US2476959A - Pulse signaling system - Google Patents

Pulse signaling system Download PDF

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Publication number
US2476959A
US2476959A US591270A US59127045A US2476959A US 2476959 A US2476959 A US 2476959A US 591270 A US591270 A US 591270A US 59127045 A US59127045 A US 59127045A US 2476959 A US2476959 A US 2476959A
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United States
Prior art keywords
pulses
frequency
generator
wave
amplitude
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Expired - Lifetime
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US591270A
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English (en)
Inventor
Chatterjea Prafulla Kumar
Scully Charles Thomas
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International Standard Electric Corp
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International Standard Electric Corp
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Publication date
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K7/00—Modulating pulses with a continuously-variable modulating signal
    • H03K7/08—Duration or width modulation ; Duty cycle modulation

Definitions

  • the present invention relates to electrical pulse signalling systems and has'forl itsobject to'pro'- videarrangements Vfor producing electrical pulsesl particularly timephase and duration-modulated pulses: Whoseunmod'ulated duration is very short, that is-very short compared to the repetition period of the-pulses, for example, of theorder of V"104725.
  • an arrange*- mentl for producing modulated electrical pulses comprises a normally inoperative or quiescent oscillation generator, which is-rendered operative olfactive byl a repetitive wave ofthe desired pulsefrequen'cy .once perV ⁇ period ofthe said' repetitive Wave; means-fonvaryingv a'factor of the arrangement Which'aiects a characteristic' of theigeneratedf Aoscillations by a modulation signal wave; forexample, varying the frequency of the repeti-V tive Wave to produce time-phasefmodul-ated pulses; or'thefrequency of the generatedA oscillations to producefduratiion'modulated pulses andl means for eliminatingtheposi-tivefor negative halfv cycles of the generated oscillations.
  • the frequencyv of the generated' oscillations is varied in accordance With'the amplitude of a' signal wave,- for example, by' varying the frequencydetermin-ingcircuitof the oscillation-gem erator.
  • the source-of 'pulse-'repetition frequency is frequency or phase 'modulated' inaccordance with the amplitude-of' a'signal" wave.
  • the frequency .of the oscillation generator is maintained Aconstant vbut the oscillations are generated at intervalsvv dependingrupon the frequency vof ⁇ thesource. ⁇
  • the pulses in theoutput of'the oscillation generator maybe shapedvin any. desired manner.
  • the arrangement comprises'anelectron discharge device oscillation, generator repre? sented as a triode Vl with a frequency determining circuit comprisingparallel connected induce tance'Ll and capacity'Cl connected in the anode circuit Vand coupled for regenerative feedback to the grid by inductive coupling'coil L2.
  • the auxiliary driving source 'Sofi the desired pulse repetition fre quency; This .sourcemay comprise a sinusoidal but'preferably'sawv tooth or other peak form of repetition. wave and the grid biasof the.
  • valve VI is so;ad;usted that normally Vl is nonconductive but when the wave from auxiliary source S is applied, the valve becomesconductive and the oscillator becomes operativeat some point in the cycle of the wave.
  • rlhe period of the oscillator is. adjusted vto be. twice the. desired duration o the required pulses and the amplitude of the waverom source -S' is adjusted, to be such that the oscillator is operative for notV more than a perodof the generated frequency and for not less than half' said period.
  • a rectifier D is connectedacross the frequency determining ⁇ circuit Ll, C'I ⁇ of Vvalve Vl to absorb or eliminate alternate half cycles of the generated oscillation.
  • the bias on VI is. obtained by means of the resistancechain r2, .T31 connected across thehigh tension supply, and ,by varyingAV the relative values of r2 and r3; as will'be Well'understood. Resistancey His connected Vin the grid circuit, and the condenser ⁇ C2 is connected across r2 as is usual andV well known, The output pulses are taken fromjthe anode terminal shown atO.
  • a pentode valve V2 is connected across the valve oscillator circuit, that is, across the valve Vl and circuit LlC I in series and the modulating signal wave which may, for example, v
  • the control grid Gl of the pentode V2 is applied to the control grid Gl of the pentode V2 to provide the capacity variation as is well known.
  • the period of the oscillations generated in the oscillator varieswith the signal wave amplitude and hence the pulses produced in the anode circuit, which consist of alternate half cycles of the oscillations are duration modulated'in accordance with the amplitude variation of the signal modulating wave.
  • the half -oscillation pulses may be shaped into rectangular form by any known means, such as already stated, in the well known manner of amplifying and amplitude limiting.
  • the arrangement shown in Figure 2 may be used.
  • parts the same as those in Figure 1 are given like designations.
  • the valve V2 is omitted, and the frequency of the generated oscillations remains constant.
  • any known means is provided for frequency or phase modulating the source VS Whose mean frequency is the desired pulse repetition frequency, by means of the modulating signal wave from source
  • the source lS takes the form of a variable frequency oscillation generator, the waves being applied to control the operation of the oscillator.
  • means may be provided to maintain the frequency constant so that the duration of the output pulses ⁇ is maintained strictly constant.
  • the pulses in the output of the arrangement shown in Figure 2 may be amplied and amplitude limited to produce pulses of rectangular wave form.
  • the reactance valve V2 is required to present inductive or capacitive reactance in practice depending upon the type of oscillator circuit employed as well as the part of the circuit controlled by the reactance valve. l
  • the pulse repetition frequency from source S may be applied to other electrodes than 4 the control grid, for example to the suppressor grid and/or screen grid.
  • An arrangement for producing modulated electrical pulses comprising a normally inoperative oscillation generator, a source of repetitive waves, of the desired pulse frequency, means for applying waves from said source to said generator to render it operative once per period of the said repetitive wave, a source of signal waves, means for varying by modulating with the signal waves from said source a factor of the system which affects a characteristic of the generated oscillations, and means forY eliminating half-cycles of the generated oscillations of a given polarity.
  • An arrangement for producing modulated electrical pulses comprising an oscillation generator Vwhose period is twice the desired mean pulse duration, bias means for rendering said generator normally inoperative, an auxiliary generator of waves of pulse repetition frequency, means for applying the output of said auxiliary generator to render said oscillation generator operative once every repetitionperiod, means for eliminating alternate half cycles of the generated oscillations fromrsaid oscillation generator and means for varying the frequency of one of said generators in accordance Vwith the amplitude of a modulating signal.
  • An arrangement for', producing duration modulated electrical pulses comprising an oscillation generator of higher frequency than the pulse repetition frequency, bias means'for rendering said generator normally inoperative, ⁇ an auxiliary source of waves of pulse repetition frequency, means forapplying the output of said- Y auxiliary source to render theA said generator operative once. every said repetition period, means for eliminating half cycles of the generated oscillations of given polarity and means for varying the frequency of the generatedv oscillations in accordance with the amplitude of a modulating signal wave.
  • An arrangement for producing time-phase modulated electrical pulses comprising an oscillation generator of higherrfrequency than the mean pulse repetition frequency, bias means for rendering said generator Vnormally inoperative, an auxiliary source of waves of pulse repetition frequency, means for applying the output of said auxiliary source to render said generator operative once every said repetition period, means for eliminating half cycles of the generated oscillations of a given polarity and means modulatingV the angular velocity of the' waves of said auxiliary source in accordance with the amplitude of a modulating signal.
  • ysaid oscillation generator comprises an electron discharge device whose grid is negatively biassed to render said generator normally inoperative, and means for applying the said repetitive wave form to said grid to overcome the negativeV biasy and render said generator operative.

