JPH0332286A - Video signal recorder - Google Patents

Abstract

PURPOSE:To record much information by recording the segment information of respective segments while dividing the information into plural tracks constituting one segment. CONSTITUTION:In a video signal recorder to execute the segment recording of video signals in a wide band by plural heads 11A1, 11A2, 11B1 and 11B2, the segment information of the respective segments are recorded to be divided into the plural tracks constituting one segment. Namely, a channel dividing circuit 22 divides an input digital video signal DV for each horizontal line into 2 channels for each horizontal line. Thus, since the information of the respective segments are separately recorded as common information for the respective tracks constituting the segment and the segment information quantity of an ID, etc., to be recorded for each horizontal line can be reduced, the other information can be recorded for this reduced part of the segment information.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a video signal recording device suitable for recording wideband signals such as high-definition television signals.

(Summary of the Invention) The present invention relates to a video signal recording device suitable for recording wideband signals such as high-definition television signals. Segment information is recorded by dividing it into a plurality of tracks constituting one segment, so that more information can be recorded.

[Prior Art] MUSE (Multiple Sub-Nyq) for satellite broadcasting of high-definition television signals has recently been proposed.
uistSampling Encoding) etc., the video signal is converted to 8.1. However, if you want to record one minute of such a MUSE signal or a wideband high-definition television signal on a single trunk like a conventional VTR, the head drum diameter is currently Segment recording or multi-channel recording has been proposed since it is not practical. This segment recording method will be explained with reference to FIG.

That is, FIG. 6 is a schematic diagram of the rotary head device, which shows that the rotary head (1^) (IB) is 180 mm as in the conventional case.
The tape (2) is then wound around the guide drum over an angular range of 180 degrees. The number of rotations of the rotary head is doubled compared to the conventional one, that is, 1
This increases the rotation speed so that the frame rotates twice.

When the video signal is recorded using this rotary head device and the drum phase servo is applied so that the vertical synchronization signal of the video signal is recorded at the part where it starts to come into contact with the tape (2), the video signal is sequentially halved. Rotating head (IA) for each field
and (IB), and a track pattern TA is formed on the tape (2) by a rotary head (IA) as shown in FIG.
However, the track pattern TB is created by the rotating head (IB).
are sequentially formed and a video signal is recorded.

A pair of track pattern TA and track pattern TB is called one segment.

Therefore, a video signal for 1/2 field is recorded in each of the track patterns TA and TB,
The signal for one field is recorded with these two track patterns, and the recording wavelength is shorter than that in the conventional case where the signal for one field was recorded on one track pattern. If you look at the track pattern one by one, it will be the same as if it were doubled. Therefore, the band of the Heath hand that can be recorded as each track pattern becomes wider, and it becomes possible to record a wideband signal.

However, when recording in this way, the track pattern T
A will be the information for the upper half of the screen, and track pattern TB will record the information for the lower half of the screen.
During playback, the signals from these track patterns TA and TB are switched every 1/2 field and taken out from the two rotary heads, so the playback screen is located above I.Rack Bakun TA as shown in Figure 8. One half screen (38)
The lower half of the screen (3B) below the track pattern TB is displayed.

Furthermore, the multi-channel recording system uses a plurality of heads to perform simultaneous recording, but in the -111U, a rotating drum records a plurality of track patterns over a period of 1 minute per 1 field.

The present applicant had previously developed the multi-channel recording method on ridges in Japanese Patent Application Laid-Open No. 6
1-196,107. FIG. 9 shows an example of a rotary drum device using this multi-channel recording method. In this example, two pairs of rotary heads (11A,) (IIA2) (IIB,) (I
IB2) is used. A pair of rotating heads (IIA, ) (
IIB,) are arranged at angular intervals of 180 degrees and have the same azimuth angle. Further, a pair of rotating heads (IIA,) (IIB,) are also arranged at an angular interval of 180 degrees and have the same azimuth angle. And in this example, head (IIA,) (IIB,) and head (
11Az) (Iln,) are made to have different azimuth angles from each other. However, when recording so as to form a guard band between adjacent tracks, the azimuth angles may not be different.

