GB1150430A - Device for Listening-In to Noises in a Room - Google Patents

Device for Listening-In to Noises in a Room

Info

Publication number
GB1150430A
GB1150430A GB27223/66A GB2722366A GB1150430A GB 1150430 A GB1150430 A GB 1150430A GB 27223/66 A GB27223/66 A GB 27223/66A GB 2722366 A GB2722366 A GB 2722366A GB 1150430 A GB1150430 A GB 1150430A
Authority
GB
United Kingdom
Prior art keywords
ringing
microphone
relay
loud
subset
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
GB27223/66A
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.)
Agfa Gevaert AG
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 GB1150430A publication Critical patent/GB1150430A/en
Expired legal-status Critical Current

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)
GB27223/66A 1965-06-19 1966-06-17 Device for Listening-In to Noises in a Room Expired GB1150430A (en)

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
GB1150430A true GB1150430A (en) 1969-04-30

Family

ID=25964199

Family Applications (1)

Application Number Title Priority Date Filing Date
GB27223/66A Expired GB1150430A (en) 1965-06-19 1966-06-17 Device for Listening-In to Noises in a Room

Country Status (4)

Country Link
US (1) US3530250A (cg-RX-API-DMAC7.html)
BE (1) BE682766A (cg-RX-API-DMAC7.html)
CH (1) CH440381A (cg-RX-API-DMAC7.html)
GB (1) GB1150430A (cg-RX-API-DMAC7.html)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5640147A (en) * 1996-01-16 1997-06-17 Chek; Lawrence Child monitoring device

Families Citing this family (10)

* 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
US4716582A (en) * 1983-04-27 1987-12-29 Phonetics, Inc. Digital and synthesized speech alarm system
US4558181A (en) * 1983-04-27 1985-12-10 Phonetics, Inc. Portable device for monitoring local area
US4527015A (en) * 1983-12-05 1985-07-02 Chambers Colin T Security listening system
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 (cg-RX-API-DMAC7.html) * 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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5640147A (en) * 1996-01-16 1997-06-17 Chek; Lawrence Child monitoring device

Also Published As

Publication number Publication date
CH440381A (de) 1967-07-31
BE682766A (cg-RX-API-DMAC7.html) 1966-12-01
US3530250A (en) 1970-09-22

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees