JP2959329B2 - Video signal recording method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal recording method.

[0002]

2. Description of the Related Art As a magnetic recording / reproducing apparatus for recording / reproducing a high-definition video signal having a wider number of scanning lines and a wider bandwidth than a conventional video signal, a so-called UNIHI type high definition VTR is used.
It has been known. In such a VTR, a color difference signal is line-sequentially converted, then a signal obtained by compressing the color difference signal on the time axis and a signal obtained by compressing the luminance signal on the time axis are time-division multiplexed and TCI
A signal was generated, and the TCI signal was recorded and reproduced.

[0003] was because in this way for the color difference signals according to the high definition video signal and line sequential recording a large number of scanning lines, less image degradation even thinning the color difference signal for each line.

[0004]

However, a VT capable of recording and reproducing not only a high definition video signal but also a conventional video signal.
When R is assumed, there is a problem in that when a color difference signal relating to a conventional video signal is line-sequentially recorded, the number of scanning lines is small, so that the image quality is significantly deteriorated.

Therefore, an object of the present invention is to solve such a problem.

[0006]

SUMMARY OF THE INVENTION The present invention provides the following structure to solve the above problems.

A video signal recording method for recording a conventional video signal and a high-definition video signal having a larger number of scanning lines than this signal. When the first color difference signal and the luminance signal are time-axis-compressed for each line, these signals are time-division multiplexed and recorded for each line, and the high-definition video signal is recorded. One of the first and second line-sequential color signals obtained by thinning out the first and second color difference signals related to the high-definition video signal line by line, and the luminance signal for each line, respectively. Axial compression, time-division multiplexing of these signals line by line, and recording
When recording the conventional video signal, the high-definition
A video signal recording method, wherein a part of a memory area used for recording a signal is also used .

A conventional video signal and a signal having a larger number of scanning lines than this signal are used.
Video signal recording method for recording high definition video signals.
Therefore, when recording the conventional video signal,
1 line for the first and second color difference signals and the luminance signal
The time axis is compressed each time, and these signals are
When recording by dividing and multiplexing and recording the high-definition video signal
Includes first and second color difference signals related to the high-definition video signal.
Of the first and second line-sequential color signals obtained by thinning
Time axis compression of one signal and luminance signal for each line
These signals are time-division multiplexed for each line and recorded.
The ratio of the time axis compression ratio of the color difference signal to the time axis compression ratio of the luminance signal when recording the conventional video signal is compared with the ratio when recording the high definition video signal. A video signal recording method characterized by being large.

[0009]

FIG. 1 is a block diagram for explaining a video signal recording apparatus according to an embodiment of the present invention, FIG. 2 is a timing chart of FIG. 1, and FIG. 3 is a view for explaining one mode of line sequential processing. FIG. 4 is a conceptual diagram for explaining another aspect of the line sequential processing, FIG. 5 is a conceptual diagram for explaining division of a high-definition video signal, and FIG. 6 is a diagram for explaining recording processing means. 7, FIG. 7 is a waveform diagram of a TCI signal, FIG. 8 is a plan view of a rotating drum, FIG. 9 is a conceptual diagram for explaining a magnetic tape pattern, and FIG. 10 is a video signal reproduction according to one embodiment of the present invention. FIG. 11 is a block diagram for explaining the reproduction processing means, and FIG. 12 is a block diagram for explaining the reproduction processing means according to another aspect of the line sequential processing. FIG. 13 is a conceptual diagram for explaining an arithmetic circuit in another mode of line sequential processing. Hereinafter, a description will be given of an embodiment with reference to the drawings, in which a high-definition signal (hereinafter, abbreviated as “HD signal”) will be described as an example of a high-definition video signal.

First, the video signal recording apparatus will be described. This video signal recording apparatus records an HD signal and an NTSC video signal corresponding to a conventional video signal.
The recording mode includes a time-division multiplexing of a signal obtained by line-sequentially performing a color difference signal relating to an HD signal and a signal obtained by compressing a time axis of a luminance signal relating to an HD signal and a signal obtained by dividing the signal into two. 1, a first recording mode in which a second recording TCI signal and an audio signal are simultaneously recorded on three tracks respectively, a signal obtained by compressing a color difference signal related to a conventional video signal on a time axis, and a conventional video signal. A second recording mode in which a recording TCI signal obtained by time-division multiplexing a signal obtained by time-sharing a luminance signal with a signal is recorded on one track in a recording time three times as long as the first recording mode; A recording TCI signal obtained by time-division multiplexing a signal obtained by time-division multiplexing a signal into two programs, a third recording mode for recording each of the two tracks in the same recording time as the first recording mode, and a conventional video signal FM Modulate to one track There is a fourth recording mode for recording. The first to third recording modes record on a high-performance recording medium such as a metal tape or a vapor-deposited tape, while the fourth recording mode records on a conventional recording medium such as an iron oxide tape.

