JP3019903B2 - Video signal recording system - 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 system, and is suitable for a video signal recording system for recording a high-definition video signal compatible with a conventional magnetic reproducing apparatus for reproducing a video signal. It is.

[0002]

2. Description of the Related Art FIG. 6 is a block diagram for explaining a conventional magnetic recording apparatus, and FIG. Hereinafter, a conventional technique will be described with reference to the drawings.

Conventionally, a small cassette high-definition VTR (UNIHI system) has been known as a magnetic recording / reproducing apparatus for recording and reproducing high-definition video signals such as high-vision signals. The magnetic recording apparatus will be described with reference to FIG. 6. In FIG. 6, an input Y signal aa (luminance signal), an input PB, an input PR signal bb, and a cc (color signal) are transmitted from a transmission line (not shown).
Is supplied to the TCI conversion means 4 via the A / D converters 1 to 3. Here, the input Y, input PB, and input PR signals are signals compliant with the domestic Hi-Vision signal standard, and are signals converted from 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) After converting the signal into a line-sequential color signal, the signal is subjected to time-axis compression, and the TCI obtained by time-division multiplexing this with the time-axis-compressed Y signal.
The signal is supplied to shuffling means 5. The shuffling means 5 changes the order of the TCI signals corresponding to the scanning lines in accordance with a predetermined rule in consideration of dropout during reproduction and the like. Then, the output signal of the shuffling means 5 is divided into two by the dividing means 6, and the time axis is doubled to halve the bandwidth of the output signal. The signals are supplied to magnetic heads P1 and P2 and magnetic heads Q1 and Q2 via FM modulation means 9 and 10, respectively. The signal for one field period is divided into two parts on the magnetic tape T, and two tracks formed on the magnetic tape T are separately recorded.

Next, a conventional magnetic reproducing apparatus for reproducing a high-definition video signal such as a Hi-Vision signal will be described with reference to FIG. P2 and magnetic heads Q1, Q
2 and the signals demodulated by FM demodulation means 11 and 12 and A
The signals are supplied to the synthesizing means 15 via the / D converters 13 and 14. The synthesizing means 15 has a complementary relationship with the dividing means 6, and supplies a signal obtained by synthesizing two input signals to the deshuffling means 16, where the scanning lines are exchanged and the same as the TCI signal. Are returned to the order of the scanning lines.
Then, the output signal of the deshuffling means 16 is set to TC
The output Y signal dd, output PB, and output PR obtained by extending the time axis and line-sequentially demodulating the color signal by the I inverse conversion means 17.
The signals ee and ff are output to a transmission line (not shown).

In this manner, a high-definition signal can be recorded and reproduced in a small cassette high-definition VTR (UNIHI system).

[0007]

However, when the current NTSC system and the Hi-Vision system are used in parallel, if there is a VTR corresponding to each system, it is inflexible and inconvenient for each other. . That is, a conventional high-vision VTR and an NTSC VTR cannot use a pre-recorded tape mutually, and furthermore, a tape obtained by the conventional high-vision VTR can be used for the NTSC VTR to obtain the current video. There is a disadvantage that it cannot be reproduced as a signal.

[0008]

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

[0009] The first and second divided video signals obtained by dividing a high-definition video signal having a wider bandwidth than the conventional video signal into two and extending the time axis approximately twice are divided into first and second divided video signals on a magnetic recording medium. The pseudo video signal is recorded on the second track, and the high definition video signal is subjected to a scanning line number conversion process and converted to have the signal standard of the conventional video signal. A video signal recording method wherein recording is performed on a third track adjacent to the first and second tracks for each field in a recording method.

[0010] The first and second divided video signals obtained by dividing a high-definition video signal having a wider bandwidth than the conventional video signal into two and extending the time axis approximately twice are divided into first and second divided video signals on a magnetic recording medium. The pseudo video signal is recorded on the second track, and the high definition video signal is subjected to a scanning line number conversion process and converted to have the signal standard of the conventional video signal. A video signal recording method for recording on a third track adjacent to the first and second tracks for each field in a recording method, wherein the first and third tracks on a first track to a third track are recorded. A video signal recording system, wherein the distances of two divided video signals and the pseudo video signal in one horizontal scanning period are equalized.

[0011]

FIG. 1 is a block diagram for explaining a main part of a magnetic recording apparatus according to an embodiment of the present invention, and FIG. 2 is a plan view for explaining an arrangement of a magnetic head provided on a rotary drum. FIG. 3 is a view for explaining a tape pattern, FIG. 4 is a conceptual view for explaining the length of 1H, and FIG. 5 is a view for explaining a main part of a magnetic reproducing apparatus according to an embodiment of the present invention. It is a block diagram. Hereinafter, embodiments will be described with reference to the drawings.

