US2328944A - Transmission system employing pulse modulation - Google Patents

Transmission system employing pulse modulation Download PDF

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Publication number
US2328944A
US2328944A US333945A US33394540A US2328944A US 2328944 A US2328944 A US 2328944A US 333945 A US333945 A US 333945A US 33394540 A US33394540 A US 33394540A US 2328944 A US2328944 A US 2328944A
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United States
Prior art keywords
pulses
pulse
transmission system
transmitters
synchronizing
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Expired - Lifetime
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US333945A
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English (en)
Inventor
Beatty William Arnold
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International Standard Electric Corp
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International Standard Electric Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K1/00—General methods for the preparation of peptides, i.e. processes for the organic chemical preparation of peptides or proteins of any length
    • C07K1/006—General methods for the preparation of peptides, i.e. processes for the organic chemical preparation of peptides or proteins of any length of peptides containing derivatised side chain amino acids
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K7/00—Modulating pulses with a continuously-variable modulating signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B14/00—Transmission systems not characterised by the medium used for transmission
    • H04B14/02—Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation

Definitions

  • This invention relates to radio .transmission A systems utilising pulse .modulation inavplurality of channels, and residesin a systemwhereinjthe .fixed edges of the basic .time-modulatedpulses for; .the dierent channels are synchronised.
  • the invention is applicablegto twofwayoommunication ,systems and to systemsemploying. a
  • ⁇ nunfiloer of transmitter-receivers as.; wellas to transmitters single or multiple operating simultaneously on different wavelengths.
  • a HTTPS/RTA pulses nu befcnsidered A.as also 'ihiudirfig RL-- S/RL pulses, as both types are similarin essential 'characteristics l v In an RT
  • the presentinvention deals especially -vvith methods ofV utilising one timing pulse train for more than one transmission system having ,S/RT pulses. time modulated in accordance Withfintelligence The.
  • timing pulse trainJnay beg system the RTportion ⁇ -of thepulse, irradditionv to supplying intellior may bel time modulated and combined With an S/RT pulse giving an RT-l-S/RT; pulse, or thetirning pulse may be unn'ioduiatedl as regards time.
  • Fig. 1 shows ⁇ a rectangular pulseutilised, for l synchronising transmitters and receivers
  • Fig'. 2A is a .partial diagrammatic vie ⁇ v illus trating a modified arrangement table used in connection with thev target plate; arrangement Electric Corporal'igQ Y3 l shovvs in pulse transmitters.
  • pulse generator The beams f in the. various pulse generators are independently-deflected in directions at right anglesjtoj. the y 'deflection due to thesaW-tooth Wave-fo-rrn by' signals ⁇ corresponding t0 three independntkinds of intelligence, for instance, threejtelephone messages, thereby generating three'independei 1t groups of S/RT pulses'which are ,cl1a1'acte1istic of-rthree different kinds of intelligence.
  • the sawtooth Waverform used for deflectingthe beanrfacross the target 23 can also bejused ⁇ to-deflectinde;- pendent velectron beams across .each ⁇ of the ⁇ tar-k gets24 and 25, or alternatively' the pulses2i can short wave transmitter working for insta-nce onf This latter transmission h fow b f 1.9 metres.
  • geese/i4 Y necessarily constant carrier frequency, the pulse trains being unintelligible without information as to their manner of use.
