JPH04238479A - Magnetic recording and/or reproducing device - Google Patents

Abstract

PURPOSE:To automatically discriminate the aspect ratio of a video signal by executing different phase modulation processing to a pilot signal whose phase is almost constant, frequency-multiplex-synthesizing the 1st and 2nd recording video signals and recording it. CONSTITUTION:A pilot phase control section 45 of a pilot signal supply section 37 applies phase modulation processing to pilot signals P1-P4 whose phase is almost constant from a pilot signal generating section 41 so as to make different phase change in the case of 1st recording video signals Y1-C1 and 2nd recording video signals Y2-C2 to obtain recording pilot signals P1'-P4'. A signal synthesis section 23 generates synthesized recording signals Sm, Sm' and rotary magnetic heads 55a, 55b record them on a magnetic tape TP. Thus, the reproduced pilot signal is used for discriminating automatically which of the aspect ratio of 4:3 or 16:9 the recording video signal carries.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention provides a method for rotating a synthesized recording signal obtained by frequency multiplexing and synthesizing a video signal including a luminance signal and a color signal and a pilot signal used for tracking control during playback, etc. Recording is performed on a magnetic tape using a magnetic head, and from the magnetic tape on which a composite recording signal obtained by frequency multiplexing the video signal and the pilot signal is recorded, the composite recording signal is recorded using a rotating magnetic head. Magnetic recording and/or reading and reproducing video signals
Or regarding a playback device.

0002

2. Description of the Related Art When a color television signal is recorded on a magnetic tape, in the conventional recording method, a luminance signal ( The FM luminance signal (hereinafter referred to as the FM luminance signal) and the 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 combined. A video signal for recording is recorded on the magnetic tape by a rotating magnetic head while sequentially forming inclined recording tracks.Furthermore, an audio signal is recorded on the magnetic tape by a fixed magnetic head along the running direction of the magnetic tape. It is recorded in such a way that an extended audio track is formed. In addition to this recording method, color video signals are being recorded on magnetic tape at a high density, and even though the running speed of magnetic tape is extremely low,
In order to maintain good quality of recorded and reproduced audio signals,
The frequency-modulated audio signal (hereinafter referred to as FM audio signal) is frequency-multiplexed and synthesized with the video signal and supplied to the rotating magnetic head, and the video signal is recorded on the inclined recording track on the magnetic tape where the video signal is originally recorded. A recording method has also been proposed in which recording is performed at the same time.

Furthermore, each of the inclined recording tracks on the magnetic tape corresponds to, for example, one vertical period of the video signal, ie, one vertical period of the video signal.
It is assumed that the field and the corresponding audio signal have been recorded, but in the playback system, a rotating magnetic head for extracting the video signal and audio signal from the magnetic tape is properly placed on each of the inclined recording tracks on the magnetic tape. It has been proposed to record a pilot signal used for tracking control in addition to the video signal and audio signal. The pilot signal in such a case is, for example, composed of four types of signals having mutually different frequencies, and these are sequentially recorded on each set of four mutually adjacent inclined recording tracks, as shown in FIG. As shown, among the inclined recording tracks sequentially arranged and formed on the magnetic tape TP, four inclined recording tracks T1, T2, T3 and T4 adjacent to each other forming a group Gt,
A pilot signal P1 with a frequency of F1, a pilot signal P2 with a frequency of F2, a pilot signal P3 with a frequency of F3, and a pilot signal P4 with a frequency of F4 are recorded, respectively. The frequencies F1 to F4 are selected such that, for example, F1<F2<F4<F3. Note that the arrow H in FIG. 7 indicates the moving direction of the magnetic tape TP.

[0004] In this way, 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 sequentially arranged on a magnetic tape. When recording is performed using the inclined recording track that is formed, the FM
the original luminance signal from which the luminance signal is to be formed; and
Conventionally, the original video signal including the original color signal on the basis of which the low-pass conversion color signal is formed is
Generally, the reproduced image screen properly obtained as a result has an aspect ratio of 4:3. However, with the increasing use of reproduced images from television signals, the reproduced image screen has been changed from having an aspect ratio of 4:3 as shown by the solid line in FIG. It has been proposed that the aspect ratio be, for example, 16:9, as shown by the dashed line in enlarged FIG. The FM luminance signal and the low-frequency conversion color signal constituting the video signal are respectively video signals whose reproduced image screen that can be properly obtained has an aspect ratio of 16:9 (hereinafter referred to as a video signal for an aspect ratio of 16:9). Increasingly, a video signal is formed based on a luminance signal and a carrier color signal.

[0005] The video signal for an aspect ratio of 16:9 is compared to a video signal in which a 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). In response 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 low-frequency conversion color signal that constitute the video signal for recording are respectively formed based on the video signal for aspect ratio 4:3. Compared to the signal, for example, the occupied frequency band is shifted to the higher frequency side and expanded.

[0006]

[Problem to be Solved by the Invention] As described above, an F.
A slanted recording track 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 M luminance signal and a low frequency conversion color signal is sequentially arranged on a magnetic tape. The FM audio signal and the pilot signal are frequency-multiplexed onto the video signal for recording consisting of the FM luminance signal and the low frequency conversion color signal, which is formed based on the video signal for an aspect ratio of 16:9. When a composite recording signal obtained by combining is to be recorded on a magnetic tape with inclined recording tracks sequentially arranged and formed, conventionally, the magnetic tape on which the composite recording signal is recorded is for,
Special information indicating whether the video signal for recording included in the composite recording signal was formed based on a video signal for an aspect ratio of 4:3 or a video signal for an aspect ratio of 16:9 is Not recorded. 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 aspect ratio is 16:
Even though the recording video signal formed based on the 9:3 aspect ratio video signal is recorded, the reading output signal from the magnetic tape is the recording video signal formed based on the 4:3 aspect ratio video signal. The same playback processing as when a video signal for a 4:3 aspect ratio is recorded, and the same image display as when a recording video signal formed based on a video signal for an aspect ratio of 4:3 is recorded. As a result, there is a possibility that an appropriate reproduced image screen may not be obtained.

