KR19990019795A - Secret Screen Recording / Playback Device and its Method in Cable TV System - Google Patents

Abstract

The present invention relates to the recording and playback of a non-finished screen in a cable television (CATV) system. When the non-finished screen recording mode is set by a user's remote control operation and a password is input, a random signal for recording the non-finished video is recorded. Generates a keycode value, inserts the generated random signal keycode value into a non-finished video signal, records it, and inputs when an external input of a subscriber terminal is set during playback and a password for reproducing the recorded secret screen is input. It extracts the inserted signal for the clearing of the secreted video signal and sets the key code value for the clearing of the random signal generator according to the extracted clearing signal so as to clear the recorded secreted picture.

Description

Secret Screen Recording / Playback Device and its Method in Cable TV System

The present invention relates to the recording and playback of a sparked screen in a cable television (hereinafter referred to as CATV) system. The present invention relates to an apparatus for recording a secret screen of a CATV, and a method thereof.

In general, the CATV system scrambles (deactivates) the video and audio from a broadcasting station so that the subscriber can watch the video only for a subscriber subscribed for a fee, and the subscriber deactivates the non-engraved video and audio by using the subscriber terminal device. And a system for restoring and viewing the audio signal.

As shown in FIG. 1, a general connection diagram of a subscriber station of a general CATV system, a VCR, and a TV for reproducing or recording a non-scratched screen as described above is shown.

Here, reference numeral 10 denotes a subscriber station for restoring the non-visualized video and audio signal transmitted from the CATV broadcast signal line 1 to the video and audio signal before the non-encrypted signal, and reference numeral 20 denotes a restore from the subscriber station 10. A VCR for recording and playing back a video and audio signal, and reference numeral 30 denotes a TV for watching a video and audio reproduced from the subscriber station 10 and a video and audio played back in the VCR 20.

Referring to the recording and reproducing operation of the conventional CATV system having such a configuration, first, the CATV broadcast signal transmitted from the CATV subscriber line 1 is demodulated into a video and audio signal secreted by the subscriber terminal 10, and then again the original. The video and audio signals are restored to the VCR 20 to be recorded or transmitted to the TV 30 so that the video is displayed on the monitor and the audio can be transmitted through the speaker.

If the user wants to record the secreted video and audio transmitted from the CATV broadcasting station, the user terminal 10 releases the CATV signal from the CATV subscriber line 1 and cancels the secreted video and audio signal. When the VCR 20 is operated to reproduce the recorded video and audio after being deactivated according to the needs of the viewer, the VCR 20 plays back the restored recorded video and audio. By directly delivering to the TV 30, the user can watch the video and sound de-secreted.

FIG. 2 is a block diagram of a descrambler provided in the subscriber terminal 10 to make a video signal before it is secreted into a video signal before being secreted.

Here, reference numeral 11 denotes a line selector for selecting a horizontal synchronization signal required for decryption from the input video signal that has been encrypted, and reference numeral 12 extracts a signal necessary for decryption from the signal output from the line selector 11, A data extractor for generating a clearing control signal, and reference numeral 13 denotes a random signal generator for outputting a random signal of a predetermined pattern which can be cleared.

Reference numeral 14 denotes an image buffer for buffering and outputting the input non-image signal, reference numeral 15 denotes an image inverter for outputting the phase-inverted input non-image signal, and reference numeral 16 denotes the random signal generator 13. The video multiplexer selects one of the signals from the image buffer 14 or the image inverter 15 according to the signal output from the N-th output signal.

The descrambler having such a configuration first demodulates the non-CATV broadcast signal inputted from the subscriber station 10 into a video and audio signal, and separates the non-FIG video and audio signal. The horizontal synchronization signal for releasing the secret from the selector 11 is selected and transmitted to the data extractor 12. Then, the data extractor 12 extracts a signal for decryption from the transmitted secret signal and outputs the corresponding secret signal control signal to the random signal generator 13. Accordingly, the random signal generator 13 provides a selection signal in the video multiplexer 16 in synchronization with the transmitted secretion control signal. On the other hand, the input non-video signal is buffered in the image buffer 14 and transmitted to one input terminal of the video multiplexer 16, and at the same time the non-encoded video signal is phase-inverted by the video inverter 15 so that the video multiplexer ( It is transmitted to the type force stage of 16). Then, the video multiplexer 16 selects one of the image signals obtained from the image buffer 14 and the image inverter 15 according to a predetermined pattern selection signal generated by the random signal generator 13 to release the secret. It will be output as a signal.

