JP2957398B2 - Image signal recording and playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus for digitally recording an image signal having a wide aspect ratio, and more particularly, to a recording / reproducing apparatus.
The present invention relates to a wide-aspect-ratio, high-resolution digital recording / reproducing apparatus compatible with a conventional television (TV) analog VTR and a conventional TV digital VTR.

[0002]

2. Description of the Related Art Advances in image compression technology have led to the
A digital VTR capable of recording a moving image for a long time on a cassette size similar to that of a system analog VTR is being put to practical use. Many of the digital VTRs that are currently being put to practical use are not compatible with conventional TV-type analog VTRs, and are often digital VTRs of original standards.

[0003] The prior art disclosed in Japanese Patent Application Laid-Open No. 5-207507 is disclosed. In a VTR device for recording and reproducing a normal television signal, a high definition Hi-Vision signal, and the like,
The object of the present invention is to realize a digital recording VTR device compatible with a conventional analog recording VTR or a digital recording normal television signal VTR device which can be shared with a high definition signal analog recording VTR. It has a signal processing unit for digital recording of signals and a signal processing unit for analog recording, and is a digital code or analog modulation coded video signal processed by a signal processing unit on a tape by two heads on a rotating drum. Is selectively recorded and played back.

As described above, the conventional TV system analog VT
In some cases, a magnetic tape recorded in R can be reproduced by a digital VTR, and a magnetic tape recorded in a digital VTR can be reproduced by an analog VTR of a conventional TV system.

At present, a television signal to be recorded by a VTR almost has an aspect ratio of 4: 3 and a scanning line.
This is an image signal of several 525 normal resolutions. However, in the future, high-resolution television signals (high-vision signals) having an aspect ratio of 16: 9 and 1125 scanning lines will become mainstream. Hi-vision digital VTRs, conventional TV digital VTRs, and conventional TV analog VTRs are being developed without compatibility. Conversion of aspect ratio and screen size
Letter boxes for changing and converting the number of scan lines
Are described in the following document. Reference 1: Hiroshi Onishi
"3. Wide TV 3-1 Signal Conversion" Television Studies
Journal Vol 47, No. 7, pp. 949-952 (1993).

[0006] These existing conventional TV analog VTRs
The conventional TV digital VTR, which is compatible with the conventional system, is provided with both a track for analog recording of a signal of the conventional TV system and a track for digital recording of a signal of the conventional TV system on the same magnetic tape. This is realized by recording both. analog·
The same image is recorded on the track and the digital track. When reproducing with an existing conventional TV system analog VTR, the signal of the analog track is reproduced and
When reproducing with a V-system digital VTR, a digital track signal is reproduced.

[0007]

The aspect ratio of 4:
3. A high-vision digital VTR having an aspect ratio of 16: 9 and 1125 scanning lines compatible with both a conventional TV analog VTR having 525 scanning lines and a conventional TV digital VTR. In this case, it is necessary to provide a high-vision digital track while leaving the conventional TV analog track and the conventional TV digital track. Since a high-definition image signal has much more information than an image signal of a conventional TV system, a high-definition digital signal can be obtained while leaving a conventional analog TV track and a conventional digital track on the same recording medium.・ It is difficult to provide trucks. Therefore, it is necessary to reduce the information amount of the high-vision digital track.

An image signal to be recorded on a digital track of the conventional TV system is used to reduce the aspect ratio difference of a newly recorded high-vision image signal .
Since a part is deleted , there is a strong correlation between the Hi-Vision image signal and the image signal of the conventional TV system. By utilizing this correlation, it is possible to reduce the amount of information on the digital Hi-Vision recording track. for that reason,
A digital high-definition image signal is divided into a conventional TV digital signal and an auxiliary digital signal.
When only the system digital signal is reproduced, a conventional TV system image signal can be reproduced. When both the conventional TV system digital signal and the auxiliary digital signal are reproduced, a high-definition image signal can be synthesized. By using this method, only a new track for recording an auxiliary digital signal needs to be prepared, so that the medium area required for realizing a high-definition digital VTR becomes very small.