Also in this case, head (IIA,) and (Ill'h)
and heads CIIB+) and (11B2) are arranged close to each other and at positions shifted by one rotational angle in the rotational direction.

The rotary head arranged in this manner is rotated at a rotational speed such that it rotates once for one frame of a video signal, similar to a conventional home VTR. Then, as shown in Figure 9, the tape (2) is wound diagonally over a 180'' square area of the guide drum (4) and run at a constant speed in the direction of the arrow in the figure.
Two rotating heads having different azimuth angles form two tracks almost simultaneously during the tape contact period of 172 revolutions, and this is sequentially repeated for 172 revolutions to record.

(Problems to be Solved by the Invention) In the case of the conventional segment recording method described above having a guard band or the segment recording method and multi-channel recording, scanning is performed on either the trunk pattern TA or TB. It is necessary to determine whether For example, the head (IIAI>
(11A2) and (IIB,) (IIB,) have a 1-base, 2-chip configuration, rotate the drum (4) at a rotation speed of 2cm, twice that of one frame, and send a video signal as shown in Fig. 10. TCI (Time CompressedInt
Consider the case where the signal is recorded as an (egration) signal.

This TCI signal is obtained by time-compressing the luminance signal to 374 and the chrominance signal to 1/4 and time-division multiplexing them in one scanning line period, and the chrominance signal is transmitted line-sequentially. That is, in FIG. 10, (5) is the horizontal synchronization signal, (6) is the burst, and (7) is the R-YB-Y
(8) shows the luminance signal.

When such a TC+ signal is recorded in segments, a track pattern as shown in FIG. 11 is obtained on the tape (2). The figure shows a TCI signal of 1100H per frame, the track pattern TA shows an odd line I-ranok pattern recorded with the head (IIA,), and the track pattern TA2 shows the odd line I-ranok pattern recorded with the head (IIA,). Even line track pattern is shown.

Similarly, 1-rack patterns TB, TB2 are recorded by head (110+) (11B2). At this time, the first segment consisting of the track patterns TA, TA2 and the second segment consisting of the track patterns TB, TB2 are respectively the upper half screen (3A) and the lower half screen on the playback screen shown in FIG. It projects a completely different part from the screen (3R), and the azimuth angle is also different between track pattern TA and track pattern TA2, and trunk pattern T.
If we consider the first segment consisting of A + and T A 2 and the second segment consisting of track patterns TB, TB, the azimuth is the same. That is, 8
One frame consists of the book trunk and four segments. Usually, there is an identification number (hereinafter referred to as ID) at the beginning of each track that indicates the segment number. S +, S
2. S c, S s, etc. are added. With such an ID, segments can be identified during normal playback of a VTR, but during variable speed playback, since the head crosses each track pattern, the ID cannot be detected and a normal playback image cannot be obtained. Therefore, in consideration of track jumps during variable speed playback, it is conceivable to add an ID indicating a segment number to each horizontal line. One way to add ID to each horizontal line is to use burst (6) and color signal (
7) In the above example, an ID consisting of 2 bits XZ
By adding , four types of segments can be expressed.

Figures 12A and 12B are the heads (IIA,) shown in Figure 9, respectively.
TCI including ID recorded on each horizontal line of two trunks for one segment recorded simultaneously in (IIA2)
It shows the waveform. In this waveform, the first segment consists of one segment, that is, the track pattern T
Each horizontal line of A, and T A 2 (see Figure 11) has a common segment number (ID) (30)
Similarly, each horizontal line of the second segment, track pattern TB, and TB2 (see Figure 11) has a common segment number (ID)
Z=0.1 is added, and similarly, a common segment number (ID) (30) for each horizontal line of two track patterns in each of the third and fourth segments is XZ=1.0 and X Z =1. .1 is added. That is, a 2-bit ID common to two tracks consisting of one segment.
(30) is additionally recorded, the playback system reads the ID (30) independently from the playback signal of each track, controls the readout of the memory, etc. based on this detection output, and reads the data arranged in the correct order. He was threatening to take it out.

