JPH03230689A - Magnetic recording and reproducing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a helical scan type magnetic recording and reproducing device, and particularly to a magnetic recording and reproducing device that is capable of recording and reproducing image signals generated at high speed. .

[Conventional technology]

Conventional helical scan magnetic recording/reproducing device (hereinafter referred to as
(VTR) is equipped with a slow-motion playback function, which records one field of video signals on each diagonal track on the magnetic tape, and repeatedly plays each track multiple times. Because the same field of images is displayed multiple times on the monitor, sufficient resolution cannot be obtained for the movement of the image, and There is also a problem that images of fast-moving subjects lack continuity and blur.

On the other hand, in rNHK Giken Monthly Report J Vol, 28 (Showa 60, 4) pp, 19-26, a high-speed video camera was used to obtain high resolution for movement,
A VTR is described that is capable of obtaining slow motion images of high image quality and high resolution.

To briefly explain this conventional technology, when performing 1/3 slow motion playback, a video camera performs horizontal and vertical scanning at three times the speed of the standard method, and the number of scanning lines per field is the standard method. , and the number of fields per second is three times that of the standard method. VT
In R, this image signal is written into three field memories in units of three fields, one field each, and read out after expanding the time axis three times.

According to this, the fields read from each field memory have the same time length as in the standard method, but the read timings from these field memories are sequentially shifted by 173 times the field length in the standard method. Therefore, the fields output from the video camera and
．． 2.3..., every second i-th field is read out from the first field memory with the standard method time length, and the second . From the third field memory, every second (i+1) and (i+2)
)-th field is read out in the same way to obtain a 3-channel video signal.

Furthermore, there are 12 magnetic heads on the head cylinder.
The video signal read from the first field memory is supplied to the first magnetic head, which scans the magnetic tape diagonally at 60 rotations per second. The second magnetic head, which rotates 120 degrees later, receives the video signal read from the second field memory, and the third magnetic head, which rotates further 120 degrees later, receives the video signal read from the third field memory. As a result, one field is recorded on each track on the magnetic tape in the order in which the fields are output from the video camera.

During playback, the running speed of the magnetic tape is set to 1 during recording.
/3 times, and each track is sequentially played back every 1/60 seconds using one magnetic head.

Although slow-motion images can be obtained in this way, the number of counts per second in the video camera is increasing, and VT
In R, since each field is reproduced once, the continuity of fast-moving subject images is good, and high resolution can be obtained in terms of movement, resulting in high-quality, high-resolution slow-motion images.

[Problem to be solved by the invention]

However, the above-mentioned conventional technology requires a field memory etc. for time axis conversion of the field, and also requires a large number of magnetic heads, resulting in a very large and expensive device. The problem is that it can only be used for slow motion recording and lacks versatility. The main focus was on development for broadcasting, and from this point of view, the above is not a particular problem, but it is suitable for consumer VTRs, which are desired to be small, lightweight, and inexpensive. On the other hand, it is extremely difficult to employ the above-mentioned conventional technology.

An object of the present invention is to solve such problems and to record video signals generated at high speed (high-speed video signals) to achieve high image quality.
It is an object of the present invention to provide a magnetic recording and reproducing device that enables high-resolution image reproduction, has a relatively simple configuration, and is inexpensive.

[Failure to solve the problem]

In order to achieve the above object, the present invention inputs, as a recording signal, a high-speed video signal that has N times the number of fields per second, signal frequency, and frequency bandwidth of a standard video signal (where N>1). At this time, the rotational speed of the rotary head and the running speed of the magnetic tape are set to N times the speed when a standard video signal is used as a recording signal.

[For production]

When a high-speed video signal is used as a recording signal, the inclination, length, and pitch of the tracks formed on the magnetic tape are the same as when a standard video signal is used as a recording signal. Furthermore, the field period of the high-speed video signal is 1/N times that of the standard video signal, but the rotational speed of the rotary head is N times that of the standard video signal.
Each track on the magnetic tape records a high-speed video signal for a period similar to that used to record a standard video signal.

