US2226108A - Television receiving connection - Google Patents

Television receiving connection Download PDF

Info

Publication number
US2226108A
US2226108A US50739A US5073935A US2226108A US 2226108 A US2226108 A US 2226108A US 50739 A US50739 A US 50739A US 5073935 A US5073935 A US 5073935A US 2226108 A US2226108 A US 2226108A
Authority
US
United States
Prior art keywords
signals
tube
cathode
detector
synchronisation
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
US50739A
Other languages
English (en)
Inventor
Schlesinger Kurt
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.)
LOEWE RADIO Inc
Original Assignee
LOEWE RADIO Inc
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 LOEWE RADIO Inc filed Critical LOEWE RADIO Inc
Application granted granted Critical
Publication of US2226108A publication Critical patent/US2226108A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/08—Separation of synchronising signals from picture signals

Definitions

  • the invention relates to television receiver viding line, which may be adjusted to any fixed circuits, more particularly to filter arrangements value by the battery H. This dividing line in to separate the synchronising impulses from the the case of a powerful signal should be image urr nt, situated in Fig. la at the level designated I3a,
  • the invention relates to television receivers and in the case of a weak signal (Fig. 1b) its 5 for co-operation with a television transmitter in height should be to smaller extent above the which the carrier wave of the transmitter is rezero line, and it is designated 1%.
  • filter 8 in accordance with the received signal 10 In the drawing Figs. la and 1 b show a diastrength is possible by means which are known 10 gram of the intensities in the image circuit of per se, but such a method represents a consida television receiver. erable difiiculty and is accompanied by the dan- Fig.
  • FIG. 2 shows an amplitude filter circuit conger of failure, as it may readily occur that an nected to the ultra-short wave audion stage by automatically regulated bias of this kind is too a coupling condenser. small and in consequence allows also image sig- 15
  • Fig. 3 there is provided instead of the counals to pass through the glow discharge tube 8, pling condenser a D. C. coupling. in the same manner as it may also readily be If a transmission of this nature is picked up the case that the bias is too high and accordby a receiver which can accommodate all fingerngly does not allow any signals at all to reach if condenser couplings are not provided in the kind is to be avoided, i.
  • the invention relates to methods necessary for this purpose are well the amplitude filter, which has the known funcknown in the radio art as fading compensation tion of separating the synchronisation peaks 1 methods. In this case they would preferably from the image current 2.
  • Difficulties occur in consist in the fact that the amplitude of the seppractice due to variation in the sensitivity of the arated synchronisation'signals is utilised or the receiver or variation in the strength of the re- D.
  • C. mean value thereof as regulating potenceived signal due to fading.
  • Fig. 2 illustrates tials. This method, however, is also very arthe reason for these diflioulties and shows the tificial and not sufficiently reliable.
  • the invention consists of a method differing plifier, viz., a twice grid detector whose grids are from those referred to, and is based on the idea coupled with the intermediate-frequency transthat a direct coupling is introduced between the former 3 and whose anode resistance is directly amplitude filter B and the connecting resistcoupied to the grid electrode of the Braun tube ance 4.
  • an amplitude filter for example a glow Fig. 3 serves for explanation. It again shows discharge tube 8, is coupled with the lead 5 the anode circuit 4 of the final detector l5, which through a condenser 1, it is possible to impart is directly coupled with the grid lead 5 of the to the cathode 9 of this tube through the leaktelevision tube 6.
  • age resistance ill a positive bias of such amount the cathode 9 of the filter tube 8 is connected that a correct separation of the synchronisation with this lead 5 directly, 1. e., not through the signals is effected for a certain definite received medium of condensers, while from a potentiomstrength of signal so that the glow discharge eter [4, which is connected in parallel to the tube 8 in the anode circuit passes to the transanode potential source 2'! of the detector l5, former I2 the synchronisation signals and noththere is conducted to the anode of the tube 8 ing more.
  • This bias ll should be via the output transformer or transformers [2, I2 varied continuously in accordance with the varia bias of such extent that a stream of elecation in the strength of the signals, and the trons is able to flow through the tube 8 only use of a condenser 1 means that the glow diswhen the carrier wave completely ceases, i. e., charge tube is excited by alternating potentials, upon maximum current value of the detector which rise and fall in proportion to the strength and in a very small potential range above the of the received signals.
  • An amplitude filter of value zero of the carrier As well known, the this nature marks in effect in Figs. 1a, 1b a didetector as shown has the property of providing a maximum current when the reception ceases.
  • the additional advantage of the new method consists in the fact that the position of the zero line at which the reception disappears is completely independent of the adjustment of any amplifying tubes of the receiver, and is only dependent on the biases of the final rectifier, with which the filter tube is directly coupled.
  • the potentiometer I4 is made to be operable from the outside of the apparatus, in order to be able to adjust the strength of the synchronisation signal once and for all to the optimum amount which acts reliably on the relaxation apparatus but does not overload the same.
  • a television receiving system wherein picture and synchronizing signals are received as a modulation of a common carrier and wherein the carrier amplitude reaches a substantially fixed predetermined level for the synchronizing signals
  • a detector having a cathode, a control electrode and an output electrode
  • means for applying the picture and synchronizing signals to be detected between the control electrode and the cathode of said detector means includ ing an impedance for maintaining the detector output electrode positive with respect to the cathode, a synchronizing signal separator tube including a cathode and an output electrode, means for directly connecting the cathode of the separator tube to the output electrode of the detector tube, and means for normally maintaining the output electrode of the separator tube negative with respect to its associated cathode by a voltage difference of such magnitude that current will be passed by the separator tube only during the intervals that synchronizing signals are received whereby all synchronizing signals in excess of a substantially constant predetermined amplitude are separated from the picture signals irrespective of the strength of the picture signals
  • a television receiving system wherein picture and synchronizing signals are received as a modulation of a common carrier and wherein the carrier amplitude reaches a substantially fixed predetermined level for the synchronizing signals and wherein said synchronizing signals are of a predetermined duration following each train of picture signals for each scanned line and of a different predetermined duration following successive trains of picture and line synchronizing signals to represent each scanned picture field
  • a detector having a cathode, a control electrode and an output electrode
  • means for applying the picture and synchronizing signals to be detected between the control electrode and the cathode of said detector means including an impedance for maintaining the detector output electrode positive with respect to the cathode, a synchronizing signal separator tube including a cathode and an output electrode, means for directly connecting the cathode of the separator tube to the output electrode of the detector tube, and means for normally maintaining the output electrode of the separator tube negative with respect to its associated cathode by a voltage difference of such magnitude that current will be passed by the

