JPS6148157A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To reproduce plural blocks at the same time even when each block is recorded with a different time by using a pilot signal of an already recorded block in additional recording and controlling the tape running speed so that the head is arranged in parallel with a recorded track. CONSTITUTION:A tape is wound on a cylinder by (180+a) deg. and the part of 180 deg. is formed into a pattern divided into 5 blocks (9, 10...13). A block (BL1)9 is a bkock recorded at first and it is recorded basically by the method of lower position restriction. In recording a signal on a track linearly, the head locus of a part (BL4-A3) to be recorded has only to be moved as shown in wave lines. That is, the tape running speed is to be controlled by using a pilot signal obtained while the head is running for the BL1. Thus, one track is divided into plural blocks and recorded with a different time, then the pattern is formed into a linear pattern with simple constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a magnetic recording/reproducing device, in which a recording track is divided into a plurality of blocks, data can be recorded and reproduced in each block, and data can be recorded and reproduced simultaneously in a plurality of blocks. It can be used for devices that record and reproduce blocks.

In particular, the present invention relates to a device that records a time-base compressed audio signal for each block and simultaneously reproduces a plurality of blocks.

Configuration of conventional examples and their problems Conventional, JP-A-58-222402, JP-A-59-43
No. 682 proposes a method of recording by dividing a recording track into several blocks, that is, a method of recording and reproducing a signal obtained by compressing the time axis of an audio signal into six blocks. When recording each block sequentially at different recording dates and times, it is not possible to form a single track lined up.

In other words, one track is divided into 6 blocks.

If each block is recorded sequentially without any special processing, the first
As shown in the figure, it is not possible to record linearly as one track. In FIG. 1, arrow 1 indicates the tape running direction, and arrow 2 indicates the head rotation direction. f
l, f2. f3. f4 indicates a pilot signal recorded together with the information signal in each block.

Even when recorded as shown in FIG. 1, it is possible to reproduce each block. In Figure 2a,
A1. B1. A2. B2. A3 indicates a recording track recorded by the A head and the B head.

HA and HB indicate A head and B head having different azimuth angles. Center HAO of head HA is track A2
The center HB of the head HB is located at the center of the head HB.

The figure shows a state in which B1 is located at the center of track B1. In FIG. 2, the horizontal axis shows the scanning position centered on the head, and the vertical axis shows the reproduction level of the reproduced crosstalk signal from the adjacent track. In the same figure, Pa1. In Pa2, head HB is on track A1. The reproduction level of each pilot signal reproduced from A2 is shown, and the reproduction level of each pilot signal reproduced from Pb1. Pb2 indicates the reproduction level of each pilot signal that the head HA reproduces from tracks B1 and B2. When the center HBo of the head HB scans the center of the track B1, each pilot signal Pa reproduced from the adjacent tracks A1 and A2
The playback level of 1 +Pa2 is equally expressed as vBo. Similarly, when the center HAO of the head HA scans the center of the track A2, the adjacent track B1. Each pilot signal Pb1.B2 is regenerated from Pb1.B2. The reproduction level of Pb2 is equal. Utilizing this fact, when the head scans the block to be reproduced, the levels of the pyloft signals received from the adjacent tracks are compared, and the level-compared signal is placed near the center of the block to be reproduced. One block can be tracked by sampling and holding and adding the sample and hold signal to the speed control circuit of the capsun motor. Although it is possible to reproduce only one block in the pattern recorded as shown in FIG. 1 in this manner, tracking cannot be achieved when a plurality of blocks are reproduced simultaneously.

The disadvantages of not being able to reproduce multiple blocks simultaneously are as follows. To make the explanation easier to understand, it is assumed that the audio signal is divided into six blocks as shown in FIG. 1, and six types of time-axis compressed audio signals are recorded in each block.

Six audio processing circuits are required, but if the blocks are arranged in a straight line, six types of music can be played simultaneously. This will provide a system that allows an unspecified number of people to select their favorite songs, similar to an airplane music service. However, this is not possible unless the trucks are lined up as shown in Figure 1.

