GB779457A - Improvements relating to colour television - Google Patents

Improvements relating to colour television

Info

Publication number
GB779457A
GB779457A GB2201254A GB2201254A GB779457A GB 779457 A GB779457 A GB 779457A GB 2201254 A GB2201254 A GB 2201254A GB 2201254 A GB2201254 A GB 2201254A GB 779457 A GB779457 A GB 779457A
Authority
GB
United Kingdom
Prior art keywords
signals
chrominance
luminance
colour
chrominance signals
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
GB2201254A
Inventor
William Spencer Percival
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.)
EMI Ltd
Electrical and Musical Industries Ltd
Original Assignee
EMI Ltd
Electrical and Musical Industries Ltd
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 EMI Ltd, Electrical and Musical Industries Ltd filed Critical EMI Ltd
Priority to GB2201254A priority Critical patent/GB779457A/en
Priority to FR1128297D priority patent/FR1128297A/en
Publication of GB779457A publication Critical patent/GB779457A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N11/00—Colour television systems
    • H04N11/06—Transmission systems characterised by the manner in which the individual colour picture signal components are combined
    • H04N11/12—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous signals only
    • H04N11/14—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous signals only in which one signal, modulated in phase and amplitude, conveys colour information and a second signal conveys brightness information, e.g. NTSC-system

Landscapes

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

Abstract

779,457. Colour television. ELECTRIC & MUSICAL INDUSTRIES, Ltd. July 22, 1955 [July 28, 1954], No. 22012/54. Drawings to Specification. Class 40 (3). In a colour television transmission wherein chrominance signals are transmitted within the same frequency band as luminance signals, lowfrequency chrominance signals are transmitted at reduced amplitude relative to higher frequency chrominance signals. The invention has the effect of increasing compatability by: (1) reducing audible " buzz " produced in monochrome receivers by the audio frequency components of the chrominance, signals; and (2) reducing the visibility of the dot structure occurring in the reproduced image at the difference frequency between the luminance and chrominance carriers. In one arrangement, chrominance signals in the range 50-1000 c/s. are attenuated 12 db relative to the remaining signals. In another arrangement effective to reduce the dot structure except on transients, signals in the range 0-100 kc/s. are attenuated 12db. Colour receivers for the transmission are arranged with complementary attenuation characteristics to restore the signal levels. The chrominance signals are conveyed by subcarrier or, preferably by an independent carrier generated by a separate transmitter as in Specication 754,742. When a sub-carrier is used, a colour receiver preferably employs a filter in the luminance channel to remove luminance components within Œ100 kc/s of the sub-carrier.
GB2201254A 1954-07-28 1954-07-28 Improvements relating to colour television Expired GB779457A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB2201254A GB779457A (en) 1954-07-28 1954-07-28 Improvements relating to colour television
FR1128297D FR1128297A (en) 1954-07-28 1955-07-28 Improvements in color television

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2201254A GB779457A (en) 1954-07-28 1954-07-28 Improvements relating to colour television

Publications (1)

Publication Number Publication Date
GB779457A true GB779457A (en) 1957-07-24

Family

ID=10172505

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2201254A Expired GB779457A (en) 1954-07-28 1954-07-28 Improvements relating to colour television

Country Status (2)

Country Link
FR (1) FR1128297A (en)
GB (1) GB779457A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE633733A (en) * 1962-06-18

Also Published As

Publication number Publication date
FR1128297A (en) 1957-01-03

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