GB627099A - Improvements in methods for the modulation of an ultra-short wave transmitter - Google Patents

Improvements in methods for the modulation of an ultra-short wave transmitter

Info

Publication number
GB627099A
GB627099A GB7042/47A GB704247A GB627099A GB 627099 A GB627099 A GB 627099A GB 7042/47 A GB7042/47 A GB 7042/47A GB 704247 A GB704247 A GB 704247A GB 627099 A GB627099 A GB 627099A
Authority
GB
United Kingdom
Prior art keywords
slit
strip
film
energy
resonator
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
GB7042/47A
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.)
Thales SA
Original Assignee
CSF Compagnie Generale de Telegraphie sans Fil SA
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 CSF Compagnie Generale de Telegraphie sans Fil SA filed Critical CSF Compagnie Generale de Telegraphie sans Fil SA
Publication of GB627099A publication Critical patent/GB627099A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B9/00—Recording or reproducing using a method not covered by one of the main groups G11B3/00 - G11B7/00; Record carriers therefor
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C7/00—Modulating electromagnetic waves
    • H03C7/02—Modulating electromagnetic waves in transmission lines, waveguides, cavity resonators or radiation fields of antennas

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Abstract

627,099. Modulating-systems. COMPAGNIE GENERALE DE TELEGRAPHIE SANS FIL. March 13, 1947, No. 7042. Convention date, March 22, 1946. [Class 40 (v)] A modulation process consists of passing a a strip of film or other material in front of a slit in a cavity resonator which is fed with U.H.F. energy. The invention is especially applicable to cinema sound apparatus. In Fig. 3, a magnetron oscillator 10 feeds energy along guide 9 into a cavity resonator 4 which is terminated by two conducting sheets having slits 3 and 3<1>. The characteristic impedance of slit 3 is varied by passing a film strip 1 in front of this slit. The strip may consist of ordinary sound film, or may be specially manufactured from metallized dielectric ribbon or from a plastic material, the thickness of which is made to vary as the sound intensity by a moulding process. Energy in resonator 4 is thereby amplitude-modulated, and is supplied from. slit 31 to transmission horn 13.. The associated receiving aerial and apparatus may be located behind the cinema screen. Fig. 2 shows a suitable guide to enable the film to slide in front of slit 3. The U-shaped pieces 7 and 8 are made a quarter of a wavelength long to avoid energy leakage. An alternative arrangement (Fig. 4, not shown) is also described in which the strip is passed in front of a slit which connects the main resonator with an auxiliary cavity resonator. A modified form of slit is also described which is shaped as described in Specification 608,254, [Group XL (b)]
GB7042/47A 1946-03-22 1947-03-13 Improvements in methods for the modulation of an ultra-short wave transmitter Expired GB627099A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR925115T 1946-03-22

Publications (1)

Publication Number Publication Date
GB627099A true GB627099A (en) 1949-07-28

Family

ID=9439861

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7042/47A Expired GB627099A (en) 1946-03-22 1947-03-13 Improvements in methods for the modulation of an ultra-short wave transmitter

Country Status (3)

Country Link
US (1) US2518371A (en)
FR (1) FR925115A (en)
GB (1) GB627099A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4038602A (en) * 1976-02-25 1977-07-26 The United States Of America As Represented By The Secretary Of The Navy Automodulated realtivistic electron beam microwave source

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE309834C (en) *
US1631450A (en) * 1920-02-03 1927-06-07 Andrews Cyrus Newton Art of and means for metrical optic and acoustic recording and reproduction
US1859665A (en) * 1929-07-31 1932-05-24 Harry H Golden Method and means for combining pictures with sound
US2230855A (en) * 1939-03-15 1941-02-04 Walter C Wellman Signal reproducing means
US2301163A (en) * 1940-02-24 1942-11-03 Koch Siegfried High frequency tuned oscillatory circuit
US2412446A (en) * 1942-10-31 1946-12-10 Gen Electric Ultra high frequency system

Also Published As

Publication number Publication date
US2518371A (en) 1950-08-08
FR925115A (en) 1947-08-26

Similar Documents

Publication Publication Date Title
GB681425A (en) Improvements in and relating to tubes of the magnetron type for ultra short waves
GB663728A (en) Improvements in or relating to travelling wave amplifying waves
GB564858A (en) Electron discharge apparatus for generating electromagnetic waves
GB654668A (en) Transmission cells for ultra high frequency devices and systems
GB608262A (en) Improvements in or relating to waveguide transmission systems
GB660792A (en) Improvements in or relating to electron discharge tube arrangements for use on ultra high frequencies
US2555443A (en) Radio apparatus employing slot antenna
GB689063A (en) Travelling wave tube
GB627099A (en) Improvements in methods for the modulation of an ultra-short wave transmitter
GB655826A (en) Improvements in or relating to carrier wave modulation systems
GB635131A (en) Improvements in or relating to high frequency transmission systems embodying wave guides
GB676939A (en) Improvements of ultra short electrical wave guides particularly applicable to transmission across rotating joints
GB660362A (en) High frequency line repeaters
GB635619A (en) Improvement in coupling arrangements for electrical resonators
GB643605A (en) Improvements in and relating to high frequency dielectric heating
GB1285652A (en) Improvements in or relating to waveguide isolators
GB975680A (en) Waveguide microwave mixer
GB636611A (en) Improvements in or relating to high frequency signalling systems
GB626592A (en) Improvements relating to the transmission of television signals on ultra-short waves
GB615668A (en) Improvements in or relating to high frequency systems employing the propagation of the electromagnetic oscillation in a guide of rectangular section
GB604612A (en) Apparatus for the radiation or reception of electromagnetic waves
GB614588A (en) Improvements in or relating to wave guides and wave guide filter arrangements
GB661857A (en) Improvements in or relating to microwave testing systems, particularly for short pulse transmitters
GB565413A (en) Improvements in or relating to the frequency modulation of oscillations generated byvelocity-modulation discharge devices
JPS5372550A (en) Microwave lead-in flange