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| Nuclear fuel rod straightness measuring system and method |
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| Self-correcting serial baud/bit alignment |
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| CRT Monitor with built-in camera |
| OF AN EXEMPLARY EMBODIMENT Referring generally to FIGS. 1 and 2, the present invention relates to ... |
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Apparatus for encoding television signals of different formats for transmission and decoding upon reception
| Details |
Inventors: Tsinberg, Mikhail;
Assignee: North American Philips Corporation (New York, NY)
Primary Examiner: Shepperd; John W.
Assistant Examiner:
Attorney, Agent or Firm: Marion; Michael E.
A high definition television signal having 525 lines per frame, a sequential scan, and 59.94 frames per second is encoded into a time multiplex signal for transmission. The encoder drops alternate lines, but creates line difference signals which allow reconstruction of the dropped lines at the receiver. The line difference signals are time compressed, while the luminance signals of the alternate, transmitted lines are time expanded. The encoder can accept programs from any one of a plurality of program originators, as long as the frame and line rates are multiples of one another. The time multiplex signal carries luminance and chrominance components in each line, but updates signals such as high frequency luminance, high frequency chrominance and the line difference signals in a predetermined pattern in sequential frames. At the receiver, the time multiplex signal is decoded into the original high definition signal and is further encoded directly into two channels, the first being compatible with NTSC, the second being an augmentation channel. The two channels can later be recombined, for example at a cable receiver, to create the high definition signal, while the first channel signal can be directly received on an NTSC receiver. |
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DETAILED DESCRIPTION I claim: 1.
Apparatus for generating a time multiplexed signal for transmission over a single channel having an assigned channel bandwidth, comprising: receiving means for coupling to one of first and second program originating means which respectively generate first and second television signals, said first television signal having a first predetermined number of frames per second and a second predetermined number of lines per frame, said second television signal having a first preselected number of frames per second and a second preselected number of lines per frame; wherein said first preselected number is a multiple of said first predetermined number and said second preselected number is a sub-multiple of said second predetermined number; and encoder means coupled to said receiving means to receive said one of said first and second television signals for generating a first time multiplex signal having a first format when said first television signal is received and for generating a second time multiplex signal having a second format different from said first format when said second television signal is received, said first and second time multiplex signals each having a bandwidth at most equal to said assigned channel bandwidth.
2.
Apparatus as set forth in claim 1, wherein said first predetermined number is approximately 29.
97 frames per second, and said second predetermined number is approximately 1050 lines per frame; wherein said first preselected number of frames per second is 59.
94, and said second preselected number is one-half said second predetermined number.
3.
Apparatus as set forth in claim 1, wherein said first television signal and said second television signal have, respectively, first and second synchronization signals; and wherein said encoder means comprises clock generator means for receiving, selectively, said first or said second synchronization signals and generating respectively, first or second timing signals in response thereto.
4.
Apparatus for generating a time-multiplexed signal for transmission over a single channel having an assigned channel bandwidth, comprising: program originating means for generating a high definition television signal having 525 HD lines per HD frame, 59
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Image Analysis 
