GB1367707A - Loudspeaking telephone - Google Patents

Loudspeaking telephone

Info

Publication number
GB1367707A
GB1367707A GB5604972A GB5604972A GB1367707A GB 1367707 A GB1367707 A GB 1367707A GB 5604972 A GB5604972 A GB 5604972A GB 5604972 A GB5604972 A GB 5604972A GB 1367707 A GB1367707 A GB 1367707A
Authority
GB
United Kingdom
Prior art keywords
loud
input
comparator
microphone
line
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
GB5604972A
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.)
Philips Electronics UK Ltd
Original Assignee
Philips Electronic and Associated Industries 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
Application filed by Philips Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB1367707A publication Critical patent/GB1367707A/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
    • H04M9/10—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic with switching of direction of transmission by voice frequency

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Polyamides (AREA)
  • Circuit For Audible Band Transducer (AREA)
GB5604972A 1971-12-08 1972-12-05 Loudspeaking telephone Expired GB1367707A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7116826A NL155700B (nl) 1971-12-08 1971-12-08 Luidsprekende telefooninrichting.

Publications (1)

Publication Number Publication Date
GB1367707A true GB1367707A (en) 1974-09-18

Family

ID=19814643

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5604972A Expired GB1367707A (en) 1971-12-08 1972-12-05 Loudspeaking telephone

Country Status (6)

Country Link
JP (1) JPS5331326B2 (de)
DE (1) DE2258415C3 (de)
FR (1) FR2164357A5 (de)
GB (1) GB1367707A (de)
NL (1) NL155700B (de)
NO (1) NO133988C (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2125657A (en) * 1980-03-17 1984-03-07 United Networks Inc Loudspeaker telephone system
GB2197166A (en) * 1986-11-07 1988-05-11 Storno As Controlling gain in speech-controlled telephones

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO134477C (de) * 1974-10-29 1976-10-13 Manus Max
JPS5824063B2 (ja) * 1977-11-14 1983-05-19 東亜特殊電機株式会社 拡声電話機
JPS5469308A (en) * 1977-11-14 1979-06-04 Toa Electric Co Ltd Audio switch
US4229625A (en) * 1978-12-29 1980-10-21 Bell Telephone Laboratories, Incorporated Repeater level control circuit
DE3034569C2 (de) * 1980-09-10 1983-10-27 Siemens AG, 1000 Berlin und 8000 München Sprachgesteuerte Lautfernsprechanlage
DD154419A1 (de) * 1980-12-23 1982-03-17 Helmut Kammholz Schaltungsanordnung fuer einen fernsprechapparat mit mithoer-und freisprecheinrichtung
FR2578127A1 (fr) * 1985-02-27 1986-08-29 Jeumont Schneider Procede et dispositif pour la commande d'un poste telephonique a main libre fonctionnant en alternat
FR2610772B2 (fr) * 1987-02-10 1989-04-28 Telephonie Ind Commerciale Dispositif anti-effet larsen pour poste telephonique

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2125657A (en) * 1980-03-17 1984-03-07 United Networks Inc Loudspeaker telephone system
GB2197166A (en) * 1986-11-07 1988-05-11 Storno As Controlling gain in speech-controlled telephones

Also Published As

Publication number Publication date
FR2164357A5 (de) 1973-07-27
DE2258415B2 (de) 1979-09-20
DE2258415A1 (de) 1973-06-14
DE2258415C3 (de) 1980-06-12
JPS5331326B2 (de) 1978-09-01
NL155700B (nl) 1978-01-16
JPS4866310A (de) 1973-09-11
NO133988B (de) 1976-04-20
NL7116826A (de) 1973-06-13
NO133988C (de) 1976-07-28

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Legal Events

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