NL245570A - - Google Patents

Info

Publication number
NL245570A
NL245570A NL245570DA NL245570A NL 245570 A NL245570 A NL 245570A NL 245570D A NL245570D A NL 245570DA NL 245570 A NL245570 A NL 245570A
Authority
NL
Netherlands
Application number
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.)
Publication of NL245570A publication Critical patent/NL245570A/xx

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M9/00Arrangements for interconnection not involving centralised switching
    • H04M9/08Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M9/00Arrangements for interconnection not involving centralised switching
    • H04M9/08Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
    • H04M9/10Two-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)
  • Interface Circuits In Exchanges (AREA)
  • Telephone Function (AREA)
NL245570D 1958-12-29 NL245570A (US07122603-20061017-C00294.png)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US783417A US3046354A (en) 1958-12-29 1958-12-29 Loud speaking telephone

Publications (1)

Publication Number Publication Date
NL245570A true NL245570A (US07122603-20061017-C00294.png)

Family

ID=25129182

Family Applications (2)

Application Number Title Priority Date Filing Date
NL125146D NL125146C (US07122603-20061017-C00294.png) 1958-12-29
NL245570D NL245570A (US07122603-20061017-C00294.png) 1958-12-29

Family Applications Before (1)

Application Number Title Priority Date Filing Date
NL125146D NL125146C (US07122603-20061017-C00294.png) 1958-12-29

Country Status (8)

Country Link
US (1) US3046354A (US07122603-20061017-C00294.png)
JP (1) JPS376174B1 (US07122603-20061017-C00294.png)
BE (1) BE584516A (US07122603-20061017-C00294.png)
DE (1) DE1168494B (US07122603-20061017-C00294.png)
ES (1) ES254492A1 (US07122603-20061017-C00294.png)
FR (1) FR1244666A (US07122603-20061017-C00294.png)
GB (1) GB928597A (US07122603-20061017-C00294.png)
NL (2) NL245570A (US07122603-20061017-C00294.png)

Families Citing this family (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3136864A (en) * 1959-10-05 1964-06-09 Automatic Elect Lab Loudspeaking telephone with electronic voice switching
NL254433A (US07122603-20061017-C00294.png) * 1960-08-01
US3146313A (en) * 1961-06-08 1964-08-25 Ericsson Telefon Ab L M Amplifier arrangement for loudspeaking telephones
GB979825A (en) * 1962-03-09 1965-01-06 Gylling & Co Ab Amplifier for two way speech transmission
FR1327879A (fr) * 1962-04-11 1963-05-24 Neophone France Liaison téléphonique bilatérale munie d'un dispositif de blocage de la voie au repos
US3238302A (en) * 1962-07-05 1966-03-01 Fanon Electronic Ind Inc Intercommunication system
US3271519A (en) * 1962-11-09 1966-09-06 Executone Inf Sys Inc Volume control circuit
US3283074A (en) * 1962-12-31 1966-11-01 Gen Electric Voice-controlled communication system
GB1029163A (en) * 1964-05-29 1966-05-11 Standard Telephones Cables Ltd Improvements in or relating to telephone sets
SE306351B (US07122603-20061017-C00294.png) * 1964-08-14 1968-11-25 Standard Radio & Telefon
US3423531A (en) * 1965-08-16 1969-01-21 Itt Voice controlled amplifier
US3440356A (en) * 1965-09-22 1969-04-22 Automatic Elect Lab Automatically compensating telephone substation
DE1281499B (de) * 1966-03-23 1968-10-31 Siemens Ag Schaltungsanordnung fuer sprachgesteuerte Freisprechgeraete mit veraenderbarem Daempfungshub
DE1282720B (de) * 1966-03-23 1968-11-14 Siemens Ag Schaltungsanordnung fuer sprachgesteuerte Freisprechgeraete
US3437758A (en) * 1966-07-29 1969-04-08 Bell Telephone Labor Inc Conference telephone system
DE1298572B (de) * 1967-03-17 1969-07-03 Siemens Ag Gegen- oder Wechselsprechanlage
FR2102614A5 (US07122603-20061017-C00294.png) * 1970-08-06 1972-04-07 Barok Albert
US3860756A (en) * 1973-03-23 1975-01-14 Nitsuko Ltd Automatic voice-path switching circuit for a speaker phone telephone set
US3889059A (en) * 1973-03-26 1975-06-10 Northern Electric Co Loudspeaking communication terminal apparatus and method of operation
US3909548A (en) * 1973-12-07 1975-09-30 Jacobson Sava Speaker telephone
US4008376A (en) * 1975-10-17 1977-02-15 Bell Telephone Laboratories, Incorporated Loudspeaking teleconferencing circuit
FR2376576A1 (fr) * 1976-12-31 1978-07-28 Girard J Philippe Perfectionnements aux postes telephoniques a mains libres
US4378603A (en) * 1980-12-23 1983-03-29 Motorola, Inc. Radiotelephone with hands-free operation

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL46308C (US07122603-20061017-C00294.png) * 1935-09-19
DE890062C (de) * 1936-10-14 1953-09-17 Siemens Ag Schaltungsanordnung zur Verhinderung der elektroakustischen Rueckkopplung, insbesondere in Lautfernsprechanlagen
US2332430A (en) * 1942-07-16 1943-10-19 Bell Telephone Labor Inc Two-way telephone system
US2370388A (en) * 1943-04-01 1945-02-27 Clyde W Baird Communication system
AT193950B (de) * 1954-02-24 1957-12-10 Svenska Relaefabriken Ab Automatisch geregelte Zweiwegverstärker, vorzugsweise für Telephonanlagen mit Lautsprechertelephonen, wie Cheftelephonanlagen u. dgl.
GB839975A (en) * 1955-07-28 1960-06-29 Telephone Mfg Co Ltd Improvements in and relating to signal switched telecommunication circuits

Also Published As

Publication number Publication date
ES254492A1 (es) 1960-04-01
GB928597A (en) 1963-06-12
DE1168494B (de) 1964-04-23
US3046354A (en) 1962-07-24
NL125146C (US07122603-20061017-C00294.png)
BE584516A (fr) 1960-03-01
FR1244666A (fr) 1960-10-28
JPS376174B1 (US07122603-20061017-C00294.png) 1962-06-27

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