JPS58172080A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent a difference between an editing point during reproduction and an actual editing point, by displacing the rotary magnetic head of a magnetic recording and reproducing device in slow mode. CONSTITUTION:In slow mode, the preset value of an up/down counter 47 as the editing point is compared at a part 85 with an output signal from an up/down counter 68 corresponding to tracks that rotary magnetic heads 6a and 6b reproduce actually; only when the preset value of the counter 47 is greater than the output signal from the counter 68, a correcting signal for displacing the magnetic heads 6a and 6b by one track is added at a part 86 to the output signal from the counter 68 and the sum signal is supplied to a D-A converter 70 to displace the magnetic heads 6a and 6b. Consequently, the address of the editing point coincides with the reproduced tracks, i.e. a picture all the time, preventing an error of editing.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording/reproducing device having a structure in which a rotating magnetic head is attached to a rotating drum via an electro-mechanical conversion element, and particularly relates to a magnetic recording/reproducing device having a structure in which a rotating magnetic head is attached to a rotating drum via an electro-mechanical conversion element. This is to prevent errors between the editing points and the actual editing points when India is played back by dynamic tracking.

In a magnetic recording/reproducing device (hereinafter referred to as VTR), for example, two rotating magnetic heads (hereinafter simply referred to as heads) are placed at equiangular intervals (in this case, 18 mm) with respect to a rotating drum or rotary plate.
0°), and signals are normally recorded alternately on the magnetic tape or reproduced alternately from the magnetic tape as the rotating drum rotates.

By the way, in order to accurately trace (scan) these heads to the recording track during playback, these heads are attached to a rotating drum via an electro-mechanical conversion element such as a bimorph plate (hereinafter referred to as a bimorph plate). It has been proposed to drive (shift) the electrodes attached to both sides of the bimorph plate by supplying a drive signal to the electrodes attached to both sides of the bimorph plate during playback, so that the head automatically traces the recording track. There is.

To explain this with respect to Figures 111 to 5, (1)
2 shows the substrate, (2) the entire rotating magnetic head device (rotating drum), (3) the upper drum, (4) the lower drum, and (5) the drive mechanism for the motor. In this example, the lower drum (4) is fixed on the substrate (1), and only the upper drum (3) rotates.
) and (6b) A pair of heads (rotating magnetic heads) are attached to the upper drum (3) via bimorph plates (7a) and (7b), respectively. Of course, the angular spacing between the two in this case is chosen to be 180°. In addition, (8) is a tape guide installed or formed on the lower drum (4), (
9) is a control (CTL) pulse magnetic head, (
(2) shows a magnetic tape, 1 for the rotating drum (2).
80mm is attached over a slightly larger angular range so that it can be transported in good condition. Therefore, the angle 0 shown in Figure 1 is the head (6m) (6k) of the magnetic tape (
The contiguous interval for (contact) is the non-contact interval.

Figure 3 shows the recording tracks of the magnetic chip f (rotation), and it is assumed that the track (11m) is recorded by the head (6a) K, the track (llb) li, the head (6b), and the K. *Indicates Pat FiCTL t*rus.

In such a device, the head (6a) (6
b) (D) rough 1 (11*) and (llb
) Detects the positional deviation of the root trace with respect to K and supplies a corresponding drive signal to the bimorph plates (7a) and (7b), thereby increasing the height of the heads (6a) and (6b), that is, the upper drum (3). This means that the rotating magnetic head will almost accurately track the tape on the tape, not only in the normal playback mode, but also in various other playback modes, that is, at various tape speeds. It is possible to trace the recording tracks (l1m) and (llb) and thus obtain a playback signal free of guardband noise.

