KR0182945B1 - Equipment for recording / reproducing of video - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

A video recording and reproducing apparatus.

2. The technical problem to be solved by the invention

Provides a video recording device for recording a password together with a video signal by using the playback signal recording area of the tape and a video playback device that selectively selects playback in playback of an encrypted video signal. do.

3. Summary of the Solution of the Invention

An image recording and reproducing apparatus for superimposing and recording an encryption signal in a VHS standard video device and selectively reproducing the encrypted signal by the recorded encryption signal, wherein the video recording device corresponds to a control signal generator and an encryption key. A separation unit for sufficiently separating the encryption signal from the control signal band so as to output only the encryption signal, and a synthesis unit for synthesizing the encryption signal from the separation unit and the control signal of the control signal generation unit on the same track. And a recording unit for amplifying and recording the output of the synthesis unit, wherein the image reproducing apparatus includes a control signal reproducing unit for extracting only the control signal for use as a control signal from the recorded image signal, and the recorded image. A detection unit for extracting only the encryption signal from the signal and converting it into an encryption signal at the time of recording to detect the recording password; A playback encryption input section for outputting a playback password by means of an encryption key, a comparison section for generating a comparison signal by comparing the recording password and the playback password, and switching the power of the video playback apparatus based on the comparison signal, The power control unit is configured to allow selective regeneration.

4. Important uses of the invention

In the VHS standard equipment, the user records an arbitrary password superimposed on the area where the control signal is recorded, and if the password recorded on the tape is not input during playback, the playback is impossible.

Description

Video recorder

1 is a diagram showing a tape use area of a general VHS standard.

2 is a diagram showing an image recording apparatus of the present invention.

3 is a diagram illustrating a band distribution diagram of a control signal and an encryption signal according to FIG. 2;

4 is a diagram showing a first embodiment of a video reproducing apparatus of the present invention.

5 is a diagram showing a second embodiment of a video reproducing apparatus of the present invention.

The present invention relates to a video recording and reproducing apparatus, and more particularly, to a video recording and reproducing apparatus for recording a coded signal to a video signal during recording, and selectively selecting and playing the video signal.

In general, a video recording and reproducing apparatus in a video cassette record performs recording and reproducing operations by a power key. Therefore, when power is supplied to the video recording / reproducing apparatus, recording / reproducing operation is always possible. Therefore, the user can easily play the video signal by using the playback key. In this regard, video information that requires confidentiality and video information for adult entertainment, such as children, should be protected. In other words, there is a need to implement a system that is playable only to a specific person.

It is therefore an object of the present invention to provide a video recording apparatus for recording a password together with a video signal using a playback signal recording area of a tape.

Another object of the present invention is to provide an image reproducing apparatus which selectively selects reproduction in reproduction of an encrypted video signal so that the reproduction or reproduction is impossible.

In order to achieve the objects of the present invention, a video recording and playback apparatus for recording a superimposed code signal in a VHS standard video apparatus and selectively reproducing the recorded video signal, wherein the video recording apparatus comprises a control signal. A separation unit for generating the encryption signal corresponding to the encryption key and the encryption signal corresponding to the encryption key enough to output only the encryption signal, and the encryption signal from the separation unit and the control signal of the control signal generator is the same track And a recording unit for amplifying and recording the output of the synthesis unit, wherein the image reproducing apparatus is configured to extract only the control signal from the recorded image signal for use as a control signal. A signal reproducing unit and extracts only an encryption signal from the recorded video signal and converts it into an encryption signal A detection unit for detecting a recording password, a reproduction encryption input unit for outputting a reproduction password by the encryption key during reproduction, a comparison unit for comparing the recording password and the reproduction password to generate a comparison signal, and based on the comparison signal It is characterized in that the power control unit for switching the power of the video playback device, thereby enabling selective playback.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that like elements in the figures represent like reference numerals wherever possible.

FIG. 1 is a diagram showing a tape usage area of a general VHS standard. Hereinafter, a description will be given with reference to FIG. 1.

The tape usage area of the general VHS (Video Homes System) standard is largely divided into an audio signal recording area, a video signal recording area, and a control signal recording area. The lowest recording density of the three areas is the control signal recording area. And since the control signal is a very low frequency of 30Hz, the high frequency band is empty. Accordingly, different signals can be simultaneously recorded by band synthesis using the control signal recording area, and different signals can be separately reproduced by simple band separation even during reproduction. Accordingly, the area recording and reproducing apparatus of the present invention can record an encryption signal enabling selective reproduction without assigning a separate channel based on this principle. Therefore, the video recording and reproducing apparatus of the present invention is compatible with the VHS standard.

