JPH08237595A - Video signal recorder and information recording medium - Google Patents

Abstract

PURPOSE: To provide a recorder preventing dubbing. CONSTITUTION: The recording servo system of a VTR is provided with a modulation signal generator 75 and a frequency converter 76. A modulation signal is supplied from the modulation signal generator 75 to the frequency converter 76 and the plural frame frequencies of inputted and outputted video signals are periodically modulated. In addition to the modulations, the frame frequencies are made to prevent the substantial control of the recording servo system of other general VTR and are set to change in the range synchronizing with the vertical transmitter of a general receiver, a reproduction can be performed in the reproduction of a normal receiver without impairing art and dubbing is prevented.

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 device and an information recording medium for preventing dubbing.

[0002]

2. Description of the Related Art With the widespread use of recording devices, prerecorded video tapes, video desks, etc. on which movies and the like are recorded are generally on the market. By the way, a recording / reproducing apparatus (VTR or the like) can be used to easily duplicate a copy from these recording media, but dubbing from such a recording medium is restricted by law. However, when dubbing is carried out on a small scale in a general household, it is difficult to regulate it, which is inconvenient for tape sellers and copyright holders.

As a conventional example proposed from such a viewpoint, for example, a recording / reproducing apparatus disclosed in Japanese Patent Publication No. 60-10476 is known. FIG. 8 is a block diagram of a recording system of the recording / reproducing apparatus shown in the known example, and is known as a block diagram of a general recording system.

In the figure, a video signal is input from an input terminal 11 through a recording circuit 12, for example, a pair of rotary magnetic heads 1 and 2 are arranged at an interval of 180 °, and a motor 3 causes a frame frequency. That is, for example, in the case of an NTSC video signal, the video signal is rotated at a rate of 30 times per second. Then, the magnetic tape 4 is obliquely wound around the rotation peripheral surfaces of the magnetic heads 1 and 2 in an angle range of about 180 °, and is sandwiched between the capstan 5 and the pinch roller 6, while the capstan model is held. It is configured to be transferred at a constant speed in the direction indicated by the arrow in the figure by the data transfer device 7.

In the servo circuit 20 of the recording system, the video signal from the terminal 11 is supplied to a sync separation circuit 21 to extract a vertical sync signal, which is supplied to a frequency divider circuit 22 to be a signal having a frequency of 30 Hz. The frequency is divided and the 30 Hz signal is supplied to the phase comparison circuit 23.

On the other hand, the pulse generating means 24 extracts a pulse indicating the rotational phase of each rotation of the magnetic heads 1 and 2, and the pulse is outputted from the frequency dividing circuit 22 in the phase comparison circuit 23. And the comparison output is supplied to the motor 3 through the amplifier 25, whereby the rotational phases of the magnetic heads 1 and 2 are servo-controlled, and the video signal from the recording circuit 12 is sent to the tape 3. The one field is recorded as one oblique magnetic track on the upper side, and the vertical blanking period is provided at the end of the magnetic track.

Further, a frequency generator 26 is provided on the rotating shaft 9 of the capstan 5 so that a frequency corresponding to the number of rotations of the capster 5 can be obtained.
7 and the discrimination is supplied to the capstan motor 7 through the amplifier 28 so that the rotation speed of the motor 7 is measured.
The capstan 5 is controlled by the robot and is rotated at a constant speed.
On the other hand, a 30 Hz signal from the frequency divider 22 is supplied to the magnetic head, and this signal is recorded as a control signal in the longitudinal direction of the lower end of the tape 4.

By the way, the range in which the servo control can be performed in the recording system of the general recording / reproducing apparatus as described above is 60 Hz ± 60 Hz with respect to the video signal having the frame frequency of 60 Hz.
If the selected signal is 1% and the signal to be recorded is a normal NTSC video signal, this recording device will normally record. Therefore, a video signal having a frame frequency outside the range in which servo control can be performed cannot be recorded by a general recording / reproducing apparatus.

The invention disclosed in Japanese Patent Publication No. 60-10476 mentioned above pays attention to this point and sets the frame frequency of the reproduced video signal to a frequency outside the servo control range of the recording system, for example, 58.
Even if an attempt is made to record the reproduced image by setting the frequency to Hz, the general recording apparatus cannot perform servo control and cannot record.

Further, according to the invention disclosed in Japanese Examined Patent Publication No. 59-2433, the reproduced image is colored by modulating the leading edge or the trailing edge of the horizontal synchronizing pulse to interfere with the reproduction of the carrier color signal. It is intended to prevent dubbing by giving disorder.

[0011]

However, according to the invention disclosed in Japanese Patent Publication No. 60-10476, since the frame frequency of the reproduced video signal is set to 58 Hz, which is shorter than the usual 60 Hz, the reproduction time is shortened. There was a concern that the reproducibility would be impaired in the image contents that emphasize the artistry.

