JP2939960B2 - Video signal recording device, video signal reproducing device, and method of recording video signal on magnetic tape - 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 device, a video signal reproducing device, and a method for recording a video signal on a magnetic tape.

[0002]

2. Description of the Related Art Conventionally, as a technique for high-density magnetic recording / reproducing, there is known a segment recording method for dividing one screen and recording / reproducing on a plurality of tracks. This method has a plurality of systems of signal processing means for recording and reproducing one screen with a plurality of heads. However, there is a drawback that line flicker or field flicker occurs due to a difference in characteristics between these signal processing means. Was.

[0003] Therefore, as a magnetic recording / reproducing apparatus which solves such a drawback, "UNI" which is one system of a high definition VTR.
HI "or Hi-Vision VTR (" Consumer Hi-Vision VTR "Television Society Technical Report VOL.15 NO.50)
Has been proposed. In these conventional VTRs, in order to solve the above-mentioned drawback, a plurality of correction signals for correcting characteristics between a plurality of signal processing means are recorded at the beginning of a track formed on a magnetic tape, and the plurality of correction signals are recorded at the time of reproduction. And the characteristic between the signal processing means of a plurality of systems is corrected by reproducing the correction signal.

[0004]

However, if a predetermined period is required to always record a plurality of correction signals irrelevant to a picture, there is a disadvantage that the use efficiency of a recording medium is reduced. Was. If the types of the correction signals are limited, the characteristics that can be corrected between the signal processing units are limited.

In some cases, it may be desired to appropriately set the type of the correction signal according to the grade of broadcasting, business, home, or the like, or a high-grade model, a popular model, or the like.

Accordingly, the present invention improves the utilization efficiency of a recording medium, corrects a plurality of types of characteristics, and can appropriately set the type of a correction signal, a method of recording a video signal on a magnetic tape, and a method of recording a video signal on a magnetic tape . It is an object to provide a video signal reproducing device.

[0007]

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

In a video signal recording apparatus for recording a plurality of recording signals obtained by dividing at least a plurality of video signals on a recording medium, a correction signal for appropriately generating one correction signal selected from a plurality of types of correction signals. Generating means, an information signal generating means for generating an information signal indicating at least whether or not the one correction signal is generated, and inserting the one correction signal and the information signal into predetermined lines of the plurality of recording signals. A video signal recording device, comprising: a recording unit that records the data on a recording medium.

A video signal for reproducing a recording medium on which one correction signal obtained by appropriately selecting from a plurality of types of correction signals and an information signal indicating at least whether or not the one correction signal has been recorded are recorded together with the video signal. A reproducing apparatus, wherein the reproduced information signal corrects a characteristic of the reproduced video signal based on the one correction signal when the reproduced information signal indicates the recording of the one correction signal, and the reproduced information signal And a correction unit that does not correct the characteristics of the reproduced video signal when it does not indicate recording of the one correction signal.

A plurality of recording signals obtained by dividing at least a plurality of video signals are recorded on a magnetic tape by a magnetic head.
A video signal recording method for forming a tilt track, and at least representative of the information signal to the presence or absence of the recording of a plurality of types of correction signals one obtained by appropriately selecting from the correction signal and the one of the correction signals, said plurality of and interposed in a predetermined line of the recording signal
Recording on magnetic tape , characterized in that
Video signal recording method .

[0011]

FIG. 1 is a waveform diagram of an information signal, FIG. 2 is a waveform diagram for explaining a line of an information signal inserted into an HD signal,
FIG. 3 is a block diagram for explaining a main part of the video signal recording apparatus according to one embodiment of the present invention, FIG. 4 is a conceptual diagram for explaining the operation of the dividing means, FIG. 5 is a waveform diagram of a TCI signal,
6 is a waveform diagram for explaining the operation of the modulating means, FIG. 7 is a waveform diagram of the TCI information signal, FIG. 8 is a tape pattern in the W mode, and FIG. 9 is a waveform diagram of the TCI signal in the W-NT mode and the 2NT mode. FIG. 10 is a tape pattern in the W-NT mode and the 2NT mode, and FIG. 11 is a block diagram for explaining a main part of the video signal reproducing apparatus according to one embodiment of the present invention. This embodiment relates to a video signal recording / reproducing apparatus for recording and reproducing a high-definition video signal and a conventional video signal. Here, an HD signal is used as an example of a high-definition video signal, and an NTSC is used as an example of a conventional video signal. Take the signal and explain.

An HD signal or an NTSC signal which is an output signal of the video signal recording / reproducing apparatus according to the present embodiment has an information signal on a predetermined line. The video signal recording / reproducing apparatus according to this embodiment uses an NTSC signal as an input signal. Therefore, the information signal will be described first, then the recording system, and finally the reproduction system.

(Information Signal) FIGS. 1A and 1B show a luminance signal (hereinafter abbreviated as "Y signal") or an NT signal relating to an HD signal.
FIG. 2 illustrates lines of information signals inserted into the SC signal. The contents of the information signal include a preamble signal (8 bits) for synchronizing clocks during reproduction, a synchronization signal (8 bits) for identifying the start of data, and a video signal as shown in FIG. Signal (56 bits) indicating the type of the data, a time code signal (32 bits) indicating time information, an error correction signal (16 bits) for performing error detection and correction during reproduction, and a level for managing a recording level It consists of a reference signal (corresponding to 8 bits). The normal level of the level reference signal is 50 IRE, and each bit of the other signals is 20 IRE when “8” is set to “0”.
0IRE corresponds to "1".

The data signal is composed of 7 words in units of 8 bits. The first word relates to the format of the video signal and includes aspect ratio information (for example, 16: 9,
4: 3 identification), image display format information (for example, letterbox or normal identification), and track format information (for example,
HD, NTSC, EDTV, etc.) and telecine information (for example, identification of the same frame).
The second word is a program I representing a program number.
D information is stored. The third word includes audio information (for example, identification of stereo, mono, bilingual, etc.), editing information (for example, identification of editing start, editing end, editing, etc.), and correction signal information (for example, correction signal Control signal information (for example, VISS, V
(Identification of the duty ratio of a control signal such as ASS). The fourth and fifth words are text information and represent character information or the like by a so-called closed caption method. Note that the sixth and seventh words are spare words for ensuring future expandability.

The time code signal is composed of 4 words in units of 8 bits. The first word is a frame number incremented by one frame, and the second word is “second”.
, The third word represents “minute”, and the fourth word represents “hour”.

Next, the line on which the information signal is inserted is defined as HD
The signal and the NTSC signal will be described separately. The case of the HD signal will be described with reference to the waveform diagram of the HD signal shown in FIG. The numbers shown in the figure represent line numbers, and the first line starts from the start of the vertical synchronization signal of the odd field.

Here, the line on which the information signal is to be inserted is:
Since the vertical blanking period and the horizontal synchronization signal period including the vertical synchronization signal may be deleted by the Hi-Vision device, it is necessary to insert a level standard signal in the effective scanning line, and since the information signal is not a picture signal, 8% to 1% of all scanning lines so as not to be displayed on the monitor screen
It is necessary to consider that the monitor has an overscan characteristic of 0%.

Considering these points, the lines on which the information signal is inserted are 41 to 66 lines of the HD signal.
Line, 532-557 line, 603 line-628
One line or a plurality of lines among the lines and 1095 lines to 1120 lines. By the way, since the number of scanning lines that the monitor actually overscans varies for each device, it is more effective to insert an information signal into a scanning line that is an effective scanning line and has a low possibility of appearing on the screen. desirable. In a studio standard HD signal, the number of effective scanning lines is 1,035, and the effective picture period is 41 to 557 lines and 603 to 112 lines.
0 line. On the other hand, in the MUSE decoder output signal, there are 1032 effective scanning lines, and the effective picture period is 42 to 557 lines and 604 to 1119.
Line.

Therefore, 41,557,603,1120
The line and the 42, 604, 557, and 1121 lines are effective scanning lines, and are lines that satisfy the above-described conditions that are unlikely to appear on the screen. Therefore, 41, 42,
It is desirable to insert the information signal into one or more of the 557, 603, 604, 1120 and 1121 lines.

Further, 41 lines and 603 lines are effective scanning lines of a studio standard HD signal, and
This is a line that is not an effective scanning line of the USE decoder output signal. Therefore, assuming that the HD signal is not encoded into the MUSE signal, it is desirable to insert the information signal into 41 lines and / or 603 lines.

