Enhanced definition NTSC compatible television system
First Claim
1. In a television transmission system including a camera with an aperatured lens and containing means for converting an optical scene or picture viewed through the lens into an electronic scan signal comprising two fields which when interlaced give approximately 525 horizontal lines which duplicate the scene, a target signal containing the two frames, means for sending such target signal in a band width of approximately 4.2 mHz to a receiver containing a viewing screen, means for interlacing the two frames for converting such signal into the original scene on the viewing screen in approximately 525 horizontal lines, the improvement which comprises increasing the fidelity of the scene on the viewing screen by increasing the lines to about 1050 lines without changing the transmission band width by modifying the aperture of the camera so that two lines are transmitted for each former line, one of the two lines containing the information in the upper half of the former line and the other of the two lines containing the information in the lower half of the original line, inserting a signal to indicate the start of the next four fields to be transmitted, utilizing a frame interlacing means whereby the complimentary half of the previous frame is superimposed on the succeeding frame with a slight vertical deflection to substantially double the number of lines on the viewing screen.
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Abstract
This invention relates to methods for transmitting and receiving high resolution television pictures which utilizes the present channel bandwidths and is compatible with present day receivers. Four fields are utilized to produce two interlaced frames. The camera is adjusted so that each scene is converted into four fields of two frames and a signal is sent to inform the receiver to interlace the two frames. Compatibility is obtained since in a 525 line receiver two of the fields are displayed on top of the other two fields.
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Citations
8 Claims
- 1. In a television transmission system including a camera with an aperatured lens and containing means for converting an optical scene or picture viewed through the lens into an electronic scan signal comprising two fields which when interlaced give approximately 525 horizontal lines which duplicate the scene, a target signal containing the two frames, means for sending such target signal in a band width of approximately 4.2 mHz to a receiver containing a viewing screen, means for interlacing the two frames for converting such signal into the original scene on the viewing screen in approximately 525 horizontal lines, the improvement which comprises increasing the fidelity of the scene on the viewing screen by increasing the lines to about 1050 lines without changing the transmission band width by modifying the aperture of the camera so that two lines are transmitted for each former line, one of the two lines containing the information in the upper half of the former line and the other of the two lines containing the information in the lower half of the original line, inserting a signal to indicate the start of the next four fields to be transmitted, utilizing a frame interlacing means whereby the complimentary half of the previous frame is superimposed on the succeeding frame with a slight vertical deflection to substantially double the number of lines on the viewing screen.
Specification
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- Resources
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Current AssigneeMichael Kerpchar
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Original AssigneeMichael Kerpchar
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InventorsKerpchar, Michael
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Primary Examiner(s)Kostak, Victor R.
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Application NumberUS07/667,038Time in Patent Office522 DaysField of Search358/152, 358/140, 358/148, 358/153, 358/147, 358/141US Class Current348/443CPC Class CodesH04N 25/41 Extracting pixel data from ...H04N 7/015 High-definition television ...H04N 7/12 Systems in which the televi...
