JPH1169297A - Magnetic recording method, magnetic recorder, magnetic record medium and magnetic transcription method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To record a digital signal, even at a low frequency band below a prescribed frequency by making disturbances on a color signal in an analog video signal inconspicuous. SOLUTION: Tracks are formed in the order of tracks Tf11, Ta11, Ta12, Td11, Tf12, Ta13, Td12,.... An FM audio signal is recorded on the tracks Tf11-Tf13, and an analog video signal is recorded on the tracks Ta11-Ta13 overwritten on the tracks Tf11-Tf13 and reproduced by a VTR of an existing VHS (registered trademark) method. A digital information signal whose periodicity is eliminated is recorded on the tracks Td11-Td13 overwritten on the Ta11-Ta13. Since a magnetic tape 11 is an S-VHS tape, a large recording current is recorded on this tape in comparison to that of a conventional VHS tape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a magnetic recording method, a magnetic recording apparatus, a magnetic recording medium, and a magnetic transfer method.
In particular, the present invention relates to a magnetic recording method, a magnetic recording device, a magnetic recording medium, and a magnetic transfer method capable of selectively recording an analog information signal and a digital information signal.

[0002]

2. Description of the Related Art Conventionally, a magnetic recording method for recording an analog video signal and a digital video signal on the same magnetic tape has been known (Japanese Patent Application Laid-Open Nos. 61-39784 and 6-14343). . In these conventional magnetic recording methods, an analog video signal recording head forms an analog video track on a magnetic tape, which is a magnetic recording medium, and records an analog video signal. A digital video signal is to be recorded on an analog video track by a digital video signal recording head having a different angle.

[0003] Common to these conventional magnetic recording methods is that a digital video signal has a smaller recording current than an analog video signal, or has a smaller recording gap width and a smaller recording depth to provide an analog video track. A digital video signal is to be recorded on the video. Further, in these conventional magnetic recording methods, interference in a common frequency band between an analog video signal and a digital video signal is reduced by azimuth loss due to different azimuth angles.

[0004]

However, means for utilizing a low frequency range for reducing interference due to azimuth loss as a common frequency range is not described in the inventions described in the above two patent publications. Kaisho 61-3978
No. 4 discloses recording digital signals in a band of 6 MHz to 8 MHz, and Japanese Patent Application Laid-Open No. 6-14343 discloses recording digital image signals in a band of 2.3 MHz to 12 MHz. It's just that.
In fact, if the lower frequency band is shared by the digital signal and the analog video signal, the crosstalk cannot be ignored.Especially, the interference to the low-frequency converted color signal will cause color beat interference, which will significantly impair the reproduction quality. It has been known.

[0005] For this reason, the digital signal is 2.
Recording and reproduction are to be performed in a frequency band of 3 MHz or more. This 2.3 MHz is equivalent to 4.6 Mbps in terms of digital data amount, and the restriction on the recording lower limit frequency significantly reduces the recording capacity. Has the consequences.

Further, conventionally, the well-known VHS (registered trademark)
A magnetic tape on which an analog video signal is recorded by a VTR of a TV system and a tape on which a digital signal is recorded by a digital-compatible satellite broadcast set-top box (IRD) or a digital television receiver (DTV) However, even if they are the same, they are completely different magnetic tapes, and there is a problem that the cost of manufacturing the recorded tape is uneconomical.

[0007] The present invention has been made in view of the above points,
Make interference with color signals in analog video signals less noticeable,
It is another object of the present invention to provide a magnetic recording method, a magnetic recording apparatus, and a magnetic transfer method capable of recording a digital signal even in a low frequency band equal to or lower than a predetermined frequency.

Another object of the present invention is to switch to a digital-compatible satellite broadcast set-top box (IRD) or digital-compatible television receiver (DTV) that can be reproduced by an existing analog video signal recording / reproducing device. It is another object of the present invention to provide a magnetic recording medium and a magnetic transfer method that allow a user to view a video signal of higher image quality.

Still another object of the present invention is to arbitrarily select, on a reproducing side, an analog video signal accompanied by a high-sound quality Hi-Fi audio signal and a high-quality digital video signal accompanied by a high-sound quality Hi-Fi audio signal. It is an object of the present invention to provide a magnetic recording method, a magnetic recording device, and a magnetic transfer method for recording data on one magnetic recording medium so that the data can be reproduced.

[0010]

In order to achieve the above object, a recording method according to the present invention comprises a first and a second recording medium having different azimuth angles which are attached to a rotating surface of a rotating body and face each other at the same height. A first recording method in which an audio signal of a predetermined signal form is recorded on a magnetic recording medium running at a constant speed while being wound obliquely over a predetermined angle range around the outer peripheral side surface of the rotating body by using the two rotating heads alternately. , The first and second rotary heads have different azimuth angles from the first and second rotary heads and have different azimuth angles from each other. In a magnetic recording method in which a second track on which an analog video signal is recorded is sequentially overwritten on a first track by third and fourth rotary heads mounted at predetermined height positions different from the third and fourth rotary heads, The azimuth angles are different from those of the fourth rotary head, and the azimuth angles are different from each other. The azimuth angles are different from those of the first to fourth rotary heads. The fifth track and the sixth rotary head overwrite the first and second tracks with the third track in which the digital information signal having a wider band than the analog video signal and in which the periodicity of the recording waveform is removed is recorded. It is to be formed.

Further, the recording apparatus of the present invention alternately uses first and second rotary heads having different azimuth angles attached to the rotating surface of the rotating body and opposed to each other at the same height. After forming a first track on which a sound signal of a predetermined signal form is recorded on a magnetic recording medium running at a constant speed while being obliquely wound over a predetermined angle range on the outer peripheral side surface of the rotating body, the first and second tracks are formed. The azimuth angles are different from those of the second rotating heads, and the azimuth angles are different from each other. The rotating heads are mounted at predetermined height positions different from the first and second rotating heads, facing the rotating surface of the rotating body. Third
In a magnetic recording apparatus in which the second track on which an analog video signal is recorded is sequentially overwritten on the first track by the fourth rotary head, the azimuth angle differs from that of the third and fourth rotary heads. The azimuth angles are also different from each other.
The fifth and sixth rotary heads mounted at predetermined height positions different from the fourth rotary head, and a digital information signal having a wider band than the analog video signal in a predetermined data block unit and having a periodicity. Recording digital signal generating means having a removed waveform, wherein the third track on which the digital information signal generated by the recording digital signal generating means is recorded is overwritten on the first and second tracks. Things.

In the magnetic recording method and the magnetic recording apparatus of the present invention, the third track (digital information signal recording track) has an azimuth angle different from that of the analog video signal reproducing rotary head. The digital information signal is hardly reproduced by the rotary head for signal reproduction, and the reproduced digital information signal is recorded so as to have no periodicity. Therefore, interference with the reproduced analog video signal can be almost ignored. On the other hand, the first track (the audio signal recording track in a predetermined signal form) and the second track (the analog video signal recording track) have an azimuth angle different from that of the digital information signal reproducing rotary head, so that the azimuth loss Accordingly, only the digital information signal can be reproduced by the rotary head for reproducing the digital information signal.

In the third track, the track boundary between two adjacent second tracks is formed at a position included in the track width. The impact can be minimized.