Therefore, the video signal magnetic recording / reproducing apparatus according to the present embodiment inserts the information signal into the 603 line of the HD signal and outputs the signal. The input HD signal is changed to the 603 line or 604 line in consideration of the output signal of the MUSE decoder. It is assumed that an information signal is inserted.

On the other hand, in the case of the NTSC signal, similarly to the HD signal, the information signal is inserted into 19 lines which are effective scanning lines and are less likely to appear on the screen, and are output. An information signal is inserted between the input signals.

(Recording system) Referring to FIG.
The recording system of a video signal recording / reproducing apparatus for recording / reproducing an SC signal will be described. This video signal recording / reproducing apparatus includes a W mode for recording an HD signal at a standard tape traveling speed, and an NTSC signal for a long time at a tape traveling speed. Program recording W-
NT mode and NTSC signal at standard tape speed 2
There is a 2NT mode for program recording.

First, the W mode will be described. In FIG. 1, an input Y signal aa (luminance signal) and an input PB, PR signal bb, cc (color signal) are transmitted from a transmission line (not shown).
C means 1 to 3 respectively. Here, input Y, P
The B and PR signals are signals conforming to 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) And the above-mentioned AGC Means 1 to 3 correct the amplitude level of each signal based on the level reference signal in the information signal relating to the output signal 4a of the A / D converter 4, and the level reference signal is inserted into the 603 line. When the level reference signal is interposed in the line 603 and the level reference signal is inserted in the line 604, the level reference signal is used first.
4 when the line-level reference signal to either is not inserted performs level complement <br/> positive based on the amplitude level of the horizontal synchronizing signal.

Then, the input Y, PB, PR signals aa, bb, and cc having the normal amplitude levels are converted into A / D converters 4.
To the dividing means 7 through. This dividing means 7 is an A / D converter for input Y, PB, PR signals aa, bb, cc.
It plays the role of dividing the output signals of the converters 4 to 6 into two systems. This division processing will be described with reference to FIG. 4. The input Y, PB, PR signals aa, bb, cc shown at the upper left in FIG.
(HD signal), the number of effective scanning lines of the MUSE signal (1032
) Is generated, and this signal is divided into two systems of signals shown on the lower left and lower right in FIG. The first Y, PB, PR signals 7a, 7b,
7c and the second Y, PB, PR signals 7d, 7e, 7f are supplied to first and second selecting means 8, 9, respectively.

The first and second selecting means 8 and 9 are for appropriately selecting an input signal in the W mode, the W-NT mode and the 2NT mode.
B, PR signals 7a, 7b, 7c and second Y, PB, PR
The signals 7d, 7e and 7f are selectively output to the first and second TCI converters 16 and 17, respectively. In the W-NT mode, the first selecting means 8 converts the third Y, PB, PR signals 14a, 14b, 14c into the first TCI converting means 16.
Selective output. In the 2NT mode, the third Y, PB and PR signals 14a, 14b and 14c and the fourth Y, PB and PR signals 15a, 15b and 15c are
Selectively output to the second TCI conversion means 16 and 17, respectively.
In the W-NT mode, only one system is required.
The second selecting means 9 does not output any input signal.

Then, the first and second TCI processing means 1
6, 17 are the first and second PB signals 7b, 7e and the first,
The second PR signals 7c and 7f are converted into line-sequential color signals,
A compressed line-sequential color signal obtained by time-compressing this signal,
First and second TCI signals 16 obtained by time-division multiplexing a compressed luminance signal obtained by time-compressing the second Y signals 7a and 7d.
a and 17a are supplied to third and fourth selecting means 18 and 19, respectively.

Then, the third and fourth selecting means 18 and 19
Are the first and second TCI signals 16a and 17a related to the picture
5, the TCI information signal 20a, the correction signal 21a, and the blanking signal 22a.
The recording signals 18a and 19a are generated. That is, in the period T1 shown in FIG.
a and 17a are selected, and the blanking signal 2
2a, the TCI information signal 20a is selected in the period T3, and the correction signal 21a is selected in the period T4. still,
The signal indicated by "SW" in FIG. 5 is a switching signal for securing a margin for switching the magnetic head.
The signal indicated by “V” is a vertical synchronization signal, and “DA”
The signal shown by is an information signal, and the signal shown by "CAL" is a correction signal.

