JP3036013B2 - Recording / reproducing device, recording device and reproducing device - Google Patents

Description

The present invention relates to a recording / reproducing apparatus having a scrambling function.

[Summary of the Invention] The present invention is a system that records a scrambled video signal and a recognition code, and descrambles the reproduced video signal only when the reproduced recognition code matches a unique recognition code. Thus, compatibility can be limited even between the same models.

2. Description of the Related Art Some VTRs (video tape recorders), which are recording / reproducing apparatuses, have a scramble function for performing recording processing so that they cannot be reproduced by ordinary apparatuses. In the conventional scramble function, an encoder is provided in a recording system circuit, and a video signal is subjected to special signal processing that is different from normal processing and recorded by the encoder. Then, it is configured such that reproduction cannot be performed unless the device has a special decoder in the reproduction system circuit.

[Problem to be Solved by the Invention] However, in the above configuration, since the same model is equipped with the same encoder and decoder, scrambling is performed between different models, but scrambling is not performed between the same models. there were. If there is always compatibility between the same models, inconvenience may occur in terms of confidentiality.

Therefore, an object of the present invention is to provide a recording / reproducing apparatus or the like that can limit compatibility even between the same models.

[Means for Solving the Problems] According to a first aspect of the present invention, there is provided a recording / reproducing apparatus comprising: a recording medium on which a video signal is sequentially recorded in a track shape; and a recording medium on a track of the recording medium. A signal generation circuit that generates a head tracking signal to be generated, a scramble processing circuit that scrambles the tracking signal, an ID code generation circuit that generates a unique recognition code, and a tracking signal scrambled by the scramble processing circuit. The identification code of the ID code generation circuit is recorded on a recording medium, and the descrambling processing circuit that descrambles the tracking signal matches a reproduction recognition code based on the generated recognition code with a unique recognition code. An ID detection circuit for detecting whether or not the reproduction recognition code is unique to the reproduction detection code. A tracking signal in the descrambling circuit only when it is determined that the recognition codes match with descrambling process is to reproduce the video signal.

A recording apparatus according to a second aspect of the present invention includes a recording medium on which a video signal is continuously recorded in a track shape, a signal generation circuit for generating a head tracking signal recorded on a track of the recording medium, It has a scramble processing circuit for scramble processing and an ID code generation circuit for generating a unique recognition code, and records the tracking signal scrambled by the scramble processing circuit and the recognition code of the ID code generation circuit on a recording medium. Is what you do.

A reproducing apparatus according to a third aspect of the present invention is a reproducing apparatus for reproducing a recording medium on which a scrambled tracking signal, an identification code of an ID code generation circuit, and a video signal are recorded, wherein the tracking signal is descrambled. A scramble processing circuit, and an ID detection circuit for detecting whether or not a reproduction recognition code based on the recognition code of the ID code generation circuit matches a unique recognition code;
Only when the ID detection circuit determines that the reproduction recognition code matches the unique recognition code, the descrambling processing circuit descrambles the tracking signal and reproduces the video signal.

[Operation] The tracking signal subjected to the scramble processing and the unique recognition code are recorded, and if the reproduction recognition code does not match the unique recognition code, the reproduction is not performed, so that the compatibility can be limited even between the same models.

[Example] Hereinafter, an example of the present invention will be described.

1 and 2 show a first embodiment of the present invention.

FIG. 1 shows a circuit block diagram during recording.
In FIG. 1, a scramble processing circuit 1 encodes a video signal according to a predetermined rule and outputs the encoded video signal to an adder 2. The ID generation circuit 3 outputs a unique recognition code to the adder 2 every time the vertical synchronization signal is input. The adder 2 adds the video signal and the recognition code, and the added signal is guided to the head H. The head H scans the tape 4 to record a signal, and the recognition code is recorded in, for example, a VITC data area.

FIG. 2 shows a circuit block diagram during reproduction.
In FIG. 2, the reproduction output of the head H is supplied to a first switch SW.
₁ and the ID detection circuit 5. Descramble circuit 6 by way of decoding according to promise a video signal of a constant, the first switch SW ₁ to the input side of the descramble circuit 6, a second switch SW ₂ is provided on the output side. Or the first switch SW ₁ and the second switch SW ₂ or directing backward reproduction output of the head H through the descrambling circuit 6 (a terminal position) leads to the rear without passing through the descrambling circuit 6 (b terminals position) intended to select, the first switch SW ₁ and the second switch SW ₂ is switched by the switching signal ID detecting circuit 5. The ID detection circuit 5 extracts the reproduction recognition code and determines whether or not the reproduction recognition code matches the unique recognition code. Specific recognition code is previously set, the apparatus is a specific or certain relevant device common code, the first switch SW ₁ and the second switch SW ₂ is a terminal position if both the codes match If they do not coincide with each other, a switching signal is output to position the terminal b.