Therefore, the recording format on the magnetic tape on which the high-speed video signal is recorded is the same as that on the magnetic tape on which the standard video signal is recorded by the existing standard VTR, and it is possible to play back on the existing standard VTR. /N
It is possible to achieve slow motion playback with twice the resolution.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a configuration diagram showing one embodiment of a magnetic recording and reproducing apparatus according to the present invention, in which ■ is a video camera, 2 is a synchronization separation circuit, 3 is an FM modulation circuit, 4 is a deviation adjustment circuit,
5 is a carrier adjustment circuit, 6°7 is an HPF (bypass filter), 8 is a switch, 9 is a mixing circuit, 1 is a low-pass conversion circuit, 11.12 is an LPF (low-pass filter),
13 is a switch, 14 is an FM modulation circuit, 15 is a deviation adjustment circuit, 1G is a carrier adjustment circuit, 17.18
is LPF, 19 is switch, 20.2i is recording amplifier,
22 is a magnetic tape, 23° and 24 are rotating video, RAD,
25. 26 is a rotating sound head, 27 is a cylinder motor,
28 is a capstan motor, 29 is a servo circuit, 30 is an oscillation circuit, 31 is a control head, and 32 is an input terminal.

Next, the operation of this embodiment will be explained.First, the video camera 1 performs standard operation, outputs a video signal that conforms to the standard system, and performs recording of this video signal as specified by, for example, the VH3 standard. (hereinafter,
This is called normal recording).

In FIG. 1, in this case, a mode instruction signal M of "L" (low level) is input from the input terminal 32 in response to a user's mode instruction. In response to this mode instruction signal M, the video camera 1 performs normal operation, for example, N
A luminance signal Y, a chroma signal C, and an audio signal A in a format defined by the TSC system are output. Also, switch 8.1
3.19 closes on the b side.

The luminance signal Y output from the video camera 1 is supplied to the FM modulation circuit 3, and is FM-modulated using the carrier frequency and deviation determined by the carrier adjustment circuit 5 and the deviation adjustment circuit 4.

In this case, the deviation adjustment circuit 4 and the carrier adjustment circuit 5 are controlled by the L'' mode instruction signal M from the input terminal 32, and for example, the white peak is 3.4 MHz at the leading edge level of the synchronization signal of the luminance signal Y. The carrier frequency and deviation of the FM modulation circuit 3 are set so that the level is 4.4±0.1MHz and conforms to the VHS standard.The FM modulated luminance signal (hereinafter referred to as FM YFM (referred to as luminance signal)
Unnecessary components in the low range are removed by HPF 6 with a cutoff frequency of approximately 1.6 MHz, and then passed through switch 8 to mixer circuit 9.
is supplied to

A chroma signal C output from the video camera 1 is supplied to a low frequency conversion circuit 10. The low frequency conversion circuit 10 is connected to the input terminal 3
The "L" mode instruction signal M from 2 causes the operation to be similar to that of a VH5 standard VTR, and the synchronization separation circuit 2 supplies a synchronization signal separated from the luminance signal Y.
A chroma signal C with a subcarrier frequency of MHz is low-band converted and a chroma signal (hereinafter referred to as a low-band converted chroma signal) CL with a subcarrier frequency of 629.371 kHz is output. This low frequency converted chroma signal CL is approximately 1.6MH
Unnecessary high-frequency components are removed by LPFII having a cutoff frequency of z, and the signal is supplied to the mixing circuit 9 through the switch 13, where it is mixed with the FM luminance signal Y8 supplied from the HPF 6.

The output signal of the mixing circuit 9 is amplified by a recording amplifier 21 and then supplied to rotating video heads 23 and 24 which are rotated by a cylinder motor 27 and have mutually different azimuth angles.
The information is recorded on a magnetic tape 22 that is run at a constant speed by a capstan motor 28.

Audio signal A output from video camera 1 is supplied to FM modulation circuit 14 . In this FM modulation circuit 14, the carrier frequency and deviation are set by a carrier adjustment circuit 16 and a deviation adjustment circuit 15, which are controlled by an "L" mode instruction signal M from an input terminal 32, and the VH
In order to comply with the 3 standards, the left channel of audio signal A is 1.3MHz ± 150kHz, and the right channel is 1.7M.
The audio signal A is FM-modulated to become an FM signal of Hz±150kHz.

An audio signal (hereinafter referred to as an FM audio signal) formed by mixing the FM-modulated left and right channels (AFII)
The unnecessary components in the high range are removed by LPF17 and the switch 1
9 and is amplified by a recording amplifier 20, then supplied to rotary audio heads 25 and 26 having different azimuth angles and recorded on the magnetic tape 22.