The information signal generating means 20 for generating the TCI information signal 20a will be described with reference to FIG. The time code signal generating means 200 includes a counter or the like,
At the start of the recording of the input HD signal, the counter is reset to "0", and the count value is incremented (incremented) every time one field or one frame is recorded. A code signal 200a is obtained, and this signal is supplied to a dividing means 201 and an error correction signal generating means 204.

The dividing means 201 has a role of specifying the relationship between the time code signal 200a and the type of the correction signal 21a described later. Here, it is desirable that the type of the correction signal 21a be large in view of correcting various characteristics. However, as the type of the correction signal 21a increases, the configuration becomes more complicated. ,
It is convenient if the type can be set according to the grade of the popular model. It is also necessary to ensure expandability so that it is possible to cope with a case where a correction signal that is not assumed at present is desired to be used in the future. Therefore, the maximum type of correction signal including the possibility in the future is set to Q types (Q is a natural number of 2 or more) and the type of correction signal actually used is set to R types (R is a natural number and R
≦ Q), the remainder obtained by dividing the first word representing the frame number in the time code signal 200a by “Q” is used as the first control signal 201a and the data signal generation means 2
02 and the selection means 214 in the correction signal generation means 21. In the present embodiment, the following description will be made on the assumption that Q = 5.

The first control signal 201a and the information signal in the output signal 4a of the A / D converter 4 are supplied to the data signal generation means 202, and the latter is supplied to a predetermined level (for example, the maximum level of the horizontal synchronizing signal). ) Is used as a threshold to identify an information signal, perform processing such as error correction / detection, and replace a data signal 202a obtained by replacing changed information such as program ID information, editing information, and correction signal information with new information. It is supplied to an error correction signal generating means 204. As described above, the correction signal information is for identifying the presence or absence of a correction signal. Here, three types of correction signals are prepared by the correction signal generating means 21 described later, and the first control signal 201a is set to “0”.
Assuming that the above three types of correction signals are generated corresponding to “1” and “2”, the first control signal 201a becomes “3”.
In the case of representing "4", the correction signal 21a is not recorded, so the correction signal information is set to "0" indicating no correction signal, while the first control signal 201a represents "0""1""2". In this case, the correction signal information is changed to “1” indicating the presence of the correction signal. When no information signal is inserted in the 603 line or the 604 line (for example, when a broadcast HD signal is recorded), the data signal 202a
The data signal 202a is generated based on the output of a determination unit (not shown) that determines information necessary for generating a data signal, such as a format type of a video signal and an audio signal.

The time code signal 200a and the data signal 202a are supplied to an error correction signal generating means 204, and a Reed-Solomon code is generated for these signals, and an output obtained by adding this code to an input signal is obtained. A signal is supplied to one input of the modulation means 206. Modulation means 2
A preamble signal and a synchronization signal are supplied from the additional signal generation means 205 to the other input of 06.

The modulating means 206 converts the binary input signal into ternary data, so that emphasis means 25 and 26, which will be described later, emphasize the high frequency components immediately after the edge. The spike level is reduced so as not to exceed the limiter level limited by limiter means 27 and 28 for preventing overmodulation.
Specifically, FIG. 6A shows a clock signal, and six periods of the clock signal are shown in FIG.
Corresponds to one bit of the input signal shown in FIG. Then, as shown in FIG. 3C, when the input signal changes from “1” to “0” and is the current “0” bit, 50, 20, 20, 20, 20, When the bits of “0” are continuous so as to be 20,20 IRE, the input signal is changed from “0” to “1” so that the value becomes 20, 20, 20, 20, 20, 20 IRE for each sample of the clock signal. "And changes to 50, 80, 80, 80, 8 for each sample of the clock signal if the bit is currently" 1 ".
If the bits of “1” are continuous so that the value becomes 0,80 IRE, 80,80,80,80,80,80IRE
Modulate so that The output signal of the modulating means 206 obtained in this manner is output to an emphasis means 25, which will be described later.
At the output of 26, the signal shown in FIG. 4D is obtained, and does not exceed the limiter level.
At 28, no edge information is lost.

The output signal of the modulating means 206 is supplied to the selecting means 207, where the normal reference level (50IRE) supplied from the level reference signal generating means 203 is supplied.
Are time-division multiplexed with a synchronization signal or the like supplied from a synchronization signal generating means (not shown) to obtain a TCI information signal 20a shown in FIG. Then, the information signal inserted in the 603 line or 604 line of the Y signal aa is time-axis compressed in a period t1 in FIG. The compression ratio is set to be the same as the compression ratio of the Y signal aa. By setting like this, in the future,
It is possible to cope with a case where an information signal is inserted into the PB and PR signals bb and cc.