In FIG. 1, an input Y is input from a transmission line (not shown).
The signal aa and the input PB and the input PR signals bb and cc are A /
The data is supplied to the dividing means 24 via the D converters 21 to 23. This dividing means 24 is different from the above-described dividing means 4 in that it not only divides an input signal into two, but also divides a scanning line and then divides it into two systems.

To explain this point in detail, the input Y signal a
The number of scanning lines a is 1125 lines / frame (562.5 lines /
Field), of which the number of effective scanning lines for transmitting image information is 1035 lines / frame (517.5 lines / field). Therefore, the number of effective scanning lines is 103
5 / frame is completely transmitted, and a Y signal of 1050 lines / frame (525 lines / field) obtained by thinning out a vertical blanking period in which image information is not transmitted is divided into two,
Further, the time axis is extended by a factor of approximately two to provide signals of 525 lines / frame (262.5 lines / field).

The input PB and the input PR signals bb and cc are similarly divided. Also, the input Y signal aa
Is 1035 lines / frame, but the MU
In view of the fact that the signal obtained by decoding the SE signal has 1032 lines / frame and that several upper and lower lines of 1035 lines / frame are not displayed on the monitor screen,
1032 lines / frame out of 1125 lines / frame of the input video signal are regarded as the number of effective scanning lines, which are completely included, and Y of 1050 lines / frame (525 lines / field) obtained by thinning out other parts. The signal is divided into two parts, 52
Of course, a signal of 5 lines / frame (262.5 lines / field) may be used.

The first Y, PB, and PR signals 24a, 24b, and 24c and the second Y, PB, and PR signals 24d, 24e, and 24f obtained as described above are divided into two systems.
It is supplied to the first and second recording processing means AA and BB, respectively. Here, since both have the same configuration, the description of the second recording processing means BB will be omitted.

The first PB and PR signals 24b and 24c are supplied to a line-sequential conversion means 25 in the first recording processing means AA. Here, a signal obtained by alternately thinning both signals every other scanning line is obtained. TCI conversion means 2 converts the line-sequential color signal obtained by combining
6. The TCI conversion means 26 compresses the line-sequential color signal and the first Y signal on a time axis basis for each 1H and multiplexes the time axis on a 1H basis to obtain a TCI signal, which is obtained by a D / A converter (not shown). Is supplied to the FM modulating means 27 via the. FM modulation means 27 obtained by subjecting the TCI signal to FM modulation with a deviation of 8.5 MHz to 11 MHz.
Are supplied to the magnetic heads A1 and A2, and are recorded on a predetermined track on the magnetic tape T, which will be described later. Similarly, a signal output from the second recording processing means BB is recorded on the magnetic tape T by the magnetic heads B1 and B2. The magnetic tape T is preferably, for example, a metal tape in consideration of the band of a signal to be recorded.

On the other hand, the input Y signal aa supplied to the scanning line number conversion means 28 is 1125 lines / frame (562.5
(Line / field) is converted to a signal of 525 lines / frame (262.5 lines / field) by thinning out the scanning lines. At this time, the effective scanning lines may be simply thinned out, but it is a matter of course that any signal obtained based on the effective scanning lines, such as averaging the signals of the upper and lower lines, may be used.

Further, 525 lines / frame (262.5 lines / field) of the converted signal are converted so as to have a synchronization signal conforming to the NTSC signal standard. That is, the horizontal synchronizing signal, the vertical synchronizing signal, the blanking period, the equalizing pulse and the like have the NTSC signal standard. Further, scanning lines are similarly thinned out for the input PB and PR signals bb and cc.

In this way, each signal output from the scanning line number conversion means 28 becomes a signal having the same number of scanning lines as the signal output from the division means 24 described above. For this reason, the length of 1H formed on the magnetic tape T, which will be described later, is equal to the length of the two tracks for the HDTV signal and the pseudo NTS.
This matches with one track for C.

Then, the recording pseudo Y signal 28a output from the scanning line number conversion means 28 is supplied to a VHS / FM modulation means 34 via a D / A converter 29.
FM from 4MHz to 4.4MHz as deviation
The modulated signal is supplied to one input of the adding means 35.