In view of the above, the present invention provides 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 and combined. When recording on a magnetic tape using a magnetic head unit, when the magnetic tape on which a composite recording signal is recorded is used for reproducing a video signal, the video signal for recording recorded on the magnetic tape is, for example, Is it formed based on a video signal that can properly obtain a reproduced image screen with a first aspect ratio of 16:3, or a second aspect ratio of 16:9, for example? To provide a magnetic recording device capable of automatically determining whether a reproduced image screen has been formed based on a video signal that can properly obtain it by using a pilot signal. The first
The purpose of

The present invention also provides a method for generating a composite recording signal using a magnetic head unit from a magnetic tape on which a composite recording signal containing a recording video signal and a pilot signal are frequency-multiplexed and combined. When reading the video signal and reproducing the video signal, the recording video signal recorded on the magnetic tape is a video signal that can properly obtain a reproduced image screen having a first aspect ratio of, for example, 4:3. or whether it is formed based on a video signal that can properly obtain a reproduced image screen with a second aspect ratio, for example, 16:9. A second object of the present invention is to provide a magnetic reproducing device that can perform automatic determination based on a regenerated pilot signal.

[0009]

[Means for Solving the Problems] In order to achieve the above-mentioned first object, a magnetic recording device according to the present invention provides a first magnetic recording device based on a video signal capable of obtaining a reproduced image screen having a first aspect ratio. A recording video signal and a second video signal based on the video signal that can obtain a reproduced image screen with a second aspect ratio.
a recording video signal forming section that selectively forms a recording video signal; a pilot signal forming section that sends out a pilot signal whose phase is approximately constant; and a pilot signal forming section that sends out a pilot signal whose phase is approximately constant; A pilot signal phase control section that performs modulation processing to obtain a recording pilot signal, and a first recording video signal or a second recording video signal and a recording pilot signal obtained from the pilot signal phase control section are frequency-multiplexed. A signal combining means for forming a combined recording signal to be combined and included; a magnetic head unit for recording the combined recording signal on a magnetic tape in a manner in which a plurality of recording tracks are sequentially arranged; The phase control section changes the phase change state of the pilot signal obtained from the pilot signal forming section into two cases: when a first recording video signal is obtained from the recording video signal forming section and when a second recording video signal is obtained from the recording video signal forming section. The configuration is different depending on when a video signal is obtained.

Further, in order to achieve the above-mentioned second object, the magnetic reproducing apparatus according to the present invention provides a first recording video signal based on a video signal capable of obtaining a reproduced image screen having a first aspect ratio. Alternatively, a second recording video signal based on a video signal that can obtain a reproduced image screen with a second aspect ratio, a case accompanied by a first recording video signal, and a second recording video signal
From the magnetic tape on which the recording pilot signal obtained from the pilot signal phase control unit that performs phase modulation processing on the pilot signal to make the phase change state different depending on the case where the recording video signal is accompanied by the recording video signal, Alternatively, a magnetic head section that reads out a second recording video signal and an associated recording pilot signal, and a video that obtains a reproduced video signal based on the first or second recording video signal read by the magnetic head section. A signal reproducing section, a pilot signal phase detection section that performs phase detection on the recording pilot signal read by the magnetic head section, and a recording pilot signal that is detected by the magnetic head section based on the detection output signal from the pilot signal phase detection section. a discrimination signal forming section that forms a discrimination signal for discriminating between a state in which the first recording video signal is read out together with the signal and a state in which the second recording video signal is read out together with the recording pilot signal by the magnetic head section; It consists of

[0011]

[Operation] In the magnetic recording device according to the present invention configured as described above, when the composite recording signal is recorded on the magnetic tape by the magnetic head section, the composite recording signal has a first aspect ratio. A first recording video signal based on a video signal from which a reproduced image screen can be obtained, and a composite recording signal based on a video signal from which a reproduced image screen with a second aspect ratio can be obtained. The phase change state of the pilot signal recorded on the magnetic tape together with the first recording video signal or the second recording video signal is different depending on whether the pilot signal includes the second recording video signal or the second recording video signal. Ru.

Therefore, the magnetic tape on which the composite recording signal has been recorded by the magnetic recording apparatus according to the present invention is such that the recorded recording video signal can be reproduced at a first aspect ratio of, for example, 4:3. Which one of the video signal that can obtain an image screen and the video signal that can obtain a reproduced image screen with a second aspect ratio of 16:9, for example, is it formed based on? It is assumed that special information indicating the phase change state of the pilot signal is recorded as the phase change state of the pilot signal. The recorded video signal is
The image is formed based on a video signal that can obtain a reproduced image screen having a first aspect ratio, or it is formed based on a video signal that can obtain a reproduced image screen having a second aspect ratio. Automatic determination can be made as to whether the

Further, in the magnetic reproducing apparatus according to the present invention configured as described above, the magnetic head unit reads a composite recording signal from the magnetic tape, and furthermore, the magnetic head unit reads the composite recording signal from the magnetic tape, and furthermore, When a video signal is reproduced, a first video signal based on a video signal that can obtain a reproduced image screen with a first aspect ratio of, for example, 4:3 is selected from among the composite recording signals obtained from the magnetic head unit. There is a phase change in the case of accompanying a recording video signal and the case of accompanying a second recording video signal based on a video signal that can obtain a reproduced image screen with a second aspect ratio, for example, 16:9. A state in which phase detection is performed on the recording pilot signal which is set to have a different state, and the first recording video signal is read out together with the recording pilot signal by the magnetic head unit based on the detection output signal. A determination signal is formed to identify the state in which the second recording video signal is read out together with the recording pilot signal by the magnetic head section.

[0014] Therefore, from the recording pilot signal in the composite recording signal read from the magnetic tape, the composite recording signal read from the magnetic tape is a composite recording signal based on a video signal that can obtain a reproduced image screen having a first aspect ratio. The combined recording signal may include a second recording video signal based on a video signal that allows a reproduced image screen with a second aspect ratio to be obtained. Based on such a discrimination signal, the composite recording signal read from the magnetic tape is determined to include the first recording video signal. Automatic discrimination is made as to whether the second recording video signal is included, and the reproduction processing of the video signal is appropriately performed in accordance with the discrimination signal.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of a magnetic recording apparatus according to the present invention.

In FIG. 1, video signal input terminals 11 and 13 are provided with a first luminance signal Y1 and a first carrier color signal C1 constituting a video signal for an aspect ratio of 4:3, or a first luminance signal Y1 and a first carrier color signal C1 for an aspect ratio of 16:9. A second luminance signal Y2 and a second carrier color signal C2 constituting the video signal are supplied. Furthermore, the audio signal input terminal 15 receives a first luminance signal Y1.
and the first carrier color signal C1 forms an aspect ratio of 4:
The first audio signal AU1 accompanying the video signal for 3, or
A second audio signal AU2 is supplied along with a video signal for an aspect ratio of 16:9 formed by a second luminance signal Y2 and a second carrier color signal C2.

