JPH02123884A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To eliminate the need for the preparation of separate reproducing devices by providing the 1st mode recording/reproducing an existing broadcast system NTSC video signal and the 2nd mode recording/reproducing a band compression high definition video signal and using an input video signal identification signal so as to select the mode and to record a prescribed video signal. CONSTITUTION:The servo control 80 is set to a prescribed recording mode in response to an identification signal VR of an input video signal to record both the video signals. On the other hand, at reproduction, the reproducing mode is identified depending on the difference in the frequency of a control signal or the difference in the form of the recorded video signal to output an identification signal Vp. Then the servo control 80 is set to the prescribed reproduction mode in response to the identification signal Vp of the reproduction mode, the signal processing circuit 200 is switched and the reproducing signal is processed according to a prescribed format to decode the original video signal. Thus, both the high definition video signal subject to band compression and the NTSC video signal are recorded/reproduced by the same device.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an apparatus for recording and reproducing video signals etc. on a recording medium, and particularly relates to a device for recording and reproducing video signals etc. on a recording medium, and particularly for recording and reproducing video signals etc. on a recording medium, and particularly for recording and reproducing video signals etc. in a band-compressed high-definition video signal and a current broadcasting system (NTSC) video signal. The present invention relates to a magnetic recording and reproducing device capable of recording and reproducing both.

[Conventional technology]

Conventionally, V
Examples of TR include National Technical Report, Volume 32. Number 4 (August 1986) pages 2 to 10 (National Techni
cal Report vol.32 No.4
(Aug, 1986) pp 2-10).

However, no consideration is given to a system for recording and reproducing both band-compressed high-definition video signals and current broadcasting system (NTSC) video signals.

By the way, improvements in broadcasting systems are currently increasing the resolution of picture quality, and HDTV (HDTV) has about twice as many scanning lines as the current broadcasting system (NTSC) and has dramatically improved picture quality.
(igh Definition TV) Broadcasting is about to start.

In the HDTV system, the video signal band is extremely wide as shown in FIG. For this reason, for broadcasting, a band compression method has been proposed, as shown in FIG. 3, which compresses the band of a wide band high-definition video signal and transmits it efficiently.

Therefore, it is expected that the future broadcasting format will be one in which HDTV broadcasting using band compression technology will coexist in addition to the current broadcasting (NTSC).

[Problem to be solved by the invention]

Although the above conventional technology supports band-compressed high-definition video signals, the current broadcasting system (NTSC)
No consideration was given to video signals.

For this reason, users are required to prepare separate magnetic recording and reproducing devices to record and reproduce video signals of each system, which poses a problem of great inconvenience in terms of usability and economy.

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic recording and reproducing apparatus that can record and reproduce both band-compressed high-definition video signals and current broadcast system (NTSC) video signals with good consistency.

(Means for solving problems) The above objective is achieved as follows.

That is, a means for outputting an identification signal for distinguishing input video signals, a means for appropriately switching a signal processing circuit according to the above-mentioned identification signal and processing the signal according to a recording format determined for each, and a means for outputting an identification signal for distinguishing between input video signals; means for setting the servo control to a predetermined recording mode, a reproduction mode identification means for identifying the video signal system recorded on the recording medium, and a reproduction mode identification means for setting the servo control to a predetermined reproduction mode in accordance with the identification signal from the reproduction mode identification means. The original video signal is restored by having a means for setting the mode and a means for switching the signal processing circuit according to the identification signal from the reproduction mode identification means and processing the signal according to a predetermined format determined respectively. do.

[Effect]

As input video signals, either band-compressed high-definition video signals or current broadcasting system (NTSC) video signals having different signal bands are input.

By switching the signal processing circuit according to the identification signal that distinguishes the input video signal, the band-compressed high-definition video signal and the current broadcasting system (NT
SC) The signal is processed so that the signal band when recording on the magnetic tape is almost the same as that of the video signal.

Further, by setting the servo control to a predetermined recording mode according to the identification signal of the input video signal, both of the video signals can be recorded.