The block diagram of the video recording apparatus of the present invention is shown in FIG. Referring to FIG. 2, the image recording apparatus generates a control signal for generating and outputting control signals of a video device and converting them into signals for recording, and generating an encryption signal when an encryption key is input by a user. A recording password input section 212, a recording converting section 213 for converting the encryption signal into a high level band with the control signal band so as to be sufficiently separated from the control signal band, and only a high level band to output only the encryption signal. A synthesizer 215 for synthesizing the band pass filter 214 to pass through, the encryption signal of the band pass filter 214 and the control signal of the control signal generator 211 on the same track, and amplifying the output of the combiner 215. A recording amplifier 216 and a head 217 for recording the output of the recording amplifier 216.

Referring to the configuration of FIG. 2, the recording password input unit 212 performs a function of inputting a password number when a user wants to prevent the other person from playing by inputting an encryption key of a desired tape. The code number is inputted to the recording conversion section 213 to convert the band 30Hz, which is sufficiently low from the control signal band. In this case, the band of the encryption signal converted to 5000 Hz is shown in FIG. 3. Therefore, a sufficient distance from the control signal is spaced apart so as not to disturb the recording of the control signal. The band pass filter 214 which passes only the band of the encrypted signal converted to 5000 Hz outputs only the encrypted signal. The synthesizer 215 simply band-synthesizes the converted encryption signal and the control signal and outputs them to the recording amplifier 216. The recording amplifier 216 supplies a current for the head to sufficiently record the synthesized signal of the combiner 215 on the magnetic tape. Accordingly, the head 217 converts the electric signal input from the recording amplifier 216 into a magnetic signal and records the magnetic signal on the magnetic tape.

That is, the video recording apparatus of the present invention superimposes and records the encryption signal in the area for recording the control signal.

3 is a distribution diagram of band combining the band of the control signal and the band of the encryption signal according to FIG.

4 is a diagram showing the first embodiment of the video reproducing apparatus of the present invention. A description with reference to FIG. 4 is as follows.

The video reproducing apparatus includes a low pass filter, and a control signal reproducing unit 412 for filtering only the control signal for use as a control signal in the recorded video signal, and a band pass having the same characteristics as that of the band pass filter of the video recording apparatus. And a band pass filter 214 for filtering only a coded signal from the recorded image signal, and having a function opposite to that of the recording converter 213 of the image recording device, and outputting the band pass filter 214. A reproduction conversion unit 414 for converting a recording password signal into a recording password signal at the time of recording and outputting a recording password, and a reproducing encryption input unit 415 for outputting a reproduction password by means of an encryption key by a user during reproduction; A comparison unit 416 for comparing a reproduction code to generate a comparison signal, and switching the power of the video reproducing apparatus based on the comparison signal; , It constitutes a power control unit 417 that this is to be selectively reproduced.

Referring to the configuration of FIG. 4, the head 217 is used for both recording and reproducing, and during reproducing, the magnetic signal is read from the magnetic tape, converted into an electrical signal, and output to the reproduction amplifier 411. The regeneration amplifier 411 amplifies the weak input signal into a sufficiently large signal and outputs it to the control signal regeneration unit 412 and the band pass filter 214. The control signal reproducing unit 412 extracts only a low band control signal using a low pass filter to use as a control signal. In addition, the band pass filter 214 passes only the encryption signal having a higher level than the control signal and outputs it to the reproduction converter 414. The reproduction converting section 414 converts the recording code signal to a comparator 416. The comparator 416 generates a comparison signal that allows the selective playback by comparing the playback password with the recording password. If there is no recording password, the control unit 417 controls the power control unit 417 to enable playback regardless of the playback password. In the case of the reproduction password, the power control unit 417 is controlled to be reproducible, and if there is a recording password, a comparison signal is outputted so that reproduction is impossible when the recording password is different from the recording password. The power controller 417 switches the power applied to the image reproducing apparatus by using the output of the comparator 416 to stop the reproducing operation and the reproducing operation. This is summarized in Table 1 below.

Another embodiment of a video reproducing apparatus of the present invention is shown in FIG. Hereinafter, a description will be given with reference to FIG. 5.

The image reproducing apparatus has a low pass filter, and has the same characteristics as the control signal reproducing unit 412 for filtering only the control signal to use as a control signal in the recorded image signal, and the band pass filter 214 of the image recording apparatus. A band pass filter 214 for filtering only an encryption signal from the recorded video signal, a record encryption detector 511 for inputting the output of the band pass filter 214 to determine whether or not there is a record password, and reading and storing the encryption key in advance And a reproduction encryption reader 512 for generating a reproduction password when the same encryption signal is the same as the promised encryption signal, a comparison unit 513 for generating a comparison signal by comparing the output of the reproduction password and the recording encryption detection unit 511, and the comparison signal. The power control unit 417 is inputted.