Further, a control signal input terminal 17 is provided, and the control signal input terminal 17 receives, for example, a first luminance signal constituting a video signal for an aspect ratio of 4:3 to the video signal input terminals 11 and 13. Y1 and first carrier color signal C
A second luminance signal Y2 and a second carrier color signal C2 take a low level when 1 is supplied to the video signal input terminals 11 and 13, respectively, and constitute a video signal for an aspect ratio of 16:9.
An aspect ratio indicating signal Cs is supplied which takes a high level when each of the following is supplied.

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 11 and 13, respectively, the video signal input First luminance signal Y1 from terminal 11
is supplied to the luminance signal recording processing section 19. At this time,
The luminance signal recording processing section 19 is supplied with an aspect ratio instruction signal Cs that takes a low level, and accordingly, the luminance signal recording processing section 19 calculates, for example, carrier frequency polarization based on the first luminance signal Y1. The leading edge of the synchronization signal of the luminance signal Y1 whose transition band is the first is frequency Fs=5.7 MHz
Therefore, the white peak has a frequency Fp = 7.7 MH
A state is taken in which an FM brightness signal Yf for an aspect ratio of 4:3 is formed, and the brightness signal recording processing section 19 outputs an aspect ratio instruction signal Cs having a low level.
An FM luminance signal Yf for an aspect ratio of 4:3 is obtained through a high-pass filter (HPF) 21 having a cutoff frequency of, for example, approximately 2 MHz, and is supplied to a signal synthesizing section 23. Further, the first carrier color signal C1 from the video signal input terminal 13 is supplied to both the color signal recording processing sections 25 and 27. In the color signal recording processing unit 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, which has a color subcarrier frequency Fc of about 743 KHz, is generated. A band pass filter (B
PF) 29, a low frequency conversion color signal Cc for the aspect ratio of 4:3 is obtained, which is applied to the selection contact 31 of the switch 31.
supplied to a. The switch 31 is supplied with an aspect ratio instruction signal Cs that takes a low level, and its movable contact 31
c is connected to the selection contact 31a, whereby the low-pass conversion color signal Cc for an aspect ratio of 4:3 from the BPF 29 is supplied to the signal synthesis section 23 through the switch 31.

The FM luminance signal Yf for an aspect ratio of 4:3 from the HPF 21 and the low-frequency converted color signal Cc for an aspect ratio of 4:3 from the BPF 29 supplied to the signal synthesis unit 23 in this way are Configure the signal.

In addition, in such a case, the audio signal input terminal 15 is supplied with the first audio signal AU1 accompanying the video signal for the aspect ratio of 4:3, and the audio signal input terminal 1
The first audio signal AU1 from 5 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 having a low level, and in response to this, the audio signal recording processing section 33 uses, for example, a carrier wave frequency Fa of 1.5 MHz, based on the first audio signal AU1. Frequency deviation width is ±1
A state is taken in which a first FM audio signal Af having a frequency of approximately 00 to 150 KHz is formed, and the audio signal recording processing section 33 outputs an aspect ratio instruction signal Cs having a low level.
A first FM audio signal Af is obtained through the BPF 35 to which the passband center frequency is set to approximately 1.5 MHz, and is supplied to the signal synthesis section 23.

Furthermore, a pilot signal supply section 37 is provided, and the pilot signal supply section 37 is connected to the oscillation circuit 3.
9. A pilot signal forming section 41 that has a built-in frequency division counter that divides the output of the oscillation circuit 39; a pulse signal forming section 43 that supplies a control pulse signal to the pilot signal forming section 41;
, a phase control section 45 and a switch 46 connected to the output end of the pilot signal formation section 41, a control signal generation section 47, and a switch 49 disposed between the control signal generation section 47 and the phase control section 45. It consists of switch 4
6 is supplied with an aspect ratio instruction signal Cs. For example, the oscillation circuit 39 sets the horizontal frequency of the recording video signal to f.
An oscillation output signal So with a constant frequency of 378fH is supplied to the pilot signal forming section 41, and in the pilot signal forming section 41, the oscillation output signal So is divided in four ways by a built-in frequency division counter. Thus, pilot signals P1, P2, P3 and P4 having frequencies F1, F2, F3 and F4 and substantially constant amplitudes are formed. Frequencies F1, F2, F3 and F4 are, for example, approximately 102.54±100 KHz, 1
18.95±100 KHz, 165.21±100
KHz, 148.69±100KHz is selected.

The pulse signal forming section 43 is supplied with a timing pulse signal Pv synchronized with the vertical synchronization signal Vs in the recording video signal from a terminal 51, and changes the high level and low level in synchronization with the timing pulse signal Pv in a field period. The pulse signal Pa as shown in FIG. The pulse signals Pb as shown in C in FIG. Control the sending order. Control of the sending order of pilot signals P1 to P4 is performed according to the levels of pulse signals Pa and Pb. When both pulse signals Pa and pulse signals Pb are at a high level, pilot signal P1 is sent out, and pulse signal Pa When the pulse signal Pb takes a low level and the pulse signal Pb takes a high level, the pilot signal P2 is sent out, and when the pulse signal Pa takes a high level and the pulse signal Pb takes a low level, the pilot signal P3 is sent out.
When both the signal and the pulse signal Pb are at low level, the pilot signal P4 is sent out. Therefore, as shown in A of FIG. 2, the pilot signals P1, P2,
P3 and P4 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 phase control section 45 and to the selection contact 46a of the switch 46. The operation of the switch 46 is controlled by the aspect ratio instruction signal Cs, and when the aspect ratio instruction signal Cs takes a low level, the movable contact 46c
is connected to the selection contact 46a, and when the aspect ratio instruction signal Cs takes a high level, the movable contact 46c is connected to the selection contact 46b. Therefore, in this case, the switch 4
6 is in a state where its movable contact 46c is connected to the selection contact 46a, and the pilot signals P1 to P4 having frequencies F1, F2, F3 and F4, respectively, sent from the pilot signal forming section 41 are directly transmitted to the switch. 46 through the selection contact 46a and movable contact 46c to the output side of the switch 46, and the recording pilot signals P1', P
2', P3' and P4'. Therefore, the recording pilot signals P1' to P4' have constant phases. The recording pilot signals P1' to P4' obtained from the switch 46 in this way are sent to the signal combining section 23.
supplied to

In the signal synthesis section 23, the FM luminance signal Yf for the aspect ratio 4:3 from the HPF 21, the low frequency conversion color signal Cc for the aspect ratio 4:3 from the switch 31,
The first FM audio signal Af from the BPF 35 and the recording pilot signals P1' to P4' from the switch 46 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, a low-frequency conversion color signal for an aspect ratio of 4:3, as shown in the characteristic diagram of FIG. 3 (vertical axis: level L, horizontal axis: frequency F). The first FM audio signal Af is arranged in a relatively narrow frequency band from the upper limit of the frequency band of Cc to the lower limit of the frequency band of the FM luminance signal Yf for an aspect ratio of 4:3, and A relatively narrow frequency band lower than the lower limit of the frequency band of the low-pass converted color signal Cc is allocated for the pilot signal, and the recording pilot signals P1' to P1 are allocated to this low frequency band.
4' shall be placed.

The composite recording signal Sm for an aspect ratio of 4:3 obtained from the signal synthesizing section 23 is transmitted to recording amplifying sections 53a and 5.
3b, it is supplied to rotating magnetic heads 55a and 55b, respectively. The rotating magnetic heads 55a and 55b alternately scan the magnetic tape TP', and record a composite recording signal Sm for an aspect ratio of 4:3 on the magnetic tape TP', respectively, by recording portions corresponding to each field period of the recording video signal. Recording is performed in such a manner that a plurality of inclined recording tracks are sequentially arranged. As a result, the inclined recording tracks arranged on the magnetic tape TP' have an aspect ratio of 4:4 for each set of four mutually adjacent inclined recording tracks.
A video signal for recording consisting of an FM luminance signal Yf for 3:3 and a low-pass conversion color signal Cc for 4:3 aspect ratio;
In addition to the FM audio signal Af, recording pilot signals P1' to P4' each having a constant phase are sequentially recorded.

On the other hand, when the second luminance signal Y2 and the second carrier color signal C2 constituting the video signal for an aspect ratio of 16:9 are supplied to the video signal input terminals 11 and 13, respectively, the video signal input Second luminance signal Y2 from terminal 11
is supplied to the luminance signal recording processing section 19. At this time,
The brightness signal recording processing unit 19 is supplied with an aspect ratio instruction signal Cs that takes a high level, and accordingly, the brightness signal recording processing unit 19 calculates, for example, carrier frequency polarization based on the second brightness signal Y2. The leading edge of the synchronization signal of the luminance signal Y2 whose transfer band is the second is the frequency Fs'=7.7 MH
z and the white peak has a frequency Fp' = 9.7
FM for aspect ratio 16:9, which is supposed to be MHz
A state is taken in which a luminance signal Yf' is formed, and the aspect ratio instruction signal Cs having a high level is supplied from the luminance signal recording processing section 19, so that the cut-off frequency is set to about 3.3, for example.
Through HPF21 set to MHz, aspect ratio 1
A 6:9 FM luminance signal Yf' is obtained and supplied to the signal synthesis section 23. Further, the second carrier color signal C2 from the video signal input terminal 13 is supplied to both the color signal recording processing sections 25 and 27. At this time, in the color signal recording processing section 27, based on the second carrier color signal C2, the color subcarrier frequency Fc' is set to about 1.25 MHz, for example, a low frequency band for an aspect ratio of 16:9. A converted color signal Cc' is formed and sent from the color signal recording processing section 27 to the BPF.
57, a low frequency conversion color signal Cc' for an aspect ratio of 16:9 is obtained, which is applied to the selection contact 31b of the switch 31.
supplied to The switch 31 is supplied with an aspect ratio instruction signal Cs that takes a high level, and its movable contact 31c
is connected to the selection contact 31b, whereby the low frequency conversion color signal Cc' for an aspect ratio of 16:9 from the BPF 57 is supplied to the signal synthesis section 23 through the switch 31.

The FM luminance signal Yf' for an aspect ratio of 16:9 from the HPF 21 and the low-frequency converted color signal Cc' for an aspect ratio of 16:9 from the BPF 57 supplied to the signal synthesizing section 23 in this way are Configure the video signal for use.

In such a case, the audio signal input terminal 15 receives the second signal accompanying the video signal for an aspect ratio of 16:9.
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 3
3 is supplied with an aspect ratio instruction signal Cs that takes a high level, and accordingly, in the audio signal recording processing section 33, based on the second audio signal AU2, for example, the carrier wave frequency Fa' is set to 2. .4 MHz and a frequency deviation width of about ±100 to 150 KHz is formed, and the audio signal recording processing unit 33 issues an aspect ratio instruction to take a high level. Signal Cs is supplied and the passband center frequency is approximately 2.4M
A second FM audio signal Af' is obtained through the BPF 35 set to Hz, and is supplied to the signal synthesis section 23.

Furthermore, in the pilot signal supply section 37, the frequencies F1 and F from the pilot signal forming section 41 are
2, F3 and F4, respectively.
A pilot signal P1 sent from a control signal generation section 47 is supplied to a phase control section 45 to which signals P2, P3, and P4 are supplied.
, P2, P3, and P4, the smallest among the frequency differences between adjacent pilot signals, for example, the pilot signal P
16K, which is the frequency difference between P1 and pilot signal P2.
A control signal Sa in the form of a rectangular pulse signal having a frequency of 1/2 Hz or less, thus 8 KHz or less, and a duty factor of 50% is also supplied via the switch 49.

The control signal generator 47 is supplied with the timing pulse signal Pv from the terminal 51, and the phase of the control signal Sa sent from the control signal generator 47 is reset to a constant phase state by the timing pulse signal Pv. be done. That is, the control signal Sa, which is a rectangular wave pulse signal with a frequency of 8 KHz or less and a duty factor of 50%, has a constant phase state every time the vertical synchronization signal Vs in the recording video signal arrives. The phase is assumed to be the same in each field period of the recording video signal. Further, the switch 49 is supplied with the pulse signal Pa from the pulse signal forming section 43, and when the pulse signal Pa takes a low level, the switch 49 is turned off and the pulse signal Pa is turned off.
It is assumed to be in the on state when it takes a high level.