The correction signal generating means 21 comprises first to third ROMs 210 to 212 storing different first to third correction signals 210a, 211a, 212a, respectively, and a selection means 213. The first to third correction signals 210a, 211a, 212a are converted to the first control signal 20.
The correction signal 21a is obtained by selecting and outputting the selection signal 213 based on 1a. That is, when the first control signal 201a indicates “0”, “1”, and “2”, the first to third correction signals 210a, 211a, and 212a are respectively selected, and the first control signal 201a is set to “3”. When "4" is indicated, a blank signal consisting of a synchronization signal output from a ROM (not shown) and a pedestal level is selected. The first to third correction signals 210a, 211a, 212a are, for example, a ramp signal for correcting linearity between two systems, a gray scale signal for adjusting a DC level and an amplitude level between two systems, A multi-burst signal for correcting the frequency characteristic between the systems, a 2T pulse signal for correcting the phase characteristic between the two systems (in the form of SIN square, the frequency period whose half-value width corresponds to １ ／ of the band) Signal).

The blanking signal generating means 22 outputs R
OM or the like, and a blanking signal 22a composed of the above-described switching signal and vertical synchronization signal.
(Interpolated during period T2 in FIG. 5).

As described above, the first and second TCI signals 16a, 17a, the TCI information signal 20a, the correction signal 21a, and the blanking signal 22a relating to the picture are connected to the third and fourth selecting means 18, Nineteenth is the first, selected and obtained
The second recording signals 18a, 19a are converted to D / A converters 23, 2
4 to the emphasis means 25 and 26, respectively.

The emphasis means 25 and 26 emphasize high frequency components in the horizontal direction. Then, the output signals of the emphasis means 25 and 26 are
After the amplitude is limited at 7, 28, FM modulation means 29, 3
At 0, the signal modulated by the predetermined deviation is amplified to a predetermined level by a recording amplifier (not shown) and recorded on the magnetic tape TT via the magnetic heads 1A and 1B and the magnetic heads 2A and 2B. ing.

Here, the tape pattern of the magnetic tape TT will be described with reference to FIG. The numbers in the figure represent line numbers, "SW" is a switching signal, "V" is a vertical synchronizing signal, "CAL" is a correction signal, and "DA" is a TCI information signal. Each is represented.

The first recording TCI signal 18a for the even-numbered line is converted from "SW" to "556 (1)" shown in FIG. 8A by using the magnetic head 1A provided on the rotating drum. / 2) ”and recorded using the magnetic head 1B using the magnetic head 1B.
56 (1/2) "to" 1118 ". On the other hand, the second recording T for the odd-numbered line
The CI signal 19a is transmitted from “SW” to “5” shown in FIG. 8A using the magnetic head 2A disposed on the rotating drum.
57 (1/2) ", and using the magnetic head 2B, the" 557 "shown in FIG.
(1/2) ”to“ 1119 ”. Also, the magnetic heads 1A,
2A or the magnetic heads 1B and 2B perform simultaneous recording,
Preceding audio magnetic heads 3A, 3B (not shown)
Thus, audio tracks A and B in FIG. 8A are formed. It is needless to say that the magnetic tape pattern shown in FIG. 8B can be obtained by appropriately setting the mounting height of the magnetic heads 1A, 2A, 1B, 2B and the audio magnetic heads 3A, 3B.

Here, a W-NT mode for recording one program of an NTSC signal at a tape running speed for a long time,
The 2NT mode for recording two TSC signals at the standard tape running speed will be described. In the W-NT mode, the tape running speed is changed to 1/3 times the standard tape running speed, NTSC signals for one field are subjected to predetermined processing and recorded on each track shown in FIG.
In the T mode, predetermined processing is performed on the NTSC signal for one field on each track related to the video signal shown in FIG. 8 at a standard tape running speed, and the program is recorded one program at a time.