 Hereinafter, the operation of the above configuration will be described.

In FIG. 1, a video signal is a scramble processing circuit 1.
The scrambled video signal is added with a unique recognition code of the ID detection circuit 3 and recorded on the tape 4. Therefore, even if the tape 4 is to be reproduced by a different type of model, it cannot be reproduced because the video signal is scrambled. Also, the tape 4
Is reproduced by the same model and with a device having a different recognition code, the reproduction is impossible as described below, and there is no compatibility.

In FIG. 2, the reproduction output of the head H is
When the reproduction recognition code and the unique recognition code do not match, the signal is sent to the subsequent circuit without passing through the descrambling processing circuit 6, and when the reproduction recognition code and the unique recognition code match, the data is sent to the descrambling processing circuit 6. The data is descrambled and sent to the subsequent circuit. Therefore,
Tape 4 recorded by different models without scrambling
Can be reproduced because it does not pass through the descramble processing circuit 6. However, it is impossible to play back the tape 4 recorded by a different type of scrambled device or the tape 4 recorded by a device having a unique identification code even if the same type is used.
Only tapes 4 of the same model and having the unique recognition code recorded by the same device can be reproduced. That is, in the case of the same model, compatibility is maintained only for devices having the same recognition code.

FIGS. 3 to 7C show a second embodiment of the present invention.

FIG. 3 shows a circuit block diagram at the time of recording.
In FIG. 3, the heads H _A ,
H _B is fixed, the respective heads H _A, H _B have different azimuth angles from each other, one of the head H _A is other head H _B in A azimuth angle is configured to B azimuth angle. Is configured to azimuth recording the two heads H _A, is H _B scans the upper tape 4 alternately. The switching pulse switches between H level and L level based on the rotational position of the drum 11. That is, one of the heads H _A is at H level during a tape scan the other head H _B is at the L level during a tape scan,
This switching pulse is guided to the microcomputer 13.
The microcomputer 13 starts from "00" based on the switching pulse.
The 2-bit signal “11” is output to pilot signal generator 14. In the normal mode in which no scramble mode signal is input, a signal of “00” or “10” is output when the switching pulse is at the H level, and every time the level is switched, “00” → “01” → “10” → “11” Is switched in the order of ", and this is repeated. When the switching pulse is at the H level in the scramble mode, "01" or "11"
And the output is repeated in the above order each time the level is switched. The scramble mode is configured to be selectable by a scramble mode selection button (not shown). The pilot signal generator 14 outputs a pilot signal based on the input signal, and when the input signal is “00”, f ₁ , “0”
When 1 "f _2, f ₃ when the" 10 ", and outputs the pilot signal f ₄ at" 11 ". Thus, the head H _A, the pilot signal recorded with H _B is a relationship as shown in Figure 5.
Each pilot signal has a low frequency of 100 to 170 KHz without azimuth loss, and this pilot signal is guided to an adder 16 via a low-pass filter (LPF) 15. Microcomputer 1
3. The pilot signal generator 14 and the low-pass filter 15 change the relationship between the recording azimuth state and the pilot signal depending on whether the scramble mode is selected, and are configured as a scramble processing circuit A. When the scramble mode signal is input, the ID generation circuit 17 outputs a unique recognition code to the adder 16 every time a vertical synchronization signal in the video signal is detected. The video signal and the audio signal are guided to the adder 16, where a pilot signal and a unique recognition code are added to these signals. The adder 16 outputs selectively the heads H _A through the changeover switch SW, is guided to H _B. A switching pulse is guided to the changeover switch SW, and is switched to the heads H _A and H _B during tape scanning based on the switching pulse.