Further, in the apparatus of the present invention, the magnetic recording medium is a magnetic tape having a higher performance than a standard magnetic tape for recording and reproducing an audio signal and an analog video signal, and the audio signal and the analog video signal are each of an existing standard format. A magnetic recording apparatus for recording in a signal form on a first and a second track, wherein a level of an analog video signal recorded by a third and a fourth rotary head is a standard for recording and reproducing an audio signal and an analog video signal. A level control means for controlling the level to be larger than when recording on a magnetic tape is provided. According to the present invention, it is possible to compensate for a decrease in the reproduction output of the second track due to the overwrite recording of the third track.

In the magnetic recording medium of the present invention, the longitudinal direction is inclined with respect to the medium running direction, and the first tracks formed sequentially so that the azimuth angles of adjacent tracks are different from each other. The frequency-modulated audio signal is recorded, and the second track is overwritten on the first track so that the azimuth angle differs from that of the first track, and the azimuth angles of adjacent tracks also differ from each other. In the track, an analog video signal obtained by frequency-division-multiplexing the low-frequency conversion carrier chrominance signal on the low-frequency side of the frequency-modulated luminance signal is recorded, and the azimuth angle differs from the first and second tracks, respectively. And the first and second azimuth angles of adjacent tracks are also different from each other.
A third track overwritten on the track of
A digital information signal having a wider band than an analog video signal and from which periodicity of a recording waveform is removed is recorded.

In the present invention, the audio signal is reproduced from the first track and the analog video signal is reproduced from the second track together with the Hi-Fi audio in the existing analog video signal format, or the digital information is reproduced from the third track. Since it is possible to select whether to reproduce the signal, a pre-recorded tape for an analog video signal and a pre-recorded tape for a digital information signal in an existing format can be simultaneously manufactured on one magnetic recording medium.

Further, in the magnetic transfer method of the present invention, the magnetic pattern is transferred to the slave tape by using a master tape having a magnetic pattern mirror-symmetric to the magnetic pattern of the magnetic recording medium.

[0018]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a rotary head arrangement according to a first embodiment of the present invention. As shown in the plan view of FIG. 1A, the rotating drum 10 is a cylindrical rotating body that rotates at, for example, 30 rps or 29.97 rps by a motor (not shown) in a counterclockwise direction in the drawing, and is a known VHS (registered). Trademark)
The diameter is the same as the diameter of the rotating drum standardized by the method. On the outer peripheral side surface of the rotating drum 10, over an angle range slightly larger than 180 ° of the rotating drum 10,
A magnetic tape 11 is provided diagonally below the guide poles 12 and 13 and the rotating drum 10 (in a direction perpendicular to the paper surface).
The rotary drum 10 is wound by being guided by a tape guide formed on a fixed drum (not shown) which is arranged to be opposed to and separated from the rotating drum 10. The magnetic tape 11 runs at a constant speed in a predetermined direction during recording while maintaining the wound state.

On the rotating surface of the rotary drum 10, rotary heads A1 and A2 for recording analog video signals having different azimuth angles are mounted 180 ° adjacent to each other (that is, opposed to each other). Further, digital video signal recording rotary heads D1 and D2 having different azimuth angles are attached to the rotary surface of the rotary drum 10 so as to be 180 ° adjacent to each other (that is, opposed to each other). The rotary head A1 is mounted on the rotary head D2, and the rotary head A2 is mounted on the rotary head D1 in advance of the angle θ in the rotation direction. The rotating head A
The azimuth angles of 1 and A2 are + 6 ° and -6 ° standardized by the VHS (registered trademark) method, and those of the rotary heads D1 and D2 are + 30 ° and -30 °.

Further, as shown in a development view for explaining the attached state of the rotary head in FIG. 1B, the rotary heads A1 and A2
Have a track width of 58 μm, and are mounted on the rotating drum 10 at the same height. Further, the rotary heads D1 and D2 each have a track width of 29 μm, are at the same height position, and are lower than the rotary heads A1 and A2 by a predetermined height d for forming a track pattern described later. Is attached to the rotating drum 10 at a height position. Incidentally, the height d is (58θ / 18)
0) + (29/2) [μm].

FIG. 2 shows a truck according to the first embodiment of the present invention.
Shows the pattern In the figure, on a magnetic tape 11
Is the head scanning direction b inclined with respect to the tape running direction a.
Along the two rotary heads for recording the two analog video signals.
A1 and A2 alternately record analog video signal recording tracks.
Cook T a1, T a2, T a3, T a4,. . . Sequentially
Formed for recording the two digital video signals.
Digital video signals are alternately rotated by rotating heads D1 and D2.
No. recording track T d1, T d2, T d3,. . . Is sequential
Formed. Note that T d1, T d2, T d3,. . .
Not only digital video signals, but also audio signals
And various other information are multiplexed and recorded at the same time.
The digital video signal is recorded even if the
Above, a digital video signal recording track
You.

As can be seen from FIG.
Image signal recording track T a1, T a2, T a3, T a
4,. . . Is formed without a guard band.
Video signal recording tracks Td1, Td2, Td
3,. . . Indicates that two tracks are located near the center of the track width.
Of the analog video signal recording track
Recorded. For example, digital video signal
The recording track Td1 is an analog video signal recording track T
formed at a position including the track boundary between a1 and Ta2.
ing.

These digital video signal recording tracks
Td1, Td2, Td3,. . . Is an analog video signal
Recording track T a1, T a2, T a3, T a4,. . .
Overwritten at the position including each track boundary
You. That is, for example, analog video is
Image signal recording track T After a1 is recorded and formed,
A2, the analog video signal recording track T a2 is
The track is formed adjacent to the track Ta1.
After the formation of Ta2, the rotary head D1 continuously moves the truck.
The boundary between the tracks Ta1 and Ta2 is almost at the center of the track width.
A track Td1 as a portion is formed.

After the formation of the analog video signal recording track Ta2, an analog video signal recording track Ta3 is recorded next to the track Ta2 by the rotary head A1, and the rotary head D2 is formed during the recording of the track Ta3.
As a result, a digital track Td2 having the boundary between the tracks Ta2 and Ta3 substantially at the center of the track width is formed. Similarly, other digital video signal recording tracks are formed by overwriting the positions including the track boundaries of two adjacent analog video signal recording tracks.

Rotating head A1 for recording analog video signals
And A2 are analog video signal recording tracks T a1, T a
2, T a3, T a4,. . . Analog video signals to be recorded on
No. is the International Electrotechnical Commission (IEC)
IEC744-1 of trotechnical Commision)
Standard format, so-called VHS format
Is recorded. This VHS format corresponds to the format shown in FIG.
As indicated by I in the wave number spectrum, the carrier shift frequency
Is modulated so that is between 3.4 MHz and 4.4 MHz.
Luminance signal (ie, frequency modulated luminance signal)
And the carrier chrominance signal of the color subcarrier frequency 3.58 MHz is low.
Low-frequency transform converted to 629 kHz
This is a frequency division multiplexed signal composed of the replacement carrier chrominance signal II.

The rotary heads D1 and D2 for recording digital video signals are provided with digital video signal recording tracks T.
d1, Td2, Td3,. . . The digital video signal to be recorded is a digital signal having a frequency band of 9.6 MHz as shown in the frequency spectrum of FIG. 3 (B), and is a scrambled data as will be described later. Is the signal from which.