In FIG. 3, the transmission lines (not shown)
The second NTSC signals dd and ee are supplied to the AGC means 12 and 13 respectively.
After correcting the amplitude level based on the level reference signal in the information signal relating to the output signals of the A / D converters 12 and 13, The second NTSC signal dd, ee is converted by the conversion means 14, 1
5 is supplied. These conversion means 14 and 15 are third Y, PB and PR signals 14a and 14 which have been subjected to predetermined arithmetic processing.
b, 14c and the fourth Y, PB, PR signals 15a, 15
b and 15c are supplied to first and second selecting means 8 and 9, respectively. In the W-NT mode, the second NTSC signal ee
Does not operate.

Then, the first and second selecting means 8 and 9 select the third Y, PB and PR signals 14a, 14b and 14c and the fourth Y, PB and PR signals 15a, 15b and 15c. Then, it is supplied to the first and second TCI conversion means 16 and 17, respectively. Here, in the case of the HD signal described above, PB,
Although the PR signal was subjected to line-sequential processing, the NTSC signal was not subjected to line-sequential processing because the number of scanning lines was small.
PB and PR signals 14b and 14c and the fourth PB and PR
A signal obtained by compressing the signals 15b and 15c on the time axis,
A signal obtained by compressing the third Y signal 14a and the fourth Y signal 15a on the time axis is multiplexed on the time axis to obtain first and second TCIs.
The signals 16a and 17a are obtained.

The first and second TCI signals 16
a, 17a, the TCI information signal 20a, the correction signal 21a, and the blanking signal 22a by the third and fourth selecting means 1.
8 and 19, the first and second recording signals 18a and 19a shown in FIGS. Also,
FIG. 10A shows a magnetic tape pattern on which the first and second recording signals 18a and 19a are recorded. FIG. 3B shows a magnetic tape pattern in the W-NT mode.

In this manner, in any of the W mode, W-NT mode, and 2NT mode, a magnetic tape TT on which a plurality of types of correction signals having a fixed relationship with the time code signal in the information signal are sequentially recorded is prepared. can do.

(Reproduction System) The reproduction system will be described from W mode with reference to FIG. In the figure, a magnetic tape TT
After the signals reproduced using the magnetic heads 1A and 1B and the magnetic heads 2A and 2B are amplified to a predetermined level by a preamplifier (not shown), the FM demodulation means 40 and 41 demodulate the signals.
M demodulation is performed. Then, after the output signal is attenuated by the de-emphasis means 42 and 43 having a complementary relationship with the emphasis means 25 and 26, the high frequency component in the horizontal direction is attenuated, and then passed through the A / D converters 44 and 45. The obtained first and second reproduced signals 44a, 45a are used as correction means 46, 4
7 is supplied.

The correction means 46 and 47 provide the correction signal 2
The second control signals 48a and 49, which will be described later, indicating the type of 0a.
The first and second reproduced signals 44a and 45a are corrected in accordance with a. However, it is not necessary to provide a configuration corresponding to all types of correction signals, and it is only necessary to correspond to a predetermined correction signal according to an application or a grade. In order to perform the correction corresponding to the above-described first to third correction signals 210a, 211a, and 212a, for example, the above-described correction signal generating means 21 outputs the second control signal 48 instead of the first control signal 201a.
a, 49a to generate a normal correction signal, and based on a difference obtained by comparing the level of the normal correction signal with the reproduced correction signal by comparing means (not shown), the first and second signals are obtained. The second reproduction signals 44a and 45a may be corrected.
The output signals of the correcting means 46 and 47 are output to the TCI determining means 50 and 51 and the first and second TCI inverse converting means 56 and 51, respectively.
57. It is needless to say that the type of the correction signal generated in the recording system and the type of the correction signal used in the reproduction system do not need to match in one video signal recording / reproducing apparatus.

The TCI determining means 50 and 51 determine whether the reproduced TCI information signal 20a is "0" or "1" by maintaining the level of the period t2 or t3 in FIG. This is performed as a threshold value, and for the level reference signal, the discrimination signals 50a, 50
1a is supplied to the correction control means 48, 49 and the generation means 52, 53.

