KR19990001706U - 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 provides a VSI system having an audio signal processing IC 40 for receiving and processing an audio signal and a video signal processing IC 41 for receiving and processing a video signal. Between the AGC end of the video signal processing unit 41 and the front end (A) or the rear end (B) of the audio signal processing unit 40, a copy protection function is performed after determining whether or not the copy protection signal is mixed. The control unit 42 is characterized in that it is provided.

Description

VSI system with copy protection

The present invention relates to a VSI system having a copy protection function used to prevent unauthorized copying of an image tape, and in particular, a video signal processing to prevent unauthorized copying of contents recorded on an image tape by a general consumer. When the copy protection signal is inserted into the video output signal of the AGC stage forming the Ishibu, the audio signal output is automatically stopped so that the user can not record the audio signal when copying the tape, thereby making the copy protection 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.

An object of the present invention is to copy an audio signal when copying a tape on which a video signal containing a copy protection signal is inserted to prevent unauthorized copying of contents recorded on an image tape by a general consumer so as to improve the above problems. The present invention provides a VSI system having a copy protection function that makes it impossible to record the data, thereby making the copy protection reliable.

In particular, the present invention provides an audio signal processing IC for receiving and processing an audio signal, and a video signal processing IC for receiving and processing a video signal. Between the AGC stage of the ice sheet and the front end (A) or the rear end (B) of the audio signal processing ice section is characterized in that the copy protection control unit is provided to determine the presence or absence of the copy protection signal and to act as a switching.

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,

5 is a circuit diagram showing a copy protection controller of the present invention.

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

40: audio signal processing ish unit 41: video signal processing ish unit

42: copy protection control circuit 43: Zener diode

44: comparator

As shown in FIG. 4 and FIG. 5, the present invention includes a VSI having an audio signal processing IC 40 for receiving and processing an audio signal, and a video signal processing IC 41 for receiving and processing a video signal. In the system, between the AGC terminal of the video signal processing unit 41 and the front end A of the audio signal processing unit 40, a copy protection control unit which determines the presence or absence of mixing of the copy protection signal and plays a switching role ( 42).

In addition, a copy protection controller 42 is provided between the AGC stage and the rear end B of the audio signal processing unit 40 to determine whether the copy protection signal is mixed and to perform a switching role.

In addition, the copy protection controller 42 is connected to a rear end of the AGC stage and compares the voltage level output from the AGC stage with the reference voltage of the zener diode 43 to output an active high signal when the reference voltage or more ( 44 and a transistor (Q1) circuit, which is connected to a rear end of the comparator 44 and is turned on by receiving an active high signal of the comparator 44 so as not to record or record an audio signal.

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 unit 40 through the AGC stage.

In particular, the AGC stage automatically adjusts the input signal level when it changes so that the output synchronization level is always constant.

In this case, when the copy protection signal inserted between the received video signal and the video signal is input to the AGC terminal, the corresponding output level signal is output.

In addition, a copy protection control unit 42 is provided between the AGC stage constituting the video signal processing unit 41 and the front end A of the audio signal processing unit 40 to determine whether the copy protection signal is mixed.

At this time, the installation position of the copy protection control section 42 may be set between the AGC stage and the rear end B of the audio signal processing chassis 40.

This is because the role of the copy protection controller 42 is to determine that the copy protection signal is mixed with the output signal of the AGC stage and then switch the audio signal not to be output to the audio head (not shown). .

In order to play this role, the comparator 44 constituting the copy protection controller 42 receives an input voltage of a predetermined voltage or more as a positive input terminal when a copy protection signal is mixed with an output signal of an AGC stage. Comparing with the reference voltage of 43, the input voltage is usually equal to or higher than the reference voltage, and the comparator 44 outputs a high active signal according to this condition.

For reference, a rectifying diode 46 is provided at the rear end of the comparator 44 to perform the rectifying function.

In addition, when a high active signal is output from the comparator 44 and applied to the base terminal of the transistor Q1, the transistor Q1 is turned on and thus the audio transmitted to the front end or the rear end of the audio signal processing Isis unit 40. The signal exits to the ground point, which cuts the output of the audio signal.

Therefore, the recording of the audio signal becomes impossible when the user copies the tape.

For reference, in this case, if only a pure video signal having a constant voltage level (for example, having a voltage less than the zener diode reference voltage) is applied to the (+) input terminal of the comparator 44, The comparator 44 outputs a low signal, which causes the transistor Q1 to be turned off.

Therefore, in this case, the audio signal is normally processed by the audio signal processing unit 40 and then transmitted to the audio head side for copy recording.

The present invention is to automatically output audio when the copy protection signal is mixed with the video output signal of the AGC stage constituting the video signal processing unit 41 to prevent the contents recorded on the image tape from being copied by the general consumer without permission. By interrupting the signal output, it becomes impossible for the user to record the audio signal during tape copying, thereby making it possible to have reliability of copy protection.

Claims (3)

In the VSI system having an audio signal processing eye unit 40 for receiving and processing an audio signal, and a video signal processing eye unit 41 for receiving and processing a video signal, the video signal processing eye unit 41 is provided. Between the AGC stage of the audio signal processing and the front end (A) of the audio unit 40 is characterized in that the copy protection function 42 is provided with a copy protection controller 42 which serves as a switching after determining whether the copy protection signal is mixed or not. Having VSIAL system. 2. The copy protection controller (42) according to claim 1, wherein a copy protection controller (42) is provided between the AGC stage and the rear end (B) of the audio signal processing unit (40) to determine whether or not the copy protection signal is mixed and to perform a switching role. VSI system having a copy protection function. The method of claim 1, wherein the copy protection controller 42 is connected to a rear end of the AGC stage and compares the voltage level output from the AGC stage with a reference voltage of the zener diode 43 to generate an active high signal. And a transistor (Q1) circuit connected to a rear end of the comparator 44 and outputting the active high signal of the comparator 44 so as to be turned on so that an audio signal cannot be recorded or recorded. VSI system with copy protection.