Here, the magnetic tape 11 used as a recording medium on which the analog video signal and the digital video signal are recorded is a high-performance tape defined in the well-known IEC744-3, and is a so-called S-VHS. It is a tape. This S-VHS tape has a coercive force of normal VH
8 higher than that of S tape (standard magnetic tape for recording and reproducing audio signals and analog video signals)
Since it is a magnetic tape of 50 Oe, it is possible to record with a larger recording current than that of a normal VHS tape.
The reproduction output of the analog video signal in the format can be increased, and the output reduction due to the overwriting of the digital video signal can be reduced.

According to this embodiment, Japanese Patent Laid-Open No.
It is possible to make the reproduction quality deterioration of the digital video signal smaller than the invention described in Japanese Patent No. 14343. That is, V
In the compatible reproduction of the TR, some track deviation usually occurs due to track bending, head mounting deviation, and the like. In this case, according to the invention described in JP-A-6-14343, the digital video signal recording track is
(A), as shown by 51, the overwriting is performed at the center position of the analog video signal recording track, so that the portion of the analog video signal recording track that is not overwritten and scanned by the rotating head is caused by track deviation. In the case where the head scanning trajectory indicated by a dashed line is drawn in FIG. 7A, the portion indicated by the oblique line 52 in FIG. All the digital video signal recording tracks are scanned.

On the other hand, in this embodiment, the digital video signal recording tracks are shown in FIG.
As shown in the figure, since the track is formed at the position including the track boundary between the two analog video signal recording tracks, the track portion of the analog video signal recording track which is not overwritten by the digital video signal is shown in FIG. A portion 56 shown by oblique lines in B) is located at the center of the track. Therefore, even when the head scanning trajectory indicated by the one-dot chain line is drawn by the track deviation, the portion 56 is almost scanned by the rotating head, and the track portion not scanned by the rotating head can be used as the digital video signal recording track portion.

Therefore, in the present embodiment, the area of the analog video signal recording track portion which is not overwritten and which is scanned by the rotary head can be made larger than in the prior art, and the digital video signal can be scrambled as described later. Data and the periodicity of the recording waveform has been removed.
It is possible to reduce the beat disturbance due to the digital video signal and reduce the degradation of the analog video quality.

Most of the ordinary VTRs use a head having a track width smaller than the track pitch in the VHS standard mode.
The deterioration of the reproduction quality can be further reduced as compared with the conventional invention described in Japanese Patent Application Laid-Open No. 3 (1993) -316. Further, since the digital video signal recording track is overwritten at the position including the track boundary between the analog video signal recording track and the adjacent analog video signal recording track, the reproduction output of the overwritten portion of the analog video signal recording track is not obtained. As a result, the crosstalk reproduction output of the adjacent analog video signal recording track with respect to the reproduced analog video signal from the analog video signal recording track is reduced. Can be played with higher quality.

Next, a first embodiment of the magnetic recording apparatus according to the present invention will be described. The first embodiment of the magnetic recording apparatus according to the present invention has an analog video signal recording system shown in the block diagram of FIG. 5 and a digital video signal recording system shown in the block diagram of FIG. Two recording systems operate simultaneously in one magnetic recording apparatus.

First, the analog video signal recording system will be described with reference to FIG. 5.
Hz multiplexed with carrier chrominance signal
The C-system color video signal is supplied to a VHS signal processing circuit 21, where the luminance signal and the carrier chrominance signal are separated,
The luminance signal is frequency-modulated so that the carrier shift frequency is 3.4 MHz to 4.4 MHz as indicated by I in FIG.
The carrier chrominance signal has a chrominance subcarrier frequency of 629 k as indicated by II in FIG.
The frequency is converted into a low-frequency conversion carrier color signal of Hz, and the converted color signal is supplied to the level control mixing circuit 22.

The level control mixing circuit 22 is connected via a terminal 23 to an existing VHS (registered trademark) recording or
A mode control signal indicating whether the analog video signal and the digital video signal are simultaneously recorded according to the present embodiment is supplied. In the latter case, the level of the input frequency-modulated luminance signal and carrier color signal is set to be higher than the former. Perform frequency division multiplexing. Thus, the frequency division multiplexed signal (ie, analog video signal) of the frequency spectrum shown in FIG. 3A output from the level control mixing circuit 22 is amplified to a required level by the recording amplifier 24, and Is recorded on the magnetic tape 26 by the rotary head A via the.

Here, the magnetic tape 26 is an S-VHS tape.
And corresponds to the magnetic tape 11. Also rotate
Head A is a rotary head for recording analog video signals shown in FIG.
A1 and A2, and for convenience of illustration, a rotary
As in the case of the transformer 25, only one is shown as a representative. Obedience
Thus, as shown in FIG.
Analog video signal recording track T a1, T a2, T a3,
T a4,. . . Are sequentially formed.

Next, the digital video signal recording system will be described. In FIG. 6, MPEG2
A video signal (which may include an audio signal) supplied to the encoder 31 is a known MPEG (Moving Picture E).
xperts Group).
D-VH in PEG transport stream signal format
It is supplied to the S encoder 32. Here, the video signal input to the terminal 30 is a progressive scanning signal having the same contents as the video signal input to the terminal 20 in FIG.

After an error correction code (ECC) is added in the D-VHS encoder 32, a signal in a data block unit of a predetermined format is used to record a predetermined number of data blocks (sync blocks described later) on sequential tracks. Is supplied to an exclusive OR circuit 33, where the bits corresponding to the M-sequence signal, which is a pseudo-random code from the M-sequence signal generator 34, are subjected to an exclusive-OR operation. Is scrambled. Thereby, the periodicity existing in the data is removed. At this time, the M-sequence signal generator 34
The initial value of is loaded with the address of each data block from the address generator 35. Even if the data is the same, the data is different for each data block, so that the periodicity can be eliminated.

The output digital data of the exclusive OR circuit 33 is supplied to a data selector 38, where the digital data is time-sequentially combined with the sync pattern generated by the sync pattern generator 36 and the amble pattern generated by the amble pattern generator 37. After being combined, the signal is supplied to a modulator 39 and modulated by a predetermined modulation method. Here, the modulator 39 is, for example, a scrambled interleaved NRZI (non-return-to-inverted).
The input digital signal is subjected to a scrambled interleaved NRZI process to obtain recording data. Thus, only the sync pattern in the input digital signal is the same pattern, but the periodicity of the sync pattern is also removed.

FIG. 7 shows a scrambled interleaved NR.
FIG. 2 shows a block diagram of an example of a ZI processing circuit. In the figure, the input data is subjected to exclusive OR operation with the value from the 1-bit register 45 by the adder 43 and output, while being fed back to the register 45 via the 1-bit register 44. Here, when the first bit of the sync pattern is input to the adder 43, the registers 45 and 44 hold the two bits T1 and T2 immediately before the sync pattern. Since there are four combinations of the values of the two bits T1 and T2, the output patterns are as shown in Table 1 according to the values of the two bits T1 and T2 even if the input sync pattern is the same, for example, "1011". Four types are obtained.