In this case, the signals supplied to the bimorph plates (7 &) and (7b) are preset by the transfer speed (tape speed) of the magnetic chip fα1, the information signal from the CTL/f pulse Pet, etc. While the head (61) or (6b) is reproducing the signal from the track (l1m) or (llb), the drive signal to the bimorph plate (7a) or (7b) is controlled to an appropriate value by a closed-loop feedback signal. Tracking adjustment is done using the bling method. Here, tracking adjustment using the wobbling method will be explained with reference to FIG. In FIG. 4, α◆ indicates a sine wave signal generator, and this sine wave signal generator α◆ generates a sine wave signal of a predetermined frequency. The O sine wave signal from the sine wave signal generator a4 is applied as a wobbling signal to both sides of the bimorph plate (7a) via the adder section and is supplied to Kyuden IIK. The bimorph plate (7a) reciprocates the magnetic head (6a) slightly in a direction transverse to the recording track in response to this sine wave signal. As a result, the magnetic head (6
The degree of modulation of the reproduced FM signal from a) fluctuates according to the sine wave signal, and the phase thereof varies depending on whether the magnetic head (6 &) is biased to the left or right with respect to the center of the recording track in the width direction. It is made into a modulated wave. The reproduced signal in the form of an AM modulated wave from the magnetic head (6a) is supplied to one input terminal of the comparator circuit (b) via the high frequency envelope detection circuit a0. On the other hand, a sine wave signal from a sine wave signal generator (b) is supplied to the other input (5) terminal of this comparison circuit (b). A predetermined comparison is performed in this comparison circuit α, and the comparison output is supplied to an adder (2) K and added to the sine wave signal from the sine wave signal generator α◆ as a signal containing a correction signal. That is, when the magnetic head (6a) is tracking the recording track without being biased to the left or right, K provides a reference voltage as a comparison output, and when it is biased to the left, K provides a reference voltage as a comparison output to that biased voltage. Accordingly, a voltage is obtained that is the sum of the positive voltage that shifts the bimorph plate (7a) to the right and the reference voltage, and when the bimorph plate (7a) is shifted to the right, the bimorph plate (7a) is shifted as a comparative output according to the amount of shift.
A voltage is obtained which is the sum of the negative voltage which shifts 7a) to the left and the reference voltage, and such voltage is supplied to the adder. In this way, when the magnetic head (61) is off the recording track, nine signals are supplied to the immorph plate (7a) accordingly, and as a result, the magnetic head (61)
6a) is made to perform accurate pressure tracking on the recording track. The bimorph plate (7a) and the magnetic head (6a) are described here, but the bimorph plate (7b)
and the magnetic head (6) (6b) are also controlled in the same way.

This head (6a) or (6b) 0 magnetic tape (rolling)
In the non-contact section with the above-mentioned nine information signals, ΔImorph I[ is driven only by the information signals, and the head (6a) or (6b) is driven by the track (l1m) or ( 11b) has the disadvantage that a large tracing error is likely to occur at the initial position of tracing.

To explain this state, for example, when playing still images, in still playback, the heads (6m) and (6b)
For example, the trace will be traced on the locus 2 shown by the dotted line in FIG. 3, and there will be an error of angle θ· from the track that should be traced, so noise will occur at this tt.

Therefore, in this case, when only the head (6a) is connected, the tilt signal B is transmitted to the bimorph plate (71) as shown in FIG.
) by changing the height of the head (61) over time, and repeating this operation for each tape contact section #1 of the head (61).
) can be accurately traced on the track (l1m) or the line (llb). In Figure 5 M and l, time is plotted on the horizontal axis, and in Figure 5 M, the bimorph plate (
In Fig. 5B, the vertical axis shows the voltage V of the drive signal of the head (7m) (7m), and the deviation amount of the tip of the bimorph plate (71) (to be more precise, the deviation amount of the tip of the bimorph plate (71)
1) Height deviation amount a) is taken and shown. In this case, V. is given in correspondence to the deviation amount .delta.. shown by the arrow in FIG. In Fig. 5, τ1 and τrepresent respectively the l-field period, τ1 is the reproduction period of the head (6a), τ嘗 is the flyback period of the same head (6m), and the reproduction by the head (6b). period, τ龜(=
τ10τ snow) is one rotation period of the rotating drum (2).

The head (6b) may perform the same operation as described above with a period delayed by one field.

Although the above description has been made for the case of still mode, it is also possible to supply the slope signal S according to the Ziege speed to the bimorph plates (7a) and (7b), respectively, even when the tape is at a speed other than the normal speed such as in slow mode. It is. By the way, taking the slow mode as an example, as mentioned above, the bimorph plates (71) and (7b) of the slope signal S.
), it is possible to have the heads (6a) and (6b) trace according to the tracks, but each track (l1m) and (llb) of each head (6a) and (6b) It is unavoidable that vertical tracking occurs at the starting point of the trace.

Now, to explain the slow mode in which the tape speed is 1/3 of the normal speed using Figure 7, the (
l1m) and (llb) are the nine recording tracks described above, Pe
t is the so-called CTL Arus. 111 again? The figure and E are the switching/mother pulses formed by the analogue (generally PG) obtained in response to the rotation of the rotary drum (2), and the element Pl/\Irepel "1". It is assumed that reproduction signals can be obtained from the head (6m) during the period and from the head (6b) during the high level 1@1# period of /4 pulse Py. Then, at time tti −
%-tl, IC, the head (6a) first traces the leftmost track (l1m) in Fig. ``'''' Between 114 and 114 (9) Rad (61) traces the trajectory indicated by the dotted line from time t14 to
= At the time, the head (6b) starts tracing the track (llb), that is, from time ttm to tts.
Mistracking occurs between tts and tt4.

In order to avoid this, the head (6b) to be traced between time points t1 and tts should be shifted in the direction indicated by the arrow in advance, and its size and length should be shifted in advance, and the head (6b) to be traced between time points t1* and tts should be shifted in advance.
The head (6 &) to be traced between the four lines may be shifted in advance in the direction indicated by the arrow - and its size and length.

For this reason, the applicant previously proposed the expected voltage generation circuit (2) shown in FIG. To explain this below, CT
The CTL /f pulse Pet from the L head (9) is suitably amplified by an amplifier @ and supplied to the load terminal of the up/down counter, while a frequency generator (F This signal (pulse) is amplified by the amplifier and supplied to the clock signal input terminal of the counter (b). Therefore, the (10) analogy from this FG is The repetition frequency corresponds to the tape speed.The input terminal is an input terminal to which an addition command signal or a subtraction command signal is supplied according to the forward and reverse Kg of the tape, and this is connected to the up-down signal input terminal of the taunter. Ru.

In Fig. 7A, CTL/Archive Pet and Track (
l1m) (llb), and FIG. 71 shows the state of ζ0
CTL /4 LuzPet #FG against IC d&
x ptg (*obtained in relation to the rotation of Yapstan), and the vG pulse Pfg has a repetition frequency of 900 Hl in a normal playback mode, and the CTL pulse P[ For t, there are 30 pulses within one cycle, that is, within one frame of the Eirin signal.The number of /4 pulses within one frame is irrelevant to the tape speed.

It is.

The above-mentioned color/tertiary output signal is supplied to a DM (digital-to-analog) converter, which produces a step-wave signal SI shown in FIG. 7C. In a normal playback state, the trace start point for each track (l1m) and (oh)K of each head (6m) and (6b), for example, the time point tll, is approximately at the middle height level of the staircase waveform signal SI) and temporally. It is assumed that the phase of this signal Ss is selected so that they match. Such a staircase wave signal S
, is the sampling hold circuit (52m) and (sb)
are supplied to the terminals (53m) and their output voltages are supplied to the terminals (53m) and (
53b) through the bimorph plates (7a) and (7b), respectively.
). On the other hand, these sampling hold circuits (52m) and (szb)K have switching/#ruses Px and Py shown in the seventh diagram and E, respectively, connected to terminals (54m).
) and (54b). In this example, the tape speed is in the normal state as described above. Therefore, this switching A Lus P! during one cycle of CTL /# Lus Pet! K and py have a frequency of 3Hi.

Then, the head (6a) comes into contact with the tape cLQ during the high level period (11") of the switching signal Px (high level + 7), and the sampling hold circuit (52m) is held, and the high level period 1sJ1 ("
The head (6b) is in contact with the tape (2) during a period of 1", and the sampling and hold circuit (52b) is held, and the staircase waveform signals S, respectively, are generated at the rising points of the signals Pg and Pl, respectively. shall be sampled.

