MULTIPLEX VIDEO TRANSMISSION SYSTEM

• US 3,725,571 A
• Filed: 06/21/1971
• Issued: 04/03/1973
• Est. Priority Date: 06/21/1971
• Status: Expired due to Term

• Current Assignee: James W.H. Justice
• Original Assignee: James W.H. Justice
• Inventors: Justice, James W. H.
• Primary Examiner(s): Richardson, Robert L.
• Application Number:
  US05/155,078
• Time in Patent Office: 652 Days
• Field of Search: 178/5.6,5.8,6,6.8,7.1,7.2,DIG.3,DIG.23,5.2R,5.4R,6.5
• US Class Current: 348/386.1
• CPC Class Codes: H04N 7/0806 the signals being two or more video signals H04N7/0803, H04N7/081 take precedence

Abstract

System of receiving a plurality of n-separate pictures wherein every nth line of each of the pictures is selected for transmission beginning at a different line and wherein reception of the selected one of the pictures is accomplished by selecting from the plurality of lines transmitted every nth line commencing at the preselected line, with the selected line being delayed by a medium having a bandwidth less than the bandwidth of the video pictures and recombined with the undelayed selected line so that the selected one of the pictures may be displayed with highquality resolution.

Claims

1. A method of receiving a plurality of n-separate color video pictures including luminance and chrominance portions in the form of a plurality of lines including the nth lines of each of said pictures commencing from a different preselected line at each of said plurality of pictures, comprising the steps of:

selecting the nth line from said plurality of lines commencing at a preselected line so that these lines are selected from one of said plurality of color video pictures;

said color video pictures including luminance and chrominance portions;

delaying said luminance and chrominance portions of said selected lines for substantially n-1 line time periods, said luminance portion being delayed by a medium having a bandwidth less than the bandwidth of said luminance portion;

combining said selected lines which are delayed with those which are undelayed; and

displaying said selected and combined lines so that an undelayed line is followed by a corresponding delayed line.

2. In a system for receiving a plurality of n-separate video pictures in the form of a plurality of lines including the nth line of said plurality of pictures commencing from a different preselected line in each of said plurality of pictures, the combination of:

means for selecting the nth line from said plurality of lines commencing at a preselected line so that the lines are selected from one of said plurality of pictures;

means for delaying said selected lines for substantially n-1 line time periods, said means for delaying having a predetermined bandpass characteristic;

means for providing a subcarrier signal falling within the band of said bandpass characteristic;

means for modulating said subcarrier signal with said selected lines prior to application to said means for delaying;

means for demodulating the modulated signals after being delayed in said delay means;

means for combining said selected lines which are undelayed with those which are delayed; and

means for displaying said selected and combined lines so that an undelayed line is followed by a corresponding delayed line.

3. The combination of claim 2 wherein said plurality of n-separate pictures of color video pictures including luminance and chrominance components:

said delay means includes a luminance delay channel including filter means for eliminating the color subcarrier from said color video pictures;

a luminance delay line having a bandwidth less than said color video pictures and having a predetermined bandpass characteristic wherein said color subcarrier frequency falls within the band of said bandpass characteristic;

means for providing a color subcarrier signal at the transmitted color subcarrier frequency;

modulating means for modulating said subcarrier signal with said selected lines prior to application to said luminance delay line;

means for demodulating the modulated signals after being delayed in said luminance delay line;

said means for combining includes luminance combining means for combining the undelayed luminance and the delayed luminance signals;

a chroma delay channel includes said means for delaying includes a chroma delay line having substantially the same bandwidth and bandpass characteristic as said luminance delay line;

said means for combining includes chroma combining means for combining the delay chroma signals and the undelayed chroma signals.

4. In a system for transmitting and receiving a plurality of n-separate color video pictures including luminance and chrominance portions, the combination of:

means for selecting every nth line of each of said plurality of color video pictures commencing at a different preselected line for each of said pluraliTy of color video pictures;

means for transmitting the selected lines in the order selected of each of said plurality of color video pictures in the form of a plurality of lines;

means for selecting the nth line from said plurality of lines commencing at a preselected line so that the lines are selected from one of said plurality of color video pictures;

means for delaying said luminance and chrominance portions of said selected lines for substantially one line time period, said luminance portion being delayed by a medium having a bandwidth less than the bandwidth of said luminance portion;

means for combining said selected lines which are undelayed with those which are delayed; and

means for displaying said selected and combined lines as said selected one of said plurality of color video pictures so that an undelayed line is followed by a delayed line.

5. In a system for receiving a plurality of n-separate color video pictures including luminance and chrominance portions in the form of a plurality of lines including the nth line of said plurality of pictures commencing from a different preselected line in each of said plurality of pictures, the combination of:

means for selecting the nth line from said plurality of lines commencing at a preselected line so that the lines are selected from one of said plurality of color video pictures, said color video pictures including luminance and chrominance portions;

means for delaying said luminance and chrominance portions of said selected lines by substantially n-1 line time periods, said luminance portion being delayed by a medium having a bandwidth less than the bandwidth of said luminance portion;

means for combining said selected lines which are undelayed with those which are delayed; and

means for displaying said selected and combined lines so that an undelayed line is followed by a corresponding delayed line.