GB669412A - Improvements in or relating to impulse-responding circuits for use in telephone or like signalling systems - Google Patents

Improvements in or relating to impulse-responding circuits for use in telephone or like signalling systems

Info

Publication number
GB669412A
GB669412A GB771449A GB771449A GB669412A GB 669412 A GB669412 A GB 669412A GB 771449 A GB771449 A GB 771449A GB 771449 A GB771449 A GB 771449A GB 669412 A GB669412 A GB 669412A
Authority
GB
United Kingdom
Prior art keywords
impulse
responding
telephone
relating
relay
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
GB771449A
Inventor
Eric Bertram Ireland
Douglas Austin Read
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.)
Automatic Telephone and Electric Co Ltd
Original Assignee
Automatic Telephone and Electric Co 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 Automatic Telephone and Electric Co Ltd filed Critical Automatic Telephone and Electric Co Ltd
Priority to GB771449A priority Critical patent/GB669412A/en
Publication of GB669412A publication Critical patent/GB669412A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/442—Signalling arrangements; Manipulation of signalling currents using alternate current with out-of-voice band signalling frequencies
    • H04Q1/4423—Signalling arrangements; Manipulation of signalling currents using alternate current with out-of-voice band signalling frequencies using one signalling frequency

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Relay Circuits (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

669,412. Automatic exchange systems. AUTOMATIC TELEPHONE & ELECTRIC CO., Ltd. March 9, 1950 [March 22, 1949], No. 7714/49. Class 40 (iv). [Also in Group XL (b)] In an A.C. impulse-responding circuit, the retarding effect produced by a rectifier network MRA on the release of the impulsing relay J is compensated by energizing an opposed winding of J prior to its release. The first impulse produces sluggish operation of relay J due to the current drain to the equipment ahead. Thus, in a modification, during each operation of the impulsing relay after the first its second winding is shunted so causing its operating time to be constant irrespective of the particular impulse to which it is responding.
GB771449A 1949-03-22 1949-03-22 Improvements in or relating to impulse-responding circuits for use in telephone or like signalling systems Expired GB669412A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB771449A GB669412A (en) 1949-03-22 1949-03-22 Improvements in or relating to impulse-responding circuits for use in telephone or like signalling systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB771449A GB669412A (en) 1949-03-22 1949-03-22 Improvements in or relating to impulse-responding circuits for use in telephone or like signalling systems

Publications (1)

Publication Number Publication Date
GB669412A true GB669412A (en) 1952-04-02

Family

ID=9838341

Family Applications (1)

Application Number Title Priority Date Filing Date
GB771449A Expired GB669412A (en) 1949-03-22 1949-03-22 Improvements in or relating to impulse-responding circuits for use in telephone or like signalling systems

Country Status (1)

Country Link
GB (1) GB669412A (en)

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