GB593731A - Receivers for pulse communication systems - Google Patents

Receivers for pulse communication systems

Info

Publication number
GB593731A
GB593731A GB8847/44A GB884744A GB593731A GB 593731 A GB593731 A GB 593731A GB 8847/44 A GB8847/44 A GB 8847/44A GB 884744 A GB884744 A GB 884744A GB 593731 A GB593731 A GB 593731A
Authority
GB
United Kingdom
Prior art keywords
valve
pulse
pulses
grid
pair
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
Application number
GB8847/44A
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
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
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB593731A publication Critical patent/GB593731A/en
Expired legal-status Critical Current

Links

Classifications

    • 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

Landscapes

  • Dc Digital Transmission (AREA)
  • Professional, Industrial, Or Sporting Protective Garments (AREA)
  • Electrotherapy Devices (AREA)
  • Noise Elimination (AREA)
  • Burglar Alarm Systems (AREA)

Abstract

593,731. Pulse modulation. STANDARD TELEPHONES & CABLES, Ltd. May 9, 1944, No. 8847. Convention date, July 3, 1942. [Class 40 (v)] In a time-modulated pulse signalling system of the kind described in Specification 592,414, in which signals are conveyed by variation of the time interval between pairs of short pulses, the received pulses are passed through a shaping circuit to a filter designed to pass a narrow band of frequencies centred around an harmonic of the pulse pair periodicity. The narrow received pulses are shaped into wider pulses which are started by either the leading or trailing edge of the received pulse and last for a constant period depending on the shaping circuit. The shaping circuit comprised a multivibrator valve pair V1, V2 with a common cathode resistance 30 and with the anode of valve V1 coupled to the grid of valve V2 through a condenser 33. The normal condition is such that valve V1 is blocked and valve V2 is passing current due to the positive bias from the source B. When the leading edge of a positive pulse is applied to the grid of the valve V1 that valve conducts, its anode voltage falls and the grid of valve V2 falls in voltage sufficiently to block the valve V2, which remains blocked for a period dependent on the time constant of condenser 33 and resistance 34. The shaped impulses are applied to a filter which passes a band of frequencies around an harmonic of the pulse - pair periodicity. The filter output is thus amplitudemodulated and may bo passed to phones &c. through an amplitude detector. A separate message may be transmitted as an amplitude modulation of the pulses.
GB8847/44A 1942-07-03 1944-05-09 Receivers for pulse communication systems Expired GB593731A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US449595A US2416328A (en) 1942-07-03 1942-07-03 Radio receiver

Publications (1)

Publication Number Publication Date
GB593731A true GB593731A (en) 1947-10-23

Family

ID=23784755

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8847/44A Expired GB593731A (en) 1942-07-03 1944-05-09 Receivers for pulse communication systems

Country Status (5)

Country Link
US (1) US2416328A (en)
BE (1) BE479581A (en)
ES (1) ES182235A1 (en)
FR (1) FR954515A (en)
GB (1) GB593731A (en)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2662174A (en) * 1942-11-25 1953-12-08 Hartford Nat Bank & Trust Co Amplitude discriminating noise reducing means
US2604608A (en) * 1942-11-28 1952-07-22 James R Moore Time wave generating system
US2480171A (en) * 1943-02-18 1949-08-30 Sperry Corp Pulse receiver system for improved target tracking
US2498675A (en) * 1943-05-24 1950-02-28 Standard Telephones Cables Ltd Radio receiver
US2474244A (en) * 1944-05-19 1949-06-28 Standard Telephones Cables Ltd Amplitude modulated time modulated pulse system
US2605460A (en) * 1944-09-20 1952-07-29 Howard C Storck Suppression system
US2467308A (en) * 1945-03-17 1949-04-12 Rca Corp Interference reducing radio pulse receiver
US2561612A (en) * 1945-05-10 1951-07-24 Honeywell Regulator Co Cathode-ray tube apparatus for comparing two electrical signals
US2467793A (en) * 1945-05-19 1949-04-19 Westinghouse Electric Corp Radio communication system
US2573354A (en) * 1945-07-26 1951-10-30 Rca Corp Variable frequency multivibrator
US2509064A (en) * 1945-08-23 1950-05-23 Bell Telephone Labor Inc Reduction of noise in pulse position modulation systems
US2507351A (en) * 1945-11-23 1950-05-09 Well Surveys Inc Transmitting of information in drill holes
US2525634A (en) * 1945-12-07 1950-10-10 Rca Corp Pulse communication system
US2578557A (en) * 1946-01-25 1951-12-11 Rca Corp Electric timing device
US2597029A (en) * 1946-09-21 1952-05-20 Int Standard Electric Corp Superheterodyne radio receiver employing a multifunction tube
US2623994A (en) * 1947-02-17 1952-12-30 Patelhold Patentverwertung Receiver for time modulated pulses
US2623173A (en) * 1947-06-05 1952-12-23 Gen Teleradio Inc Television phase-actuated control equipment
US2456026A (en) * 1947-06-14 1948-12-14 Rca Corp Modulator employing trigger circuit
US2740043A (en) * 1952-03-03 1956-03-27 John E Williams Electronic linear sweep generator

Family Cites Families (2)

* 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
BE432538A (en) * 1938-04-11

Also Published As

Publication number Publication date
FR954515A (en) 1950-01-03
US2416328A (en) 1947-02-25
ES182235A1 (en) 1948-04-01
BE479581A (en)

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