Therefore, the phase control section 45 includes the switch 4
The control signal Sa through 9 is supplied in every other field period in which the pulse signal Pa is at a high level, that is, in the field period in which the pilot signal P1 or P3 is sent out from the pilot signal forming section 41, and is supplied to the phase control section 45. , phase modulation processing is performed on each of the pilot signals P1 and P3 based on the control signal Sa,
Since the control signal Sa is not supplied to each of the pilot signals P2 and P4, no substantial phase modulation processing is performed. The phase modulation processing based on the control signal Sa performed on each of the pilot signals P1 and P3 in the phase control unit 45 inverts the phase of each of the pilot signals P1 and P3 for each low level part and high level part of the control signal Sa. 180 to each of the pilot signals P1 and P3 according to the low level part and high level part of the control signal Sa.
It is assumed that the phases are different from each other by °(π).

As a result, the phase control section 45 outputs pilot signals P1 and P3 that have been phase modulated (phase inverted) based on the control signal Sa every other field period.
are obtained alternately, and in every other field period, pilot signals P2 and P without phase modulation are obtained.
4 are obtained alternately. Therefore, the four consecutive field periods Fd1, Fd2, Fd in the above-mentioned recording video signal
3 and Fd4, the field period Fd1 is subjected to phase modulation based on the control signal Sa as shown in A of FIG.
A pilot signal P1 as shown in B of FIG. 4 is obtained which alternately has phases different by 180°, and a pilot signal P2 without phase modulation as shown in C of FIG. 4 is obtained in the field period Fd2. field period F
d3 is subjected to phase modulation based on the control signal Sa as shown in A of FIG.
A pilot signal P3 as shown in D of FIG. 4 is obtained, and a pilot signal P4 without phase modulation as shown in E of FIG. Supplied.

At this time, the switch 46 closes its movable contact 4 in response to the aspect ratio instruction signal Cs which assumes a high level.
6c is connected to the selection contact 46b, and the pilot signals P1 and P3 are phase-modulated based on the control signal Sa, which is sent out from the phase control unit 45 and is obtained alternately every other field period. Pilot signals P2 and P4, which are not phase modulated and are obtained alternately every other field period, are led to the output side of the switch 46 through the selection contact 46b and the movable contact 46c of the switch 46, and are used for recording. Pilot signals P1', P2
', P3' and P4'. Therefore, the recording pilot signals P1' and P3' are assumed to have phase inversion changes due to phase modulation based on the control signal Sa, and the recording pilot signals P2' and P4' are assumed to have a constant phase. be done. The recording pilot signals P1', P2', P3' and P4' obtained from the switch 46 in this manner are supplied to the signal combining section 23.

In the signal synthesis section 23, the FM brightness signal Yf' for the aspect ratio 16:9 from the HPF 21, the low frequency conversion color signal Cc' for the aspect ratio 16:9 from the switch 31, and the second FM luminance signal Yf' for the aspect ratio 16:9 from the BPF 35. audio signal Af',
and a recording pilot signal P1' from the switch 46.
~P4' is frequency-multiplexed and has an aspect ratio of 16:
A composite recording signal Sm' for 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: level L, horizontal axis: frequency F). From the upper limit side of the frequency band of the low-pass conversion color signal Cc' for the aspect ratio 16:9, which is higher than the frequency band of the low-pass conversion color signal Cc for the aspect ratio 4:3 included in the aspect ratio 4: The lower limit of the frequency band of the FM luminance signal Yf' for an aspect ratio of 16:9, which is higher than the frequency band of the FM luminance signal Yf for an aspect ratio of 4:3 included in the composite recording signal Sm for an aspect ratio of 3. A second FM audio signal Af' having a higher frequency band than the first FM audio signal Af included in the composite recording signal Sm for an aspect ratio of 4:3 is disposed in a narrow frequency band, and A relatively narrow frequency band lower than the lower limit of the frequency band of the low frequency conversion color signal Cc' for a ratio of 16:9 is allocated for the pilot signal, and the recording pilot signals P1' to P4' are allocated to this low frequency band. It is assumed that it will be done.

The composite recording signal Sm' for an aspect ratio of 16:9 obtained from the signal synthesizing section 23 is supplied to rotating magnetic heads 55a and 55b through recording amplifying sections 53a and 53b, respectively. The rotating magnetic heads 55a and 55b are
The magnetic tape TP' is scanned alternately, and a composite recording signal Sm' for an aspect ratio of 16:9 is recorded on the magnetic tape TP' by a plurality of inclined recording tracks in which portions corresponding to each field period of the recording video signal are respectively recorded. are recorded in a manner in which they are sequentially arranged. Thereby, the inclined recording tracks arranged in an array on the magnetic tape TP' are arranged so that the FM luminance signal Yf' for the aspect ratio of 16:9 and the aspect ratio of 16:9 are set for each set of four mutually adjacent inclined recording tracks.
: a recording video signal composed of a low frequency conversion color signal Cc' for 9, and a recording pilot signal P1' which is phase-modulated based on a control signal Sa in addition to a second FM audio signal Af'. A recording pilot signal P2' that has a constant phase, a recording pilot signal P3' that has undergone phase modulation based on the control signal Sa, and a recording pilot signal P4' that has a constant phase. are recorded sequentially.

In the above example, the recording pilot signals P1' to P sent out from the pilot signal supply section 37 are
4' assumes a high level when the second luminance signal Y2 and the second carrier color signal C2 constituting the video signal for an aspect ratio of 16:9 are supplied to the video signal input terminals 11 and 13, respectively. According to the aspect ratio instruction signal Cs,
Of these, the recording pilot signals P1' and P3' are said to have undergone phase modulation based on the control signal Sa, and the recording pilot signals P2' and P4' are said to have a constant phase. is different, and depending on the aspect ratio instruction signal Cs which is assumed to take a high level,
Each of the recording pilot signals P1' to P4' may be phase-modulated based on the control signal Sa.

[0037] Also, recording pilot signals P1' to P4
The phase change state of each or a part of them is inverted for each low level part and high level part of the control signal Sa, like the above-mentioned recording pilot signals P1' and P3'. Not only are the phases different from each other by 180 degrees alternately taken depending on the low level part and the high level part of Sa, respectively, but also the phases differing from each other by 180 degrees are determined according to a predetermined control signal, for example, by 1 of the period of the control signal Sa. /2 periods each time 0
, π/2, π, 3π/4, etc. may be repeated.

