JPH0722403B2 - Video signal recording medium duplication device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal recording medium duplicating apparatus, and more particularly to reproducing a video signal recorded on a magnetic recording medium such as a magnetic disk, a magnetic tape, a magnetic drum or the like to another magnetic recording medium. The present invention relates to a video signal recording medium duplication device for recording.

BACKGROUND ART Recently, an image pickup apparatus such as a solid-state image pickup device or a pickup tube is combined with a recording apparatus using a magnetic disk that is inexpensive and has a relatively large storage capacity as a recording medium, and a still image of a subject is captured purely electronically to obtain a steady state. An electronic still camera system has been developed in which images are recorded on a rotating disk and images are reproduced by a separate television system or printer.

In a rotating magnetic recording medium used in an electronic still camera system or the like, for example, a disc having a diameter of about 50 mm has a track pitch of about 100 μm, that is, a track width of about 50 to 60 μm and a guard band width of about 50 to 40 μm. Will record 50 tracks. In the recording or reproducing apparatus, the magnetic disk rotates at a constant speed of, for example, 3,600 rpm, and the video signal is recorded or reproduced at the field or frame speed.

In the currently proposed method, the luminance signal of the video uses a high frequency band of 2.5 MHz or more, including the synchronization signal, and
It is FM modulated from Hz to 7.5MHz. Chroma signals are color-difference line-sequential systems that use the lower band.
FM modulated, RY signal is 1.2MHz, BY signal is 1.3MHz
Is the center frequency. Further, data such as fields or frame numbers can be multiplex-recorded by differential PSK modulation.

The video signal recorded on the magnetic disk is read by a reproducing device, demodulated, encoded into a standard color television format such as NTSC, and visualized on a video monitor device.

Thus, a highly useful device for copying a magnetic disk on which a video signal is recorded is required.

In other words, there is a demand for a video signal recording medium duplication device capable of dubbing a video signal with a simple operation while monitoring the video to be dubbed.

One of the conditions required for the dubbing device is that the recorded signal is less deteriorated, and thus the quality of the reproduced image is less deteriorated. Further, in order to prevent deterioration of image quality, it is desirable not to require a special circuit such as emphasis compensation. Further, it is possible to edit the contents to be recorded on the image recording medium, and it is possible to simultaneously record from one video signal source to a plurality of recording mediums in terms of work efficiency, especially when the duplication of such recording medium is a business. Is required.

Aim of the Invention In view of such a demand, an object of the present invention is to provide a video signal recording medium duplication device capable of recording a video signal with a minimum deterioration in image quality.

In the present specification, the term “copy” does not only mean that all video signals recorded on a recording medium are re-recorded on another recording medium as they are, but that those video signals are selectively recorded on another recording medium. It should be broadly construed to include "editing" to be re-recorded on the medium.

DISCLOSURE OF THE INVENTION According to the present invention, an image in which a modulated video signal is read from a first magnetic recording medium on which a modulated video signal modulated by a luminance signal and a chrominance signal is recorded and is recorded on a second magnetic recording medium. The signal recording medium duplicating apparatus drives the first magnetic recording medium to read the modulated video signal from the first recording medium, and the second magnetic recording medium in synchronization with the driving of the first magnetic recording medium. Driving means, a separating means for separating a luminance signal and a color signal from the read modulated video signal, a first limiter means for limiting the level of the separated luminance signal, and a level of the separated color signal. Second to limit
Limiter means, first frequency characteristic correction means for correcting the frequency characteristics of the level-limited luminance signal, second frequency characteristic correction means for correcting the frequency characteristics of the level-limited color signal, and first and second Recording means for synthesizing the luminance signal and the chrominance signal respectively output from the second frequency characteristic correcting means and recording them in the form of a modulated video signal on the second magnetic recording medium.

Description of Embodiments Embodiments of a video signal recording medium duplicating apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

The portion shown in FIG. 1A is a portion that realizes the reproducing function of the video signal from the magnetic disk, and the portion shown in FIGS. 1B and 1C mainly realizes the function of recording the video signal to another magnetic disk. It is the part to do. Both parts may constitute separate devices.

In the device of this embodiment shown in these figures, two deck parts are used.
10A and 10B, to which a rotary recording medium 12 such as a magnetic disk is detachably mounted on the rotary shafts of DC motors 14A and 14B, respectively.