Here, the correction control means 48 and 49 will be described. Since they have the same configuration, the correction control means 48 will be described in detail. The discrimination signal 50a is supplied to the TCI dividing means 480, and selects a signal representing a remainder obtained by dividing the time code of the time code signal in the discrimination signal 50a by "Q = 5" in the same manner as the above-described dividing means 201. To the means 483. The selecting means 483 has a role to exclude an inappropriate output signal of the TCI dividing means 480 as the second control signal 48a, and is not used when the correction signal is not recorded or when the information signal is incorrect. Excluded from the control signal 48a as deemed appropriate. That is, the error detection means 481 detects an error in the information signal using the above-described error correction signal.
Is correct, "1" is supplied to the selection means 483.
The correction signal information discriminating means 482 extracts the correction signal information from the information signal, and selects “0” when the correction signal is not inserted and “1” when the correction signal is inserted.
Supply 3 Then, the selection means 483 determines that both are “1”.
Only in the case of (2), the second control signal 48a is supplied to the correction means 46.

The generation means 52 generates an information signal by extending the time axis of the discrimination signal 50 a, and supplies the information signal to the selection means 63. The selecting means 63 inserts an information signal into the 603 line of the Y signal. The generation means 53 will be described later because it is used in the 2NT mode. On the other hand, the first and second TCI
The inverse conversion means 56 and 57 have a complementary relationship with the first and second TCI conversion means 16 and 17 and extend the time axis of the compressed luminance signal and the compressed line-sequential color signal, and convert the line-sequential color signal. Demodulated to obtain the first reproduced Y, PB, PR signal 56
a, 56b, 56c and the second reproduced Y, PB, PR signals 5
7a, 57b, and 57c, and these signals are converted to the fifth and fifth signals.
The signal is supplied to the synthesizing means 62 via the sixth selecting means 58 and 59, and the signal obtained by synthesizing the signals of the two systems is transmitted to the selecting means 63 and the D / A converters 64, 65 and 66. The output Y, PB, and PR signals ff, gg, and hh are output to a transmission line (not shown).

Next, a W-NT mode for reproducing one program of the NTSC signal at a tape running speed for a long time,
2N to reproduce 2 signals at standard tape running speed
The T mode will be described.

In the W-NT mode, the magnetic head 1
Only the system relating to A and 1B operates, while in the 2NT mode, the system relating to the magnetic heads 2A and 2B also operates. The TCI inverse converters 56 and 57 convert the signals obtained by expanding the time axis-compressed Y, PB and PR signals on the time axis, respectively, through the fifth and sixth selectors 58 and 59 and perform inverse conversion on the signals. 60, 61. Then, the inverse conversion means 60,
Selecting means 54, 5
At 5, the first and second output NTSC signals ii and jj obtained by inserting the information signals supplied from the generating means 52 and 53 into 19 lines of the composite video signal are passed through D / A converters 67 and 68. Output to a transmission line (not shown).

In this manner, in any of the W mode, W-NT mode, and 2NT mode, the magnetic tape TT on which a plurality of types of correction signals having a fixed relationship with the time code signal in the information signal are sequentially recorded is reproduced. Thus, a predetermined correction can be made.

Further, according to the recording / reproducing apparatus of the present embodiment, even when recording an HD signal in which an information signal is inserted into 603 lines, 10 out of the scanning lines of the HD signal are used.
An information signal can be recorded on a magnetic tape in spite of recording only 32 lines. When reproducing this magnetic tape, an HD signal obtained by inserting the information signal into 603 lines can be output. Therefore, there is an effect that the management of the amplitude level and the like can be easily performed by the high-definition equipment at the subsequent stage.

In the above-described embodiment, the dividing means 201 and the TCI dividing means 480 are used as an example for specifying the type of the correction signal from the time code signal. However, the present invention is not limited to this. Of course, it is only necessary to sequentially generate one correction signal from a plurality of types of correction signals based on the property of the time code signal that advances by one field or one frame.
To sequentially generate three types of correction signals from the three types of correction signals, a ROM having a first word in a time code signal representing field or frame information as an input signal may be used. In order to sequentially generate one type of correction signal from the signal, it is sufficient to specify the correction signal using the least significant bit of the first word.

In the above-described embodiment, the output signals of the correcting means 46 and 47 are used as the input signals of the TCI determining means 50 and 51 in order to determine the information signal from the corrected signal. It goes without saying that the output signals of 44 and 45 may be used as input signals. In the above-described embodiment, among a plurality of types of correction signals, a gray scale signal (for example, ternary) for adjusting a DC level and an amplitude level between two systems is more important than other correction signals. In consideration of the fact that the time code signal is a simple signal, the first control signal 2
This occurs when 01a is "0", and it goes without saying that recording may be always performed at the start of recording.