Therefore, there is a problem in that the number of IDs added to each line of the video signal increases as the number of segments increases, and the circuitry required therefor also increases.

The present invention was developed to solve the problem of ridges, and its purpose is to provide a video signal recording device that can record more segment information such as ID on each horizontal line. It is.

[Means for Solving the Problems] As an example of the video signal recording device of the present invention is shown in FIG.
) (llb) (IIB,) (Iloz) In a video signal recording device that performs segment recording, segment information of each segment is divided and recorded into a plurality of tracks constituting one segment.

[Effect]

According to the video signal recording device of the present invention, the information of each segment is divided and recorded as information common to each track constituting the segment, so that the information is recorded for each horizontal line.
Since the amount of segment information such as D can be reduced, other information can be recorded by the amount of segment information reduced.

(Embodiment) Hereinafter, an embodiment of the video signal recording apparatus of the present invention will be described with reference to the drawings.

In FIG. 1, a wideband video signal inputted manually through an input terminal (20) is converted into a digital signal by an A/D converter (21) and supplied to a channel division circuit (22). ), the input digimole video signal DV (see Fig. 3) is divided into two channels for each horizontal line.Then, the information Do of odd lines from this dividing circuit (22) (see Fig. 3) is divided into two channels for each horizontal line. B) is supplied to the time axis expansion circuit (23A) and the time axis is doubled.In addition, the information DE (C in Fig. 3) on even-numbered horizontal lines from the division circuit (22) is supplied to the time axis expansion circuit (23A). It is supplied to the circuit (23B) and expanded to twice the time axis.This time axis expansion circuit (23A) and (23
B> has a memory and has a speed of 1/2 with respect to the write clock.
It can be expanded by reading with a read clock with a frequency of . Note that during this readout, the positions of the heads of one field of the signals of the two channels are aligned.

The output signal EDO (
3D) is supplied to the jJ[I calculating circuit (98) through the delay circuit (24). This delay circuit (24) connects the head (118I) (IIB+) and the head (IIA, ) (
11R2). In addition, the output signal El)E (third
Figure E) is supplied to the adder circuit (9B). These adder circuits (9^) (9B) are connected to the ID signal generating circuit (10) via the switch (29) as shown in Fig. 2A and B.
D X and Z of (30a) to (30d) are burst (
6) and the color signal (7).

As a result, the time axis expansion circuit (23A) and the delay circuit (24A)
) and the video output signal EDE (Fig. 3E) obtained through the time axis expansion circuit (2311), one hint I
D (30a) to (30d) are distributed and recorded on two tracks of one segment. A method of recording IDs representing these four types of segment numbers for each horizontal line of the first to fourth segments will be explained with reference to FIG.

In FIG. 4, each horizontal line (L3, 5) of the first 1 to rack pattern TA constituting the first segment 2 displays the 0th l D (30a) as before. Only 1 bit "O" of the LSB in the human path 00"° is added. Furthermore, the second segment constituting the first segment
Each horizontal line (2, 4, 6
. . . -) is also divided and added with 1 bit "0°°" of the 2-bit MSB indicating the 0th ID (30a).

Similarly, each horizontal line (276, 278, 280
), as before, 2 bits that display the first ID (30b), only "0" to 1 bin 1 of the MSB of "'0.1" are added several times, Furthermore, each horizontal line (
277, 279, 281...) also have the 1st ID
1 bit of 2 bit USB displaying '(30b)''
Divide '1' and add '1'.

Similarly, the second I D (30c) ""1.0'" is applied to each horizontal line of the third segment.
The distribution of "0.1" and l bits is recorded in each of the track patterns of , and the ID of No. 3 II (30d) "'l, 1" is similarly recorded in each horizontal line of the third segment l~. The data is divided into the fifth and sixth 1-to-Rack patterns and recorded one bit at a time.

Then, the composite video signal with the ID added from the adder circuit (9A) (9B) is sent to the D/A converter (25^)'
('25 B>) and are returned to analog signals.

The analogized composite video signal is fed to FM modulation circuits (268) and (26n) for FM modulation, and then passed through amplifiers (27A) and (27B) to switch circuits (28A) and (28B'). ).