However, the above-described conventional CATV system cannot release the CATV broadcast signal and record it, so that viewing cannot be restricted, and sometimes a minor may watch a recorded adult pro.

In other words, the existing CATV system is multi-channel and there are many adult programs. Especially, when recording, the user releases the secreted CATV broadcast signal and then records it, so anyone can watch the recorded video. There was a problem that the viewing can not be restricted so that minors can not see.

Accordingly, the present invention has been proposed to solve various problems that occur during recording and playback of the conventional CATV system as described above, and an object thereof is to record the non-engraved screen as it is and to easily descramble the non-engraved screen during playback. The present invention provides a CATV non-screen recording / playback apparatus and method thereof for viewing.

1 is a general wiring diagram of a subscriber terminal and a VCR and a TV of a conventional CATV system.

2 is a detailed configuration diagram of a descrambler provided in the subscriber station of FIG.

3 is a connection diagram between a subscriber terminal for recording a secret screen and a VCR and a TV in the present invention.

4 is a connection diagram of a subscriber terminal, a VCR, and a TV for viewing a screen recorded on a secret screen in the present invention.

5 is a detailed configuration diagram of a descrambler provided in a subscriber station according to the present invention.

Figure 6a is a signal flow diagram illustrating a method for recording a secretion screen in the present invention.

6B is a signal flowchart showing a method of reproducing a recorded secretion screen in the present invention.

* Explanation of symbols for main parts of the drawings

40: subscriber station 41: input signal selector

42: line selector 43: selection signal generator

44: image buffer 45: image inverter

46: Video Multiplexer 47: Adder

50: VCR 60: TV

The present invention for achieving the above object, the input signal selection means for selecting and outputting one of the demodulation signal and the external input signal of the CATV broadcast signal and a key code for recording the secreted video selected by the input signal selection means A line selection means for generating a value and extracting a signal for decrypting the secreted image and a signal for releasing a secreted image selected by the input signal selecting means, and extracting a signal or secreted image according to the extracted signal Selection signal generating means for generating a selection signal of a predetermined pattern for selecting the inverted image and image selection means for selecting and outputting one of the non-engraved image and the non-enhanced image in accordance with the selection signal obtained by the selection signal generating means; And a signal obtained from the image selecting means and the line selecting means. Outputting an image or acid by sparking the spark takes place in the released image adding means for output.

In accordance with another aspect of the present invention, there is provided a method of recording a secret screen by generating a random signal keycode value for recording a secret image when the secret screen recording mode is set by a user's remote controller and a password is input. And inserting one random signal keycode value into the secreted video signal and outputting the same to the recording apparatus.

In order to achieve the object of the present invention, a method for reproducing a secretion screen extracts an inserted signal for clearing a secret from a secret image signal reproduced when an external input of a subscriber terminal is set and a password for reproducing a recorded secret screen is input. And setting a keycode value for deactivation of the random signal generator according to the signal for deactivation extracted in the step so as to deencord the recorded deactivation screen.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail.

3 is a connection diagram between a subscriber terminal, a VCR, and a TV for recording a secret screen in the present invention. As shown in the figure, during recording, the secreted video obtained from the subscriber station 40 is recorded as it is on the VCR 50, and only in the subscriber station 40, a random signal keycode value for extracting the later secreted screen is shown. Only the picture is inserted into the recorded picture.

FIG. 4 is a connection diagram of a subscriber station, a VCR, and a TV for watching an image recorded on a secret screen according to the present invention. As shown in the drawing, the picture screen recorded on the VCR 50 is reproduced and transmitted to the subscriber station 40, and the subscriber station 40 extracts a signal for releasing the picture screen from the picture screen and displays the picture screen. By setting the key code value of the random signal generator for releasing, the reproduced secretion screen is de-secreted. The released image is transmitted to the TV 60 so that the user can watch it.

5 is a detailed configuration diagram of a descrambler provided in the subscriber station 40 according to the present invention. Here, reference numeral 41 denotes an input signal selector for selecting one of the demodulated CATV broadcast signal Q and an external input signal R according to a user's operation, and reference numeral 42 denotes an input signal selector 41 in recording. A line selector for generating a random signal keycode value by extracting a signal for decryption from the selected secretized image and setting a keycode value of the random signal generator by extracting a signal for decrypting the secreted image during playback; Reference numeral 43 extracts a signal for secretion release from the secreted image selected by the input signal selector 41 and generates a selection signal of a predetermined pattern for selecting the secreted image or the non-secreted inverted image according to the extracted signal. Is a selection signal generator.

