HK112396A - Method for transmitting a video signal - Google Patents

Method for transmitting a video signal

Info

Publication number
HK112396A
HK112396A HK112396A HK112396A HK112396A HK 112396 A HK112396 A HK 112396A HK 112396 A HK112396 A HK 112396A HK 112396 A HK112396 A HK 112396A HK 112396 A HK112396 A HK 112396A
Authority
HK
Hong Kong
Prior art keywords
disturbances
additional data
colour
amplitude
transmitted
Prior art date
Application number
HK112396A
Inventor
Martin Plantholt
Original Assignee
Thomson Brandt Gmbh
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=25890851&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=HK112396(A) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from DE4007092A external-priority patent/DE4007092A1/en
Priority claimed from DE4021698A external-priority patent/DE4021698A1/en
Application filed by Thomson Brandt Gmbh filed Critical Thomson Brandt Gmbh
Publication of HK112396A publication Critical patent/HK112396A/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/007—Systems with supplementary picture signal insertion during a portion of the active part of a television signal, e.g. during top and bottom lines in a HDTV letter-box system
    • 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
    • H04N11/16—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 the chrominance signal alternating in phase, e.g. PAL-system
    • H04N11/167—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 the chrominance signal alternating in phase, e.g. PAL-system a resolution-increasing signal being multiplexed to the PAL-system signal, e.g. PAL-PLUS-system
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N11/00—Colour television systems
    • H04N11/24—High-definition television systems
    • H04N11/28—High-definition television systems involving bandwidth reduction, e.g. subsampling

Abstract

In the letterbox colour television system, additional data are transmitted with an appreciably reduced amplitude for reasons of compatibility, low frequency components having a relatively high amplitude. This results, however, in a reduction in the signal-to-noise ratio and disturbances in synchronization occur in known television receivers. The amplitude of the additional data can be increased without the disturbances in synchronization that occur in known television receivers if the additional data are transmitted in the form of a vestigial sideband modulation of the colour carrier. The frequency response of known IF filters can be exploited advantageously to form a Nyquist flank on the colour carrier. If the phase used is a constant V-phase of the colour carrier, any disturbances in the compatible reception are advantageously slight.
HK112396A 1990-03-07 1996-06-27 Method for transmitting a video signal HK112396A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4007092A DE4007092A1 (en) 1990-03-07 1990-03-07 TV video signal transmission system of letter-box type - modulates chrominance carrier by extra information signals using filters
DE4021698A DE4021698A1 (en) 1990-07-07 1990-07-07 Letter-box colour television system

Publications (1)

Publication Number Publication Date
HK112396A true HK112396A (en) 1996-07-05

Family

ID=25890851

Family Applications (1)

Application Number Title Priority Date Filing Date
HK112396A HK112396A (en) 1990-03-07 1996-06-27 Method for transmitting a video signal

Country Status (17)

Country Link
EP (1) EP0518946B1 (en)
JP (1) JPH05505076A (en)
KR (1) KR100212384B1 (en)
CN (1) CN1027486C (en)
AT (1) ATE131336T1 (en)
AU (1) AU642725B2 (en)
BR (1) BR9106110A (en)
DE (1) DE59107039D1 (en)
DK (1) DK0518946T3 (en)
ES (1) ES2082199T3 (en)
FI (1) FI923975A (en)
GR (1) GR3018339T3 (en)
HK (1) HK112396A (en)
HU (1) HUT63724A (en)
MY (1) MY108674A (en)
NO (1) NO179350C (en)
WO (1) WO1991014346A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69124142T2 (en) * 1990-06-06 1997-07-10 Philips Electronics Nv Extended television system with letterbox process
DE4111979A1 (en) 1991-04-12 1992-10-15 Thomson Brandt Gmbh DEVICE FOR IMAGE SIGNAL RECORDING AND / OR PLAYBACK
EP0543038A1 (en) * 1991-11-19 1993-05-26 Samsung Electronics Co., Ltd. Color-under chroma channel encoded with auxiliary signals

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3414452C1 (en) * 1984-04-17 1985-10-10 Robert Bosch Gmbh, 7000 Stuttgart Method for compatibly transmitting a colour television signal containing additional information
US4882614A (en) * 1986-07-14 1989-11-21 Matsushita Electric Industrial Co., Ltd. Multiplex signal processing apparatus
US5053859A (en) * 1987-09-02 1991-10-01 Scientific-Atlanta, Inc. High definition B-MAC television signal transmission system
DE3930964A1 (en) * 1989-09-15 1991-03-28 Thomson Brandt Gmbh TELEVISION TRANSMISSION SYSTEM

Also Published As

Publication number Publication date
DE59107039D1 (en) 1996-01-18
HUT63724A (en) 1993-09-28
CN1027486C (en) 1995-01-18
FI923975A0 (en) 1992-09-04
NO923460L (en) 1992-09-04
ATE131336T1 (en) 1995-12-15
KR100212384B1 (en) 1999-08-02
FI923975A (en) 1992-09-04
EP0518946A1 (en) 1992-12-23
DK0518946T3 (en) 1996-02-12
NO923460D0 (en) 1992-09-04
BR9106110A (en) 1993-02-24
AU642725B2 (en) 1993-10-28
MY108674A (en) 1996-10-31
AU7455491A (en) 1991-10-10
EP0518946B1 (en) 1995-12-06
CN1054696A (en) 1991-09-18
NO179350C (en) 1996-09-18
NO179350B (en) 1996-06-10
WO1991014346A1 (en) 1991-09-19
ES2082199T3 (en) 1996-03-16
JPH05505076A (en) 1993-07-29
GR3018339T3 (en) 1996-03-31

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Legal Events

Date Code Title Description
PC Patent ceased (i.e. patent has lapsed due to the failure to pay the renewal fee)