JPH0490281A - Magnetic recording device - Google Patents

Abstract

PURPOSE:To discriminate both aspect ratio automatically by differentiating a phase of a pilot signal of a recording video signal formed based on a 1st aspect ratio from that based on a 2nd aspect ratio. CONSTITUTION:An aspect ratio indication signal CS is fed to a pilot signal generating section 41 in a pilot signal supply section 37. An oscillation circuit 39 supplies an oscillating output signal SO of a prescribed frequency to the pilot signal generating section 41. Each of pilot signals P1-P4 generated in the pilot signal generating section 41 is subject to phase reset processing at a vertical synchronizing period in a recording video signal. Then each phase of the signals PI-P4 is dominated by the aspect ratio indication signal CS applied to the pilot signal generating section 41. The signals P1-P4 are subject to frequency multiplex synthesis in a signal synthesis section 23, from which, e.g. an aspect ratio 4:3 use synthesis recording signal SM is generated.

Description

[Detailed description of the invention] The present invention will be explained in the following order.

Industrial application field Outline of the invention Conventional technology Problems to be solved by the invention Means and action for solving the problems G Example G-1 Structure and operation of the example (Figures 1 to 5) C, - 2 Variations (Fig. 6) C, -3 Reproduction System (Fig. 7) H Effects of the Invention A Industrial Field of Application The present invention is applicable to, for example, a video signal including a luminance signal and a color signal and tracking during reproduction. The present invention relates to a magnetic recording device that uses a rotating magnetic head to record a composite recording signal obtained by frequency multiplexing and combining a pilot signal used for control etc. onto a magnetic tape.

B. Summary of the Invention The present invention uses a rotating magnetic head to generate a composite recording signal that includes a recording video signal formed based on an input video signal and a pilot signal that are frequency-multiplexed. In a magnetic recording device that records on a magnetic tape, it is assumed that phase reset processing is performed on the pilot signal with the vertical period of the video signal for recording. When the video signal is formed based on a video signal capable of obtaining a reproduced image screen having a first aspect ratio, and when the video signal for recording is capable of obtaining a reproduced image screen having a second aspect ratio. When the magnetic tape on which the composite recording signal is recorded is used to reproduce the video signal, the phase of the pilot signal reproduced from the magnetic tape can be changed. Based on this, whether the video signal for recording recorded on the magnetic tape is formed based on a video signal capable of obtaining a playback image screen of the first aspect ratio or a playback screen of the second aspect ratio. It is possible to automatically determine whether the image is formed based on a video signal from which an image screen can be obtained.

C. PRIOR TECHNOLOGY When a color television signal is recorded on a magnetic tape, in the conventional normal recording method, a luminance signal (hereinafter referred to as , FM luminance signal) and a carrier color signal frequency-converted to the lower frequency side (hereinafter referred to as the low-frequency converted color signal) are formed, and the FM luminance signal and the low-frequency converted color signal are frequency-multiplexed and synthesized. A video signal is recorded on the magnetic tape by a rotating magnetic head in the form of sequentially formed inclined recording tracks, and an audio signal is recorded on the magnetic tape by a fixed magnetic head along the running direction of the magnetic tape. Recording is performed with tracks formed. Also,
In addition to this recording method, efforts have been made to record color video signals on magnetic tape at a high density, and to improve the quality of recorded and reproduced audio signals even when the running speed of magnetic tape is extremely slow. In order to maintain the same frequency, the audio signal C, which is a frequency modulated signal (hereinafter referred to as FM audio signal), is frequency-multiplexed and synthesized with the video signal and supplied to a rotating magnetic head. A recording method has also been proposed in which the video signal is recorded on the track together with the video signal.

Furthermore, each of the diagonal tracks around 1 on the magnetic tape is recorded with, for example, one vertical period of a video signal, that is, an I field, and an audio signal corresponding thereto. In addition to the video and audio signals, pilot signals are also used for tracking control, which is performed to make the magnetic head that extracts the video and audio signals from the magnetic tape properly track each of the inclined recording tracks on the magnetic tape. It is proposed that the information be recorded. The pilot signal in such a case is, for example, composed of four types of signals having mutually different frequencies, and these signals are recorded sequentially on each set of four adjacent inclined recording tracks, as shown in FIG. As shown in FIG. 2, four mutually adjacent inclined recording trunks TI, T2 . At T3 and T4, a pilot signal PI whose frequency is Fl, a pilot signal P2 whose frequency is F2, respectively. A pilot signal F3 having a frequency of F3 and a pilot signal P4 having a frequency of F4 are recorded. Frequencies F1 to F4 are, for example, F1<F
2<F4<F3. Note that an arrow M in FIG. 8 indicates the moving direction of the magnetic tape TP.

In this way, the FM audio signal and the pilot signal are frequency-multiplexed and synthesized on the video signal for recording consisting of the FM luminance signal and the low-frequency conversion color signal, and the resulting composite recording signal is formed in a sequential order on the magnetic tape. When recording with a rack (tilt recording), the original luminance signal on the basis of which the FM luminance signal is formed, and the original color signal on the basis of which the low-frequency conversion color signal is formed. Conventionally, it has generally been assumed that the reproduced image screen properly obtained from the original video signal including the original video signal has an aspect ratio of 4:3. However, with the increasing use of repeat images from television signals, the reproduction image screen has been changed from having an aspect ratio of 4=3 as shown by the solid line in FIG. ), as shown by the dashed line in FIG.
:9, and therefore,
The FM luminance signal and the low-frequency conversion color signal that constitute the recording video signal recorded on the magnetic tape as described above are properly adjusted so that the resulting reproduced image screen has an aspect ratio of 1.
In many cases, a video signal with an aspect ratio of 6:9 (hereinafter referred to as a video signal for an aspect ratio of 16:9) is formed based on a luminance signal and a carrier color signal. .