However, in order to realize a compatible VTR intended by the present invention, there are already a conventional TV system analog track and a conventional TV system digital track, and in order to maintain compatibility with the conventional TV system VTR. In such a case, the auxiliary digital signal must be recorded in an area where there is no problem when reproduced by a conventional TV VTR, but such an area is difficult to find. Therefore, the conventional TV analog VTR,
There is a problem to be solved in that a high-vision digital VTR that maintains compatibility with a V-system digital VTR cannot be realized.

[0010]

Means for Solving the Problems The VTR of the present invention, Ass
Both a conventional TV system analog image signal and a high vision system digital image signal having different aspect ratios are recorded on the same medium. Since the analog image signal and the digital image signal record the same image, the Hi-Vision signal must be converted into a conventional TV system and recorded on an analog track.

As a method of converting a horizontally long HDTV signal into an image signal of a conventional TV system, a part of a screen is deleted.
By adding black areas above and below, the image is converted to an image that is longer than the HDTV image , and the difference in aspect ratio is reduced.
Close that, there is a so-called letter-box type conversion. Since these upper and lower areas have no meaning for analog images, auxiliary areas for HDTV images (differences)
Minute) Digital signals were recorded. This makes it possible to realize a high-vision digital VTR that is compatible with the conventional TV analog VTR and the conventional TV digital VTR.

[0012]

When a tape recorded by using a digital VTR according to the present invention is reproduced by a conventional TV system analog VTR, an analog recording track is reproduced.
A reproduced image of the letter box type (Reference 1) can be obtained without any problem. In addition, the conventional TV system digital V
In the case of reproduction by the TR, a digital image signal of the conventional TV system can be obtained by reproducing the digital recording track. When reproduced using the digital VTR of the present invention, in addition to the signal from the conventional TV system digital track, the signal is recorded in the areas corresponding to the upper and lower areas of the letter box disposed at both ends of the analog track. Image signal difference between a high-definition HDTV and a conventional TV
By using the part as an auxiliary digital signal , it becomes possible to reproduce a high definition digital high vision signal.

[0013]

FIG. 1 is a block diagram showing a VTR (video tape) according to the present invention.
FIG. 3 is a circuit configuration diagram of one embodiment applied to a (recorder). In FIG. 1, 1 is an analog high-vision image signal input terminal, 2 is a digital high-vision image signal input terminal, 3 is an analog high-vision image signal output terminal, 4
Is a digital high-vision image signal output terminal, 11 is an A / D conversion circuit, 12 is a D / A conversion circuit, 21 is an input image signal switching circuit, 31 is a letter box circuit, 32
Is an analog recording modulation circuit, 33 is a digital recording modulation circuit for a difference signal, 34 is a screen division circuit, 35 is a digital recording modulation circuit, 36 is a difference digital signal, 37 is a recording-modulated difference digital signal, and 38 is a conventional TV system. Digital image signal, 41 is an analog recording / reproducing head, 4
2 is a digital recording / reproducing head, 51 is a magnetic tape, 6
1 is an analog demodulation circuit, 62 is a differential signal demodulation circuit, 6
3 is a screen synthesis circuit, and 64 is a digital demodulation circuit.

In this embodiment, an analog high-vision image signal or a digital high-vision image signal is converted to a conventional TV system analog VTR or a conventional TV system digital VT.
This is a VTR that records and reproduces data in a format that can be reproduced using any of the R and high-vision digital VTRs.

The analog HDTV image signal input from the analog HDTV image signal input terminal 1 is
The input image signal switching circuit 21 selects either the signal converted into a digital high-vision image signal by the / D conversion circuit 11 or the digital high-vision image signal input from the digital high-vision image signal input terminal 2. The selected signal is converted to a conventional TV letter box signal by a letter boxing circuit 31, recorded and modulated by an analog recording modulation circuit 32 in the same format as that of the existing conventional TV analog VTR, and analog recorded. Helical and magnetic tape 51 from the head 41
Record on track. The azimuth of the analog recording head 41 is a conventional TV analog VT of one of a VHS system, an S-VHS system, an 8 mm system, and a Hi-8 system.
It is the same as R.

