JPH0670282A - Video signal recording and reproducing device - Google Patents

Abstract

PURPOSE:To provide a video signal recording and reproducing device capable of prohibiting copying between equipments and limiting the number of the times of the copying in a digital video recorder provided with analog video signal input/output, etc. CONSTITUTION:Video signals inputted to a video signal input terminal 1 detect the superimposed copy information of one horizontal section of a vertical deletion section at a detection circuit 3, send the information to a recording discrimination circuit 4 and send an instruction whether to make the recording available or not to a video signal recording circuit 2. When the recording is available, the number of the times of the copying indicated from the B2 to the B4 of a figure 2(a) is increased by one at the time of the recording and the recording is performed to a magnetic tape 6 at a recording magnetic head 5. At the time of reproduction, regenerative signals reproduced from a reproducing magnetic head 7 are inputted to a video signal reproducing circuit 8 and the copy information on the magnetic tape 6 is detected by the detection circuit 9, superimposed on output from the video signal reproducing circuit 8 by an adder 10 and outputted to a video signal output terminal 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal recording / reproducing apparatus capable of prohibiting copying between devices and limiting the number of copying in a digital video tape recorder having an analog video signal input / output.

[0002]

2. Description of the Related Art In recent years, video tape recorders have been widely used in general households, and the reason for this popularization is that they contribute to the enhancement of soft tapes for movies and the like. from now on,
In a home digital tape recorder, copying between devices is prohibited not only for digital input / output but also analog input / output from the viewpoint of copyright protection of soft tape.
There is a growing need for systems that can limit the number of copies.

Conventionally, there are analog input / output prohibiting copying, but there is no information relating to analog input / output copying of a digital video tape recorder.

[0004]

Conventionally, it is not possible to cope with a use in which the number of times of copying is limited such that copying can be performed several times only by prohibiting copying by analog input / output.
In a digital video tape recorder, even if copying is prohibited or the number of times of copying is restricted by inputting / outputting a digital video signal, even if copying by an analog video signal causes little deterioration, it is necessary to consider copying in analog video signal input / output. Is insufficient.

The present invention solves the above-mentioned problems.
It is an object of the present invention to provide a video signal recording / reproducing apparatus capable of prohibiting copying between devices or limiting the number of copying, such as a digital video tape recorder having an analog video signal input / output.

[0006]

In order to solve the above-mentioned problems, according to the present invention, means for detecting the information of copyable or prohibited and the information of the number of times of copying with respect to the input signal of the video signal, and whether or not recording is possible based on the detection result. And a means for detecting the copyable or prohibited information and the copy count information on the recording medium at the time of reproduction, and superimposing the copyable or prohibited information and the copy count information on the video signal output. ing.

[0007]

With the above structure, it is possible to prohibit recording by detecting the prohibition of copying of the input video signal and the number of times of copying. In addition, when recording is possible, the number of copies can be managed by increasing the copy count information on the recording medium by 1 at the time of recording, and at the time of reproduction, the copyable or prohibited information on the recording medium and the number of copies are recorded. By detecting and superimposing such information on the video signal output, analog input / output can perform copy management similar to digital input / output.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the system configuration of a video signal recording / reproducing apparatus according to the first embodiment of the present invention. In FIG. 1, 1 is a video signal input terminal, 2
Is a video signal recording circuit, 3 is a detection circuit, and 4 is a recording determination circuit. Reference numeral 5 is a recording magnetic head, 6 is a magnetic tape, and 7 is a reproducing magnetic head. Reference numeral 8 is a video signal reproduction circuit, 9 is a detection circuit, 10 is an addition circuit, and 11 is a video signal output circuit.

FIG. 2 is a diagram showing a state in which information indicating whether copying is possible or prohibited and information indicating the number of times of copying are superimposed in one horizontal period within the vertical erasing period of the video signal.

First, it is assumed that the video signal input to the video signal input terminal 1 has the information of copy permitted or prohibited and the information of the number of times of copying, as shown in FIG. 2A. In FIG. 2A, B1 to B4 indicate the positions where the copyable / prohibited information and the copy count information are inserted, and are represented by binary values at the video signal level. That is, the black level of the video level is 0 and the white level is 1. In FIG. 2A, when B1 is 0, copying is possible, when 1 is copying prohibited, and in B2, B3, and B4, the number of times of copying is represented by a binary number with B2 as an upper bit.
In FIG. 2B, B1 is 1, that is, copy is prohibited, and B2,
The case where B3 and B4 are 011 is shown, and the example in which the number of copies is 3 is shown.

In the video signal input to the video signal input terminal 1 of FIG. 1, the detection circuit 3 detects the copy information on which one horizontal section of the vertical erasing section is superimposed, and sends this information to the recording determination circuit 4. , And sends a command to the video signal recording circuit 2 to enable or disable recording. When recording is possible, the number of copies represented by B2 to B4 in FIG. 2A is increased by 1 at the time of recording, and recording is performed on the magnetic tape 6 by the recording magnetic head 5.

At the time of reproduction, the reproduction signal reproduced from the reproduction magnetic head 7 is input to the video signal reproduction circuit 8, the copy information on the magnetic tape 6 is detected by the detection circuit 9, and the reproduction information from the video signal reproduction circuit 8 is detected. The output and the adder 10 superimpose and output to the video signal output terminal 11.

When the judgment circuit 3 sets the command of the recording judgment circuit 4 to be unrecordable when B1 of the copy information is 1 and the number of copies of B2 to B4 is 3 or more, the first magnetic tape The copy information of 6 is B1 is 1, B2
If the number of copies indicated by B4 to B4 is 0, B1 maintains the state of 1 for each copy, but the number of copies indicated by B2 to B4 increases by 1 and becomes 3; When is repeated three times, the next recording becomes impossible. When the number B1 of the first magnetic tape 6 is 1, and the number of copies indicated by B2 to B4 is 2, only one copy is possible, and when the number of copies B1 is 1, and the number of copies indicated by B2 to B4 is 3. Is prohibited. In this way, by setting the copy information of the first magnetic tape, that is, the supplied soft tape, it is possible to freely set the number of copies and the prohibition of copying.

As described above, according to the present embodiment, means for detecting the information of the copyable or forbidden and the information of the number of times of copying with respect to the input signal of the video signal, and means for determining whether or not recording is possible based on the detection result. At the time of playback, it detects the information that can be copied or prohibited on the recording medium and the information on the number of times of copying,
Providing a means for superimposing the information of the number of copies and the information about the number of copies that can be copied or prohibited on the video signal output, prohibits copying between devices or limits the number of copies in a digital video tape recorder or the like having analog video signal input / output. be able to.

A second embodiment of the present invention will be described below with reference to the drawings. The block diagram showing the system configuration is the same as that of FIG. 1 used in the description of the first embodiment. FIG. 3 is a diagram showing a state in which the copy prohibition signal and the information on the number of copies are superimposed in each horizontal period within the vertical erasing period of the video signal. 2 is different from FIG. 2 in that the copyable or prohibited information is indicated by B1 in FIG. 2A, but in FIG. 3, instead of this, when the copy is prohibited, the signal of FIG. Is used and is not used when copying is possible. Therefore, as shown in FIG. 3B, the copy number information is changed from B2 to B4 that does not include the copyable or prohibited information corresponding to B1 in FIG. 1A in one horizontal period.

The operation of the video signal recording / reproducing apparatus configured as described above will be described below. Regarding the operation, in the case of copy prohibition, the signal of FIG. 3A is superimposed in a horizontal period different from that of FIG. 3B in which the information on the number of copies is superimposed. If copying is possible, there is no need to superimpose any signal.

First, it is assumed that the video signal input to the video signal input terminal 1 of FIG. 1 is superimposed on one or more horizontal periods within the vertical erasing period as shown in FIG. 3 (a). Figure 3
In (b), B2 to B4 indicate the positions where the information on the number of times of copying is inserted, and are represented in binary at the video signal level. That is, the black level of the video level is 0,
Set the white level to 1. In addition, B2, B3 of FIG.
The number of copies is represented by B4 by a binary number with B2 as the upper bit. When the signals shown in FIGS. 3A and 3C are included in the vertical erase period, copying is prohibited and the number of times of copying is 3.

The video signal input to the video signal input terminal 1 of FIG. 1 is detected by the detection circuit 3 for the presence or absence of the signal of FIG. 3 (a) in which the horizontal section of the vertical erasing section is superposed, and the recording determination circuit. 4 and sends a command to the video signal recording circuit 2 to enable or disable recording. When recording is possible, the number of copies represented by B2 to B4 in FIG. 2A is increased by 1 at the time of recording, and recording is performed on the magnetic tape 6 by the recording magnetic head 5.

At the time of reproduction, the reproduction signal reproduced from the reproduction magnetic head 7 is input to the video signal reproduction circuit 8, the copy information on the magnetic tape 6 is detected by the detection circuit 9, and the reproduction information from the video signal reproduction circuit 8 is detected. The output and the adder 10 superimpose and output to the video signal output terminal 11.

