US2604592A - Pulse demodulator system - Google Patents

Pulse demodulator system Download PDF

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Publication number
US2604592A
US2604592A US781031A US78103147A US2604592A US 2604592 A US2604592 A US 2604592A US 781031 A US781031 A US 781031A US 78103147 A US78103147 A US 78103147A US 2604592 A US2604592 A US 2604592A
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US
United States
Prior art keywords
pulses
pulse
time
duration
circuit
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Expired - Lifetime
Application number
US781031A
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English (en)
Inventor
Arnold M Levine
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.)
STC PLC
Federal Telephone and Radio Corp
Original Assignee
Standard Telephone and Cables PLC
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
Priority to BE513508D priority Critical patent/BE513508A/xx
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to US781031A priority patent/US2604592A/en
Application granted granted Critical
Publication of US2604592A publication Critical patent/US2604592A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K9/00—Demodulating pulses which have been modulated with a continuously-variable signal
    • H03K9/04—Demodulating pulses which have been modulated with a continuously-variable signal of position-modulated pulses

Definitions

  • This invention relates to pulse demodulation systems andmore particularly to pulse translator or demodulator systems for' the translation or demodulationcf time displaced pulses into other forms'.
  • pulses may be produced-l in responseftor a marker pulse or by other means, having a substantially constamt time ⁇ duration, gthese' pulses' corresponding in number to the-numberfof pulses.l of time displacement energy-an'd overlying in time the positionI of. thesetime displaced pulses. rThese constant time duration pulsesand the time displaced pulses aref applied Acon-jointly to ai circuit vto provide a termination-.forthcfixed pulsesat some interval ⁇ intermediateits normal duration to provide-resultant; pulses. having time vdurations. corresponding to the time displacementmodulation of the received pulses.
  • the combination of the pulses may be effected a gating tube which may serve at the saine time as a selector for theV pulses of a desiredchannel4 of amultiplex pulse system, v,cl'rrcut ier accomplish s calms. (umso- 27) ing thel resultsof myinvention includes alsol subordinate features relating to the shaping ofthe givenduration pulses-forthe purpose of securing the desired output results vand. the complete. system Will ⁇ include Iilters forthe reproduction of the ⁇ original signal envelope.v Y
  • vMore specifically the base wave ⁇ or selector pulse derived from ⁇ the received waves .or produced locally-is nrstpassed through a circuit which by amplification: and clipping Will produce trains of rectangular pulses having a-substantial-ly constant time duration. These pulses are passed through a circuit to suitable shaping and lter apparatus. Inf shunt to the'crcuit passing these constant duration pulses is provided a gating tube, to the grid-cathode circuit of which may bev applied theI rectangular constant duration pulses: This; tubemormally is biased so that it Vwill not-pass the normal channel pulses in the absence lofwtlfieapplication 0f'- this rectangular pulse to" the grid.
  • the channel -pulses are also applied to the grid vcathodecircuit and the pulses which arrive coincident with the'- rectangular pulse will serve to render the tubeeonductive, cuttingofi" the rectangular pulse atthe-time'of application of the channel pulse.
  • the output Wave from receiver I is appliedy to ai'marker'or'refer- ⁇ ence pulse selector and pulse; Shaper' 'l Which serves toselect marker orreference-pulsexll and shape it lto some desi-red ⁇ form.
  • an inductance coil I4 is provided which serves effectively to steepen the leading and trailingedges of the pulse I2 in the output circuit.
  • Tube I3 may serve as a clipper circuit to clip pulse I2 at the level indicated by dotted line I6 on the curve I2.
  • a rectiiier I may serve to clip pulse I2to eliminate noise near the upper portion' thereof.
  • a rsecond. v by-pass rectifier I1 is provided shunting coil I4 to I c remove any residual negative voltages which may result from the inductive action of coil I4.
  • This pulse v has a substantially constant time duration and in view of the operation ⁇ of distributor 8 is properly timed with ⁇ respect to the incoming channel pulse so thatit will overlie the time position of a channelvpulsesuch as 5' for example, regardless of its'time displacement.
  • the time duration of pulses I8 is not critical but should be chosen so as not to overlap the time period of any of the other channel pulses.
  • This output pulse is applied over leads I 9 directly to the grid-cathode circuit of a tube 26.
  • the pulse vvis also passed through coupling condenser 2I directly to the anode output circuit of tube 2l).
  • the pulse as passed through coupling condenser 2I is previously subjected to a voltage divider action throughthe' medium of condensers 22 and 23.
  • Condenser v23 is made variable and is shunted by a resistor 24 so that the resulting pulse passed to condenser 2I may be controlled in shape.
  • Adjustment of condenser'23 changes the slope of the top portion of the output pulse shown at 25 in accordance with the dotted line indications of 26 and 2'I to correct distortion in the pulse or to compensate -for distortion which may occur in succeeding circuits.
  • the output-pulses from receiver I are also applied over line 28 to the grid cathode circuit of tube over cathode resistor 29.
  • pulses would appear in the output circuitY of tube 20 as trains of pulses of constantduration.
  • tube 20 is rendered conductive and the plate voltage therefore is caused to drop, serving to cut oi or Vterminate pulses 25 at a time corresponding to the application of the pulse 5.
  • a time constant circuit -consisting of resistors 38 and a coupling condenser'3I in the output of tube 20 serves to elongate the negative voltage existing at the plate for a periodv corresponding to the maximum remaining time duration of pulses 25 to assure that the entire portion of the pulse occurring subsequently to the application of a channel pulse 5 is eliminated.
  • Pulse 32 is clipped at level 33 in a clipper-Shaper circuit 34 to provide output pulses 35 having time duration depending upon the time ofarriv'al kof the channel pulse 5.
  • the output pulses 35 will correspondingly vary in width or time duration.
  • These variable time duration pulses 35 may then' be applied to an audio filter 36 to remove the high frequency components and reproduce the original audio frequency wave.-
  • the output Waves from lter 36 may then be applied to any desired utilization circuit 31.
  • the: output pulse from clipper Shaper 34 may be ap plied directly tojsuch further transmission cir-- cuit... -v ,L .Y 1M T 4 While I have described above the principles of Amy invention in connection with specic apparatus, it is to be clearly understood that this description is made only by way of example and not as aY limitation to thepscope of my invention.
  • a pulse receiver system for receiving a Wave consisting of successive time displaced modulation channelpulses .comprising means for producing a wave of negative pulses time displaced to correspond with the time displaced pulses and of a substantially rectangular form of substantially constant time' duration, voltage divider means for selecting alr predetermined portion of said recjtangular pulses, anelectron discharge tube having anode, cathode and grid electrodes having its anode circuit coupled to the output of said voltage divider means, a coupling circuit for applying each of said 'substantially rectangular pulses .to the grid circuit of said ⁇ electron discharge device, said electronl discharge device being normallyv biased beyond cutoff and saidrectangular pulse serving toreduce said bias but being insufllcient in amplitude to render said tube'conductive, a coupling circuity for applying said channel pulses to the grid cathode circuit of said tube wherebyv saidube will be'rendered conductive upon simulA taneousapplication ⁇ of a channel pulse and a.
  • a system for translating pulses of variable timeY displacement'intopulses of time duration corresponding to the time displacementof the individual pulses comprising means for providing pulses of a given time duration and corresponding in number to and ⁇ overlying in time position each ofsaidfpulse's Yof--variab1e time displacement, a transmission path for normally passing said con stant duration l' pulses, a normally inoperative shunting circuit 4coupled to' said transmission path, said shunting circuit having an electron dis# charging device having'v an anode circuit coupled to said transmission path to shunt said path upon conduction of said device and an input grid-cathode circuit to which are simultaneously applied said constantlduration pulsesfand said time displaced pulses to render said electronv discharge device' conductive upon coincidence of such pulses and thereby terminate each of said given duration pulses in accordance with the time position of the corresponding time displaced pulse.
  • a 'system according to claim 2 wherein said shunting Acircuit further includes a time constant circuit having a time'constant at least as great as the remaining time duration of said Vgiven duration pulse to'assure 'that the entire portion of the constant duration pulse, occurring subsequently to ⁇ the application of he variable time displaced pulse, is eliminated.
  • said transmission path further includes a voltage divider in advance of said electron discharge device and coupled to the anode circuit thereof, whereby only such amplitude portion of each of said given time duration pulses is passed by said voltage divider that only when applied to said electron discharge device simultaneously with the application of a variable time displaced pulse, will render said electron discharge device conductive.
  • said voltage divider includes a variable condenser and a shunt resistor to control the shape of said given time'duration pulses and compensate for distortion in the said pulse.