The servo circuit IIM 29 controls the cylinder motor 27 and the capstan motor 28 using the output clock of the oscillation circuit 30 as a reference signal. As a result, like a VH3 standard VTR, the rotating video head 23, 24 and rotating audio head 25
．． 26 rotates, and the rotating video heads 23, 24 and rotating audio heads 25, 26 alternately scan the magnetic tape 22 every 1/2 rotation, and generate video signals for one field at a time.
Record the audio signal. In this case, the rotating video head 23
．． 24, a mixed signal of the FM luminance signal Y
FM is recorded in the deep part of the magnetic tape 22. The magnetic tape 22 also runs at a constant speed similar to that of a VH8 standard VTR.

Further, the servo circuit 29 generates a control signal having a period equal to the length of one frame of the luminance signal Y from the output clock of the oscillation circuit 30. This control signal is supplied to the control head 31 and the rotating video head 23 .
Video track and rotating audio head by 24 25.26
The magnetic tape 22 shows the phase of the audio track by
recorded above.

In this way, a track pattern conforming to the VH3 standard is formed on the magnetic tape 22.

Next, the operation of this embodiment when the video camera l outputs a video signal for slow motion images will be described. Note that such video signal recording is hereinafter referred to as slow motion recording.

In the case of slow motion recording, the mode instruction signal input from the input terminal 32 is "H" (high level), and the switches 8, 13, and 19 are closed to the a side.

Furthermore, the video camera 1 performs a scanning operation at a speed N times the normal speed (where N>l). For this purpose, a video camera 1
The frame period, field period, and horizontal scanning period of the luminance signal Y and chroma signal C output from the NTSC system are 1/N times that of the NTSC system, and the frequency band is N times that of the NTSC system, and the chroma signal The subcarrier frequency of C is also N times that of the NTSC system. Hereinafter, these luminance signal Y and chroma signal C will be referred to as N-times-speed luminance signal and N-times-speed chroma signal, respectively, and those based on the above NTSC system are
They are called a normal luminance signal and a normal chroma signal, respectively. however,
Audio signal A output from video camera l! ,tNTS
This is the same as in the case of the C method.

A brightness signal Y at N times the speed outputted from the video camera 1 is supplied to a synchronization separation circuit 2 and an FM modulation circuit 3. When the mode instruction signal M from the input terminal 32 is "H", the carrier adjustment circuit 5 and the deviation adjustment circuit 4 are switched to operation for slow motion recording, and the FM
The carrier frequency and deviation of the modulation circuit 3 are set to be N times that of the normal luminance signal Y described above. That is, the carrier frequency is 3.4 MH2XN at the leading edge level of the synchronization signal of the N-times brightness signal Y, and the carrier frequency is (4,4±0.1 MHz)×N at the white peak level. The N-times FMi 1 degree signal YFM outputted from the FM modulation circuit 3 is supplied to the mixing circuit 9 through a switch 8 after unnecessary low-frequency components are removed by the HPF 7 which has a cutoff frequency N times that of the HPF 6. be done.

The N-times speed chroma signal C output from the video camera l is supplied to the low frequency conversion circuit 10. This low frequency conversion circuit 10
When the mode instruction signal M from the input terminal 32 is "H", the operation is switched to slow motion recording, and the synchronization signal of the N times faster luminance signal Y separated by the synchronization separation circuit 2 is supplied. , N times faster chroma signal C,
It is converted into a low-frequency converted chroma signal CL having a subcarrier frequency N times that of the normal chroma signal C. Therefore, the subcarrier frequency of this N times faster low frequency converted chroma signal C4 is 629.371 kHz x N. This N
The double-speed low-frequency converted chroma signal CL is sent to the LPF 12, which has a cutoff frequency N times that of LPF II, to remove unnecessary high-frequency components, and is then supplied to the mixing circuit 9 using the switch 13, where it is converted from the HPF 7 at N times the speed. is mixed with the luminance signal Y8.

The output signal of the mixing circuit 9 is amplified by a recording amplifier 21, and then supplied to a rotating video head 23, 24 and recorded on a magnetic tape 22.

The audio signal A output from the video camera 1 is a normal audio signal, and is supplied to the FM modulation circuit 14 and modulated. At this time, the carrier adjustment circuit 16 and the deviation adjustment circuit 15 are switched to operation for slow motion recording by the "H" mode instruction signal M from the input terminal 32, and the carrier frequency and deviation of the FM modulation circuit 14 are changed to the normal level. It is set to N times. The FM audio signal A y ) 1 output from the FM modulation circuit 14 has unnecessary high-frequency components removed by the LPF 18 having a cutoff frequency N times that of the LPF 17 , and passes through the switch 19 to the recording amplifier 2.
After being amplified by 0, the signal is supplied to a rotary audio head 25, 26 and recorded on the magnetic tape 22.

