US2500536A - Pulse-time demodulator - Google Patents

Pulse-time demodulator Download PDF

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Publication number
US2500536A
US2500536A US731197A US73119747A US2500536A US 2500536 A US2500536 A US 2500536A US 731197 A US731197 A US 731197A US 73119747 A US73119747 A US 73119747A US 2500536 A US2500536 A US 2500536A
Authority
US
United States
Prior art keywords
pulse
condenser
pulses
voltage
tube
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
US731197A
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English (en)
Inventor
Goldberg Harold
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.)
Bendix Aviation Corp
Original Assignee
Bendix Aviation Corp
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 FR963718D priority Critical patent/FR963718A/fr
Application filed by Bendix Aviation Corp filed Critical Bendix Aviation Corp
Priority to US731197A priority patent/US2500536A/en
Priority to GB4957/48A priority patent/GB650471A/en
Application granted granted Critical
Publication of US2500536A publication Critical patent/US2500536A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K9/00—Demodulating pulses which have been modulated with a continuously-variable signal
    • H03K9/06—Demodulating pulses which have been modulated with a continuously-variable signal of frequency- or rate-modulated pulses

Definitions

  • This invention is directed to pulse-time de- More specifically it is directed to an arrangement for detecting the intelligence transmitted on a pulse-time modulated carrier.
  • Fig. 1 is a schematic diagram of a circuit embodying the invention.
  • Fig. 2 is a graph comprising a family of related curves illustrating voltage conditions existing at various points in the circuit of Fig. 1 during the operation thereof.
  • a source 10 of positive pulse signals coupled to the control electrode II of a vacuum tube I2 through a condenser 13.
  • the electrode 1! is connected to the grounded cathode 14 through a resistor l5 and a bias battery 16.
  • the battery is so poled as to maintain the tube l2 in a non conducting state between pulses of the source Ill.
  • the anode ll of the tube 12 is connected through a resistor I8 to a source of positive voltage indicated +B, to the control electrode 19 of a tube 29, and through a condenser 2
  • the anode 22 of the tube is directly connected to a source of positive voltage +3.
  • the cathode 23 of the tube 20 is connected to ground through a parallel circuit comprising a condenser 24 and a resistor 25. Circuit connections are provided from the cathode 23 to the cathode 26 of a tube 21 and to the anode 28 of a tube 29. The anode 30 of the tube 21 and the cathode 3
  • control electrodes 38 and 39 of the tubes 21 and 29, respectively are tied together, and, thence, through a resistor 40 to the source 10 of pulse signals.
  • cathode follower tube 2! is conductive, and the voltage across the parallel circuit 24, 25 is rising, as shown at 1B, and following, by cathode-follower action, the voltage across the condenser 2!.
  • the tubes 21 and 29, which comprise a bidirectional switch are non-conductive, and the voltage across the condenser 36, and consequently the voltage across the output terminals 31, is held at a relatively constant value, as illustrated at 80.
  • This constant value is approximately equal to the voltage which was present across the condenser 24 at the instant of the start of the pre vious input pulse, as will be explained hereinbelow.
  • the signal at the output terminals comprises a step function which is a close approximation to the original modulation, and depends solely on the spacing between the input pulses.
  • the train of pulses shown in 1 curve A of Fig. 2 are modulated by an abrupt change in their repetition period which follows pulse 52. Thismodulation is accurately recovered in the amplitude excursions of the voltage,
  • a source of energy pulses modulated in repetition period a saw tooth wave 1 generator excited by said pulses; means operat- 1 ing on the output of said generator to decrease the slope of the trailing edges of the saw tooth excursions thereof; an energy storage circuit; and
  • p means actuated by said pulses to momentarily connect said energy storage means to said Slpe changing means during each of said pulses.
  • a source of energy pulses modulated in repetition period means generating a saw tooth wave form, the amplitude of the excursions of which is a function of the modulation of said pulse period; means operating on said wave form to decrease the slope of the trailing edges of said excursions; an energy storage circuit; and means actuated by said pulses to momentarily connect said energy storage circuit to said slope changing means during each of said pulses.
  • a source of energy pulses modulated in repetition period means generating a saw tooth wave form, the amplitude of th excursions of which is a function of the modulat tion of said pulse period; means operating on said wave form to decrease the slope of the trailing edges of said excursions; an energy storage circuit; means connecting said energy storage circuit to said slope changing means, said connecting means including an electronic switch, said switch normally interrupting said connecting means; and means applying said pulses to said switch, whereby said connecting means is momentarily completed during each of. said pulses,
  • a condenser In combination, a condenser; a charging; cirflcuit for said condenser including a source of unidirectional energy and an impedance; a discharge circuit for said condenser including the space discharge path of a normally non-conducting electron tube; a source of energy pulses modulated in repetition period; means impressing said Pulses upon said tube to render it conductive during each of said pulses; a cathode follower circuit including an electron discharge tube having an anode, a

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  • Electrotherapy Devices (AREA)
  • Amplifiers (AREA)
  • Amplitude Modulation (AREA)
US731197A 1947-02-27 1947-02-27 Pulse-time demodulator Expired - Lifetime US2500536A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
FR963718D FR963718A (sv) 1947-02-27
US731197A US2500536A (en) 1947-02-27 1947-02-27 Pulse-time demodulator
GB4957/48A GB650471A (en) 1947-02-27 1948-02-19 Pulse-time demodulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US731197A US2500536A (en) 1947-02-27 1947-02-27 Pulse-time demodulator

Publications (1)

Publication Number Publication Date
US2500536A true US2500536A (en) 1950-03-14

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ID=24938490

Family Applications (1)