A video signal for an aspect ratio of 16:9 is compared to a video signal in which the properly obtained reproduced image screen has an aspect ratio of 4:3 (hereinafter referred to as a video signal for an aspect ratio of 4:3). Corresponding to the fact that the reproduced image screen is expanded in the horizontal direction, the amount of built-in information is increased and the high frequency components are expanded.
The FM luminance signal and the low frequency conversion color signal that constitute the recording video signal formed based on this are respectively the FM luminance signal and the low frequency conversion color signal that constitute the recording video signal that is formed based on the 4:3 aspect ratio video signal. Compared to the luminance signal and the low frequency converted color signal, for example, the frequency band occupied is shifted to the high frequency side and expanded.

D Problems to be Solved by the Invention As described above, FM audio is added to a video signal for recording consisting of an FM luminance signal and a low frequency conversion color signal formed based on a video signal for an aspect ratio of 4:3. A composite recording signal obtained by frequency multiplexing the signal and the pilot signal is formed based on the state in which the signal and the pilot signal are frequency-multiplexed and recorded with inclined recording tracks formed in a sequential order on the magnetic tape, and the video signal for an aspect ratio of 16:9. , Inclined recording in which a composite recording signal obtained by frequency-multiplexing an FM audio signal and a pilot signal on a video signal for recording consisting of an FM luminance signal and a low-frequency conversion color signal is formed in a sequential array on a magnetic tape. Conventionally, when recording is performed with a track, the recording video signal included in the composite recording signal has an aspect ratio of 4:3 on the magnetic tape on which the composite recording signal has been recorded. No particular information is recorded indicating which one of the 16:9 aspect ratio video signal and the 16:9 aspect ratio video signal was formed.

Therefore, when a magnetic tape on which a composite recording signal has been recorded is used to reproduce a video signal, for example, in reality, the video signal for recording formed based on the video signal for an aspect ratio of 16:9 is Despite being recorded
The read output signal from the magnetic tape has an aspect ratio of 4:3.
The recording video signal formed based on the 4:3 aspect ratio video signal is subjected to the same playback processing as when it is recorded, and the recording video signal formed based on the 4:3 aspect ratio video signal is The image is displayed in the same way as when it was recorded, and as a result, there is a tremor that makes it impossible to obtain an appropriate reproduced image screen.

In view of the above, the present invention provides a composite recording signal in which a recording video signal formed based on an input video signal and a pilot signal are frequency-multiplexed and included in the magnetic head. When recording on a magnetic tape using a composite recording signal, when the magnetic tape on which the composite recording signal is recorded is used to reproduce a video signal, the video signal for recording recorded on the magnetic tape is, for example, 4:3. Is it formed based on a video signal that can properly obtain a reproduced image screen with a first aspect ratio of 16:9, or a reproduced image screen with a second aspect ratio of 16:9, for example? It is an object of the present invention to provide a magnetic recording device that can automatically determine whether a video signal has been formed based on a video signal that can appropriately obtain a video signal.

E. Means for Solving the Problems In order to achieve the above-mentioned object, the magnetic recording device according to the present invention uses a first recording video signal based on a video signal capable of obtaining a reproduced image screen having a first aspect ratio. , and second
a recording video signal forming section that selectively forms a second recording video signal based on the video signal capable of obtaining a reproduced image screen with an aspect ratio of , and a vertical period in the first or second recording video signal; a pilot signal forming unit that obtains a pilot signal for which phase reset processing is to be performed; a pilot signal phase control means; and a pilot signal forming unit that obtains a pilot signal that is to be subjected to phase reset processing; a signal synthesizing means for frequency-multiplexing and synthesizing pilot signals to form a composite recording signal; and a magnetic head for recording the composite recording signal on a magnetic tape in a manner in which a plurality of recording tracks are sequentially arranged and formed. When the first recording video signal is obtained from the recording video signal forming section, the pilot signal phase control means sets the phase set by phase reset processing of the pilot signal obtained from the pilot signal forming section. and a case where the second recording video signal is obtained from the recording video signal forming section.

In the magnetic recording device according to the present invention having the above-described configuration, when the composite recording signal is recorded on the magnetic tape by the magnetic head unit, the composite recording signal is reproduced at the first aspect ratio. In one case, the composite recording signal includes a first recording video signal based on a video signal from which an image screen can be obtained; In this case, the phase set by the phase reset process of the pilot signal recorded on the magnetic tape together with the first recording video signal or the second recording video signal is considered to be different.

Therefore, on a magnetic tape on which a composite recording signal has been recorded by the magnetic recording apparatus according to the present invention, the recorded video signal for recording can be reproduced on a reproduced image screen having a first aspect ratio of, for example, 4:3. The video signal that can be obtained and
For example, special information indicating which of the video signals from which a reproduced image screen having a second aspect ratio of 16:9 is generated is based on the phase state of the pilot signal. When the video signal is played back,
Based on the phase of the reproduced pilot signal, the recording video signal being recorded is formed based on a video signal that can obtain a reproduced image screen of the first aspect ratio, or, Automatic determination can be made as to whether the image has been formed based on a video signal from which a reproduced image screen having the second aspect ratio can be obtained.

G Example Configuration and operation of the G-1 embodiment (Figures 1 to 5) FIG. 1 shows an example of a magnetic recording device according to the present invention.

In FIG. 1, video signal input terminals 11 and 13 include
A first luminance signal Y1 and a first carrier color signal C1 forming a video signal for an aspect ratio of 4:3, or a second luminance signal Y2 forming a video signal for an aspect ratio of 16:9.
and a second carrier color signal C2.

The audio signal input terminal 15 also receives a first luminance signal Yl.
and the first carrier color signal C1 forms an aspect ratio of 4:
The first audio signal AUI accompanying the video signal for 3, or
A second audio signal AU2 accompanying a video signal for an aspect ratio I6:9 formed by a second luminance signal Y2 and a second carrier color signal C2 is supplied.

