GB1360227A - Telephone sets - Google Patents

Telephone sets

Info

Publication number
GB1360227A
GB1360227A GB3582171A GB3582171A GB1360227A GB 1360227 A GB1360227 A GB 1360227A GB 3582171 A GB3582171 A GB 3582171A GB 3582171 A GB3582171 A GB 3582171A GB 1360227 A GB1360227 A GB 1360227A
Authority
GB
United Kingdom
Prior art keywords
bridge
transformers
alternately
loud
square wave
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
GB3582171A
Other languages
English (en)
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 GB1360227A publication Critical patent/GB1360227A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Circuit For Audible Band Transducer (AREA)
GB3582171A 1970-08-06 1971-07-29 Telephone sets Expired GB1360227A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7029610A FR2102614A5 (https=) 1970-08-06 1970-08-06

Publications (1)

Publication Number Publication Date
GB1360227A true GB1360227A (en) 1974-07-17

Family

ID=9060098

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3582171A Expired GB1360227A (en) 1970-08-06 1971-07-29 Telephone sets

Country Status (8)

Country Link
US (1) US3787621A (https=)
BE (1) BE770227A (https=)
CA (1) CA976287A (https=)
CH (1) CH546524A (https=)
DE (1) DE2136313A1 (https=)
ES (1) ES393619A1 (https=)
FR (1) FR2102614A5 (https=)
GB (1) GB1360227A (https=)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2314631A1 (fr) * 1975-06-11 1977-01-07 Jeumont Schneider Procede et dispositif d'elimination de l'effet local d'un poste telephonique
FR2376576A1 (fr) * 1976-12-31 1978-07-28 Girard J Philippe Perfectionnements aux postes telephoniques a mains libres
JPS5489403A (en) * 1977-12-27 1979-07-16 Matsushita Electric Ind Co Ltd Signal control circuit
DE3213968C2 (de) * 1982-04-16 1984-06-14 Deutsche Fernsprecher Gesellschaft Mbh Marburg, 3550 Marburg Fernsprechapparat
US4715062A (en) * 1985-03-22 1987-12-22 Tie/Communications, Inc. Speakerphone control circuit having low gain states and method for controlling gain of speakerphone
FI78373C (fi) * 1988-01-18 1989-07-10 Sostel Oy Telefontrafik- eller dataoeverfoeringssystem.
US5020101A (en) * 1989-04-10 1991-05-28 Gregory R. Brotz Musicians telephone interface

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL245570A (https=) * 1958-12-29
US3594507A (en) * 1969-10-22 1971-07-20 William T Clark Feedback eliminating device for audio amplifying systems
US3665106A (en) * 1970-04-28 1972-05-23 Research Corp Intercommunication system

Also Published As

Publication number Publication date
CH546524A (fr) 1974-02-28
BE770227A (fr) 1971-12-01
DE2136313A1 (de) 1972-02-10
US3787621A (en) 1974-01-22
FR2102614A5 (https=) 1972-04-07
ES393619A1 (es) 1974-07-01
CA976287A (en) 1975-10-14

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee