JPH06343152A - Video signal recording device, reproducing device and magnetic tape - Google Patents

Abstract

PURPOSE:To record plural correction signals while improving the utilization efficiency of a recording medium. CONSTITUTION:This video signal recording device for recording first and second recording signals 18a and 19a obtained by dividing HD signals at least into halves to this magnetic tape TT is provided with a time code signal generation means 200 for generating time code signals 200a stepped for each frame of the HD signals, a correction signal generation means 21 for successively generating three kinds of the correction signals based on the time code signals 200a and a recording means for interposing TCI information signals 20a provided at least with the time code signals 200a and the correction signals 21a in the prescribed lines of the first and second recording signals 18a and 19a and recording them on the magnetic tape TT.

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 magnetic tape.

[0002]

2. Description of the Related Art Conventionally, as a method of high-density magnetic recording / reproducing, a segment recording system is known in which one screen is divided and recorded / reproduced on a plurality of tracks. This system has a plurality of systems of signal processing means because one screen is recorded and reproduced by a plurality of heads, but has a drawback that line flicker or field flicker occurs due to the difference in characteristics among these signal processing means. It was

Therefore, as a magnetic recording / reproducing apparatus that solves the above-mentioned drawbacks, "UNI", which is one of the high definition VTR systems.
HI "or high-definition VTR (" Hi-vision VTR for consumer use "Television Society Technical Report VOL.15 NO.50)
Is proposed. In order to solve the above-mentioned drawbacks in these conventional VTRs, a plurality of correction signals for correcting the characteristics between a plurality of systems of signal processing means are recorded at the beginning of a track formed on a magnetic tape, and these plurality of correction signals are reproduced at the time of reproduction. The correction signal of (1) is reproduced to correct the characteristics between the signal processing means of a plurality of systems.

[0004]

However, if a predetermined period is required to record a plurality of correction signals unrelated to the pattern, there is a drawback that the utilization efficiency of the recording medium is reduced. . If the kind of the correction signal is limited, the characteristics that can be corrected between the signal processing means are limited.

There are also cases where it is desired to appropriately set the type of the correction signal in accordance with the use such as broadcasting, business use, home use, etc., or the grade of high-end model or popular model.

Therefore, the present invention provides a video signal recording device, a magnetic tape, and a video signal reproducing device capable of improving the utilization efficiency of a recording medium, correcting a plurality of types of characteristics, and appropriately setting the types of correction signals. The purpose is to do.

[0007]

The present invention provides the following configurations in order 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 time code signal is generated which is stepped every field or frame of the video signal. Time code signal generating means, correction signal generating means for sequentially generating one correction signal selected from a plurality of types of correction signals based on the time code signal, an information signal having at least the time code signal, and the one A video signal recording device, comprising: a recording unit which inserts a correction signal into a predetermined line of the plurality of recording signals and records the recording signal on a recording medium.

In a video signal recording apparatus for recording on a recording medium a plurality of recording signals obtained by dividing a video signal into at least a plurality of times, a time code signal is generated which is stepped every field or frame of the video signal. One correction selected from R (R is a natural number and R ≦ Q) types of correction signals based on the remainder obtained by dividing the time code signal generation means and the time code signal by Q (Q is a natural number of 2 or more) Correction signal generating means for sequentially generating signals, an information signal having at least the time code signal, and a recording means for recording the one correction signal on a recording medium by inserting the plurality of recording signals in predetermined lines. A video signal recording device comprising:

An information signal having at least a time code signal stepped up for each field or frame of the video signal together with the video signal, and a plurality of kinds of correction signals are sequentially obtained based on the time code signal. The other correction signal is a video signal reproducing device for reproducing the recorded recording medium, and the correction control for specifying the type of the reproduced one correction signal based on the reproduced time code signal. A video signal reproducing apparatus comprising: means and a correcting means for correcting the characteristic of the reproduced video signal on the basis of the identification result of the correction control means.