In FIG. 1, a Y signal (luminance signal) and a PB, PR signal (color difference signal) are supplied to a selecting means 1 from a transmission line (not shown). Here, the Y, PB, and PR signals are signals compliant with the domestic Hi-Vision signal standard, and are signals converted from the R, G, and B signals by the following equations.

Y = 0.7154G + 0.0721B + 0.2125R PB = 0.5389 (-0.7154G + 0.9279B-0.2125R) PR = 0.6349 (-0.7154G-0.0721B + 0.7875R) Also, the first program is transmitted from a transmission line (not shown). The first
Of the conventional video signal aa is supplied to the first decoder 2, where the luminance signal Ya and the first and second color difference signals (RY) a and (BY) a obtained by well-known demodulation are supplied to the selection means 1. Supply.

The selecting means 1 selectively outputs the signals Y, PB and PR in the first recording mode, and outputs the signals Ya and (RY) in the second and third recording modes. ) a, (BY)
a is selectively output, and these signals are supplied to the recording processing means 8 via the A / D converters 3 to 5.

Further, a second conventional video signal bb relating to the second program is supplied to the selecting means 6 from a transmission line (not shown). This selecting means 6 is used for the second recording mode in the third recording mode.
Of the conventional video signal bb is supplied to the second decoder 7, while in the fourth recording mode, the second conventional video signal bb is
Is supplied to the conventional recording means 13.

The second decoder 7 shows a luminance signal Yb and first and second chrominance signals (RY) b and (BY) b which have been subjected to well-known demodulation in the same manner as the first decoder 2. The data is supplied to the recording processing means 8 via an A / D converter.

As described above, the recording processing means 8 includes the first
Signals Y, PB and PR are supplied in the recording mode of
The signals Ya, (RY) a, and (BY) a are supplied in the recording mode, and the signals Ya, (RY) a, (BY) a and Yb, (RY) b, (BY) b is supplied.

Here, the operation of the recording processing means 8 will be described with reference to FIG. The numbers in the figure represent the order of the lines of the signal supplied to the recording processing means 8. First,
In the first recording mode, the signals Y, PB, and PR shown in FIGS. 7A to 7C are supplied, and the signals PB and PR are line-sequentially converted, and then the time-axis-compressed signal and the signal Y are converted. Are time-division multiplexed and divided into two to generate first and second recording TCI signals 8a and 8b shown in FIGS. The ratio between the time-axis-compressed line-sequential color signal period P and the time-axis-compressed luminance signal period Q constituting the first and second recording TCI signals 8a and 8b is set to 1: 3. I have. In this line-sequential conversion method, as shown in FIG. 3, the signals PB,
A method of selecting a PR and a method of alternately taking out each color component for each sample over two lines as shown in FIG. 4 and using the signal PB or the signal PR shown by a dotted line in FIG. There is.

Further, the video signal recording apparatus according to this embodiment shares the servo system and maintains the H arrangement.
Since it has the same drum diameter and tape running speed as a conventional video signal recording device (for example, VHS system, 8 mm system), the number of lines that can be recorded on one track on the tape pattern depends on the conventional video signal recording. It is 262.5 lines consistent with that of the device. On the other hand, the number of lines of the HD signal is 562.5 lines / field, and even if it is divided into two, it exceeds 262.5 lines. Therefore, when converting to a recording TCI signal, upper and lower lines of the screen including the vertical synchronization signal are deleted, a new synchronization signal is added, and only a predetermined line is converted. This operation will be described with reference to FIG. In the figure, signals Y and P shown in the upper left
B, PR (HDTV signal), a signal corresponding to the number of effective scanning lines (1032 lines) of the MUSE signal from which the lines on the upper and lower sides of the screen are deleted is generated, and this signal is converted to the lower left and right in FIG. The signal is divided into two signals shown below.

