JP2558712B2 - Magnetic recording / reproducing device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus, particularly a rotary head type VTR.
In the VTR of the method of obtaining the tracking error signal for tape feeding from the reproduction signal from the video head, the first recording mode for recording the tape at the first feeding speed (hereinafter referred to as SP mode), The second recording mode (hereinafter referred to as recording at a speed half the first feed speed)
The present invention relates to automatic discrimination of a recording mode at the time of reproduction when there is an LP mode), and particularly to automatic discrimination of a recording mode at the time of intermittent feed slow motion reproduction using a dedicated head for still reproduction. In addition,
A method for automatically determining the recording mode in the normal reproduction mode is disclosed in Japanese Patent Laid-Open No. 60-131661.

2. Description of the Related Art The "8 mm video" standard VTR records a 4-frequency pilot signal for tracking control together with a video signal as a tracking control method, and at the time of reproduction, it reproduces from a track adjacent to both tracks. The level difference of the crosstalk component of the pilot signal is used as the tracking error signal. Hereinafter, a method for detecting a tracking error signal using a pilot signal will be described first.

In FIG. 11, A1, B1, A2, B2 ... Are recording tracks recorded by the A head and the B head. The arrow (a) indicates the scanning direction of the rotary head. On each recording track, pilot signals indicated by f1 to f4 are sequentially recorded for each field together with the video signal. The pilot signal is stored in the order of f1, f2, f3, f4, and f1 is recorded next to f4. Further, the type of the pilot signal is fixed and recorded in each one-field period. The frequency of the pilot signal is set to the value shown in Table 1, for example. In Table 1, fH indicates the frequency of the horizontal synchronizing signal in the video signal, and 6.5fH indicates 6.5 times the frequency of the horizontal synchronizing signal.

The frequency difference of the pilot signal between each recording track is 11th.
As shown in the figure, the frequency is fH or 3fH. And when the head scans the Ai (i = 1,2 ...) track,
The frequency difference between the pilot signal of the scanning track and the pilot signal recorded on the adjacent track on the right side of the drawing is always fH, and that on the left side is always 3fH. When the head scans the Bi (i = 1,2 ...) Track, the function is the opposite of the above, and the frequency difference of the pilot signal with the adjacent track on the right side is always 3fH, and that on the left side is always fH. .

Since the pilot signal is a relatively low frequency signal near 100 kHz, even if the head does not scan the adjacent track,
The pilot signal recorded on the adjacent track can be reproduced as a crosstalk signal. For example, the pilot signal obtained when the head performs on-track playback scanning of the A2 track is a composite signal of f3, f2, and f1, and the level is the largest at f3, and then f2 and f4 are reproduced at the same level. It When the head is slightly deviated from the track A2 to the track B2 side for reproduction scanning, the level of the obtained pilot signal decreases in the order of f3, f4, f2. On the contrary, when the head scans while being displaced toward the track B2 side, the obtained pilot signals become smaller in the order of f3, f2, and f4. Therefore, the difference signals fH and 3fH between the pilot signal on the main scanning track and each pilot signal recorded on both adjacent tracks
By separating and extracting each of them and comparing the reproduction levels of both signals, it is possible to know the amount and direction of deviation of the head from the main scanning track.