[0041]

[Table 1] Since the two-bit value immediately before the sync pattern is not always the same, the periodicity of the sync pattern is also removed from the sync pattern according to the two-bit value immediately before. The value of 2 bits immediately before the sync pattern is regarded as invalid data,
By controlling the value of the bit, it is possible to positively remove the periodicity.

Returning to FIG. 6, the modulator 39
Digitally modulated and extracted as above
The signal is amplified to a required level by the recording amplifier 40.
After that, the rotary head D is connected to the rotary head D via the rotary transformer 41.
This is recorded on the magnetic tape 26. Where the magnetic tape
26 is an S-VHS tape as described with reference to FIG.
And corresponds to the magnetic tape 11. Also, the rotating head
D is a rotary head for recording digital video signals shown in FIG.
D1 and D2, and for convenience of illustration,
As in the case of the lance 41, only one is shown as a representative. Follow
As shown in FIG.
Digital video signal recording track T d1, T d2, T d3,
T d4,. . . Are sequentially formed.

In each of the digital video signal recording tracks, a fixed amount of data area called a sync block corresponding to a data block is provided with a rotating head D (D1, D1).
It is constituted by arranging a plurality in accordance with the scanning of 2). FIG. 8 shows an example format of this sync block. As shown in the figure, the sync block is a 2-byte synchronization signal (Sync) for reproducing the sync block.
Area 61, a 3-byte address information (ID) area 62, a 3-byte header storage area 63 for storing various information, and a 96-byte substantial data storage area 64
And an 8-byte parity area 65 for error correction of the information of the sync block are combined in a time series to form a total of 112 bytes.

FIG. 9 shows an example of the track format of each of the digital video signal recording tracks on the magnetic tape 26. As shown in the figure, one track includes a margin area 71, a preamble area 72, a subcode area 73, a postamble area 74, and an IBG area 7.
5, a preamble area 76, a main data area 77, an error correction code area 78, a postamble area 79, and a margin area 80, and are composed of 356 sync blocks in total.

Of the main data area 77 and the error correction code area 78, the main data area 77 is set to, for example, 306 sync blocks which is a multiple of 6 sync blocks.
The error correction code area 78 is an area where an outer code (C2 code) for error correction is recorded, and is composed of 30 sync blocks. Here, 60 digital video signal recording tracks are formed on the magnetic tape 26 per second, and a digital information signal of 356 sync blocks is recorded on each inclined track together with a header and the like, as described above. Since the block is 112 bytes, the recording data rate is 19.138560 (= 356 × 60).
× 112 × 8 ÷ 10 ⁶ ) Mbps. This is approximately 9.6 (≒ 1) in the frequency band as shown in FIG.
9.138560 / 2) MHz.

As described with reference to FIGS. 1 and 2, the magnetic head 26 shown in FIGS. 5 and 6 has the rotary head A (A1, A1).
According to 2), the analog video signal recording tracks in which the analog video signal of the frequency spectrum shown in FIG. 3A is recorded over the deep portion of the magnetic layer of the magnetic tape 26 are sequentially recorded, and adjacent analog video signal tracks are recorded. After the formation of the two analog video signal recording tracks, the digital video signal having the frequency spectrum shown in FIG. 3B tracks the track boundary between two adjacent analog video signal recording tracks in the track format shown in FIG. A digital video signal recording track overwritten on the surface layer of the magnetic tape 26 is formed so that the center of the width is located substantially.

Therefore, the analog video signal remains in the deep portion of the magnetic layer of the tape portion where the digital video signal recording track is formed without being erased by overwriting the digital video signal. The analog video signal can be reproduced from the digital video signal recording track portion by the signal reproducing rotary head.

The magnetic tape recorded in this manner is
D-VHS or existing VHS (registered trademark) type V
It can be reproduced by TR. During reproduction of an existing VHS (registered trademark) type VTR, the digital video signal recording track has an azimuth angle greatly different from that of the analog video signal reproduction rotary head. Since the video signal is hardly reproduced, and the reproduced digital video signal is recorded so as to have no periodicity, interference with the reproduced analog video signal can be almost ignored, and the analog video signal reduces the recording current. Since the recording is performed at a high level, the reproduction output level of the analog video signal itself is also high, so that a decrease in the reproduction output due to the overwriting can be compensated.

On the other hand, at the time of reproduction by D-VHS, since the digital video signal recorded on the digital video signal recording track can substantially suppress the interference with the analog video signal, the frequency spectrum is shown in FIG. As described above, the information can be reproduced in the same band as the analog video track recording information of a higher image quality and a higher sound quality than the conventional one, because the bandwidth can be made much wider than that of the conventional one and the amount of information is large.

Next, a second embodiment of the present invention will be described. FIG. 10 shows a rotary head arrangement according to the second embodiment of the present invention. In the figure, the same components as those of FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. As shown in the plan view of FIG. 10A, the rotating drum 90 is rotated counterclockwise by a motor (not shown), for example, at 30 rps or 2 rps.
This is a cylindrical rotating body that rotates at 9.97 rps, and has the same diameter as the diameter of the rotating drum 10. Magnetic tape 11
Is obliquely wound on the outer peripheral side surface of the rotating drum 90 over an angle range slightly larger than 180 ° of the rotating drum 90, and at the time of recording, the recording medium is run at a constant speed in a predetermined direction.

On the rotating surface of the rotating drum 90, a rotating head A1 for recording an analog video signal is provided on a rotating head D2 for recording a digital video signal, and a rotating head A2 for recording an analog video signal is provided on a rotating surface. 60 ° in the direction of rotation with respect to the rotary head D1
Installed ahead. Furthermore, on the rotating surface of the rotating drum 90, audio signal recording rotary heads F1 and F2 having different azimuth angles are attached 180 ° adjacent to each other (that is, opposed to each other). Rotating head F1
Is attached to the rotary head A1, and the rotary head F2 is attached to the rotary head A2 ahead of the rotary direction by an angle of 60 °.

The azimuth angles of the rotary heads F1 and F2 are + 30 ° and -30 °. That is, since the azimuth angle of the rotary head F1 is the same as that of the rotary head D1, and the azimuth angle of the rotary head F2 is the same as that of the rotary head D2, it is not necessary to prepare many types of rotary heads having different azimuth angles. This is advantageous in terms of reduction.

Further, as shown in the development view for explaining the attached state of the rotary head in FIG. 10B, the rotary heads F1 and F
Numeral 2 has a track width of 39 μm, is at the same height position, and has a predetermined height 3 with respect to the rotary heads A1 and A2 for forming a track pattern described later.
It is attached to the rotating drum 90 at a height of 8 μm above. Further, the rotary heads D1 and D2 each have a track width of 29 μm, are at the same height position, and have a predetermined height of 34 μm with respect to the rotary heads A1 and A2 for forming a track pattern described later. It is attached to the rotating drum 90 at a lower height position.

FIG. 11 shows a truck according to a second embodiment of the present invention.
2 shows a check pattern. In the figure, on the magnetic tape 11
Is the head scanning direction inclined with respect to the tape running direction a.
b, as in the first embodiment, the two
By the rotary heads A1 and A2 for recording the analog video signal,
The analog video signal recording track is alternately T a11, T a
12, T a13 are formed sequentially in the order of
Digital video signal recording rotary heads D1 and D2
Thus, the digital video signal recording tracks are alternately T d1
1, Td12 and Td13 are formed in this order.

