Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1983-05-17
1986-08-05
Buczinski, S. C.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358123, 178 2212, 178 2219, H04N 7167, H04L 900
Patent
active
046046500
ABSTRACT:
The invention comprises a system for scrambling, transmitting and descrambling the video portion of a TV signal. In the preferred embodiment two serial memories (charge coupled devices) are utilized to store data representing selected portions of the video to be scrambled. The charge coupled devices are selectively clocked to interchange portions of video, with the point at which the interchange occurs determined by a code pattern generator and changing in a predetermined manner. The point of interchange is updated or changed as determined by a code pattern generator and changing every three lines of the TV signal. Descrambling is accomplished by an identical hardware arrangement with the exception that the code pattern generator at the descrambler is synchronized with the code pattern generator in the scrambler. Synchronizing information can be transmitted to the descrambler in any convenient fashion including inserting the data in an unused video line of the vertical retrace interval.
REFERENCES:
patent: 2972008 (1961-02-01), Ridenour et al.
patent: 3872503 (1975-03-01), Shutterly
patent: 4266243 (1981-05-01), Shutterly
patent: 4396946 (1983-08-01), Bond
patent: 4405942 (1983-09-01), Block et al.
Borsuk Gerald M.
DelCoco Robert J.
Lampe Donald R.
Buczinski S. C.
Sutcliff W. G.
Wallace Linda J.
Westinghouse Electric Corp.
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