In the above-described embodiment, the video signal recording / reproducing apparatus is a VTR using a magnetic tape as a recording medium.
However, the present invention is not limited to this, and the recording medium may be a disk-shaped optical disk, a floppy disk, or the like, or may be a semiconductor memory. .

In the above-described embodiment, the video signal recording / reproducing apparatus has been described. However, the video signal recording apparatus according to the present invention may have at least a recording system. What is necessary is just to have a reproduction system at least.

[0060]

As described above, according to the configuration of the video signal recording apparatus of the present invention, in particular, correction signal generation means for appropriately generating one correction signal selected from a plurality of types of correction signals, An information signal generating means for generating an information signal indicating at least whether or not the one correction signal has been generated; and inserting the one correction signal and the information signal into predetermined lines of the plurality of recording signals to record on a recording medium. Recording means for recording,
Even when a plurality of types of correction signals are prepared, it is not necessary to record all of them, and it is necessary to record the correction signals according to grades such as broadcasting, business, and home use or high-grade models and popular models. There is an effect that the type can be appropriately set and the use efficiency of the recording medium can be increased.

According to the configuration of the video signal reproducing apparatus according to the present invention, as described above, particularly when the reproduced information signal indicates the recording of one correction signal, the characteristics of the reproduced video signal are changed. If the reproduced information signal does not indicate the recording of the one correction signal, the correction means does not correct the characteristics of the reproduced video signal. The characteristics of the video signal can be corrected only when the video signal is recorded. As a result, even if a plurality of types of correction signals are prepared, it is not necessary to record all of them, and the broadcast signal and the commercial signal can be used. There is an effect that the type of the correction signal can be appropriately set according to the grade of a home use or the like or a high-grade model, a popular model, or the like.

Further, as described above, according to the method of recording a video signal on a magnetic tape according to the present invention, the characteristic of the video signal is determined by the presence or absence of a correction signal at the time of reproduction, for broadcasting, business use, home use, or the like. Obtain a magnetic tape that records video signals that can be corrected as appropriate according to the glue of high-end models, popular models, etc.
There is an effect that can be.

[Brief description of the drawings]

FIG. 1 is a waveform diagram of an information signal.

FIG. 2 is a waveform chart for explaining a line of an information signal inserted into an HD signal.

FIG. 3 is a block diagram for explaining a main part of the video signal recording device according to one embodiment of the present invention.

FIG. 4 is a conceptual diagram for explaining the operation of a dividing unit.

FIG. 5 is a waveform diagram of a TCI signal.

FIG. 6 is a waveform chart for explaining the operation of the modulation means.

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

FIG. 8 is a tape pattern in a W mode.

FIG. 9 shows TC in W-NT mode and 2NT mode.
FIG. 3 is a waveform diagram of an I signal.

FIG. 10 shows tape patterns in the W-NT mode and the 2NT mode.

FIG. 11 is a block diagram for explaining a main part of a video signal reproducing apparatus according to one embodiment of the present invention.

Claims (3)

(57) [Claims] 1. A video signal recording apparatus for recording a plurality of recording signals obtained by dividing at least a plurality of video signals on a recording medium, and appropriately generating one correction signal selected from a plurality of types of correction signals. Correction signal generation means; information signal generation means for generating an information signal indicating at least whether or not the one correction signal is generated; and applying the one correction signal and the information signal to a predetermined line of the plurality of recording signals. Recording means for interposing and recording on a recording medium. 2. A recording medium on which a correction signal obtained by appropriately selecting from a plurality of types of correction signals and an information signal indicating at least the presence or absence of recording of the one correction signal are reproduced together with the video signal. A video signal reproducing device, wherein, when the reproduced information signal indicates the recording of the one correction signal, the characteristic of the reproduced video signal is corrected based on the one correction signal, and the reproduced A video signal reproducing apparatus comprising: a correction unit that does not correct the characteristics of the reproduced video signal when the information signal does not indicate recording of the one correction signal. 3. A plurality of recording signals obtained by dividing at least a plurality of video signals on a magnetic tape by a magnetic head.
A video signal recording method for forming a tilt track, and at least representative of the information signal to the presence or absence of the recording of a plurality of types of correction signals one obtained by appropriately selecting from the correction signal and the one of the correction signals, said plurality of and interposed in a predetermined line of the recording signal
Recording on magnetic tape , characterized in that
Video signal recording method .