FIG. 12 is a block diagram of a reproducing circuit for obtaining a tracking error signal. In FIG. 11, a reproduction signal in which a video signal and a pilot signal are combined is input from a terminal 101. The circuit 102 is a low-pass filter, and extracts only the pilot signal from the reproduced signal being combined. The pilot signal obtained at this time is a composite signal of the main scanning track and the pilot signals recorded on both adjacent tracks. The circuit 103 is a balanced modulator, which multiplies the above-mentioned combined pilot signal by the reference signal supplied from the terminal 104. The reference signal supplied from the terminal 104 supplies a signal having the same frequency as the pilot signal recorded on the main scanning track. For example, in FIG. 11, when the head performs reproduction scanning on the track A2, the input signals to the balanced modulator 103 are the signals f2, f3, and f4, and the signal input from the terminal 104 is f3. Therefore, the output signal of the balanced modulator 103 is a signal of the frequency of the sum and difference of each signal of f2, f3, f4 and the signal of f3. Circuit 105 is a tuning amplifier that tunes the fH signal, and circuit 107 is a tuning amplifier that tunes the 3fH signal. Circuits 106 and 108 are amplitude detectors, and circuit 1
09 is a level comparator. Therefore, each pilot signal taken out as a crosstalk signal from both adjacent tracks is taken out as a difference signal from the pilot signal recorded on the main scanning track, and then its level is detected by the level comparator 109. A signal corresponding to the difference is taken out at the terminal 11. With respect to the signal obtained at the terminal 110, when the reproduction level of fH is higher than the reproduction level of 3fH, a (+) potential corresponding to the level difference is extracted, and in the opposite case, a (-) potential is extracted. Since the signal taken out at the terminal 110 includes information on the head track deviation amount and the deviation direction, it can be used as a tracking error signal. However, a tracking error signal that is actually suitable for practical use requires further processing. This is because, as is clear from FIG. 11, the relationship between the head deviation direction and the multiplication output (fH or 3fH) obtained at that time is opposite to each other in the Ai track and the Bi track. Therefore, by using the analog inverter 111 and the switch 112, the head is
The signal at the terminal 110 may be inverted in analog at the time of scanning the track and at the time of scanning the Bi track. That is, the switch 112 is connected to the terminal 110 when scanning the Ai track, and is connected to the output of the analog inverter 111 when scanning the Bi track. This can be dealt with by switching depending on whether the pilot signal name is odd or even. As a result, the output signal of the terminal 114 is always (+) when the head shifts to the right from the track to be scanned, and always (-) when the head shifts to the left, regardless of the Ai and Bi tracks. The potential of appears. Therefore, if the capstan motor is controlled by using the signal obtained at the terminal 114, the head can always be scanned on-track on the main scanning track.

The above is the outline of the method for obtaining the tracking error signal by using the pilot signals of four frequencies.

Next, a method of intermittent feed slow motion reproduction in 8 mm video will be described. In order to realize the intermittent feed slow motion reproduction, one or more new reproducing heads are required for still image reproduction. Hereinafter, the intermittent feed slow motion reproduction using three heddles will be described. Fifth
The figure is a timing waveform diagram showing a method of intermittent feed slow motion reproduction in 8 mm video. Further, FIG. 6 is a diagram showing the same operation on the recording pattern of the tape. First, assume that the tape is stopped. This state
Continue until head scanning of A1 and B1. At this time, since the track to be scanned does not change, the pilot signal of the track remains, for example, f1. In FIG. 6, the head scans from the lower right to the upper left. At this time, the tracking error signal has a sawtooth waveform that repeatedly changes from the state of advancing 0.5 track pitch to the state of delaying 0.5 track pitch for each head scan. The tracking error at the center of the track is on track. At this time, the output of the head becomes maximum at the center of scanning and slightly lowers at the beginning and end of scanning. However, if the width of the head is set wider than the track pitch, a decrease in output can be prevented, so there is no practical problem.

Next, the tape feed is started in the A2 head scan.
That is, the motor is started near the center of A2 scanning. The target speed of the motor is the same as the recording speed. That is, the tape feeding speed becomes 1 × speed from the middle of the scan A2. In FIG. 6, the head scans from the lower right to the center in the same way as when stopped, and scans from the center parallel to the track. The tracking error signal at this time becomes flat from the middle of the scan A2. Moreover, the tracking error signal is almost equal to the on-track value because it is sent from the on-track state at 1 × speed. Therefore, the head output can maintain the maximum output state after the motor is started.

Next, also in the scan of B2, if the tape feed speed is set to 1 × speed, the head scans the adjacent track, so that the pilot signal used is f2. In FIG. 6, scanning is performed in parallel with the track. The tracking error signal obtained at this time becomes flat as in the previous scan. The head output maintains the maximum output state.

Next, in the head scan A3, the tape advances one track, so that the pilot signal uses f3. Now, in the scan of A3, the tape feed is stopped at about the center of the scan. That is, the brake is applied at about the center of the scan. As a result, the motor can be stopped suddenly. In FIG. 6, the head scans from below the center of the track to the center of the track parallel to the track, and from there,
Scan toward upper left. The tracking error signal has a sawtooth waveform from the flat state until then, similar to the scanning of A1 and B2. That is, the tracking error signal starts to be delayed from the center of A3 and is delayed by 0.5 track pitch at the end of scanning.

