GB742717A - A long-distance telephone system with voice-frequency signalling - Google Patents

A long-distance telephone system with voice-frequency signalling

Info

Publication number
GB742717A
GB742717A GB70753A GB70753A GB742717A GB 742717 A GB742717 A GB 742717A GB 70753 A GB70753 A GB 70753A GB 70753 A GB70753 A GB 70753A GB 742717 A GB742717 A GB 742717A
Authority
GB
United Kingdom
Prior art keywords
signal
relay
signals
relays
filters
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
GB70753A
Inventor
Svatopluk Rak
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.)
Tesla AS
Original Assignee
Tesla AS
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 Tesla AS filed Critical Tesla AS
Priority to GB70753A priority Critical patent/GB742717A/en
Publication of GB742717A publication Critical patent/GB742717A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/46—Monitoring; Testing

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

742,717. Voice frequency signalling. TESLA, NARODNI PODNIK. Jan. 9, 1953, No. 707/53. Class 40 (4). A telephone system employing v.f. signals, preferably in the upper part of the speech band, comprises signal-attenuating filters in the line which are disabled for the duration of the speech period by a backward signal from the called party, but are temporarily reinserted whenever the signal frequencies are imitated in speech. As shown, a tuned signal receiver E located between adjoining sections of a four-wire line responds to v.f. signals in the W-E direction, and on receipt of a preparatory signal of predetermined duration causes relays P and I to operate in turn. Relay D then locks up and operates a slow-release relay V. When the preparatory signal terminates, relays P1 and I fall back and pull up a slow-release relay G. The operated relays D and G together permit relay I to repeat subsequently received v.f. signals as D.C. pulses in the outgoing W-E section, direct transfer of these signals being prevented by a filter F1. When the called party answers, a backward impulse pulls up relay L which repeats the signal in the outgoing E-W section as a corresponding v.f. impulse from S1 over contacts l1, l2. Slow-release relay K also pulls up for the duration of the pulse and falls back after L so that H locks up. The filters F1 and F2 are then disconnected by operation of relay R. The reception of signal frequencies during the speech period causes relays P and I to operate so that R falls back and reinserts the filters for the duration of the signals. When the calling party clears, a prolonged forward v.f. signal. likewise reconnects the filters. Reconnection is also effected when the called party clears by the operation of release relay Z from battery on the incoming E-W wires. When a call is set up in the reverse direction, a tuned signal receiver E<1> operates relays P<1>1 and Q corresponding to P1 and I respectively.
GB70753A 1953-01-09 1953-01-09 A long-distance telephone system with voice-frequency signalling Expired GB742717A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB70753A GB742717A (en) 1953-01-09 1953-01-09 A long-distance telephone system with voice-frequency signalling

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB70753A GB742717A (en) 1953-01-09 1953-01-09 A long-distance telephone system with voice-frequency signalling

Publications (1)

Publication Number Publication Date
GB742717A true GB742717A (en) 1956-01-04

Family

ID=9709141

Family Applications (1)

Application Number Title Priority Date Filing Date
GB70753A Expired GB742717A (en) 1953-01-09 1953-01-09 A long-distance telephone system with voice-frequency signalling

Country Status (1)

Country Link
GB (1) GB742717A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10998730B1 (en) 2019-04-26 2021-05-04 NeoVolta, Inc. Adaptive solar power battery storage system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10998730B1 (en) 2019-04-26 2021-05-04 NeoVolta, Inc. Adaptive solar power battery storage system
US11605952B1 (en) 2019-04-26 2023-03-14 NeoVolta, Inc. Adaptive solar power battery storage system

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