FIG. 4 shows a circuit block diagram during reproduction.
In Figure 4, two heads H _A, the output of the H _B is guided to selectively balanced modulation circuit 18 and the signal processing circuit via the switch SW _2. The signal processing circuit performs predetermined processing on the video signal and the audio signal. The balanced modulator circuit 18 is input the reference pilot signal f ₁ ~f _4, to balance modulates the reproduced pilot signal and the reference pilot signal. This output is sent to a 16 KHz bandpass filter 19 a and a 46 KHz bandpass filter 19 b, respectively, and the outputs of both bandpass filters 19 a and 19 b are input to the operational amplifier 20. The output of the operational amplifier 20 is sent to the adder 21 as phase error data, where it is added to the speed error signal and sent to the drive circuit 22. The drive circuit 22 outputs a drive signal to a capstan motor (not shown) based on the error signal, and the heads H _A and H _B are controlled for auto tracking. on the other hand,
The switching pulse switches between H level and L level based on the rotational position of the drum 11 in the same manner as described above.
H _A is H level during tape scan, during tape scan other head H _B is at the L level, the switching pulse is directed to the microcomputer 23. ID detection circuit 26 has a head
The playback outputs of H _A and H _B are input, and it is detected whether or not the playback recognition code and the unique recognition code match, and this detection signal is sent to the microcomputer 23. The microcomputer 23 outputs 2-bit signals “00” to “11” to the pilot signal generator 24 based on the switching pulse. In the normal mode in which the scramble mode signal is not input, a signal of “00” or “10” is output when the switching pulse is at the H level,
Every time the level switches, "00" → "01" → "10" → "11"
The output is switched in the order described above and this is repeated. Also, in the scramble mode and when a detection signal indicating a code match is input by the ID detection circuit 26, a signal of "01" or "11" is output when the switching pulse is at the H level, and the above-described signal is output each time the level is switched. Repeat the output in order. However, when a detection signal indicating code mismatch is input from the ID detection circuit 26 in the scramble mode, a signal similar to that in the normal mode is output. The scramble mode is configured to be selectable by a scramble mode selection button (not shown). The pilot signal generator 24 outputs a pilot signal based on the input signal, and when the input signal is “00”, f ₁ ,
F ₂ when "01", f ₃ when the "10", and outputs the reference pilot signal f ₄ at "11". This reference pilot signal is output to the balanced modulation circuit 18 via the low-pass filter 25. The microcomputer 23, a pilot signal generator 24 and a low-pass filter 25 is configured as a descrambling circuit B in which the variable head H _A, and H _B the relation of the reproduction track by whether scramble mode is selected.

 Hereinafter, the operation of the above configuration will be described.

In FIG. 3, when the normal mode is selected and recorded, the pilot signal generator 24 outputs the H level of the switching pulse.
Level f ₁ (or f ₃ pilot signal) at L level
To output the pilot signal of f ₂ (or f ₄ ), the pilot signal of f ₁ or f ₃ in A azimuth and the pilot signal of f ₂ or f _{4 in} B azimuth as shown in FIG. Is recorded. When reproducing the tape 4 which has been recorded in the normal mode in the normal mode, Figure 7 reproduced pilot signal as shown in (a) of one track is f ₁ or f ₃ head H _A is, f ₂ or track and head for a f a ₄ tracks other head H _B scans
H _A and H _B have the same azimuth, and the video signal and the audio signal are reproduced.

In FIG. 4, when the scramble mode is selected and recorded, the pilot signal generator 24 outputs the pilot signal of f ₂ (or f ₄ ) at the H level of the switching pulse.
To output the pilot signal f ₁ (or f ₃₎ at the L level, f ₂ at A azimuth as shown in FIG. 6 (b)
Or pilot signals f ₄ is a unique identification code with the pilot signal f ₁ or f ₃ in B azimuth is recorded is recorded. When reproducing the tape 4 which has been recorded in the scramble mode in the normal mode, Figure 7 reproduced pilot signal as shown in (b) of one track is f ₁ or f ₃ head H _A is, f ₂ or track and head for a f a ₄ tracks other head H _B scans
H _A and H _B become reverse azimuths and the video signal and the audio signal are not reproduced. Therefore, the tape 4 recorded in the scramble mode cannot be reproduced by different types of models. When reproducing the tape 4 which has been recorded in scrambled mode scrambling mode, the reproduction pilot signal f ₁ or f ₃ as shown in FIG. 7 (b) in the same manner as described above when the reproducing identification code and a unique identification code do not match one of the heads H _a certain track, the track and the head H _a for the track is f _2, or f ₄ is other head H _B scans, and a H _B is irreproducible is reverse azimuth. On the other hand, one of the heads H _A track reproduction pilot signal is f ₂ or f ₄ as shown in Figure a. 7 (c) when the reproduction identification code and a unique identification code to match, at f ₁ or f ₃ One track to the other head H _B
There track and head H _A for scanning, and a H _B is reproduced is the same azimuth. Therefore, even if the tape is the same model, the tape 4 recorded by the device with the unique recognition code cannot be reproduced, and only the tape 4 of the same model and recorded with the same device with the unique recognition code can be reproduced. . That is, in the case of the same model, when the scramble mode is selected, compatibility is maintained only for devices having the same recognition code.

Although the tracking pilot signal is used as the phase servo signal in the second embodiment, a CTL signal having an H level and an L level may be used. In the second embodiment, the scramble selection button is provided to select whether or not to reproduce in the scramble mode. However, a determination circuit may be provided to enable automatic determination.