On the other hand, the input signal is divided into two signals in the screen dividing circuit 34. One is a conventional TV system digital image signal 38, and the other is a difference digital signal 36 between the digital Hi-Vision image signal and the conventional TV system digital image signal. From a digital high definition image signal to a conventional TV digital image signal 38
The method of converting to Hi-Vision image signal is letter /
A boxing method, a method of extracting the center of the screen of a high-definition image signal and converting it to a 4: 3 aspect ratio,
A method of shrinking a high-definition image signal in the horizontal direction.
There are various methods such as a method of using a digital image signal. The screen division circuit 34 may employ any of these methods. When a letter box is used, one circuit can be used as the letter box forming circuit 31 and the screen dividing circuit 34.

FIG. 2 shows an example of a method of dividing a digital high-definition image signal into a conventional TV system digital image signal 38 and a difference digital signal 36 in the screen dividing circuit 34. Here, reference numeral 301 denotes a high-definition image having an aspect ratio of 16: 9, 302 denotes an image obtained by deleting the left and right ends of the high-definition image 301 to be converted to an aspect ratio of 4: 3, and 303 denotes left and right ends of the remaining deleted left and right edges. Reference numeral 304 denotes an image of the conventional TV system in which pixels are thinned out from the image 302 after the left and right edges have been deleted and converted into the conventional TV system, and 305 denotes an image of the thinned pixels. The aspect ratio 16 input to the screen division circuit 34 of FIG.
9, the left and right edges of the screen are cut first, and the image 3 with the aspect ratio of 4: 3 after the left and right edges are deleted
02. Further, scanning line thinning and pixel thinning are performed so that the resolution becomes the same as that of the conventional TV system image, and the image is converted into the conventional TV system image 304. In this conversion, by performing filter processing, it is also possible to prevent aliasing of a wide-range component. When the filtering process is performed, the image 304 of the conventional TV system and the aspect ratio 4:
The difference between the images 302 after the left and right ends of the image No. 3 is changed to an image 305 using the thinned pixels. This conventional TV image 30
4 is a digital image of the conventional TV system.
Recorded on the track. The left and right end images 303 and the image 305 by the thinned pixels are the difference digital signal 36.
Is recorded in the upper and lower areas of the letter box of the analog track. The image 304 of the conventional TV system must record all image information, but the image 305 with the thinned pixels can be estimated from the image 304 of the conventional TV system, and thus can be recorded with a smaller amount of information. .

The conventional TV system digital image signal 38 representing the conventional TV system image 304 created as a result of such image division is subjected to digital image compression, error correction code addition, recording code modulation by the digital recording modulation circuit 35. The digital recording modulation process is performed, and the digital recording / reproducing head 42 records the data on a helical track of the magnetic tape 51. The azimuth of the digital recording / reproducing head 42 is different from that of the analog recording / reproducing head 41,
Reduce cross talk with analog head.

The difference digital signal 36 representing the image 303 at the left and right ends and the image 305 with the thinned pixels is
The digital recording / modulating circuit for differential signal 33 performs digital image compression, error correction code addition, recording code modulation, etc., converts the differential digital signal 36 to analog, and adds a synchronization signal to the image signal in the analog recording / modulating circuit 32. The analog recording / modulation circuit 32 time-division multiplexes and modulates the recording data with the analog image signal of the conventional TV system applied from the letter box circuit 31 and records the data on the helical track of the magnetic tape 51 by the analog recording / reproducing head 41. I do. This recording-modulated differential digital signal 37
It is necessary to prevent the signal below the pedestal level from being generated during the recording so that the record-modulated differential digital signal 37 does not interfere with the synchronization detection operation of the conventional TV analog VTR. In addition, when the recorded and modulated difference digital signal 37 is reproduced by a conventional TV system analog VTR, the signal band is adjusted so that an inconspicuous image such as black is reproduced. By modulating the signal into a signal having an analog synchronizing signal that is continuous with the analog image signal, it is easy to pull in the synchronizing signal when the signal is reproduced by a conventional TV analog VTR.