In addition, for example, the first video signal forming the video signal for the aspect ratio of 4:3 is connected to the video signal input terminals 11 and 13.
When the luminance signal Y1 and the first carrier color signal C1 are respectively supplied, the recording pilot signals P1' to P
It is assumed that all or part of 4' is phase modulated based on a control signal such as the control signal Sa, and
Aspect ratio 16:9 for video signal input terminals 11 and 13
When the second luminance signal Y2 and the second carrier color signal C2 constituting the recording video signal are supplied, the recording pilot signal P1'~P4' may have a constant phase, and furthermore, the first luminance signal Y1 and the first luminance signal constituting the video signal for an aspect ratio of 4:3 may be input to the video signal input terminals 11 and 13. When the carrier color signal C1 is supplied, respectively, and the video signal input terminals 11 and 13
When the second luminance signal Y2 and the second carrier color signal C2 constituting the video signal for an aspect ratio of 16:9 are supplied to the recording pilot signals P1' to P1', respectively,
All or part of 4' may be phase modulated in a different manner.

FIG. 6 shows an example of a magnetic reproducing device according to the present invention, and this example is a composite recording signal Sm for an aspect ratio of 4:3 or an aspect ratio of 4:3 by the example of the magnetic recording device according to the present invention shown in FIG. Synthetic recording signal Sm for ratio 16:9
From the magnetic tape TP on which ' is recorded, the aspect ratio is 4.
:The first luminance signal Y1 and the first luminance signal that constitute the video signal for
carrier color signal C1 and first audio signal AU1, or
A second luminance signal Y2, a second carrier color signal C2, and a second audio signal A constituting a video signal for an aspect ratio of 16:9.
It is said to be used to reproduce U2.

In the example of the magnetic reproducing apparatus shown in FIG. 6, rotating magnetic heads 55a and 55b, which are common to the example of the magnetic recording apparatus shown in FIG.
It is provided as a reproducing rotary magnetic head that sequentially and alternately scans inclined recording tracks arranged on P'. Then, the composite recording signal Sm for aspect ratio 4:3 or the composite recording signal Sm' for aspect ratio 16:9 is outputted from each of the inclined recording tracks on magnetic tape TP' by the rotating magnetic heads 55a and 55b into a recording video image. Portions corresponding to each field period of the signal are read out alternately,
After passing through the regenerative amplification sections 61a and 61b, the switch 63
This results in a series of signals.

Aspect ratio 4 obtained from switch 63
:3 composite recording signal Sm or aspect ratio 16:9
The composite recording signal Sm' for the 4:3 aspect ratio HPF65 corresponds to the FM luminance signal Yf for the aspect ratio 16:3.
HPF67 compatible with 9 FM luminance signal Yf', BPF6 compatible with low frequency conversion color signal Cc for aspect ratio 4:3
9. BPF 71 corresponding to the low frequency conversion color signal Cc' for aspect ratio 16:9, BPF 73 corresponding to the first FM audio signal Af, BP corresponding to the second FM audio signal Af'
F75 and a BP whose passband is a frequency band that includes all of the recording pilot signals P1' to P4'.
Supplied to F77.

When the composite recording signal Sm for an aspect ratio of 4:3 is read from the rotary magnetic heads 55a and 55b, which are used as reproduction rotary magnetic heads, the recording signal Sm, each having a constant phase, is read out from the BPF 77. Pilot signals P1' to P4' are obtained. The recording pilot signals P1' to P4' from the BPF 77 are supplied to the tracking error signal forming section 79, and the recording pilot signals P1' to P4' are supplied to the tracking error signal forming section 79.
Pilot signals P1 to P4 are reproduced based on P4', and a tracking error signal St representing 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 is formed based on them. be done. Then, the tracking error signal S formed in the tracking error signal forming section 79
t is 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.

Further, the recording pilot signals P1' to P4' from the BPF 77 are supplied to a synchronous detection section 83 and a phase locked loop circuit (PLL) 8.
4. In such a case, since each of the recording pilot signals P1' to P4' is assumed to have a constant phase, the PLL 84 outputs a constant phase, respectively, according to the recording pilot signals P1' to P4'. Signals having a phase of , that is, reproduced pilot signals P1 to P4 are obtained and supplied to the synchronous detection section 83. In the synchronous detection section 83, the recording pilot signal P1 from the BPF 77
'~P4' are pilot signals P1~P from PLL84
However, since the recording pilot signals P1' to P4' are in the same phase as the pilot signals P1 to P4, respectively, the synchronous detection unit 83 outputs, for example, a continuously high level detection output. De is obtained and extracted through a low pass filter (LPF) 85.

The detection output De from the LPF 85 that is continuously at a high level is supplied to the discrimination signal forming section 87 . The discrimination signal forming section 87 forms an aspect ratio discrimination signal Da having a low level in accordance with the detection output De which continuously takes a high level, and sends it to the aspect ratio discrimination output terminal 102.
Send to.

In such a case, an FM luminance signal Yf for an aspect ratio of 4:3 is obtained from the HPF 65 and supplied to the selection contact 103a of the switch 103. The switch 103 is supplied with the aspect ratio discrimination signal Da obtained from the discrimination signal forming section 87, and its movable contact 103c is connected to the selection contact 103a in response to the aspect ratio discrimination signal Da that takes a low level. As a result, the aspect ratio from HPF65 is 4:
3 FM luminance signal Yf is supplied to the luminance signal reproduction processing section 99 through the switch 103. The brightness signal reproduction processing section 99 is supplied with the aspect ratio discrimination signal Da obtained from the discrimination signal forming section 87, and depending on the aspect ratio discrimination signal Da that takes a low level, the luminance signal reproduction processing section 99 reproduces the aspect ratio discrimination signal Da for the aspect ratio of 4:3. A state is assumed in which various processes including demodulation processing are performed on the FM luminance signal Yf, and the first luminance signal Y1 based on the FM luminance signal Yf for an aspect ratio of 4:3 is obtained from the luminance signal reproduction processing section 99. is sent to the luminance signal output terminal 105 as a reproduced luminance signal.

[0046] Also, the aspect ratio is 4:3 from BPF69.
The low frequency converted color signal Cc is obtained and the color signal reproduction processing section 10
7. In the color signal reproduction processing section 107,
Various processes including frequency conversion processing are performed on the low frequency conversion color signal Cc for the aspect ratio 4:3, and the color signal reproduction processing unit 107 outputs the low frequency conversion color signal Cc for the aspect ratio 4:3.
A first carrier color signal C1 based on the switch 1 is obtained.
09 selection contact 109a. switch 109
is supplied with the aspect ratio discrimination signal Da obtained from the discrimination signal forming section 87, and the movable contact 1
09c is connected to the selection contact 109a, whereby the first carrier color signal C1 from the color signal reproduction processing section 107 is sent to the color signal output terminal 111 as a reproduced color signal through the switch 109. .