Even in this case, the output signal of the mixing circuit 9 is
The FM audio signal A8 is recorded on the shallow layer of the magnetic tape 2.
It is recorded in the deep part of 2.

The oscillation circuit 30 generates a clock with a frequency N times the normal frequency in response to the "H" mode designation signal M from the input terminal 32. The servo circuit 29 controls the cylinder motor 27 and capstan motor 28 using this clock as a reference signal. As a result, the rotating video head 2324 and the rotating audio heads 25 and 26 rotate at a speed N times that of normal recording, and the magnetic tape 22 also runs at a constant speed N times that of normal recording. Further, the servo circuit 29 generates a control signal having a frequency N times that of normal recording from the clock output from the oscillation circuit 30, and this control signal is recorded on the @stape 22 by the control head 31.

In addition, this control signal is, for example, VH3 standard (7
) V I S S (V) Is INDEX 5RA
RC)l SYSTEM) and VASS (V)Is A
DRESS 5EARCHSYSTEM) (7) Include information to indicate that slow motion recording has been performed.

According to such slow motion recording, the rotational speeds of the rotating video heads 23, 24 and the rotating audio heads 25, 26 and the running speed of the magnetic tape 22 are N times higher than normal recording, so the video tracks and audio on the magnetic tape 22 are The inclination, length, and pitch of the track are the same as during normal recording, and the V
It is the same as magnetic tape recorded on H3 standard VTR. In addition, since a control signal with a frequency N times that of normal recording is recorded on the magnetic tape 22, which runs at a speed N times that of normal recording, the pitch of the recording control signal on the magnetic tape 22 is also the same as that of normal recording. is the same as Therefore, even in slow motion recording, the track pattern on the magnetic tape 22 conforms to the VH3 standard.

Furthermore, the frame period, field period, and horizontal scanning period of the N-times-speed luminance signal Y and chroma signal C are 1/N times those of the NTSC system, and the rotation period of the rotating video head 23, 24 is 1/N times that of the normal recording. /N times, by synchronizing the rotational phase of the rotating video heads 23 and 24 with this luminance signal Y, one field of the FM luminance signal YFM and the low-frequency conversion chroma signal CL are sent to each video track of the magnetic tape 22. recorded. In this case, the carrier frequency and deviation of the FM luminance signal YF, and the subcarrier frequency of the low-frequency converted chroma signal CL are adjusted to the normal recording speed in response to the fact that the rotational speed of the rotating video head 23, 24 is N times that of normal recording. Because it is closed N times during recording, the magnetic tape 2
FM bright variable signal recorded on video track 2￥F
The low frequency converted chroma signal Ct is the same as that recorded normally. This means that the FM audio signal AF
The same applies to H.

As described above, even with slow motion recording, the track pattern on the magnetic tape 22 and the frequency of the recording signal are the same as those of a VH3 standard VTR. Therefore, this magnetic tape 2 is
2 can be played normally.

When a magnetic tape 22 recorded in slow motion is normally played back on a VH3 standard VTR, the magnetic tape 122 has a space between two adjacent video tracks that would be recorded in normal recording. (N-1) video tracks representing information changes between the information contents are formed, and since these video tracks are normally played back in order, the movement of the played image is the same as when normal recording is performed. The time axis is expanded and changed by N times, and a high-resolution l/N times larger low-motion image is obtained.

Furthermore, since the FM audio signal during slow-motion recording is also recorded with its carrier frequency and deviation set to N times that of normal recording, when this is normally played back on a VH5 standard VTR, The frequency and deviation are the same as in normal recording, and playback is possible.

FIG. 2 is a block diagram showing an example of the low-frequency conversion circuit IO in FIG.
is a frequency converter, 39 is an input terminal, 40 is an output terminal, and parts corresponding to those in FIG. 1 are given the same reference numerals.

In the figure, during normal recording, the switch 36 is closed to the b side by the mode instruction signal M of L1.

In this case, the signal F3 having the frequency fs output from the oscillation circuit 34 is supplied to the frequency converter 37 via the switch 36. Further, the horizontal synchronization signal H5 separated from the luminance signal Y by the synchronization II circuit 2 is multiplied by the multiplier circuit 33,
A signal FL with a frequency of ", is generated. This signal FL is supplied to the frequency converter 37, and a signal with a frequency of (fs+fL) is generated and supplied to the frequency converter 38.