Further, a control signal input terminal 17 is provided, and the control signal input terminal 17 includes, for example, the video signal input terminal 11.
When the first luminance signal Y1 and the first carrier color signal CI constituting the video signal for the aspect ratio of 4:3 are supplied to the video signal input terminals 11 and 13, the level is low, and the video signal input terminals 11 and 13 are supplied with the video signal for the aspect ratio of 16. :The second component that constitutes the video signal for 9
An aspect ratio indication signal Cs is supplied which takes a high level when the luminance signal Y2 and the second carrier color signal C2 are supplied, respectively.

When the first luminance signal Y1 and the first carrier color signal C1 constituting the video signal for an aspect ratio of 4:3 are supplied to the video signal input terminals II and 13, respectively, the video signal input terminal 11 The first luminance signal Y1 is supplied to the luminance signal recording processing section 19. At this time, the aspect ratio instruction signal Cs that takes a low level is supplied to the luminance signal recording processing section 19, and accordingly, in the luminance signal recording processing section 19, based on the first luminance signal Y1, for example, The aspect ratio is 4:3 in which the carrier frequency shift band is such that the tip of the synchronization signal of the first luminance signal Yl has a frequency Fs = 5.7 MHz and the white peak has a frequency Fp = 7.7 MHz. A state is taken in which an FM brightness signal Yf is formed, and the brightness signal recording processing section 19 supplies an aspect ratio instruction signal Cs having a low level to produce a high-pass signal with a cut-off frequency of, for example, about 2 MHz. Filter<HPF)21, aspect ratio 4:3
FM! The i degree signal Yf is obtained, and it is sent to the signal synthesis section 23.
supplied to In addition, the first signal from the video signal input terminal 13
The conveyed color signal C1 is transmitted to the color signal recording processing units 25 and 270.
Supplied to both. In the color signal recording processing section 25,
Based on the first carrier color signal C1, for example, a low-pass conversion color signal Cc for an aspect ratio of 4:3 with a color subcarrier frequency Fc of about 743 KHz is formed, and is output from the color signal recording processing section 25. , bandpass filter (BPF) 29
Through this, a low frequency conversion color signal CC for an aspect ratio of 4:3 is obtained, and is supplied to the selection contact 31a of the switch 31. The switch 31 is supplied with the aspect ratio instruction signal C8 that takes a low level, and its movable contact 31c is connected to the selection contact 31a, so that the BPF
The low-frequency conversion color signal Cc for an aspect ratio of 4:3 from 29 is supplied to the signal synthesis section 23 through a switch 31.

In this way, the HPF2 supplied to the signal combining section 23
FM brightness signal Yf and BP for aspect ratio 4:3 from 1
Low frequency conversion color signal Cc for aspect ratio 4:3 from F29
constitutes a video signal for recording.

In addition, in such a case, the audio signal input terminal 15 receives the first audio signal AU accompanying the video signal for the aspect ratio of 4:3.
I is supplied, and the first signal from the audio signal input terminal 15
The audio signal AUI is supplied to the audio signal recording processing section 33. At this time, the audio signal recording processing section 33 is supplied with an aspect ratio instruction signal Cs that takes a low level.
Accordingly, in the audio signal recording processing section 33, the first
Based on the audio signal AUI of, for example, the carrier frequency Fa
is 1.5MHz, and the frequency deviation width is ±100 to 150K.
A state is taken in which a first FM audio signal Af of approximately Hz is formed, and the audio signal recording processing section 33 supplies an aspect ratio instruction signal Cs having a low level, so that the passband center frequency is approximately 1. A first FM audio signal Af is obtained through the BPF 35 set to .5 MHz, and is supplied to the signal synthesis section 23.

Furthermore, a pilot signal supply section 37 is provided,
The pilot signal supply unit 37 includes a pilot signal forming unit 41. A reset signal forming section 43 that resets the frequency division counter built in the pilot signal forming section 41. It is configured to include a pilot signal control section 45 that controls the pilot signal forming section 41 and a low pass filter (LPF) 47 connected to the output end of the pilot signal forming section 41. teeth,
An aspect ratio instruction signal C5 is supplied. Oscillation circuit 39
For example, when the horizontal frequency of the recording video signal is fH, the oscillation output signal So with a constant frequency of 378 f is supplied to the pilot signal forming section 41, and in the pilot signal forming section 41, the built-in frequency division The oscillation output signal SO is divided in four ways by the counter, and the frequency F1
゜F2. Pilot signal PI with F3 and F4.

F2. F3 and F4 are formed. Frequency Fl.

F2. F3 and F4 are each, for example, about 102.54
±100KHz, 118.95±100K
Hz, 165.21±10OK Hz, 148
．． 69±100KHz is selected.

The reset signal forming section 43 is supplied with the vertical synchronizing signal Vs in the recording video signal from the terminal 49, forms a reset signal Sr synchronized with the vertical synchronizing signal vs, and supplies it to the pilot signal forming section 41, A frequency dividing counter built in the pilot signal forming section 41 is reset by a reset signal Sr. Thereby, the pilot signal P formed in the pilot signal forming section 41
Each of 1 to P4 is the vertical period (
It is assumed that the phase reset process has been performed with the field period). The phases of each of the pilot signals P1 to P4 set by such phase reset processing are determined by the aspect ratio instruction signal C supplied to the pilot signal forming section 41.
When the aspect ratio indication signal Cs is at a low level, the phases of the pilot signals P1 to P4 are as shown in FIGS. 2A and B. It is set to 0@ to shorten the arrival time of the vertical synchronization signal Vs.

The pilot signal control unit 45 is supplied with a timing pulse signal Pv synchronized with the vertical synchronization signal Vs in the recording video signal from the terminal 51, and changes the high level and the low level in synchronization with the timing pulse m number Pv at two field periods. The pulse signal Pa as shown in FIG. 3 alternates with twice the period, and the high level and low level alternate with the period twice the period of the pulse signal Pa in synchronization with the rising edge of the pulse signal Pa. In this case, a pulse signal Pb as shown in FIG. Control. Control of the sending order of pilot signals P1 to P4 is as follows:
This is done according to the levels of pulse signals Pa and Pb, and when both pulse signal Pa and pulse signal pb take a high level, pilot signal P1 is sent out, and when pulse signal Pa takes a low level and pulse signal Pb goes high. When the pulse signal Pa takes a high level, the pilot signal P2 is sent out, and when the pulse signal pb takes a low level, the pilot signal P3 is sent out, and both the pulse signal Pa and the pulse signal Pb take a low level. Pilot signal P when taking
4 is sent.

Therefore, as shown in FIG. 3, pilot signals PL, P2 . P3 and F4 are sent out, respectively, and the state is repeated.

Each of the pilot signals P1 to P4 sent out from the pilot signal forming section 41 is supplied to the signal combining section 23 through the LPF 47.

In the signal synthesis unit 23, the FM luminance signal Yf for aspect ratio 4:3 from HPF 21, the low frequency conversion color signal Cc for aspect ratio 4:3 from switch 31, the first FM audio signal Af1 from BPF 35, and The pilot signals P1 to P4 from the LPF 47 are frequency multiplexed and combined to form a composite recording signal Sm for an aspect ratio of 4:3. Such a composite recording signal Sm for an aspect ratio of 4:3 is, for example, shown in the characteristic diagram of FIG. 4 (vertical axis: two level L, horizontal axis: frequency F).
As shown in , from the upper limit of the frequency band of the low frequency conversion color signal Cc for the aspect ratio 4:3
The first FM audio signal Af is arranged in a relatively narrow frequency band towards the lower limit side of the frequency band of the M luminance signal Yf, and further below the lower limit of the frequency band of the low frequency conversion color signal Cc for an aspect ratio of 4:3. It is assumed that a low, relatively narrow frequency band is allocated for pilot signals, and pilot signals P1 to P4 are arranged in this low frequency band.

The composite recording signal Sm for an aspect ratio of 4:3 obtained from the signal synthesizing section 23 is supplied to the rotating magnetic heads 55a and 55b through recording amplifying sections 53a and 53b, respectively.

The rotating magnetic heads 55a and 55b alternately scan the magnetic tape, and output a composite recording signal Sm for an aspect ratio of 4:3 onto the magnetic tape into a plurality of composite recording signals Sm in which portions corresponding to each field period of the video signal for recording are respectively recorded. Recording is performed in a manner in which inclined recording tracks are sequentially arranged. Thereby,
The inclined recording tracks arranged on the magnetic tape are divided into an FM luminance signal Yf for an aspect ratio of 4:3 and a low-frequency conversion signal for an aspect ratio of 4:3 for each set of four mutually adjacent inclined recording tracks. In addition to the recording video signal composed of the color signal Cc and the first FM audio signal Af, a reset process is performed so that the phase thereof becomes 0° in synchronization with the vertical synchronization signal Vs in the recording video signal. It is assumed that the pilot signals PI to P4 are sequentially recorded.

On the other hand, video signal input terminals 11 and 13 have an aspect ratio of 1.
When the second luminance signal ¥2 and the second carrier color signal C2 constituting the 6:9 video signal are respectively supplied, the second luminance signal Y2 from the video signal input terminal 11 is the luminance signal It is supplied to the recording processing section 19. At this time, the aspect ratio instruction signal Cs having a high level is supplied to the brightness signal recording processing section 19, and in accordance with this, the brightness signal recording processing section 19 performs, for example, based on the second brightness signal Y2. FM for aspect ratio 16:9 in which the carrier frequency shift band is such that the tip of the synchronization signal of the second luminance signal Y2 has a frequency Fs = 7.7 MH2 and the white peak has a frequency Fp = 9°7 MHz. Luminance signal Yf
' is formed, and the luminance signal recording processing unit 19
, an aspect ratio instruction signal Cs having a high level is supplied, and an FM luminance signal Yf'' for an aspect ratio of 16:9 is obtained through the HPF 21 whose cut-off frequency is set to, for example, approximately 3.3 MHz. The second carrier color signal C2 from the video signal input terminal 13 is supplied to both the color signal recording processors 25 and 27. At this time, the color signal recording processor 27 For example, a low-pass conversion color signal Cc'' for an aspect ratio of 16:9 is formed based on the second carrier color signal C2, with a color subcarrier frequency Fc'' of approximately 1.25 MHz. , a low frequency conversion color signal Cc' for an aspect ratio of 16:9 is obtained from the color signal recording processing section 25 through the BPF 57, and is supplied to the selection contact 31b of the switch 31.The switch 31 takes the high level. When the aspect ratio instruction signal Cs is supplied, the movable contact 31c becomes the selection contact 3.
1b, thereby causing BPF57
A low-pass conversion color signal Cc' for an aspect ratio of 16:9 is supplied to the signal synthesis section 23 through a switch 31.

In this way, the HPF2 supplied to the signal combining section 23
FM luminance signal Yf' for aspect ratio 16:9 from 1
and the low frequency conversion color signal Cc' for an aspect ratio of 16:9 from the BPF 57 constitute a video signal for recording.

In addition, in such a case, the second audio signal A accompanying the video signal for an aspect ratio of 16:9 is input to the audio signal input terminal 15.
A second audio signal AU2 from the audio signal input terminal 15 is supplied to the audio signal recording processing section 33. At this time, the audio signal recording processing section 33 is supplied with the aspect ratio instruction signal Cs having a high level, and accordingly, the audio signal recording processing section 33 outputs the second audio signal AU2 based on the second audio signal AU2. Carrier frequency F
a' is 2.4MHz and the frequency deviation width is ±100 to 15
A state is taken in which a second FM audio signal Af' having a frequency of about 0 KHz is formed, and the audio signal recording processing section 33 outputs the following:
BPF3 to which the aspect ratio instruction signal Cs having a high level is supplied and the pass band center frequency is set to approximately 2.4 MHz.
5, a second FM audio signal Af" is obtained and supplied to the signal synthesis section 23.