On the other hand, during playback, the playback mode is identified based on the difference in the frequency of the control signal or the difference in the format of the recorded video signal, and an identification signal is output.

Then, the servo control is set to a predetermined playback mode in accordance with the playback mode identification signal, and the signal processing circuit is switched to process the playback signal according to a predetermined format.
Restore the original video signal.

By doing the above, it is possible to record and reproduce both a band-compressed high-definition video signal and a current broadcasting system (NTSC) video signal using the same device.

〔Example〕

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

Figure 1 shows the current broadcasting system (NT
SC) Magnetic recording and reproducing device showing an embodiment of the present invention capable of recording and reproducing both a video signal (hereinafter referred to as an NTSC signal) and a band-compressed high-definition video signal (hereinafter referred to as a band-compressed signal) (hereinafter referred to as a DTV signal). FIG. 2 is a block diagram of the device.

First, as an example, the currently widely used home VTR
A case will be described in which an NTSC signal is recorded and reproduced using the same method (for example, V) (S method).

In FIG. 1, the NTSC signal input from the NTSC signal input terminal 1 during recording is filtered through a low-pass filter (hereinafter referred to as
(hereinafter referred to as LPF) 10 and a band pass filter (hereinafter referred to as BP
(denoted as F) 20.

In LPFIO, the luminance signal is extracted from the NTSC signal,
The signal is supplied to the FM modulation circuit 60 via the changeover switch 50. The luminance signal is FM modulated by the FM modulation circuit 60 and then supplied to one input terminal of the addition circuit 40.

The BPF 20 extracts a carrier color signal from the NTSC signal and supplies it to the frequency conversion circuit 30.

The carrier color signal in the vicinity of 3.58 MH2 supplied to the frequency conversion circuit 30 is converted to a predetermined low frequency, for example 629 KHz (hereinafter, this signal will be referred to as a low frequency converted color signal), and then the other side of the adder circuit 40 is supplied to the input terminal of

The adder circuit 40 adds the luminance signal obtained as described above and the low frequency converted color signal, and the added signal is sent to the changeover switch 51. Recording amplifier 70. Through the changeover switch 52, the magnetic head 90.90''
recorded in

The magnetic heads 90 and 90' are attached to the cylinder 101 facing each other 180 times, and the magnetic tape 100 is wound around the cylinder 101 more than 1800 times.

By the way, the changeover switches 50 to 52 are controlled in the following manner. That is, the recording mode changeover switch 3 selects either the NTSC signal or the band compression HDTV signal, and the identification signal generation circuit 4 outputs the identification signal vR in response to the selection.

The changeover switches 50 to 52 are operated by this identification signal □.
When recording an NTSC signal, it is connected to the terminal N side, and when recording a band compression HDTV signal, it is connected to the terminal H side.
Switching is performed so that predetermined signal processing is applied to each of the NTSC signal and the band-compressed HDTV signal.

The identification signal vR is also supplied to the servo control circuit 80 to perform capstan motor control, cylinder motor control, and control signal recording/reproducing head (hereinafter referred to as CTL head) for servo control during reproduction. ) 83, a control signal (hereinafter referred to as a CTL signal) to be recorded on the magnetic tape 100 is output from the servo control circuit 80.

If you do the above, you can use home VT, which is currently widely used.
An NTSC signal can be recorded on the magnetic tape 100 using the same method as R (for example, VH3 method), but the case of reproducing this signal will be explained next.

The video signal recorded on the magnetic tape 100 is reproduced by a magnetic head 90.90 degrees, and is supplied to a preamplifier 210 via a changeover switch 200.

The output signal from the preamplifier 210 is BPF220 and L
The signal is supplied to the PF 230, where the BPF 220 extracts an FM-modulated luminance signal, and the LPF 230 extracts a low-frequency converted color signal.

Among these, the luminance signal is transmitted to F via the changeover switch 201.
The signal is supplied to the M demodulation circuit 260, demodulated to the original baseband signal, and then input to one input terminal of the addition circuit 250 via the changeover switch 202.

