GB653713A - Telephone communication systems - Google Patents

Telephone communication systems

Info

Publication number
GB653713A
GB653713A GB2371148A GB2371148A GB653713A GB 653713 A GB653713 A GB 653713A GB 2371148 A GB2371148 A GB 2371148A GB 2371148 A GB2371148 A GB 2371148A GB 653713 A GB653713 A GB 653713A
Authority
GB
United Kingdom
Prior art keywords
circuit
transmitter
receiver
amplifier
wire
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
GB2371148A
Inventor
Thomas Winton Johnson
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.)
ADMIRALITY ENGINEERING LABORATORY
Original Assignee
ADMIRALITY ENGINEERING LABORATORY
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 ADMIRALITY ENGINEERING LABORATORY filed Critical ADMIRALITY ENGINEERING LABORATORY
Priority to GB2371148A priority Critical patent/GB653713A/en
Publication of GB653713A publication Critical patent/GB653713A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/001—Two-way communication systems between a limited number of parties

Abstract

653,713. Intercommunication systems. JOHNSON, W. T., and MACLAREN, H. D. Sept. 9, 1948, No. 23711. [Class 40 (iv)] In a system in which telephone transmitters Tx are connected between one wire and a common wire and receivers Rx are connected between another wire and the common wire, the transmitter and receiver circuits being connected to the input and output circuits of an amplifier, the voltages in the two wires are arranged to be equal in magnitude but opposite in phase so that the interference in a neighbouring circuit due to the transmitter circuit cancels that due to the receiver circuit. As shown, the transmitter circuit is connected to the input of a phase reversing amplifier V1 which feeds an amplifier V2 with an output auto-transformer in its cathode circuit for matching to the receiver circuit. By arranging that the receiver impedance is low compared with the transmitter impedance, power amplification is produced while the voltages in the transmitter and receiver circuits remain equal.
GB2371148A 1948-09-09 1948-09-09 Telephone communication systems Expired GB653713A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2371148A GB653713A (en) 1948-09-09 1948-09-09 Telephone communication systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2371148A GB653713A (en) 1948-09-09 1948-09-09 Telephone communication systems

Publications (1)

Publication Number Publication Date
GB653713A true GB653713A (en) 1951-05-23

Family

ID=10200059

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2371148A Expired GB653713A (en) 1948-09-09 1948-09-09 Telephone communication systems

Country Status (1)

Country Link
GB (1) GB653713A (en)

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