In the present embodiment, the magnetic disk 12 has a magnetic recording material sheet having a diameter of about 50 mm, and a plurality of, for example 50
Book recording tracks are recorded on a concentric circle at a predetermined pitch (for example, about 100 μm). The signal recorded on the recording track is a video signal, which in this embodiment may be a color video signal in which the luminance signal Y and the chroma signal C are FM-modulated. As the video signal, for example, a field video signal forming one field of an image by raster scanning is recorded to one track.

The luminance signal Y, including the synchronization signal S, uses a high frequency band of 2.5 MHz or more and is FM-modulated over 6 MHz to 7.5 MHz. The chroma signal C is FM-modulated using a lower band below that, and the RY signal of the two color difference signals is
The center frequency of 1.2MHz and BY signals is 1.3MHz.
This color difference signal employs a color difference line sequential system in which two types are alternately repeated for each horizontal scanning line. In addition, the data such as the field or frame number
It can be multiplexed into the video signal by K (DPSK) modulation. This DPSK signal is superimposed on the FM modulation signal as data of a carrier frequency of 204.54 kHz.

The DC motors 14A and 14B have a mechanism for generating an AC frequency signal or a phase synchronization signal in synchronization with the rotation of the DC motors 14A and 14B, respectively. Servo controlled to rotate at a constant speed in rotation / minute. Servo circuit 20A
And 20B are controlled to rotate and stop the disk 12 by control devices 22A and 22B for controlling the reproduction function section and the recording function section, respectively, and a phase synchronization signal is supplied from a sync separation circuit 106A described later. The phase synchronization signal may be generated from the disk 12. In this case, it can be obtained by detecting a timing mark provided on a part of the core of the magnetic disk 12.

The deck section 10A functions as a reproducing section of a video signal as described later. Therefore, the disk 12 on which the video signal has been recorded is mounted on the deck portion 10A. Such a disc
A magnetic transducer, that is, a magnetic head 24A is arranged on the 12 recording surfaces. The magnetic head 24A is carried by a head transfer mechanism (not shown), and is moved in both directions along the recording surface of the magnetic disk 12 in the radial direction thereof under the control of tracking servo. The control is performed by the control unit 22A, and an arbitrary track on the recording surface can be selected by operating an operation unit (not shown) of the present apparatus.

The magnetic head 24A has a reproduction function of detecting a video signal from a track already recorded on the recording surface 18 and converting it into a corresponding electric signal. As described above, in this embodiment, the disk 12 rotates at a constant speed of 3,600 rotations / minute, so that one rotation is 1 / 60th.
The video signal for one track, that is, the FM-modulated video signal for one field is reproduced from the magnetic head 24A every second.

The reproduction output 32 of the magnetic head 24A passes through the preamplifier 34A to the RF output terminal 35 on the one hand, and three filters on the other hand, a high pass filter (HPF) 36A, a low pass filter (LPF) 38A, and a band pass filter (BPF) 40A. It is connected to the. High pass filter
36A is a filter for passing the high frequency component of the video signal read by the magnetic head 24A, that is, the luminance signal Y and the synchronizing signal S, and its output 42A is connected to the FM demodulator 44A. The FM demodulator 44A demodulates the luminance signal Y and the sync signal S, and the demodulated output 200A is the sync separation circuit 106A.
And is connected to one input of encoder 202A.

The sync separation circuit 106A is a circuit that separates the vertical sync signal VSYNC from the output signal of the demodulator 44A and outputs it to the servo circuit 20A and the sync signal output 110.

The low-pass filter 38A is a low-pass component C of the video signal read by the magnetic head 24A, that is, a line-sequential color difference signal RY.
And a filter that passes BY, and outputs 48
A is connected to another FM demodulator 50A. FM demodulator 50A
Demodulates the color difference signal C, and its demodulated output 52A is connected to the other input of the encoder 202A.

The output 72A of the bandpass filter 40A is connected to the DPSK demodulator 204A. The DPSK demodulator 204A demodulates the 204.54 kHz DPSK signal superimposed on the video signal, and outputs this as digital data from the output 206A to the control unit 22A.