On the other hand, the recording pseudo PB and PR signals 28b and 28c output from the scanning line number conversion means 28 are supplied to the quadrature two-phase modulation means 32 via D / A converters 30 and 31, and both input signals are output. The carrier color signal obtained by quadrature two-phase modulation of
It is supplied to the HS recording color processing means 33. The VHS recording color processing means 33 converts the carrier color signal into a low-frequency signal,
The low-frequency conversion color signal that has been subjected to the PS processing adopted in the HS system is supplied to the other input of the adding means 35. A signal obtained by frequency-multiplexing both input signals by the adding means 35 is recorded on the magnetic tape T using the magnetic heads C1 and C2. As a result, recording by the magnetic heads C1 and C2 is performed by the VHS system, which is a conventional video signal recording system.

Here, the arrangement of the magnetic heads arranged on the rotating drum will be described with reference to FIG. In the figure, magnetic heads A1, B1, C1 and 180 having positive azimuth angles are shown.
Magnetic head A having a negative azimuth angle at a position opposing the angle
2, B2 and C2 are provided respectively. The azimuth angle of the magnetic heads A1 and B1 for the two-part recording is +15.
° and the azimuth angles of the magnetic heads A2 and B2 are -15 °. Also, a magnetic head C for recording a pseudo NTSC signal
The azimuth angles of 1 and C2 are + 6 ° and -6 °, respectively. The magnetic head thus arranged forms a predetermined track in the illustrated drum rotation direction. That is, C1
(+ 6 °), A2 (-15 °), B1 (+ 15 °), C
Tracks are formed in the order of 2 (−6 °), A1 (+ 15 °), and B2 (−15 °).

Next, the tape pattern will be described with reference to FIG. A plurality of tracks are respectively formed by magnetic heads corresponding to the symbols shown in parentheses in FIG. That is, in the first field, a pseudo NTSC signal obtained by converting a Hi-Vision signal is pre-recorded by the magnetic head C1 with a track width of 25 μm, and a TCI signal obtained by dividing the Hi-Vision signal into two is followed by the magnetic heads A2 and B1. Each is recorded at 17 μm, and the second field is similarly recorded. The track width may of course be evenly set to 19 μm.

Thus, each track is formed, and the length of 1H will be described with reference to FIG. In the figure, the distance (horizontal in one horizontal scanning period) LH between the horizontal synchronizing signals shown by the thick line is the same between the tracks. This is because 262.5H is recorded for each track at an angle corresponding to 180 degrees on the magnetic tape wound on the rotating drum.

The track for the pseudo NTSC is VHS
Recording is performed by the (registered trademark) system, and various conditions such as a magnetic tape speed, a drum diameter, a drum rotation speed, and a still angle are set in the tape pattern so as to establish the VHS system. On the other hand, in the two-division recording of the high-definition signal, the recording is performed with these conditions. Therefore, it is possible to easily obtain a tape pattern in H arrangement in which the position of the horizontal synchronization signal of an adjacent track obtained by VHS recording is arranged perpendicular to the track. As a result, variable-speed reproduction can be easily performed, and crosstalk between adjacent tracks can be prevented.

Next, a magnetic reproducing apparatus will be described with reference to FIG. In the figure, signals reproduced by the magnetic heads A1 and A2 and the magnetic heads B1 and B2 are
The signals are supplied to the second reproduction processing means CC and DD, respectively. Here, since both have the same configuration, the description of the second reproduction processing means DD is omitted.

The signals reproduced by the magnetic heads A1 and A2 by the FM demodulation means 36 in the first reproduction processing means CC are demodulated into TCI signals. Then, the TCI signal is supplied to the TCI reverse conversion means 37 via an A / D converter (not shown). The TCI inverse conversion means 37 has a complementary relationship with the TCI conversion means 26. The TCI inverse conversion means 37 expands the compressed Y signal and the compressed line-sequential color signal in the TCI signal on the time axis, and performs line-sequential combining with the synthesizing means 39. It is supplied to the inverse conversion means 38. Then, the line-sequential inverse conversion means 38 generates two types of color difference signals from the line-sequential color signals and supplies them to the synthesizing means 39. The synthesizing means 39 complementary to the dividing means 24 synthesizes the two-system signals output from the first and second reproduction processing means, respectively, and adds the synchronizing signal of the high-definition signal to the output. Y signal dd, output PB, output P
The R signals ee and ff are output to transmission lines (not shown) via the D / A converters 40 to 42.