FIG. 3 shows an example of the track pattern of the magnetic tape recorded as described above. In the figure, 51 is a magnetic tape, 101 to 103 are tracks for recording analog signals (AT), 111 to 116 are recording tracks (DT) for digital signals, 121 to 126 are recording areas for differential digital signals, and 151 and 152 are conventional TV systems. Analog VT
This is the reproduction range of the reproduction head when reproducing with R.

In this example, the reproducing range (151 or 1) of the reproducing head when reproducing with a conventional TV system analog VTR is described.
52), analog tracks 101 to 103 are arranged at the center, and two tracks for digital signal recording are arranged on both sides thereof.
This is an example in which books are arranged one by one. That is, three tracks are arranged in the width of one track of the conventional TV analog VTR. This embodiment is an example in which a large area for a track for recording a digital signal is secured and the image quality of digital recording is prioritized. If an attempt is made to record a digital image signal in a non-compressed state, a larger amount of information must be recorded than in the case of analog recording, so that more tracks are required as in this example. When performing such recording, the number of digital recording / reproducing heads 42 is doubled with respect to the number of analog recording / reproducing heads 41,
At the same time, two digital signal recording tracks sandwiching the analog signal recording track are recorded.

The magnetic tape 51 shown in FIG.
In the case of reproducing with R, the digital recording / reproducing head 42
More digital signal recording tracks (DT) 111-1
16 is read out, restored to a conventional TV system digital image signal by a digital demodulation circuit 64, and furthermore, data of differential digital signal recording areas 121 to 126 are read out from an analog recording / reproducing head 41, and an analog demodulation circuit 61 and a differential signal By restoring the difference digital signal by the demodulation circuit 62 and synthesizing the two by the screen synthesizing circuit 63, it is possible to reproduce the digital high-definition image signal. This signal is output directly from the digital high-vision image signal output terminal 4 or converted into an analog image signal by the D / A conversion circuit 12 and output from the analog high-vision image signal output terminal 3.

When the magnetic tape 51 shown in FIG. 3 is reproduced by a conventional TV system digital VTR, the reproduction head of the digital VTR uses a digital signal recording track (DT) 11.
Reproduce 1-116. The digital signal recording tracks (DT) 111 to 116 are recorded with conventional TV system digital image signals, so that they can be reproduced without any problem.

This tape is used as a conventional TV analog VTR.
In the case of reproduction by the analog VTR,
The areas indicated by the reproduction ranges 151 and 152 on the analog VTR are reproduced. At this time, the digital signal recording tracks (DT) 111 to 116 are simultaneously reproduced.
Since the analog head and azimuth are different,
The disturbance to the head is slight. Therefore, the information of the analog signal recording tracks (AT) 101 to 103 can be reproduced favorably.

FIG. 4 shows an example of a reproduced image when the magnetic tape 51 shown in FIG. 4 is reproduced by a conventional TV system analog VTR. The central analog signal section 201 is a signal reproduced from the analog signal recording tracks (AT) 101 to 103 in FIG. In FIG. 4, the difference signal sections 202 and 203 indicated by oblique lines reproduce the signals of the difference digital signal recording areas 121 to 126 in FIG. The signals in the difference digital signal recording areas 121 to 126 are also recorded in the analog VTR.
Is reproduced so that an inconspicuous image such as black is reproduced when reproduced in the same manner, so that there is no difference from the conventional letter box type reproduced image of the TV system. As described above, even when the video signal is reproduced by the conventional TV analog VTR,
It can be played without any problems. Some conventional TV receivers have a function of deleting the upper and lower edges of the screen. Therefore, if such a receiver is used, the difference signal units 202 and 203 may be black or the like. There is no need to perform modulation so that an inconspicuous image is reproduced, and the band limitation is relaxed, so that more information can be recorded.