The signal processing circuit 202A requires a circuit for synchronizing the line-sequential color difference signals output from the demodulators 44A and 50A, a circuit for synthesizing the composite luminance signal Y + S and the color difference signal C, a circuit for field / frame conversion by scanning line interpolation, etc. Including a circuit
Further, it is a signal processing circuit including an encoder that forms a standard composite color television video signal such as an NTSC circuit. At that time, the DPS given from the demodulator 204A to the control unit 22A
Character data such as a frame number included in the K data is multiplexed on the screen by the signal processing circuit 202A. The color video signal thus formed is output from the video signal output (VIDEO) 208A of the signal processing circuit 202A and displayed on the video monitor device 210A such as a CRT.

The control unit 22A is a control device that controls the reproduction function unit of the apparatus in accordance with the operation of the operation unit, and is advantageously configured by, for example, a microprocessor system. Control unit
22A is connected to each component in the device, the connection to each component is symbolically shown by connecting line 78B.

Referring to FIG. 1B, the deck section 10B functions as a video signal recording section as described later. Therefore, the deck section 10
B is generally a disc 12 with no video signal recorded.
Is installed. A magnetic transducer, that is, a magnetic head 24B is arranged on the recording surface of such a disk 12. The magnetic head 24B is carried by a head transfer mechanism (not shown), and moves along the recording surface of the magnetic disk 12 in both radial directions. The control is performed by the control unit 22B. The magnetic head 24B has not only a recording function of magnetically recording a video signal on the recording surface 18, but also a reproducing function in this embodiment.

Regarding the playback function in the recording function section shown in FIG. 1B,
It has almost the same configuration as the reproduction function section shown in FIG. 1A. 1A
Constituent elements similar to those shown in the drawings are attached with the reference numeral B to avoid duplication of description.

The servo circuit 20B that servo-controls the motor 14B is a switch.
A vertical sync signal is selectively received from sync signal terminal 110 and sync separation circuit 106B via 220. When dubbing from the magnetic disk 12 of the deck section 10A to the magnetic disk 12 of the deck section 10B, the sync signal terminal 110 is connected to the sync separation circuit 106 of FIG. 1A.
Receives vertical sync signal from A. When recording a video signal supplied from the outside onto the magnetic disk 12 of the deck section 10B, the sync separation circuit 106B shown in FIG.
Upon receiving the composite luminance signal Y + S input to 0, the synchronizing signal S is separated.

The servo circuit 20B is connected to the sync separation circuit 106A or 106B according to the connection state of the switch 220, receives the sync signal S from either of them, and synchronizes with this to receive the sync signal S.
The magnetic disk 12 of the recording deck section 10B is rotated in synchronism with this by controlling the. A magnetic disk
A servo lock may be applied to the motor 14B by a phase synchronization signal (PG) obtained by detecting a timing mark provided on a part of the 12 cores.

The magnetic head 24B is connected to the preamplifier 34B via the switch 222.
And the recording amplifier 162. Preamplifier 34B
Is connected to one terminal 226 of the other switch 224. The other terminal of the switch 224 is connected to the RF signal terminal 35. The mover 228 of the switch 224 is connected to the inputs of three filters, that is, the high pass filter 36B, the low pass filter 38B and the band pass filter 40B.

The output 42B of the high pass filter 36B is connected to the limiter 242 through the delay circuit 240, and the output 48B of the low pass filter 38B is connected to the limiter 244. The outputs of limiters 242 and 244 are connected to level adjusters 250 and 252, respectively.

The delay circuit 240 includes a circuit system including a high-pass filter 246 for the composite luminance signal Y + S and an f (frequency) characteristic correction circuit 248, which will be described later, and a circuit system including a high-pass filter 272 for the color difference signal C and an f characteristic correction circuit 278. It is a circuit that compensates for the difference in signal delay time. Usually, the latter has a larger signal delay than the former, and a delay time substantially equal to the difference between the respective delay times generated in the two circuit systems, for example, a delay of about 300 to 500 nanoseconds is added from the high-pass filter 36B. The delay time of the delay circuit 240 is set so as to give it to the luminance signal Y + S.
As a result, the time coincidence of both signals Y + S and C is realized.

By the way, in general, the reproduction frequency characteristic of the magnetic head shows a tendency that the reproduction signal level decreases as the frequency increases. On the other hand, some video floppy standards require that the current level when recording a video signal be constant at 2.5 MHz or higher. Therefore, in order to make the levels of the composite luminance signal Y + S and the color difference signal C obtained from the high-pass filter 36B and the low-pass filter 38B almost constant regardless of the frequency,
Limiters 242 and 244 limit the levels, and level adjusters 250 and 252 allow the signal levels to be adjusted, respectively. When the limiter is applied, only the color difference signal is taken out and the DPSK signal is removed.