In FIG. 7, at time tll when the head (6a) O) race starts, the signal SS sampled by the / middle pulse Px K is located approximately at the center of the staircase wave (a number s, 0 m width). The voltage at this position is the reference voltage for the expected voltage (
For example, if the voltage is set to 0, the expected voltage O will be supplied to the oar morph plate (7a), and therefore, in this case, the oar morph plate (7a) will not be shifted at all.
Therefore, at this time tti, the head (6a) of the bimorph plate (7a) starts to come into contact with the tape αQ from its original position,
From this point K, the head (6a) just starts tracing on the track (11 positions). Thereafter, the above-mentioned control signal is supplied to this pie-self plate (7a) to ensure tracing on the track.

In this way, between time points tll and tl1, the head (6a)
When the reproduction of the signal is finished, tracing of the head (6b) starts from time tll.

(13) By the way, at the rising time of Noculus Py (time ttx), the signal SI is output to the sampling and holding circuit (52b).
Since the signal is sampled with K, the resulting signal s
l, that is, the expected voltage is supplied to the bimorph plate (7b) K,
Therefore, this bimorph plate (7b) responds to one direction of the arrow (for example, the positive direction 1. and the magnitude vl of the signal 8.) based on the polarity (for example, +) of the signal Ss that has been sunciled, and splits the light. The length will vary, therefore the head (6b
) In the case of C, the track (l1m) will be traced, and from then on, the control signal will be supplied to the bimorph plate (Wb) Ic as described later, and the head (6b) will be traced on the track (l1m) reliably. It will be traced to

Next, between time points tss and ti4, the head (6a) K enters the trace period again, but at time point tts, the good signal sl sampled by the sampling and holding circuit (52m) becomes -V as shown in FIG. 7C. Therefore, this voltage is supplied to the bimorph plate (7&), so in this case, this bimorph plate (7a) is in the negative direction and the signal V,
(14) Therefore, the head (6a) traces on the track (flb).

At time t14, the sampling hold circuit (5!b) K
The sampled voltage becomes 0 (reference voltage), and the same operation is repeated <>, so each head (6a)
and (6b) are both supplied with an expected voltage before the start of the trace (at the start of the trace), so that a reliable trace can be represented. FIG. 7P shows the voltages obtained from the sampling and holding circuits (52m) and (52b) in succession.

Although it is possible to obtain expected voltages in this way, as is clear from FIG. and bimorph plate (71) and ()b)
, because the response characteristics of i and k are bad.

The disadvantage is that complete tracking cannot be obtained before tracing begins.

To avoid such drawbacks, at the point when a certain head finishes tracing with Qi/, the position (height) to be traced next time by that head is detected, that is, the prediction is obtained, and the head When the head traces next time by supplying the above-mentioned predicted voltage to the imitation plate of the head during the non-contact period with Qi f, mistracking or large mistracking occurs at the beginning of the trace. As a solution to this problem, the one shown in FIG. 8 has been proposed.

Referring to FIG. 8, parts in FIG. 8 that correspond to those in FIG. 6 are designated with the same reference numerals.

CTL A pulse Pet from CTL head (9) is appropriately amplified by amplifier MK and sent to up/down counter (4).
'i) (Let this be t-1st up/down counter)
is supplied to the load terminal of the VTR, while the VTR's capstan (
A frequency generator (FG) (not shown) is attached to the frequency generator (FG), and the signal p (/4') is amplified by an amplifier and supplied to the clock signal input terminal of the counter 171. Ru. The frequency of the main pulse of the mask corresponds to the tape speed, and this is not necessarily obtained only from the signal from the special KFG light. Switching/4 Luss P with a frequency of typically 30Hz
x and Py (same as explained in the 7th illustration or tobi) 4
The input terminal (54m) and (54b) are supplied with the input terminal (54m) and (54b).
4a) K: The supplied 9I analogy is 60Hs4) (the 9I analogy with the repeating frequency is 60Hs4)
(FIG. 9F), this is supplied to the load terminal of the second up/down counter I@, and further KF (supplied from Jl) 9 pulses are similarly applied to the frequency doubling circuit 1IIK.
Then FG @K is obtained/The repetition frequency of the arm is 2
This is supplied to the clock terminal of the up-down counter mentioned above, and when there is a load input to the second counter, the output of the first counter is stored as the input data of the 20th counter. 20 counter is configured to count the clock pulse number (the clock pulse number from the doubling circuit) (17) based on the stored count value.