Furthermore, at this time, the pilot signal supply section 37 receives the frequencies Fl, F2 . Pilot signals PL, P2 .F3 and F4 respectively. For each of P3 and P4, the aspect ratio instruction is such that the phase set by phase reset processing with the vertical period (field period) in the recording video signal takes a high level that is supplied to the pilot signal forming section 41. In response to the signal Cs, as shown in FIG. 2A and C, the vertical synchronization signal V in the recording video signal is
The angle is 180° each time s arrives.

As shown in FIG. Vertical synchronization signal Vs
The pilot signals P1 to P4 are reset to 180 degrees each time the signal arrives, and are supplied to the signal combining section 23 through the LPF 47.

In the signal synthesis unit 23, the FM luminance signal Yf'' for an aspect ratio of 16:9 from the HPF 21, and the low frequency conversion color signals Cc' and B for an aspect ratio of 16:9 from the switch 31.
The second FM audio signal Af' from PF35 and L
The pilot signals P1 to P4 from the PF47 are frequency multiplexed and combined to form a composite recording signal Sm for an aspect ratio of 16:9.
' is formed. Such a composite recording signal Sm'' for an aspect ratio of 16:9 is, for example, a composite recording signal Sm for an aspect ratio of 4:3, as shown in the characteristic diagram of FIG. 5 (vertical axis: two level L, horizontal axis: frequency F). Aspect ratio included in 4:
From the upper limit of the frequency band of the low-pass conversion color signal Cc' for an aspect ratio of 16:9, which is higher than the frequency band of the low-pass conversion color signal Cc for an aspect ratio of 3, to the composite recording signal Sm for an aspect ratio of 4:3. The aspect ratio is set in a relatively narrow frequency band toward the lower limit of the frequency band of the FM brightness signal Yf' for the aspect ratio 16:9, which is higher than the frequency band of the FM brightness signal Yf for the aspect ratio 4:3 included. 4:
The first FM audio signal A included in the composite recording signal Sm for
A second FM audio signal Af' having a frequency band higher than f is arranged, and also has a relatively narrow frequency lower than the lower limit of the frequency band of the low-pass conversion color signal CC'' for an aspect ratio of 16:9. A band is allocated for pilot signals, and pilot signals PI to P4 are assigned to this low frequency band.
shall be allocated.

The composite recording signal Sm' for an aspect ratio of 16:9 obtained from the signal combining section 23 is supplied to rotating magnetic heads 55a and 55b through recording amplifying sections 53a and 53b, respectively. The rotary magnetic heads 55a and 55b alternately scan the magnetic tape, and produce a composite recording signal Sm' for an aspect ratio of 6:9 on the magnetic tape. Recording is performed in such a manner that the inclined recording tracks are sequentially arranged. As a result, the inclined recording tracks arranged in the magnetic tape have an FMli degree signal Yf'' for an aspect ratio of 16:9 and an aspect ratio of 16:9 for each set of four mutually adjacent inclined recording tracks. Low frequency conversion color signal Cc'
In addition to the recording video signal consisting of the recording video signal and the second FM audio signal Af', the recording video signal is reset in synchronization with the vertical synchronization signal ■S so that its phase becomes 180°. It is assumed that pilot signals P1 to P4 are recorded sequentially.

G-2 Modified Example (FIG. 6) In the above example, each of the pilot signals P1 to P4 sent from the pilot signal supply section 37 is input to the video signal input terminals 11 and 13 as a video signal for an aspect ratio of 4:3. A first luminance signal Y1 and a first carrier color signal C constituting
1 is supplied, a reset process is performed so that the phase thereof becomes 0° in synchronization with the vertical synchronization signal Vs in the recording video signal in accordance with the aspect ratio instruction signal Cs which is assumed to be at a low level, In addition, the video signal input terminal 11
and 13, respectively, are supplied with the second luminance signal Y2 and the second carrier color signal C2 constituting the video signal for the aspect ratio 16:9. However, the reset process is performed so that the phase thereof becomes 180° in synchronization with the vertical synchronization signal VS in the recording video signal, but the reset process for each phase of the pilot signals P1 to P4 is as follows. It may be done in a manner different from this. For example, video signal input terminals 11 and 13 have an aspect ratio of 4:3.
When the first luminance signal Y1 and the first carrier color signal CI constituting the video signal are supplied, the aspect ratio instruction signal Cs, which is assumed to be at a low level, is used as shown in FIG. 6A. As shown in FIG. 2, each of the pilot signals P1 to P4 is reset in synchronization with the vertical synchronization signal Vs in the recording video signal so that its phase becomes Oo, while the video signal input terminal 11 and 13, a second luminance signal Y constituting a video signal for an aspect ratio of 16:9.
When the second carrier color signal Cs and the second carrier color signal c2 are respectively supplied, the pilot signal P is output as shown in FIG.
Each of pilot signals P2 and P4 is reset in synchronization with the vertical synchronization signal Vs in the recording video signal so that its phase becomes Oo, and each of the pilot signals P2 and P4 is synchronized with the vertical synchronization signal Vs in the recording video signal. or, as shown in FIG. 6C, each of the pilot signals Pl and P2 is synchronized with the vertical synchronization signal Vs in the recording video signal. At the same time, each of the pilot signals P3 and P4 is reset to the vertical synchronization signal VS in the recording video signal.
A state is set in which the reset process is performed in synchronization with , so that the phase becomes 180°.

G-3 reproduction system (Fig. 7) Fig. 7 shows a composite recording signal Sm for an aspect ratio of 4:3 or a composite recording signal for an aspect ratio of 16:9 using an example of the magnetic recording device according to the present invention shown in Fig. 1. From the magnetic tape on which the signal Sm' is recorded, the first luminance signal Y1, the first carrier color signal c1, and the first audio signal AU1, or the aspect ratio, which constitute the video signal for an aspect ratio of 4:3. The second luminance signal Y2, the second carrier color signal C2, and the second audio signal AU2 that constitute the 6:9 video signal
An example of a reproducing system used for reproducing is shown below.

In the hermaphrodite system shown in FIG. 7, the rotating magnetic head 55a is the same as the recording system shown in FIG.
and 55b are provided as a reproducing rotary magnetic head that sequentially and alternately scans the inclined recording tracks arranged and formed on the magnetic tape.

Then, the rotating magnetic heads 55a and 55b generate a composite recording signal Sm for an aspect ratio of 4:3 or a composite recording signal Sm for an aspect ratio of 16 from each of the inclined recording tracks on the magnetic tape.
:9 composite recording signal Sm' is read out alternately in portions corresponding to each field period of the recording video signal, and after passing through reproduction amplification sections 61a and 61b, is converted into a series of signals by a switch 63.

The composite recording signal Sm for an aspect ratio of 4:3 or the composite recording signal Sm' for an aspect ratio of 16:9 obtained from the switch 63 is processed by the HPF65. HPF67 compatible with FM brightness signal Yf' for aspect ratio 16:9, aspect ratio 4:3
HPF69. corresponding to the low frequency conversion color signal Cc. HPF compatible with low frequency conversion color signal Cc' for aspect ratio 16:9
71, HPF 73 corresponding to the first FM audio signal Af;
The signal is supplied to an HPF 75 corresponding to the second FM audio signal Af'' and an HPF 77 whose passband is a frequency band including all pilot signals P1 to P4.

When the composite recording signal Sm for an aspect ratio of 4:3 is read out from the rotary magnetic heads 55a and 55b used as reproduction rotary magnetic heads, the composite recording signal Sm for an aspect ratio of 4:3 is read out from the HPF 77.
Pilot signals P1 to P4 are obtained which have been reset so that the phase thereof becomes 0° in synchronization with the vertical synchronizing signal VS in the recording video signal included in the 3-use composite recording signal Sm. Pilot signals P1 to P4 from BPF77
is supplied to the l-ranking error signal forming section 79,
In the tracking error signal forming section 79, a tracking error signal St is formed based on the pilot signals P1 to P4 to detect the deviation of the scanning trajectory of the rotating magnetic heads 55a and 55b on the magnetic tape from the center of each inclined recording track. be done. The tracking error signal St formed by the tracking error signal forming section 79 is then supplied to the tracking servo control section 81, and the tracking servo control section 81 performs tracking control based on the tracking error signal St.

In addition, the pilot signals P1 to P4 from the BPF77 are
Comparison signals P1', P2'' corresponding to the pilot signals P1 to P4, respectively, from the comparison signal supply section 85 are also supplied to one input terminal of the phase comparison section 83, and the other input terminal of the phase comparison section 83 .

P3'' and P4' are supplied.The comparison signal supply section 85 includes a comparison signal forming section 89 which includes a frequency division counter that divides the output of the oscillation circuit 871 and the oscillation circuit 87; It is configured to include a reset signal forming section 91 that resets the frequency division counter, a comparison signal control section 93 that controls the comparison signal forming section 89, and an LPF 95 connected to the output end of the comparison signal forming section 89.

The oscillation circuit 87 is supplied with a regenerated horizontal synchronization signal Hs from a luminance signal regeneration processing section 99, which will be described later.
378 f, a constant frequency oscillation output signal So”
is supplied to the comparison signal forming section 89, and in the comparison signal forming section 89, the oscillation output signal So' is divided in four ways by a built-in frequency division counter, and the frequencies Fl, F2 are
．． Comparison signals P1', P2'', P3 with F3 and F4
° and P4' are formed. The reset signal forming section 91 is supplied with the reproduced vertical synchronizing signal Vs from the luminance signal reproducing processing section 99, forms a reset signal Sr' synchronized with the vertical synchronizing signal Vs, and sends it to the comparison signal forming section 89. The frequency dividing counter built in the comparison signal forming section 89 is reset by the reset signal Sr'.

As a result, each of the comparison signals P1' to P4' formed in the comparison signal forming section 89 is subjected to phase reset processing with the field period of the recording video signal included in the composite recording signal Sm for an aspect ratio of 4:3. It is said that

The comparison signal control section 93 is supplied with a timing pulse signal Pv' synchronized with the vertical synchronization signal Vs regenerated in the luminance signal regeneration processing section 99 from a terminal 97, and outputs a high level and a low level in synchronization with the timing pulse signal Pv'. A pulse signal Pa' similar to the pulse signal Pa shown in FIG. and a pulse signal Pb similar to the pulse signal Pb shown in FIG. 2, which alternately takes a high level and a low level in synchronization with the rise of the pulse signal Pa' with a period twice the period of the pulse signal Pa'. ' and supplies them to the comparison signal forming section 89, thereby controlling the sending order of the comparison signals P1' to P4' from the comparison signal forming section 89. The sending order of the comparison signals P1' to P4' is controlled according to the levels of the pulse signals Pa and Pb', and when both the pulse signal Pa' and the pulse signal Pb' are at a high level, A comparison signal P1' is sent out in response to the pilot signal P1, and the pulse signal Pa' takes a low level and the pulse signal P
When b' takes a high level, a comparison signal P2' is sent out in response to the pilot signal P2 obtained from the BPF 77, and when pulse signal Pa' takes a high level and pulse signal Pb' takes a low level, A comparison signal P3' is sent out in response to the pilot signal P3 obtained from the BPF 77, and when both the pulse signal Pa' and the pulse signal Pb' take a low level, the comparison signal P3' is sent out in response to the pilot signal P4 obtained from the BPF 77. , a comparison signal P4' is sent out.

Comparison signals P1-P sent out from the comparison signal forming section 89
4' are supplied to the phase comparator 83 through the LPF 95, and the phase comparator 83 compares each of the pilot signals P1 to P4 obtained from the BPF 77 with the comparison signal PI'.
-P4' are compared in phase. In this case, the pilot signals P1 to P4 obtained from the BPF 77 are synchronized with the vertical synchronization signal Vs in the recording video signal included in the composite recording signal Sm for an aspect ratio of 4:3 so that the phase becomes Oo. Since it has been reset-processed, the comparison output signal Sp obtained from the phase comparator 83 assumes a low level at each supply point of each of the pilot signals PI to P4 and each of the comparison signals P1'' to P4''. The comparison output signal Sp from the phase comparator 83 is smoothed in LPFlol, and an aspect ratio discrimination signal Dp having a low level is obtained from LPFIOI.
It is sent to the aspect ratio determination output terminal 102.