As can be seen from this, in the present embodiment, the limiter 242 and 244 limit the level of the signal that has been output and separated from the DPSK signal. Therefore, the low frequency DPSK signal superimposed on the FM carrier wave is not limited and lost, so that it is properly demodulated by the demodulator 204B and the control unit
22B has this available as complete data.

The outputs 254 and 256 of level adjusters 250 and 252 are connected to one terminal of switches 258 and 260, respectively. On the other hand, the composite luminance signal Y + received from the terminal 230 from the outside
S is input to the FM modulator 156. The FM modulator 156 is a circuit that frequency-modulates the above-mentioned carrier in the high band with this composite luminance signal Y + S. The color difference signal C received from the outside at the terminal 262 is input to the FM modulator 152. The FM modulator 152 is a circuit that frequency-modulates the carrier of the above-mentioned low band with the color difference signal C.

The outputs 264 and 266 of these FM modulators 156 and 152 are connected to the other terminals of switches 258 and 260, respectively. The armature terminals 268 of these switches 258 and 260
And 270 are high pass filter 246 and low pass filter 272.
Connected to the input of. The high-pass filter 246 and the low-pass filter 272 have the same frequency characteristics as the high-pass filter 36A and the low-pass filter 38A described above, respectively.

The outputs 274 and 276 of the high pass filter 246 and the low pass filter 272 are connected to the f characteristic correction circuits 248 and 278, respectively. Both f characteristic correction circuits 248 and 278 are circuits for respectively compensating the levels of the composite luminance signal Y + S and the color difference signal C obtained from the high-pass filter 246 and the low-pass filter 272 so as to be substantially constant regardless of the frequency. Their outputs 280 and 282, respectively, are level adjusters 284.
And connected to 286.

DP provided to the data line 232 from the control unit 22B of the recording function unit
The SK data is input to the DPSK modulator 288. The DPSK data includes information to be recorded on the magnetic disk 12 of the deck section 10B, and is input from the operation section of the control section 22B, for example. The DPSK modulator 288 DPSK-modulates this and outputs it to the output 290, which is connected to the bandpass filter 292.
The bandpass filter 292 has the same pass frequency band as the bandpass filter 40A described above, and its output 294 is connected to the level adjuster 296.

Level adjusters 284, 286 and 296 outputs 298, 300 and 3 respectively
02 is connected to the mixer 304. The mixer 304 mixes the video signals frequency-modulated in the respective bands input to the two inputs 298 and 300, and combines the other video signals.
The differential PSK-modulated data signal given to 2 is superimposed on this.

The output 306 of mixer 304 is provided to recording amplifier 162.
The output of the recording amplifier 162 is connected to the recording magnetic head 24B via the switch 222.

The control unit 22B is a control device that controls the recording function unit of the apparatus in accordance with the operation of the operation unit similarly to the control unit 22A,
It is advantageously constructed, for example, by a microprocessor system. A DPSK data input section 234 is connected to the control section 22B, and the DPS to be recorded on the magnetic disk 12 of the recording deck section 10B.
K data can now be entered.

The control unit 22B is connected to each component in the present apparatus, and the connection with each component is symbolically shown by a connecting line 78B. For example, switches 220,222,224,258, and
Opening / closing of 260 is controlled by the control unit 22B, and a video signal is read from the magnetic disk 12, displayed on the monitor device 210B, and recorded on the magnetic disk 12.
Further, the recording-related circuit such as the recording amplifier 162 is controlled at an appropriate timing to supply the 1-field video signal to the magnetic head 24B, and thereby the 1-field video signal for 1 track is recorded.

The operation of loading the recorded disk 12 in the reproduction deck section 10A, loading the unrecorded magnetic disk 12 in the recording deck section 10B, and dubbing from the former to the latter will be described. When the operating section is operated to instruct dubbing, the control section 22B causes the switch 2
20, 222, 224, 258 and 260 are connected to each other in the opposite connection state. The control unit 22B also controls the head transfer mechanism to move the head 24B onto an empty track of the magnetic disk 12 of the recording deck unit 10B.

