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AU5096985A - Acoustic signal attenuator - Google Patents

Acoustic signal attenuator

Info

Publication number
AU5096985A
AU5096985A AU50969/85A AU5096985A AU5096985A AU 5096985 A AU5096985 A AU 5096985A AU 50969/85 A AU50969/85 A AU 50969/85A AU 5096985 A AU5096985 A AU 5096985A AU 5096985 A AU5096985 A AU 5096985A
Authority
AU
Australia
Prior art keywords
acoustic signal
signal attenuator
attenuator
acoustic
signal
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.)
Abandoned
Application number
AU50969/85A
Inventor
Warrack Andrew
Lambe John Charles
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
Priority claimed from GB848429664A external-priority patent/GB8429664D0/en
Application filed by Individual filed Critical Individual
Publication of AU5096985A publication Critical patent/AU5096985A/en
Abandoned 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
    • H03G3/34—Muting amplifier when no signal is present or when only weak signals are present, or caused by the presence of noise signals, e.g. squelch systems
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B3/00—Audible signalling systems; Audible personal calling systems
    • G08B3/10—Audible signalling systems; Audible personal calling systems using electric transmission; using electromagnetic transmission
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/82—Line monitoring circuits for call progress or status discrimination

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Circuit For Audible Band Transducer (AREA)
AU50969/85A 1984-11-23 1985-11-21 Acoustic signal attenuator Abandoned AU5096985A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB848429664A GB8429664D0 (en) 1984-11-23 1984-11-23 Acoustic sound attenuator
GB8429664 1984-11-23
GB8524934 1985-10-09
GB858524934A GB8524934D0 (en) 1984-11-23 1985-10-09 Acoustic signal attenuator

Publications (1)

Publication Number Publication Date
AU5096985A true AU5096985A (en) 1986-06-18

Family

ID=26288491

Family Applications (1)

Application Number Title Priority Date Filing Date
AU50969/85A Abandoned AU5096985A (en) 1984-11-23 1985-11-21 Acoustic signal attenuator

Country Status (3)

Country Link
EP (1) EP0203132A1 (en)
AU (1) AU5096985A (en)
WO (1) WO1986003353A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU606915B2 (en) * 1987-01-30 1991-02-21 Nec Corporation Volume control circuit for use in portable telephone or the like

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1000522A4 (en) * 1987-05-08 1989-01-17 Staar Sa Method and device warning affecting the transmission of information from a sound headphones source destination based on elements outside.
GB2211701A (en) * 1987-10-27 1989-07-05 Kevin Stanley Fuller An audio frequency sensing switch
DE3740190A1 (en) * 1987-11-27 1989-06-08 Guenter Lang DEVICE FOR INFLUENCING ELECTRICAL DEVICES
WO1990009706A1 (en) * 1989-02-14 1990-08-23 In-Car Systems Limited Vehicle telephone apparatus
GB8903263D0 (en) * 1989-02-14 1989-04-05 Regent Communications Ltd Telephone accessory
JP2531263B2 (en) * 1989-04-24 1996-09-04 日本電気株式会社 Wireless selective call receiver
FR2650467A1 (en) * 1989-07-27 1991-02-01 Aslan Hikmet Device making it possible, through a momentary automatic interruption, to ascertain the nature and origin of noise or exterior sound, while listening to any television set or hi-fi system with the aid of a headset
GR900100101A (en) * 1990-02-14 1994-03-31 In Car Systems Ltd Telephone set for vehicles
SE9102980L (en) * 1991-10-14 1993-04-15 Ericsson Ge Mobile Communicat DEVICE FOR SOUND LEVEL DISCONNECTION OR OPERATING ALERTS
US20040027490A1 (en) * 2002-08-09 2004-02-12 Koninklijke Philips Electronics N.V. Ring triggered mute
US7796024B2 (en) 2007-02-07 2010-09-14 Db Systems, Llc Automated multi-purpose alert system with sensory interrupts

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3046862A1 (en) * 1980-12-12 1982-06-16 Alois Dipl.-Ing. 8500 Nürnberg Jäger Safety volume control for car audio equipment - reduces volume when warning device emits audible signal
US4389543A (en) * 1980-12-18 1983-06-21 Martus Granirer Telephone-activated audio control circuit
JPS57104312A (en) * 1980-12-19 1982-06-29 Sony Corp Control device for sound volume of acoustic device
US4425477A (en) * 1982-02-08 1984-01-10 Paul Alan Magil & Associates Telephone line triggered attenuator
US4437018A (en) * 1982-12-06 1984-03-13 Manley Stephen C Audio component coupler

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU606915B2 (en) * 1987-01-30 1991-02-21 Nec Corporation Volume control circuit for use in portable telephone or the like

Also Published As

Publication number Publication date
WO1986003353A1 (en) 1986-06-05
EP0203132A1 (en) 1986-12-03

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