US2124318A - Broadcast system - Google Patents

Broadcast system Download PDF

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Publication number
US2124318A
US2124318A US71831A US7183136A US2124318A US 2124318 A US2124318 A US 2124318A US 71831 A US71831 A US 71831A US 7183136 A US7183136 A US 7183136A US 2124318 A US2124318 A US 2124318A
Authority
US
United States
Prior art keywords
lines
groups
transmitters
high frequency
broadcast system
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 - Lifetime
Application number
US71831A
Other languages
English (en)
Inventor
Seidelbach Rudolf
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.)
Alcatel Lucent Deutschland AG
C Lorenz AG
Original Assignee
Standard Elektrik Lorenz AG
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 Elektrik Lorenz AG filed Critical Standard Elektrik Lorenz AG
Application granted granted Critical
Publication of US2124318A publication Critical patent/US2124318A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/65—Arrangements characterised by transmission systems for broadcast
    • H04H20/76—Wired systems
    • H04H20/77—Wired systems using carrier waves
    • H04H20/81—Wired systems using carrier waves combined with telephone network over which the broadcast is continuously available

Definitions

  • I8 filters would be to combine the lines to form groups are denoted. and then to make vthese groups equal to each
  • the advantage of the novel circuit arrangeother by arranging artificial means of attentua' ment is that no energy losses occur and that the 35 tion.
  • AThis lmode however would entail that regulation of the surge impedance of the several very much energy would be destroyed.
  • groups of lines has no influence on the surge will be seen from the numerical example before impedance of other groups. stated, most of the subscriber stations are com- For the sake of clearness the arrangement 4,0 paratively near to the telephone exchange.
  • the represented nearly contains thevhigh frequency attenuation of all these lines would have to be portion, that is, does not contain the low freaugmented to be of the same value as the attenquency exchange portion and the like.
  • the high uation of the longest subscriber line connected frequency exchange arrangement, and the 10W t0 the exchange, a mOde Which 0f COUTS@ would frequent one are separated from each other by 1'1V01Ve a great 1055 0f energyfilters in a manner well known in itself.
  • the 45 In Order t0 avoid these dSadVantageS the in* respective details need not be described here vention proposes to combine the subscriber lines Since they are known per se,
  • an individual amplifying device connected in one 55 or more of said separate paths whereby a desired intensity of signal is produced at the far end of every line, and impedance matching means between said transmitters and said lines.
  • a plurality of high frequency transmitters a plurality of subscribers lines of dierent characteristics associated in groups, within each of which, the lines are of substantially similar characteristics, an individual coupling path from said plurality of transmitters to one of said groups of lines, further individual coupling paths fromv said plurality of transmitters to each other group of lines, impedance matching means in each of said paths and an individual amplifier connected in each one of said further paths and adapted to amplify the power in said one of said paths to such a level relative to the power in the other paths, that the resulting power transmitted to the ends of all lines is substantially the same.
  • AV system according to claim 1 further comprising potentiometers disposed between said individual amplifying devices and said transmitters.
  • a system according to claim 1 further comprising filters adapted to prevent high frequency energy from passing from one transmitter to another.

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Networks Using Active Elements (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
US71831A 1935-04-06 1936-03-31 Broadcast system Expired - Lifetime US2124318A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE453566X 1935-04-06

Publications (1)

Publication Number Publication Date
US2124318A true US2124318A (en) 1938-07-19

Family

ID=6538795

Family Applications (1)

Application Number Title Priority Date Filing Date
US71831A Expired - Lifetime US2124318A (en) 1935-04-06 1936-03-31 Broadcast system

Country Status (4)

Country Link
US (1) US2124318A (enrdf_load_stackoverflow)
BE (1) BE414738A (enrdf_load_stackoverflow)
FR (1) FR803768A (enrdf_load_stackoverflow)
GB (1) GB453566A (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
BE414738A (enrdf_load_stackoverflow)
FR803768A (fr) 1936-10-08
GB453566A (en) 1936-09-14

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