The motor 14A rotates at a steady speed under the control of the servo circuit 24A, and the motor 14B rotates in synchronization with this under the control of the servo circuit 20B. That is, the synchronization signal S is calculated from the signal read from the magnetic head 24A and output from the FM demodulator 44A.
Is separated by the sync separation circuit 106B, which is the servo circuit 20B.
The motor 14B is servo-locked by the rotation of the motor 14B.

Then, when you operate the operation section and instruct to start dubbing,
The control unit 22A controls the head 24A of the recording deck unit 10A and arranges it on the first track of the recording surface. For example, the RF frequency video signal read by the head 24A from the first track is
The filters 36A and 38A separate the composite luminance signal Y + S including the synchronization signal S and the color difference signal C, and the demodulator 44A
And 50 A to demodulate to baseband signals. The sync signal S is output by the sync separation circuit 106A.
It is separated into 110 and supplied to the servo circuit 20A. The luminance signal Y + S and the color difference signal C including the synchronization signal are supplied from the FM demodulators 44A and 50A to the signal processing circuit 202A.

Similarly, the DPSK signal superimposed on the video signal read by the head 24A is separated from the composite luminance signal Y + S and the color difference signal C by the filter 40A, and demodulated by the demodulator 204A into a baseband signal. This is input to the control unit 22A as DPSK data.

Composite luminance signal Y + S output from demodulators 44A and 50A
The line-sequential color difference signal C is combined by the signal processing circuit 202A, output as a composite color video signal from the video signal terminal 208A, and displayed on the video monitor device 210A. At that time, the character data such as the frame number included in the DPSK data input from the demodulator 204A to the control unit 22A is superimposed on the video signal by the signal processing circuit 202A and multiplexed on the monitor projection screen.

On the other hand, the RF signal output from the preamplifier 34A is
Is also input to the high pass filter 36B, the low pass filter 38B and the band pass filter 40B via the switch 224. This is converted into a composite color video signal by the demodulators 44B, 50B and 204B, the signal processing circuit 202B, and the control unit 22B in the same manner as the operation in the reproduction function unit described above, and the output terminal
It is output to 208B. If there is DPSK data to be recorded on the magnetic disk 12 of the recording deck section 10B, this DPSK data
Input from the data input unit 234. This is transferred from the control unit 22B to the signal processing circuit 202B, and is superimposed on the monitor video signal by the signal processing circuit 202B. Thus, in this example, the operator can see the image of the first track on the monitor device 210B.

The composite luminance signal Y + S that has passed through the high-pass filter 36B is also input to the delay circuit 240, receives a predetermined time delay in the same circuit 240, and is input to the limiter 242. This is the limiter 2
The level is limited by 42 and set to a predetermined level by the level adjuster 250, and the high pass filter 246 is set through the switch 258.
Entered in. Similarly, the color difference signal C that has passed through the low pass filter 38B is also input to the limiter 244. This is because the level is limited by the circuit 244 and the level adjuster 250
Is set to a predetermined level by and is input to the low-pass filter 272 through the switch 258.

Composite luminance signal Y whose band is limited by the high-pass filter 246
The frequency characteristic of + S is corrected by the f characteristic correction circuit 248, and is input to the mixer 304 through the level adjuster 284.
Similarly, the frequency characteristic of the color difference signal C whose band has been limited by the low-pass filter 272 is corrected by the f characteristic correction circuit 278, and is input to the mixer 304 through the level adjuster 286.
On the other hand, the data was input from the DPSK data input unit 234 to the control unit 22B.
The DPSK data is input to the DPSK modulator 288, which uses the DPS.
K modulated. This is band-limited by the band filter 292, the frequency characteristic is corrected by the f characteristic correction circuit 248, and is input to the mixer 304 through the level adjuster 296.

In the mixer 304, the composite luminance signal Y + S, the line-sequential color difference signal C, and the DPSK data signal from these three inputs 298, 300 and 302 are combined and output to the input 306 of the recording amplifier 162.

The control unit 22B synchronizes with the rotation of the magnetic disk 12 of the recording deck unit 10B and records the recording amplifier 16 at a proper timing for a period of 1V.
The signal is supplied from 2 to the magnetic head 24B, whereby a video signal for one feed is recorded on one track of the magnetic disk 12 of the recording deck section 10B.

When dubbing is completed for one track, the control unit
22A and 22B can control the head transfer mechanisms 28A and 28B of the corresponding deck sections 10A and 10B to advance the tracks of both disks 12 by one and repeat the above operation.
By sequentially performing this for each track of the magnetic disk 12 of the reproduction deck section 10A, those video signals are sequentially recorded on the unrecorded magnetic disk 12 of the recording deck section 10B, and dubbing is performed.

