US2380232A - Telephone or like system - Google Patents

Telephone or like system Download PDF

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Publication number
US2380232A
US2380232A US514810A US51481043A US2380232A US 2380232 A US2380232 A US 2380232A US 514810 A US514810 A US 514810A US 51481043 A US51481043 A US 51481043A US 2380232 A US2380232 A US 2380232A
Authority
US
United States
Prior art keywords
line
voice frequency
signals
receiver
frequency 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 - Lifetime
Application number
US514810A
Other languages
English (en)
Inventor
Gillings Charles
Cowley Percy Edward Alexander
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.)
Automatic Electric Laboratories Inc
Original Assignee
Automatic Electric Laboratories Inc
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 Automatic Electric Laboratories Inc filed Critical Automatic Electric Laboratories Inc
Application granted granted Critical
Publication of US2380232A publication Critical patent/US2380232A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems
    • H04J1/02—Details
    • H04J1/16—Monitoring arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
    • H04Q1/446—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency
    • H04Q1/4465—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency the same frequency being used for all signalling information, e.g. A.C. nr.9 system

Definitions

  • An obvious method of overcoming this difficulty is to provide a separate voice frequency receiver on each side of what may be termed the splitting point so that a suitable response will be obtained to signals transmitted in either direction.
  • Such an arrangement involves additional cost and complication however, and it is the chief object of the invention to enable a single receiver to operate satisfactorily with signals from either direction while the desired blocking effect is still obtained so as to prevent the signals extending into portions of the line where their presence is not desired.
  • a single voice frequency receiver responsive to signals in either direction is rendered possible by connecting it to the line on both sides of the point where the blocking effect is produced by equipment giving unidirectional transmission.
  • the desired result is brought about by connecting the voice frequency receiver to the line on both sides of the splitting point by way of a hybrid coil while in another form the voice frequency receiver'is inductively coupled'to the line on both sides ofthe splitting point but by a thermionic valve circuit arrangement such that noappreciable transfer of Signal energy takes place across the splitting point.
  • Figs. 1 and 2 respectively of the accompanying drawing and both arrangements illustrate a voice frequency receiver connected up at a splitting point operating on the principle disclosed in the application of Gillings et al., filed September 18, 1943, Serial No. 502,884, whereby a virtual short-circuit is placed across the line to produce the blocking effect.
  • a transmission line, a resistance network, and contacts of a relay which it is intended shall be controlled by signals transmitted over the line are shown.
  • the relay contacts are arranged to connect the resistance network in the transmission line so as to at times effectively split it into two sections.
  • Two methods are shown for transmitting signals received over either line section to a single voice frequency receiver without interfering with the other line section.
  • a hybrid transformer is provided having its line coils connected between the two sections of the line on opposite sides of the resistance network and having its secondary coils connected to the input of the voice frequency receiver.
  • two transformers are employed having their primary windings connected respectively to the two line sections and having their secondary windings serially connected to the input of the voice frequency receiver.
  • l0 and I I represent the incoming speaking leads, and I2 and 13 the outgoing speaking leads. Signals from both directions may be transmitted to the voice frequency receiver VFR over leads l4 and I5 by way of the hybrid transformer HT.
  • the line coils of this transformer are connected by way of the resistances YE and YF which are designed.
  • resistance YE is cut out and a. straightsthroughconnection is provided.
  • the voice frequency receiver VFR is connected to theline on I each side of the splitting point by Way of a high impedance voltage circuit which includes two transformers TI and T2 the secondaries of which are in series in the grid-cathode path of the limiter valve LV of the receiver VFR.
  • a high impedance voltage circuit which includes two transformers TI and T2 the secondaries of which are in series in the grid-cathode path of the limiter valve LV of the receiver VFR.
  • a bi-directional transmission line means inserted in said line for at times preventing the transmission of signals therethrou'gh, a signal receiving circuit, and means coupling said signal receiving circuit to :said line at points on either side of said first means, whereby said signal receiving circuit is rendered responsive to signals received over the line from eitherdirection.
  • said coupling means comprises a hybrid transformer having its line windings connected to the transmission line at said points and having its secondary windings connected to said signal CHARLES GILLINGS. PERCY EDWARD ALEXANDER COWLEY.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)
US514810A 1943-01-14 1943-12-18 Telephone or like system Expired - Lifetime US2380232A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB696/43A GB562870A (en) 1943-01-14 1943-01-14 Improvements in telephone or like systems

Publications (1)

Publication Number Publication Date
US2380232A true US2380232A (en) 1945-07-10

Family

ID=9708927

Family Applications (1)

Application Number Title Priority Date Filing Date
US514810A Expired - Lifetime US2380232A (en) 1943-01-14 1943-12-18 Telephone or like system

Country Status (4)

Country Link
US (1) US2380232A (cs)
BE (1) BE466622A (cs)
FR (1) FR930147A (cs)
GB (1) GB562870A (cs)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2440281A (en) * 1943-04-22 1948-04-27 Telecommunications Sa Device for the transmission of calling and clearing signals in long distance telephonic circuits
US2468555A (en) * 1943-03-08 1949-04-26 Comp Generale Electricite Multiple modulation carrier frequency telephone system
US2972019A (en) * 1956-10-04 1961-02-14 Gen Dynamics Corp Automatic telephony ringing circuit
US3036163A (en) * 1959-05-15 1962-05-22 Bell Telephone Labor Inc Signaling system
EP0104907A2 (en) * 1982-09-24 1984-04-04 Energy Conversion Devices, Inc. Method of making amorphous semiconductor alloys and devices using microwave energy

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2566700A (en) * 1946-10-30 1951-09-04 Rca Corp Stereoscopic and stereosonic television system
BE521897A (cs) * 1952-08-03

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2468555A (en) * 1943-03-08 1949-04-26 Comp Generale Electricite Multiple modulation carrier frequency telephone system
US2440281A (en) * 1943-04-22 1948-04-27 Telecommunications Sa Device for the transmission of calling and clearing signals in long distance telephonic circuits
US2972019A (en) * 1956-10-04 1961-02-14 Gen Dynamics Corp Automatic telephony ringing circuit
US3036163A (en) * 1959-05-15 1962-05-22 Bell Telephone Labor Inc Signaling system
EP0104907A2 (en) * 1982-09-24 1984-04-04 Energy Conversion Devices, Inc. Method of making amorphous semiconductor alloys and devices using microwave energy
EP0104907A3 (en) * 1982-09-24 1984-07-25 Energy Conversion Devices, Inc. Method of making amorphous semiconductor alloys and devices using microwave energy

Also Published As

Publication number Publication date
GB562870A (en) 1944-07-19
FR930147A (fr) 1948-01-16
BE466622A (cs)

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