On the other hand, the chroma signal C output from the video camera 1 (FIG. 1) is supplied from the input terminal 39 to the frequency converter 38, and is frequency-converted by the output signal of the frequency converter 37. Here, the subcarrier frequency f of the chroma signal C is
As a result, the frequency converter 38 outputs a low frequency converted chroma signal CL having a subcarrier frequency of fL, which is supplied from the output terminal 40 to the LPFII (FIG. 1).

Here, assuming that the chroma signal C is based on the NTSC system and is recorded according to the VH3 standard, f s = 3.58 MHz, fL = 629.371.
It is kHz.

In the case of slow motion recording, the switch 36 is closed to the a side by the mode instruction signal M of "I(").

and is supplied to the frequency converter 37. Also, the horizontal synchronization signal H separated from the N-times speed luminance signal Y by the synchronization separation circuit 2
3 is multiplied by a multiplier circuit 33, and a signal FL having a frequency of NrL is generated. This signal F is also supplied to the frequency converter 37, and a signal with a frequency of (Nf, -I-Nf,) is generated and supplied to the frequency converter 38.

On the other hand, the subcarrier frequency of the N times faster chroma signal C supplied from the input terminal 39 to the frequency converter 38 is N f
s, the frequency is converted by the output signal of the frequency converter 37, and the carrier frequency is NF at the output terminal 40.
A low frequency converted chroma signal CL of L is obtained.

Note that as the reference signal of the servo circuit 29 in FIG. 1, the output signal of the switch 36 in FIG. 2 may be used instead of the output clock of the oscillation circuit 30.

FIG. 3 is a block diagram of main parts showing another embodiment of the magnetic recording/reproducing apparatus according to the present invention, in which 41 is a conversion circuit;
Parts corresponding to those in FIG. 1 are given the same reference numerals.

In the figure, a video camera 1 does not output a chroma signal C like the video camera 1 shown in FIG. 1, but outputs two Heath hand color difference signals RY and BY. The conversion circuit 41 modulates these color difference signals R-Y and B-Y to produce a low-pass converted chroma signal CL similar to the low-pass converted chroma signal CL generated by the low-pass conversion circuit 10 in FIG.
generate.

The other points are the same as the embodiment shown in FIG. 1, so the explanation will be omitted.

FIG. 4 is a block diagram showing a specific example of the conversion circuit 41 in FIG.
1) Circuit, 46.47 is a modulation circuit, 48 is a mixing circuit, 4
9 is an output terminal, and parts corresponding to those in FIG. 3 are given the same reference numerals.

In the figure, f is output from the oscillation circuit 42.

On the one hand, the signal F with a frequency of
The signal FSN has a frequency of t'+, and the a of the switch 44 is
Supplied on the side. Switch 44 is switched and controlled by mode instruction signal M, and is controlled by signal F3. One of the FSNs is selected and supplied to the AFC circuit 45. The AFC circuit 45 is also supplied with the horizontal synchronization signal H3 output from the synchronization separation circuit 2.

For normal recording that complies with VH3 standards, video camera 1
(FIG. 1) outputs an NTSC video signal, the frequency f3 of the output signal F3 of the oscillation circuit 42
is 3.58 MHz, and the frequency of the horizontal synchronizing signal H8 is approximately 15.7 kHz.The switch 44 selects the signal F by the mode instruction signal M at "L", and the AFC circuit 4
5 generates two subcarriers both having frequencies of 629.371 kHz and a phase difference of 90@.

On the other hand, the color difference signal R- from the video camera I (Fig. 1)
Y is supplied to a modulation circuit 46, which performs balanced modulation on one subcarrier from the AFC circuit 45. Further, the color difference signal B-Y from the video camera 1 is supplied to the modulation circuit 47,
The other subcarrier from the FC circuit 45 is balanced modulated. The output signals of these modulation circuits 46 and 47 are sent to the mixing circuit 48.
The subcarrier frequency is 629.371k.
A low frequency converted chroma signal C5 of Hz is generated. This low frequency converted chroma signal C5 is sent from the output terminal 49 to the LP in FIG.
FII is supplied to the mixing circuit 9 via the switch 13.