Further, according to the invention disclosed in Japanese Patent Publication No. 59-2433, it is premised that the color signal is disturbed, and the black-and-white image cannot be disturbed. There was a problem saying that it should not happen.

Therefore, the present invention solves the above-mentioned problems, and provides a video signal recording apparatus and an information recording medium which can surely prevent dubbing without impairing reproducibility even when art is emphasized. To provide.

[0014]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a video signal having a frame frequency of a plurality of periodically changing frequencies while being controlled by a recording servo means. A video signal recording device for recording on a recording medium, wherein the frame frequency is set outside a substantial control range of a recording servo means of a device different from the device, and a vertical transmission of a receiver is performed. There is provided a video signal recording device characterized by being set so as to change within a range synchronized with the device.

Further, the video signal recording apparatus is provided with a signal processing means for controlling the incoming video signal into a plurality of frequencies which periodically change with respect to the recording medium while being controlled by the recording servo means. The frame frequency is set outside the control range of the recording servo means of a device different from the device, and is changed within a range synchronized with the vertical oscillator of the receiver. Provided is a video signal recording device characterized by the above.

Further, there is provided an information recording medium in which a video signal recording apparatus having a recording servo means records a plurality of periodically changing frequencies of a video signal as a frame frequency. The frequency is set outside the substantial control range of the recording servo means of a device different from the device, and the frequency is recorded with a change in the range synchronized with the vertical oscillator of the receiver. An information recording medium is provided.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. The same components as those of the conventional example are designated by the same reference numerals, and detailed description thereof will be omitted. FIG. 1 is a schematic block diagram of a recording system of a VTR according to an embodiment of the present invention. In the figure, when, for example, an NTSC video signal comes in from the input terminal 11, one signal is supplied to the rotary magnetic heads 1 and 2 arranged at an angular interval of 180 ° through the recording circuit 12. These rotary magnetic heads 1 and 2
Are recorded on the magnetic tape 4 according to a plurality of modulated frame frequencies which will be described later.

Reference numeral 200 denotes a recording servo circuit which constitutes a main part of the present invention. The branched video signal is taken out as a vertical synchronizing signal by the sync separating circuit 21, and the vertical synchronizing signal is taken by the frequency divider 22. The signal is divided into a 30 Hz signal and supplied to the frequency converter 76.

A modulation signal is supplied from the modulation signal generator 75 to the frequency converter 76, and is modulated into frame signals S1 to S13 as shown in FIG. These frame signals S1 to S13 have different degrees of modulation with the passage of time, and are modulated so that the maximum is 102% and the minimum is 98%, and are averaged to be signals of 30 Hz.

In this case, no abrupt modulation change is made,
In the frame signals S1, S6, S7, S12 and S13,
The frame frequency is set to a frequency [30 Hz ± 2%] that is outside the allowable range of servo control of a general VTR recording system [30 Hz ± 1%], and the playback system servo is set. For the camera, it is set to the control range and the range synchronized with the vertical transmitter of the receiver.

Then, one modulation signal output from the frequency converter 76 is supplied to one input of the phase comparison means 23, and the rotary shaft 8 is supplied to the other input.
From the pulse generating means 24 directly connected to the magnetic head 1,
A pulse indicating the rotation phase generated for each rotation of 2 is supplied.

The phase comparison means 23 uses the above-mentioned frame.
The phase signals S1 to S13 and the pulse supplied from the pulse generating means 24 are phase-compared each time they are input, and the comparison output is supplied to the motor 3 through the amplifier 25. Are controlled so that the video signal supplied from the recording circuit 12 is sequentially recorded on the tape 4 while forming an inclined track.

Further, a signal having a frequency corresponding to the rotation speed of the capstan 5 is obtained from the frequency power generator 26 directly connected to the rotary shaft 9 of the capstan 5, and this signal is supplied to the frequency discriminator 27, The discrimination output is supplied to the capstan motor 7 through the amplifier 28, and the capstan 5 is rotationally controlled at a constant speed.

The frame signal having an average of 30 Hz output from the frequency converter 76 is transmitted through the control head 29 as a control signal for reproduction at the lower end of the tape 4 and in the longitudinal direction. It is designed to be recorded sequentially in each direction.

The tape 4 recorded as described above is
This time, when reproducing with a well-known general reproduction system (not shown) or another device, it is set within the control range of the servo of the reproduction system of such a device at the time of recording. The reproduction can be performed without causing any inconvenience. Further, in the recording system described above, the frame frequency of the image signal is not shortened as in the device shown as the above-mentioned conventional example, and the frequency is synchronized with the vertical oscillator of a known general receiver. Since it is set to a range that can be reproduced, it can be reproduced without impairing the artistry even when reproduced on a general receiver.