[Effects of the Invention] As described above, according to the first aspect of the invention, a recording medium on which a video signal is continuously recorded in a track shape and a head tracking signal recorded on a track of the recording medium are generated. A signal generation circuit, a scramble processing circuit for scrambling the tracking signal, an ID code generation circuit for generating a unique recognition code, a tracking signal scrambled by the scramble processing circuit, and a recognition code for the ID code generation circuit And a descrambling circuit for descrambling the tracking signal, and ID detection for detecting whether or not a reproduction recognition code based on the generated recognition code matches a unique recognition code. And the ID detection circuit determines that the reproduction recognition code and the unique recognition code match. The recording / reproducing apparatus is configured so that the tracking signal is descrambled by the descramble processing circuit and the video signal is reproduced only when the recording / reproducing processing is performed. This has the effect of limiting the character.

According to the second invention, a recording medium on which a video signal is successively recorded in the form of a track, a signal generation circuit for generating a head tracking signal recorded on a track of the recording medium, and a scrambled tracking signal A scramble processing circuit for processing, and an ID code generation circuit for generating a unique recognition code, wherein the tracking signal scrambled by the scramble processing circuit and the ID
Since the recording device is configured to record the recognition code of the code generation circuit on the recording medium, it is possible to provide a recording device in which compatibility can be limited only between reproduction devices having the same unique recognition code even between the same models. This has the effect.

According to the third invention, in a reproducing apparatus for reproducing a recording medium on which a scrambled tracking signal, an ID code generation circuit recognition code, and a video signal are recorded, a descrambling for descrambling the tracking signal is performed. A processing circuit, and an ID detection circuit for detecting whether or not a reproduction recognition code based on the recognition code of the ID code generation circuit matches a unique recognition code;
Only when the detection circuit determines that the playback recognition code and the unique recognition code match, the playback device is configured to descramble the tracking signal by the descramble processing circuit and play back the video signal. There is an effect that it is possible to provide a reproducing apparatus capable of limiting compatibility only to recording apparatuses having the same unique recognition code.

[Brief description of the drawings]

FIGS. 1 and 2 show a first embodiment of the present invention.
3 is a circuit block diagram at the time of recording, FIG. 2 is a circuit block diagram at the time of reproduction, FIGS. 3 to 7C show a second embodiment of the present invention, and FIG. FIG. 4 is a circuit block diagram during reproduction, FIG. 5 is a time chart, FIG. 6 (a) is a recording format diagram in a normal mode, and FIG. 6 (b) is a recording format diagram in a scramble mode. FIG. 7A is a diagram showing a head scanning state in a normal mode during reproduction, FIG. 7B is a diagram showing a head scanning state in a normal mode during reproduction, and FIG. 7C is a diagram showing a scrambling mode during reproduction. It is a head scanning state diagram. 1, A: scramble processing circuit, 3: ID generation circuit, 5
... ID detection circuit, 6, B ... descrambling processing circuit.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04N 5/91-5/956 H04N 5/782-5/783 H04N ^7/ 16-7/173

Claims (3)

(57) [Claims] 1. A recording medium on which video signals are successively recorded in a track form, a signal generation circuit for generating a head tracking signal recorded on a track of the recording medium, and a scrambler for scrambling the tracking signal. Processing circuit; an ID code generation circuit for generating a unique recognition code; a tracking signal scrambled by the scramble processing circuit; and a recognition code of the ID code generation circuit, recorded on a recording medium, and the tracking signal is decoded. A descramble processing circuit for performing scramble processing, and an ID detection circuit for detecting whether or not a reproduction recognition code based on the generated recognition code matches a unique recognition code, wherein the ID detection circuit performs reproduction recognition. The descrambling process is performed only when it is determined that the code matches the unique recognition code. Recording reproducing apparatus characterized by reproducing a video signal and descrambles the tracking signal in the circuit. 2. A recording medium on which video signals are successively recorded in the form of a track, a signal generation circuit for generating a head tracking signal recorded on a track of the recording medium, and a scrambler for scrambling the tracking signal. A processing circuit, and an ID code generation circuit for generating a unique recognition code, wherein the tracking signal scrambled by the scramble processing circuit and the recognition code of the ID code generation circuit are recorded on a recording medium. Recording device. 3. A reproducing apparatus for reproducing a recording medium on which a scrambled tracking signal, an identification code of an ID code generation circuit, and a video signal are recorded, wherein: a descrambling circuit for descrambling the tracking signal; Detecting whether or not the reproduction recognition code based on the recognition code of the ID code generation circuit matches the unique recognition code.
Having an ID detection circuit, and reproducing the video signal by descrambling the tracking signal with the descramble processing circuit only when the ID detection circuit determines that the reproduction recognition code and the unique recognition code match. A reproducing apparatus characterized by the above-mentioned.