US2182326A - Television receiving apparatus - Google Patents

Television receiving apparatus Download PDF

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Publication number
US2182326A
US2182326A US55493A US5549335A US2182326A US 2182326 A US2182326 A US 2182326A US 55493 A US55493 A US 55493A US 5549335 A US5549335 A US 5549335A US 2182326 A US2182326 A US 2182326A
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US
United States
Prior art keywords
cathode ray
tube
signal
receiving apparatus
potential
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 - Lifetime
Application number
US55493A
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English (en)
Inventor
Urtel Rudolf
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.)
Telefunken AG
Original Assignee
Telefunken AG
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 Telefunken AG filed Critical Telefunken AG
Application granted granted Critical
Publication of US2182326A publication Critical patent/US2182326A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
    • H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
    • H04N3/30—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical otherwise than with constant velocity or otherwise than in pattern formed by unidirectional, straight, substantially horizontal or vertical lines
    • H04N3/32—Velocity varied in dependence upon picture information

Definitions

  • the limitation set by the transmission means is of secondary importance.
  • Optical conditions intensity of light
  • Optical conditions are opposed'to a reduction of the scanning spot below the size hitherto possible. Accordingly, there is a certain amount of impracticality attached to compensation of this type of distortion at the transmitter.
  • Figure 1 represents the theoretical change in developed scanner or potential current which should occur if no distortion were present in the sharp transition between dark and bright in the image to be transmitted.
  • Figure 2 shows the actually developed current or voltage.
  • Figure 6 is an embodiment of my invention.
  • FIG. 1 there is shown the signal which theoretically should be developed at the scanner when the elemental section of the image undergoing scanning changes from black to white, or vice versa, depending on the reference to which the signal is developed.
  • an increase in developed potential represents an increase in brightness of the object
  • the value of potential should rise vertically with respect to time on the current or voltage-time curve. This varies from the actual conditions as limited by the size of the scanning openings in a Nipkow disc or the size of concentrated beam in a cathode ray tube.
  • the signal produces an additional deviation of the ray composing the image, since the normal deviation as such is carried out with constant velocity.
  • this may, for instance, be accomplished by applying the additional potential to the line deviation plates.
  • Figure 4 shows the distance-time diagram of the ray without and with additional deviation an and 3:2, respectively.
  • Figure 5 indicates the intensity course throughout the path and again without (I1) and with (I2) additional deviation. These two curves show the increase in the sharpness of the contours obtained by the additional deviation. But it a should be borne in mind that the efiective brilliancy H observed b'y'the eye is proportional to the intensity I, and proportional in the inverse sense to the recording velocity v.” The addi tional deviation however also changes the recording velocity in accordance with the second differential quotient of the intensity with respect to-time ( Figure 4, v1, v2)
  • a cathode ray tube with an embodiment of my invention.
  • the picture signals are fed to an amplifier tube In, in this case a screen grid tube.
  • a frequency responsive device in this case an inductance II and an anode potential supply l4.
  • a condenser l2 Also joined to the anode of the tube Land in parallel with elements H and I4, is a condenser l2 and a resistance l3.
  • Potential supply 9 biases the element 4a positively with respect to the cathode of the cathode ray tube.
  • the cathode ray tube l contains a cathode 2, control grid 3 and anode 4. For the purpose of simplicity only the horizontal. deflecting coils 5 have been illustrated. In addition to the horizontal deflecting coils 5, there are supplementary horizontal deflecting means 6 which are electrostatically operated. An additional anode structure 4a is joined to the condenser IZ-resistance l3 circuit, as well as deflecting plates 6.
  • the incoming video signal is impressed on the control grid of tube Ill and there appears 'g a corresponding signal of increased amplitude in the output circuit.
  • the condenser l2 will then be charged to a value dependent on the amplitude of the signal and the frequency response of the anode circuit.
  • This signal will retard the deflection of the cathode ray beam and will modulate the recording velocity of the 'beam, auxiliary deflecting means, means for deriving from the received video signal an auxiliary signal bearing a proportionality to the first derivative of the amplitude of said video signal,
  • a cathode ray tube comprising an envelope including means for generating, accelerating, and modulating a cathode ray beam, means for deflecting thebeam in at least one co-ordinate of movement, auxiliary deflectingmeans, a thermionic vacuum tube having anode, cathode and at least one control electrode, means for impressing received television signals onto the modulating electrode of said cathode ray tube and onto the control electrodecathode circuit of said thermionic tube, inductive means connected in the anode-cathode circuit of said thermionic tube, and impedance circuit connected substantially in parallel with said inductive member and subject to variations in potential across the terminals of said inductive member, and means for impressing the variations in potential across at least a portion of said impedance circuit onto said auxiliary deflecting means.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Details Of Television Scanning (AREA)
US55493A 1934-12-20 1935-12-20 Television receiving apparatus Expired - Lifetime US2182326A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2182326X 1934-12-20

Publications (1)

Publication Number Publication Date
US2182326A true US2182326A (en) 1939-12-05

Family

ID=7988921

Family Applications (1)

Application Number Title Priority Date Filing Date
US55493A Expired - Lifetime US2182326A (en) 1934-12-20 1935-12-20 Television receiving apparatus

Country Status (4)

Country Link
US (1) US2182326A (enrdf_load_stackoverflow)
AT (1) AT148660B (enrdf_load_stackoverflow)
FR (1) FR799621A (enrdf_load_stackoverflow)
NL (1) NL43338C (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2501110A (en) * 1945-01-24 1950-03-21 Us Sec War Indicating circuit
US2678964A (en) * 1950-08-14 1954-05-18 Hazeltine Research Inc Modifying the transient response of image-reproducers
US2759997A (en) * 1951-12-14 1956-08-21 Itt Generation of harmonics from high frequency components of received signal for addition to received signal
US2851522A (en) * 1951-12-13 1958-09-09 Columbia Broadcasting Syst Inc Television

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2501110A (en) * 1945-01-24 1950-03-21 Us Sec War Indicating circuit
US2678964A (en) * 1950-08-14 1954-05-18 Hazeltine Research Inc Modifying the transient response of image-reproducers
US2851522A (en) * 1951-12-13 1958-09-09 Columbia Broadcasting Syst Inc Television
US2759997A (en) * 1951-12-14 1956-08-21 Itt Generation of harmonics from high frequency components of received signal for addition to received signal

Also Published As

Publication number Publication date
NL43338C (enrdf_load_stackoverflow)
FR799621A (fr) 1936-06-16
AT148660B (de) 1937-02-25

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