US1702309A - Composite set - Google Patents

Composite set Download PDF

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Publication number
US1702309A
US1702309A US1702309DA US1702309A US 1702309 A US1702309 A US 1702309A US 1702309D A US1702309D A US 1702309DA US 1702309 A US1702309 A US 1702309A
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Prior art keywords
telegraph
telephone
circuit
impedance
line
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    • 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
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/54—Circuits using the same frequency for two directions of communication
    • H04B1/58—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa

Definitions

  • composite set whereby the incoming telegraph and telephone currents may be separated and diverted to their respective circuits without interference with each other.
  • the composite set furthermore, functions to prevent the outgoing telegraph currents from entering the telephone path at the terminal facilities and vice versa.
  • composite sets have separated the telephone and telegraph channels by means of frequency selectivity.
  • the improved composite set of this invention not only makes use of frequency discrimination or selectivity to separate the incoming telephone and telegraph channels, but embodies certain novel features and principles with respect to the prevention of interference between the different types of currents originating in the different telephone and telegraph branches at the terminal facilities.
  • the impedance of both the telegraph and telephone terminal apparatus substantially equal to a common pure resistance
  • the impedance of the two, as seen through the composite set, to the line also is substantially equal to a pure resistance at all frequencies
  • the impedance of the line to the telephone and telegraph, as seen through the composite set may be made pure resistance, line impedance, or other desired impedance. This will tend to improve the transmission characteristics of the systems by obviating echoes, reflections, and reflection losses. Further features or objects of the invention will appear more fully from the detailed description hereinafter given.
  • Figs. 1, 2, 4 and 5 illustrate schematically, certain principles involved in the invention.
  • Figs. 3 and 6 the invention is shown inschematic form.
  • Fig. 7 shows a practical embodiment of the invention, and Fig. 8 a modification thereof.
  • Fig. l One of the principles utilized in the com posite set of this invention is illustrated in Fig. l, in which the telegraph and telephone branches are shown tentatively as connected to the opposite sides of a Wheatstone bridge composed of the equal resistances 7",, 1' 7' and 1",.
  • current bommg in over the telegraph branch will not be transmitted out over the telephone branch as the points P and P are of equal potential.
  • current from the telephone branch will not be transmitted out over the telegraph branch as the latter would be connected to the equi-potential points P and P
  • the line circuit is shown schematically as as sociated with one of the arms of the bridge.
  • a capacity C is substituted for the resistance arm 1, of Fig. 1 and the resistance arm 1*, is changed into an inductance L.
  • the capacity C the low frequency currents coming in from the telegraph branch will not take the path C73, but will take the path 03L.
  • the high frequency currents from the telephone branch, due to the inductance L, will not take the path In", but will follow the path 13C.
  • the composite set of the invention is shown in schematic form in the arrangements 0t Fig. 3.
  • the arrangement and proportionment of the elements of Fig. 3 will be more apparent from a discussion of Figs. l and 5.
  • 3 is not equally divided between the telephone and telegraph branches but that the ratio of division is a tuinctimi. of frequency. At a frequency determined by the relation tween the line and network or in other words, conjugacy between the telephone and telegraph branches.
  • Fig. 6 is shown an arrangement which applies one balancing network llN to each of the two line wires. This gives two sets of places for the telephone and telegraph to be connected. The telegraph case can be reduced to a single one immediately by making the connection indicated in the dotted line. The two telephone branches can be combined in a similar manner by the use of a transformer. The corresponding arrangement is shown in F 1 which is arranged in a more usual manner and includes connections for a phantom circuit.
  • the arran 'emcnt shown in Fig. 7 is not as good or desiralrate in re pect to toe matter of deriving the phantom circuit, shown as the connection Ph. because the phantom telenot derive the benefit of balance disc initiation.
  • the arrangeshown in Fig. i5 is more at actory in phone circuit (i( the not in that the plat-atom circuit is put on ruc lmsie-r :rhe de circuits.
  • the apparatus above the dotted line is made up of three transformers which have been designated I, II and III. I and II are the side circuit transformers and III is the phantom circuit transformer.
  • I and II are the side circuit transformers and III is the phantom circuit transformer.
  • the poling of the various windings is indicated by the numerals which are so arranged that current flowing from an odd to an even terminal produces magnetism of a given sign.
  • the cross-fire among the various telegraph circuits seems to be taken care of, particularly if the neutral point is grounded, as indicated by the dotted connection in Fig. 8.