The second drawback is that even when it is desired to reproduce information recorded in two blocks and use it in MIXL, it cannot be used because the recording tracks are not linear.

OBJECTS OF THE INVENTION An object of the present invention is to provide a magnetic recording and reproducing apparatus that can record and reproduce information by dividing one track into a plurality of blocks.
Even if each block is recorded at different times,
It is possible to play back multiple blocks at the same time, that is, it uses a method in which the tracks of each block are recorded in a linear manner.

In particular, the object is to propose a system using a head wider than the track pitch.

Structure of the Invention The present invention provides the following advantages: when recording on a blank tape for the first time,
The tape running speed is controlled in the same way as a normal VTR,
When additional recording is performed on a tape on which one or more blocks have been recorded, the tape running speed is controlled using the pilot signal of the already recorded block so that the head is aligned with the recorded track.

DESCRIPTION OF EMBODIMENTS Before detailed explanation of the present invention, the track pitch TP is 1
A pattern recorded by one wide head (TWB, TWA) will be explained.

In FIG. 3, arrow 3 indicates the rotation direction of the rotary head, and arrow 4 indicates the tape running direction. On the tape, heads A and B (not shown) write A1. B1
．． A2. B2. They are recorded sequentially as A3. If the head width of head A is TwA, and the head width of head B is TWB, then after recording once with a width of TWB, recording will be performed with a width of ``WA'' overlapping the portion recorded with ``WB''. As a result, only the left end of the track loci recorded by the heads HA and HB, that is, lines 6 and 6, remain on the drawing. This is a recording pattern in which the lower position is restricted. Next, details of the present invention will be explained using an example.

In Figure 4, the tape is placed on the cylinder (18°+α)
There are 0 windings, and the 180° part is 6 plots (9,
The pattern is divided into 10...13). Block (BLl) 9 is the first block to be recorded, and is basically recorded using the lower position current method described in FIG. 7 indicates the rotation direction of the rotary head, and 8 indicates the running direction. Now, the case of recording in block (BL, a) 12 will be explained. When trying to record a track linearly, the part to be recorded (BL4-
The head trajectory in A3) may be moved as shown by the dotted line. That is, the tape running speed may be controlled as described above using a pilot signal obtained while the head is running on BL1.

Figure 5 a is a redrawn portion of Figure 4 9,
In this figure, the left ends of the heads HA and HB may be run so as to match the left end of the track.

In figure b, the horizontal axis shows the scanning position of the center of the head, and the vertical axis shows the reproduction level of the crosstalk signal reproduced from the adjacent track. (easily approximated).

In the figure, "dal, Paa2" indicate the level of each biloft signal reproduced by the head HB from tracks BL1-A1.BL1-A2,
bb2 is Herad HA's truck BL1-B1. BL1-B2
It shows the level of each pilot signal to be reproduced.

Now, if the head HB runs as shown in Figure 6a, BLl-A
The crosstalk signal level from 1 is vl, and BL
The crosstalk signal level of l-A2 is v2. Similarly, if the head HA runs as shown in Figure 6a, the crosstalk signal from BLl-B1 is v3,
The crosstalk signal from BLl-B2 is V.

That is, tracking control may be performed so that (V2-Vl) and (v4-v3) become constant values. Next, this will be explained using the electrical block diagram shown in FIG.

Now, in order to make the explanation more concrete, the track AI in Figure 4
, B1, A2, B2, A3 have 5 blocks,
The same pilot signal is recorded on each track, fl, f2 . f3. It is assumed that the pilot signal of f4 is sequentially recorded along with the information signal for each track.

The frequency of the pilot signal is set to a value shown in Table 1, for example.

In Table 1, fH indicates the frequency of the horizontal synchronizing signal of the TV signal, and e, 6fH indicates that the frequency is 6.5 times that of the horizontal synchronizing signal.

