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| Periodical signal detection circuit within a variable window length |
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| Image signal selector for television receiver combined with video cassette recorder |
| OF THE INVENTION Referring to the drawing, the invention shall be described in details. According ... |
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Universal signal processor and method of processing
| Details |
Inventors: Guralnick, Brian; Paterno, Greg;
Assignee: Jarque; Greg (Holbrook, NY)
Primary Examiner: Barron, Jr.; Gilberto
Assistant Examiner:
Attorney, Agent or Firm: Collard & Roe, P.C.
A method for decoding and reconstructing a scrambled video signal is provided in which a scrambled video signal is received and the location of at least one predetermined element of the scrambled video signal is determined. Next, a horizontal sync is generated at the proper location of an output signal in response to the location of the at least one predetermined element of the scrambled video signal. Finally, the remainder of the scrambled video signal is output as an unscrambled video signal. A method of encoding a video signal is also provided, which comprises the steps of receiving an unscrambled video signal and producing a scrambled video signal by altering at least one predetermined element of the unscrambled video signal without providing encoding data to aid in the decoding of the scrambled video signal. An apparatus for decoding and reconstructing a scrambled video signal is also provided, which comprises a tuner for receiving and tuning a scrambled video signal and a transition tester coupled with the tuner for testing the scrambled video signal to determine the location of at least one predetermined element of the video signal. A video processor receiving an indication substantially corresponding to the determination of the at least one predetermined element from the transition tester is also provided. The video processor generates and outputs a horizontal sync in response to the indication from the transition tester. A selector coupled with the video processor outputs the remainder of the scrambled video signal as an unscrambled video signal. |
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DETAILED DESCRIPTION Generally speaking, in accordance with the invention, a method for decoding and reconstructing a scrambled video signal is provided in which a scrambled video signal is received and the location of at least one predetermined element of the scrambled video signal is determined.
Next, a horizontal sync is generated at the proper location of an output signal in response to the location of the at least one predetermined element of the scrambled video signal.
Finally, the remainder of the scrambled video signal is output as an unscrambled video signal.
In a more preferred embodiment, a method for decoding and reconstructing a scrambled video signal is provided.
This method comprises the steps of receiving a scrambled video signal, dividing the scrambled video signal into an inverted scrambled video signal and a non-inverted video signal and locating a horizontal sync of at least one of the inverted scrambled video signal and non-inverted video signal.
Next, a horizontal sync signal is generated at the proper location of at least one predetermined element of an output signal in response to the location of the at least one predetermined element of the scrambled video signal.
Next, it is determined whether the scrambled video signal is inverted.
Then a color burst from the scrambled video signal is output as part of an unscrambled video signal for a predetermined time when the scrambled video signal is not inverted and a color burst from the inverted scrambled video signal is output as part of an unscrambled video signal for a predetermined time when the scrambled video signal is inverted.
Additionally, active video from the scrambled video signal is output as part of an unscrambled video signal for a predetermined time when the scrambled video signal is not inverted and active video from the inverted scrambled video signal as part of an unscrambled video signal is output for a predetermined time when the scrambled video signal is inverted.
In an additional embodiment, the invention includes A method of encoding a video signal, which comprises the steps of receiving an unscrambled video signal and producing a scrambled video signal by altering at least one predetermined element of the unscrambled video signal without providing encoding data to aid in the decoding of the scrambled video signal
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TV Signal 