  • a V'Jheatstone bridge substantially balanced for all frequencies having one set of opposite arms comprising a line circuit and a balancing network and another set of opposite arms comprising an inductance and a capacity, respectively, a telegraph circuit connected to the junction point of said line circuit and said capacity and to the junction point of said inductance and said balancing network, and a telephone circuit connected to the junction point of said line circuit and said inductance and the junction point of said balancing network and said capacity.
  • a /Vheatstone bridge substantially balanced at all frequencies having one set of opposite arms comprising a line circuit and a balancing network and another set of opposite arms comprising an inductance and a capa ,ity, and signaling circuits of different types connected to the opposite junction points of the arms of said bridge.
  • a transmission line and a composite set associated therewith comprising a telephone circuit and a telegraph circuit so arranged as to be in conjugate relatio-nshlp to each other and having the constants of said circuits so adjusted that the impedances presented to said circuits will each be substantially equal to a common pure resistance.
  • a balanced VVheatstone bridge having one set of opposite arms comprising a line circuit and a balancing network and another set of opposite arms comprising an inductance and a capacity, a telegraph circuit connected to the junction point of said line circuit and said capacity and to the unction point of said inductance and said balancing network, and a telephone circuit connected to thejunction point of said line circuit and said inductance and the junction point of said balancing net work and said capacity, the constants of said telephone and telegraph circuits being so adjusted that the impedances of said circuits will each be substantially equal to a common pure resistance.
  • A. balanced Nheatstone bridge having one set of opposite arms comprising a line circuit and a balancing network and another set of opposite arms, one of which comprises an impedance much larger for telephone than for telegraph currents, and the other of which comprises an impedance much larger for telegraph than for telephone currents, a telegraph circuit connected to the junction point of said line circuit and the last mentioned one of said second set of opposite arms, and to the junction point of said network and the first mentioned one of said second set of opposite arms, and a telephone circuit connected to the junction point of said line circuit and the first mentioned one of said second set of opposite arms and to the junction point of said network and the second mentioned one of said second set of opposite arms.
  • a balanced Wheatstone bridge having one set of opposite arms comprising a line circuit and a balancing network and another set of opposite arms one of which comprises an impedance much larger for telephone than for telegraph currents and the other of which comprises an impedance much larger for telegraph than for telephone currents, a telegraph circuit connected to the junction point of said line circuit and the last mentioned one of said second set oi opposite arms and to the junction point of said network and the first mentioned one of said second set of opposite arms, and a telephone circuit connected to the junction, point of said line circuit and the first mentioned one of said second set of opposite arms and to the junction point of said network and the second mentioned one of said second set of opposite arms, the constants ofthe arms of said bridge being so adjusted that as seen from either said telephone circuit or said telegraph circuit the impedance of the bridgewill be substantially a pure resistance within a working frequency range.
  • a balanced VVheatstone bridge having one set of opposite arms comprising a line circuit and a balancing network and another set of opposite arms one of which comprises an impedance much larger for telephone than for telegraph currents and the other of which comprises an impedance much larger for telegraph than for telephone currents, a telegraph circuit connected to the junction point of said line circuit and the last mentioned one of said second set of opposite arms and to the junction point of said network and the first mentioned one of said second set of opposite arms, and a telephone circuit connected to the junction, point of said line circuit and the first mentioned one of said second set of op posite arms and to the junction point of said network and the second mentioned one of said second set of opposite arms, the constants of the arms of said bridge being so adjusted that as seen from either of said telephone circuit or said telegraph circuit the impedance of the bridge will be substantially equal to the line impedance within the Work ing frequency range.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
US1702309D 1927-10-19 Composite set Expired - Lifetime US1702309A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH137893T 1927-10-19

Publications (1)

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US1702309A true US1702309A (en) 1929-02-19

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CH (1) CH137893A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1103395B (de) * 1959-06-10 1961-03-30 Carl Lindstroem Ges M B H Schaltungsanordnung fuer die rueckwirkungsfreie Abzweigung von elektrischen Stroemen, vorzugsweise von Tonfrequenzstroemen aus Anpassungsnetzwerken von Tonaufnahmeeinrichtungen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1103395B (de) * 1959-06-10 1961-03-30 Carl Lindstroem Ges M B H Schaltungsanordnung fuer die rueckwirkungsfreie Abzweigung von elektrischen Stroemen, vorzugsweise von Tonfrequenzstroemen aus Anpassungsnetzwerken von Tonaufnahmeeinrichtungen

Also Published As

Publication number Publication date
CH137893A (de) 1930-01-31

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