh Audio enhancement system and method
US8571855B2 (en) 2004-07-20 2013-10-29 Harman Becker Automotive Systems Gmbh Audio enhancement system

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2207313A (en) * 1987-07-18 1989-01-25 James Melville Buick Signal controlled by noise signal compensator
US6529605B1 (en) 2000-04-14 2003-03-04 Harman International Industries, Incorporated Method and apparatus for dynamic sound optimization
US7302062B2 (en) 2004-03-19 2007-11-27 Harman Becker Automotive Systems Gmbh Audio enhancement system
US8571855B2 (en) 2004-07-20 2013-10-29 Harman Becker Automotive Systems Gmbh Audio enhancement system
US8170221B2 (en) 2005-03-21 2012-05-01 Harman Becker Automotive Systems Gmbh Audio enhancement system and method
US8116481B2 (en) 2005-05-04 2012-02-14 Harman Becker Automotive Systems Gmbh Audio enhancement system
US9014386B2 (en) 2005-05-04 2015-04-21 Harman Becker Automotive Systems Gmbh Audio enhancement system

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)