The frequency difference of the pilot signal between each recording track is the first
As shown in the table, the frequency is <fH or 3fH. Therefore, by extracting the fH and 3fH signals, the sixth
Signals equivalent to v1 to v4 explained in the figure can be obtained.

Note that since the pilot signal is a relatively low frequency signal around 100 KHz, the pilot signal being recorded on the adjacent track can be reproduced as a crosstalk signal even if the head does not scan over the adjacent track. be able to.

1. First, a method for recording in the BLl portion of FIG. 4 will be explained. The information signal input from the terminal 26 is input to the process circuit 26, and the clock signal and timing signal generator 6 are output from the output terminal of the second oscillator 68.
The data selector 70 converts the output of No. 3 into a signal switched by the channel select signal (FIG. 7C) to compress the time axis to the timing when the head travels through the BLl portion. The output of the first oscillator 33 is input to the four-frequency pilot signal generator 32, and the output (head switching signal) of the timing signal generator 63 sequentially generates f 1 + f2, f 3 + f 4 for each track.
.

fl is output. In the first mix circuit 24, 4
The frequency signal and the output of the process circuit 26 are mixed and output to recording amplifiers 22 and 23. The signal input to the recording amplifier 22 is amplified by the error of the L timing of the signal (see Fig. 7), which is the output of the timing signal generator 63 and is fed through the data selector 70, and is then passed through the R side of SWl. Figure 4 BL1 on the tape with head (HA) 20
- Recorded in A1. Similarly, the signal input to the recording amplifier 23 is amplified only at the L timing of the signal (FIG. 7 E) in which the output of the timing signal generator 63 is supplied via the data selector 70, and the signal is amplified via the R side of SW2. Figure 4 BL1- on the tape with head (HB) 21
Recorded in B1. Of course S W 1. SW2 is connected to the R side only at L in FIG. 7C and L in FIG. 7. In this way, the input information signal as well as the pilot signal is transmitted to BL1-A1. BL1-B1
．． BLl-A2...... are recorded sequentially.

Next, a cylinder control system for rotating the head (HA) 20 and the head (HB) 21 will be described.

69 is the head (HA) 20. Take head (HB) 21 9
61 is a disk rotation phase detector which is driven by a cylinder control circuit 6o, the output of which is input to a timing generator 63 via an amplifier 62. Ru. The cylinder control circuit 6Q receives a signal whose frequency is % of the vertical synchronization signal of the video signal, which is obtained by dividing the output of the timing generation circuit 63 (FIG. 7A) and the output of the second oscillator 58 by the frequency dividing circuit 74. The head (HA) 20. Head (HB
) 21 attached thereto is controlled so that it rotates at a constant phase with the output of the frequency dividing circuit 74.

Of course, the speed is controlled by the output of a frequency generator attached to the motor 69, but here it is assumed that it is included in the cylinder control circuit 6o.

Next, control of tape running speed will be explained.

48 is a capstan motor for driving the capstan for running the tape, and 4s is a frequency generator attached to the capstan motor 48, the output of which is amplified by an amplifier 60. This is a circuit that generates pulses using the signal on the delay side, and the speed is set by the amount of delay of the monomulti. The output of the trapezoidal wave generator 51 and the output of the sample pulse generator 52 are input to the sample and hold circuit 53 , and the sampled and held output is output to the synthesizer 46 . Further, the output of the amplifier 50 is frequency-divided by 1/N and divided into the second
The signal is input to the trapezoidal wave generator 56 and output to the second sample and hold circuit 56. The output from the frequency divider circuit 74 is input to the second sample hold circuit 66 .

The frequency division number of the frequency divider 54 depends on the tape running speed and the frequency of the tooth number frequency division circuit 74 of the capstan diameter 1-frequency generator.
determined.

The output of the second sample hold 66 is supplied to SWe via the filter 5T. SWe is an analog SW controlled by a system control circuit (not shown), and when recording information in the block 1, it is synthesized with speed control information by a synthesizer 45 via a terminal 64, and then the filter 4
6 to the motor drive circuit 47.