Furthermore, the first FM audio signal Af is obtained from the BPF 73, and the selection contact 113a of the switch 113 is
supplied to The switch 113 is connected to the discrimination signal forming section 87.
The movable contact 113c is set to the selection contact 113 in response to the aspect ratio discrimination signal Da obtained from the low level aspect ratio discrimination signal Da.
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 is supplied with the aspect ratio discrimination signal Da obtained from the discrimination signal forming section 87, and depending on the aspect ratio discrimination signal Da that takes a low level,
The first FM audio signal Af is in a state where various processes including demodulation processing are performed, and the audio signal reproduction processing unit 115 outputs a first audio signal AU based on the first FM audio signal Af.
1 is obtained and sent to the audio signal output terminal 117 as a reproduced audio signal.

On the other hand, when the composite recording signal Sm' for an aspect ratio of 16:9 is read from the rotary magnetic heads 55a and 55b, which are used as reproduction rotary magnetic heads, the BPF7
7, the recording pilot signal P1', which is phase-modulated based on the control signal Sa, has a constant phase every four consecutive field periods in the recording video signal included in the composite recording signal Sm' for an aspect ratio of 16:9. a recording pilot signal P2' having a recording pilot signal P2', a recording pilot signal P3' phase-modulated based on the control signal Sa,
Then, a recording pilot signal P4' having a constant phase is sequentially obtained. The recording pilot signals P1' to P4' from the BPF 77 are supplied to the tracking error signal forming section 79, and the recording pilot signals P1' to P4' are supplied to the tracking error signal forming section 79.
4', pilot signals P1 to P4 are regenerated,
Based on these, a tracking error signal S representing the deviation of the scanning locus of the rotating magnetic heads 55a and 55b on the magnetic tape with respect to the center of each inclined recording track
t is formed. Then, the tracking error signal St formed in the tracking error signal forming section 79
is 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.

The recording pilot signals P1' to P4' from the BPF 77 are supplied to the synchronous detection section 83 and also to the PLL 84. In such a case, each of the recording pilot signals P1' and P3' is set to have a phase angle of 0 and π alternately for a period of 1/2 of the period of the control signal Sa, and the recording pilot signals P1' and P3' are Since each of the signals P2' and P4' is assumed to have a constant phase, when each of the recording pilot signals P1' and P3' is supplied from the PLL 84, for example, the recording pilot signal P1 When each of ' and P3' takes a phase of phase angle 0, it takes a phase of phase angle 0, and when each of recording pilot signals P1' and P3' takes a phase of phase angle π, it also takes a phase of 0. Signals whose phase is maintained, i.e. regenerated pilot signals P1 and P3 with constant phase are obtained, respectively, and
When each of the recording pilot signals P2' and P4' is supplied, reproduced pilot signals P2 and P4 having a constant phase are obtained, respectively.

The reproduced pilot signals P1 to P4 obtained from the PLL 84 are supplied to the synchronous detection section 83, and in the synchronous detection section 83, the recording pilot signals P1' to P4' from the BPF 77 are converted to the pilot signals P1 to P4 from the PLL 84. Each signal is synchronously detected by P4. In such a case, each of the recording pilot signals P1' and P3' is assumed to alternately take a phase of phase angle 0 and π for a period of 1/2 of the period of the control signal Sa, so that the recording pilot signals P1' and P3', respectively, have a phase angle of 0 and π. The phase of P3 is inverted by 1/2 of the period of the control signal Sa every period of the control signal Sa, and each of the recording pilot signals P2' and P4' is It is assumed that it has a phase,
Since they are in the same phase as the pilot signals P2 and P4, the synchronous detection unit 83 outputs high and low levels for each period of 1/2 of the period of the control signal Sa based on the recording pilot signal P1'. A part that takes a high level continuously based on the recording pilot signal P2', and a part that takes a high level and a low level continuously for a period of 1/2 of the period of the control signal Sa based on the recording pilot signal P3'. The part where the level is taken alternately, and the recording pilot signal P
4', a detection output De having a portion that continuously takes a high level is obtained, and is extracted through the LPF 85.

In this way, the detection output De obtained from the LPF 85 continuously rises to a high level every other field period in the recording video signal included in the composite recording signal Sm' for an aspect ratio of 16:9. At the same time, the control signal Sa is supplied to the discrimination signal forming section 87, and is supplied to the discrimination signal forming section 87, and is set to alternately take a high level and a low level for a period of 1/2 of the period of the control signal Sa every other field period. The forming section 87 forms an aspect ratio discrimination signal Da having a high level according to the detection output De, and sends it to the aspect ratio discrimination output terminal 102.

In such a case, an FM luminance signal Yf' for an aspect ratio of 16:9 is obtained from the HPF 67 and supplied to the selection contact 103b of the switch 103. At this time, the switch 103 is brought into a state in which its movable contact 103c is connected to the selection contact 103b in response to the aspect ratio discrimination signal Da that takes a high level, and thereby,
The 16:9 aspect ratio FM luminance signal Yf' from the HPF 67 is supplied to the luminance signal reproduction processing section 99 through the switch 103. The brightness signal reproduction processing unit 99 takes a state in which it performs various processes including demodulation processing on the FM brightness signal Yf' for an aspect ratio of 16:9 in accordance with the aspect ratio discrimination signal Da that takes a high level, and performs the brightness signal reproduction processing. From section 99, FM luminance signal Yf' for aspect ratio 16:9 is output.
A second luminance signal Y2 based on the luminance signal Y2 is obtained and is sent to the luminance signal output terminal 105 as a reproduced luminance signal.

[0053] Also, from BPF71 to aspect ratio 16:
The low frequency converted color signal Cc' for 9 is obtained and supplied to the color signal reproduction processing section 119. In the color signal reproduction processing section 119, various processes including frequency conversion processing are performed on the low frequency conversion color signal Cc' for the aspect ratio 16:9. A second carrier color signal C2 based on the converted color signal Cc' is obtained and supplied to the selection contact 109b of the switch 109. At this time, the switch 109 is brought into a state in which its movable contact 109c is connected to the selection contact 109b in response to the aspect ratio discrimination signal Da which takes a high level, and thereby,
The second carrier color signal C2 from the color signal reproduction processing section 119 is sent to the color signal output terminal 111 as a reproduced color signal through the switch 109.