Then, the switch circuit (28A) is alternately switched by the switching signal RFSW every time the head (IIA, ) and the head (1'lB,) are connected to the tape, and the switch circuit (28A) During the period, the signal passed through the amplifier (27A) is sent to these heads (
118,) (110,). Similarly, switching signal I? li! The switch circuit (28B) is switched by J2, and signals are alternately supplied to these heads (IIA2) (11B2) through the amplifier ('271+) during the tape contact period of the heads (11A2) and (], 1.B,). be done.

Therefore, in this case, the switching signals 1sW, and l? 'l
'sW.

is head (1]A1) (1,1B,) and (1182:
) The phase is made to differ by an amount corresponding to the angular interval from (11, 82).

In terms of signals, the output signal of the time axis expansion circuit (23A) is passed through the delay circuit (24) to the head (118l) (I
IA2) and IIB+ (11B2) are delayed by the rotation angle interval of 1 degree and are supplied to the D/A converter (25A) via the adder circuit (98). Therefore, although the switching points of switch circuits (288) and (28B) are different in terms of time, from the perspective of a human-powered broadband signal, they are the same switching point, and each one is divided into two segments of one field signal. It is recorded as tracks TA, TA, TB, TB without excess or deficiency.

In the recording l~rack pattern, as shown in FIG. 4, one field is a signal in which one horizontal line is expanded over two horizontal line sections, and tracking is performed at TA2 or TB, and then TB.

For example, each tree is divided into two segments.

At the time of recording, the signal for one tracking control call may be recorded at the end of the tape in the width direction in the same manner as in the past, or the signal for one tracking control call may be recorded as a video signal like 8 mm video. It is also possible to cyclically record four-frequency pilot signals in a superimposed manner and use these four-frequency pilot signals during playback to perform tracking.

By configuring the recording system in this way, the amount of segment information for each horizontal line can be reduced, so other information can be recorded accordingly.

FIG. 5 shows a reproduction system for signals recorded in this manner.

That is, in FIG. 5, when heads (IIA,) and (IIB,) simultaneously scan tracks TA and TA2, they also scan tracks TA and TA2, and
By scanning B2) in the same manner, reproduction signals of two channels can be obtained simultaneously. And these four heads (
11, A, ) and (11111) and (1182) and (1182) switching signals 11FsW and I
? By being switched by PSW2, signals are obtained from the two tracks TA, TA2TB, TB sequentially through the switch circuits (31A) and (31B). 5 In this case, the tracking servo is applied using the control signal or the 4-frequency biro I signal, and at the same time the switching signals RFSW and RPSWz
is the switch circuit (
A phase servo is applied so that 31A) and 31B select the output of the head.

The signals obtained from the switch circuits (31A) and (31B) pass through amplifiers (32A) and (32B) to FM demodulation circuits (33^) and (33B) and dropout detection circuits (, 134) and (43B). supplied to F
M demodulation is performed and dropout detection is performed. F
Each demodulated output is sent to an A/D converter (34A)
and (34B) and time axis correction circuit (T B C) (4
The signal is supplied to the ID detection circuit (36) and memory (358) (35B) via 5A) (45B), converted into a digital signal, time axis correction is performed, and ID detection and memory writing are performed. The above T B C (45A)
and (45B) in addition to normal jitter correction, in this example, I
At the time of D detection, the reproduction signals of multiple tracks must be reproduced with the same quiring6. However, in a head such as 1 head with 2 chips, the assembly accuracy of the chip width is about ±5 μrn, which is With the above sample clock number, this corresponds to a deviation of ±6 to 7 samples (for example, drum diameter 76φ, 89.51 (/line, 1800 samples/H)).

For this purpose, as shown in FIG. 3, the interval between the color signal (7) of the video signal and I
A) The memory in (45B) is also used to perform phase matching so that the phase matches that of the other party even when recording another's own data.

That is, by writing into the memory in T B C (45A) (45B) in synchronization with the synchronization signal and reading with the reference synchronization signal, the phase of data on each track can be matched.