Next, in the second recording mode, FIG.
Signals Ya, (RY) a, and (BY) a shown in (F) to (H) are supplied, and a signal obtained by compressing the signals (RY) a and (BY) a on the time axis and a signal Y on the time axis are compressed. The resulting signal is time-division multiplexed to generate a first recording TCI signal 8a shown in FIG. Then, a period X related to the time-axis-compressed signal (RY) a, a period Y related to the time-axis-compressed signal (BY) a, and the time-axis-compressed signal Ya constituting the first recording TCI signal 8a. Is set to 1: 1: 6.

Further, in the third recording mode, the first recording TCI signal 8a according to the first program is obtained in the same manner as in the second recording mode, and the signals Yb, ( RY) b and (BY) b are similarly converted to obtain the second record T
The CI signal 8b is obtained.

Now, the bandwidths of the first to third recording modes will be examined. It is assumed that the bandwidth of a recording TCI signal that can be transmitted by a head / tape system described later is approximately 8 MHz. First, in the first recording mode, the signal Y relating to the first and second recording TCI signals 8a and 8b is interposed in approximately 3/4 of one line period of the conventional video signal as shown in FIG. Also, since one line period of the HD signal is approximately half of one line period of the conventional video signal, the recording TCI
When the signal is converted into an HD signal, the band of the signal Y is 12 MHz according to the following equation: “8 MHz × 3/4 × 2 = 12 M”
Hz ". Similarly, the bands of the signals PR and PB when the recording TCI signal is converted into the HD signal are respectively 4 MHz according to the following equations.
“8 MHz × １ ／ × 2 = 4 MHz”. Therefore,
The ratio of the band between the signal Y and the signals PR and PB is 3: 1. This
This is because the number of samples of the luminance signal in the MUSE signal is “37”.
3 "and the number of color signal samples" 93 "
Signal ratio is slightly different from 4: 1
The bandwidth of the image signal Y is about 12 MHz, and the signal PR and PB
Considering that the band is about 3 MHz, the MUSE signal
Can be sufficiently recorded with a baseband signal.

Next, in the second and third recording modes, the signal Ya relating to the first and second recording TCI signals 8a and 8b is substantially equal to about 6 in one line period of the conventional video signal as shown in FIG.
Since the recording Ya is inserted in the period of / 8, the band of the signal Ya when the recording TCI signal is converted into the conventional video signal is 6 MHz according to the following equation: “8 MHz × 6/8 = 6 MHz”. Similarly, the bands of the signals (RY) a and (BY) a are respectively 1M according to the following equations.
"8 MHz x 1/8 = 1 MHz". The band 6 MHz of the signal Ya corresponds to a resolution of 480 lines, for example, exceeding the resolution of 420 to 430 lines realized by the conventional high-quality recording method such as the S-VHS method and the height method. The color signal processing band of the home television receiver is 500 KHz.
In many cases, the bandwidth is sufficient for home use.

Here, the configuration of the recording processing means 8 for generating the recording TCI signal will be described in detail with reference to FIG. In the figure, the configuration AA and the configuration BB that alternately perform writing and reading to and from the memory MM are the same configuration, and thus the description of the configuration BB is omitted. The memory MM has first to sixth memory areas M1 to M6 in which writing and reading can be performed independently of each other. For example, the memory MM is constituted by a field memory, and the period of two lines of the HD signal is the same as that of the conventional image. The capacitor has a capacity to absorb a shift due to being slightly shorter than one signal line.

First, in the first recording mode, the switch circuits 80 to 82 select and output the b input and output the signals Y, PB,
Of the PRs, signals related to odd-numbered lines are stored in the first to third memory areas M1 to M3, respectively, and signals related to even-numbered lines are stored in the fourth to sixth memory areas M4 to M6.
Are stored respectively. Then, a signal once stored in the first to sixth memory areas M1 to M6 is read at a predetermined timing using a read clock having a higher frequency than the write clock.

Here, when the line-sequential conversion of color signals is performed by the method shown in FIG. 3, the input a (PR) is always selected by the switch circuit 85, and the input b (P) is selected by the switch circuit 86.
What is necessary is just to comprise so that B) may always be selected. On the other hand, when the method of FIG. 4 is used, it is necessary to switch the signals of the odd line and the even line for each sample point, so that the switch circuits 85 and 86 switch the input for each sample point, and When the circuit selects the a and b inputs, the other circuit selects and outputs the b and a inputs.