Referring to FIG. 5, in order to implement FIG. 5, the encryption signal by the encryption key in the video recording apparatus is a constant signal. Therefore, there is only one encryption signal, which is stored in the reproduction password reading unit 512. The head 217, the regenerative amplifier 411, and the control signal generator 412 perform the same operations as the components of FIG. 4. Therefore, the description thereof will be omitted. Therefore, the description thereof will be omitted. The band pass filter 214 extracts only the recording code signal from the combined signal of the input control signal and the recording code signal. The recording password detecting unit 511 determines whether or not the recording password exists by using an integrating circuit. When a write signal is present, a low level, which is a logic level, is output. The reproduction password reading unit 512 reads a signal input from the encryption key and outputs a high level, which is a reproduction password, to the comparison unit 513 implemented as a negative logic when it is identical to the previously stored encryption signal. The comparator 513 outputs a high level only when the signal output from the recording password detection unit 511 is at a low level that is a signal having a recording password and when the signal output from the reproduction password reading unit 512 is a high level that is a reproduction password. . The power controller 417 inputs the high level to perform a regeneration operation. This is summarized in Table 2 below.

In Table 2, in case 2 and case 4, since the output level of the recording password detection unit 511 is high level, no encryption signal is recorded on the tape. Accordingly, the playback operation is performed regardless of the encryption signal input during playback by the user. Also, in case 1, the user knows the password recorded on the tape, the playback operation is performed. This is because the output level of the reproduction password reading unit 512 is high level. In addition, since the user does not know the password recorded on the tape, the power supply controller 417 inputs the high level in the comparator 513 realized by the negative logic, so that the power is cut off so that playback is impossible.

As described above, the inherent password is recorded on the recording tape keeping the security, so that the playback is impossible if the recording password is not inputted at the time of playback, so that the playback can be selectively performed.

Claims (5)

A video recording and reproducing apparatus for superimposing and recording an encryption signal in a VHS standard video device, and selectively reproducing the recorded video signal by the recorded encryption signal, wherein the video recording device corresponds to a control signal generating means and an encryption key. A separation means for sufficiently separating the encryption signal from the control signal band so as to output only the encryption signal, and combining the encryption signal from the separation means and the control signal of the control signal generating means to be recorded on the same track. Means, and recording means for amplifying and recording the output of the synthesizing means, wherein the video reproducing apparatus includes: control signal reproducing means for extracting only the control signal for use as a control signal from the recorded video signal; Extracting only an encryption signal from the video signal and converting it into an encryption signal at the time of recording to detect the recording password Detection means, reproduction encryption input means for outputting a reproduction password by the encryption key during reproduction, comparison means for generating a comparison signal by comparing the recording password and the reproduction password, and the image based on the comparison signal. And a power control means for switching a power supply of the playback device and enabling selective playback thereof. The video reproducing and recording device according to claim 1, wherein a band of said encryption signal is at a higher level than a band of said reproduction signal. 2. The apparatus of claim 1, wherein the separation means comprises: recording conversion means for converting the encryption signal so as to be isolated from the band of the reproduction signal, and a band for passing only the band of the converted encryption signal which is an output of the recording conversion means. An image recording and reproducing apparatus, characterized in that configured as a pass filter. An image recording and reproducing apparatus for superimposing and recording an encryption signal in a VHS standard video device and selectively reproducing the encrypted signal by the recorded encryption signal, wherein the video recording device is configured to input a control signal generating means and an encryption key. An encryption signal input means for recording, recording conversion means for sufficiently isolating the encryption signal corresponding to the encryption key to a level higher than the control signal band level, a band pass filter for filtering only the encryption signal; And synthesizing means for synthesizing the encryption signal from the band pass filter and the control signal of the control signal generating means on the same track, and recording means for amplifying and recording the output of the synthesizing means. The apparatus includes a low pass filter, the first signal for use as a control signal in the recorded video signal. A control signal reproducing means for filtering only a fish signal, a band pass filter for filtering only a cryptographic signal in the recorded video signal, and a function opposite to that of the recording conversion means; Reproducing conversion means for inputting the output of the band pass filter, converting it into a recording encryption signal at the time of recording, and outputting a recording password, reproducing encryption input means for outputting a reproduction password by the encryption key during reproduction, and the recording An image comprising a comparison means for generating a comparison signal by comparing an encryption code and the reproduction password, and a power control means for switching the power of the image reproducing apparatus based on the comparison means, thereby enabling selective reproduction. Record and playback device. 5. The video reproducing apparatus according to claim 4, wherein said video reproducing apparatus comprises: said recording signal detecting means for inputting said control signal reproducing means, said band pass filter, and output of said band pass filter to determine whether or not a recording password is present; A reproduction password reading means for reading a key and generating a reproduction password when the same encryption signal is stored in advance as a promised encryption signal, and comparing means for comparing the output of the reproduction password and the recording encryption detection means to generate a comparison signal; And the power control means for inputting the comparison signal.