US1656158A - Reducing intersystem cross talk between carrier channels - Google Patents

Reducing intersystem cross talk between carrier channels Download PDF

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Publication number
US1656158A
US1656158A US1656158DA US1656158A US 1656158 A US1656158 A US 1656158A US 1656158D A US1656158D A US 1656158DA US 1656158 A US1656158 A US 1656158A
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channels
circuit
adjacent
transmission
bands
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems
    • H04J1/02—Details
    • H04J1/12—Arrangements for reducing cross-talk between channels
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T24/00—Buckles, buttons, clasps, etc.
    • Y10T24/21—Strap tighteners
    • Y10T24/2102—Cam lever and loop
    • Y10T24/2119—Tie chain tighteners

Definitions

  • This invention relates to multiplex transmission and more particularly to the reduction of crosstalk between multiplex carrier systems superposed on adjacent transmission systems.
  • the channels in a given range on one transm .sion system being organized to transmit in the same direction as the corresponding channels in the same rangre in the ase of an adjacent transmission system. .Vith such an arrangement the cro stalk is 43 reduced because the transmission producim the YUI tElllI at each portion of the circu t i of the same order of magnitude as the signal t insmission in the adjacent circuit and therefor-e the induced crosstalk will be.
  • the present invention involves the dis-- covery that the channels of one system may he staggered with respect to those ot" another system. even when the channels are as closely spaced in each system as the selective devices employed will permit. without. any material tendency for a channel on one circuit to crosstalk into the channels immediately above and below it on the adjacent circuit.
  • FIG. 1 and 3 are charts illu: rating two forms of channel arrangements which may be employed in accordance with the present invention.
  • Figs. 2 and 4 are schematic representations to indicate how the channel spacing systems of Figs. 1 and 3 respectively may be applied in cases where more than two pairs of conductors on the same pole line a multiplexed.
  • the frequency alliicetion shown at A in Fig. l is emplo tl for all oi the etch pair'swhile the B allocation is employer/l for all the odclpairs.
  • the channelsot' a given pair are stag ererl with respect to the channels of the nearestatljacent pair oneacl side, while the channelsoi a given pfr will coi' crite with the channels olf the second pair at side thereoi.
  • Thee ce ntl pairs are net-e sariiy loc itecl at a gi1 ater distance than the immediately adjacent pairs so that the crvstall; in this case isgcuttl'o wtn in yolume by a special separationirather than' by fluency segari-ition.
  • the Q :illt between imme cli ately adjacent pair will be greatly rc clucecl by the staggering arrangeine' ts while the crosstalkbetween two systems of similar frequencyallocation wil be reduced by lack proximity, the two systems being se aratecl by an intermediate pair.
  • a sys tern employing three clegr ot' staggering may be designed as indicated in Fig. 3.
  • the carrier freajnency ot' the channels numbered 1, of systems B and (7 equally spaced between the carrier frequency of channels 1 and 2 of system A.
  • thelpealts of energy in the two channels of systems B and, C fall between the peaks of energy of the two adjacent channels in system A.
  • the reduction in crosstalk between any two otthe three frequencylalloczitions will not be as great as in the doubl e frequency allocationof'Fig, l. 7
  • the additionalpair combination which is made avail able by this system will, in its application t.
  • a transmission system in which a ph rality of transmission circuits are e; 1 along the same pole line, carrier channels superposed on each transmission circuit the frequency bands of the channels on a particular circuit being only se'paratectfrbm each other by a sufficient range to prevent; undue cr sstalk from one channelto an adjacent channel on the same circuit, ancltl c frequency bands of the channels of one circuit being so allocated. with respect to the bands of the channels of the adjacent circuit that the portion of the band Carrying the maximum energy will coincide witli'the separating range between the bands of the adjacent circuit. 1 v,
  • tra mission circuit being: separated by a frequency ran ie of Such width as to prevent undue croswata k betweena'nychannel and. an adjacent channel on the same circuit, saitl separating fr e; quency range being: oi less wiclt-h than the incliviclirelj frequency bands themselves. and the frequency bands of one transm. on circorresponding to the various channels of,
  • each circuit being separated from each other only by airequency range of wient with h toprevent undue croset k be 't n adjacent channels of the same ci cnit.
  • ancl the frequency bands of the channels on any given transmission circuit being so allocated w' l: respect to the bands of other cir the same" pole line that the parts of bands carrying the maximum energy upon the two nearest adjacent circuits on each side will fall within the range separating two of the bands of the first circuit, the bands of the two adjacent circuits being also so related that the portions thereof carrying the ma: :i mum energy will be offset with respect to each other.
  • a transmission system in which a plurality of transmission circuits are extended along the same pole line, carrier channeis superposed on each transmission circuit, the frequency bands of the channels on a particular circuit being only separated from each other by a sufficient range to preventundue crosstalk from one channel to an adjacent channel on the same circuit, and the frequency bands of the channels of one circuit being so allocated with respect to the bands of the channels of the adjacent circuit that the portion of the band carrying maximum energy will coincide with a part of the bands on the adjacent circuit which corresponds to a range in which the receiving element of the adjacent circuit is incfiicient,
