Television – Basic receiver with additional function – Multimode
Patent
1992-11-09
1994-07-12
Groody, James J.
Television
Basic receiver with additional function
Multimode
348578, 348568, 348704, H04N 5262, H04N 974, H04N 3223
Patent
active
053293690
DESCRIPTION:
BRIEF SUMMARY
The invention relates to the field of televisions, and in particular, to televisions having a wide display format ratio screen. Most televisions today have a format display ratio, horizontal width to vertical height, of 4:3. A wide format display ratio corresponds more closely to the display format ratio of movies, for example 16:9. The invention is applicable to both direct view televisions and projection televisions.
Televisions having a format display ratio of 4:3, often referred to as 4.times.3, are limited in the ways that single and multiple video signal sources can be displayed. Television signal transmissions of commercial broadcasters, except for experimental material, are broadcast with a 4.times.3 format display ratio. Many viewers find the 4.times.3 display format less pleasing than the wider format display ratio associated with the movies. Televisions with a wide format display ratio provide not only a more pleasing display, but are capable of displaying wide display format signal sources in a corresponding wide display format. Movies "look" like movies, not cropped or distorted versions thereof. The video source need not be cropped, either when converted from film to video, for example with a telecine device, or by processors in the television.
Televisions with a wide display format ratio are also suited to a wide variety of displays for both conventional and wide display format signals, as well as combinations thereof in multiple picture displays. However, the use of a wide display ratio screen entails numerous problems. Changing the display format ratios of multiple signal sources, developing consistent timing signals from asynchronous but simultaneously displayed sources, switching between multiple sources to generate multiple picture displays, and providing high resolution pictures from compressed data signals are general categories of such problems. Such problems are solved in a wide screen television according to this invention. A wide screen television according to various inventive arrangements is capable of providing high resolution, single and multiple picture displays, from single and multiple sources having similar or different format ratios, and with selectable display format ratios.
Television with a wide display format ratio can be implemented in television systems displaying video signals both at basic or standard horizontal scanning rates and multiples thereof, as well as by both interlaced and noninterlaced scanning. Standard NTSC video signals, for example, are displayed by interlacing the successive fields of each video frame, each field being generated by a raster scanning operation at a basic or standard horizontal scanning rate of approximately 15,734 Hz. The basic scanning rate for video signals is variously referred to as f.sub.H, 1 f.sub.h, and 1 H. The actual frequency of a 1 f.sub.H signal will vary according to different video standards. In accordance with efforts to improve the picture quality of television apparatus, systems have been developed for displaying video signals progressively, in a noninterlaced fashion. Progressive scanning requires that each displayed frame must be scanned in the same time period allotted for scanning one of the two fields of the interlaced format. Flicker free AA-BB displays require that each field be scanned twice, consecutively. In each case, the horizontal scanning frequency must be twice that of the standard horizontal frequency. The scanning rate for such progressively scanned or flicker free displays is variously referred to as 2 f.sub.H and 2 H. A 2 f.sub.H scanning frequency according to standards in the United States, for example, is approximately 31,468 Hz.
Television apparatus with conventional format display ratios can be equipped for displaying multiple pictures, for example from two video sources. The video sources may be the tuner in the television, a tuner in a video cassette recorder, a video camera, and others. In a mode often referred to as picture-in-picture (PIP), the tuner in the television provides a picture
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patent: 5065243 (1991-11-01), Katagiri
patent: 5130800 (1992-07-01), Johnson
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Canfield Barth A.
Willis Donald H.
Fried Harvey D.
Groody James J.
Hsia Sherrie
Laks Joseph J.
Thomson Consumer Electronics Inc.
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