On the other hand, the low frequency converted color signal is supplied to the frequency conversion circuit 240 and frequency converted to the original carrier color signal near 3.58 MH2, and then input to the other input terminal of the addition circuit 250.

The adder circuit 250 combines the luminance signal obtained as described above and the carrier color signal, and outputs a separate NTSC signal from the terminal 5.

By the way, the changeover switches 200 to 202 are controlled as follows. That is, in the case of an NTSC signal, the changeover switches 200 to 20 are selected according to the identification signal V output from the reproduction mode identification circuit 82 based on the reproduction CTL signal reproduced by the CTL head 83 during reproduction.
2 is connected to the terminal N side, and in the case of a band-compressed HDTV signal, it is connected to the terminal H side, and is switched so that predetermined signal processing is applied to each of the NTSC signal and the band-compressed HDTV signal.

Also, during playback, the servo control operation is set to either the mode for playing back the NTSC signal or the mode for playing back the band-compressed HDTV signal, and the playback mode identification circuit 82 is operated by the CTL signal played back from the CTL head 83. Then, the frequency of the reproduced CTL signal is identified to obtain an identification signal V, and the servo control circuit 80 controls the rotational speed of the capstan motor and cylinder motor to a predetermined value according to this identification signal V. By doing so, it is possible to obtain a reproduced video signal in good quality and automatically.

If you do the above, you can use home VT, which is currently widely used.
NTSC signals can be recorded and reproduced using the same system as R (for example, VH3 system).

More specifically, the high-definition home VTR system (for example, 5-VH3 system), which is currently becoming widespread, is 62
The rotation of the mmφ cylinder is controlled to be 180 rpm, and the carrier center frequency of the FM signal is set to 6.2 MH.
If the maximum frequency deviation is set to 1.6 MHz, an NTSC signal with a band of approximately 4 MHz can be recorded and reproduced without substantially deteriorating the image quality.

Next, the case of recording and reproducing a band-compressed HDTV signal will be described.

The magnetic recording and reproducing apparatus of the present invention shown in FIG. 1 will be described below using, as an example, a band-compressed HDTV signal having a signal band approximately twice (8.1M7) that of the above-mentioned NTSC signal.

In FIG. 1, the band-compressed HDTV signal input from the band-compressed HDTV signal input terminal 2 during recording is supplied to a recording signal processing circuit 200.

The recording signal processing circuit 200 has a signal that is approximately twice that of the NTSC signal (8
, 1MH2).
Divide the signal into two channels and make the recording signal band per channel almost the same as the NTSC signal band,
A concrete example of the signal processing is shown in FIG. 4, and a waveform showing the process of generating the recording signal is shown in FIG. 5.

The operation of the recording signal processing circuit 200 will be described below with reference to FIGS. 4 and 5.

In FIG. 4, a band-compressed HDTV signal (FIG. 5(a)) input from an input terminal 201 is converted from an analog signal to a digital signal by an A/D converter 202 using a sampling clock WCK generated by a clock generation circuit 203. After being successively converted into a signal, it is supplied to a time axis expansion two-channel division circuit 204.

This time axis expansion 2 channel division circuit 204 is mainly composed of memory, and the digital signal from the A/D converter 202 is written into the memory of the time axis expansion 2 channel division circuit 204 based on the sampling clock WCK. It will be done. The time axis expansion two-channel dividing circuit 204 sequentially distributes the band compressed HDTV signal (FIG. 5(a)) to two channels at a rate of one horizontal scanning line and expands the time axis.

In this time axis expansion, the frequency fR is fw = n x f with respect to the frequency f8 of the sampling clock WCK.
The clock generation circuit 203 generates a read clock RCK having the relationship R(n>1)--------=--(1), and the read clock RCK is written to the memory using this read clock RCK. This is achieved by reading the digital signal.

At this time, the signal S1'' of each channel is output from the time axis expansion two-channel dividing circuit 204.