The output of this second counter is digital-analog (D
-A) is supplied to the cost exchanger (2), and its output is supplied to the first and the 20th sampling hold circuits (7'l m
) and (71b) K is supplied. Further terminal (54m)
The switching/4 pulses Px and py shown in the ninth diagram and E supplied to (54b) and (54b) are respectively the first and 11!2
are supplied to the delay circuits (72m) and (72b) in which the /'P pulses Pi shown in FIGS.
and p3, and in such mother rus Pl and Pj D-A
The output of the converter is sampled and held at the time of occurrence of these pulses. (73m) and (73b) are output terminals for the signals sampled in this way. The delay time by these delay circuits (72m) and (72b) is a little less than one field from the rising edge of each signal Px and py. For example, just before the end of reproduction of the head (6a), One sampling hole circuit (71 m) for the bimorph plate (7a) of 6 m) is sampled. And these sampling hold circuits (71m) (18
) and (71b), the holding of the vol field is performed, respectively.

In the circuit shown in FIG. 8, the Δrus from FG- is doubled by the frequency doubling circuit and then output to the second counter fllK.
However, it is also possible to set in advance so that the frequency of the output signal obtained by the input signal is the frequency supplied to the clock signal input terminal of the above-mentioned 11120 counter. In this case, the frequency doubling circuit 5 becomes unnecessary and supplies the FG signal to the second counter directly or through an amplifier if necessary.
Even if the sub-wave number t-'AK of the Δrus of FG-Y) is stepped down and supplied to the first counter@0 clock signal input terminal, the same effect as described above is achieved.

Next, the operation of the above-described configuration will be explained using FIG. 9.

In the first counter, exactly the same operation as explained in FIG. 6 is performed, so that the signal aS explained in @7C is obtained at its output side. Signal sl shown in FIG. 9B
However, in Fig. 9, the enlarged stepped portion is shown as a straight line. Furthermore, if we consider only the second counter (i.e., consider it as the output 1o of the first counter), it will be reset every time the switching starts (see Figure 9F), so the above-mentioned In this state, a signal S. shown in FIG. 9C is obtained. This signal S-
Since the clock signal input to the counter is twice as large as the signal S1, the slope is twice that of the signal S1.

By the way, this second counter is supplied with the signal sl from the first counter @no, and since the t4 pulse Pg is supplied from the doubler circuit to the load terminal of the second counter, the first The output (count) of the second counter is used as the base, and the counted value is added to the output terminal of the second counter, so that a signal Sγ having the waveform shown in FIG. 9H is obtained at the output terminal of this second counter. . Note that Figure 9 GFi represents the above-mentioned nine calculation processes by this second counter branch in waveforms, and signals corresponding to those in Figures B and C are given the same reference numerals. This example shows the case when the tape speed is normal (), so one track is traced twice to heads (6a) and (6b), and then traced a total of 4 times. This is the case.・And according to the expected voltage according to this wJ8 diagram) head (6a
) and (6b) when the trace start points are not corrected. and b are shown sequentially. In FIG. 9, at time t, 1, the head (6b) is just on the track (
11b) Since it is K to trace the top, there is no need to apply the expected voltage to the bimorph @ <7b), and at time tmm, ' is the head (6m) ' in one direction of the arrow and its size is Is it necessary to shift) Furthermore, time i,
, it is necessary to shift the head (6b) in the direction shown by the arrow - and its size Kumon by 1N. By the way, when we assume that the center level to of the signal Ss with direction and magnitude h ssB, what can be obtained is the same p as explained in FIG. (21) The head (6a) K is marked with an ○ mark t, and the head (6b) is marked with an X mark at the corresponding position.
All you have to do is supply it.

Next, referring to @9 Figure H, the signal ST is sampled in the P1 sampling and hold circuit (71m) immediately before the time tut, and this is held for approximately l field period, and after the time tmm. The voltage is applied to the bimorph plate (7a). The sampling voltage V1' in this case is the voltage v1, y, rkv1 shown in FIG. 9B mentioned above.