On the other hand, signals reproduced from the magnetic heads C1 and C2 are reproduced by a well-known VHS reproducing system. That is, the reproduced signal is passed through a high-pass filter and a low-pass filter (not shown), and the FM demodulation means 4 of the VHS system.
3 and the reproduction color signal processing means 44 of the VHS system, respectively, where the former demodulates the luminance signal, and the latter converts the low-frequency conversion color signal to high-frequency conversion and the like to demodulate the color signal. Then, an output composite video signal gg obtained by adding and combining both inputs by the adding means 45 is output to a transmission path (not shown).

In this way, while reproducing the Hi-Vision signal, the pseudo-NT obtained by converting the Hi-Vision signal is obtained.
Since the SC signal is recorded, it is possible to reproduce the output composite video signal gg which can be directly connected to the NTSC television receiver.

In the above-described embodiment, the deviation of the FM modulator 27 is set to, for example, 8.5 MHz to 11 MHz in consideration of the band of the Hi-Vision signal. However, when recording the MUSE signal, the band is not so much required. The deviation is set to 6 MHz to 8 MHz, and the number of scanning line conversion means 2 is set.
Instead of 8, a downconverter for converting a MUSE signal into an NTSC signal may be used. In such a case, an iron oxide tape may be used.

In the embodiment described above, the pseudo NTS
Configurations 33 to 35, 43 to 45, C relating to recording of C signal
1, C2 is the same as the configuration of the conventional VHS system,
As a matter of course, a magnetic recording / reproducing apparatus capable of recording / reproducing by the conventional VHS system and capable of recording / reproducing the above-mentioned Hi-Vision signal may also be constituted by using the same.

In the above-described embodiment, the audio signal may be recorded in the deep part of the pseudo NTSC track. In such a case, after prerecording by the FM audio magnetic head adopted in the conventional VHS system, The pseudo NTSC signal may be recorded later by the magnetic heads C1 and C2.

In the above embodiment, the magnetic recording device and the magnetic reproducing device have been described separately for convenience of explanation.
It goes without saying that a magnetic recording / reproducing apparatus integrating these may be used.

[0034]

As described above, according to the configuration of the present invention,
In particular, a pseudo video signal obtained by performing a scanning line number conversion process on a high-definition video signal and converting it to have the standard of a conventional video signal is converted into a first video signal by a conventional video signal recording method on a field-by-field basis. Since recording is performed on the third track adjacent to the second track, a high-quality high-definition video signal is recorded.
In addition, there is an effect that a magnetic recording medium capable of reproducing a high-definition video signal can be produced even in a conventional video signal reproducing method.

As described above, according to the configuration of the present invention, in particular, the first and third tracks on the first to third tracks are used.
Since the distance in one horizontal scanning period for the second divided video signal and the pseudo video signal is the same, the first and second
Of the divided video signal and the pseudo video signal described above can be obtained. As a result, it is possible to easily perform variable-speed reproduction even for a high-definition video signal and reduce the crosstalk between adjacent tracks. There is an effect that it can be enjoyed.

[Brief description of the drawings]

FIG. 1 is a block diagram for explaining a main part of a magnetic recording apparatus according to one embodiment of the present invention.

FIG. 2 is a plan view for explaining an arrangement of a magnetic head provided on a rotating drum.

FIG. 3 is a diagram for explaining a tape pattern.

FIG. 4 is a conceptual diagram for explaining the length of 1H.

FIG. 5 is a block diagram for explaining a main part of a magnetic reproducing apparatus according to one embodiment of the present invention.

FIG. 6 is a block diagram for explaining a conventional magnetic recording device.

FIG. 7 is a block diagram for explaining a conventional magnetic reproducing apparatus.

[Explanation of symbols]

24a to 24c First Y, PB, PR signal (first divided video signal) 24d to 24f Second Y, PB, PR signal (second divided video signal) 28a Recording pseudo Y signal (pseudo video signal) 28b Recording pseudo PB signal (pseudo video signal) 28c Recording pseudo PR signal (pseudo video signal) aa Input Y signal (high definition video signal) bb Input PB signal (high definition video signal) cc Input PR signal (high definition) Video signal) T Magnetic recording medium LH Distance in one horizontal scanning period

Claims (1)

(57) [Claims] 1. A first and second divided video signal obtained by dividing a high-definition video signal having a wider band than that of a conventional video signal into two and extending a time axis by approximately twice, on a magnetic recording medium. The first and second tracks are recorded respectively, and the high definition video signal is subjected to a scan line number conversion process, and the pseudo video signal obtained by conversion so as to satisfy the signal standard of the conventional video signal is converted into a conventional video signal. A video signal recording method wherein a signal is recorded on a third track adjacent to the first and second tracks for each field.