Patent US5386236A successfully refreshed from Google Patents.
US5386236A
Expired / Lapsed
US
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Television screen aspect ratio converting method and the device thereof
Assignee: LG Electronics Inc
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Filing: 1992-12-28
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Granted: 1995-01-31
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Expires: 2012-12-28
Abstract
Abstract A television screen aspect ratio converting method and the device thereof which is suitable to display a video signal having a 4:3 screen aspect ratio on a screen having a 16:9 aspect ratio. According to the present invention, scanning lines amounting to 30 lines or less having unimportant information are removed in a vertical direction from an input video signal having a 4:3 screen aspect ratio, vertical interpolation is performed for the removed scanning lines, and then 4/5 time-compression in a horizontal direction is performed, so that the video signal is displayed on a screen having a 16:9 aspect ratio. Accordingly, picture loss in a vertical direction is minimized and the screen expansion in a horizontal direction is within a range such that a general televiewer cannot perceive a variation of image, so that integrity of image to be displayed after the conversion of screen aspect ratio can be maintained as is.
Inventors
- 👤 Sung H. Hong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:09
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/01; H04N7/0117; H04N7/0122; Y; Y10; Y10S; Y10S348/00; Y10S348/913
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
198 words
A television screen aspect ratio converting device comprising: window means for receiving horizontal and vertical synchronizing signals separated from an input video signal, extracting a predetermined number of active lines to be displayed on a screen having an aspect ratio of 16:9 from a vertically interpolated signal, and outputting a control signal for positioning an image having a screen aspect ratio of 5:3 in the middle of a screen having an aspect ratio of 16:9; vertical interpolation means for vertically interpolating an input video signal having a screen aspect ratio of 4:3 by a predetermined ratio; and buffer means for time-compressing by a predetermined rate the video signal vertically interpolated by said vertical interpolation means and then outputting said interpolated video signal according to said control signal of said window means; wherein said vertical interpolation means comprises: a plurality of ROMs where a plurality of filter coefficients used in vertical interpolation are recorded; a plurality of line memories for delaying by one line said input video signals; and a plurality of adders for adding multiplied outputs of said filter coefficients of said ROMs and said delayed signals, respectively, and outputting at the same time the respective added outputs.
Claim 2
Dependent Claim
198 words
A television screen aspect ratio converting device comprising: window means for receiving horizontal and vertical synchronizing signals separated from an input video signal, extracting a predetermined number of active lines to be displayed on a screen having an aspect ratio of 16:9 from a vertically interpolated signal, and outputting a control signal for positioning an image having a screen aspect ratio of 5:3 in the middle of a screen having an aspect ratio of 16:9; vertical interpolation means for vertically interpolating an input video signal having a screen aspect ratio of 4:3 by a predetermined ratio; and buffer means for time-compressing by a predetermined rate the video signal vertically interpolated by said vertical interpolation means and then outputting said interpolated video signal according to said control signal of said window means; wherein said vertical interpolation means comprises: a plurality of ROMs where a plurality of filter coefficients used in vertical interpolation are recorded; a plurality of line memories for delaying by one line said input video signals; and a plurality of adders for adding multiplied outputs of said filter coefficients of said ROMs and said delayed signals, respectively, and outputting at the same time the respective added outputs.
Claim 3
Dependent Claim
238 words
A television screen aspect ratio converting device comprising: window means for receiving horizontal and vertical synchronizing signals separated from an input video signal, extracting a predetermined number of active lines to be displayed on a screen having an aspect ratio of 16:9 from a vertically interpolated signal, and outputting a control signal for positioning an image having a screen aspect ratio of 5:3 in the middle of a screen having an aspect ratio of 16:9; vertical interpolation means for vertically interpolating an input video signal having a screen aspect ratio of 4:3 by a predetermined ratio; and buffer means for time-compressing by a predetermined rate the video signal vertically interpolated by said vertical interpolation means and then outputting said interpolated video signal according to said control signal of said window means; wherein said buffer means comprises: a switch for selecting an output among a plurality of outputs of said vertical interpolation means by being switching-controlled with a horizontal frequency; a plurality of line memories for writing and reading a signal selected by said switch and a part of outputs of said vertical interpolation means, and controlled so as not to generate collision between read and write data according to a control signal of said window means; and a field memory for receiving an output of said line memories and outputting a video signal horizontally expanded by a predetermined rate compared with output video signals of said line memories.
Claim 4
Dependent Claim
238 words
A television screen aspect ratio converting device comprising: window means for receiving horizontal and vertical synchronizing signals separated from an input video signal, extracting a predetermined number of active lines to be displayed on a screen having an aspect ratio of 16:9 from a vertically interpolated signal, and outputting a control signal for positioning an image having a screen aspect ratio of 5:3 in the middle of a screen having an aspect ratio of 16:9; vertical interpolation means for vertically interpolating an input video signal having a screen aspect ratio of 4:3 by a predetermined ratio; and buffer means for time-compressing by a predetermined rate the video signal vertically interpolated by said vertical interpolation means and then outputting said interpolated video signal according to said control signal of said window means; wherein said buffer means comprises: a switch for selecting an output among a plurality of outputs of said vertical interpolation means by being switching-controlled with a horizontal frequency; a plurality of line memories for writing and reading a signal selected by said switch and a part of outputs of said vertical interpolation means, and controlled so as not to generate collision between read and write data according to a control signal of said window means; and a field memory for receiving an output of said line memories and outputting a video signal horizontally expanded by a predetermined rate compared with output video signals of said line memories.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-01-30 | 1998-08-01 | 1999-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-01-30 | 2002-08-01 | 2003-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-01-30 | 2006-08-01 | 2007-01-31 | $7700.00 | Window Closed / Lapsed |