GB1078498A - Creation of Inventions and Patents with Artificial Intelligence

GB1078498A – Improvements in and relating to receivers for receiving a colour television signal including a frequency-modulated subcarrier
– Google Patents

GB1078498A – Improvements in and relating to receivers for receiving a colour television signal including a frequency-modulated subcarrier
– Google Patents
Improvements in and relating to receivers for receiving a colour television signal including a frequency-modulated subcarrier

Info

Publication number
GB1078498A

GB1078498A
GB29299/65A
GB2929965A
GB1078498A
GB 1078498 A
GB1078498 A
GB 1078498A
GB 29299/65 A
GB29299/65 A
GB 29299/65A
GB 2929965 A
GB2929965 A
GB 2929965A
GB 1078498 A
GB1078498 A
GB 1078498A
Authority
GB
United Kingdom
Prior art keywords
frequency
subcarrier
trap
luminance signal
cathode
Prior art date
1964-07-15
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
GB29299/65A
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.)

CFT COMP FSE TELEVISION

Compagnie Francaise de Television SA

Original Assignee
CFT COMP FSE TELEVISION
Compagnie Francaise de Television SA
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.)
1964-07-15
Filing date
1965-07-09
Publication date
1967-08-09

1965-07-09
Application filed by CFT COMP FSE TELEVISION, Compagnie Francaise de Television SA
filed
Critical
CFT COMP FSE TELEVISION

1967-08-09
Publication of GB1078498A
publication
Critical
patent/GB1078498A/en

Status
Expired
legal-status
Critical
Current

Links

Espacenet

Global Dossier

Discuss

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

H04N11/18—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous and sequential signals, e.g. SECAM-system

H04N11/186—Decoding means therefor

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

H04N11/18—Transmission systems characterised by the manner in which the individual colour picture signal components are combined using simultaneous and sequential signals, e.g. SECAM-system

Abstract

1,078,498. Colour television. COMPAGNIE FRANCAISE DE TELEVISION. July 9, 1965 [July 15, 1964], No. 29299/65. Heading H4F. The invention relates to a receiver capable of receiving a colour television composite video signal including a luminance signal and a subcarrier which is frequency-modulated by a colour information and superimposed on the luminance signal in a portion of the bandwidth thereof, e.g. a “SECAM” (Trade Mark) system, the frequency modulated subcarrier having been, at the transmitting end, before its addition to the luminance signal, passed through a coding filter whose amplitude-frequency characteristic in the frequency bandwidth of the subcarrier channel increases on both sides of a predetermined frequency Fo, i.e. the subcarrier frequency. Accordingly the receiver comprises in the luminance channel a trap whose amplitude frequency characteristic shows a relative maximum for frequency Fo, and two minima for two frequencies Fo-f and Fo+f located on both sides of frequency Fo, Fig. 2 (not shown), the trap attenuating each of the two frequencies Fo-f and Fo+f relatively to frequency Fo substantially in the same ratio as it was enhanced by the coding filter relatively to frequency Fo, Fig. 1, not shown. This trap thus sufficiently eliminates the parasitic signal which the subcarrier builds up for the luminance signal without undesirable deterioration of the luminance signal. Further in the SECAM system in order to improve the transmission of the signals, the colour information video frequency signals are passed through a preemphasis filter which enhances the higher frequency components relatively to the lower frequency components before they frequency modulate the subcarrier. The frequencies Fo-f and Fo+f referred to above are the instantaneous frequencies of the subcarrier corresponding to the transmission of the maximum negative and positive levels which appear at the output of the pre-emphasis filter. As shown, Fig. 3, the trap comprises a triode 3 mounted in a cathode-follower circuit with its input 1 on the grid and its output coupled to the cathode. The anode load of the cathode follower comprises a primary parallel resonant circuit 4, 5, tuned to the frequency Fo, inductively coupled to a damped secondary resonant circuit 6, 7 also tuned to the frequency Fo. For a certain degree of coupling the impedance of circuit 4, 5 loaded by circuit 6, 7 divides into two maxima located on either side of Fo and separated by a relative minimum for Fo, the frequency interval between these two maxima growing with the degree of coupling. The efficiency of the trap may be improved by connecting the anode of tube 3 to the cathode through a capacitor 8 and a resistor 9 connected as shown. Although the cathode resistor could be a single resistor it is shown as a potentiometer resistor 10 with the amplifier output connected to a slider 11, in which case resistance 10 may also act as the resistance of the gain control potentiometer allowing for adjustment of the gain of the luminance channel. Black and white receivers adapted to receive colour video signals and to provide a black-and-white picture by means of the luminance signal may also be provided with a trap.

GB29299/65A
1964-07-15
1965-07-09
Improvements in and relating to receivers for receiving a colour television signal including a frequency-modulated subcarrier

Expired

GB1078498A
(en)

Applications Claiming Priority (1)

Application Number
Priority Date
Filing Date
Title

FR981693A

FR1418871A
(en)

1964-07-15
1964-07-15

Receiver enhancements for color television systems using a frequency modulated subcarrier

Publications (1)

Publication Number
Publication Date

GB1078498A
true

GB1078498A
(en)

1967-08-09

Family
ID=8834547
Family Applications (1)

Application Number
Title
Priority Date
Filing Date

GB29299/65A
Expired

GB1078498A
(en)

1964-07-15
1965-07-09
Improvements in and relating to receivers for receiving a colour television signal including a frequency-modulated subcarrier

Country Status (8)

Country
Link

US
(1)

US3344230A
(en)

BE
(1)

BE666593A
(en)

CH
(1)

CH422868A
(en)

CS
(1)

CS166680B2
(en)

DE
(1)

DE1291772B
(en)

FR
(1)

FR1418871A
(en)

GB
(1)

GB1078498A
(en)

NL
(1)

NL153752B
(en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

DE3836974A1
(en)

1988-10-31
1990-05-03
Peter J Biesinger

METHOD AND DEVICE FOR FOLDING AND LAYING TEXTILE FILMS IN STACKS

Family Cites Families (4)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

NL200685A
(en)

1955-09-22

US3069679A
(en)

1959-04-22
1962-12-18
Westinghouse Electric Corp
Multiplex communication systems

AT230450B
(en)

1960-10-28
1963-12-10
Cie Francaise De Television Sa

Device for the transmission of information by means of a frequency-modulated wave

BE633750A
(en)

1962-06-18

US
US3344230D
patent/US3344230A/en
not_active
Expired – Lifetime

1964

1964-07-15
FR
FR981693A
patent/FR1418871A/en
not_active
Expired

1965

1965-07-08
BE
BE666593A
patent/BE666593A/xx
unknown

1965-07-09
GB
GB29299/65A
patent/GB1078498A/en
not_active
Expired

1965-07-09
CS
CS4407A
patent/CS166680B2/cs
unknown

1965-07-14
DE
DEC36382A
patent/DE1291772B/en
active
Pending

1965-07-14
NL
NL656509078A
patent/NL153752B/en
not_active
IP Right Cessation

1965-07-14
CH
CH985265A
patent/CH422868A/en
unknown

Also Published As

Publication number
Publication date

US3344230A
(en)

1967-09-26

NL153752B
(en)

1977-06-15

CS166680B2
(en)

1976-03-29

CH422868A
(en)

1966-10-31

NL6509078A
(en)

1966-01-17

BE666593A
(en)

1965-11-03

FR1418871A
(en)

1965-11-26

DE1291772B
(en)

1969-04-03

Contact information