GB263211A - Improvements relating to telephone instrument circuits - Google Patents

Improvements relating to telephone instrument circuits

Info

Publication number
GB263211A
GB263211A GB2148325A GB2148325A GB263211A GB 263211 A GB263211 A GB 263211A GB 2148325 A GB2148325 A GB 2148325A GB 2148325 A GB2148325 A GB 2148325A GB 263211 A GB263211 A GB 263211A
Authority
GB
United Kingdom
Prior art keywords
transmitter
transformer
winding
induction coil
receiver
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
GB2148325A
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
Priority to FR599659D priority Critical patent/FR599659A/en
Application filed by Siemens Brothers and Co Ltd filed Critical Siemens Brothers and Co Ltd
Priority to GB2148325A priority patent/GB263211A/en
Publication of GB263211A publication Critical patent/GB263211A/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)
  • Selective Calling Equipment (AREA)

Abstract

263,211. Siemens Bros. & Co., Ltd., and Dutton, G. F. Aug. 27, 1925. Telephone systems. -For suppressing side-tone in a substation circuit comprising an induction coil PI, SI connected in the usual manner, an additional transformer M is provided having its secondary winding m2 across the receiver R and its primary winding w1 connected in series or parallel with the transmitter T. Current through the receiver due to an alteration of the transmitter resistance is thus neutralized by an opposing current induced through the transformer M. The winding ml should have a high ohmic resistance to prevent too much direct current being shunted from the transmitter. Suitable winding data for the induction coil and the transformer M are given. In a modification referred to in the Provisional Specification a coil connected across the receiver is wound on the usual induction coil.
GB2148325A 1925-08-27 1925-08-27 Improvements relating to telephone instrument circuits Expired GB263211A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR599659D FR599659A (en) 1925-08-27 1925-06-17 Apparatus for the manufacture of artificial silk
GB2148325A GB263211A (en) 1925-08-27 1925-08-27 Improvements relating to telephone instrument circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2148325A GB263211A (en) 1925-08-27 1925-08-27 Improvements relating to telephone instrument circuits

Publications (1)

Publication Number Publication Date
GB263211A true GB263211A (en) 1926-12-28

Family

ID=10163688

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2148325A Expired GB263211A (en) 1925-08-27 1925-08-27 Improvements relating to telephone instrument circuits

Country Status (2)

Country Link
FR (1) FR599659A (en)
GB (1) GB263211A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2544018A (en) * 1946-06-04 1951-03-06 Beaunit Mills Inc Spinning funnel

Also Published As

Publication number Publication date
FR599659A (en) 1926-01-18

Similar Documents

Publication Publication Date Title
GB414251A (en) Improvements in or relating to thermionic valve circuit arrangements
GB263211A (en) Improvements relating to telephone instrument circuits
US1983477A (en) Telephone system
GB425566A (en) Improvements in or relating to telephone instrument circuits
US1984062A (en) Telephone set
GB266666A (en) System for protecting weak current conductors from being influenced by heavy current conductors
US1474430A (en) Telephone bepeatee
GB388954A (en) Improvements in and relating to means for compensating for the inductance of a conductor
SU29874A1 (en) Device for using telephone lines of the central battery system for sending DC pulses to the telephone line
GB137367A (en) Improvements in or relating to telephone circuits
GB397910A (en) Improvements in or relating to alternating current supply systems for sound transmitting installations
GB363512A (en) Improvements relating to telephone instrument circuits
GB511955A (en) Improvements in or relating to telephone subset circuits
GB549623A (en) Coupling arrangement for power line carrier telephone systems
GB401782A (en) Improvements in means for preventing disturbances in wireless apparatus using rotaryconverters
GB249068A (en) Improved wired radio on power lines
GB340634A (en) Improvements in circuit arrangements for automatic telephone systems
GB457215A (en) Improvements in or relating to telephone circuits
GB382600A (en) Circuit arrangement for the recording and reproducing coils of telegraphones
GB191257A (en) Telephone systems
GB340693A (en) Improvements in or relating to telephone circuits
GB390271A (en) Improvements in artificial networks for a balancing line or cable impedance
GB431047A (en) Method and equipment for transmitting electrical test values
GB554367A (en) Inductance apparatus
GB259198A (en) Improvements in or relating to current transformers