US1944283A - Telephone interconnecting circuit - Google Patents

Telephone interconnecting circuit Download PDF

Info

Publication number
US1944283A
US1944283A US458441A US45844130A US1944283A US 1944283 A US1944283 A US 1944283A US 458441 A US458441 A US 458441A US 45844130 A US45844130 A US 45844130A US 1944283 A US1944283 A US 1944283A
Authority
US
United States
Prior art keywords
line
polygon
transmitting
lines
receiving
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
US458441A
Other languages
English (en)
Inventor
Strecker Felix
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.)
Siemens and Halske AG
Siemens AG
Original Assignee
Siemens 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 Siemens AG filed Critical Siemens AG
Application granted granted Critical
Publication of US1944283A publication Critical patent/US1944283A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/56—Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities

Definitions

  • the present invention relates to interconnecting circuits for telephone lines or similar circuits.
  • the invention has particular reference to the socalled conference type of connection in which 5 three or more subscribers lines are interconnected so that each may communicate simultaneously with all the others.
  • An object of the invention is to associate three or more telephone or similar circuits by a simple and direct scheme of interconnection providing conjugacy between the transmitting and receiving terminals of each line.
  • a feature of the invention is the use of an interconnecting network in the form of a polygon in which the sides of the polygon are used for transmitting and the diagonals for receiving.
  • the polygon preferably has as many sides as there are circuits or lines to be interconnected.
  • the impedances of the respective sides of the network of polygon form are preferably equal and the impedances of the diagonals are also equal, thus providing mutually equal attenuation for all the subscribers.
  • Fig. 1 discloses a diagram showing the fundamental principle of interconnection according to the invention.
  • Fig. 2 discloses one type of circuit for putting the principle of the invention into operation.
  • Fig. 1 shows a polygon of five sides although this polygon may be considered as having N sides where N is any odd number greater than four.
  • the sides of the polygon hl to hs are intended in this figure to represent equal impedances which are connected in series to form a complete polygon of impedances.
  • the apices 1 to 5 areall connected with each other by diagonals n to m respectively.
  • the diagonal 11 therefore, connects points of equal potential (3 and 5) and is conjugate with respect to the source of E. M. F. in the side hi.
  • the receiving branches T2 to T5 of the other lines will each receive an E. M. F. from the transmitting branch h1 of the first line.
  • each line directly transmits to all of the other lines but there is no feed-back or return voltage appearing at the receiving side of any given line.
  • each of the five two-way lines Z1 to Z5 is provided with a corresponding balancing network in to 725 and hybrid coil m to as. 7
  • the transmitting branch of each line is connected into one of the sides of the polygon, that is, in the position hl, 7L2, etc. If desired, each such transmitting branch contains an amplifier '0.
  • Each receiving branch leading to the hybrid coil (11, :12, etc., is connected in a diagonal r1, 12, etc., which may likewise, if desired, contain an amplifier 0.
  • the receiving branch of each line is connected to the proper diagonal of the network to make the receiving branch conjugate with respect to the transmitting branch of that line.
  • the five sided polygon may also be used Where only four subscribers lines are to be interconnected. This may be done by replacing certain of the two-wire lines of Fig. 1 or 2 by suitable resistances or impedances which simulate an actual line.
  • line Z4 may be removed from the network by shifting the four switches s1, s2, s3 and st to their alternate contacts so that an impedance 21 is substituted in diagonal 1'4 for the transmitting impedance offered by line Z4 when present ande'z is substituted in the side hi for the receiving impedance of the line.
  • other lines may be disconnected and replaced by equivalent impedances.
  • the principle of the invention illustrated and described in connection with Figs. 1 and 2 may, as already stated, be extended to a greater number of subscribers lines than five. In this latter case also, diagonals or sides which it is not desired to use for the transmitting or receiving branches of a line may be replaced by suitably proportioned resistances.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
US458441A 1929-06-22 1930-05-31 Telephone interconnecting circuit Expired - Lifetime US1944283A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1944283X 1929-06-22

Publications (1)

Publication Number Publication Date
US1944283A true US1944283A (en) 1934-01-23

Family

ID=7750643

Family Applications (1)

Application Number Title Priority Date Filing Date
US458441A Expired - Lifetime US1944283A (en) 1929-06-22 1930-05-31 Telephone interconnecting circuit

Country Status (3)

Country Link
US (1) US1944283A (xx)
BE (1) BE363032A (xx)
FR (1) FR680306A (xx)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3135829A (en) * 1959-10-09 1964-06-02 Itt Conference call circuit
DE977019C (de) * 1942-12-31 1964-12-23 Western Electric Co Kopplungsanordnung fuer Wellenuebertragungssysteme
US3885100A (en) * 1974-05-31 1975-05-20 Bell Telephone Labor Inc Six-port conference amplifier circuit
US3891801A (en) * 1974-01-21 1975-06-24 Quindar Electronics Four-way four-wire active bridge
US4008376A (en) * 1975-10-17 1977-02-15 Bell Telephone Laboratories, Incorporated Loudspeaking teleconferencing circuit
US4289932A (en) * 1979-10-15 1981-09-15 Reed Roger R Conferencing communications system
US12048394B2 (en) 2020-09-16 2024-07-30 Haig Levon Gulian Grill

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE977019C (de) * 1942-12-31 1964-12-23 Western Electric Co Kopplungsanordnung fuer Wellenuebertragungssysteme
US3135829A (en) * 1959-10-09 1964-06-02 Itt Conference call circuit
US3891801A (en) * 1974-01-21 1975-06-24 Quindar Electronics Four-way four-wire active bridge
US3885100A (en) * 1974-05-31 1975-05-20 Bell Telephone Labor Inc Six-port conference amplifier circuit
DE2523620A1 (de) * 1974-05-31 1975-12-11 Western Electric Co Konferenzschaltung
US4008376A (en) * 1975-10-17 1977-02-15 Bell Telephone Laboratories, Incorporated Loudspeaking teleconferencing circuit
US4289932A (en) * 1979-10-15 1981-09-15 Reed Roger R Conferencing communications system
US12048394B2 (en) 2020-09-16 2024-07-30 Haig Levon Gulian Grill

Also Published As

Publication number Publication date
FR680306A (xx) 1930-04-26
BE363032A (xx)

Similar Documents

Publication Publication Date Title
US1944283A (en) Telephone interconnecting circuit
US3761624A (en) Time division signal transfer network
US3855431A (en) Electronic hybrid amplifier
GB1562937A (en) Conference circuits
US3689710A (en) Two-wire to four-wire conversion circuit for a data switching center
US3083265A (en) Conference call circuit
US2270644A (en) Negative impedance circuits
US3068329A (en) Negative-impedance repeater
US2019603A (en) Interconnection of transmission lines
US2755445A (en) Interconnection of transmission lines
US1643332A (en) Electrical network
US1243066A (en) Network for neutralizing the characteristic reactance of a loaded line.
US1969836A (en) Negative impedance
US3912877A (en) Electrical communication switching network providing far-end crosstalk reduction
Merrill Jr et al. Negative impedance telephone repeaters
US1799188A (en) Cross-talk reduction
US3803369A (en) Active coupler for nodes of bidirectional two-wire transmission lines
US3229040A (en) Telephone exchange systems
US3201719A (en) Simulation network
US1624936A (en) Telegraph system
US1664755A (en) Electrical network
US4286114A (en) Two-wire resistance bridges for private line circuits
US287288A (en) The kohr
US1288709A (en) Duplex balancing-circuits.
US1515643A (en) Transmission circuits