  • the S/RT pulse modu- Y lation can be utilised to giveiritfelligern;'e'similar. ⁇ a i* u i synchronisation may in some cases be eli'ected di- .to that causing the generation of the S/RT pulses at the remote location.
  • Way communication 'it is not necessary for the I pulse radiated by "the, transmitter yZG'ft-o be of shortduration, theonlyiessentials being that -the pulses have the sam-e ffrequency Vof-oc'cufrreno'e 'as the pulses 2l and have'one edge ioccurring'at equal time intervals.
  • the pulses 'radiated from the transmitter4 26 can-be time modulated-in accordanoe with 'intelligence 'and Camif-or instance, be RT or RL -pulses as described in the *above mentioned Patent No.
  • Synchronising signals may besent by Wire at their natural frequency oras a modulation.
  • a lradio transmission system comprising at least one transmitter adapted. to transmit variable edge pulses' characteristic of a sound or like'wave, and Sanother 'transmitter adapted to transmit complementary iXed-edge pulses andmeans at a receiving pointfor combining the eiects of the t impulses from said transmitters in order toderive therefrom intelligence transmitted by one of said transmitters.
  • a radio transmission system according to claim 2 wherein said spaced synchronizing Limpulses have -equal durations lof th'e orderof 5% of the interval between vconse'culti-ve lones Soif-"such iimpu'ls'es.
  • a radio transmission system according to claimf2 'wherein v ⁇ said 'means for transmitting 'said'spaced synchronizing impulses vare adapted to 'transmit a '-'train of impulses having one "edge spaced at constant time Vintervals for synchronizing purposes, and further comprising lmeans 'for varying the duration ofsa'id spaced synchro- ;nizing impulses vin accordance ⁇ with la further "signaltobe transmitted. ⁇ i,
  • A- secret radio transmission system ⁇ for simultaneous ⁇ 'transmission of aplurality 'of :telepho'nic signals or the likefcomprisinga plurality of .sourcesof signals, a common fsourc'eof syn- 'chronizing pulsesa vpluralityo'f pulse modulation' means for producing under the control of each oneof said sources va correspondingiseriesof'biief pulses Whose time position in 'respect 'to that .of the synchronizing .pulses from 'said source jrepresents Vthe momentary Vamplitude of the corresponding signal, means for transmitting ⁇ all of saidse'ries of pulses on .different ⁇ carrier'Wave lengths, means forfsynchronizing said plurality of pulse modulating means, whereby the time lpositions of the pulses of the respective 'Wavelengths are all relatedto -thesame 'standard of 'time positiouandrmeans for transmitting asn
  • modulating means is located at a second'station,V
  • said means for synchronizing said pulse modulating means comprisesmeans rfor transmitting radio signals from said rst station to said second station.
  • a radio receiver of the system according ⁇ to! claim 2 comprising means for receiving" said l pulse modulated signals, meansfo'r receiving vspaced synchronizing impulses, and means,y forf ⁇ demodulating said pulse modulated signals kand. said spaced synchronizing impulses in accordance ⁇ with the time relation between rsaid spaced sine s j chronizing impulses and said modulated signals.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Organic Chemistry (AREA)
  • Biophysics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Genetics & Genomics (AREA)
  • Medicinal Chemistry (AREA)
  • Molecular Biology (AREA)
  • Proteomics, Peptides & Aminoacids (AREA)
  • Analytical Chemistry (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Transmitters (AREA)
US333945A 1939-05-30 1940-05-08 Transmission system employing pulse modulation Expired - Lifetime US2328944A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB15921/39A GB529984A (en) 1939-05-30 1939-05-30 Improvements in or relating to radio transmission systems employing pulse modulation