The motor drive circuit 4 outputs the motor 48 according to the input.
supply current to. With the configuration described above, the capstan motor rotates at a constant number of revolutions and the tape can be run at a constant speed, and recording is performed on the block with the downward position regulation described in FIG. 3.

Next, a method of recording in block 4 will be explained. 26
Since the signal inputted from block 1 is the same as that recorded in block 1, repeated explanation will be avoided.

However, the process circuit 26 is switched by the signal data selection circuit 70 supplied from the timing generator 63,
The signal supplied to the recording amplifier 22 changes from the signal shown in FIG. 7 to the signal shown in FIG. 7, and the signal supplied to the recording amplifier 23 changes from the signal shown in FIG.
As shown in the figure, switching is performed by the data select circuit To. Also S
W1 is connected to the R side only in the L section of FIG. 7G, and SW2 is connected to the R side only in the L section of FIG. 7H. The cylinder control system is the same as when recording the first block, so a description thereof will be omitted.

Next, tape running control will be explained.

As described above, SW1 and SW2 are connected to the P side when recording in block 4, except when the head scans a portion other than block 4.

Therefore, while connected to p
After being input and amplified, it is input to the head switch circuit 29 and output from the timing signal generator 63 (Fig. 7A).
Then, the signals are switched and output as one system of signals only when the head is in contact with the tape. As a result, the information signal and the reproduced RF signal are combined with the pilot signal.
A signal is output from the head switch circuit 29, and the LPF
30 is input. In LPFao, only the pilot signal is separated and extracted from the reproduced RF signal. The pilot signal obtained at this time is a composite signal of the pilot signals recorded on the main scanning track and both adjacent tracks. The circuit 31 is a balanced modulation circuit, and multiplies the aforementioned composite signal by a reference signal supplied from a four-frequency pilot signal generator 32.

The reference signal supplied by the four-frequency pilot signal generator 32 is a pylon signal having the same frequency as the pilot signal recorded on the main scanning track. For example, when the head reproduces red and blue on BLl-A2 in FIG. 6a, the input signal to the balanced modulation circuit 31 is f2. f
3. f4, and the reference signal supplied from the four-frequency signal generator 32 is f3. Therefore, the output signal of the balanced modulation circuit 31 is f2°f3.
The sum and difference signals of each signal of f4 and the signal of f3 are output. The circuit 541 is a tuned amplifier circuit tuned to the signal of IifH, and the circuit 36 is a tuned amplifier circuit tuned to the signal of 3fH. The output of the tuned amplifier circuit 34 is the terminal 6 of SW3.
The output of the tuned amplifier circuit 35 is supplied to the terminal 69 of SW 4 via the amplifier 37.
The signal is supplied to the detection rectifier circuit 39 via.

Also, as will be explained later, when the B head is playing,
SWa is connected to 66, and the fH signal is amplified by the amplifier 36 and then supplied to the detection rectifier circuit 38.
4 is connected to 68, and the output 3fH signal of the tuned amplifier circuit 36 is supplied as is to the detection rectifier circuit 39. The outputs of the detection rectifier circuits 38 and 39 are supplied to a level comparison circuit 4o.

Next, the part of whether or not to pass through the amplifiers 36 and 37 will be explained using FIG. In Fig. 8, or the head switch signal in Fig. 7 A, depending on this head switch, 5
If pilots of the same frequency are recorded for each block, the pilots recorded at the head are fl, f
3. The pilot signal recorded by the B head is f2. f4
can be decided. The pilot that will be played at the end of the meeting will be as shown in Figure 8. Here, the pilot signal obtained from the track written before each head by the balanced modulation method described earlier is as shown in FIG. 8. As can be seen from this figure, in order to reproduce BLl as shown in Figure 4, when the A head is scanning,
3fH is amplified, and when the B head is scanning, fH
need to be amplified. Therefore, the output of the timing signal generator 63 (FIG. 8(k), FIG. 7(a)) is sent to the SW3. It is supplied to SW4 as a switching signal. The reason why the R/P switching circuit 72 is provided is that when reproducing each block, fH & 3f
SW3 and S are set so that the head center is aligned with the track center without amplifying the H signal.
This is provided so that a switching signal can be supplied to W4. Returning to the explanation, each pilot signal extracted as a crosstalk signal from both adjacent tracks is
After being separated and extracted as a difference signal from the pilot signal recorded on the main scanning track, the output signal of the level comparison circuit 40 is a tracking error signal because it includes information on the amount and direction of the head's track deviation. It can be used as As described above, the relationship between the head displacement direction and the fH signal and 3fH signal obtained at that time is reversed between the A track and the B track. The circuit 41 is an analog inversion circuit, and the SWs are analog SWs, which are switched by a head switching signal output from the timing generation circuit 63.