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US781031A 1947-10-21 1947-10-21 Pulse demodulator system Expired - Lifetime US2604592A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
BE513508D BE513508A (nl) 1947-10-21
US781031A US2604592A (en) 1947-10-21 1947-10-21 Pulse demodulator system

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US781031A US2604592A (en) 1947-10-21 1947-10-21 Pulse demodulator system

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US2604592A true US2604592A (en) 1952-07-22

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2892080A (en) * 1953-11-10 1959-06-23 Westinghouse Electric Corp Limiter for radio circuits
US3041546A (en) * 1960-05-03 1962-06-26 Ibm Pulse synchronizer

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2262838A (en) * 1937-11-19 1941-11-18 Int Standard Electric Corp Electric signaling system
US2403210A (en) * 1942-12-04 1946-07-02 Butement William Alan Stewart Multiplex pulse modulation system
US2405876A (en) * 1943-06-30 1946-08-13 Rca Corp Variable dot keyer
GB587942A (en) * 1944-05-26 1947-05-09 Standard Telephones Cables Ltd Improvements relating to demodulation arrangements in electrical pulse modulation communication systems
US2454815A (en) * 1944-10-03 1948-11-30 Standard Telephones Cables Ltd Multichannel pulse communication system employing complex multivibrator modulators
US2462100A (en) * 1946-04-18 1949-02-22 Fed Telecomm Lab Inc Demodulator system for time modulated pulses
US2489302A (en) * 1944-05-26 1949-11-29 Int Standard Electric Corp Multichannel time modulated electrical pulse communication system

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2262838A (en) * 1937-11-19 1941-11-18 Int Standard Electric Corp Electric signaling system
US2403210A (en) * 1942-12-04 1946-07-02 Butement William Alan Stewart Multiplex pulse modulation system
US2405876A (en) * 1943-06-30 1946-08-13 Rca Corp Variable dot keyer
GB587942A (en) * 1944-05-26 1947-05-09 Standard Telephones Cables Ltd Improvements relating to demodulation arrangements in electrical pulse modulation communication systems
US2489302A (en) * 1944-05-26 1949-11-29 Int Standard Electric Corp Multichannel time modulated electrical pulse communication system
US2454815A (en) * 1944-10-03 1948-11-30 Standard Telephones Cables Ltd Multichannel pulse communication system employing complex multivibrator modulators
US2462100A (en) * 1946-04-18 1949-02-22 Fed Telecomm Lab Inc Demodulator system for time modulated pulses

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2892080A (en) * 1953-11-10 1959-06-23 Westinghouse Electric Corp Limiter for radio circuits
US3041546A (en) * 1960-05-03 1962-06-26 Ibm Pulse synchronizer

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Publication number Publication date
BE513508A (nl)

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