Along with the video signal, an information signal having at least a time code signal which is stepped up for each field or frame of the video signal, and the time code signal are Q
A correction signal obtained by sequentially selecting R (R is a natural number and R ≦ Q) kinds of correction signals based on the remainder obtained by dividing by (Q is a natural number of 2 or more) And a type of the one correction signal reproduced from the R type correction signals based on a remainder obtained by dividing the reproduced time code signal by the Q. A video signal reproducing apparatus comprising: a correction control means and a correction means for correcting the characteristic of a reproduced video signal based on a specification result of the correction control means.

A magnetic tape in which a plurality of recording signals obtained by dividing at least a plurality of video signals are recorded by a magnetic head on a plurality of tracks formed in an oblique direction, and the magnetic tape is recorded for each field or frame of the video signals. An information signal having at least a stepped time code signal and one correction signal obtained by sequentially selecting a plurality of types of correction signals based on the time code signal are provided on a predetermined line of the plurality of recording signals. A magnetic tape characterized by being inserted.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a waveform diagram of an information signal, FIG. 2 is a waveform diagram for explaining lines of an information signal inserted in an HD signal,
3 is a block diagram for explaining a main part of a video signal recording apparatus according to an embodiment of the present invention, FIG. 4 is a conceptual diagram for explaining the operation of a dividing means, FIG. 5 is a waveform diagram of a TCI signal,
FIG. 6 is a flow chart for explaining the operation of the modulation means, FIG. 7 is a waveform diagram of the TCI information signal, FIG. 8 is a tape pattern in W mode, FIG. 9 is W-NT mode and 2N.
Waveform diagram of TCI signal in T mode, FIG.
FIG. 11 is a block diagram for explaining a main part of the video signal reproducing apparatus according to the embodiment of the present invention. This embodiment relates to a video signal recording / reproducing apparatus for recording / 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 and explain signals.

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

(Information Signal) FIGS. 1A and 1B show a luminance signal (hereinafter abbreviated as “Y signal”) relating to an HD signal or NT.
Each of the lines of the information signal inserted in the SC signal is illustrated. The contents of the information signal are, as shown in FIG. 6C, 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. A data signal (56 bits) indicating the type of data, a time code signal (32 bits) indicating time information, an error correction signal (16 bits) for error detection / correction during reproduction, and a level for managing the 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 has 20 IRE set to "0".
0IRE corresponds to "1".

The data signal is composed of 7 words in 8-bit units. The first word relates to the format of the video signal, and the aspect ratio information (for example, 16: 9,
4: 3), image display format information (eg, letterbox or normal identification), track format information (eg,
HD, NTSC, EDTV, etc.) and telecine information (for example, identification of the same frame).
In addition, the second word is the program I indicating the program number.
D information is stored. The third word is audio information (for example, identification of stereo, mono, bilingual, etc.), editing information (for example, identification of editing start, editing end, editing, etc.), correction signal information (for example, correction signal Identification of presence / absence) and control signal information (for example, identification of duty ratio of control signal such as VISS, VASS). The fourth and fifth words are text information and represent character information and the like by a so-called closed caption method. 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 the frame number that is incremented by one frame, and the second word is "second".
, The third word represents “minutes”, and the fourth word represents “hours”.

Next, the line on which the information signal is inserted is set to HD.
Signals and NTSC signals will be explained 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 the line numbers, and the first line starts from the start of the vertical sync signal of the odd field.

Here, the line through which the information signal is to be inserted is
Since the vertical blanking period and the horizontal synchronizing signal period including the vertical synchronizing signal may be deleted by the high-definition equipment, it is necessary to insert a level standard signal in the effective scanning line, and the information signal is not a pattern signal. , 8% to 1 for all scan lines so that they are not displayed on the monitor screen
It is necessary to consider that the monitor has a 0% overscan characteristic.

Therefore, 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
It becomes one line or a plurality of lines from the lines and 1095 to 1120 lines. By the way, since the number of scanning lines that the monitor overscans actually varies from device to device, it is more preferable to insert an information signal into a scanning line that is an effective scanning line and is unlikely to appear on the screen. desirable. Also, in the HD signal of the studio standard, there are 1035 effective scanning lines, and the effective picture period is 41 lines to 557 lines and 603 lines to 112 lines.
It is line 0. On the other hand, in the MUSE decoder output signal, there are 1032 effective scanning lines, and the effective picture period is 42 lines to 557 lines and 604 lines to 1119.
It is a line.

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

Further, the 41st line and the 603th line are effective scanning lines for HD signals of the studio standard, and M
This is a line which 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 in the 41 line and / or the 603 line.

Therefore, the video signal magnetic recording / reproducing apparatus according to the present embodiment outputs the information signal by inserting it into the 603 line of the HD signal, and considering the MUSE decoder output signal as the input HD signal, the 603 line or 604 line. It is assumed that the information signal is inserted.

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

(Recording system) HD signal or NT using FIG.
To explain the recording system of a video signal recording / reproducing apparatus for recording / reproducing an SC signal, this video signal recording / reproducing apparatus records the HD signal at a standard tape running speed in the W mode and the NTSC signal at a long tape running speed for 1 Program recording W-
NT mode and NTSC signal at standard tape running speed 2
There is a 2NT mode for program recording.

First, in order to explain the W mode, in the figure, the input Y signal aa (luminance signal) and the input PB, PR signals bb and cc (color signal) are AG from a transmission line (not shown).
It is supplied to the C means 1 to 3, respectively. Here, input Y, P
The B and PR signals are signals conforming to the domestic high-definition signal standard, and are signals converted from the R, G and B signals by the following formula.

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 AGC means 1 to 3 are A / D conversion. The amplitude level of each signal is corrected based on the level reference signal in the information signal related to the output signal 4a of the output device 4. When the level reference signal is inserted in the 603 line, this is given the highest priority, If the level reference signal is not inserted in the 603 line and the level reference signal is inserted in the 604 line, the level reference signal is used to detect the 603 line and the 60
If the level reference signal is not inserted in any of the four lines, the level is corrected based on the amplitude level of the horizontal synchronizing signal.

Then, the input Y, PB, PR signals aa, bb, cc having the normal amplitude level are converted into A / D converters 4.
Through 6 to the dividing means 7. The dividing means 7 is an A / D converter for input Y, PB, PR signals aa, bb, cc.
It plays a role of dividing the output signals of the converters 4 to 6 into two systems. This division process will be described with reference to FIG. 4. The input Y, PB, PR signals aa, bb, cc shown in the upper left part of FIG.
The number of effective scanning lines of the MUSE signal (1032) obtained by deleting the synchronizing signal and the lines relating to the upper and lower sides of the screen from the (HD signal)
This signal is generated, and this signal is divided into the two systems of signals shown in the lower left and lower right of FIG. The first Y, PB, PR signals 7a, 7b, obtained by dividing in this way,
7c and the second Y, PB and PR signals 7d, 7e and 7f are supplied to the first and second selecting means 8 and 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. In the W mode, the first Y and P are selected.
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 conversion means 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
Selectively output to. Further, in the 2NT mode, the third Y, PB, PR signals 15a, 15b, 15c and the fourth Y, PB, PR signals 15a, 15b, 15c are first and
Selectively output to the second TCI conversion means 16 and 17, respectively.
Since only one system is required for W-NT mode,
The second selection means 9 does not output any input signal.

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

Then, the third and fourth selecting means 18, 19
Is the first and second TCI signals 16a and 17a related to the design.
, The TCI information signal 20a, the correction signal 21a, and the blanking signal 22a are selected to display the first and second signals shown in FIG.
Recording signals 18a and 19a are generated. That is, in the period T1 shown in the figure, the first and second TCI signals 16
a and 17a are selected, and the blanking signal 2 is set in the period T2.
2a is selected, the TCI information signal 20a is selected in the period T3, and the correction signal 21a is selected in the period T8. still,
The signal indicated by "SW" in FIG. 5 is a switching signal that secures a margin for switching the magnetic head,
The signal indicated by "V" is a vertical synchronizing signal, and "DA"
The signal shown by is the information signal, and the signal shown by "CAL" is the 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 is composed of a counter or the like,
When the recording of the input HD signal is started, the counter is reset to "0", the count value is incremented (stepped) every time one field or one frame is recorded, and the time composed of 4 words in units of 8 bits described above. The code signal 200a is obtained, and this signal is supplied to the dividing means 201 and the error correction signal generating means 204.

The dividing means 201 plays a role of specifying the relationship between the time code signal 200a and the kind of the correction signal 21a described later. Here, it is preferable that the number of types of the correction signal 21a is large in view of correcting various characteristics, but since the configuration becomes complicated as the number of types increases, the use for broadcasting, business use, home use, etc. or a high-grade model. ，
It is convenient to be able to set the type according to the grade of popular models. In addition, it is necessary to ensure expandability so that a correction signal that is not currently assumed can be used in the future. Therefore, the maximum types of correction signals including future possibilities are Q types (Q is a natural number of 2 or more), and the types of correction signals actually used are 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 generating means 2 is used.
02 and the selection means 214 in the correction signal generation means 21. In the present embodiment, the following description will be made assuming that Q = 5.

The data signal generating means 202 is supplied with the first control signal 201a and the information signal in the output signal 4a of the A / D converter 4, and the latter has a predetermined level (for example, the maximum level of the horizontal synchronizing signal). ) Is used as a threshold value to identify the information signal, and error correction / detection processing is performed, and the changed data such as program ID information, editing information, and correction signal information is replaced with new information to obtain a data signal 202a. It is supplied to the error correction signal generating means 204. As described above, the correction signal information is for identifying the presence / absence of the correction signal. Three kinds of correction signals are prepared by the correction signal generating means 21 described later, and the first control signal 201a is "0".
Assuming that the above three types of correction signals are generated corresponding to "1" and "2", the first control signal 201a is "3".
When "4" is represented, the correction signal 21a is not recorded, so the correction signal information is "0" indicating that there is 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 that there is a correction signal. When the information signal is not inserted in the 603 line or the 604 line (for example, when the broadcast HD signal is recorded), the data signal 202a
The data signal 202a is generated on the basis of the output of the not-shown discriminating means for discriminating the information necessary for generating the data signal such as the type classification of the video signal and the audio signal.

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

Then, the modulating means 206 converts the input signal represented by two values into three values, so that the emphasis means 25 and 26, which will be described later, emphasize the high frequency components, and immediately after the edge generated. The spike level is reduced so as not to exceed the limiter level limited by the limiter means 27, 28 for preventing overmodulation.
As will be specifically described with reference to FIG. 6, FIG. 6A shows a clock signal, and six cycles thereof are shown in FIG.
It corresponds to 1 bit of the input signal shown in FIG. Then, as shown in FIG. 7C, when the input signal changes from "1" to "0" and the bit is currently "0", 50, 20, 20, 20, When the bits of "0" are continuous, such as 20,20IRE, the input signal is changed from "0" to "1" so that it becomes 20,20,20,20,20,20IRE for each sample of the clock signal. If the bit is changed to “1” and is currently “1”, then 50,80,80,80,8 for each sample of the clock signal
0,80IRE, 80,80,80,80,80,80IRE for each sample of the clock signal when the bit of "1" is continuous.
Modulate so that The output signal of the modulation means 206 thus obtained is used as the emphasis means 25, which will be described later.
At the output of 26, the signal shown in FIG. 6D is obtained, and since it does not exceed the limiter level, the limiter means 27,
At 28, edge information is not lost.

The output signal of the modulation means 206 is supplied to the selection means 207, where the normal reference level (50 IRE) supplied from the level reference signal generation means 203.
The time-division multiplexed level reference signal having the above and a synchronization signal or the like supplied from a synchronization signal generating means (not shown) are obtained to obtain the TCI information signal 20a shown in FIG. The information signal inserted in the 603 line or 604 line of the Y signal aa is time-axis compressed during the period t1 in the figure. 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 also possible to deal with the case where an information signal is inserted in the PB and PR signals bb and cc.

The correction signal generating means 21 is composed of first to third ROMs 210 to 212 storing different first to third correction signals 210a, 211a and 212a and a selecting means 213, respectively. The first to third correction signals 210a, 211a, 212a are transferred to the first control signal 20.
Based on 1a, the selection means 213 selectively outputs the correction signal 21a. That is, when the first control signal 201a represents "0", "1", and "2", the first to third correction signals 210a, 211a, and 212a are selected, and the first control signal 201a is "3". When "4" is represented, a blank signal composed of a synchronization signal and a pedestal level output from a ROM (not shown) is selected. The first to third correction signals 210a, 211a, 212a are, for example, a ramp signal for correcting the linearity between the two systems, a grayscale signal for adjusting the DC level and the amplitude level between the two systems, and A multi-burst signal for correcting frequency characteristics between systems, a 2T pulse signal for correcting phase characteristics between systems (a cycle of a frequency whose half width in the form of SIN2 is equivalent to 1/2 of the band, (Matches) etc.

Further, the blanking signal generating means 22 is R
A blanking signal 22a, which is composed of an OM or the like, and which is composed of the above-mentioned switching signal and vertical synchronizing signal.
(Interpolated during period T2 in FIG. 5) is output.

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

The emphasis means 25 and 26 emphasize the high frequency components in the horizontal direction. Then, the output signals of the emphasis means 25 and 26 are set to the limiter means 2
After the amplitude is limited by 7, 28, FM modulating means 29, 3
At 0, a signal which can be modulated by a 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, respectively. 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 one is represented.

Then, the first recording TCI signal 18a relating to the even-numbered line is output from "SW" to "556 (1) shown in FIG. 8A by using the magnetic head 1A arranged on the rotating drum. / 2) ”, and the magnetic head 1B is used to record“ 5 ”shown in FIG. 8 (A).
It is recorded on the tracks from "56 (1/2)" to "1118". On the other hand, the second recording T related to the odd-numbered line
The CI signal 19a is output from "SW" to "5" shown in FIG. 8A by using the magnetic head 2A arranged on the rotating drum.
57 (1/2) ”, and the magnetic head 2B is used to record“ 557 ”shown in FIG. 8A.
(1/2) ”to“ 1119 ”are recorded. In addition, the magnetic heads 1A arranged close to each other,
2A or magnetic heads 1B and 2B perform simultaneous recording,
Audio magnetic heads 3A and 3B preceding this (not shown)
Thus, audio tracks A and B in FIG. 8A are formed. Of course, the magnetic tape pattern shown in FIG. 8B can be obtained by appropriately setting the mounting heights of the magnetic heads 1A, 2A, 1B and 2B and the audio magnetic heads 3A and 3B.

Now, the W-NT mode for recording one program of the NTSC signal at the tape running speed for a long time and the N-mode
The 2NT mode in which two programs of the TSC signal are recorded 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 recorded on each track shown in FIG.
In the T mode, the NTSC signal for one field is subjected to a predetermined process and recorded for each program on each track relating to the video signal shown in FIG. 8 at the standard tape running speed.

In FIG. 3, the transmission line (not shown)
The second NTSC signals dd and ee are the AGC means 12, 13
The amplitude level is corrected based on the level reference signal in the information signal relating to the output signals of the A / D converters 12 and 13 and then the first and second signals are supplied via the A / D converters 12 and 13. The second NTSC signals dd and ee are converted into conversion means 14 and 1.
5 is supplied. The conversion means 14 and 15 are the 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 the first and second selecting means 8 and 9. In the W-NT mode, the second NTSC signal ee
The configuration according to does not work.

Then, the third Y, PB, PR signals 14a, 14b, 14c and the fourth Y, PB, PR signals 15a, 15b, 15c are selected by the first and second selecting means 8, 9. And supplied to the first and second TCI conversion means 16 and 17, respectively. In the case of the above HD signal, PB,
The PR signal was subjected to the line-sequential processing, but in the case of the NTSC signal, the line-sequential processing is not performed because the number of scanning lines is small.
PB, PR signals 14b, 14c and fourth PB, PR
Signals 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 time-axis multiplexed to perform first and second TCI.
The signals 16a and 17a are obtained.

Then, the first and second TCI signals 16
a, 17a, the TCI information signal 20a, the correction signal 21a, and the blanking signal 22a, the third and fourth selecting means 1
8 and 19 are selected to obtain the first and second recording signals 18a and 19a shown in FIGS. Also,
The magnetic tape pattern on which the first and second recording signals 18a and 19a are recorded is as shown in FIG. Incidentally, FIG. 6B shows a magnetic tape pattern in the W-NT mode.

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

(Playback System) The playback system will be described from the W mode with reference to FIG. In the figure, the magnetic tape TT
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), and then F is demodulated by the FM demodulation means 40 and 41.
M demodulation is performed. Then, after the output signal is attenuated by the de-emphasis means 42, 43 having a complementary relationship with the emphasis means 25, 26, the high frequency components in the horizontal direction are attenuated, and then passed through the A / D converters 44, 45. The obtained first and second reproduction signals 44a and 45a are corrected by the correction means 46 and 4.
7 is supplied.

The correction means 46 and 47 have the above-mentioned correction signal 2
Second control signals 48a and 49, which will be described later, indicating the type of 0a.
The first and second reproduction 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 sufficient to support a predetermined correction signal depending on the application or grade. In order to perform the correction corresponding to the above-mentioned first to third correction signals 210a, 211a, 212a, for example, instead of the first control signal 201a, the second control signal 48 is supplied to the above-mentioned correction signal generating means 21.
a, 49a are supplied to generate a normal correction signal, and the normal correction signal and the reproduced correction signal are level-compared by a comparison means (not shown), based on the difference It is sufficient to correct the two reproduced signals 44a and 45a.
The output signals of the correction means 46 and 47 are output to the TCI discrimination means 50 and 51 and the first and second TCI inverse conversion means 56 and.
57. Needless to say, the type of the correction signal generated in the recording system and the type of the correction signal used in the reproducing system do not have to match in one video signal recording / reproducing apparatus.

The TCI discriminating means 50, 51 holds the level of the reproduced TCI information signal 20a of "0" or "1" for the period t2 or t3 in FIG. Discrimination signals 50a, 5 which are used as threshold values and have level information for level reference signals.
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 both have the same configuration, the composition control means 48 will be described in detail. The discrimination signal 50a is supplied to the TCI division means 480, and like the division means 201 described above, a signal representing the remainder obtained by dividing the time code related to the time code signal in the discrimination signal 50a by “Q = 5” is selected. Supply to the means 483. The selecting means 483 plays a role of excluding the output signal of the TCI dividing means 480 which is inappropriate as the second control signal 48a, and does not operate when the correction signal is not recorded or the information signal is incorrect. Exclude from the control signal 48a as deemed appropriate. That is, the error detecting means 481 detects an error in the information signal using the above-mentioned error correction signal, and if there is an error, "0".
If is correct, “1” is supplied to the selection means 483.
Further, the correction signal information discriminating means 482 extracts the correction signal information from the information signal, and selects “1” when the correction signal is not inserted and “1” when the correction signal is inserted.
Supply to 3. Then, both of the selecting means 483 are "1".
Only in this case, the second control signal 48a is supplied to the correction means 46.

Further, the generating means 52 extends the time axis of the discrimination signal 50a to generate an information signal and supplies it to the selecting means 63. Then, the selecting means 63 inserts the information signal in the line 603 of the Y signal. The generating 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 above-mentioned first and second TCI conversion means 16 and 17, and extend the compressed luminance signal and the compressed line-sequential color signal on the time axis and at the same time output the line-sequential color signal. Demodulate and reproduce the first reproduction Y, PB, PR signals 56
a, 56b, 56c and second reproduction Y, PB, PR signal 5
7a, 57b, 57c and these signals are
The signal obtained by synthesizing the signals relating to both systems is supplied to the synthesizing means 62 via the sixth selecting means 58 and 59, and is sent to the selecting means 63 and the D / A converters 64, 65 and 66. The output Y, PB, PR signals ff, gg, hh are output to a transmission line (not shown).

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

In the W-NT mode, the magnetic head 1
Only the systems related to A and 1B operate, while the systems related to the magnetic heads 2A and 2B also operate in the 2NT mode. Then, the TCI inverse transforming means 56 and 57 perform inverse transforming means on the signals obtained by expanding the time-axis compressed Y, PB and PR signals respectively on the time axis through the fifth and sixth selecting means 58 and 59. Supply to 60 and 61. And the inverse conversion means 60,
The composite video signal generated and obtained at 61 is selected by the selecting means 54, 5.
5, the first and second output NTSC signals ii, jj obtained by inserting the information signals supplied from the generating means 52,53 into the 19th line of the composite video signal are passed through the D / A converters 67,68. Is output to a transmission line (not shown).

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

Further, according to the recording / reproducing apparatus of the present embodiment, even when the HD signal in which the information signal is inserted in the 603 line is recorded, 10 of the scanning lines of the HD signal are recorded.
There is an effect that an information signal can be recorded on a magnetic tape despite recording only 32 lines, and 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 amplitude level can be easily managed by the high-definition device in the subsequent stage.

In the above embodiment, the dividing means 201 and the TCI dividing means 408 are used as an example for specifying the type of the correction signal from the time code signal, but 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 it advances in every one field or one frame.
In order to sequentially generate the three types of correction signals from the types of correction signals, a ROM that uses the first word in the time code signal representing the field or frame information as an input signal may be used. For example, two types of correction signals may be used. In order to sequentially generate one type of correction signal from the signal, it is sufficient to specify it by the least significant bit of the first word.

In the above embodiment, the output signals of the correction means 46 and 47 are used as the input signals of the TCI determination means 50 and 51 in order to discriminate the information signal from the corrected signal, but the A / D converter is used. Of course, the output signals of 44 and 45 may be used as the input signals. In the above-described embodiment, among a plurality of types of correction signals, the grayscale signal (for example, ternary value) for adjusting the DC level and the amplitude level between the two systems is particularly important as compared with other correction signals. In consideration of the fact that the time code signal is a signal, the first control signal 2
It is needless to say that the error occurs when 01a is "0", and it may be always recorded at the start of recording.

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

Although the video signal recording / reproducing apparatus has been described in the above embodiments, the video signal recording apparatus according to the present invention may have at least a recording system. At least a reproduction system is required.

[0062]

As described above, according to the configuration of the video signal recording apparatus of the present invention, in particular, the correction signal generation for sequentially generating one correction signal selected from a plurality of types of correction signals based on the time code signal is performed. A plurality of types of correction signals, and an information signal having at least the time code signal, and a recording means for inserting one correction signal into a predetermined line of the plurality of recording signals and recording the same on a recording medium. Even when recording, it is not necessary to specially record an identification signal for identifying that type, the use efficiency of the recording medium can be improved, and a plurality of types of correction signals can be sequentially recorded and reproduced. There is an effect that a recording medium capable of correcting a plurality of characteristics can be provided at times.

Further, as described above, according to the configuration of the video signal recording apparatus of the present invention, in particular R (R) is obtained based on the remainder obtained by dividing the time code signal by Q (Q is a natural number of 2 or more). Has a correction signal generating means for sequentially generating one correction signal selected from natural number and R ≦ Q) types of correction signals, so that it can be used for broadcasting, professional use, home use, etc., or high grade model, popular model grade, etc. There is an effect that the type of the correction signal can be appropriately set according to the above.

Further, according to the configuration of the video signal reproducing apparatus according to the present invention as described above, the correction control means for specifying the kind of the reproduced one correction signal based on the reproduced time code signal, Since there is a correction means for correcting the characteristics of the reproduced video signal based on the identification result of the correction control means, even if an identification signal for identifying the type of the correction signal is not recorded, one correction signal Since it is possible to specify the type, it is possible to correct a plurality of characteristics of the reproduced video signal based on a plurality of kinds of correction signals.