Therefore, when the head regenerates and scans the A track, the output of the circuit 40 is directly output as the output of the SWs.
When the head reproduces and scans the B track, the circuit 41
The signal is inverted in an analog manner and output. For this reason, S
The signals obtained at the output terminal of Ws are A and B) Regardless of the rack, when the head shifts to the right from the track to be scanned, a potential of 10 is always output, and when it shifts to the left, a potential of - is always output. .

The output of the SWs is input to a sample and hold circuit 43 via an LPF 42. The sample pulse for the sample hold circuit 43 is supplied from the timing generation circuit 63. Sample Reno
It is set in the middle of . Considering the case where the pilot is not recorded over the entire track, considering the rise of the balanced modulation circuit 31 and the tuned amplifier circuit 34, and assuming that the head scanning time of one block is t, if the pulse position is set to a position in the vicinity of %. good. The output of the sample and hold circuit 43 is supplied to a synthesizer 45 via a compensation filter 44 and an SWe 65. Frequency generator 49° amplifier 601 trapezoidal wave creation circuit 61. Sample <pulse generator 62. The operation of the sample hold 63 is similar to that when recording to BLl. SWe output and sample hold circuit 53
A signal synthesized by a synthesizer 45 outputs the output from
By supplying the signal to the motor drive amplifier 47 via the motor drive amplifier 47 and supplying its output to the motor 48, it becomes possible to record as one track as shown in FIG. Of course, it is necessary to adjust the amplification factors of the amplifiers 36 and 37 depending on the relationship between the head width and the track pitch.

Furthermore, in the explanation so far, the method of recording one block at a time has been explained, but it is also possible to record two or more blocks at the same time. In this case as well, when recording several blocks simultaneously on a blank tape, record using the method of recording on block 1 in Figure 6, and when additional recording is required, record while tracking using the method of recording on block 4. .

Next, the second embodiment will be explained. In the first embodiment, a method of tracking using the pilot recorded in the first block was explained, but in the second embodiment, the tracking is performed sequentially from the first block. Explain how to do this.

In order to record sequentially, it is necessary to detect which block is currently being recorded. Part 9 about its detection method
This will be explained using FIG.

To detect whether or not a pilot signal is recorded, it is sufficient to detect whether a pilot signal is recorded.

At the beginning of recording, the capacitor is controlled in the manner of recording the first block in the first embodiment, and SWl and SW in FIG.
If W2 is set to the P side, an information signal and a pilot signal are input to the LPF 30 (same as 3o in FIG. 6).