The time axis of 32° is expanded by n times in units of n horizontal scanning lines, and the signal S, ゛ of each channel is expanded by n times.

321 are supplied to selection circuits 206 and 207, respectively.

On the other hand, in the synchronization generation circuit 205, the read clock R
Based on CK, new horizontal synchronization information SY is generated and supplied to the selection circuits 206 and 207.

The selection circuit 206 time-division multiplexes the signal 3.1 and the horizontal synchronization information SY by appropriately selecting them to obtain the recording signal shown in FIG. 5(b), which is converted into an analog signal by the D/A converter 208. The converted signal is output from the output terminal 210 as SI. Similarly, the selection circuit 207
Then, the recording signal shown in FIG.

In the specific example shown in FIG. 5, the expansion rate n in equation (1) and the period T of the horizontal synchronization information SY are defined as
If one horizontal scanning period of the V signal is IH, then 2H=Ts+nX)('=------
−−−−−−−− (2) There is a relationship. - As an example, n=1.8. When Ts = 0.2H, each of the recording signals S, , S is obtained by expanding the time axis of the band-compressed HDTV signal by 1.8 times in horizontal scanning units.

Therefore, the signal band B of the recording signals S, , S, is B=
8.1 MHz/n=8.1 MHz/1.8 =4
．． 5 MHz-...-(3), which can be made almost the same as the band of the NTSC signal.

The horizontal synchronization information SY output from the synchronization generation circuit 205 may be of various kinds, one example of which is shown in FIG.

Figure 6(a) shows negative synchronization information, Figure 6(b) shows positive synchronization information added to negative synchronization information to improve the S/N of the synchronization information, and Figure 6(C) shows the S/N information of the synchronization information. In order to further improve N, a burst signal is added to the negative synchronization information.

In particular, the synchronization information shown in FIG. 3C is optimal for correcting time base errors such as jitter and skew during playback by minimizing the influence of noise.

As is clear from the above explanation, by the recording signal processing circuit 200 of FIG. The recording signal band is almost the same as that of the signal.

Therefore, the recording signals S+ and S2 outputted from the recording signal processing circuit 200 can be FM modulated with the same FM allocation as when recording the NTSC signal, and can be recorded using the same mechanical system and approximately the same recording wavelength. .

Therefore, in FIG. 1, the recording signal SI outputted from the recording signal processing circuit 200 is transmitted to the changeover switch 50.
FM modulation circuit 60. Changeover switch 51° Recording amplifier 7
0. Through the changeover switch 52, the magnetic head 91.9
1' can be recorded on the magnetic tape 100.

FM modulation circuit 60. The recording amplifier 70 may be exactly the same as that used for recording the NTSC signal, and can be shared by switching operations of the changeover switches 50 and 51, so that the circuit scale can be reduced.

The changeover switches 50, 51.52 are connected to the terminal H side when recording band compression HDTV signals due to the identification signal (1) as described above, and the changeover switches 50, 51.52 are connected to the terminal H side, It is switched so that signal processing is performed.

On the other hand, the recording signal of the other channel output from the recording signal processing circuit 200 is transmitted to the newly provided FM modulation circuit 61. Through the recording amplifier 71, the magnetic head 92.92
' is recorded on the magnetic tape 100.

The above FM modulation circuit 61. The recording amplifier 71 is connected to the FM modulation circuit 60 . It may be exactly the same as the recording amplifier 70.

The magnetic heads are arranged in two sets (9 pairs) facing each other at 180 @.
1 and 91°, 92 and 92゛) are band compression HD
It is attached to the cylinder 101 for recording and reproducing TV signals.

In this embodiment, the servo control when recording the band compression HDTV signal is performed by controlling the recording signals St, S of each channel.
Since the band of t is reduced to the same level as the band of the NTSC signal, the rotation speed of the cylinder is the same as when recording the NTSC signal (for example, 1800 rpm).
It should be controlled to.