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Television Systems (AREA)
US50739A 1934-11-22 1935-11-20 Television receiving connection Expired - Lifetime US2226108A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE463001X 1934-11-22

Publications (1)

Publication Number Publication Date
US2226108A true US2226108A (en) 1940-12-24

Family

ID=6540050

Family Applications (1)

Application Number Title Priority Date Filing Date
US50739A Expired - Lifetime US2226108A (en) 1934-11-22 1935-11-20 Television receiving connection

Country Status (4)

Country Link
US (1) US2226108A (enrdf_load_stackoverflow)
BE (1) BE412387A (enrdf_load_stackoverflow)
FR (1) FR798065A (enrdf_load_stackoverflow)
GB (1) GB463001A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2499181A (en) * 1947-02-28 1950-02-28 Gen Electric Pulsed light film projection for television transmissions

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE754957C (de) * 1936-06-19 1954-06-21 Lorenz C Ag Schaltungsanordnung zur Abtrennung der Synchronisierungszeichen von den Bildzeichen bei Fernsehempfaengern
DE742435C (de) * 1938-12-25 1943-12-03 Fernseh Gmbh Anordnung zur Trennung der Zeilen- und Bildwechselimpulse gleicher Amplitude, aber unterschiedlicher Dauer und Frequenz, beim Fernsehen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2499181A (en) * 1947-02-28 1950-02-28 Gen Electric Pulsed light film projection for television transmissions

Also Published As

Publication number Publication date
FR798065A (fr) 1936-05-08
GB463001A (en) 1937-03-19
BE412387A (enrdf_load_stackoverflow) 1935-12-31

Similar Documents

Publication Publication Date Title
US2255484A (en) Automatic background control for television systems
US2227056A (en) Background reinserter
US2240281A (en) Automatic background control
US2197900A (en) Fading regulation in television receivers
US2247324A (en) Noise-limiting circuits for carrier wave communication systems
US2158261A (en) Television receiver operating level control
US2226108A (en) Television receiving connection
US2227001A (en) Regulation of television receivers
US2240490A (en) Television synchronizing and control system
US2265780A (en) Television receiving arrangement
US2223982A (en) Radio system
GB441761A (en) Improvements in or relating to the method and means for the synchronisation of television receivers by the transmitter
US2211860A (en) Electrical wave segregation circuit
US2137123A (en) Television system
GB505899A (en) Improvements in or relating to coupling means for thermionic valve circuits
US2240593A (en) Television synchronizing and control system
US2246947A (en) Automatic gain control
US2175335A (en) Television synchronizing circuits
US2254204A (en) Television system
US2363800A (en) Television system
US2282992A (en) Television receiver
US2810783A (en) Combined automatic gain control and synchronizing signal separation circuits
US2227492A (en) Television receiving apparatus
US2179277A (en) Modulated carrier wave receiving system
US2283404A (en) Gain controlled telegraph receiver