However, when the recorded video signal is reproduced from the tape 4 recorded as described above and recorded by another general recording apparatus, the frame frequency is changed. Since a frequency [30 Hz ± 2%] outside the control range [30 Hz ± 1%] of the recording servo of a general recording device is set, normal recording cannot be performed because servo control cannot be performed.
That is, dubbing cannot be performed.

Next, a second embodiment will be described with reference to FIG. The figure shows a schematic block diagram of an information recording apparatus capable of recording and reproducing by mounting a disk (for example, an optical video disk) for recording audio and video data and a memory cartridge. is there.

In the figure, this information recording / reproducing apparatus is
Spindle motor 52, read / write section 53, spindle servo section 54, focus tracking servo section 55, servo control circuit 56, RF amplifier 57, reproduction demodulator 58, laser. The drive unit 59, recording modulator 60, signal processing circuit 61, output analog circuit 6
2, input analog circuit 63, CPU 64, operation unit 6
5, a display unit 66, a CPU 67 that controls the entire system,
The switch 31 and 32 are generally configured. Reference numeral 30 denotes a memory cartridge, and the memory cartridge 30 is detachably provided by a connector (not shown) or the like, so-called a memory card (SRAM card,
It is a solid-state memory called an EEPROM card.

First, the recording operation on the optical disk 51 in this apparatus will be described. When the operator operates the operation unit 65 to set the [disk recording mode], the CPU 67 accordingly supplies the selection signal to the CPU 64 and connects the switch 32b to the connection terminal k side. .

At the same time, the servo control circuit 56 causes the spindle servo unit 54 and the focus tracking servo unit 55 to rotate the SP motor 52 and read the reading unit 5.
The focus of No. 3 is set to the optimum state, and the position of the read / write unit 53 is set to the recording start position of the optical disc 51.

When the video and audio signals are input through the input analog circuit 63, the encoder 75 outputs M.
PEG compression processing is performed, and DS is applied to the data.
Encoding processing is performed by the signal processing unit 70 composed of P (digital signal processor).

As for the data at this timing, for example, as shown in FIG. 4, a sync, a header indicating the absolute time, and subcode information are arranged at the head of each sector, respectively. User data is arranged, and the moving image (V) and the audio information (A) are mixed and arranged on the user data.

The data read from the signal processing unit 61 is sequentially written in the buffer memory 80,
The read speed of the written data is changed by the modulation signal generator 78, and one frame corresponding to one screen is displayed.
The length of the data becomes the data which is periodically modulated.

The data thus modulated is output to the recording modulator 60 and recorded on the optical disk 51. The audio signal may be separately recorded even in the analog state, but the description thereof will be omitted. FIG. 5 is a schematic configuration diagram of the optical disk 51, which has the same shape as a conventional general-purpose compact disk (CD) dedicated to music, and a lead-in area is provided in the innermost circumference thereof, and a TOC (Table) is provided in this area. O
f Contents) data is recorded. And
A program area in which the above-mentioned compressed information is recorded and a read-out area are provided on the outer circumference of the program area.

Next, the operation of reproducing the information recorded on the optical disk 51 will be described. Similar to the recording operation, the operation unit 65 is used to set the [disk reproduction mode].
In response to this, a selection signal is supplied from the CPU 67 and the switch 32a is controlled to the contact i side. This time,
The switch 31 is opened. In this way, the reproduction signal corresponding to the audio and image data read from the reproduction demodulator 58 by reproducing the optical disk 51 is sequentially passed through the switch circuit 32a and the signal processing unit 70. While the audio data is reproduced, the video data is output to the outside as a normal video signal capable of forming one image while being subjected to signal processing. The system clock 77 supplies a clock signal for signal processing in each circuit described above.

The video signal output as described above is
When attempting to reproduce by a known general receiver, the frame frequency is changed in the range synchronized with the vertical oscillator, and therefore reproduction can be performed without any inconvenience. An apparatus having another general recording servo for reproducing the reproduced video signal (a disk recording apparatus as in this embodiment, a general V
(TR, etc.), in the case of recording, a signal similar to that shown in the above-described embodiment, that is, a frequency at which a plurality of periodically changing video signals is set as a frame frequency, This is outside the control range of the recording servo of the device, and normal recording cannot be performed.

Further, in the apparatus of this embodiment, recording on the memory cartridge 30 is also possible. In this case, if the operation unit 65 is set to [memory recording mode],
The CPU 67 switches the switch 32b to the terminal 1 side and closes the switch 31.
The audio and video data processed in the same manner as described above by the No. 1 sequentially pass through the switches 32b and 31 and are stored in the memory card.
It will be recorded in the trench 30.