Further, as described above, according to the configuration of the video signal reproducing apparatus of the present invention, R (based on the remainder obtained by dividing the reproduced time code signal by Q (Q is a natural number of 2 or more). Since R has a correction control means for specifying the type of one correction signal reproduced from the correction signals of natural number and R ≦ Q), it is used for broadcasting, business, home use, etc. or high-end model, popular model, etc. There is an effect that the type of the correction signal can be appropriately set according to the grade.

Further, as described above, according to the structure of the magnetic tape of the present invention, the utilization efficiency is high and a plurality of characteristics can be corrected at the time of reproduction.

[Brief description of drawings]

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 in an HD signal.

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

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

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

FIG. 6 is a flowchart 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 W mode.

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

FIG. 10 is a tape pattern in 2NT mode.

FIG. 11 is a block diagram illustrating a main part of a video signal reproducing device according to an embodiment of the present invention.

[Explanation of symbols]

21 correction signal generation means 48, 49 correction control means 46, 47 correction means 200 time code signal generation means 18a, 19a first and second recording signals (plural recording signals) 20a TCI information signal (information signal) 21a correction signal 200a time code signal aa, bb, cc input Y, PB, PR signal (video signal) TT magnetic tape (recording medium)

Claims (5)

[Claims] 1. A video signal recording apparatus for recording a plurality of recording signals obtained by dividing a video signal into at least a plurality of pieces on a recording medium, wherein a time code signal which is stepped up for each field or frame of the video signal is used. A time code signal generating means for generating, a correction signal generating means for sequentially generating one correction signal selected from a plurality of types of correction signals based on the time code signal, an information signal having at least the time code signal, A video signal recording apparatus, comprising: a recording unit that inserts one correction signal into a predetermined line of the plurality of recording signals and records the recording signal on a recording medium. 2. A video signal recording apparatus for recording a plurality of recording signals obtained by dividing a video signal into at least a plurality of pieces on a recording medium, wherein a time code signal which is stepped up for each field or one frame of the video signal is used. A time code signal generating means to be generated and one of R (R is a natural number and R ≦ Q) kinds of correction signals selected based on the remainder obtained by dividing the time code signal by Q (Q is a natural number of 2 or more). A correction signal generating means for sequentially generating the correction signals, an information signal having at least the time code signal, and the one correction signal, which are inserted into predetermined lines of the plurality of recording signals and recorded on a recording medium. And a video signal recording device. 3. An information signal having at least a time code signal stepped up for each field or frame of the video signal together with the video signal, and a plurality of kinds of correction signals are sequentially selected based on the time code signal. The one correction signal thus obtained is a video signal reproducing device for reproducing the recorded recording medium, and specifies the type of the one correction signal reproduced based on the reproduced time code signal. An image signal reproducing apparatus comprising: a correction control unit; and a correction unit that corrects a characteristic of a reproduced video signal based on a specification result of the correction control unit. 4. An information signal having at least a time code signal stepped up for each field or frame of the video signal together with the video signal, and the time code signal is Q.
A correction signal obtained by sequentially selecting R (R is a natural number and R ≦ Q) kinds of correction signals based on the remainder obtained by dividing by (Q is a natural number of 2 or more) And a type of the one correction signal reproduced from the R kinds of correction signals based on a remainder obtained by dividing the reproduced time code signal by the Q. An image signal reproducing apparatus comprising: a correction control unit; and a correction unit that corrects a characteristic of a reproduced video signal based on a specification result of the correction control unit. 5. A magnetic tape in which a plurality of recording signals obtained by dividing at least a plurality of video signals are recorded on a plurality of tracks formed in an oblique direction by a magnetic head, and one field or one frame of the video signals. An information signal having at least a time code signal stepped up every time, and one correction signal obtained by sequentially selecting a plurality of kinds of correction signals based on the time code signal are defined as predetermined ones of the plurality of recording signals. A magnetic tape characterized by being inserted in a line.