GB252798A - Improvements relating to the radio transmission and reception of pictures - Google Patents
Improvements relating to the radio transmission and reception of picturesInfo
- Publication number
- GB252798A GB252798A GB619125A GB619125A GB252798A GB 252798 A GB252798 A GB 252798A GB 619125 A GB619125 A GB 619125A GB 619125 A GB619125 A GB 619125A GB 252798 A GB252798 A GB 252798A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- picture
- cathode
- variations
- frequency
- 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
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/00095—Systems or arrangements for the transmission of the picture signal
- H04N1/00103—Systems or arrangements for the transmission of the picture signal specially adapted for radio transmission, e.g. via satellites
Landscapes
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Selective Calling Equipment (AREA)
Abstract
252,798. Wright, G. M., and Smith, S. B. March 6, 1925. Copying-telegraphs.-Pictures &c. are transmitted wirelessly by progressively varying the frequency of a transmitted wave in accordance with variations in the light and shade values of elemental areas of the picture. Fig. 1 shows a transmitting arrangement. Light from successive areas of the picture is incident on a photoelectric cell P in circuit with an amplifier A, and the amplified current is applied between the grid and cathode of a frequency modulator valve F. The anode circuit of this valve is coupled at K to part of the oscillatory circuit of a master oscillators M, and potential variations between the grid and cathode of the valve F thus produce corresponding frequency variations in the oscillator M. Such variations are magnified in a transmitter T and radiated as a wave of varying frequency. Fig. 2 shows a receiving arrangement. The receiving aerial N is coupled to an amplifier A' adapted to limit the high frequency currents to the minimum intensity occurring during a fading period so that the output current has substantially the same amplitude for all frequencies. This current is applied through a transformer between the grid and cathode of a valve D of which the anode circuit includes an inductance L of low resistance and of an impedance which is small in relation to the anode-cathode impedance of the valve. The potential. differences across this inductance, which are substantially proportional to the incoming frequencies, are applied to a rectifying valve R, and the output current, after removal of high frequency components by a filter S, is applied to the reproduction of the picture, e.g. by supplying it to a very fine metal filament of a gas-filled lamp acting on a sensitized surface moving synchronously with the picture at the transmitting station.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEM93007D DE470384C (en) | 1925-03-06 | Device for wireless image transmission | |
GB619125A GB252798A (en) | 1925-03-06 | 1925-03-06 | Improvements relating to the radio transmission and reception of pictures |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB619125A GB252798A (en) | 1925-03-06 | 1925-03-06 | Improvements relating to the radio transmission and reception of pictures |
Publications (1)
Publication Number | Publication Date |
---|---|
GB252798A true GB252798A (en) | 1926-06-07 |
Family
ID=9810074
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB619125A Expired GB252798A (en) | 1925-03-06 | 1925-03-06 | Improvements relating to the radio transmission and reception of pictures |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB252798A (en) |
-
1925
- 1925-03-06 GB GB619125A patent/GB252798A/en not_active Expired
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