GB809595A - Improvements in or relating to television systems - Google Patents

Improvements in or relating to television systems

Info

Publication number
GB809595A
GB809595A GB3343554A GB3343554A GB809595A GB 809595 A GB809595 A GB 809595A GB 3343554 A GB3343554 A GB 3343554A GB 3343554 A GB3343554 A GB 3343554A GB 809595 A GB809595 A GB 809595A
Authority
GB
United Kingdom
Prior art keywords
carrier
signal
sound
main
frequency
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
GB3343554A
Inventor
Clifford Herbert Braybrook
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.)
Mullard Radio Valve Co Ltd
Original Assignee
Mullard Radio Valve Co 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 Mullard Radio Valve Co Ltd filed Critical Mullard Radio Valve Co Ltd
Priority to GB3343554A priority Critical patent/GB809595A/en
Publication of GB809595A publication Critical patent/GB809595A/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)
  • Color Television Systems (AREA)
  • Transmitters (AREA)
  • Processing Of Color Television Signals (AREA)

Abstract

809,595. Colour television. MULLARD RADIO VALVE CO. Ltd. Feb. 13, 1956 [Nov. 18, 1954], No. 33435/54. Class 40 (3). In a television system, such as a colour system, wherein the transmission consists of a main signal v, v<SP>1</SP> on a main carrier V, a pair of quadrature-modulated signals c on a sub-carrier C, and a sound signal on a carrier S, a phasereference signal for demodulating the subcarrier is derived at the receiver from the difference frequency between the sound and main carriers. With signals having frequencies according to example shown, the sound carrier S appears at 3.5 Mc. after demodulation at a frequency centred on the main carrier V and after suitable selection from the modulation components is divided by 4/3 to provide a signal of 2.625 Mc. corresponding to the frequency at which the sub-carrier appears. The frequencies indicated are approximate, since, at the transmitter, the sub-carrier is arranged to be an odd multiple of half the line frequency which in turn is locked to the mains frequency. Starting with the 2.625 Mc. signal, this is multiplied by 4/3 to obtain the 3.5 Mc. for the sound carrier, and then finally the 3.5 Mc. is mixed with a 45 Mc. signal to obtain the 41.5 Mc. sound carrier for transmission. Fig. 2 (not shown), illustrates an alternative transmission signal in which the sub-carrier is located outside the band of the main signal. Specification 741,278 is referred to. Reference has been directed by the Comptroller to Specification 776,554.
GB3343554A 1954-11-18 1954-11-18 Improvements in or relating to television systems Expired GB809595A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3343554A GB809595A (en) 1954-11-18 1954-11-18 Improvements in or relating to television systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3343554A GB809595A (en) 1954-11-18 1954-11-18 Improvements in or relating to television systems

Publications (1)

Publication Number Publication Date
GB809595A true GB809595A (en) 1959-02-25

Family

ID=10352916

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3343554A Expired GB809595A (en) 1954-11-18 1954-11-18 Improvements in or relating to television systems

Country Status (1)

Country Link
GB (1) GB809595A (en)

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