The output signals of the switch circuits 85 and 86, the output signals of the first and fourth memory areas M1 and M4, R
Output signals of the OMs 83 and 84 are supplied to selection means 87 and 88, respectively. The first and second recording T shown in FIGS. 2D and 2E obtained by appropriately selecting these input signals.
The signals related to the CI signals 8a and 8b are switched to the switch circuits 89 and 9
0 respectively. Then, similar signals are supplied from the configuration BB to the switch circuits 89 and 90, where the two are combined to obtain the first and second recording TCI signals 8a and 8b. In the case of the first recording mode, the selecting means 87, 88
Are not selected.

The first and second recording TCs thus obtained
FIG. 7 illustrates the I signals 8a and 8b. Numerals in the figure correspond to the line numbers shown in FIG. 5, and signals inserted in the periods Ta and Tb are output signals of the ROMs 83 and 84. That is, "SW" is a signal for securing a margin for head switching, and the head is switched during reproduction during this signal period. “V” is a vertical synchronization signal, “CAL” is a correction signal for matching transmission characteristics between two systems, and “DA” is an information signal such as a time code and an amplitude level.

Next, in the second recording mode, the switch circuits 80 to 82 are irrelevant, and the signals Ya, (RY) a, (B
-Y) a is stored in the first to third memory areas M1 to M3, respectively. Then, a signal once stored in the first to third memory areas M1 to M3 is read at a predetermined timing using a read clock having a higher frequency than the write clock.

The selection means 87 supplies the output signal of the ROM 83, the output signal of the first memory area M1, the output signal of the second memory area M2 obtained via the switch circuit 85, and the third The output signal of the memory area M3 and the output signal of the memory area M3 are supplied to the selecting means 87, respectively, and these signals are synthesized to
A signal relating to the first recording TCI signal 8a shown in FIG. Then, a similar signal is supplied from the configuration BB to the switch circuit 89, where the two are combined to obtain a first recording TCI signal 8a. Note that, in the second recording mode, the output of the selecting means 88 is irrelevant.

Further, in the third recording mode, the signals Ya, (RY) a, and (BY) a relating to the first program are supplied to the first to third memory areas in the same manner as in the second recording mode. The signals are stored in M1 to M3, respectively, and the switch circuits 80 to 82 select the input b, and the signals Yb, (RY) b, and (B) according to the second program are selected.
-Y) b are stored in the fourth to sixth memory areas M4 to M6, respectively.

The selecting means 87 operates in the same manner as in the second recording mode. On the other hand, the selecting means 88 outputs an output signal from the ROM 84, an output signal from the fourth memory area M4, and a switch circuit 86. The obtained output signal of the sixth memory area M6 and the output signal of the fifth memory area M5 are selected by the selecting means 8
8, and synthesizes these signals to supply a signal relating to the second recording TCI signal 8 a to the switch circuit 90. A similar signal is output from the configuration BB to the switch circuit 9.
0, where they are combined to obtain a second recording TCI signal 8b according to the second program.

In this way, the first and second recording TCI signals 8a and 8b corresponding to the first to third recording modes are obtained,
These are converted into FM modulation means 1 through A / D converters 9 and 10.
1 and 12, where the signals obtained by FM modulation are recorded on a magnetic tape T via first and second magnetic heads A1 and A2 and second and third magnetic heads B1 and B2. I have.

In the fourth recording mode, the conventional video signal bb is supplied to the conventional recording means 13 via the selection means 6. The conventional recording means 13 is a well-known recording means such as a VHS method, an 8 mm method, etc., and is obtained by subjecting a luminance signal to emphasis, followed by FM modulation and a chrominance signal by low-frequency conversion. Frequency multiplexing the signal with the recording signal 13a
Has been generated. This signal is recorded on the magnetic tape T using the fifth and sixth magnetic heads C1 and C2.

Now, the arrangement of the magnetic head on the rotating drum will be described with reference to FIG. As shown in the figure, the first, third, and fifth magnetic heads A1, B1, and C1 and the second, fourth, and sixth magnetic heads A2, B2, and C2 have different azimuth angles. They are arranged at the same height position in opposition to each other by 180 °. Furthermore, FM modulation or P
The seventh and eighth magnetic heads D1 and D2 are used in the first to fourth recording modes to record the CM-modulated audio signal.