FIG. 5 shows another example of the track pattern of the porcelain tape recorded by the VTR of this embodiment.
1,101-103,111-113,121-12
Areas 6, 151 and 152 have functions equivalent to the corresponding numbers and symbols in FIG. This example is a conventional TV
In this example, one track for digital signal recording and one track for analog signal recording are arranged in the width of one track of the analog VTR, and each track width is wider than that in FIG. When a digital image signal is recorded after being compressed with high efficiency, recording can be performed with the same number of tracks as analog recording, and such a configuration is also possible. In this case, analog signal recording tracks (AT) 101 to 10
3 is 1.5 times wider than that of FIG.
When the signal is reproduced by the analog VTR, the S / N ratio is improved, and a higher quality analog reproduced image can be obtained.

FIG. 6 is a circuit diagram showing another embodiment in which the present invention is applied to a VTR.
Reference numerals 31 to 38, 41 to 42, 51, and 61 to 64 have functions equivalent to the corresponding numbers and symbols in FIG. 1, and 43 is a differential signal recording / reproducing head. However, the digital recording modulation circuit 33 for the difference signal is the analog recording modulation circuit 32
It also has the function of In order to record the record-modulated differential digital signal 37, a differential signal recording / reproducing head 43 is newly provided, the analog signal processing section and the digital signal processing section are separated, and the analog recording / modulating circuit 32 and the analog recording / reproducing head 41 are separated. Does not record the difference digital signal 36 from the difference signal digital recording modulation circuit 33 by time division multiplexing, but records the difference digital signal 36 by the difference signal recording / reproducing head 43 and Is an example in which the analog signal recorded on the differential signal recording / reproducing head 43 is reproduced without being reproduced from the analog recording / reproducing head 41. With this configuration, the analog signal processing unit and the digital signal processing unit can be separated, so that digital noise mixed into the analog signal processing unit is reduced and higher quality analog recording can be performed. Becomes possible. Also in this example, since the analog signal recording section and the differential signal recording section on the magnetic tape 51 need to be on the same track, the analog recording / reproducing head 41 (not reproduced in FIG. 6) and the differential signal recording / reproducing head 43 The same track is scanned, and an analog recording area (101 to 10 in FIGS. 3 and 5) is scanned.
In 3), the analog recording head 41 performs recording, and in the differential signal recording area (121 to 126 in FIGS. 3 and 5), the differential signal recording / reproducing head 43 performs recording.

FIG. 7 is a circuit diagram of still another embodiment applied to the VTR of the present invention.
Reference numerals 21, 31, 32, 35, 41, 51, and 64 have functions equivalent to the corresponding reference numerals in FIG.

FIG. 8 shows an example of a track pattern of a magnetic tape recorded by the VTR of the embodiment shown in FIG.
Reference numerals 1, 101 to 103, 151, and 152 denote areas having functions equivalent to the corresponding reference numerals in FIG.
136 are digital signal recording areas. In the examples of FIGS. 7 and 8, the tracks for digital recording in the conventional TV system (111 to 116 in FIG. 3) are not provided independently.
A case where an area for recording a digital signal is provided at 126 is shown. In this embodiment, since the widths of the analog signal recording tracks (AT) 101 to 103 are the same as in the case of the conventional TV system analog VTR, higher quality reproduction is possible when the conventional TV system analog VTR is used for reproduction. Becomes However, since the area for recording the digital signal is much smaller than that in the example of FIG. 3, it is necessary to perform a more efficient compression in the digital recording modulation circuit 35.

[0030]

According to the present invention, the difference in the aspect ratio is adjusted to
A digital VTR according to the present invention in which auxiliary digital signals for a high-definition image are recorded in upper and lower black regions generated when a box-type reproduced image (Document 1) is obtained.
When a tape recorded by using the conventional method is reproduced by an analog VTR of the conventional TV system, a reproduced image of a letter box type can be obtained without any problem by reproducing the analog recording track. Further, in the case of reproduction by a conventional TV digital VTR, a conventional TV system digital image signal can be obtained by reproducing a digital recording track. Digital V of the present invention
In the case of reproduction using a TR, in addition to the signal from the digital track of the conventional TV system, the difference from the digital Hi-Vision signals arranged at both ends of the analog track is obtained.
The use of the auxiliary digital signal indicating the minute makes it possible to reproduce a high-resolution digital high-vision signal. Therefore, the effect of the present invention is extremely large.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of an embodiment of the present invention.