The scanning after the next B3 is stopped, the pilot signal used is f3, the tracking error signal becomes a sawtooth waveform similar to A1, B1, the output of the head becomes the maximum at the center of the scanning, and the beginning of the scanning A little lower at the end.
In FIG. 6, the head corresponds to scanning from the lower right to the upper left. Since the 8 mm video is recorded in azimuth, it is necessary to select the reproducing head according to the azimuth of the track to be scanned, but this is publicly known and the description thereof is omitted.

By the way, when an actual tape is reproduced, the tape is not always stopped at the same place due to variations in the starting characteristics of the motor and variations in the mechanical accuracy of the device. Therefore, it is necessary to apply tracking control. That is, the tracking error signal is checked in the scan B2, and if the tape is in the advanced state, the brake start timing is advanced, and if it is in the delayed state, the brake start timing is delayed. For example, if the tracking error signal is delayed by 0.1 track pitch, the brake start timing may be delayed by 0.1 head scanning period. As a result, the tape can always be stopped at the same position.

Problems to be Solved by the Invention Now, in the intermittent feed slow motion reproduction described in the conventional example, it is assumed that the tape feed speed at the time of recording and the tape feed speed at the time of intermittent feed match. It was made up. However, when the recording modes are different, it is difficult to realize good intermittent tape feed slow motion reproduction. First, a tracking error signal when the head causes a large track deviation will be described.

FIG. 13 is a diagram showing the relationship between the track deviation and the tracking error signal. That is, when the track deviation is within ± 1 track, a normal tracking error signal is obtained, but if there is more track deviation, the change in the tracking error signal is reversed, and if the track deviation is ± 2 tracks, the on-track error occurs. Will be the same value as. However, since the polarities of changes in the tracking error signal are opposite, tracking control is not performed in this state. Even in the slow motion reproduction described above, control is applied in the direction in which tracking is deviated. Therefore, when the track is deviated by ± 2 tracks, it takes a long time to perform on-track.

Hereinafter, this phenomenon will be described with reference to the drawings. Figure 7 shows
FIG. 7 is a timing waveform chart when the tape recorded in SP mode is subjected to intermittent feed slow motion reproduction in LP mode. FIG. 8 is a pattern diagram showing the head scanning locus at that time. LP tape recorded in SP mode
Playing in mode is equivalent to playing at a feed rate of 1/2. First, it is assumed that the tape running is stopped in the head scanning up to (C1). Therefore, the scanning locus of the head is as shown in (C1) of FIG. The stop position of the tape at this time is in the on-track state. (For the method of setting the tape position at the time of stop to the on-track state, see, for example, Japanese Patent Application No. 61-
266975 etc. Therefore, if the pilot signal of the track to be reproduced is f1, the tracking error signal and the head reproduction output signal at that time have signal waveforms shown in (C1) of FIG. Now, in the next head scan (D1), the tape is sent at a speed ratio of 1/2 in the latter half of the scan start. Also in this head scanning, the pilot signal of the target track is f1. Therefore, the head scanning locus is indicated by the arrow (D
It becomes like 1). Therefore, the tracking error signal and the head reproduction output signal at that time have signal waveforms as shown in the period (D1) in FIG. In the next head scanning (C2), since the tape is fed at a constant speed at a speed ratio of 1/2, the head scanning locus is as shown by the arrow (C2) in FIG. The pilot signal of the track to be reproduced at this time is f2. However, in reality, the head scans between the track f1 and the track f2. Therefore, the tracking error signal and the head reproduction output signal at that time have signal waveforms shown in the period (C2) in FIG. Further, in the next head scanning (D2), since the tape feeding is stopped in the latter half of the operation, the head scanning locus becomes as shown in (D2).
At this time, the track to be played is the track in which f3 is stored. However, the head scans the track on which f2 is recorded. Therefore, the tracking error signal and the head reproduction output signal at that time have signal waveforms as shown in FIG. That is, the tracking error signal shows a large delay state, and the reproduction output cannot be sufficiently obtained. Since the tape is stopped in the next head scan, the head scan locus becomes as shown in (C3). Therefore, the tracking error signal and the head reproduction output signal at that time have signal waveforms as shown in FIG. As a result, the operation that should have sent two tracks is that only one track has been sent. Then, depending on the result of sending, the stop position is not the on-track position, and noiseless slow motion reproduction becomes impossible. The above is the phenomenon when the tape recorded in SP mode is played in intermittent slow motion mode in LP mode.