In such a case, the FM luminance signal Yf for the aspect ratio of 4:3 is obtained from the HPF 65, and the FM luminance signal Yf for the aspect ratio of 4:3 is obtained from the
is supplied to the selection contact 103a.

The switch 103 is supplied with the aspect ratio discrimination signal Dp obtained from the LPF 101, and its movable contact 103c is connected to the selection contact 103a in response to the aspect ratio discrimination signal Dp which takes a low level. state, thereby giving an aspect ratio of 4 from HPF65.
:3 FM luminance signal Yf is supplied to the luminance signal reproduction processing section 99 through the switch 103. The luminance signal reproduction processing section 99 is supplied with an aspect ratio discrimination signal Dp obtained from the LPFIOI, and adjusts the aspect ratio to 4 in accordance with the aspect ratio discrimination signal Dp which takes a low level.
:3 FM luminance signal Yf is in a state where various processing including demodulation processing is performed, and from the luminance signal reproduction processing section 99,
A first luminance signal Y1 based on the FM luminance signal Yf for an aspect ratio of 4:3 is obtained, which is sent to the luminance signal output terminal 105 as a reproduced luminance signal, and a composite recording signal Sm for an aspect ratio of 4:3. A horizontal synchronization signal Hs and a vertical synchronization signal Vs in the recording video signal included in the recording video signal are obtained.

Further, a low frequency conversion color signal Cc for an aspect ratio of 4:3 is obtained from the BPF 69 and supplied to the color signal reproduction processing section 107 . The color signal reproduction processing unit 107 performs various processes including frequency conversion processing on the low-pass conversion color signal CC for an aspect ratio of 4:3. The first based on the color signal Cc
A carrier color signal C1 is obtained and supplied to the selection contact 109a of the switch 109. Switch 109 is LPFI
The aspect ratio discrimination signal DP obtained from the OI is supposed to be supplied, and the movable contact 109c is set to the selection contact 1 in response to the aspect ratio discrimination signal Dp which takes a low level.
As a result, the first carrier color signal C1 from the color signal reproduction processing section 107 is transmitted to the color signal output terminal 11 as a reproduced color signal through the switch 109.
Furthermore, the first FM audio signal Af is obtained from the BPF 73 and is supplied to the selection contact 113a of the switch 113. The switch 113 is supplied with the aspect ratio discrimination signal Dp obtained from the LPFIOl, and its movable contact 113c is connected to the selection contact 113a in response to the aspect ratio discrimination signal Dp which takes a low level. As a result, the first FM audio signal Af from the BPF 73 is supplied to the audio signal reproduction processing section 115 through the switch 113. The audio signal reproduction processing section 115
A state in which the aspect ratio discrimination signal Dp obtained from the LPFIOI is supplied, and various processes including demodulation processing for the first FM audio signal Af are performed in accordance with the aspect ratio discrimination signal DP which takes a low level. and outputs the first FM audio signal Af from the audio signal reproduction processing section 115.
A first audio signal AtJ1 based on is obtained and sent to the audio signal output terminal 117 as a reproduced audio signal.

On the other hand, a rotating magnetic head 55 serving as a reproducing rotating magnetic head
When the composite recording signal Sm' for an aspect ratio of 16:9 is read from a and 55b, synchronization is performed from the BPF 77 with the vertical synchronization signal Vs in the recording video signal included in the composite recording signal Srn' for an aspect ratio of 16:9. Then, pilot signals P1 to P4 are obtained which have been reset so that their phases become 180°. The pilot signals P1 to P4 from the BPF 77 are supplied to the tracking error signal forming section 79.
, a tracking error signal St is generated based on the pilot signals P1 to P4 to determine the deviation of the scanning trajectory of the rotary magnetic heads 55a and 55b on the magnetic tape from the center of each inclined recording track. The tracking error signal St formed by the tracking error signal forming section 79 is then supplied to the tracking servo control section 81, and the tracking servo control section 81 performs tracking control based on the tracking error signal St.

In addition, the pilot signals P1 to P4 from the BPF77 are
Comparison signals PI' and P2' corresponding to the pilot signals P1 to P4, respectively, from the comparison signal supply section 85 are also supplied to one input terminal of the phase comparison section 83, and the other input terminal of the phase comparison section 83 P3' and P4' are supplied. In such a case, the comparison signal supply section 85 receives the composite recording signal S for an aspect ratio of 16:9 from the comparison signal formation section 89.
Comparison signal P that is assumed to have been subjected to phase reset processing with the field period of the recording video signal included in m゛
1'' to P4' are sent out corresponding to the pilot signals P1 to P4 obtained from the BPF 77, respectively. Each of the comparison signals P1'' to P4' sent out from the comparison signal forming section 89 undergoes phase comparison through the LPF 95. 83, and in the phase comparator 83, the phases of each of the pilot signals P1 to P4 obtained from the BPF 77 and each of the comparison signals PI' to P4'' are compared.
The pilot signals P1 to P4 obtained from
Since the comparison output signal Sp obtained from the phase comparison section 83 is The comparison output signal S from the phase comparator 83 assumes a high level at each supply time.
p is smoothed in the LPFIOI, and an aspect ratio discrimination signal Dp having a high level is obtained from the LPF 101.
It is sent to the aspect ratio determination output terminal 102.

In such a case, the FM brightness signal Yf'' for aspect ratio 16:9 is obtained from the HPF 67, and the switch 1
03 selection contact 103b. At this time, the switch 103 selects the aspect ratio discrimination signal D which takes a high level.
p, the movable contact 103c becomes the selection contact 103b.
As a result, the FM 11 degree signal Yf' for an aspect ratio of 16:9 from the HPF67 is
The signal is supplied to the luminance signal reproduction processing section 99 through the switch 103. The brightness signal reproduction processing unit 99 sets the aspect ratio to 16:
FM for 9! The second luminance signal Y2 based on the FM luminance signal Yf" for an aspect ratio of 16:9 is obtained from the luminance signal reproduction processing section 99 by performing various processes including demodulation processing on the i-degree signal Yf'. , is sent to the brightness signal output terminal 105 as a reproduced brightness signal, and at the same time, a horizontal synchronization signal Hs and a vertical synchronization signal Vs in the recording video signal included in the composite recording signal Sm' for an aspect ratio of 16:9 are obtained. .