Furthermore, if the tape running speed is controlled by the servo control circuit 80 to be twice that of the NTSC signal in accordance with the identification signal vR, it is possible to record and reproduce band-compressed HDTV signals with almost the same S/N as the NTSC signal. occurs.

Next, the case of reproducing the above-mentioned band-compressed HDTV signal will be explained.

The recording signal S1 recorded on the magnetic tape 100 is reproduced by the magnetic head 91, 91' and supplied to the preamplifier 210 via the changeover switch 200.

The output signal from the preamplifier 210 is transferred to the selector switch 20.
1 to the FM demodulation circuit 260, and the FM demodulated playback signal is input to one input terminal of the playback processing circuit 300 via the changeover switch 202.

As described above, the changeover switches 200 to 202 are connected to the identification signal vP output from the playback mode identification circuit 82.
Accordingly, in the case of a band-compressed HDTV signal, it is connected to the terminal H side and switched so that the above-mentioned predetermined signal processing is performed.

The preamplifier 210. FM demodulation circuit 260 is NTSC
It is the same as the one used for signal reproduction, and can be shared by the switching operations of the changeover switches 200 to 202, so the circuit size can be reduced.

On the other hand, magnetic tape 100. The recording signal S2 of the other channel recorded on the magnetic head 92.92 is reproduced by the newly installed preamplifier 211. FM
The reproduced signal is sent to the reproduced signal processing circuit 3 via the I-key circuit 261.
It is input to the other input terminal of 00.

The reproduced signal processing circuit 300 compresses the time axis of the reproduced signal, performs channel synthesis, and restores the original band-compressed HDTV signal. A specific example thereof is shown in FIG.

In FIG. 7, a reproduced signal SI input from an input terminal 301 is transmitted to a synchronization separation circuit 303. The signal is supplied to an A/D converter 305. A synchronization separation circuit 303 separates horizontal synchronization information SY added during recording. Clock generation circuit 30
In step 7, a clock WCK° that is phase-synchronized with this separated horizontal synchronization information SY is generated.

On the other hand, the reproduced signal S supplied to the A/D converter 305
1 is sequentially converted from an analog signal to a digital signal based on the clock WCK'.

Since the clock WCK' is generated from the reproduced signal S1, the A/D converter 305 can perform sampling in complete phase synchronization with time axis errors such as jitter in the reproduced signal Sl.

The reproduced signal Sl converted into a digital signal undergoes time base error correction in a time base collector (hereinafter referred to as TBC) 309. That is, the TBC 309 is composed of a memory, and writing to this memory is performed using the reproduction signal S1.
By using the above clock WCK' that follows the time axis error of The time axis error of the signal Sl can be corrected.

However, the frequency f.''+fRI of the clock WCK'' and the clock RCKI are both the same as the frequency f1 of the read clock RCK shown in FIG.

The reproduced signal S1 outputted from the TBC 309 whose time axis error has been corrected is transmitted to the time axis compressed channel synthesis circuit 3.
12.

The reproduced signal S2 of the other channel input from the input terminal 302 is sent to the synchronization separation circuit 304 and the A/D converter 3.
06. By the clock generation circuit 308° TBC310,
The signal is processed in exactly the same way as the above-mentioned reproduced signal S1, the time axis error is corrected, and the time axis compressed channel synthesis circuit 312
is supplied to

The time axis compression channel synthesis circuit 312 performs signal processing opposite to that of the time axis expansion channel division circuit 204 in FIG. 4 in order to convert to the original band compression HDTV signal.

That is, horizontal synchronization information SY added during recording is removed, time axis compression is performed, and channels are combined.

The time axis compression channel synthesis circuit 312 is mainly composed of memory, and the time axis compression is performed using the TBCs 309 and 31 described above.
Reproduction signal S with time axis error corrected output from 0
l, S! The above reference clock RCKI with frequency fR1
The frequency f, 1. is for the frequency f□ of the reference clock RCKI, f ax = n X f * I
This can be achieved by reading with the reference clock RCK2 having the relationship =---(4), and the time axis is compressed to 18.