By the way, when the recording of the video signal on one track of the magnetic disk 12 of the deck section 10B is completed, the control section 22B sets the switches 222 and 224 to the connection state shown in the figure,
This can be displayed on the monitor device 210B.

Regarding the video monitor, the monitor device 210A can monitor the video recorded on the magnetic disk 12 loaded in the reproduction deck section 10A. Further, the monitor device 210B can monitor an image to be recorded on the magnetic disk 12 loaded in the recording deck section 10B and an image reproduced from the image signal already recorded on the image. Magnetic disk
The monitor of the video to be recorded in 12 is the deck section of the playback function section.
Not only the video signal from the magnetic disk 12 loaded in 10A but also the video signal supplied from the external terminals 230 and 262 is possible.

When the video signals supplied from the outside to the terminals 230 and 262 are recorded on the magnetic disk 12 of the recording deck section 10B, the control section 22B sets the switches 220, 222, 224, 258 and 260 to the connection state shown in the figure. As a result, the sync signal S separated by the sync separation circuit 106B from the composite luminance signal Y + S input to the terminal 230 is supplied to the servo circuit 20B, and the motor 14B rotates in synchronization with this.

The video signal to be recorded is input from the input terminals 230 and 262 to the FM demodulators 156 and 152, and the filters 246 and 272, the f characteristic correction circuits 248 and 278, the mixer 304, and the recording amplifier 162 are input to the magnetic head 24B in the same manner as described above. Supplied. Also,
The DPSK data from the control unit 22B is superposed on this if necessary.

As described above, in the present embodiment, the video signal to be dubbed is changed from the reproduction function unit shown in FIG. 1A to the recording function unit shown in FIGS. 1B and 1C in the form of a radio frequency (RF) signal instead of a baseband signal. Are transferred in. Therefore, even if a special circuit such as emphasis compensation is not provided, the deterioration of the recorded signal is small, and the deterioration of the image quality of the recorded image is small. This also
This means that the frames recorded on the magnetic disk can be edited without degrading the image quality.

This RF signal interface further connects a plurality of recording function units shown in FIG. 1B and FIG. 1C to one reproduction function unit shown in FIG. 1A to connect a plurality of unrecorded magnetic disks from one recorded magnetic disk. It makes it possible to copy to a disc.

Another embodiment of the present invention is shown in FIGS. 2A and 2B. In the figure, the same components as those in FIGS. 1A and 1B are designated by the same reference numerals, and in this embodiment, the first component C
The circuit configuration shown in the figure is applied. Therefore, the explanation of the overlapping part is avoided.

In the embodiment shown in FIGS. 1A to 1C, the reproduction function unit and the recording function unit were interfaced with the modulated video signal including the composite luminance signal and the color difference signal, but the embodiment shown in FIGS. 2A and 2B. In FIGS. 1A to 1C, the two are interfaced in the form of being separated into the component signal of the video signal, that is, the composite luminance signal Y + S, the color difference signal C and the DPSK data.
This is different from the embodiment shown in the figure. Of course, also in this case, the video signal is in the form of a modulation signal, not a baseband signal.

To this end, in the embodiment of FIGS. 2A and 2B, the output of the preamplifier 34A of the recording function is connected only to the high pass filter 36A, low pass filter 38A and band pass filter 40A. Instead, these high pass filter 36A and low pass filter 38A outputs 42A and 48A are connected to demodulators 44B and 50B inputs 42B and 48B, respectively, via switches 320 and 322 as shown. Therefore, only the output 226 of the preamplifier 34B is connected to the inputs of the high-pass filter 36B and the low-pass filter 38B of the recording function section.

The switches 320 and 322 are switching circuits controlled by the control unit 22B, and when reading the video signal recorded on the magnetic disk 12 of the deck unit 10B, the connection state shown in the drawing is used.
Further, when recording the video signal recorded on the magnetic disk 12 of the deck section 10A, the connection state opposite to that shown in the drawing is switched. The control unit 22A of the reproduction function unit and the recording function unit 22B are connected to each other by a bus 325, and data such as DPSK data can be exchanged between the control units 22A and 22B.