The signal s7 immediately before the time ts is sampled by the sampling circuit (71b), and the values V, / are the above-mentioned V, y, /, and v1.

As explained above, according to the example in FIG. 8, with respect to the Ever head (6 m), the tracing head can be traced at the final point by sampling and holding the signal 87 at the head ( Regarding (22) in 6b), at almost the final point of the trace, the signal art sun! is generated by Δrus Pj. By ring-holding, it is possible to detect the height of each head (6a) and (6b) from the reference position at the start point of the next trace, and these sampled signals are used to hold the respective heads (6a) and (6b).
During the 7-repack period of 6a) and (6b), the respective spatulas P (6m) and (6b) are installed on the 9-parallel morph plates (7a) and (7b) K, respectively, so each head (61) and (6b) can be brought and placed at the appropriate trace start position without any difficulty, so @
As explained in Figure 7, there is a disadvantage that 11m can be avoided and the height can be corrected with a margin.By the way, as already mentioned, the rotating magnetic head (6m) - (6b) and the CTL head (9) When the relative position of the VTR 1 shifts, the advantage of the dynamic tracking described above is lost.This problem becomes a problem when used in a VTR 1 in which the variation of the relative position described above exceeds the permissible range. For example, when recording with a VTR with a proper relative position and playing back magnetic tape with a VTR with an incorrect relative position, or vice versa, the magnetic tape may have a large extension. That's when it becomes a problem.

The rotating magnetic head (6 m) shown in FIG. 10 was created in consideration of these circumstances.

(6b) and the CTL head (9) is detected so that reliable dynamic tracking can be performed based on this detection.

In Figure 410, the parts corresponding to those in Figure 8 are given a corresponding reference number superimposed to indicate the detailed description of each f! Omit A.

In Fig. 10, the preset value of the counter @η is
The rotary magnetic head (6 breaths), (6b) can be varied according to the relative position shift between the CTL head (9) and the CTL head (9).
A latch circuit 6p and an up/down counter are provided at the front stage of the counter.

That is, the switching pulse Pxf is supplied from the terminal (54m) to the load terminal of the counter, and at the timing of this switching/9 pulse Px, a predetermined value t is obtained.
Transfer to counter ■. Then, after this, the PG output from the amplifier Pfgt is counted so that the counter continues counting. On the other hand, terminal - is a signal indicating that the VTR mode is normal playback mode, for example Qi? −
Ensure that a lock signal is provided. And this chi?・Supply the lock signal to the AND circuit −〇@1 input terminal,
CTL A pulse Pet is supplied to this 20th input terminal via an amplifier. Then, based on the output of the AND circuit -, the count output of the latch circuit INK counter 2 is transferred. The output signal from this latch circuit is transferred to the counter by the timer in the KCTL line, similar to the example in the gS diagram.

According to such a configuration, in the normal playback mode, the control pulse is supplied to the latch circuit through the AND circuit l14t, so that the contents of the latch circuit are changed according to the count contents of the counter I O at the previous stage. Variable. As a result, the preset value of the counter is varied.

Specifically, the counter is switching/4rus Px
Based on (Figure 11)
Counting starts from P, and the switch (25) turns CTL ArusPet (later than Px).
Suppose that C) in FIG. 11 occurs. That is, assuming that the relative positions of the rotating magnetic heads (6m), (6b) and the CTL head (9) are shifted, the counting content C1 is transferred to the latch circuit 6υ at the timing t shown by the broken line in FIG.
P' is transferred. Then, at the next stage counter 0,
Counting is performed from timing 1 shown by a broken line using this count content CI' as a preset value. Here, the previous 8th
The count contents of the counter (b) in the example shown are shown by a dashed-dotted line.

As is clear from the figure, the count content CP' of the first example is larger than that of the previous one by ΔC, and in this example, the time difference is 60 minutes earlier, and the count content of the counter 6'i) is larger than that of the previous one by ΔC. The maximum value Crn*x is reached. This time shift Δt (FIG. 11D) is equal to the shift between the switching/9 pulse Pg (FIG. 11A) and the CTL/transmission pulse Pet (FIG. 11C). That is, so that the counter @η counts up by the time of this shift, the extra reset value C,/meeting counter is transferred by the shift ΔC corresponding to the time to match.