Application Number Title Priority Date Filing Date
US731197A Expired - Lifetime US2500536A (en) 1947-02-27 1947-02-27 Pulse-time demodulator

Country Status (3)

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US (1) US2500536A (sv)
FR (1) FR963718A (sv)
GB (1) GB650471A (sv)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2652490A (en) * 1949-11-17 1953-09-15 Gen Electric Co Ltd Thermionic valve integrating circuits
US2694145A (en) * 1947-05-23 1954-11-09 Clevite Corp Demodulator apparatus
US2699498A (en) * 1946-03-26 1955-01-11 John H Guenther Pulse time demodulator
US2708718A (en) * 1952-11-26 1955-05-17 Hughes Aircraft Co Phase detector
US2755380A (en) * 1951-01-20 1956-07-17 Northrop Aircraft Inc Demodulator
US2790903A (en) * 1952-02-20 1957-04-30 Hazeltine Research Inc Signal-translating circuit
US2836718A (en) * 1954-05-12 1958-05-27 Hughes Aircraft Co Pulse amplitude multiplier
US2880316A (en) * 1955-03-21 1959-03-31 John M Wozencraft Active filters
US2880332A (en) * 1955-06-16 1959-03-31 North American Aviation Inc Transistor flip-flop circuit
US2882354A (en) * 1957-02-21 1959-04-14 Max J Ruderian Direct coupled amplifier utilizing sampling method
US2883650A (en) * 1953-08-21 1959-04-21 Bendix Aviat Corp System for reproducing a varying d. c. voltage at a distance
US2891154A (en) * 1956-11-30 1959-06-16 Julian C Holmes Pulse demodulator
US2910583A (en) * 1956-07-23 1959-10-27 Ibm Timed pulse delay circuit
US3025470A (en) * 1958-01-15 1962-03-13 Sperry Rand Corp Pulse position demodulator
US3064208A (en) * 1961-01-05 1962-11-13 Bell Telephone Labor Inc Variable frequency pulse generator
DE1139546B (de) * 1956-04-25 1962-11-15 Westinghouse Electric Corp Relaislose Verzoegerungsschaltung mit Transistoren
US3069559A (en) * 1957-12-03 1962-12-18 Atomic Energy Authority Uk Circuits for sampling oscilloscopes
US3248559A (en) * 1961-07-21 1966-04-26 Litton Systems Inc Detection circuit

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2275930A (en) * 1938-03-11 1942-03-10 Csf Call selector
US2335265A (en) * 1942-07-22 1943-11-30 Scophony Corp Of America Phase discriminator
US2413023A (en) * 1944-01-06 1946-12-24 Standard Telephones Cables Ltd Demodulator
US2416286A (en) * 1942-10-07 1947-02-25 Standard Telephones Cables Ltd Signal transmission system
US2436890A (en) * 1945-01-24 1948-03-02 Nasa Modulated saw-tooth sweep generator

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2275930A (en) * 1938-03-11 1942-03-10 Csf Call selector
US2335265A (en) * 1942-07-22 1943-11-30 Scophony Corp Of America Phase discriminator
US2416286A (en) * 1942-10-07 1947-02-25 Standard Telephones Cables Ltd Signal transmission system
US2413023A (en) * 1944-01-06 1946-12-24 Standard Telephones Cables Ltd Demodulator
US2436890A (en) * 1945-01-24 1948-03-02 Nasa Modulated saw-tooth sweep generator

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2699498A (en) * 1946-03-26 1955-01-11 John H Guenther Pulse time demodulator
US2694145A (en) * 1947-05-23 1954-11-09 Clevite Corp Demodulator apparatus
US2652490A (en) * 1949-11-17 1953-09-15 Gen Electric Co Ltd Thermionic valve integrating circuits
US2755380A (en) * 1951-01-20 1956-07-17 Northrop Aircraft Inc Demodulator
US2790903A (en) * 1952-02-20 1957-04-30 Hazeltine Research Inc Signal-translating circuit
US2708718A (en) * 1952-11-26 1955-05-17 Hughes Aircraft Co Phase detector
US2883650A (en) * 1953-08-21 1959-04-21 Bendix Aviat Corp System for reproducing a varying d. c. voltage at a distance
US2836718A (en) * 1954-05-12 1958-05-27 Hughes Aircraft Co Pulse amplitude multiplier
US2880316A (en) * 1955-03-21 1959-03-31 John M Wozencraft Active filters
US2880332A (en) * 1955-06-16 1959-03-31 North American Aviation Inc Transistor flip-flop circuit
DE1139546B (de) * 1956-04-25 1962-11-15 Westinghouse Electric Corp Relaislose Verzoegerungsschaltung mit Transistoren
US2910583A (en) * 1956-07-23 1959-10-27 Ibm Timed pulse delay circuit
US2891154A (en) * 1956-11-30 1959-06-16 Julian C Holmes Pulse demodulator
US2882354A (en) * 1957-02-21 1959-04-14 Max J Ruderian Direct coupled amplifier utilizing sampling method
US3069559A (en) * 1957-12-03 1962-12-18 Atomic Energy Authority Uk Circuits for sampling oscilloscopes
US3025470A (en) * 1958-01-15 1962-03-13 Sperry Rand Corp Pulse position demodulator
US3064208A (en) * 1961-01-05 1962-11-13 Bell Telephone Labor Inc Variable frequency pulse generator
US3248559A (en) * 1961-07-21 1966-04-26 Litton Systems Inc Detection circuit

Also Published As

Publication number Publication date
FR963718A (sv) 1950-07-19
GB650471A (en) 1951-02-28

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