GB531104A - Electric signal transmission systems - Google Patents

Electric signal transmission systems

Info

Publication number
GB531104A
GB531104A GB20208/39A GB2020839A GB531104A GB 531104 A GB531104 A GB 531104A GB 20208/39 A GB20208/39 A GB 20208/39A GB 2020839 A GB2020839 A GB 2020839A GB 531104 A GB531104 A GB 531104A
Authority
GB
United Kingdom
Prior art keywords
sign
signals
neutralizing
mis
artificial
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
GB20208/39A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB531104A publication Critical patent/GB531104A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
    • H04B3/23—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other using a replica of transmitted signal in the time domain, e.g. echo cancellers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/30—Time-delay networks
    • H03H7/32—Time-delay networks with lumped inductance and capacitance
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/12—Neutralising, balancing, or compensation arrangements

Abstract

531,104. Television ; preventing interference. STANDARD TELEPHONES & CABLES, Ltd. July 11, 1939, No. 20208. Convention date, July 13, 1938. Addition to 523,434. [Classes 40 (iii) and 40 (v)] [Also in Group XXXIX] The neutralizing signals which are used to balance out echoes due to reflections in the transmission medium as described in the parent Specification are derived from an artificial line 13 having a mis-matched termination 14, and, where a trail of artificial echoes is required, a mis-matched input impedance 12 also, the reflections being fed back into the line 1. The amplitude of the neutralizing signals depends on the extent of the mis-match, and the sign of the signals, relative to the main signal, on whether the termination and input impedance are greater or less than the artificial line impedance. The attenuation-frequency characteristic of the artificial line may be corrected or the characteristic of the neutralizing signals adjusted, by the terminal impedance. The impedances may be adjusted to produce a trail of neutralizing signals all of the same sign as or opposite in sign to the main signals, or alternating in sign and commencing with a signal of the same sign as or opposite sign to the main signal.
GB20208/39A 1938-07-13 1939-07-11 Electric signal transmission systems Expired GB531104A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR531104X 1938-07-13

Publications (1)

Publication Number Publication Date
GB531104A true GB531104A (en) 1940-12-30

Family

ID=8923721

Family Applications (1)

Application Number Title Priority Date Filing Date
GB20208/39A Expired GB531104A (en) 1938-07-13 1939-07-11 Electric signal transmission systems

Country Status (2)

Country Link
FR (1) FR50047E (en)
GB (1) GB531104A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2597781A (en) * 1947-05-02 1952-05-20 Gen Electric Co Ltd Electrical networks for echo correction in electrical signaling systems
US2552160A (en) * 1947-11-14 1951-05-08 Gen Electric Co Ltd Electrical network for the suppression of echoes and the like in electrical signalingsystems

Also Published As

Publication number Publication date
FR50047E (en) 1939-11-10

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