Video display system for wide and standard aspect ratio video signals

Claim 2

A video display system comprising: a signal source (704,706,710) in use for providing at least sometimes a video signal representative of an image having a given aspect ratio (e.g. 4:3); display means (730) for producing a raster having an aspect ratio (e.g. 5:3) greater than said given ratio: signal processing means (Figs 10,11) responsive to said video signal for supplying to said display means, for generating a display of said image, a processed video output signal having line periods each including a line synchronizing interval and an active video interval, characterized in that for displaying said image without change of width of said raster, the signal processing means includes means (402', D2, 1102) for creating in each line period also a delay interval ("PAUSE") which determines the position of the displayed image within the width of the raster.

Claim 3

A video display system comprising: a signal source (704,706,710) in use providing at times a first video signal representative of an image having a given aspect ratio (e.g. 4:3) and at other times a second video signal representative of an image having a greater aspect ratio (e.g. 5:3); display means (730) for producing a raster having said greater aspect ratio; dual mode signal processing means (Figs 10,11) responsive in one operating mode to said first video signal for supplying to said display means, for generating a display of said given aspect ratio image a first processed video output signal, and in a second operating mode to said second video signal for supplying to said display means, for generating a display of greater aspect ratio, a second processed video output-signal, each of said video'output signals having line periods each including a line synchronizing interval and an active interval; characterized in that, for displaying said 'image of given aspect ratio without change of width of said raster, the signal processing means includes means (402 ' , D2,l102) for creating in each line period of said first video output signal also a delay interval ("PAUSE") which determines the position of the displayed image of said given aspect ratio within the width of said raster of greater aspect ratio.

Claim 4

A video display system comprising: a signal source (704,706,710) in use providing at times a first video signal representative of an image having a given aspect ratio (e.g. 4:3) and at other times a second video signal representative of an image having a greater aspect ratio (e.g. 5:3); display means (730) for producing a raster having said greater aspect ratio; dual mode signal processing means (Figs 10,11) responsive in one operating mode to said first video signal for supplying to said display means, for generating a display of said given aspect ratio image a first processed video output signal, and in a second operating mode to said second video signal for supplying to said display means, for generating a display of greater aspect ratio, a second processed video output-signal, each of said video'output signals having line periods each including a line synchronizing interval and an active interval; characterized in that, for displaying said 'image of given aspect ratio without change of width of said raster, the signal processing means includes means (402 ' , D2,l102) for creating in each line period of said first video output signal also a delay interval ("PAUSE") which determines the position of the displayed image of said given aspect ratio within the width of said raster of greater aspect ratio.

Claim 5

A system as claimed in Claim 1 or 2 further comprising: first circuit means (402') in said processing means for producing a control signal (D3) in a predetermined time interval coincident with at least a portion of said delay interval; and second circuit means (1102) for applying said control signal to said display means (730) for inhibiting the display of image information in response to the video input signal during said predetermined time interval.

Claim 6

A system as claimed in Claim 3 wherein said control signal comprises a blanking signal.

Claim 7

A system as claimed in Claim 3 wherein said control signal (D3) is further coincident with a portion of said active video interval for inhibiting display of an edge portion of said processed video output signal.

Claim 9

A video display system as claimed in Claim 2 wherein: said video signal representative of said greater aspect image is of compressed form; and said processing means includes means for de-compressing said video input signal in said second oeprating mode; and interpolator means (1006) for interpolating at least a portion of each displayed line of said second processed video output signal.

Claim 10

A video display system as claimed in Claim 2 further comprising: circuit means in said processing means responsive in said second operation mode for applying interpolation to said second processed video output signal and responsive in said first operating mode for supplying a blanking signal to said display means.

Claim 11

A video display system as claimed in Claim 2, 7 or 8 wherein said processing means includes memory means (402') having first and second bit patterns stored therein and means (1102) for selecting said first bit pattern in said first operating mode for processing said first video output signal and for selecting said second bit pattern in said second operating mode for processing said second video output signal.

Claim 12

A video display system as claimed in Claim 9 wherein said first bit patter controls said delay interval of said first processed video output signal.