GB535701A - Improvements in or relating to pulse modulation systems - Google Patents

Improvements in or relating to pulse modulation systems

Info

Publication number
GB535701A
GB535701A GB27849/39A GB2784939A GB535701A GB 535701 A GB535701 A GB 535701A GB 27849/39 A GB27849/39 A GB 27849/39A GB 2784939 A GB2784939 A GB 2784939A GB 535701 A GB535701 A GB 535701A
Authority
GB
United Kingdom
Prior art keywords
circuit
target
control element
carrier
pulse
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
GB27849/39A
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
Priority to BE441588D priority Critical patent/BE441588A/xx
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB27849/39A priority patent/GB535701A/en
Priority to US353688A priority patent/US2300394A/en
Priority to FR867844D priority patent/FR867844A/en
Publication of GB535701A publication Critical patent/GB535701A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K7/00—Modulating pulses with a continuously-variable modulating signal
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J31/00—Cathode ray tubes; Electron beam tubes
    • H01J31/02—Cathode ray tubes; Electron beam tubes having one or more output electrodes which may be impacted selectively by the ray or beam, and onto, from, or over which the ray or beam may be deflected or de-focused
    • H01J31/04—Cathode ray tubes; Electron beam tubes having one or more output electrodes which may be impacted selectively by the ray or beam, and onto, from, or over which the ray or beam may be deflected or de-focused with only one or two output electrodes with only two electrically independant groups or electrodes

Landscapes

  • Particle Accelerators (AREA)
  • Radiation-Therapy Devices (AREA)
  • X-Ray Techniques (AREA)

Abstract

535,701. Modulating systems. STANDARD TELEPHONES & CABLES, Ltd., BEATTY, W. A., and SCULLY, C. T. Oct. 13, 1939, No. 27849. [Class 40 (v)] Pulses of the kind utilized in the signalling systems described in Specifications 523,575 and 524,671 are modulated on a carrier wave by causing the wave to vary the intensity of the beam of a cathode-ray tube by which a sound or like signal is converted into pulses. The beam from a cathode 11 passes through a control element 12, focusing anode 13, anode 14, deflecting plates 15, and a ring 16 formed of spongy carbon, to the target 17. The modulating signal voltages are applied to one pair of plates 15, and time-base voltages to the other pair. The beam thus strikes the target 17 for a variable period during each cycle of the time base. The carrier is applied from the circuit 19 to the control element 12 to vary the intensity of the beam, and sets up carrier current in the target circuit 22 so long as the beam is striking the target 17. The output circuit 25 is fed by the circuit 22, and may feed the aerial through frequency-multipliers. Where one edge of each pulse has an amplitude different from the remainder of the pulse, a second target 18 is connected to a further tuned circuit 27 so coupled to the final circuit 25 as to produce the desired amplitude difference. During the fly back period of the time base, the beam may be suppressed by biasing the control element 12 or the generation of the carrier wave may be interrupted.
GB27849/39A 1939-10-13 1939-10-13 Improvements in or relating to pulse modulation systems Expired GB535701A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
BE441588D BE441588A (en) 1939-10-13
GB27849/39A GB535701A (en) 1939-10-13 1939-10-13 Improvements in or relating to pulse modulation systems
US353688A US2300394A (en) 1939-10-13 1940-08-22 Pulse modulation system
FR867844D FR867844A (en) 1939-10-13 1940-11-29 Modulated carrier wave transmission systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB27849/39A GB535701A (en) 1939-10-13 1939-10-13 Improvements in or relating to pulse modulation systems

Publications (1)

Publication Number Publication Date
GB535701A true GB535701A (en) 1941-04-18

Family

ID=10266304

Family Applications (1)

Application Number Title Priority Date Filing Date
GB27849/39A Expired GB535701A (en) 1939-10-13 1939-10-13 Improvements in or relating to pulse modulation systems

Country Status (4)

Country Link
US (1) US2300394A (en)
BE (1) BE441588A (en)
FR (1) FR867844A (en)
GB (1) GB535701A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2443958A (en) * 1944-09-23 1948-06-22 Rca Corp Modulation
US2545123A (en) * 1946-05-20 1951-03-13 Rca Corp Computing device
US2473691A (en) * 1947-08-05 1949-06-21 Bell Telephone Labor Inc Stabilization of cathode beam tubes

Also Published As

Publication number Publication date
US2300394A (en) 1942-11-03
FR867844A (en) 1941-11-29
BE441588A (en)

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