GB731980A - Improvements in or relating to television receivers - Google Patents

Improvements in or relating to television receivers

Info

Publication number
GB731980A
GB731980A GB4208/53A GB420853A GB731980A GB 731980 A GB731980 A GB 731980A GB 4208/53 A GB4208/53 A GB 4208/53A GB 420853 A GB420853 A GB 420853A GB 731980 A GB731980 A GB 731980A
Authority
GB
United Kingdom
Prior art keywords
pass
switch
amplifier
filter
video
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
GB4208/53A
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
Telefunken Gesellschaft fuer Drahtlose Telegraphie mbH
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, Telefunken Gesellschaft fuer Drahtlose Telegraphie mbH filed Critical Telefunken AG
Publication of GB731980A publication Critical patent/GB731980A/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
    • H04N5/20—Circuitry for controlling amplitude response
    • H04N5/205—Circuitry for controlling amplitude response for correcting amplitude versus frequency characteristic
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/42—Modifications of amplifiers to extend the bandwidth
    • H03F1/48—Modifications of amplifiers to extend the bandwidth of aperiodic amplifiers
    • H03F1/50—Modifications of amplifiers to extend the bandwidth of aperiodic amplifiers with tubes only
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/17—Structural details of sub-circuits of frequency selective networks
    • H03H7/1741—Comprising typical LC combinations, irrespective of presence and location of additional resistors
    • H03H7/1758—Series LC in shunt or branch path

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Picture Signal Circuits (AREA)

Abstract

731,980. Valve amplifying circuits. TELEFUNKEN GES. FUR DRAHTLOSE TELEGRAPHIE. Feb. 16, 1953 [Feb. 16, 1952], No. 4208/53. Class 40 (6). [Also in Group XL (b)] The load impedance of a video amplifier in a television receiver includes a coupling circuit in the form of a low-pass filter having means for adjusting the components of the filter so as to decrease the pass range at the high-frequency end thereof and simultaneously to change the magnitude of the load impedance so as to increase the gain of the amplifier. As illustrated, output video stage 1 feeds the cathode-ray tube over condenser 2 and includes a half-section, m-derived filter the shunt and series arms of which have tappings connected through double-pole switch 17. With the switch closed so that only part of each of inductances 13 and 16 is in circuit, the video pass-band extends up to 5 Mc./sec., and when the switch is open the range is reduced to 2.5 Mc./sec. The gain of the amplifier is approximately doubled when the pass-band is reduced. When the switch is closed the damping provided by the coupling to the shortcircuited portions of the inductances may be employed wholly or in part in place of damping resistors 11 and 15.
GB4208/53A 1952-02-16 1953-02-16 Improvements in or relating to television receivers Expired GB731980A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE312002X 1952-02-16

Publications (1)

Publication Number Publication Date
GB731980A true GB731980A (en) 1955-06-15

Family

ID=6132768

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4208/53A Expired GB731980A (en) 1952-02-16 1953-02-16 Improvements in or relating to television receivers

Country Status (5)

Country Link
BE (1) BE517672A (en)
CH (1) CH312002A (en)
FR (1) FR1070852A (en)
GB (1) GB731980A (en)
NL (2) NL91437C (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1254677B (en) * 1955-02-01 1967-11-23 Loewe Opta Gmbh Device for the optional setting of different bandwidths in television receivers

Also Published As

Publication number Publication date
BE517672A (en)
FR1070852A (en) 1954-08-18
NL91437C (en)
CH312002A (en) 1955-12-15
NL176077B (en)

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