Therefore, a line memory or the like may be used instead of the TBC.

In this way, IDs are simultaneously detected from track patterns TA and TA2 that are in phase with each other by a common ID detection circuit (36). In this example, a 1-bit ID is detected from each track playback line, and a memory (35A) (3
5B) as a 2-bit ID. This memory (35A) (3511) and TBC (458) (45B
) is performed by a clock generation circuit or timing controller (not shown).

ID written in memo IJ (35A) (35B)
Signals and video signals are each time-based pressure 11 circuits (39A)
The signals supplied to (39B) and expanded twice are time-compressed to 1/2, and the bone signal for one horizontal period is returned to the original signal having a time length of one horizontal period. In this case, among the signals from the memory (35B), depending on the angular difference in the rotation direction between the two heads (118,) and (1182) or (IIB,) and (11B2), head(
The signals from (11Az) and (IIB2) are sent to the delay circuit (3
8) and is supplied to the time-base compression circuit (39B), where it is temporally aligned with the signal from the head (11/l,) (11B2).

The signals restored to their original time length by the time axis compression circuits (39A) and (39B) are supplied to the synthesis circuit (40).

The synthesis circuit (40) alternately obtains and combines signals from the time axis compression circuits (39A) and (39B) for each horizontal line, and sends the synthesized output to the D/A converter (41). The input signal is supplied and converted into the original analog broadband video signal, which is then delivered to the output terminal (42).

As described above, it is possible to record video No. 13 of 1 minute of l-feel on two tracks each with the time axis expanded, so that the recording wavelength of the signal per l-rank becomes longer, and a broadband signal is recorded. It is possible to record and re-record the signal, and by reading out the ID for each horizontal line corresponding to the difference between the first to fourth segments, it is possible to easily write and read composite video signals, so track jumps, etc. can be performed. It is possible to prevent the image from being distorted even during variable speed playback.

Further, although the above example describes a head having an azimuth, a similar configuration can be used in the case of two-hand guard band recording. Further, the number of pairs of rotating heads is not limited to two pairs, but may be three or more pairs, or the number of rotations of the tram may be n times faster, and various changes may be made without departing from the gist of the present invention. It's obvious.

[Effects of the Invention] In the present invention, when recording segment information such as an ID for identifying a segment for each horizontal line, the segment information common to one segment is divided into two tracks constituting one segment. Since the segment information such as ID recorded on each horizontal line can be reduced, other information (for example, color information) can be inserted, especially in VTRs where the number of tracks per segment is large. This is particularly effective since n-bit segment information becomes n/2.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a recording system showing an embodiment of the video signal recording device of the present invention, and FIG. 2 is a waveform diagram showing an example of the ID signal waveform recorded in the video signal of the video signal recording device of the present invention. FIG. 3 is a timing chart during recording of the video signal recording device of the present invention, and FIG. 4 is a track pattern diagram of the present invention.
FIG. 5 is a block diagram showing an embodiment of the reproduction system of the video signal recording device of the present invention, FIG. 6 is a schematic diagram of a conventional rotary head device, and FIG. 7 is a recording track pattern by the rotary head of FIG. 6. 8 is a diagram showing the playback screen, FIG. 9 is an explanatory diagram of another conventional rotary head device, and FIG. 10 is a TC recorded by the rotary head of FIG. 9.
1 waveform diagram, FIG. 11 is a recorded l-rank button diagram, and FIG. 12 is a conventional ID waveform diagram. (9A) (9B) is an adder circuit, (10) is an ID signal generation circuit, (11A+) (IIA,) (IIB,)
(IIB2) is the middle of the round, (35^) (35B)
is a memory, and (3G) is an ID detection circuit. Agent Hidemori Matsukuma JP 3-32286 (7) Mouth = JP 3 32286 (8) JP 3 32286 (9) JP 3 32286 (10) ID waveform leap diagram 12

Claims (1)

[Claims] In a video signal recording device that records a wideband video signal in segments using a plurality of heads, segment information of each segment is divided and recorded into a plurality of tracks constituting one segment. Features of video signal recording device.