KR960006372A - Method and apparatus for scrambling and descrambling of integrated cable broadcasting system - Google Patents

Abstract

The scramble and descramble apparatus and method of the present invention are applied to integrated cable broadcasting as a reversal technique of a video signal which is intended to prevent deterioration of image quality and illegal illustration of a picture at a receiving end. In the scrambler and the descrambler of the present invention, the scrambler inserts an inverted reference signal into a part of the image signal, extracts the received signal inverted reference signal, and inverts the image using the extracted inverted reference signal to generate the signal according to the change in gain of the line. It is a technology to prevent the afterimage effect that may occur. Therefore, it is possible to manufacture a descrambler capable of obtaining a simple, low-roll, high-quality image.

In addition, by maintaining the inversion reference signal at 50 IRE level, the signal level at the time of inversion and non-inversion is similar, and also increases the security level of the scramble system by eliminating the possibility of determining whether the inversion is shown.

Description

Method and apparatus for scrambling and descrambling of integrated cable broadcasting system

As this is a public information case, the full text was not included.

5 is a schematic block diagram for explaining a scrambler according to the present invention.

7 is a schematic block diagram for explaining a descramble device according to the present invention.

Claims (12)

11. An apparatus for receiving a video signal and scrambled through video inversion, comprising: means for inserting an inverted reference signal into the video signal when the video signal is reversed; And a control signal generator for generating a control signal and supplying the inverted reference signal to the video signal so as to be inserted into the video signal. 2. The apparatus of claim 1, wherein the inversion reference signal insertion means comprises: an inversion reference signal generator for generating the inversion reference signal; A non-inverting / inverting unit which receives the video signal and non-inverts or inverts the input video signal according to an inversion reference signal from the inversion reference signal generator; And a selection unit which receives an output signal from the non-inverting / inverting unit and an output signal of the inverting reference signal generator and outputs an image signal in which an inverting reference signal is selectively inserted under the control of the control signal generator. Scrambler. The scrambler of claim 2, further comprising an amplifier connected to an output terminal of the selector to amplify and output the selected video signal. The scrambler according to any one of claims 1 to 3, wherein the inversion reference signal is inserted into a back porch portion of the video signal in accordance with a control signal from the control signal generator. A method for receiving a video signal and scrambled through a video inversion, the method comprising: inserting an inverted reference signal into a video signal when the video signal is inverted; And generating and supplying a control signal to the inserting means so that the inverted reference signal is inserted into the video signal. The method of claim 5, wherein the inverting reference signal inserting step comprises: generating the inverting reference signal; A non-inverting / inverting step of receiving the video signal and non-inverting or inverting the input video signal according to an inversion reference signal from the inversion reference signal generating step; And receiving an output signal from the non-inverting / inverting step and an output signal of the inversion reference signal generator, and outputting an image signal in which an inversion reference signal is selectively inserted under the control of the control signal. Scramble method. The scramble method according to claim 6, further comprising an amplifying step of amplifying and outputting the selected video signal after the outputting step. The scramble method according to any one of claims 5 to 7, wherein the inversion reference signal is inserted into a back porch portion of the video signal according to the control signal. An apparatus for receiving and descrambled scrambled video signals, comprising: means for extracting an inverted reference signal from the received scrambled video signal; Means for inverting and non-inverting the scrambled video signal using the extracted inverted reference signal; And selecting means for selectively outputting the inverted and non-inverted signals according to a random control signal. 10. The descrambler according to claim 9, further comprising an amplifier connected to an output terminal of the selection means to amplify and output the selected video signal. A method of receiving and descrambled scrambled video signals, the method comprising: extracting an inverted reference signal from the received scrambled video signal; Inverting and non-inverting the scrambled video signal using the extracted inverted reference signal; And a selective step of selectively outputting the inverted and non-inverted signals according to a random control signal. The descramble method of claim 11, further comprising an amplifying step of amplifying and outputting the video signal selected in the selecting step. ※ Note: The disclosure is based on the initial application.