GB643694A - Improvements in or relating to television receivers - Google Patents

Improvements in or relating to television receivers

Info

Publication number
GB643694A
GB643694A GB1422448A GB1422448A GB643694A GB 643694 A GB643694 A GB 643694A GB 1422448 A GB1422448 A GB 1422448A GB 1422448 A GB1422448 A GB 1422448A GB 643694 A GB643694 A GB 643694A
Authority
GB
United Kingdom
Prior art keywords
sound
filter
fed
modulated
vision
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
GB1422448A
Inventor
Harry Grayson
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB1422448A priority Critical patent/GB643694A/en
Publication of GB643694A publication Critical patent/GB643694A/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
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/60—Receiver circuitry for the reception of television signals according to analogue transmission standards for the sound signals
    • H04N5/62—Intercarrier circuits, i.e. heterodyning sound and vision carriers

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Television Receiver Circuits (AREA)

Abstract

643,694. Diplex radio signalling. STANDARD TELEPHONES & CABLES, Ltd. May 26, 1948, No. 14224. [Class 40 (v)] In a television receiving system, the carrier wave for the vision signals is used to heterodyne the incoming sound-modulated carrier wave. The vision and sound modulated carriers are passed through an H.F. amplifier 3 and are fed to two band-pass filters 5, 6, the filter 5 passing only the vision-modulated carrier and the filter 6 passing only the sound modulated carrier. The vision modulated carrier is then fed to a detector 13 and display tube 15, and also through a filter or limiter 16 serving to remove any modulation so that a pure carrier wave is fed to a mixer 18, where it is used to heterodyne the incoming sound modulated carrier from the filter 6. The sound signal is then fed to a reproducing device 23 through a detector and A.F. amplifier 21. In the case of a frequency modulated sound carrier the band-pass filter 5 is rendered unnecessary (Fig. 2, not shown), and a discriminator is inserted between the mixer 18 and amplifier 21.
GB1422448A 1948-05-26 1948-05-26 Improvements in or relating to television receivers Expired GB643694A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1422448A GB643694A (en) 1948-05-26 1948-05-26 Improvements in or relating to television receivers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1422448A GB643694A (en) 1948-05-26 1948-05-26 Improvements in or relating to television receivers

Publications (1)

Publication Number Publication Date
GB643694A true GB643694A (en) 1950-09-27

Family

ID=10037284

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1422448A Expired GB643694A (en) 1948-05-26 1948-05-26 Improvements in or relating to television receivers

Country Status (1)

Country Link
GB (1) GB643694A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1138813B (en) * 1958-07-19 1962-10-31 Telefunken Patent TV receiver according to the differential carrier method
FR2409647A1 (en) * 1977-11-16 1979-06-15 Plessey Handel Investment Ag MEDIUM FREQUENCY CIRCUIT FOR TELEVISION RECEIVER

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1138813B (en) * 1958-07-19 1962-10-31 Telefunken Patent TV receiver according to the differential carrier method
FR2409647A1 (en) * 1977-11-16 1979-06-15 Plessey Handel Investment Ag MEDIUM FREQUENCY CIRCUIT FOR TELEVISION RECEIVER

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