CH440381A - Einrichtung zum Abhören von Geräuschen in einem Raum - Google Patents

Einrichtung zum Abhören von Geräuschen in einem Raum

Info

Publication number
CH440381A
CH440381A CH876266A CH876266A CH440381A CH 440381 A CH440381 A CH 440381A CH 876266 A CH876266 A CH 876266A CH 876266 A CH876266 A CH 876266A CH 440381 A CH440381 A CH 440381A
Authority
CH
Switzerland
Prior art keywords
noises
listening
room
Prior art date
Application number
CH876266A
Other languages
German (de)
English (en)
Inventor
Gustav Dr Schaum
Rudolf Dr Kremp
Johann Dipl Ing Becker
Fritz Dipl Phys Hieber
Hans-Peter Dipl Ing Huber
Original Assignee
Agfa Gevaert Ag
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 DE1965A0049529 external-priority patent/DE1233919B/de
Application filed by Agfa Gevaert Ag filed Critical Agfa Gevaert Ag
Publication of CH440381A publication Critical patent/CH440381A/de

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Telephonic Communication Services (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
CH876266A 1965-06-19 1966-06-17 Einrichtung zum Abhören von Geräuschen in einem Raum CH440381A (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1965A0049529 DE1233919B (de) 1965-06-19 1965-06-19 Einrichtung zum Abhoeren von Geraeuschen in einem Raum
DEA0052093 1966-04-06

Publications (1)

Publication Number Publication Date
CH440381A true CH440381A (de) 1967-07-31

Family

ID=25964199

Family Applications (1)

Application Number Title Priority Date Filing Date
CH876266A CH440381A (de) 1965-06-19 1966-06-17 Einrichtung zum Abhören von Geräuschen in einem Raum

Country Status (4)

Country Link
US (1) US3530250A (en:Method)
BE (1) BE682766A (en:Method)
CH (1) CH440381A (en:Method)
GB (1) GB1150430A (en:Method)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE29499E (en) * 1970-10-13 1977-12-20 Reliance Telecommunication Electronics Company On premise telephone loop tester
US3723656B1 (en) * 1971-04-12 1991-04-30 Telephone answering system
US3746790A (en) * 1971-05-27 1973-07-17 C Ault Automatic telephone interface device
US3814870A (en) * 1972-09-19 1974-06-04 Western Electric Co Telephone subscriber line terminating test circuit
US4031329A (en) * 1974-06-13 1977-06-21 International Telephone And Telegraph Corporation Time limited telephone paging employs a relay switch actuated by dual frequency tone
US3902016A (en) * 1974-06-28 1975-08-26 Int Mobile Machines Ringer blocking attachment for telephones
US4558181A (en) * 1983-04-27 1985-12-10 Phonetics, Inc. Portable device for monitoring local area
US4716582A (en) * 1983-04-27 1987-12-29 Phonetics, Inc. Digital and synthesized speech alarm system
US4527015A (en) * 1983-12-05 1985-07-02 Chambers Colin T Security listening system
US5640147A (en) * 1996-01-16 1997-06-17 Chek; Lawrence Child monitoring device
US6483897B1 (en) 1997-12-29 2002-11-19 David Millrod Method and apparatus for answering a telephone with speech

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2542535A (en) * 1948-06-14 1951-02-20 Kaelin Pierre Device for automatically diverting telephone calls
US2539139A (en) * 1949-07-14 1951-01-23 Jordaphone Corp Of America Telephone system for automatic answering, recording messages, and recording normal conversations
US2854512A (en) * 1951-04-30 1958-09-30 Electronic Secretary Ind Inc Close coupled telephone answering and message recording device
BE539848A (en:Method) * 1954-07-16
US2909614A (en) * 1954-09-27 1959-10-20 Louis E Goyette Automatic resetting apparatus
US2898405A (en) * 1955-07-13 1959-08-04 George H Eck Listening device
US2826636A (en) * 1956-01-27 1958-03-11 Donald C Beatty Sound amplifying apparatus for telephone and like circuits
US3038965A (en) * 1959-01-22 1962-06-12 Michael J Civitano Telephone signal device and the like

Also Published As

Publication number Publication date
US3530250A (en) 1970-09-22
GB1150430A (en) 1969-04-30
BE682766A (en:Method) 1966-12-01

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