FIG. 2 is an image division diagram showing a principle of dividing an image of a digital Hi-Vision signal used in the present invention.

FIG. 3 shows tracks of a magnetic tape used in the present invention.
FIG. 3 is a track pattern diagram showing an embodiment of a pattern.

FIG. 4 shows a conventional TV system analog VTR using the tape of FIG. 3;
FIG. 9 is an image diagram showing a reproduced image when reproduced in FIG.

FIG. 5 shows tracks of a magnetic tape used in the present invention.
FIG. 10 is a track pattern diagram showing another embodiment of the pattern.

FIG. 6 is a circuit configuration diagram of another embodiment of the present invention.

FIG. 7 is a circuit configuration diagram of still another embodiment of the present invention.

8 is a track pattern diagram showing one embodiment of a track pattern recorded on a magnetic tape with the circuit configuration of FIG. 7;

[Explanation of symbols]

REFERENCE SIGNS LIST 1 analog / high-vision image signal input terminal 2 digital / high-vision image signal input terminal 3 analog / high-vision image signal output terminal 4 digital / high-vision image signal output terminal 11 A / D conversion circuit 12 D / A conversion circuit 21 input image signal switching circuit Reference Signs List 31 letter boxing circuit 32 analog recording / modulating circuit 33 digital recording / modulating circuit for differential signal 34 screen division circuit 35 digital recording / modulating circuit 36 differential digital signal 37 recorded / modulated differential digital signal 38 conventional TV digital image signal 41 analog recording Reproduction head 42 Digital recording / reproduction head 43 Difference signal recording / reproduction head 51 Magnetic tape 61 Analog demodulation circuit 62 Difference signal demodulation circuit 63 Screen synthesis circuit 64 Digital demodulation circuit 101-103 Log signal recording track (AT) 111 to 116 digital signal recording track (D
T) 121 to 126 Difference digital signal recording area 131 to 136 Digital signal recording area 151, 152 Reproduction range in analog VTR 201 Analog signal section 202, 203 Difference signal section 301 Hi-vision image 302 Image after left and right edge reduction 303 Left and right edge Image 304 Image of conventional TV system 305 Image by thinned pixels

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hironori Akasaka 4-36-19 Yoyogi, Shibuya-ku, Tokyo Inside Graphics Communication Laboratories Co., Ltd. (72) Toshifumi Sakaguchi 4-chome, Yoyogi, Shibuya-ku, Tokyo 36-19, Co., Ltd. Graphics Communication Laboratories (72) Inventor Tomoyuki Shindo 4-36-19, Yoyogi, Shibuya-ku, Tokyo Co., Ltd. Graphics Communication Laboratories Co., Ltd. (72) Inventor Wataya Yuzumi 4-36-19 Yoyogi, Shibuya-ku, Tokyo Graphics Communication Laboratories Inc. (56) References JP-A-4-88773 (JP, A) (58) Fields surveyed (Int.Cl) . ^6, DB name) H04N 5/92 G11B 20/00

Claims (11)

