GB1440910A - Telephone amplifiers - Google Patents

Telephone amplifiers

Info

Publication number
GB1440910A
GB1440910A GB1540572A GB1540572A GB1440910A GB 1440910 A GB1440910 A GB 1440910A GB 1540572 A GB1540572 A GB 1540572A GB 1540572 A GB1540572 A GB 1540572A GB 1440910 A GB1440910 A GB 1440910A
Authority
GB
United Kingdom
Prior art keywords
telephone amplifiers
amplifiers
telephone
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
GB1540572A
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.)
FOOT V A
Original Assignee
FOOT V A
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 FOOT V A filed Critical FOOT V A
Priority to GB1540572A priority Critical patent/GB1440910A/en
Publication of GB1440910A publication Critical patent/GB1440910A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/21—Combinations with auxiliary equipment, e.g. with clocks or memoranda pads
    • H04M1/215—Combinations with auxiliary equipment, e.g. with clocks or memoranda pads by non-intrusive coupling means, e.g. acoustic couplers
    • H04M1/2155—Acoustic coupling
    • 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
    • H04M1/62—Constructional arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
GB1540572A 1972-04-04 1972-04-04 Telephone amplifiers Expired GB1440910A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1540572A GB1440910A (en) 1972-04-04 1972-04-04 Telephone amplifiers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1540572A GB1440910A (en) 1972-04-04 1972-04-04 Telephone amplifiers

Publications (1)

Publication Number Publication Date
GB1440910A true GB1440910A (en) 1976-06-30

Family

ID=10058568

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1540572A Expired GB1440910A (en) 1972-04-04 1972-04-04 Telephone amplifiers

Country Status (1)

Country Link
GB (1) GB1440910A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2232848A (en) * 1989-04-13 1990-12-19 Plantronics Battery powered in-line amplifier
EP0604049A2 (en) * 1992-12-21 1994-06-29 AT&T Corp. Acoustic coupling apparatus for telephone handsets
GB2483308A (en) * 2010-09-06 2012-03-07 Jack Kemp Docking device with pickup coil coupled to electromagnetic transducer

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2232848A (en) * 1989-04-13 1990-12-19 Plantronics Battery powered in-line amplifier
GB2232848B (en) * 1989-04-13 1993-12-08 Plantronics Audio signal amplifying apparatus
EP0604049A2 (en) * 1992-12-21 1994-06-29 AT&T Corp. Acoustic coupling apparatus for telephone handsets
EP0604049A3 (en) * 1992-12-21 1999-02-17 AT&T Corp. Acoustic coupling apparatus for telephone handsets
GB2483308A (en) * 2010-09-06 2012-03-07 Jack Kemp Docking device with pickup coil coupled to electromagnetic transducer

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees