KR19990001702U - VSI system with copy protection - Google Patents

Abstract

The present invention relates to a VSI system having a copy protection function used to prevent unauthorized copying of an image tape, and a conventional copy protection device inserts a copy protection signal into a video signal and thus a copy protection signal is inserted. When playing back a tape, the picture quality is poor due to the video signal being out of sync, but copying is possible. Therefore, a means was needed to solve this problem more actively.

In order to solve such a problem, the present invention is a color signal processing circuit of a VSI system, and the input terminal and recording reception of the color killer unit 45 which blocks the color signal output when the black and white positive signal is input so that noise is not recorded from the color signal. When the output voltage level output from the age circuit portion 47 is equal to or greater than the reference voltage of the zener diode 48 between the age circuit portions 47 which always maintain the constant output gain level of the system signal. And a comparator 49 for outputting an active high signal to operate the color killer 45.

Description

VSI system with copy protection

The present invention relates to a copy protection system of VSIAL used to prevent unauthorized copying of a video tape, and particularly, to prevent unauthorized copying of contents recorded on the video tape by a general consumer. When the copy protection signal is inserted in the output signal, the color killer unit is automatically operated so that the color is not recorded intermittently during tape copy, so that the copy protection can be practically reliable.

In general, the VSI system is an electronic device that is generally used together with a TV receiver, and the conventional circuit of the system having a copy protection function in the VSI system is disclosed in Korean Patent Application Publication No. 1212, Publication No. 94-4567. Known and circuit block diagrams thereof are shown in FIG.

Here, a remote controller 21 which performs password input for copy protection, a preamplifier 22 which receives a signal transmitted from the remote controller 21 and provides it to the microcomputer 24, a function switch 23 and a microcomputer. Computer 24, deck portion 25, signal processing portion 26, vertical synchronization separation portion 28, divider 27, synchronous separation portion 29, OSD portion 30, amplifier 31, 32), rust switch 33, control head 34 and the like.

In such a system, when a user inputs a copy number for copy protection through the remote controller 21 or the like, the microcomputer 23 drives the deck unit 25 to perform recording, and the control head (a) through the amplifier (31). Providing an encryption pulse code at 34) resulted in the encryption information for copy protection being recorded on the control track of the tape being recorded.

For example, the encryption information recording process for copy protection in the control track of the tape in such a system is shown as shown in FIG.

In this case, it is checked whether the system is in the recording mode, and in the recording mode, the recording operation is performed (steps 310 and 320).

After that, the character display screen is output through OSD (Step 330). If the password input is completed, the password is entered. If the password is completed, the set password is recorded on the control track. When the process went to the input step or the end step, and not in step 310, the selected operation was performed (steps 340 to 370).

However, in such a conventional system, copy protection password information is recorded on a control track of a recording tape for copy protection, and a copy operation cannot be performed when there is no password input, but the password information is registered in a set on an OS program. When the tape copy is performed using a set in which such cipher information is not registered, the copy protection cipher record is disabled and a copy operation is arbitrarily performed.

Another conventional copy protection apparatus includes a first VCR1 for reproducing contents recorded on an original tape and a second VCR2 for recording reproduction contents of an image on a new tape as shown in FIG. Is connected via a video output line (Audio) and an audio output line (Audio), respectively, and a copy protection for inserting a signal having a deteriorated level while having a sudden level change in the video output line (Video) to which the video signal is output. It was configured to connect the signal insertion device 10.

The conventional copy protection device having the above configuration reproduces the video signal and the audio signal recorded on the original video material in the first VCR1, respectively, and outputs them through the video output line and the audio output line. The copy protection signal inserting device 10 generates a copy protection signal having a sharp level change and a synchronized synchronization to prevent copying, and puts it in the vertical blanking period of the video signal output to the video output line. The video signal mixed with the prevention signal and the audio signal passing through the audio output line Audio are recorded on a new tape in the second VCR2.

Therefore, when playing a new tape, it is possible to play back video signals without any problem.However, when copying a new tape to another tape, a copy protection signal recorded with the video signal causes problems such as interference on the copy screen. It is not allowed to be copied by the general consumer.

However, such a conventional copy protection device inserts a signal for copy protection into a video signal and reproduces a tape in which the copy protection signal is inserted. Therefore, a means was needed to solve this problem more actively.

The purpose of the present invention is to automatically prevent the copying of the contents recorded on the videotape by the general consumer to prevent the unauthorized copying by inserting the copy protection signal into the video output signal of the AGE circuit unit. The color killer unit is operated to prevent the recording of color intermittently during tape copying to provide a VSI system having a copy protection function to enable a reliable copy protection.

In particular, the present invention provides a color signal processing circuit of a VSI system in order to realize the object of the above example, wherein when a black and white video signal is input, the color killer outputs a color killer so that no noise is recorded from the color signal and a recording mode is performed during recording. The color killer outputs an active high signal when the output voltage level output from the age circuit unit is greater than the reference voltage of the zener diode between the circuits for keeping the output gain level of the receiver signal constant at all times. It is characterized in that it comprises a comparator and the like for the additional operation.

Hereinafter, more specific features of the present invention will be understood by describing the same in detail with the accompanying drawings.

1 is a circuit block diagram of a conventional Video Cassette Recorder (VCR) system with copy protection;

Figure 2 is an example of the copy protection encryption recording program in Figure 1,

3 is a block diagram showing a connection state of a conventional copy protection signal insertion device;

4 is a system circuit block diagram having a copy protection function according to the present invention.

** Explanation of symbols on the main parts of the drawing **

40: band pass filter 41: ACC

42: frequency converter 43: low pass filter

44: Burst Ampersis 45: Color Killer Part

46: record amplifier 47: age circuit

48: Zener Diode 49: Comparator

As shown in FIG. 4, the present invention provides a band pass filter 40 for filtering a video input signal into a predetermined frequency band, an ACC 41 for adjusting a level of a color signal to a constant value, a frequency converter 42, A low pass filter 43 for filtering signal components and converting them into low-conversion color signals; The color killer in a color signal processing circuit of a VSI system composed of a color killer unit 45 for preventing noise from being recorded, and a recording amplifier 46 for amplifying a signal passing through the color killer unit 45. The output voltage level output from the age circuit portion 47 between the input terminal of the section 45 and the age circuit portion 47 which always maintains the constant output gain level of the recording reception system signal. When compared to the reference voltage of the zener diode 48 it is more than the reference voltage to output an active high signal to be configured to include a comparator 49 such as to operate the said color killer portion 45.

Referring to the operation of the present invention configured as described in detail as follows.

First, the user inserts the original program tape and the blank tape into the deck such as the VSI to the VD or the duplicater, and copies the program contents from the original tape to the blank tape. (Not shown) to provide a recording command to the microcomputer (not shown).

At this time, the microcomputer receives the original program signal from the outside while driving the blank tape and provides the recording signal to the video signal processing ish unit (not shown) through the age circuit unit 47.

In particular, the age circuit section 47 automatically adjusts this when the input signal level changes so that the output synchronization level of the recording reception system signal is always constant.

In general, the video signal is divided into a luminance signal and a color signal in a signal recorder, and then processed, respectively. When the color signal is input to the color signal processing circuit, the band pass filter 40 sequentially filters a predetermined frequency band and the level of the color signal. ACC 41 for adjusting to a constant value, a frequency converter 42, a low pass filter 43 for filtering signal components and converting them into low-conversion color signals, and burst amplification for doubling only color burst signals of color signals. 44, a color killer section 45 for blocking the output of the color signal so that noise is not recorded from the color signal, and a recording amplifier 46 after passing through the color killer section 45, respectively. After amplification, it is recorded on tape through the video head.

However, if the received video signal of the original program tape and the copy protection signal inserted between the video signal are input to the age circuit unit 47 together, the age circuit unit 47 outputs a higher voltage level correspondingly. do.

In addition, when the output voltage level output from the age circuit portion 47 is equal to or greater than the reference voltage of the zener diode 48 between the front end of the age circuit portion 47 and the color killer portion 45, A comparator 49 for outputting an active high signal is provided.

Therefore, when the composite signal mixed with the received video signal and the copy protection signal is applied to the (+) input terminal of the comparator 49 when the tape is copied and becomes larger than the reference voltage of the zener diode 48, the zener diode 48 becomes active. The high signal is output and the color killer 45 is operated accordingly.

For reference, the color killer 45 blocks the color signal output when the black and white signal is input so that noise is not recorded from the color signal. That is, color signal noise which is mistaken for a color signal and is amplified excessively is prevented from being recorded.

Therefore, the color signal becomes unstable recording while the screen becomes dark and bright during tape copying.

For reference, at this time, if the (+) input terminal of the comparator 49 corresponds to a pure video signal having a constant voltage level (for example, having a voltage less than the zener diode reference voltage) passed through the age circuit unit 47 When the age voltage level is applied, the comparator 43 outputs a logic 0 signal, and thus the color killer 45 is stopped.

Therefore, at this time, the color signal is normally processed and recorded on the tape through the video head normally.

The present invention has a color killer unit 45 automatically when a copy protection signal is inserted into the video output signal of the age circuit unit 47 in order to prevent unauthorized copying of the contents recorded on the videotape by the general consumer. It is operated so that color is not recorded intermittently during tape copying, so that there is an effect that the copy protection can be reliably practical.

Claims (1)

A band pass filter 40, an ACC 41, a frequency converter 42, a low pass filter 43, a burst amplification 44, a color killer portion 45, and the color killer portion ( A VSI color signal processing circuit comprising a recording amplifier 46 or the like which amplifies a signal passing through the signal 45, wherein the output gain level of the input terminal of the color killer 45 and the recording reception system signal are always kept constant. Between the age circuit unit 47, the output voltage level output from the age circuit unit 47 is compared with the reference voltage of the zener diode 48 to output an active high signal when the reference voltage is higher than the color killer unit ( 45) A BD system having a copy protection function, characterized in that it comprises a comparator (49) or the like for operating.