The output of the low-pass filter 30 is input to the fl tuning circuit 76, where only the frequency of fl is extracted and amplified. The amplified output of fl is output to a detection rectifier circuit 76. The output of the detection rectification circuit 76 is compared by a comparator 77, and if a pilot signal is recorded, a high level signal is output. The output of comparator 77 is supplied to sample and hold circuits 78-82. Sample hold circuit 7
8 includes a timing signal generation circuit 6 as a sample pulse.
A pulse of J is supplied at the output of No. 3 (FIG. 10). Similarly, the timing pulses shown in FIG. The forces of the 1st o figure, Yo, Ri, Shi, and So, are struck by the pulse near the center of each block. Circuits 83-87 are Schmitt trigger circuits, which are connected to sample-and-hold circuits 78-82 and used to normalize the outputs of sample-and-hold circuits 78-82 to logic levels H and L. The outputs of Schmitt trigger circuits 83 to 87 are output to a microcomputer 88. The timing at which the microcomputer 88 takes in the outputs of the Schmitt triggers 83 to 87 is based on the output of the timing signal generation circuit 63 as shown in FIG.
[The head switching signal shown in Fig. 10A is input at the same time as the output of the Schmitt triggers 83 to 87, and the microcomputer 88 inputs the signal at an appropriate time, and the head switching signal is input at the same timing. Figure 10 a)
If the signal is High & Bell, the input to the Schmitt circuit is valid, and if it is Low level, it is invalid.

In the microcomputer 88, input the number of pulses of the 10th figure force and check how many times the high level was input. Since fl is recorded every 4 tracks, the tape speed may be significantly distorted. The Schmitt circuit 83 outputs that there is a pilot for each sample unless
~87 is not output. Therefore, if the pilot is detected 4 times after 10 checks, a program should be created that determines that the data has been recorded. If it is determined that this has been recorded, the microcomputer 88 sends the terminal 7
3, it is possible to output the block to be recorded to the data select circuit 7o, and also to indicate the previous block from which the tracking signal should be extracted. Therefore, by adding the block shown in FIG. 9 to the block shown in FIG. 6, the pilot information of the previous block can be detected and recorded while tracking.

Next, a third embodiment will be explained using FIGS. 11, 12, and 13. As shown in FIG. 11, the BmmVTR standard describes the case of application to an overscan type VTR in which the tape is wound around the cylinder by more than 180 degrees. In FIGS. 12 and 13, N indicates a block recorded by the A head, and U indicates a block recorded by the B head. As you can see from this figure, the 13th
Although the recording positions on the tape in the figure are different, in block 3 and blocks et al., the A head and the B head are in contact with the tape at the same time.

At this time, when recording is first performed in block 6 and additional recording is performed in block 3, tracking cannot be performed using the pilot signal of program block 6. Because head H
A. A rotary trannet is used in the connection between the HB and the circuit, so crosstalk cannot be sufficiently removed, so if one head is set to recording mode and the other head is set to playback mode, the signal will be sent to the recording head. The information jumps into the 2-in of the playback head and becomes a very noisy playback signal.
Therefore, it is not possible to record block 6 while trunking using the tracking information of block 6.

Therefore, if you assign block numbers as shown in Figures 12 and 13, first record to the block at the track center, and when recording later, track with that block, the above problem will be solved. can.

Although only the case where tracks are divided into several blocks and recorded has been described above, it is of course possible to use it in place of a video tape recorder that records video signals.

Effects of the Invention By using the present invention, even when one track is divided into multiple blocks and recorded at different times, it is possible to create a single linear pattern with a simple configuration, and multiple blocks can be recorded at different times. can be played back simultaneously, expanding the range of uses for this type of recording device.

[Brief explanation of drawings]