The above explains how control/IP Luss works (2
6) Regardless of the phase, the rotating magnetic spatula P (6m) # (
6b) means that the count output 0 phase of the counter can be adjusted to the phase of the case where the relative position between the CTL head and the CTL head is shifted to -1%/-&. Therefore, in this example, no matter what phase the CTL/4 pulse Pal is,
At the start of tracing the recording track, the rotating magnetic head (6
m) = (6b) can be positioned at the center of the recording track, and dynamic fist tracking can be performed reliably.

In addition, in still playback mode, slow playback, double speed playback mode, etc., Qi is terminal II! Since SK is not supplied, the contents of latch @0 are held.

This rounding allows the phase of the count output of the counter to match the normal phase, no matter what phase the 4 s CTL 14 pulse has in these cases.Hence,
Dynamic tracking can be performed reliably.

Further, the count output of the counter is transferred to the subsequent counter in a predetermined manner. The subsequent operations are the same as those in the example in Figure 8], and as described above without elaboration, according to the example in Figure 10, the rotating magnetic head (6 m), (
sb) and the cTL head (9), and performs counting by timing according to the cTL pulse Pet K to form the expected voltage. It is varied based on the Therefore, in this example, the rotating magnetic head (6m), (6b
) and the cTL head (9) are misaligned,
Rotating magnetic head (6m).

When (6b) starts tracing one sickle track, they can be positioned exactly at the center of the recording track, and dynamic tracking can be performed reliably.

By the way, in the VTR made in this way, magnetic chi! Set the address of each track of αQ to cTLz4rusPctf
I have decided to count, but when I try to edit using this VTRi, for example, when I decide on LFI Collection I India in slow mode, the nth track and the (n+1)th track The address O on the magnetic head fQo corresponding between the center between the th tracks and the (n+1)th track corresponds to the nth track, so the magnetic head is The reproduced image of the rounded real monitor to be traced is the (m+
1) It becomes the track #@O, and at this time, when the editing point is determined for the playback image on the t monitor, the track to be edited is the (desired + 1)th track, but it is actually edited. This was the No. 10) rack, which had the drawback of causing errors in editing.

In view of this point, the present invention is designed to avoid the above-mentioned drawbacks.

Hereinafter, an embodiment of the magnetic arrangement reproducing apparatus of the present invention will be described with reference to FIGS. 12, 13, and 14.
In FIG. 12, parts corresponding to those in FIG. 10 are given the same reference numerals, and detailed explanation thereof will be omitted. In FIG. 12, the preset value of the counter that is the editing point and the magnetic head! II! IIK compares the output signal from the counter corresponding to the track to be played, and only when the counter preset (29) is greater than the output signal from the counter,
A correction signal for shifting the magnetic head by one track is added to the output signal from the counter so that the editing point always matches the track being reproduced, that is, the image.

That is, the output signal from the latch circuit that generates and supplies all the preset values of the counter is supplied to one input terminal of the comparator circuit, and the output signal from the counter is supplied to the other input terminal of the comparator circuit. At the same time, it is supplied to the digital-to-analog converter (to) via the 1 adder circuit. Only when the output signal from the comparison circuit latch circuit υ shows a larger value than the output signal from the counter, the comparison output is used as a comparison output between one track ((l1m) and (llb) with the opposite polarity to the output signal from the counter. ) A correction signal is generated to shift the magnetic head. The comparison output from the comparison circuit (2) is then supplied to the addition circuit (-) via the switch circuit (@). This switch circuit @ is turned on when the VTR is in slow mode.

The rest of the structure is the same as that shown in FIG. 10.

(30) According to this configuration, in the slow mode, the flim-th track (l1m) and this flim-th rack (l1m)
l1m) and (m+1)th rack [0) (11,,)
During the period TfKTo corresponding to the center T@, the output signal from the latch circuit ■ indicates the reference voltage Ov,
The output signal from the counter shows a positive voltage according to the length of the arrow ←η or ) in Fig. 13, and therefore, the comparator circuit ■
does not generate a correction signal as its comparative output, and the output signal from the counter is sent to the sott digital-to-analog converter (
To) K is supplied, and the magnetic head moves to the track (l1m) t
) to race.