Further, in this embodiment, the recording tracks of the audio signals (ie, FM audio signals) alternately frequency-modulated by the two rotary heads F1 and F2 for recording the audio signals have Tf11, Tf12 and Tf13. It is formed sequentially in order. Note that Td11, Td12, Td13
In this case, not only a digital video signal but also an audio signal and various other information are usually multiplexed and recorded. However, since at least the digital video signal is recorded, it is referred to as a digital video signal recording track for convenience.

As can be seen from FIG. 11, the analog video signal recording tracks Ta11, Ta12 and Ta13 are formed at a track pitch of 58 μm without guard bands. Digital video signal recording tracks Td11, Td
12, Td13 is recorded and formed such that a substantially central portion of a track width of 29 μm is located at a track boundary between two adjacent analog video signal recording tracks. Further, FM audio signal recording tracks Tf11, Tf12, T
In f13, the track width is 39 μm, and the lower ends of the tracks are analog video signal recording tracks Ta11, Ta1.
2, formed to coincide with the lower end of Ta13.

Next, the order of forming these recording tracks will be described in detail. First, for example, an FM audio signal recording track Tf11 is recorded and formed by the rotary head F1.
As shown in the frequency spectrum of FIG. 13A, the recording track Tf11 includes a first FM audio signal III having a carrier frequency of 1.3 MHz and a carrier frequency of 1.7 MHz.
And the second FM audio signal IV. The frequency division multiplex signal (FM audio signal) is recorded mainly in the deep portion of the magnetic layer of the magnetic tape 11 because the frequency band is in the low frequency band.

Subsequently, an analog image is displayed by the rotary head A1.
Image signal recording track T a11 is the FM audio signal recording track
Overwrite recording is formed on the disk Tf11. This recording tiger
The frequency spectrum is shown in FIG.
As shown, the carrier shift frequency is between 3.4 MHz and 4.4.
MHz, and a luminance signal I frequency-modulated to
Low frequency band with subcarrier frequency converted to 629kHz
Frequency-division multiplexed analog signal
The log video signal is recorded at a level higher than usual.

That is, this analog video signal has a frequency
Signals with several bands from low frequency band to relatively high frequency
A relatively deep layer from the surface layer of the magnetic layer of the magnetic tape 11
Recorded down to the part. Therefore, analog video
Signal recording track T a11 is the FM audio signal recording track.
Even if the tape is overwritten on Tf11,
The recorded FM audio signal of the track Tf11
T being erased by the recorded analog video signal of a11
No recording state remains.

Subsequently, the rotary head F2 shown in FIG.
The FM audio signal of the frequency spectrum shown in FIG.
After the recorded recording track Tf12 is recorded and formed,
The frequency spectrum shown in FIG.
Recording track T on which the tram analog video signal is recorded
a12 is formed adjacent to the track Ta11. this
In this case, similarly to the above, the FM audio signal recording track Tf
Twelve recorded FM audio signals are overwritten analog
Video signal recording track T For recording analog video signal of a1
The recorded state remains without being erased.

Next, while the analog video signal recording track Ta12 is being formed, the boundary between the tracks Ta11 and Ta12 is made substantially the center of the track width by the rotary head D1 and the FM audio signal recording track T12 is formed.
At a position that partially overlaps with f11, a track Td11 having an azimuth angle different from that of the FM audio signal recording track Tf11 is overwritten. The recording track Td11 has a frequency spectrum as shown in FIG.
A wide-band digital video signal having a frequency band of about 9.6 MHz is recorded with its periodicity removed in the same manner as in the first embodiment. Therefore, this digital video signal has a higher frequency than other recording signals, and the rotary head D1
In order to set the recording current for wide band recording, the recording current must be smaller than the recording current for the rotary heads A1 and A2 for recording an analog video signal. Therefore, recording is performed mainly on the surface layer of the magnetic layer of the magnetic tape 11. Is done.

Therefore, even if the digital video signal recording track Td11 is overwritten on the FM audio signal recording track Tf11 and the analog video signal recording tracks Ta11 and Ta12, the recorded FM audio signal of the track Tf11 in the deep part of the tape is Of course, track T
The recorded analog video signals a11 and Ta12 also remain in the recorded state without being almost erased.

After the formation of the analog video signal recording track Ta12, the rotary head F1 subsequently forms the FM audio signal recording track Tf13, the rotary head A1 overwrites the analog video signal recording track Ta13 on the track Tf13, and the rotary head D2. Tracks Ta12 and Ta13 of digital video signal recording track Td12
And overwrite formation on Tf12. Hereinafter, the same operation as described above is repeated.

FIG. 12 schematically shows the state of recording on the magnetic layer of the magnetic tape 11 at this time. In the figure, the vertical direction indicates the depth direction of the magnetic tape 11. As can be seen from the figure, the FM audio signal recording tracks Tf11 and Tf12 have an FM audio signal recording area 95 in the deep portion of the magnetic layer, and the analog video signal recording tracks Ta11 and Ta1.
2 has an analog video signal recording area 96 centered on the middle layer of the magnetic layer, and digital video signal recording tracks Td11 and Td12 have a digital video signal recording area 97 on the surface layer of the magnetic layer. Regions 95 to 97 coexist in the magnetic layer.

Here, the rotary heads A1, A2, F
Since the track pattern formed by 1 and F2 is the same as the track pattern of the Hi-Fi audio in the existing VHS VTR, the analog video signal recording track and the FM audio signal recording track are reproduced by the existing VHS VTR. As a result, analog video signals can be reproduced with hi-fi audio. On the other hand, D-VH
During playback by S, the digital video signal recorded on the digital video signal recording track can be almost completely suppressed from interfering with the analog video signal by removing the periodicity. The same information as the video track recording information can be reproduced.

Next, a description will be given of a second embodiment of the magnetic recording apparatus according to the present invention. FIG. 14 is a block diagram showing a second embodiment of the magnetic recording apparatus according to the present invention. In the figure, the same components as those of FIG. 10 are denoted by the same reference numerals, and description thereof will be omitted. 14, this magnetic recording apparatus includes an analog video signal recording system 101, a digital information signal recording system 102, an audio signal recording processing circuit 103,
Recording amplifier 104, rotating heads A1, A2, D1, D
2, F1 and F2.

The analog video signal recording system 101 is the same as the recording system shown in FIG.
13 (B) by the method shown in FIG.
And generates an analog video signal having the frequency spectrum shown in FIG. The digital information signal recording system 102 is the same as the recording system shown in FIG. 6 except that the rotary head D and the magnetic tape 26 are omitted.
The digital information signal (video signal, audio signal and other information) to be recorded in the frequency spectrum shown in FIG. 3 (C) is generated for each sync block shown in FIG. And D2.

Further, the audio signal recording processing circuit 103 performs frequency modulation (FM) on a 1.3 MHz carrier with the first analog audio signal of the input first and second analog audio signals in the baseband. Then, a first FM audio signal having a frequency spectrum indicated by III in FIG. 13A is generated, and a 1.7 MHz carrier is frequency-modulated by the second analog audio signal. After generating a second FM audio signal of the indicated frequency spectrum, both F
A signal obtained by frequency division multiplexing the M audio signal is generated.

This frequency division multiplexed signal is supplied to the recording amplifier 1
After the signal is amplified to a required level by 04, it is supplied to the rotary heads F1 and F2 via a rotary transformer (not shown) and recorded on the magnetic tape 11.

FIG. 15 shows a track pattern according to the third embodiment of the present invention. As shown in the figure, the track patterns of this embodiment include an analog video signal recording track Ta, a digital video signal recording track Td, and an FM video signal recording track Td.
Of the audio signal recording tracks Tf, at least the respective track center lines of the digital video signal recording track Td and the FM audio signal recording track Tf are substantially matched,
In addition, the patterns have different azimuth angles.

If the track center lines of the digital video signal recording track Td and the FM audio signal recording track Tf do not match, for example, when the digital video signal recording track is reproduced, the adjacent FM audio signal recording tracks having the same azimuth angle are also simultaneously recorded. Although the reproduction becomes easier, the track pattern shown in FIG.
The off-track characteristics of the audio signal and the digital signal can be improved.

Next, one embodiment of the magnetic transfer method of the present invention will be described. FIG. 16 is a configuration diagram of a transfer device for explaining an embodiment of the magnetic transfer method of the present invention. When the magnetic surfaces of the master tape and the slave tape are brought into close contact with each other and run in a bias magnetic field, the bias magnetic field acts as an erasing magnetic field on the master tape and acts as an AC bias magnetic field on the slave tape. It is known that the magnetization pattern of a tape can be transferred to a slave tape.

FIG. 16 shows a transfer apparatus utilizing this principle.
A master tape 116 which is unwound from the reel 111, passes through a tape guide 112, a rotating roller 113, and a tape guide 114 and is wound around a reel 115;
17 and passes through the tape guide 118, the bias head 119, and the tape guide 120, and passes through the reel 12.
The slave tape 122 wound around 1 runs in the same direction with its respective magnetic surfaces being in contact with the rotating roller 113 and a non-magnetic cylindrical body (not shown) containing the bias head 119.

The master tape 116 has a magnetic pattern which is mirror-symmetrical to the magnetization pattern of the recording track pattern shown in FIG. 2, 11 or 15 by the master recorder, or the recording track shown in FIG. 2, 11 or 15. This is a so-called mirror tape on which a magnetization pattern of a recording track pattern having no digital information signal recording track and a mirror pattern of a magnetization pattern are recorded in advance. On the other hand, the slave tape 122 is an unrecorded magnetic tape.

The first AC current source 123 outputs a first AC bias current having a frequency f1 at the time of transfer of a signal composed of a conventionally known VHS format analog video signal and FM audio signal. . The second AC current source 124 outputs a second AC bias current having a frequency f2 higher than the frequency f1. The bias current supply circuit 125 selects the first AC bias current and supplies it to the bias head 119 when the recording mode signal input from the terminal 126 is in the normal mode, and supplies the second AC bias current when the recording mode signal is in the digital mode. A bias current is selected and supplied to the bias head 119.

In the normal mode described above, the magnetization pattern of the master tape
Is a magnetization pattern that is mirror-symmetrical to the magnetization pattern of the recording track pattern having no digital information signal recording track from the recording track pattern shown in (1), and is a conventionally known mode for transferring the magnetization pattern to the slave tape 122. On the other hand, in the above-mentioned digital mode, the magnetization pattern of the master tape 116 is shown in FIGS.
1 or a magnetization pattern mirror-symmetric to the recording track pattern shown in FIG. 15, and is a mode unique to the present embodiment in which the magnetization pattern is transferred to the slave tape 122.

The bias head 119 applies an AC bias substantially perpendicularly to a portion where the magnetic surface of the master tape 116 and the magnetic surface of the slave tape 122 are in contact with each other, thereby changing the magnetization pattern of the master tape 116. The image is transferred to the slave tape 122 with mirror symmetry. As a result, an AC bias current having a higher frequency f2 is supplied in the digital mode than in the normal mode, and an AC bias magnetic field generated by the bias head 119 and having a frequency higher than that in the normal mode is applied to the slave tape 122 in FIG. The magnetization pattern of the recording track pattern shown in FIG. 11 or FIG. 15 is transferred.

As described above, according to this embodiment, it is possible to manufacture a slave tape capable of selectively reproducing one of an analog video signal, a hi-fi audio signal, and a digital information signal by one transfer. The manufacturing cost of the tape can be reduced, and the selling cost of the prerecorded tape can be reduced.

In the digital mode, the bias current supply circuit 125 supplies the first AC bias current and the second AC bias current.
And the AC bias current of the bias head 119
To generate an AC bias magnetic field. In the normal mode, the FM audio signal is also recorded together with the analog video signal. However, it is needless to say that only the analog video signal may be recorded.

The present invention is not limited to the above embodiment, and various modifications described below are possible.
For example, the digital video signal recording track has been described to be overwritten so that the track boundary between two adjacent analog video signal recording tracks is located substantially at the center of the track width, but at least the above-mentioned track boundary is included. It is only necessary to overwrite and record at the position shown in FIG. 15 and further, the position shown in FIG.

Although the video signal recorded on the digital video signal recording track has been described as a progressive scanning signal having the same content as the video signal recorded on the analog video signal recording track, the present invention is not limited to this. Interlaced scanning signals having the same contents may be used, or video signals having different contents may be used. In order to view a progressive scanning signal with an existing interlaced scanning monitor receiver, it is necessary to convert the progressive scanning into interlaced scanning, but this conversion is not required in the present invention.

Further, in an apparatus for reproducing a digital video signal recorded on a digital video signal recording track as main information, an analog video signal from an analog video signal recording track is reproduced at a high speed during special reproduction (for example, during a high-speed search). An analog video signal can also be recorded as possible. Further, the magnetic tapes 11, 26
Is a VHS tape having at least a normal coercive force (standard magnetic tape for recording and reproducing audio signals and analog video signals)
Any tape having a coercive force higher than that of 600 Oe may be used, and is not limited to the S-VHS tape.
Further, as a magnetic transfer method, a method of transferring a master tape and a slave tape close to each other is also possible.

[0083]

As described above, according to the present invention,
The following various effects are obtained.

(1) Since the digital information signal is recorded with the periodicity removed, and the interference with the reproduced analog video signal can be almost ignored in combination with the azimuth loss effect, the analog video signal can be recorded without any trouble. At the same time, since a digital information signal having almost no interference with an analog video signal can be recorded on the same magnetic recording medium, a digital information signal having a much wider band can be recorded as compared with the conventional one, and thus the information amount is large, and A digital information signal having higher image quality and higher sound quality can be recorded on a magnetic recording medium on which an analog video signal is recorded.

(2) In the digital information signal recording track, since the track boundary between two adjacent analog video signal recording tracks is formed at a position included in the track width, even if a track deviation occurs due to compatible reproduction. , The effect can be minimized.

(3) Particularly, in an inexpensive reproducing apparatus having a rotating head for recording an analog video signal having a small track width, a high-quality video signal is reproduced because the analog video signal recording track is not divided. Can be.