Further, in the apparatus of this embodiment, the video signal recorded on the optical disk 51 is transferred to the memory cartridge 3.
It is also possible to perform dubbing to 0. In this case as well, in the same manner as described above, the [disk reproduction-memory recording mode] is set by the operation unit 65. As a result, the switch 31 is closed under the control of the CPU 67. As a result, the data read from the reproducing demodulator 58 is recorded in the memory cartridge 30 through the switch circuit 31. Therefore, the audio and video data having the same frame frequency as that recorded on the optical disk 51 is also recorded on the memory cartridge 30.

When reproducing the audio and video data from the recorded memory cartridge 30, the operation unit 65 is used.
Is set to the [memory reproduction mode], the switch 31 is opened and the switch 32a is switched to the terminal j side, so that the data stored in the memory cartridge 30 is transferred to the switch 32a and the signal. It is output to the outside through the processing circuit 61 and the output analog circuit 62 in order. As a matter of course, the data recorded in the memory cartridge 30 is
However, even if an attempt is made to record the data with an apparatus having another general recording servo system, normal recording cannot be performed.

In each of the above-mentioned embodiments, the frame signals shown in FIG. 2 are converted into the frame signals shown in FIG.
The signal S1 to S8 may be used. In this case, the frequency change between the frames is set within the permissible range [30 Hz ± 1%] of the recording servo system of a general recording apparatus, and especially the signal S3
→ S4, S4 → S5, S5 → S6
It is set so that the frequency fluctuation is caused. By doing so, reliable hunting can be generated in the servo of the recording system, and normal servo control can be prevented. That is, it is substantially set outside the control range of the recording servo system in a general recording apparatus. In particular, such a method is an effective method because the memory cartridge 30 having no recording servo system is not accompanied by the pull-in operation during the servo.

Further, as shown in FIG. 7, the change in each frame frequency in each of the above-described embodiments is caused by a triangular wave [FIG. 7 (a)], a sine wave [FIG. 7 (b)], or a sawtooth wave [. Figure 7
(C)] may be used.

[0042]

According to the present invention, even if an attempt is made to record with a recording apparatus having a general servo system, normal servo control cannot be performed, and dubbing can be prevented regardless of black and white images and color images. It is possible to provide a recording device and an information recording medium that can be realized. In particular, even when the recorded image is reproduced, the video signal in consideration of the prevention of dubbing can be recorded without impairing the artistry of the reproduced image. Further, according to the invention described in claim 2, since the frame frequency is periodically changed by the signal processing means, the frequency can be accurately recorded on the recording medium.

[Brief description of drawings]

FIG. 1 is a schematic block diagram of a recording system of a VTR according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a modulated frame signal of a video signal.

FIG. 3 is a schematic block diagram of a video signal recording / reproducing apparatus according to a second embodiment of the present invention.

FIG. 4 is a diagram showing a data stream conforming to the MPEG1 standard.

FIG. 5 is a diagram showing a schematic configuration diagram of an optical disk.

FIG. 6 is a diagram showing another example corresponding to FIG.

FIG. 7 is a diagram showing a waveform of a frame frequency of a video signal.

FIG. 8 is a schematic block diagram of a recording system in a conventional VTR.

[Explanation of symbols]

 1, 2 rotating magnetic head 4 magnetic tape 12 recording circuit 21 synchronization separation circuit 23 phase comparison means 24 pulse generation means 2 52 spindle motor 54 spindle servo section 55 focus tracking servo section 58 reproduction Demodulator for recording 60 Modulator for recording 61 Signal processing circuit 64, 67 CPU 70 Signal processing unit 75 Modulation signal generator 76 Frequency converter 78 Modulation signal generation unit 80 Buffer memory

Claims (3)

[Claims] 1. A video signal recording apparatus for recording on a recording medium a video signal having a frame frequency of a plurality of periodically changing frequencies while being controlled by a recording servo means. The system frequency is set outside the control range of the recording servo means of a device different from the above device, and is set so as to change within a range synchronized with the vertical oscillator of the receiver. Video signal recording device. 2. A video signal recording apparatus comprising signal processing means for controlling an incoming video signal into a plurality of frequencies which periodically change with respect to a recording medium while being controlled by the recording servo means. The frame frequency is set outside the control range of the recording servo means of a device different from the device and is changed within a range synchronized with the vertical oscillator of the receiver. A video signal recording device characterized by the above. 3. An information recording medium in which a video signal recording device having a recording servo means records a plurality of periodically changing frequencies of a video signal as a frame frequency. The frequency is set outside the substantial control range of the recording servo means of a device different from the device, and the frequency is recorded with a change in the range synchronized with the vertical oscillator of the receiver. An information recording medium characterized by: