GB656922A - Improvements in and relating to devices on telephonographs for switching them off after completed reproduction - Google Patents

Improvements in and relating to devices on telephonographs for switching them off after completed reproduction

Info

Publication number
GB656922A
GB656922A GB10576/48A GB1057648A GB656922A GB 656922 A GB656922 A GB 656922A GB 10576/48 A GB10576/48 A GB 10576/48A GB 1057648 A GB1057648 A GB 1057648A GB 656922 A GB656922 A GB 656922A
Authority
GB
United Kingdom
Prior art keywords
relay
reproduction
impulses
telephonographs
relating
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
GB10576/48A
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.)
DAPHNE INVEST TRUST
Original Assignee
DAPHNE INVEST TRUST
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 DAPHNE INVEST TRUST filed Critical DAPHNE INVEST TRUST
Publication of GB656922A publication Critical patent/GB656922A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/64—Automatic arrangements for answering calls; Automatic arrangements for recording messages for absent subscribers; Arrangements for recording conversations
    • H04M1/65—Recording arrangements for recording a message from the calling party
    • H04M1/654—Telephone line monitoring circuits therefor, e.g. ring detectors

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

656,922. Substation equipment. DAPHNE INVESTMENT TRUST. April 16, 1948, No. 10576. Convention date, July 30, 1947. [Class 40 (iv)] A telephonograph is automatically switched off by electrical means after reproduction of the recorded messages. As shown, closure of a key JA19 energizes a relay H11 to operate a clutch K6 and to start a motor M13, thus initiating reproduction from a record TT7. Speech impulses are transmitted by a pick-up S4 through an amplifier WV3 to a subscriber Tl and also through a further amplifier GR8 to a slow-releasing relay J10, which operates to hold H11, the key JA19 being released. Short intervals between impulses are bridged with the aid of a condenser K09. When the speech impulses cease, relay J10 releases, followed by the rest of the equipment.
GB10576/48A 1947-07-30 1948-04-16 Improvements in and relating to devices on telephonographs for switching them off after completed reproduction Expired GB656922A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH656922X 1947-07-30

Publications (1)

Publication Number Publication Date
GB656922A true GB656922A (en) 1951-09-05

Family

ID=4526574

Family Applications (1)

Application Number Title Priority Date Filing Date
GB10576/48A Expired GB656922A (en) 1947-07-30 1948-04-16 Improvements in and relating to devices on telephonographs for switching them off after completed reproduction

Country Status (4)

Country Link
BE (1) BE484143A (en)
CH (1) CH259965A (en)
FR (1) FR969548A (en)
GB (1) GB656922A (en)

Also Published As

Publication number Publication date
BE484143A (en)
FR969548A (en) 1950-12-21
CH259965A (en) 1949-02-15

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