FIG. 9 shows a tape pattern according to the first recording mode. Numerals in the figure represent line numbers, “SW” represents a signal for securing a switching period, “V” represents a vertical synchronization signal, and “CA”.
“L” represents a correction signal, and “DA” represents an information signal.

Then, the second recording TCI signal 8b for the even-numbered line is read by using the magnetic head B1 as shown in FIG.
Are recorded on the tracks from "SW" to "556 (1/2)" shown in FIG. 4A, and "556 (1/2)" to "111" shown in FIG.
8 ". On the other hand, the first recording TCI signal 8a for the odd-numbered line is
, "SW" to "557" shown in FIG.
(1/2) "and recorded using the magnetic head A1 and" 557 (1/2) "shown in FIG.
2) ”to“ 1119 ”.
The magnetic heads B1 and A2 or the magnetic heads B2 and A1, which are disposed close to each other, perform simultaneous recording, respectively, and the preceding magnetic heads D2 and D1 use the audio tracks A and A in FIG. B are formed respectively. It is needless to say that the magnetic tape pattern shown in FIG. 3B can be obtained by appropriately setting the mounting height of the magnetic heads A1, A2, B1, B2 and the magnetic heads D1, D2. In this manner, one frame is recorded, and this is repeated to form a tape pattern.

In the second recording mode, the tape running speed is reduced to 1/3 of that in the first recording mode, and the magnetic head A
1A2, a signal of one field is recorded on each track shown in FIG. Note that the audio signal is recorded in a deep layer using the magnetic heads D1 and D2 preceding them. Further, it goes without saying that the magnetic heads B1 and B2 may be used instead of the magnetic heads A1 and A2.

In the third recording mode for recording two programs of a conventional video signal with high image quality, the first and second programs according to the first and second programs are operated at the same tape running speed as in the first recording mode. The second recording TCI signals 8a and 8b are recorded by using magnetic heads A1 and A2 and magnetic heads B1 and B2 on the respective tracks where the video signals shown in FIG. 1 are recorded, respectively. Note that the audio signal is recorded in a deep layer using the magnetic heads D1 and D2 preceding them.

Further, in the fourth recording mode, a tape pattern is formed by using the magnetic heads C1 and C2 having a head width of three tracks formed in the first recording mode.

In this way, a video signal can be recorded corresponding to each recording mode.

Next, the video signal reproducing apparatus will be described. In FIG. 10, when reproducing the magnetic tape recorded in the first to third recording modes, the magnetic heads A1, A2
And a signal reproduced from the magnetic tape T with the magnetic head B1, B2, F in the first, second demodulating means 20, 21
M demodulation is performed to obtain first and second reproduced TCI signals, and these signals are supplied to reproduction processing means 24 described later via A / D converters 22 and 23.

On the other hand, when reproducing a magnetic tape recorded in the fourth recording mode, a signal reproduced from the magnetic tape T using the magnetic heads C1 and C2 is supplied to a well-known conventional reproduction processing means 32. Here, the signal is separated into an FM modulated luminance signal occupying a relatively high frequency band and a low-frequency converted chrominance signal occupying a relatively low frequency band. Then, the reproduced video signal 32a is reproduced by adding the reproduced luminance signal obtained by performing processing such as FM demodulation and de-emphasis to the former and the reproduced color signal obtained by performing high-frequency conversion on the latter to reproduce the conventional video signal 32a. The signal is supplied to a transmission line (not shown) via the communication line.

Here, the reproduction processing means 24 complementary to the recording processing means 8 will be described in detail with reference to FIG. 11. The configuration CC and the configuration DD for alternately writing and reading data to and from the memory MM are described below. Have the same configuration, the configuration DD
Is omitted. A write clock used for writing to the memory MM is generated based on a horizontal synchronizing signal separated from the first and second reproduced TCI signals 20a and 20b. The clock has the same frequency as the clock, and the read clock used at the time of reading has the same frequency component as the write clock at the time of recording. This memory MM can also be used as a video signal recording device.