When recording slow motion, 1H from input terminal 32
'' mode instruction signal M, the switch 44 selects the output signal F, 9 of the NJ multiplication circuit 43. Also, at this time, the frequency of the horizontal synchronization signal H8 from the synchronization separation circuit 2 is N times that of normal recording. Yes, the AFC circuit 45 outputs the frequency (
Two subcarriers with a phase difference of 90'' at 629,371kHz x N) are output, and the modulation circuit 46.4
7. As a result, a low frequency converted chroma signal CL having a subcarrier frequency of (629,371kHzXN) is obtained at the output terminal 49.

Although the present invention has been described in detail above, the present invention is not limited only to these examples.

For example, in the above embodiment, the video camera 1 is NTSC.
Although it is used for a format other than the VH3 standard, it may be used for other formats such as PAL or SECAM, or may be recorded in a format other than the VH3 standard.

Further, although the present invention is intended for slow motion recording, it is not limited to this only, and can be applied to N times speed video signals from any signal source.

For example, if the playback speed of the playback VTR is set to N times the normal speed, a video signal at N times the same speed as in the case of slow motion recording described above can be obtained, but the present invention can also be applied to this. This makes it possible to achieve good high-speed dubbing.

(Effects of the Invention) As explained above, according to the present invention, a large capacity memory is not required and a video signal generated at an arbitrary high speed can be processed by simply adding some signal processing means to the configuration of an existing device. In addition, the recording format of the magnetic tape can be made compatible with existing standards, making it possible to play back on existing equipment, and even on existing equipment that does not have a special playback function. , enabling high-resolution slow-motion playback.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the magnetic recording/reproducing apparatus according to the present invention, FIG. 2 is a block diagram showing a specific example of the low frequency conversion circuit in FIG. 1, and FIG. FIG. 4 is a block diagram showing a specific example of the conversion circuit in FIG. 3. FIG. 1... Video camera, 3... FM modulation circuit, 4...
- Deviation adjustment circuit, 5... Carrier adjustment circuit, 6.7... Bypass filter, 8... Switch,
9...Mixing circuit, 10...Low frequency conversion circuit, 11.1
2...Low pass filter, 13...Switch, 22
...Magnetic tape, 23.24...Rotating video head, 25.26...Rotating audio head, 27...Cylinder motor, 28...Capstan motor, 29...
Servo circuit, 30... Oscillation circuit, 32... Mode command Figure 4

Claims (1)

[Scope of Claims] 1. A magnetic recording and reproducing device that sequentially records and reproduces video signals on a magnetic tape using a rotating head, which has a higher number of fields per second, signal frequency, and frequency than standard video signals. A high-speed video signal with a bandwidth of N (N>1) is input, and the rotation speed of the rotary head and the running speed of the magnetic tape are set to N times the recording speed of the video signal of the standard method. 1. A magnetic recording and reproducing apparatus characterized in that the high-speed video signal can be recorded on the magnetic tape using the same track pattern as in the case of recording the high-speed video signal. 2. In claim 1, the input high-speed video signal consists of a high-speed luminance signal and a high-speed chroma signal, and the high-speed luminance signal is converted to a carrier frequency N times that of the standard luminance signal at the time of input, and a frequency deviation is set. modulate the high-speed macro signal to a low-frequency converted chroma signal with a subcarrier frequency N times that of a standard chroma signal, and mix the frequency-modulated luminance signal and the low-frequency converted chroma signal. A magnetic recording/reproducing apparatus characterized in that the magnetic recording/reproducing apparatus records on the magnetic tape. 3. In claim 1, the input high-speed video signal consists of a high-speed luminance signal and two high-speed color difference signals, and the high-speed luminance signal is converted to a carrier frequency N times that of the standard luminance signal at the time of input. to generate a low frequency converted chroma signal with a subcarrier frequency N times that of a standard chroma signal from the high speed color difference signal, and combine the frequency modulated luminance signal and the low frequency converted chroma signal. A magnetic recording/reproducing apparatus characterized in that the mixed information is recorded on the magnetic tape. 4. In claim 1, 2 or 3, an audio signal is input together with the input of the high-speed video signal, and the audio signal is frequency modulated with a carrier frequency N times the deviation of the audio signal input together with the standard video signal. A magnetic recording and reproducing apparatus, characterized in that the frequency-modulated audio signal is recorded on the magnetic tape. 5. The magnetic recording and reproducing apparatus according to claim 1, 2, 3, or 4, wherein an information signal indicating that the high-speed video signal is recorded is recorded on the magnetic tape.