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  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)
US591270A 1944-05-02 1945-05-01 Pulse signaling system Expired - Lifetime US2476959A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB269670X 1944-05-02

Publications (1)

Publication Number Publication Date
US2476959A true US2476959A (en) 1949-07-26

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ID=10252004

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US591270A Expired - Lifetime US2476959A (en) 1944-05-02 1945-05-01 Pulse signaling system

Country Status (6)

Country Link
US (1) US2476959A (enrdf_load_stackoverflow)
BE (1) BE468180A (enrdf_load_stackoverflow)
CH (1) CH269670A (enrdf_load_stackoverflow)
FR (1) FR930523A (enrdf_load_stackoverflow)
GB (1) GB580769A (enrdf_load_stackoverflow)
NL (1) NL133836C (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2578467A (en) * 1948-06-10 1951-12-11 Ericsson Telefon Ab L M Device for generation and modulation of impulses
US2601096A (en) * 1950-12-29 1952-06-17 Philco Corp Modulator
US2652539A (en) * 1945-11-27 1953-09-15 Joseph W Kearney Method and means for wide band frequency modulation
US2695954A (en) * 1949-12-24 1954-11-30 Stromberg Carlson Co Pulse modulation reconstructor circuit
US2728049A (en) * 1954-08-23 1955-12-20 California Inst Res Found Reactive modulation circuit

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2113214A (en) * 1936-10-29 1938-04-05 Rca Corp Method of frequency or phase modulation
US2139432A (en) * 1935-02-06 1938-12-06 Telefunken Gmbh Oscillation producing system
US2181309A (en) * 1935-04-09 1939-11-28 Telefunken Gmbh Electrical impulse segregation circuit
US2181568A (en) * 1936-02-04 1939-11-28 Telefunken Gmbh Impulse or pulse transmitter
US2278429A (en) * 1939-12-27 1942-04-07 Rca Corp Reactance tube modulation
US2420374A (en) * 1944-07-01 1947-05-13 Rca Corp Pulse multiplex transmission system
US2422231A (en) * 1944-12-06 1947-06-17 Union Switch & Signal Co Pulse generating receiver for coded carrier signals

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2139432A (en) * 1935-02-06 1938-12-06 Telefunken Gmbh Oscillation producing system
US2181309A (en) * 1935-04-09 1939-11-28 Telefunken Gmbh Electrical impulse segregation circuit
US2181568A (en) * 1936-02-04 1939-11-28 Telefunken Gmbh Impulse or pulse transmitter
US2113214A (en) * 1936-10-29 1938-04-05 Rca Corp Method of frequency or phase modulation
US2278429A (en) * 1939-12-27 1942-04-07 Rca Corp Reactance tube modulation
US2420374A (en) * 1944-07-01 1947-05-13 Rca Corp Pulse multiplex transmission system
US2422231A (en) * 1944-12-06 1947-06-17 Union Switch & Signal Co Pulse generating receiver for coded carrier signals

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2652539A (en) * 1945-11-27 1953-09-15 Joseph W Kearney Method and means for wide band frequency modulation
US2578467A (en) * 1948-06-10 1951-12-11 Ericsson Telefon Ab L M Device for generation and modulation of impulses
US2695954A (en) * 1949-12-24 1954-11-30 Stromberg Carlson Co Pulse modulation reconstructor circuit
US2601096A (en) * 1950-12-29 1952-06-17 Philco Corp Modulator
US2728049A (en) * 1954-08-23 1955-12-20 California Inst Res Found Reactive modulation circuit

Also Published As

Publication number Publication date
FR930523A (fr) 1948-01-28
BE468180A (enrdf_load_stackoverflow)
GB580769A (en) 1946-09-19
CH269670A (fr) 1950-07-15
NL133836C (enrdf_load_stackoverflow)

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