First, when reproducing the magnetic tape T recorded in the first recording mode, the signal Y in the first reproduced TCI signal 20a relating to the odd-numbered line is transferred to the memory means M
The signal Y in the second reproduced TCI signal 21a for the even-numbered line is stored in the first memory area M1 in M.
Is stored in the fourth memory area M4. The color difference signals line-sequentially converted by the method shown in FIG. 3 are the signals P relating to the first and second reproduced TCI signals 20a and 21a.
R and PB are respectively written in the second and sixth memory areas M2 and M6, and the a and b inputs are respectively selected by the switches 40 and 41, and the same signal is set as PR2, 4..., PB1, 3. , And write to the third memory areas M5 and M3. However, the PR to be written to the fifth and third memory areas M5 and M3
, PB1, 3,..., May write the average of the upper and lower lines. For example, as shown in FIG.
D, and “PR2 = (PR1 + P
R3) / 2 "and" PB3 = (PR2 +
PR4) / 2 ". Note that the color difference signal line-sequentially converted by the method illustrated in FIG. 4 will be described later.

Then, the first to third memory areas M1 to M
3 and the fourth to sixth memory areas M4 to M4.
The signals read from M6 correspond to a,
These signals are supplied to the b inputs, respectively, and these are supplied to the switches 45 to 46 with signals obtained by selecting the a and b inputs for each line. The switches 45 to 46 supply a signal obtained by synthesizing signals supplied from the components CC and DD to a synchronization signal adding means (not shown), and a signal Y obtained by adding a synchronization signal relating to the HD signal here. , PR, and PB are supplied to selection means 28 via D / A converters 25 to 27.

When the color difference signal line-sequentially converted by the method shown in FIG. 4 is reproduced, the constructions CC and DD relating to the reproduction processing means 24 are as shown in FIG. Then, the arithmetic processing of the arithmetic circuits 51 and 52 in the figure will be described with reference to FIG. When the line-sequential conversion is performed on a pixel-by-pixel basis in this way, as shown in FIG. 13, in order to predict the sample point S0 not transmitted, the upper and lower sample points S1, S1
4, the prediction can be made based on the information of the left and right sample points S2 and S3.
At 52, the arithmetic processing of “S0 = (S1 + S2 + S3 + S4) / 4” is performed for each sample point that is not transmitted.

Next, a case where the magnetic tape T recorded in the second recording mode is reproduced will be described with reference to FIG. First
The signals Ya, (RY) a, (B-
Y) a is stored in the first to third memory areas M1 to M3, respectively. At this time, the switch 40 is irrelevant, and the switch 41 selects the a input. The signals obtained by reading out the stored signals at predetermined timings are supplied to the switches 45 to 47 via the switches 42 to 44 for selectively outputting the input a. A signal obtained by combining the output signals of the components CC and DD by the switches 45 to 47 is supplied to a synchronization signal adding means (not shown), and a signal Ya obtained by adding a synchronization signal related to a conventional video signal here , (R
-Y) a and (BY) a are supplied to the selection means 28 via the D / A converters 25 to 27.

Further, when reproducing the magnetic tape T recorded in the third recording mode, a signal is output from the first reproduced TCI signal 20a according to the first program in the same manner as in the above-mentioned second recording mode. Ya, (RY) a, and (BY) a are generated. Further, the b input is selected by the switch 40, and the signals Yb, (R-R) in the second reproduced TCI signal 21a according to the second program are selected.
Y) b and (BY) b are temporarily stored in the fourth to sixth memory areas M4 to M6, respectively. The signals read out at predetermined timings are supplied to the switches 48 to 50, respectively. A signal obtained by synthesizing the output signals of the components CC and DD by the switches 48 to 50 is supplied to a synchronization signal adding means (not shown), and a signal Yb obtained by adding a synchronization signal related to a conventional video signal here. , (RY) b and (BY) b are supplied to the second encoder 30 via a D / A converter (not shown).

As described above, the reproduction processing means 24 can be used also when reproducing the magnetic tape T recorded in the first to third recording modes. Can also be used.

When reproducing the first recording mode, the selecting means 28 shown in FIG. 10 outputs the signals Y, PR, PB
Are selectively output to a transmission path (not shown), while the signals Ya, (RY) a, and (BY) a are supplied to the first encoder 29 when reproducing the second and third recording modes. Here, the conventional video signal aa obtained by converting the composite video signal is supplied to a transmission line (not shown). In the third recording mode, the second video encoder 30 converts the signals Yb, (RY) b, and (BY) b into a composite video signal and converts the conventional video signal bb to the selection unit 31. The signal is supplied to a transmission line (not shown) via the communication line.