Note that the reference clock RCK2 is generated by the reference clock generation circuit 311, and its frequency r+tz is stable or locked.

Therefore, as described above, if a band-compressed HDTV signal is recorded by setting n=1.8 and expanding the time axis by 1.8 times and dividing it into two channels, then during playback, the time axis is compressed. '/1 in channel synthesis circuit 312
．． By compressing the time axis by a factor of 11 and combining the channels, the original band-compressed HDTV signal can be restored.

The restored band compression HDTV signal output from the time axis compression channel synthesis circuit 312 is sent to the D/A converter 3.
13, the digital signal is successively converted into an analog signal, and the band compressed signal H shown in FIG.
The signal is supplied to the DTV signal output terminal 6.

In addition, the synchronization generation circuit 310 in FIG. 1 generates a vertical synchronization signal VD and a horizontal synchronization signal (ID) in connection with the above-mentioned reproduction signal processing performed in the reproduction signal processing circuit 300, and outputs the respective output terminals 7. Output from 8.

Further, during reproduction, the servo control circuit 80 sets the cylinder rotation speed to the same rotation speed (for example, 1800 rpm) as when recording and reproducing an NTSC signal, in accordance with the identification signal vP output from the reproduction mode identification circuit 82. If the tape running speed is servo controlled to be twice that when recording and reproducing an NTSC signal, it is possible to automatically obtain a band-compressed HDTV signal with almost the same S/N as when recording and reproducing an NTSC signal. can.

Therefore, as described above, if the signal processing circuit and magnetic head are switched according to the input video signal to perform predetermined signal processing, the signal bands can be made to be compatible with each other without changing the rotational speed of the cylinder. NTSC signal and band compression H
With the same FM allocation and mechanism as the DTV signal,
Moreover, recording and reproduction can be performed with approximately the same S/N.

Furthermore, since the recording and playback method for NTSC signals is the same as that of currently popular home VTRs, it maintains complete compatibility with current home VTRs while providing bandwidth compression HD.
TV signals can also be recorded and played back.

Next, a specific example of the reproduction mode identification circuit 82 in FIG. 1 is shown in FIG. 8, and will be explained using the waveform diagram in FIG. 9.

In FIG. 8, CTL input from the input terminal 400
The signal drives a monostable multi-bi break 402 via a preamplifier 401.

When a CTL signal is recorded, a signal with a frame period is recorded on the magnetic tape 100. For example, when the CTL signal is reproduced in a mode in which an NTSC signal was recorded, the CTL signal shown in FIG. 9(a) is reproduced. On the other hand, when a band-compressed HDTV signal is recorded, it is recorded at twice the tape speed, so a CTL signal with a double period is reproduced as shown in FIG. 9(C).

Therefore, when the monostable multipipe lake 402 is driven by the reproduced CTL signal and an NTSC signal is recorded, the signal shown in FIG.
When a TV signal is received, the signal shown in FIG. 9(d) is generated, integrated by an integrating circuit 403, and determined by a determining circuit 404 having a predetermined darkness value for the input signal, thereby generating an identification signal (2). , is output from the output terminal 405.

In addition, in Figure 1, the recording signal was identified by external switching, but this is due to the difference in the format of the NTSC signal and band-compressed HDTV signal, specifically the difference in synchronization format or the difference in one horizontal scanning period. It is also possible to use a method of automatically identifying the information based on, for example.

By doing the above, the NTSC signal can be recorded and played back while maintaining compatibility with currently popular home VTRs, and the NTSC signal
A band-compressed HDTV signal having a wider band than the C signal can also be recorded and reproduced with good consistency, and an easy-to-use magnetic recording and reproducing apparatus can be realized by automatically determining the reproduced signal during reproduction.

[Effects of the Invention] As explained above, according to the present invention, it is possible to record and reproduce NTSC signals while maintaining compatibility with currently popular home VTRs, and also magnetically record and reproduce band-compressed HDTV signals. Since the device can perform recording and reproducing, it is possible to realize a magnetic recording and reproducing device that is more convenient for the user and more economical, and it is possible to provide a magnetic recording and reproducing device with excellent functions, except for the problems of the above-mentioned conventional technology. .