Fig. 1 is a diagram showing a conventional pattern in which one track is divided into six blocks and recorded, and Fig. 2 is a diagram explaining a method of reproducing one block at a time in the pattern of Fig. 1. , Fig. 3 is a diagram explaining the pattern when recording with a head wider than the track pitch, and Fig. 4 is a diagram illustrating the pattern when recording with a head wider than the track pitch.
A diagram showing a pattern when a book track is divided into 6 blocks and recorded by the method of the present invention, FIG. 6 is a diagram illustrating crosstalk signals of adjacent tracks when tracking as shown in FIG. 4 is performed, FIG. is a block diagram showing an embodiment of the present invention, FIG. 7 is a timing chart for explaining FIG. 6, FIG. 8 is a diagram showing a pilot signal for supplementary explanation of FIG. 6, and FIG. The figure is a block diagram added to FIG. 6 for the second embodiment, FIG. 10 is a timing chart for explaining FIG. 9, FIG. 11 is a diagram showing the area around the cylinder showing overscan, and FIG. The figure is a diagram showing an example of the recording order in the case of the third embodiment, and FIG. 13 is a diagram illustrating boolean division in the tape pattern diagram in the case of the third embodiment. 20.21...Head, 22.23...
・Recording amplifier, 24...first mix circuit,
25... Process circuit, 27.28...
・Regenerative amplifier, 29...Head switch circuit,
3o...LPF, 31...Balanced modulation circuit, 32...4-frequency pilot signal creator, 33...First oscillator, 34. 35・°°°
°. Tuned amplifier circuit, 36.37...Amplifier, 38.
39...Detection rectifier circuit, 40...Level comparison circuit, 41...Analog inversion circuit, 42
...LPF, 43 ... Sample hold circuit, 44 ... Compensation filter, 45 ...
...Synthesizer, 46...Filter, 47...
...Motor drive-path, 48...Capstan motor, 49...Frequency generator, 50
...Amplifier, 51...Trapezoidal wave generator,
62...Sample generator, 63...
...Sample and hold circuit, 64...Frequency divider, 65...Second trapezoidal wave generator, 56...
...Second sample and hold circuit, 57...Filter, 68...Second oscillator, 69-...
...Motor, 6゜...Cylinder control circuit, 6
1...disk rotation position needle false voice organ, 62...
... Amplifier, 63 ... Timing signal generator,
7o...Data selector, 72...R
/P switching circuit, 74...--frequency dividing circuit, 75
...fl Tuning circuit, 76...Detection rectifier circuit, 77...Comparator, 78-82...
...Sample hold circuit 83-87...Schmitt trigger, 88...Microcomputer. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure ＾・Sodochu no ua/l Itoi no 1 [Go to 5PJs diagram・Sodo°rinno ca”f@8 ya piri°, 吃 today λ 4
（＝）;

Claims (6)

[Claims] (1) A two-head helical scan magnetic recording and reproducing device that winds a magnetic tape diagonally around a cylinder containing a rotating head and records and reproduces information signals on the magnetic tape as a group of discontinuous recording tracks. , a means for recording and reproducing a recording track by dividing it into a plurality of blocks in the tape width direction, a means for recording a pilot signal in each of the divided blocks, and a means for recording and reproducing a recording track by dividing it into a plurality of blocks in the tape width direction; a means for recording a pilot signal in each of the divided blocks; A means for controlling the speed to be constant, and when recording the second and subsequent blocks, a pilot signal of the previously recorded block is used so that one end of the head is aligned with the end of the track where this pilot signal is recorded. What is claimed is: 1. A magnetic recording and reproducing device comprising a means for tracking control so that even when each block is recorded at different times, a single continuous trajectory is produced. (2) It has means for amplifying pilot signals obtained from adjacent tracks obtained when reproducing a recorded track with a difference in amplification factor, and the amplified pilot signals are obtained by comparing the levels. 2. The magnetic recording and reproducing apparatus according to claim 1, wherein one end of the head is aligned with the track end of the recorded block in response to an error signal. (3) When recording after the second block, use the tracking error signal of the first recording block,
The magnetic recording and reproducing apparatus according to claim 1, characterized in that tracking control is performed. (4) An overscan type magnetic recording/reproducing device in which a tape is wound around a cylinder at an angle of 180° or more, characterized in that a tracking error signal is not obtained at the same timing when a recording current flows. A magnetic recording and reproducing device according to item 1 or 2 of the scope. (5) When recording additionally, the first recording block is the first block that the head comes into contact with, and the second, third, etc. blocks are set in the order in which the rotating head runs the tape.
The magnetic field according to claim 2, characterized in that the second, third, etc. are recorded sequentially, and tracking is performed using a tracking error signal of a block immediately before the recording block. Recording and playback device. (6) The magnetic recording/reproducing apparatus according to claim 3, wherein the block at the center in the width direction of the tape is the first block to be recorded.