US1876109A - Device for modulating the frequency of electric oscillations - Google Patents

Device for modulating the frequency of electric oscillations Download PDF

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Publication number
US1876109A
US1876109A US408462A US40846229A US1876109A US 1876109 A US1876109 A US 1876109A US 408462 A US408462 A US 408462A US 40846229 A US40846229 A US 40846229A US 1876109 A US1876109 A US 1876109A
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United States
Prior art keywords
frequency
resistance
oscillations
modulating
condenser
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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
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US408462A
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English (en)
Inventor
Pol Balthasar Van Der
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RCA Corp
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RCA Corp
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Publication date
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Publication of US1876109A publication Critical patent/US1876109A/en
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C3/00—Angle modulation
    • H03C3/36—Angle modulation by means of light-sensitive element

Definitions

  • This invention relates to light-sensitive cells and more particularly to circuit arrangements in which these cells are used.
  • the invention has for its object to insert the light-sensitive cell or radiant responsive device in a circuit arrangement in such a manner that frequency modulation of electric According to the invention this result is attained by replacing in a circuit, in which relaxation oscillations are set up, the resistance necessary for this purpose or at least part of it with a light-sensitive cell or radiant responsive device.
  • a neon tube or glow discharge device 1 is connected in parallel to a condenser 2.
  • a source of direct current or unidirectional potential 3 and a lightsen'sitive cell 4 are connected in series with this parallel connection.
  • the frequency of the oscillations occurring at the terminals of the resistance 6, which are termed relaxation oscillations, is dependent upon the value of the condenser 2 and of the resistance of the light-sensitive cell 4. whose resistance is made to vary in accordance with signals or intelligence to be transmitted.
  • the resistance of the cell will undergo variations and the frequency of the relaxation oscillations is consequently modulated correspondingly to the said light variations.
  • a glow discharge device and a resistance in series in series, a condenser connected across the glow discharge device and the resistance, a source of potential, and a radiant responsive device connected in series with said glow discharge device and said resistance whereby variations in radiant energy falling upon said radiant responsive device causes variations in frequency of oscillations set up between the glow device and said resistance and condenser.
  • a glow discharge device for transmitting intelligence'by undulatory electrical currents whose frequency is varied in accordance with the intelligence to be transmitted, a glow discharge device, a resistance in series therewith, a condenser across said glow device and resistance, means for connecting an output circuit across said resistance, and, a source of potential and a radiant responsive device in series, connected across said condenser whereby variations in radiant energy falling upon said radiant responsive device varies the resistance thereof and consequently the frequency of oscillations set up between said glow device and condenser.

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US408462A 1928-11-30 1929-11-20 Device for modulating the frequency of electric oscillations Expired - Lifetime US1876109A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL1876109X 1928-11-30

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US1876109A true US1876109A (en) 1932-09-06

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ID=19873227

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US408462A Expired - Lifetime US1876109A (en) 1928-11-30 1929-11-20 Device for modulating the frequency of electric oscillations

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BE (1) BE365687A (enrdf_load_html_response)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2826693A (en) * 1955-02-03 1958-03-11 Arnold E Resnik Pulse generator
US2941084A (en) * 1952-01-02 1960-06-14 Fruengel Frank Receiver for light-flash signaling system
US3031577A (en) * 1957-05-09 1962-04-24 David W Garbellano Radiation detector
US3232191A (en) * 1962-08-08 1966-02-01 Eastman Kodak Co Low-scene-brightness signal for photographic cameras
US3368593A (en) * 1964-10-09 1968-02-13 Industrial Nucleonics Corp Originating filler identification system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2941084A (en) * 1952-01-02 1960-06-14 Fruengel Frank Receiver for light-flash signaling system
US2826693A (en) * 1955-02-03 1958-03-11 Arnold E Resnik Pulse generator
US3031577A (en) * 1957-05-09 1962-04-24 David W Garbellano Radiation detector
US3232191A (en) * 1962-08-08 1966-02-01 Eastman Kodak Co Low-scene-brightness signal for photographic cameras
US3368593A (en) * 1964-10-09 1968-02-13 Industrial Nucleonics Corp Originating filler identification system

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BE365687A (enrdf_load_html_response)

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