[Brief Description of the Drawings] Figure 1 is a block diagram showing an embodiment of the present invention, Figure 2 is a diagram explaining a high-definition television system, and Figure 3 is a conventionally proposed band-compressed high-definition video signal. FIG. 4 is a block diagram showing an example of an integral part of the recording signal processing circuit 200 in FIG. 1, FIG. 5 is a waveform diagram explaining the operation of the embodiment shown in FIG. 4, and FIG. Synchronization generation circuit 205 in the figure
A waveform diagram showing an example of synchronization information generated by
FIG. 8 is a block diagram showing a specific example of the playback signal processing circuit 300 in FIG. 1, FIG. 9 is a block diagram showing an example of the playback mode identification circuit 82 in FIG. It is a diagram. 1.2...-11~-input terminal, 5-8--output terminal, 3--recording mode changeover switch, 4--...
Identification signal generation circuit, 50-52, 200-202...
・〜・Selector switch, 80−・−・Servo control circuit,
200--recording signal processing circuit, 83--...
CTL head, 82---- reproduction mode identification circuit, 300--- reproduction signal processing circuit. Chart Chart Chart Procedural Amendment (Voluntary) Case Indication Patent Application No. 63-27601 Name of Invention Person who amends magnetic recording/reproducing device Relationship to the case Applicant (510) Hitachi, Ltd.

Claims (1)

[Claims] 1. In a magnetic recording and reproducing device that records and reproduces an NTSC signal and a compressed band high-definition video signal that have different bands from each other,
It has a first mode for recording and reproducing NTSC signals, and a second mode for recording and reproducing band-compressed high-definition video signals,
means for outputting an input video signal identification signal according to the input video signal system; means for processing the video signal supplied according to the input video signal identification signal in accordance with a predetermined format; and the input video signal identification signal. It is characterized by comprising means for setting the servo control to a predetermined recording mode according to the signal, and recording the predetermined video signal by selecting the first mode and the second mode according to the input video signal identification signal. A magnetic recording and reproducing device. 2. In a magnetic recording and reproducing device that records and reproduces an NTSC signal and a compressed band high-definition video signal that have different bands,
a reproduction mode identification means for identifying a format of a video signal recorded on a recording medium; a means for setting servo control to a predetermined reproduction mode in accordance with a reproduction mode identification signal output from the reproduction mode identification means; means for processing the reproduced video signal in accordance with a predetermined format in accordance with the mode identification signal to restore the original regular video signal; A magnetic recording/reproducing device characterized in that it selects and reproduces a predetermined video signal. 3. In a magnetic recording and reproducing device that records and reproduces an NTSC signal and a compressed band high-definition video signal that have different bands from each other,
It has a first mode for recording and reproducing NTSC signals, and a second mode for recording and reproducing band-compressed high-definition video signals,
means for outputting an input video signal identification signal according to the input video signal system; means for processing the video signal supplied according to the input video signal identification signal in accordance with a predetermined format; and the input video signal identification signal. A means for setting the servo control to a predetermined recording mode according to the signal is provided, and the first mode and the second mode are selected according to the input video signal identification signal to record the predetermined video signal on the recording medium. , reproduction mode identification means for identifying the format of the video signal recorded on the recording medium, and means for setting servo control to a predetermined reproduction mode in accordance with a reproduction mode identification signal output from the reproduction mode identification means; comprising means for signal processing the reproduced video signal according to a predetermined format in accordance with the reproduction mode identification signal to restore the original regular video signal;
The playback mode identification signal selects the first mode and the second mode.
1. A magnetic recording/reproducing device characterized in that a predetermined video signal is reproduced by selecting a mode. 4. A magnetic recording and reproducing apparatus according to claim 1 or 3, further comprising means for automatically identifying a video signal system from an input video signal and outputting the input video signal identification signal.