(4) Using a high-performance magnetic tape having a higher coercive force and a larger MOL than that of a normal magnetic tape and recording an analog video signal at a level higher than the normal level by the level control means, thereby enabling overwrite recording. Can reduce the reproduction output of the analog video signal recording track caused by the analog video signal, so that the analog video signal can be reproduced at a large level from the analog video signal recording track portion that is not overwritten. It is possible to reproduce with higher image quality than before.

(5) Wider band than analog video signal
Also, since the recording track of the digital information signal from which the periodicity of the recording waveform has been removed is overwritten after the formation of the analog video signal recording track, the analog video signal can be selectively reproduced from the analog video signal recording track with high quality. In a device for selectively reproducing digital information signals from a digital information signal recording track with higher quality than before, and reproducing the recorded digital video signal of the digital video signal recording track as main information, during special reproduction (for example, during high-speed search) Thus, a high-speed reproduced image with good image quality can be obtained from the analog video signal recording track.

(6) Since the FM audio signal recording track is formed ahead of the analog video signal recording track and the digital information signal recording track, the FM audio signal recording track is reproduced from the FM audio signal recording track when the analog video signal recording track is reproduced. By reproducing the signal, high-quality Hi-Fi sound can be obtained.

(7) When the FM audio signal recording track is formed before the analog video signal recording track and the digital information signal recording track, respectively, it is reproduced in the existing analog video signal format together with the hi-fi audio, or the digital information signal is reproduced. The prerecorded tape for analog video signals and the prerecorded tape for digital information signals in the existing format can be manufactured simultaneously on a single magnetic recording medium. The manufacturing cost can be reduced as compared with the case of manufacturing at a low cost. Further, a prerecorded tape of an analog video signal and a prerecorded tape of a digital information signal in an existing format can be sold as one prerecorded tape.

(8) Digital image data relating to a progressive scanning progressive video signal is recorded on an analog video signal recording track or on a digital information signal recording track formed together with an analog video signal recording track and an FM audio signal recording track. By doing
It is possible to reproduce not only high-quality progressively scanned images but also conventional analog video signal images without any increase in cost by combining a conventional VTR or monitor receiver.

(9) Digital information signal recording track
By making each track center line of the FM audio signal recording track substantially coincide with the track center line of the analog video signal recording track, the off-track characteristics of the FM audio signal and the digital information signal can be improved.

(10) Since the azimuth angles of, for example, + 30 ° and -30 ° are used as the rotary head for recording the digital information signal and the rotary head for the FM audio signal, the rotary heads having different azimuth angles are manufactured and prepared. The manufacturing cost of the apparatus can be reduced as compared with the case in which it is performed.

(11) Further, the magnetic transfer method of the present invention
An analog video signal recording track is overwritten on the FM audio signal track, and a digital information signal recording track having a wider band than the analog video signal and from which the recording waveform is removed is replaced by an analog video signal recording track. Since the magnetization pattern is transferred to the slave tape using a master tape having a magnetization pattern mirror-symmetric to the overwritten magnetization pattern, the analog video signal, one of the hi-fi audio signal, and the digital information signal can be transferred in one transfer. A slave tape that can be selectively reproduced can be manufactured, which greatly contributes to a reduction in the manufacturing cost of the prerecorded tape and a reduction in the sales cost of the prerecorded tape.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a state in which a rotary head according to a first embodiment of the present invention is mounted on a rotary drum.

FIG. 2 is a diagram showing a track pattern formed according to the first embodiment of the present invention.

FIG. 3 is a diagram showing a frequency spectrum of a signal recorded according to the first embodiment of the present invention.

FIG. 4 is a diagram for explaining the effect of the track deviation by comparing the conventional method and the method of the present invention.

FIG. 5 is a block diagram of an analog video signal recording system of the first embodiment of the magnetic recording apparatus according to the present invention.

FIG. 6 is a block diagram of a digital video signal recording system of the first embodiment of the magnetic recording apparatus according to the present invention.

FIG. 7 is a block diagram of an example of a scrambled interleaved NRZI circuit of a main part in FIG. 6;

FIG. 8 is a diagram illustrating an example of a format of a sync block recorded by the recording system of FIG. 6;

FIG. 9 is a diagram showing an example of a track format of a digital signal recorded by the recording system of FIG.

FIG. 10 is a diagram illustrating a state in which a rotary head according to a second embodiment of the present invention is mounted on a rotary drum.

FIG. 11 is a diagram showing a track pattern formed according to a second embodiment of the present invention.

FIG. 12 is a schematic diagram showing a recording state on a tape magnetic layer of a track formed according to a second embodiment of the present invention.

FIG. 13 is a diagram showing a frequency spectrum of a signal recorded according to the second embodiment of the present invention.

FIG. 14 is a block diagram of a second embodiment of the magnetic recording apparatus according to the present invention.

FIG. 15 is a diagram showing a track pattern formed according to a third embodiment of the present invention.

FIG. 16 is a configuration diagram of a transfer device illustrating an embodiment of a magnetic transfer method according to the present invention.

[Explanation of symbols]

10, 90 rotating drum 11, 26 magnetic tape 20 color video signal input terminal 21 VHS signal processing circuit 22 level control mixing circuit 23 mode control signal input terminal 30 information signal input terminal 31 MPEG2 encoder 32 D-VHS encoder 34 M-sequence signal generator 35 address generator 36 sync pattern generator 37 amble pattern generator 38 data selector 95 FM audio signal recording area 96 analog video signal recording area 97 digital information signal recording area 101 analog video signal recording system 102 digital information signal recording system 103 audio signal recording processing circuit 104 Recording amplifier 113 Rotating roller 116 Master tape 119 Bias head 122 Slave tape 123, 124 AC current source 125 Bias current supply circuit A1, A2, A Rotating head for recording analog video signal D1, D2, D Rotating head for recording digital video signal F1, F2 Rotating head for recording audio signal Ta1, Ta2, Ta3, Ta4, Ta11, Ta1
2, Ta13, Ta Analog video signal recording track Td1, Td2, Td3, Td11, Td12, Td1
3, Td digital video signal recording track Tf11, Tf12, Tf13, Tf FM audio signal recording track

Claims (21)

