GB363512A - Improvements relating to telephone instrument circuits - Google Patents

Improvements relating to telephone instrument circuits

Info

Publication number
GB363512A
GB363512A GB3916130A GB3916130A GB363512A GB 363512 A GB363512 A GB 363512A GB 3916130 A GB3916130 A GB 3916130A GB 3916130 A GB3916130 A GB 3916130A GB 363512 A GB363512 A GB 363512A
Authority
GB
United Kingdom
Prior art keywords
resistance
antiside
transformer
tone
circuits
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
GB3916130A
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.)
Siemens Brothers and Co Ltd
Original Assignee
Siemens Brothers and 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 Siemens Brothers and Co Ltd filed Critical Siemens Brothers and Co Ltd
Priority to GB3916130A priority Critical patent/GB363512A/en
Publication of GB363512A publication Critical patent/GB363512A/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
    • H04M1/58—Anti-side-tone circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

363,512. Su.b-station antiside-tone circuits. SIEMENS BROS. & CO., Ltd., Caxton House, Tothill Street, and WIGAN, E. R., 18, Cambridge Road, Lee, both in London. Dec. 30, 1930, No. 39161. [Class 40 (iv).] In an antiside-tone circuit of the type described in Specification 263,211, [Class 40 (iv), Telephones &c.], in which a transformer is connected across the transmitter and receiver, a resistance is added to the receiver circuit, the value of the resistance being equivalent to the resistance component of the line impedance with which the instrument is designed to operate. As shown in the Figure, M is the antiside-tone transformer, Sl and P1 the induction coil secondary and primary respectively and X is the added resistance. This resistance may be a separate unit which may be mounted with the condenser C to form a three-terminal unit, may be obtained by winding the induction coil secondary with resistance alloy wire or may be mounted on the bobbin of the transformer M to make a fiveterminal unit. Circuits using the invention with automatic type instruments are shown in the Specification, and, when used with such instruments, the resistance may be connected to prevent the transient voltages produced during dialling from tinkling the calling bell.
GB3916130A 1930-12-30 1930-12-30 Improvements relating to telephone instrument circuits Expired GB363512A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3916130A GB363512A (en) 1930-12-30 1930-12-30 Improvements relating to telephone instrument circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3916130A GB363512A (en) 1930-12-30 1930-12-30 Improvements relating to telephone instrument circuits

Publications (1)

Publication Number Publication Date
GB363512A true GB363512A (en) 1931-12-24

Family

ID=10408010

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3916130A Expired GB363512A (en) 1930-12-30 1930-12-30 Improvements relating to telephone instrument circuits

Country Status (1)

Country Link
GB (1) GB363512A (en)

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