Furthermore, the second FM audio signal Af' is obtained from the BPF 75, and the selection contact 113 of the switch 113 is
b. At this time, the switch 113 has its movable contact 113c connected to the selection contact 113b in response to the aspect ratio discrimination signal Da which takes a high level, and thereby the second FM audio signal Af' from the BPF 75 is connected to the selection contact 113b. is supplied to the audio signal reproduction processing section 115 through the switch 113. The audio signal reproduction processing unit 115 outputs the second
The audio signal reproduction processing section 115 performs various processing including demodulation processing on the FM audio signal Af'.
Second audio signal AU based on second FM audio signal Af'
2 is obtained and sent to the audio signal output terminal 117 as a reproduced audio signal.

In this way, in the example of the magnetic reproducing apparatus shown in FIG. 6, the rotating magnetic heads 55a and 55b
Based on the amplitude change state of the recording pilot signals P1' to P4' obtained through the BPF 77 from
The aspect ratio determination signal Da that identifies the case where the synthetic recording signal Sm' is read is easily obtained, and based on the aspect ratio determination signal Da, the rotary magnetic head 55a
and 55b to a composite recording signal Sm for an aspect ratio of 4:3.
It is automatically determined whether the composite recording signal Sm' for an aspect ratio of 16:9 is read out, and the video signal reproduction processing is performed appropriately in either case.

[0056]

As is clear from the above description, according to the magnetic recording apparatus according to the present invention, a recording video signal formed based on an input video signal and a pilot signal are frequency multiplexed and combined. When recording the composite recording signal that is included on the magnetic tape using the magnetic head unit, the composite recording signal appropriately obtains a reproduced image screen having a first aspect ratio of, for example, 4:3. For example, when the composite recording signal includes a recording video signal based on a video signal that can be converted to a 16:9 ratio,
The first recording video signal or the second recording video signal may include a second recording video signal based on a video signal that can appropriately obtain a reproduced image screen with an aspect ratio of In addition, the phase change state of the pilot signal recorded on the magnetic tape is 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. As the phase change state of the pilot signal, special information indicating which one of the video signal and the video signal from which the reproduced image screen of the second aspect ratio can be properly obtained is formed based on. Therefore, when the video signal is reproduced, the recorded video signal is determined based on the phase change state of the pilot signal read from the magnetic tape. The image is formed based on a video signal that can appropriately obtain a reproduced image screen with an aspect ratio of 1, or based on a video signal that can appropriately obtain a reproduced image screen with a second aspect ratio. This means that it will be possible to automatically determine whether or not the image was created by someone else.

Further, in the magnetic reproducing apparatus according to the present invention, based on the recording pilot signal in the composite recording signal read from the magnetic tape, the composite recording signal read from the magnetic tape is reproduced with 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; This makes it easy to obtain a discrimination signal for discriminating whether the recording video signal of 2 is included or not.
Based on such a discrimination signal, it is automatically determined whether the composite recording signal read from the magnetic tape includes the first recording video signal or the second recording video signal. In either case, the video signal is properly reproduced.

[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 is a conceptual diagram illustrating a pilot signal transmission state according to the example shown in FIG. 1;

3 is a frequency spectrum diagram illustrating a composite recording signal recorded on a magnetic tape according to the example shown in FIG. 1; FIG.

FIG. 4 is a waveform diagram used to explain the operation of the example shown in FIG. 1;

5 is a frequency spectrum diagram illustrating a composite recording signal recorded on a magnetic tape according to the example shown in FIG. 1; FIG.

FIG. 6 is a block connection diagram showing an example of a magnetic reproducing device according to the present invention.

FIG. 7 is a conceptual diagram illustrating a recording mode of a pilot signal on a magnetic tape.

FIG. 8 is a conceptual diagram for explaining the aspect ratio of a reproduced image screen.

[Explanation of symbols]

11 Video signal input terminal 13 Video signal input terminal 15 Audio signal input terminal 17 Control signal input terminal 19 Luminance signal recording processing section 23 Signal synthesis section 25 Color signal recording processing section 27 Color signal recording processing section 33 Audio signal recording processing section 37 Pilot Signal supply section 39 Oscillation circuit 41 Pilot signal forming section 43 Pulse signal forming section 45 Phase control section 47 Control signal generating section 55a Rotating magnetic head 55b Rotating magnetic head 79 Tracking error signal forming section 81 Tracking servo control section 83 Synchronous detection section 84 PLL 87 Discrimination signal forming section 99 Luminance signal reproduction processing section 107 Color signal reproduction processing section 115 Audio signal reproduction processing section 119 Color signal reproduction processing section

Claims (2)

[Claims] 1. A first recording video signal based on a video signal capable of obtaining a reproduced image screen with a first aspect ratio;
and 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 a second aspect ratio, and a pilot signal whose phase is substantially constant. a pilot signal forming unit that sends out a pilot signal, and a case where the first recording video signal is obtained from the recording video signal forming unit and a case in which the phase change state of the pilot signal obtained from the pilot signal forming unit is obtained from the recording video signal forming unit; a pilot signal phase control unit that performs phase modulation processing to obtain a recording pilot signal so as to be different depending on when the second recording video signal is obtained from the first recording video signal forming unit; or a signal synthesizing means for forming a composite recording signal that includes the second recording video signal and the recording pilot signal obtained from the pilot signal phase control unit by frequency multiplexing, and the composite recording. A magnetic recording device comprising a magnetic head section that records signals on a magnetic tape in a manner in which a plurality of recording tracks are sequentially arranged. 2. A first recording video signal based on a video signal capable of obtaining a reproduced image screen with a first aspect ratio;
Alternatively, a second recording video signal based on a video signal capable of obtaining a reproduced image screen with a second aspect ratio;
A record obtained from a pilot signal phase control unit that performs phase modulation processing on the pilot signal to make the phase change state different depending on the first recording video signal and the second recording video signal. a magnetic head section for reading out the first or second recording video signal and the accompanying recording pilot signal from the magnetic tape on which the recording pilot signal has been recorded; a video signal reproducing section that obtains a reproduced video signal based on the first or second recording video signal; a pilot signal phase detection section that performs phase detection on the recording pilot signal read by the magnetic head section; Based on the detection output signal from the pilot signal phase detection section, the first recording video signal is read out together with the recording pilot signal by the magnetic head section, and the first recording video signal is read out along with the recording pilot signal by the magnetic head section. A magnetic reproducing device comprising: a discrimination signal forming section that forms a discrimination signal for discriminating a state in which a second recording video signal is read.