  • a transmission system in which a plurality of transmission circuits are extended along the same pole line, a plurality of carrier channels superposed on each transmission circuit, the frequency bands of the "arious channels of each transmission circuit being separated by a frequency range of such width as to prevent undue crosstalk between any channel and an adjacent channel on the same circuit, said separating frequency range being of less width than the individual fre quency bands themselves, and the frequency bands of one transmission circuit being so allocated with respect to those of the nearest adjacent circuit that the portion of the band carrying maximum energy will coincide with a part of the bands on the adjacent circuit which corresponds to a range in which the receiving element of the adjacent circuit is inefiicient.
  • a transmission system comprising a plurality of transmission circuits, a plurality of signaling channels superposed upon each transmission circuit, the frequency bands corresponding to the various channels of each circuit being separated from each other only by a frequency range of sufiicient width to prevent undue crosstalk between adjacent channels of the same circuit, and the frequency bands of the channels on any given transmission circuit being so allocated with respect to the bands of other circuits upon the same pole line that the portions of the bands carrying maximum energy on the two nearest adjacent circuits on each side of given circuit wili coincide with the part of the bands on the intermediate circuit which corresponds to a range in which the receiving element is inefficient, the bands of the two adjacent circuits being also so related that the portions thereof carrying maximum energy will be offset with respect to each other.
  • a transmission system in which a plurality of transmission circuits are extended along the same pole line, carrier channels superposed on each transmission circuit, the frequency bands of the channels on a particular circuit being only separated from each other by a suiiicient range to prevent undue crosstalk from one channel to an adjacent channel on the same circuit, and the frequency bands of the channels of one circuit being so allocated with respect to the bands of the channels of the adjacent circuit that the portion of the band carrying maximum energy does not coincide with the portion of the band on an adjacent circuit which carries maximum energy.
  • a transmission system in which a plurality of transmission circuits are extended along the same pole line, a plurality of carrier channels superposed on each transmission circuit, the frequency bands of the various channels of each transmission circuit being separated by a frequency range of such width as to prevent undue crosstalk between any channel and an adjacent channel on the same circuit, said separating frequency range being of less width than the individual frequency bands themselves, and the frequency bands of one transmission circuit being so allocated with respect to those of the nearest adjacent circuit that the portion of the band carrying maximum energy does not coincide with the portion of the band on an adjacent circuit which carries maximum energy.
  • a transmission system in which a plurality of transmission circuits are so related as to produce cross induction, carrier chan nels superposed upon each transmission circuit, the frequency bands of the channels of a particular circuit being only separated from each other by a sufficient range to prevent undue crosstalk from one channel to an adjacent channel on the same circuit, and the frequency bands of the channels of one circuit being so allocated with respect to the bands of the channels of a circuit having the highest coefiicient of cross induction with respect to said circuit that the portion of the band carrying the maximum energy will coincide with the separating range between the bands of said other circuit.
  • a transmission system in which a plurality of transmission circuits are so related to each other that cross induction will result, a plurality of carrier channels superposed on each transmission. circuit, the frequency bands of the various channels of each circuit being separated by a frequency range of such width as to prevent undue crosstalk on an adjacent channel of the same circuit, said separating frequency range being of less width than the individual frequency bands themselves, and the frequency bands of one transmission circuit being so allocated with respect to those. of the circuit having the 5 highest coefiicient of cross induction with respect thereto that the portion of the band carrying the maximum amount of energy will coincide with a range separating two bands on said other circuit.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Noise Elimination (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Communication Cables (AREA)
US1656158D 1926-02-01 Reducing intersystem cross talk between carrier channels Expired - Lifetime US1656158A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2919/26A GB269996A (en) 1926-02-01 1926-02-01 Improvements relating to electric signalling systems employing carrier waves

Publications (1)

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US1656158A true US1656158A (en) 1928-01-17

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Family Applications (1)

Application Number Title Priority Date Filing Date
US1656158D Expired - Lifetime US1656158A (en) 1926-02-01 Reducing intersystem cross talk between carrier channels

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US (1) US1656158A (fr)
FR (1) FR616822A (fr)
GB (1) GB269996A (fr)

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Publication number Publication date
FR616822A (fr) 1927-02-09
GB269996A (en) 1927-05-02

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