In the above-described embodiment, the second and third
The ratio of the periods X, Y, and Z of the first and second recording TCI signals shown in FIG. 2 (I) according to the recording mode described above is exemplified as 1: 1: 6, but the present invention is not limited to this. For example, when a signal related to computer graphics is recorded, the reproduced signal (1.6: 1.6: 4.8) is set in consideration of the wide band of the color signal. R
-Y) a, (BY) a, Ya band 1.6MHz, 1.6MH
It is a matter of course that the band of the luminance signal and the color difference signal may be balanced with z, 4.8 MHz.

[0052]

As described above, according to the configuration of the present invention, when recording a high-definition video signal having a large number of scanning lines, the present invention relates to the high-definition video signal. One of the first and second line-sequential color signals obtained by thinning out the first and second color difference signals line by line is recorded by compressing the time axis. However, when recording a conventional video signal, Since the first and second color difference signals are recorded by directly compressing the time axis, the color difference signals can be recorded according to the number of scanning lines, and the vertical resolution of the color difference signals is visually deteriorated in a limited predetermined band. There is an effect that recording can be performed without causing the recording. In addition, conventional video signals
When recording high-definition video signals.
Of the existing memory area
And separate high-definition video signal memory means.
The effect that each recording signal can be obtained without mounting
There is.

According to the second aspect of the present invention, as described above, the ratio of the time axis compression ratio of the color difference signal to the time axis compression ratio of the luminance signal when a conventional video signal is recorded. Since the ratio is larger than the ratio when recording the high-definition video signal, the band of the luminance signal and the color difference signal can be distributed more suitable for viewing at home than when the same ratio is used. As a result, a high quality video signal can be recorded not only when recording a high definition video signal but also when recording a conventional video signal.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a video signal recording device according to an embodiment of the present invention.

FIG. 2 is a timing chart of FIG.

FIG. 3 is a conceptual diagram illustrating one mode of line sequential processing.

FIG. 4 is a conceptual diagram for explaining another aspect of the line sequential processing.

FIG. 5 is a conceptual diagram for explaining division of a high-definition video signal.

FIG. 6 is a block diagram illustrating a recording processing unit.

FIG. 7 is a waveform diagram of a TCI signal.

FIG. 8 is a plan view of a rotating drum.

FIG. 9 is a conceptual diagram for explaining a magnetic tape pattern.

FIG. 10 is a block diagram illustrating a video signal reproducing apparatus according to an embodiment of the present invention.

FIG. 11 is a block diagram for explaining a reproduction processing unit.

FIG. 12 is a block diagram for explaining a reproduction processing unit according to another mode of line sequential processing.

FIG. 13 is a conceptual diagram for explaining an operation of an arithmetic circuit according to another mode of line sequential processing.

[Explanation of symbols]

 8 Record processing means 8a, 8b First and second recorded TCI signals aa, bb Conventional video signal MM memory Y, PB, PR HD signal (high-definition video signal) (BY) a, (BY) b first color difference signal (RY) a, (RY) b second color difference signal

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H04N 5/91-5/956 H04N 9/79-9/898

Claims (2)

(57) [Claims] 1. A video signal recording method for recording a conventional video signal and a high-definition video signal having a larger number of scanning lines than the signal, wherein the conventional video signal is recorded when the conventional video signal is recorded. When the first and second chrominance signals and the luminance signal are time-axis-compressed for each line, these signals are time-division multiplexed and recorded for each line, and the high-definition video signal is recorded. One of the first and second line-sequential color signals obtained by thinning out the first and second color difference signals related to the high-definition video signal line by line and a luminance signal for each line. Each time axis is compressed, and these signals are
When recording by time-division multiplexing for each line , and recording the conventional video signal, the high-definition video signal
A video signal recording method characterized by using a part of a memory area used for recording a video signal. 2. A conventional video signal and a signal having more scanning lines than this signal.
Video signal recording method for recording high definition video signals.
Therefore, when recording the conventional video signal,
The first and second color difference signals and the luminance signal are
These signals are compressed on the time axis, and these signals are time-division multiplexed for each line.
When the high-definition video signal is recorded, the high-definition
Thinning out the first and second color difference signals related to the signals for each line
One of the obtained first and second line-sequential color signals and a luminance signal
Are time-axis-compressed line by line, and these signals are
The time-division multiplexing is recorded for each line, and the ratio of the time-axis compression ratio of the chrominance signal to the time-axis compression ratio of the luminance signal in the case of recording the conventional video signal is the high-definition video signal. A video signal recording method characterized in that the ratio is larger than the ratio in recording.