[Claims] 1. The method according to claim 1, wherein the first and second rotating heads having different azimuth angles are alternately mounted on the rotating surface of the rotating body so as to face each other. After forming a first track on which a sound signal of a predetermined signal form is recorded on a magnetic recording medium which is wound obliquely over a predetermined angle range and travels at a constant speed, the first and second rotary heads are formed. Have different azimuth angles, and have different azimuth angles. The third and the third rotation heads are mounted at predetermined height positions different from the first and second rotating heads opposite to the rotating surface of the rotating body. In a magnetic recording method in which a second track on which an analog video signal is recorded is sequentially overwritten on the first track by a fourth rotating head, the third and fourth rotating heads are each And the azimuth angles are different from each other, and the fifth and sixth heads are mounted at predetermined height positions different from the first to fourth rotating heads opposite to the rotating surface of the rotating body. Forming a third track on which a digital information signal having a wider band than the analog video signal and recording a periodicity of a recording waveform is removed by the rotary head over the first and second tracks. Characteristic magnetic recording method. 2. The magnetic recording medium is a magnetic tape having a higher performance than a standard magnetic tape for recording and reproducing the audio signal and the analog video signal, and the audio signal and the analog video signal respectively have an existing standard format. The signal is recorded on the first and second tracks in the form of a signal, and the level of the analog video signal is controlled to be larger than when recording the audio signal and the analog video signal on a standard magnetic tape for recording and reproduction. 2. The magnetic recording method according to claim 1, wherein recording is performed on the second track. 3. The magnetic field according to claim 1, wherein the third track is formed at a position where a track boundary between two adjacent second tracks is included in a track width. Recording method. 4. The magnetic recording method according to claim 1, wherein the first and third tracks are formed such that respective track center lines substantially coincide with each other. 5. The digital information signal recorded on the third track is a progressive scanning signal having the same content as an analog video signal recorded on the second track. The magnetic recording method according to the above. 6. The fifth rotating head has the same azimuth angle as the first rotating head, the sixth rotating head has the same azimuth angle as the second rotating head, and the fifth rotating head has the same azimuth angle as the second rotating head. The fifth rotating head overwrites the third track on the first track formed by the second rotating head, and the sixth rotating head forms the first track formed by the first rotating head. The third
2. A track is formed by overwriting.
Or the magnetic recording method according to 2. 7. The method according to claim 1, wherein the first and second rotary heads having opposite azimuth angles and mounted at the same height position are opposed to the rotating surface of the rotating body. After forming a first track on which a sound signal of a predetermined signal form is recorded on a magnetic recording medium which is wound obliquely over a predetermined angle range and travels at a constant speed, the first and second rotary heads are formed. Have different azimuth angles, and have different azimuth angles. The third and the third rotation heads are mounted at predetermined height positions different from the first and second rotating heads opposite to the rotating surface of the rotating body. In a magnetic recording device in which a second track on which an analog video signal is recorded is sequentially overwritten on the first track by a fourth rotary head, the third and fourth rotary heads are each And the azimuth angles are different from each other, and the fifth and sixth heads are mounted at predetermined height positions different from the first to fourth rotating heads opposite to the rotating surface of the rotating body. And a recording digital signal generating means for converting a digital information signal of a wider band than the analog video signal into a predetermined data block unit and having a waveform from which periodicity has been removed, the recording digital signal generating means The third track on which the digital information signal generated by
And a second track overwritten on the second track. 8. The magnetic recording medium is a magnetic tape having a higher performance than a standard magnetic tape for recording and reproducing the audio signal and the analog video signal, and the audio signal and the analog video signal are respectively in an existing standard format. A magnetic recording apparatus for recording in a signal form on the first and second tracks, wherein the level of the analog video signal recorded by the third and fourth rotating heads is recorded by the recording of the audio signal and the analog video signal. 8. The magnetic recording apparatus according to claim 7, further comprising level control means for controlling the level to be larger than when recording on a standard magnetic tape for reproduction. 9. The magnetic device according to claim 7, wherein the third track is formed at a position where a track boundary between two adjacent second tracks is included in a track width. Recording device. 10. The magnetic recording apparatus according to claim 7, wherein the first and third tracks are formed such that respective track center lines substantially coincide with each other. 11. The recording digital signal generation means,
9. The magnetic recording apparatus according to claim 7, wherein the digital information signal is subjected to at least scrambled interleaved NRZI processing. 12. The digital video signal recorded by the fifth and sixth rotary heads is a progressive scan signal having the same contents as the analog video signal recorded by the third and fourth rotary heads. 9. The magnetic recording apparatus according to claim 7, wherein 13. The fifth rotating head has the same azimuth angle as the first rotating head, and has a smaller track width than the third and fourth rotating heads.
The magnetic head according to claim 7 or 8, wherein the rotating head has the same azimuth angle as the second rotating head and has a smaller track width than the third and fourth rotating heads. Recording device. 14. An analog video signal recorded by said third and fourth rotary heads is a video signal obtained by frequency-division multiplexing a low-frequency conversion carrier color signal on a low frequency side of a frequency-modulated luminance signal, The recording digital signal generating means includes: a first encoder that obtains a transport stream by compressing and encoding an information signal including at least a video signal in accordance with the MPEG standard; and a data block unit that includes an error correction signal. A second encoder that converts the digital signal into a digital signal, and a periodicity removing unit that removes the periodicity of the output digital signal of the second encoder using a pseudo-random signal and outputs the digital information signal as the digital information signal to be recorded. 9. The magnetic recording apparatus according to claim 7, comprising: 15. A first track having a longitudinal direction inclined with respect to a medium running direction and formed sequentially so that azimuth angles of adjacent tracks are different from each other.
A frequency-modulated audio signal is recorded, and an azimuth angle is different from that of the first track, and an azimuth angle of an adjacent track is different from each other. On the second track, an analog video signal obtained by frequency-division-multiplexing the low-frequency conversion carrier chrominance signal on the low-frequency side of the frequency-modulated luminance signal is recorded, and the azimuth angle differs from that of the first and second tracks. A third track overwritten on the first and second tracks is provided with a wider band than the analog video signal and a recording waveform of the recording waveform so that the azimuth angles of the adjacent tracks are different from each other. A tape-shaped magnetic recording medium on which a digital information signal from which periodicity has been removed is recorded. 16. A tape-shaped magnetic recording medium having a higher performance than a standard magnetic tape for recording and reproducing the audio signal and the analog video signal, wherein the audio signal and the analog video signal each have a signal format of an existing standard format. The analog video signal is recorded on the first and second tracks at a higher level than when the analog video signal is recorded on a standard magnetic tape for recording and reproducing the audio signal and the analog video signal. The magnetic recording medium according to claim 15, wherein the magnetic recording medium is recorded on a track. 17. The third track according to claim 15, wherein a track boundary between two adjacent second tracks is included in a track width.
Or the magnetic recording medium according to 16; 18. The magnetic recording apparatus according to claim 15, wherein the first and third tracks are formed such that respective track center lines substantially coincide with each other. 19. The digital information signal recorded on the third track is a progressive scanning signal having the same content as an analog video signal recorded on the second track. The magnetic recording medium according to the above. 20. A magnetic transfer method for transferring a recording magnetization of the master tape to the slave tape by bringing the master tape into contact with or approaching a slave tape in a state where a bias magnetic field is applied to the master tape. However, a frequency-modulated audio signal is recorded and magnetized on a first track whose longitudinal direction is inclined with respect to the medium traveling direction and the azimuth angles of adjacent tracks are sequentially different from each other. , The azimuth angle of each of the first tracks is different from that of the first track, and the azimuth angles of the adjacent tracks are different from each other.
An analog video signal obtained by frequency-division-multiplexing the low-frequency conversion carrier chrominance signal on the low frequency side of the frequency-modulated luminance signal is recorded and magnetized on the track, and the azimuth angle differs from that of the first and second tracks. A third track overwritten on the first and second tracks is provided with a wider band than the analog video signal and a recording waveform of the recording waveform so that the azimuth angles of the adjacent tracks are different from each other. A magnetic transfer method characterized by having a magnetization pattern mirror-symmetric to a magnetization pattern of a magnetic tape on which a digital information signal from which periodicity has been removed is recorded and magnetized. 21. The magnetic transfer method according to claim 20, wherein the frequency of the bias magnetic field is set higher than when the digital information signal is not included.