Here, if the judgment circuit 3 has the signal of FIG. 3A and the number of times of copying of B2 to B4 of FIG. 3B is 3 or more, the command of the recording judgment circuit 4 becomes unrecordable. If the copy information of the first magnetic tape 6 is prohibited and the number of copies is 0 when the setting is set, the signal of FIG. 3A is maintained, but the number of copies of B2 to B4 is
When it increases by 1 and becomes 3, that is, when the copying is repeated 3 times, the next recording becomes impossible. When the copy information of the first magnetic tape 6 is prohibited and the number of copies is 2, only one copy is possible, and when the copy information of the magnetic tape 6 is prohibited and the number of copies is 3, the copy is prohibited. Become. In this way, by setting the copy information of the first magnetic tape, that is, the supplied soft tape, it is possible to freely set the number of copies and the prohibition of copying.

When copy is prohibited, the signal shown in FIG. 3 (a) is output. Therefore, even if an attempt is made to copy to a conventional analog video tape recorder, the automatic gain control circuit and the sync separation circuit malfunction and normal recording cannot be performed. That is, not only copy management between digital tape recorders but also copy prohibition can be realized for analog video tape recorders.

As described above, according to this embodiment, there are provided means for detecting the information of copyable or prohibited and the information of the number of times of copying with respect to the input signal of the video signal, and means for determining whether or not recording is possible based on the detection result. At the time of playback, it detects the information that can be copied or prohibited on the recording medium and the information on the number of times of copying,
Providing a means for superimposing the information of the number of copies and the information about the number of copies that can be copied or prohibited on the video signal output, prohibits copying between devices or limits the number of copies in a digital video tape recorder or the like having analog video signal input / output. be able to. Further, in the present embodiment, in the case of copy prohibition, the signal of FIG. 3A is used, so that the copy prohibition can be realized by causing the conventional analog video tape recorder to malfunction.

In the first and second embodiments, B
Although the number of bits of the number of copies shown from 2 to B4 is 3 bits, it goes without saying that any number of bits may be used.
In addition, since the number of times of copying is three in the embodiment, the bit of B2 in FIG. 2 is actually redundant, but there is no other meaning.

[0024]

As described above, according to the present invention, the first detecting means for detecting the copyable / prohibited information and the copy number information from the video input signal, and the recording result is determined by the detection result. A determination means, a video signal recording means for superimposing the determination result on a video signal and recording the signal on a recording medium, a video signal reproducing means for reproducing the signal recorded on the recording medium, and a video signal reproducing means. Second detection means for detecting the copyable / prohibited information and the copy count information from the output, and the superposition for superimposing the copyable / prohibited information and the copy count information obtained by the second detection means on the video signal. Means for prohibiting copying between devices and limiting the number of copying in a digital video tape recorder having an analog video signal input / output. Superior video signal recording and reproducing apparatus can to be able to realize.

[Brief description of drawings]

FIG. 1 is a block diagram showing a system configuration of a video signal recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram showing a state in which information on whether copying is possible or prohibited and information on the number of copies are superimposed in one horizontal period within a vertical erasing period of a video signal in the first embodiment of the present invention.

FIG. 3 is a diagram showing a state in which copy prohibition information and copy number information are superimposed in each horizontal period within a vertical erasing period of a video signal in the second embodiment of the present invention.

[Explanation of symbols]

 1 video signal input terminal 2 video signal recording circuit 3 detection circuit 4 recording determination circuit 5 recording magnetic head 6 magnetic tape 7 reproducing magnetic head 8 video signal reproducing circuit 9 detection circuit 10 adder circuit 11 video signal output terminal

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Chiyoko Matsumi 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (4)

[Claims] 1. A video signal recording / reproducing apparatus provided with an input / output device in which information on whether copying between devices is possible or prohibited and information on the number of times of copying are superimposed on a video signal. 2. A video signal recording apparatus comprising: a detection means for detecting information on whether copying is possible or prohibited and information on the number of times of copying from a video input signal; and a judgment means for judging whether or not recording is possible based on the detection result. 3. A video provided with a superimposing means for detecting copyable / prohibited information and copy count information on a recording medium during reproduction and superimposing the copyable / prohibited information and the copy count information on a video signal output. Signal reproduction device. 4. A first detecting means for detecting information on whether copying is possible or prohibited and information on the number of times of copying from a video input signal, a judging means for judging whether or not recording is possible based on the detection result, and the judgment result for the video signal. Video signal recording means for superimposing this signal on a recording medium and recording the signal on a recording medium, video signal reproducing means for reproducing the signal recorded on the recording medium, and copyable or prohibited information and copy from the output of the video signal reproducing means. A video signal reproducing apparatus comprising: a second detecting means for detecting information on the number of times; and a superimposing means for superimposing information on the copy availability or prohibition obtained by the second detecting means and information on the number of times of copying on a video signal.