Reference numeral 44 denotes an image buffer for buffering the secreted image selected by the input signal selector 41, reference numeral 45 denotes an image inverter for phase-inverting the secreted image, and reference numeral 46 denotes the selection signal generator 43. A video multiplexer for selecting one of the outputs of the image buffer 44 or the image inverter 45 according to the generated random signal keycode value, and reference numeral 47 denotes a signal obtained from the video multiplexer 46 and the line selector. It is an adder which adds the signal obtained at (42).

The operation of the apparatus for recording and reproducing a screen for recording according to the present invention having such a configuration and the method for recording and reproducing a screen for recording according to the present invention will be described in detail with reference to FIGS. 3 to 6.

First, as shown in FIG. 6A, when the recording mode of the secret screen is set by the user's key operation, and a password for recording the secret screen is input by the user, the input signal selector (in the subscriber terminal 40) ( 41 selects and outputs a demodulated non-video signal Q. Then, the line selector 42 extracts a signal for releasing a later picture from the input picture, and generates a random signal function value according to the extracted signal to the selection signal generator 43 and the adder 47. Each will be entered. Accordingly, the line selector 43a in the selection signal generator 43 extracts the horizontal synchronizing signal from the secret image selected by the input signal selector 41, and the data extractor 43b extracts the signal from the signal through the line selector 43a. It extracts data for clearing and generates a control signal corresponding thereto. The random signal generator 43c generates a video selection signal according to the control signal and a random signal generation function value obtained from the line selector 42 to generate a video. Provided to the multiplexer 46 as a selection signal. In this case, the video selector 46 selects and outputs one of the secreted image through the image buffer 44 and the phase inverted secret image through the image inverter 45 according to the selection signal, and the adder 47 selects the selected image. A key code value for releasing a picture of a picture generated by the line selector 42 is inserted into the picture of the picture and transmitted to the VCR 50 as a picture of the picture so that the picture of the picture is recorded.

Next, as shown in Fig. 6B, when the user sets an external input of the subscriber terminal to reproduce the recorded secret screen and inputs a password for playing the secret screen, the input signal selector 41 is displayed. Selects and outputs an external input R, that is, a picture of a picture reproduced by the VCR 50, and the line selector 42 receives a signal for releasing a picture of a previously inserted picture from the selected picture of reproduced picture. After the extraction, the randomization key code value of the random signal generator is set. Then, the line selector 43a, the data extractor 43b, and the random signal generator 43c in the selection signal generator 43 extract a signal for releasing the input sparking screen as described above, and control according to the extracted signal. According to the signal and the random signal generation key code value set by the line selector 42, a random signal for releasing a secret image is generated as a selection signal. Accordingly, the video multiplexer 46 selects one of two images input according to a selection signal for releasing the secret image, that is, a secret image through the image buffer 44 and an inverted secret image through the image inverter 45. The non-deactivated video signal is outputted, and the de-non-decoded video signal is transmitted to the TV 60 after passing through the adder 47 so that the viewer can watch the recorded video on the non-engraved screen.

As described above, the apparatus for recording / playing a secret screen according to the present invention and a method of recording a secret screen according to a user's selection at the time of recording and inserting a password prevent playback of a normal video when the correct password is not input during playback. This is not possible, so it has the effect of preventing minors from watching recorded adult pros.

Claims (3)

Input signal selection means for selecting and outputting a demodulation signal (Q) and an external input signal (R) of the CATV broadcast signal and a signal for releasing the decoded video selected by the input signal selection means during recording, Line selection means generated as a function value of a signal generator and setting a key code value of a random signal generator by extracting a signal for releasing the non-engraved image during reproduction and a key code of the random signal generator generated by the line selection means. Image selection means for generating a selection signal of a predetermined pattern according to a value, and image selection means for selecting and outputting one of the non-enhanced image and the non-enhanced image according to the selection signal obtained by the selection signal generating means and the image selection The image selected by the means and the signal obtained by the line selecting means are added to output or decode the decoded image. And an adding means for outputting the subtracted video. When the secret image recording mode is set by a user's remote controller operation and a password is input, generating a random signal key code value for recording the secret image and inserting the generated random signal key code value into the secret image signal. Secreting screen recording method of the CATV system, characterized in that it comprises the step of outputting to the recording device. If an external input of the subscriber terminal is set and a password for playing the recorded secret screen is input, extracting the inserted signal for clearing the secret from the input secret video signal and according to the signal for clearing the secret extracted in the step And setting a keycode value for clearing the random signal generator to clear the recorded secret screen.