Then, the center 〒e of the track (l1m) of @m I 'H and the (m+1)th track (11n+,) and the $1 (+a+1)th track (11n+,)
In the period Tb corresponding to the latch circuit el
The output signal from υ indicates the reference voltage Ov, and the O output signal from the counter indicates a negative voltage according to the length of the arrow or axis in FIG. The 13th signal has the opposite polarity to the output signal of
A correction signal indicating a nine positive voltage is generated depending on the length of the arrow - in the figure O, and this correction signal is supplied to the adder circuit - via the switch circuit @. In this manner, the output signal from the counter and the correction signal from the comparator circuit are added in the adder circuit MK, and the output signal from the adder circuit is supplied to the digital-to-analog converter. This situation is called the 13th
It is shown in FIG.

That is, arrows (93') and (94') in FIG.
The signals corresponding to the arrows (93') and (94') in Figure 14 are supplied to the digital-to-analog converter. It turns out. In this way, even when the center point is determined between the center Tc between the track (11t+) and the track (11n+,) and the track (11,th+,), the magnetic head moves to the track (lln)k) race.

Therefore, in the slow mode, when the edit 4 India is determined, the address entered as the edit 4 India always matches the image being reproduced.

As described above, according to the magnetic recording and reproducing apparatus of the present invention, in the slow mode, the grisset value of the counter @η, which becomes the edit I, and the output signal from the counter corresponding to the track that the magnetic head actually attempts to reproduce. are compared in the comparator circuit -, and only when the preset value of the counter ←η is larger than the output signal from the counter, the output signal from the counter
1b) Correction signal for shifting the magnetic head The signal is added in the adder circuit and supplied to the digital-to-analog exchanger to shift the magnetic head. and the track being played, i.e. iii
iig& can be made to always match, and errors will not occur in editing.

In the above embodiment, the slow mode was described as a special mode, but it goes without saying that the same can be done for other cage modes. Further, the present invention is not limited to the above-described embodiments, and it goes without saying that various other configurations tMRn can be obtained without departing from the gist of the present invention.

[Brief explanation of the drawing]

Figure 1 is a schematic plan view of a rotating drum to explain the magnetic recording/reproducing device; Figure 2 is a cutaway side view of part (33) of Figure 41; Figure 3 is a magnetic tape recording/reproduction device. Fig. 11, Fig. 4, Fig. 6, Fig. #c8, and Fig. 10 showing the turns are configuration diagrams for explaining the magnetic recording/reproducing mounting of the present invention; Fig. 5;
7, 9 and 11 are time charts for explaining the present invention, FIG. 12 is a configuration diagram showing one embodiment of the magnetic recording and reproducing apparatus of the present invention, and FIGS. 13 and 14 are time charts for explaining the present invention. It is a line diagram provided for explanation of a figure. (2) is a rotating magnetic head device, (61) and (6b) are Keo's rotating magnetic heads, (7 colors) and (7b) are respectively Nomomorph&, (9) is a control arm control head. , (11 breath) and (llb) are the recording tracks, (
4, - and ring are up/down counters, I70 is a digital-to-analog converter, (71m) and (71b)
41Iυ is a latch circuit, (2) is a comparison circuit, (2) is an adder circuit, and (2) is a switch circuit. Fig. 5 U U Fig. 7 Fig. 10 1 11b Route 11 1 Fig. 12

Claims (1)

[Claims] A rotating magnetic head is attached to an electro-mechanical transducer, and by applying a control voltage to the electro-mechanical transducer, the rotating magnetic head is deflected in a direction across tracks of the magnetic tape to accurately trace the tracks. When the rotating magnetic head attempts to trace between tracks, the rotating magnetic head is shifted so as to trace the track closer to tkK.
The magnetic recording/reproducing device is characterized in that, in a special program, the track traced by the rotating magnetic head is not changed until a master pulse of the control arm is obtained from the magnetic head for the control arm. Magnetic recording and reproducing device.