(57) [Claims] A digital image signal and an analog image signal which are input from one of an input digital image signal and an analog image signal having different aspect ratios.
In order to make the difference between the two aspect ratios of the image signal closer , at least a part of the displayed screen is deleted and the resolution is low.
A screen conversion means (31) for obtaining an image signal after screen conversion into a screen; and
Obtained by dividing the screen by pulling and changing the aspect ratio
A digital image signal after the screen division (38), the input image signal and the digital image signal after the screen division (3
8) A difference digital signal (36) representing the difference screen
Screen division means (34) for obtaining a difference digital signal (36), and a difference signal digital recording / modulation means (33) for recording and modulating the difference digital signal (36) to obtain a record-modulated difference digital signal (37). Digital recording modulation means (35) for recording and modulating the digital image signal (38) after the screen division to obtain a digital recording modulation signal; and the image signal after the screen conversion and the recording modulated differential digital signal. Analog recording modulation means (32) for performing analog recording modulation on the signal (37) at predetermined time intervals to obtain an analog recording modulation signal; and recording the image signal of the analog recording modulation signal after the screen conversion. The signal is recorded on the analog signal recording tracks (101 to 103) on the medium (51), and the recording-modulated difference of the analog recording modulation signal is recorded. The minute digital signal (37) is transferred to the analog signal recording track (101 to 101).
Analog recording means (41) for recording in a difference digital signal recording area (121 to 126) provided in a part of the digital signal recording section (103), and the digital recording modulation signal to a digital signal recording track (111 to 116). An image signal recording / reproducing apparatus including digital recording means (42) for recording. 2. A beauty analog Oyo While the digital image signal from an input image signal of one of the input aspect ratio different daisy <br/> barrel image signal and an analog image signal
In order to make the difference between the two aspect ratios of the image signal closer , at least a part of the displayed screen is deleted and the resolution is low.
The image signal after the screen conversion to the screen and the screen represented by the input image signal are subjected to scanning line thinning, pixel thinning, and ashing.
The difference between the input image signal and the divided digital image signal (38) obtained by dividing the screen by changing the spectrum ratio, and the input image signal.
Screen conversion / division means (31, 34) for obtaining a differential digital signal (36) representing a plane; and recording and modulating the differential digital signal (36) to obtain a record-modulated differential digital signal (37). a digital recording modulation means for differential signal (33), a digital recording modulation means for the digital image signal after the screen split (38) recording the modulated obtain recording modulation signal of the digital to (35), said screen transformation An analog recording modulation means (32) for obtaining an analog recording modulation signal by performing analog recording modulation of a subsequent image signal and the recording-modulated differential digital signal (37) at predetermined time intervals; The image signal after the screen conversion is recorded on the analog signal recording tracks (101 to 103) on the recording medium (51). The recording-modulated differential digital signal (37) of the analog recording modulation signal is transferred to the analog signal recording track (101 to 101).
Analog recording means (41) for recording in a difference digital signal recording area (121 to 126) provided in a part of the digital signal recording section (103), and the digital recording modulation signal to a digital signal recording track (111 to 116). An image signal recording / reproducing apparatus including digital recording means (42) for recording. 3. A digital image signal and an analog signal from one of an input digital image signal and an analog image signal having different aspect ratios.
In order to make the difference between the two aspect ratios of the image signal closer , at least a part of the displayed screen is deleted and the resolution is low.
A screen conversion means (31) for obtaining an image signal after screen conversion to a screen; an analog recording modulation means (32) for obtaining an analog recording modulation signal from the image signal after screen conversion ; The screen represented by the input image signal is thinned by scanning lines,
Obtained by dividing the screen by pulling and changing the aspect ratio
A digital image signal after the screen division (38), the input image signal and the digital image signal after the screen division (3
8) A difference digital signal (36) representing the difference screen
Screen division means (34) for obtaining a difference digital signal (36), and a difference signal digital recording / modulation means (33) for recording and modulating the difference digital signal (36) to obtain a record-modulated difference digital signal (37). Digital recording modulation means (35) for recording and modulating the digital image signal (38) after the screen division to obtain a digital recording modulation signal; and converting the analog recording modulation signal to an analog signal on a recording medium (51). An analog signal recording means (41) for recording on a recording track (101 to 103); and a differential digital signal provided on a part of the analog signal recording track by recording the modulated digital signal (37). A difference signal recording means (43) for recording in a recording area (121 to 126); and a digital image after the image information amount is reduced. No. (38) an image signal recording and reproducing apparatus including a digital recording means for recording the digital signal recording track (111 to 116) (42) a. 4. A digital image signal and an analog signal from one of an input digital image signal and an analog image signal having different aspect ratios.