Publications (1)

Publication Number Publication Date
US2328944A true US2328944A (en) 1943-09-07

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US333945A Expired - Lifetime US2328944A (en) 1939-05-30 1940-05-08 Transmission system employing pulse modulation

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US (1) US2328944A (de)
BE (1) BE441446A (de)
ES (1) ES176998A1 (de)
FR (1) FR867319A (de)
GB (1) GB529984A (de)
NL (1) NL135920C (de)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2425314A (en) * 1943-09-16 1947-08-12 Rca Corp Pulse communication system
US2428582A (en) * 1942-05-21 1947-10-07 Rca Corp Radio diversity transmitter
US2429631A (en) * 1945-04-30 1947-10-28 Standard Telephones Cables Ltd Multichannel pulse modulator system
US2443958A (en) * 1944-09-23 1948-06-22 Rca Corp Modulation
US2444445A (en) * 1943-11-10 1948-07-06 Sperry Corp Radio navigation system
US2447233A (en) * 1943-04-07 1948-08-17 Standard Telephones Cables Ltd Pulse time modulation multiplex receiver
US2449819A (en) * 1944-05-29 1948-09-21 Rca Corp Multiplex radio communication
US2454773A (en) * 1943-04-07 1948-11-30 Standard Telephones Cables Ltd Pulse multiplex transmitter employing a cathode-ray tube time modulator
US2478920A (en) * 1943-08-04 1949-08-16 Rca Corp Pulse system
US2495722A (en) * 1944-10-02 1950-01-31 Standard Telephones Cables Ltd Distance indicating system
US2497958A (en) * 1942-05-21 1950-02-21 Rca Corp Communication system for ultrashort radio waves
US2528140A (en) * 1948-06-08 1950-10-31 Hastings Instr Company Inc Navigational aid
US2531919A (en) * 1946-02-06 1950-11-28 Decca Record Co Ltd Radio-frequency navigational aid
US2542700A (en) * 1942-02-20 1951-02-20 Rca Corp Pulse modulation system
US2595876A (en) * 1944-02-02 1952-05-06 Gen Electric Radio pulse-echo locating equipment
US2611826A (en) * 1947-06-05 1952-09-23 Kalfaian Meguer Simultaneous amplitude modulation and phase modulation with economy in bandwidth
US2645771A (en) * 1945-04-18 1953-07-14 Standard Telephones Cables Ltd Pulsed radio remote-control system
US2653184A (en) * 1948-01-03 1953-09-22 American Optical Corp Transmission of picture and sound on the same carrier
US2721321A (en) * 1942-04-09 1955-10-18 Radar Inc Directional antenna array

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2823385A (en) * 1954-08-16 1958-02-18 Parmelee Plastics Co Attaching structure for spectacle frame side shields

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2542700A (en) * 1942-02-20 1951-02-20 Rca Corp Pulse modulation system
US2721321A (en) * 1942-04-09 1955-10-18 Radar Inc Directional antenna array
US2428582A (en) * 1942-05-21 1947-10-07 Rca Corp Radio diversity transmitter
US2497958A (en) * 1942-05-21 1950-02-21 Rca Corp Communication system for ultrashort radio waves
US2447233A (en) * 1943-04-07 1948-08-17 Standard Telephones Cables Ltd Pulse time modulation multiplex receiver
US2454773A (en) * 1943-04-07 1948-11-30 Standard Telephones Cables Ltd Pulse multiplex transmitter employing a cathode-ray tube time modulator
US2478920A (en) * 1943-08-04 1949-08-16 Rca Corp Pulse system
US2425314A (en) * 1943-09-16 1947-08-12 Rca Corp Pulse communication system
US2444445A (en) * 1943-11-10 1948-07-06 Sperry Corp Radio navigation system
US2595876A (en) * 1944-02-02 1952-05-06 Gen Electric Radio pulse-echo locating equipment
US2449819A (en) * 1944-05-29 1948-09-21 Rca Corp Multiplex radio communication
US2443958A (en) * 1944-09-23 1948-06-22 Rca Corp Modulation
US2495722A (en) * 1944-10-02 1950-01-31 Standard Telephones Cables Ltd Distance indicating system
US2645771A (en) * 1945-04-18 1953-07-14 Standard Telephones Cables Ltd Pulsed radio remote-control system
US2429631A (en) * 1945-04-30 1947-10-28 Standard Telephones Cables Ltd Multichannel pulse modulator system
US2531919A (en) * 1946-02-06 1950-11-28 Decca Record Co Ltd Radio-frequency navigational aid
US2611826A (en) * 1947-06-05 1952-09-23 Kalfaian Meguer Simultaneous amplitude modulation and phase modulation with economy in bandwidth
US2653184A (en) * 1948-01-03 1953-09-22 American Optical Corp Transmission of picture and sound on the same carrier
US2528140A (en) * 1948-06-08 1950-10-31 Hastings Instr Company Inc Navigational aid

Also Published As

Publication number Publication date
NL135920C (de)
FR867319A (fr) 1941-10-13
BE441446A (de)
ES176998A1 (es) 1947-04-16
GB529984A (en) 1940-12-03

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