As can be seen from such a configuration, in the present embodiment, the video signal read from the magnetic disk 12 of the reproduction deck section 10A is transferred to the recording function section in the form of the composite luminance signal Y + S and the color difference signal C and recorded. Magnetic disk 12 in deck section 10B
Recorded in. The DPSK signal is received as a data signal by the control unit 22A and transferred to the control unit 22B via the bus 325.

It should be noted that the embodiments described here are for explaining the present invention, and the present invention is not necessarily limited thereto, and variations and modifications that can be made by those skilled in the art without departing from the spirit of the present invention and Modifications are within the scope of the invention. For example, the magnetic recording medium is not limited to only the magnetic disk as described in the illustrated embodiment, but may be advantageously applied to other recording media such as a magnetic tape or a magnetic drum.

Effect According to the present invention, the video signal to be dubbed is thus transferred from the reproducing section to the recording section in a form with less signal deterioration such as a radio frequency signal. Therefore, even if a special circuit for emphasis compensation or the like is not provided, the image quality of the recorded image is less deteriorated. As a result, the frames recorded on the magnetic recording medium can be edited without degrading the image quality.
Also, dubbing from one recorded magnetic recording medium to a plurality of unrecorded magnetic recording media can be effectively realized.

[Brief description of drawings]

1A to 1C are schematic block diagrams showing an embodiment of a video signal recording medium duplicating apparatus according to the present invention, and FIGS. 2A and 2B are schematic block diagrams partially showing another embodiment of the present invention. It is a figure. Explanation of symbols of main parts 10A …… Playback deck section 10B …… Recording deck section 12 …… Magnetic disk 20A, 20B …… Servo circuit 22A, 22B …… Control section 36A, 246 …… High-pass filter 40A, 292 …… Band-pass filter 44A, 50B …… FM demodulator 106A, 106B …… Synchronous separation circuit 152,156 …… FM modulator 204A, 204B …… DPSK demodulator 210A, 210B …… Monitor device 240 …… Delay circuit 242,244 …… Limiter 248,278… … F characteristic correction circuit 288 …… DPSK modulator 304 …… Mixer

Claims (5)

[Claims] 1. A modulation video signal is read from a first magnetic recording medium on which a modulation video signal including a signal modulated by a luminance signal and a color signal and a DPSK modulation signal modulated by a data signal is recorded. In a video signal recording medium duplicating apparatus for recording the same on a second magnetic recording medium, the apparatus drives the first magnetic recording medium to read the modulated video signal from the first recording medium, Driving means for driving the second magnetic recording medium in synchronism with the driving of the first magnetic recording medium, and an FM modulated with a luminance signal from the read modulated video signal.
Separation means for separating the modulation signal, the FM modulation signal modulated with the chrominance signal, and the DPSK modulation signal modulated with the data signal, and a first limiter for limiting the level of the FM modulation signal modulated with the separated luminance signal. Limiter means, second limiter means for limiting the level of the FM modulated signal modulated by the separated color signal, and first limiter means for correcting the frequency characteristic of the FM modulated signal modulated by the level limited luminance signal 1 frequency characteristic correcting means, 2nd frequency characteristic correcting means for correcting the frequency characteristic of the FM modulated signal modulated by the level limited color signal, and modulating means for DPSK modulating the data signal, And a recording means for superimposing the DPSK-modulated data signal on the luminance signal and the chrominance signal when synthesizing the luminance signal and the chrominance signal respectively output from the second frequency characteristic correcting means. Video signal recording medium duplicator to. 2. The apparatus according to claim 1, wherein the apparatus includes delay means for delaying the FM modulation signal modulated by the separated luminance signal for a predetermined time, and the predetermined time is A copying apparatus, wherein the length is set to compensate for a difference in time delay between signals generated in a circuit system including the first and second frequency characteristic correcting means. 3. The apparatus according to claim 1, wherein the reproducing means constitutes a reproducing function section, and all the means other than the reproducing means constitute a recording function section. A copying apparatus, wherein the modulated video signal is transferred to the recording function unit. 4. The apparatus according to claim 1, wherein the reproducing means and the separating means constitute a reproducing function section, and all the means other than the reproducing means and the separating means constitute a recording function section. A reproducing apparatus, wherein an FM modulation signal modulated with the separated luminance signal and an FM modulation signal modulated with a color signal are transferred from the reproduction function unit to the recording function unit. 5. A copying apparatus according to claim 1, wherein the first and second magnetic recording media include magnetic disks.