In order to make the difference between the two aspect ratios of the image signal closer , at least a part of the displayed screen is deleted and the resolution is low.
The image signal after the screen conversion to the screen and the screen represented by the input image signal are subjected to scanning line thinning, pixel thinning, and ashing.
And the aspect ratio of the screen divided screen obtained after dividing the digital image signal by changing (38) the difference digital signal representative of the screen of the difference between the digital image signal and the digital image signal after the screen division (38) ( a screen conversion dividing means for obtaining a 36) (31, 34), an analog recording modulation means for obtaining an analog recording modulation signal (32) from the image signal after the screen transformation, the difference digital signal (36) Digital signal modulation / modulation means (33) for obtaining a differential digital signal (37) modulated by recording modulation, and a digital image signal (38) after the screen division is modulated and digitally recorded. Digital recording modulation means (35) for obtaining a modulation signal; and an analog recording modulation signal for recording an analog signal on a recording medium (51). An analog signal recording means (41) for recording on a track (101-103); and a differential digital signal recording area provided on a part of the analog signal recording track for recording the modulated digital signal (37). Differential signal recording means (43) for recording the digital image signal (38) on the digital signal recording tracks (111-116); An image signal recording / reproducing apparatus including a reproducing means (42). 5. A digital image signal and an analog image signal from one of an input digital image signal and an analog image signal having different aspect ratios.
In order to make the difference between the two aspect ratios of the image signal closer , at least a part of the displayed screen is deleted and the resolution is low.
A screen conversion means (31) for obtaining an image signal after screen conversion to a screen; and a digital recording modulation means (35) for recording and modulating the input image signal to obtain a digital recording modulation signal. Analog recording modulation means (3) for obtaining an analog recording modulation signal by performing analog recording modulation on the image signal after the screen conversion and the digital recording modulation signal at predetermined time intervals.
2), and recording the image signal after the screen conversion of the analog recording modulation signal on the analog signal recording tracks (101 to 103) on the recording medium (51); Digital recording modulation signals (131-136) provided in a part of the analog signal recording tracks (101-103).
An image signal recording / reproducing apparatus including an analog recording means (41) for recording in an image signal. 6. The analog signal recording track (10).
1 to 103) are in the reproduction range (15
6. The image signal recording / reproducing apparatus according to claim 1, wherein the image signal recording / reproducing apparatus is substantially along a line indicating the center of (1, 152). 7. The analog signal recording track (10)
6. An image signal recording / reproducing apparatus according to claim 1, wherein a letter-box type image signal is obtained when the signal reproduced from (1) to (103) is analog-demodulated. 8. The track (10) for recording an analog signal.
1 to 103), the track spacing between the azimuth and the analog signal recording tracks (101 to 103) is one of the conventional systems including the conventional VHS, S-VHS, 8 mm, and Hi-8 systems. 6. The image signal recording / reproducing apparatus according to claim 1, wherein the image signal recording / reproducing apparatus conforms to the following. 9. The analog signal recording track (10)
1 to 103) and the digital signal recording track (1).
5. The image signal recording / reproducing apparatus according to claim 1, wherein the azimuths of the image signals are different from each other. 10. An image signal recording / reproducing apparatus comprising: an analog reproduction signal reproduced from the analog signal recording track (101-103); and a differential reproduction reproduced from the differential digital signal recording area (121-126). Analog demodulation means (61) for demodulating a signal
A differential signal demodulating means (62) for demodulating the differential reproduced signal to obtain a differential digital reproduced signal; and a digital signal recording track (111-116).
The image from the recording modulation signal of the digital reproduced from
Demodulates the digital image signal (38) after plane division and screens
Digital demodulation means for obtaining a digital demodulated image signal after the division (64), said differential digital reproduction signal and a screen for outputting by synthesizing the input image signal and a digital demodulated image signal after the screen division 2. Combining means (63).
To 4 image signal recording and reproducing devices. 11. A digital demodulation means for demodulating the digital recording modulation signal reproduced from the digital signal recording areas (131 to 136) to obtain the input image signal. 6
6. The image signal recording / reproducing apparatus according to claim 5, which further comprises the following step 4).