GB505899A - Improvements in or relating to coupling means for thermionic valve circuits - Google Patents

Improvements in or relating to coupling means for thermionic valve circuits

Info

Publication number
GB505899A
GB505899A GB3121337A GB3121337A GB505899A GB 505899 A GB505899 A GB 505899A GB 3121337 A GB3121337 A GB 3121337A GB 3121337 A GB3121337 A GB 3121337A GB 505899 A GB505899 A GB 505899A
Authority
GB
United Kingdom
Prior art keywords
resistance
coupling
condenser
ray tube
shows
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
GB3121337A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB3121337A priority Critical patent/GB505899A/en
Priority to DEE51843D priority patent/DE756555C/en
Publication of GB505899A publication Critical patent/GB505899A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/148—Video amplifiers

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Picture Signal Circuits (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)

Abstract

505,899. Valve amplifying circuits; television receivers. FAUDELL, C. L., and ATKINSON, N. Nov. 13, 1937, No. 31213. [Classes 40 (iii) and 40 (v)] In a television receiver the channel which feeds the received signals to a cathode ray tube includes a network which transmits both the A.C. and D.C. components of the signal, but attenuates the D.C. relative to the A.C. components. Fig. 2 (Prov.) shows a television receiver or monitor in which the diede output is applied to an amplifier 8. The decoupling resistance 23 in the anode circuit forms with the load resistance 13 the coupling for direct current to the grid 20 of the cathode ray tube so that if the reactances of the coupling and decoupling condensers 15, 24 are negligible for A.C. the ratio of DC to AC is equal to(R23+R13/R13)(R17/R17+R16). At high frequencies the response is determined by the time constants of the combinations 13, 24 and 15, 17 and for lower frequencies by the combinations 23, 24 and 15, 16. The time constants of 23, 24 and 15, 16 are preferably different from each other. With a leaky grid detector the D.C. component of the signal may be re-inserted as described in Specification 422,906 by making the time constant of the combination long compared with the interval between synchronizing pulses. Fig. 3 (Prov.) shows an anode bend detector with the synchronizing pulses taken from the condenser 43 the output from which is applied to the cathode of the cathode ray tube. With this arrangement the D.C. component is taken through resistance 45 which .may be connected to the junction of resistances 39, 40 or between the damping resistance 38 and resistance 39. Fig. 1 (Comp.) shows an arrangement in which a cathode follower 67 is interposed in the coupling for A.C. signals. D.C. signals also may be applied to the valve 67 in which case resistance 64 is connected across condenser 66 and the coupling condenser 71 is dispensed with. Specifications 422,824, 448,421, 456,450, and 484,218 also are referred to.
GB3121337A 1937-11-13 1937-11-13 Improvements in or relating to coupling means for thermionic valve circuits Expired GB505899A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB3121337A GB505899A (en) 1937-11-13 1937-11-13 Improvements in or relating to coupling means for thermionic valve circuits
DEE51843D DE756555C (en) 1937-11-13 1938-11-15 Coupling circuit between signal source and load circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3121337A GB505899A (en) 1937-11-13 1937-11-13 Improvements in or relating to coupling means for thermionic valve circuits

Publications (1)

Publication Number Publication Date
GB505899A true GB505899A (en) 1939-05-15

Family

ID=10319707

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3121337A Expired GB505899A (en) 1937-11-13 1937-11-13 Improvements in or relating to coupling means for thermionic valve circuits

Country Status (2)

Country Link
DE (1) DE756555C (en)
GB (1) GB505899A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2505367A (en) * 1948-05-21 1950-04-25 Rca Corp Television receiver brightness and contrast control
US2522967A (en) * 1948-05-21 1950-09-19 Rca Corp Video amplifier feeding constant black level output to cathoderay tube
US2547648A (en) * 1946-01-25 1951-04-03 Hazeltine Corp Automatic contrast control system for television apparatus
US2572179A (en) * 1949-05-24 1951-10-23 Philco Corp Peak leveling circuit
US2577868A (en) * 1950-05-04 1951-12-11 Avco Mfg Corp Video amplifier coupling network for television receivers
US2656413A (en) * 1947-07-31 1953-10-20 Emi Ltd Television receiver
US2672505A (en) * 1950-06-13 1954-03-16 Avco Mfg Corp Black level shift compensating amplifier
US2708687A (en) * 1949-05-10 1955-05-17 Motorola Inc Combined direct current reinserter and synchronizing pulse separator
US2718551A (en) * 1950-03-28 1955-09-20 Zenith Radio Corp Frequency-compensated video amplifier output circuit with constant synchronizing signal output

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT150570B (en) * 1935-08-27 1937-09-10 Telefunken Gmbh TV receiver with a Braunschweig tube.

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2547648A (en) * 1946-01-25 1951-04-03 Hazeltine Corp Automatic contrast control system for television apparatus
US2656413A (en) * 1947-07-31 1953-10-20 Emi Ltd Television receiver
US2505367A (en) * 1948-05-21 1950-04-25 Rca Corp Television receiver brightness and contrast control
US2522967A (en) * 1948-05-21 1950-09-19 Rca Corp Video amplifier feeding constant black level output to cathoderay tube
US2708687A (en) * 1949-05-10 1955-05-17 Motorola Inc Combined direct current reinserter and synchronizing pulse separator
US2572179A (en) * 1949-05-24 1951-10-23 Philco Corp Peak leveling circuit
US2718551A (en) * 1950-03-28 1955-09-20 Zenith Radio Corp Frequency-compensated video amplifier output circuit with constant synchronizing signal output
US2577868A (en) * 1950-05-04 1951-12-11 Avco Mfg Corp Video amplifier coupling network for television receivers
US2672505A (en) * 1950-06-13 1954-03-16 Avco Mfg Corp Black level shift compensating amplifier

Also Published As

Publication number Publication date
DE756555C (en) 1952-02-28

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