Further, a low-pass conversion color signal Cc' for asbestos [ratio 16:9] is obtained from the BPF 71 and is supplied to the color signal reproduction processing section 119. The color signal reproduction processing section 119 performs various processes including frequency conversion processing on the low-pass conversion color signal Cc' for an aspect ratio of 16:9.
19 to low-pass conversion color signal Cc for aspect ratio 16:9
A second carrier color signal C2 based on switch 1 is obtained.
09 selection contact 109b. At this time, the switch 109 selects the aspect ratio discrimination signal D which takes a high level.
p, the movable contact 109C becomes the selection contact 109b.
As a result, the second carrier color signal C2 from the color signal reproduction processing section 119 is connected to the switch 10.
9, the signal is sent to the color signal output terminal 111 as a reproduced color signal.

Further, a second FM audio signal Af' is obtained from the BPF 75 and supplied to the selection contact 113b of the switch 113. At this time, the switch 113 changes its movable contact 113c in response to the aspect ratio discrimination signal Dp which takes a high level.
is connected to the selection contact 113b, whereby the second FM audio signal Af' from the BPF 75 is supplied to the audio signal reproduction processing section 115 through the switch 113. The audio signal reproduction processing unit 115 takes a state in which it performs various processes including demodulation processing on the second FM audio signal Af'' in response to the aspect ratio discrimination signal Dp that takes a high level, and the audio signal reproduction processing unit 115 , a second audio signal AU2 based on the second FM audio signal Af' is obtained and sent to the audio signal output terminal 117 as a reproduced audio signal.

Effects of the Invention H As is clear from the above explanation, the magnetic recording device according to the present invention includes a recording video signal formed based on an input video signal and a pilot signal that are frequency-multiplexed and combined. When recording a composite recording signal that is supposed to be recorded on a magnetic tape using a magnetic head, it is possible for the composite recording signal to properly obtain a reproduced image screen having a first aspect ratio of, for example, 4:3. In the case where the composite recording signal includes a video signal for recording based on a video signal that can be used, for example, the composite recording signal is a video signal that can appropriately obtain a reproduced image screen with a second aspect ratio of 16:9. In the case where the second recording video signal is included based on the
The phases set by the phase reset processing of the pilot signal recorded on the magnetic tape together with the first recording video signal or the second recording video signal are different.

Thereby, the magnetic tape on which the composite recording signal has been recorded by the magnetic recording device according to the present invention is such that the recorded video signal for recording is a video image that can appropriately obtain a reproduced image screen having the first aspect ratio. Special information indicating which of the signals and the video signals from which the reproduced image screen of the second aspect ratio can be properly obtained is recorded as the phase state of the pilot signal. Therefore, when the video signal is reproduced, the recorded video signal is determined based on the phase of the reproduced pilot signal.
It is formed based on a video signal that can appropriately obtain a reproduced image screen with the first aspect ratio, or is formed based on a video signal that can appropriately obtain a reproduced image screen with the second aspect ratio. It will be possible to automatically determine whether the information has been formed based on the above information.

[Brief explanation of the drawing]

FIG. 1 is a block connection diagram showing an example of a magnetic recording device according to the present invention, FIG. 2 A, B, and C are waveform diagrams for explaining the example shown in FIG. 1, and FIG. The conceptual diagrams shown in FIGS. 4 and 5 are used to explain the sending state of the pilot signal according to the example shown in FIG. 1, and the conceptual diagrams shown in FIGS. 6A, B, and C are waveform diagrams used to explain variations of the example shown in FIG. 1, and FIG. A block connection diagram showing an example of a reproducing system used for reproducing signals from a magnetic tape, FIG. 8 is a conceptual diagram for explaining the manner in which pilot signals are recorded on a magnetic tape, and FIG. 9 shows an aspect of a reproduced image screen. It is a conceptual diagram provided for explanation of ratio. In the figure, 11 and 13 are video signal input terminals, 15 is an audio signal input terminal, 17 is a control signal input terminal, 19 is a luminance signal recording processing section, 23 is a signal synthesis section, 2b and 27 are color signal recording processing sections, 33 is an audio signal recording processing section, 37 is a pilot signal supply section, 39 is an oscillation circuit, and 41 is a Byron [・
The signal forming section 43 is a reset signal forming section, 45 is a pilot signal control section, and 55a and 55b are rotating magnetic heads. Figure 2 Phase relationship of pilot signals Figure 6 Recording pattern of pilot signals Figure 8 Reproduction image screen aspect ratio Figure 9 Circumference and branch number of image signal spectrum

Claims (1)

[Claims] A first recording video signal based on a video signal capable of obtaining a reproduced image screen having a first aspect ratio, and a second video signal for recording.
a recording video signal forming section that selectively forms a second recording video signal based on the video signal capable of obtaining a reproduced image screen with an aspect ratio of a pilot signal forming unit that obtains a pilot signal that is subjected to phase reset processing at regular intervals; and a pilot signal forming unit that generates a pilot signal that is subjected to phase reset processing at regular intervals; and pilot signal phase control means for controlling a pilot signal phase to be different when the first recording video signal is obtained from the recording video signal forming section and when the second recording video signal is obtained from the recording video signal forming section; a signal synthesizing means for forming a composite recording signal that includes a recording video signal or the second recording video signal and a pilot signal obtained from the pilot signal forming unit by frequency multiplexing; and A magnetic recording device comprising: a magnetic head section that records recording signals on a magnetic tape in a manner in which a plurality of recording tracks are sequentially arranged and formed.