FIG. 9 is a pattern diagram showing the head scanning locus when the tape recorded in the LP mode is reproduced in the SP mode, and FIG. 10 shows the tracking error signal and the head reproduction output in that case. It is a timing waveform diagram.
First, it is assumed that the tape feed is stopped during the period until the head scan (E1) and that the stop position is on-track with respect to the track on which the pilot signal f1 is recorded. Therefore, the head scanning locus at that time is as shown by the arrow (E1) in FIG.
The tracking error signal and the output of the reproducing head at that time have signal waveforms as in the period (E1) in FIG. Next, in the head scanning (G1), when the tape is started in the middle of the head scanning and the tape is moved at a double speed ratio, the head scanning locus becomes as shown by the arrow (G1) in FIG. Become. At this time, since the pilot signal of the track to be reproduced is f1, the tracking error signal and the reproducing head output that are obtained are the period (G1) in FIG.
The signal waveform looks like. Further, in the next head scanning period (E2), the tape feeding is performed at double speed, so that the head scanning locus becomes a locus as indicated by an arrow (E2) in FIG. Since the pilot signal name of the track to be scanned at this time is f2, the obtained tracking error signal and head reproduction output are as shown in the head scanning period (E2) in FIG. It is in the advanced state and the reproduction output cannot be obtained sufficiently.
Now, at this time, the start timing of the brake is determined based on the tracking error signal, so
This will greatly accelerate the start of braking. By the way, in the next head scanning period (G2), the brake is operated to stop the tape feeding. The head scanning locus at this time is as shown by the arrow (G2) in FIG. Further, since the name of the pilot signal of the track to be scanned at this time is f3, the obtained tracking error signal and reproducing head output have the signal waveform shown in the head scanning period (G2) in FIG. During the next head scanning period (E3), the tape feed is stopped. The head scanning locus at this time is as shown by an arrow (E3) in FIG. The pilot signal name of the track to be scanned at this time is f3. Therefore, the tracking error signal and the head reproduction output at this time are as in the head scanning period (E3) in FIG. That is, the track position is shifted by two tracks, and the stop position is slightly delayed. In this way, when the tape recorded in the LP mode is subjected to the intermittent feed slow motion playback in the SP mode, the head playback output cannot be obtained during the feeding period, so noiseless slow motion playback cannot be realized. Therefore, it is necessary to determine the recording mode even in the intermittent feed slow motion reproduction.

An object of the present invention is to provide a method for discriminating a recording mode, which is effective even in intermittent feed slow motion reproduction.

Means for Solving Problems In order to solve the conventional problems, the present invention uses a storage means to detect and store a tracking error when the tape is stopped, and to detect the tracking error when reproducing in SP mode. Determine if there is a two-track deviation from the error signal,
If it is determined from the result of the determination that there is a two-track shift, a means for switching to the LP mode is provided, and when reproducing in the LP mode, it is determined whether the stop position is always one track delayed, A means for switching to the SP mode is provided when the one-track delay state is repeated.

Function The microcomputer checks whether or not the tracking error signal at the time of stopping the tape running in the intermittent slow motion reproduction in the SP mode has changed from the delayed state to the advanced state with respect to the head scanning. As a result of examination, if such changes are repeatedly occurring,
Switch the playback mode to LP mode. In addition, check whether the tracking error signal when the tape running is stopped in the LP mode intermittent feed slow motion playback is delayed or advanced. As a result of the examination, if the delayed state of almost one track is repeated, the reproduction mode is switched to the SP mode. As a result, it is possible to discriminate the recording mode in the intermittent feed slow motion reproduction in both the SP mode and the LP mode.

Embodiment 4 FIG. 4 is a circuit block diagram showing the overall construction of an embodiment of the present invention. That is, the reproduction signal obtained from the magnetic pad 1 is sent to the video signal reproduction circuit 3 and the tracking error signal detection circuit 4 via the amplifier 2. The video signal reproduction circuit 3 processes the reproduction signal and outputs it as a video signal. On the other hand, the tracking error signal detection circuit 4 is a circuit for obtaining the tracking error signal from the reproduced signal, and the principle thereof is as described above. The tracking error signal obtained by the tracking error signal 4 is sent to the microcomputer 5. The microcomputer 5 reads the tracking error signal and the head scan switching signal and outputs various control commands for performing slow motion reproduction. The commands include a selection signal of the reference pilot signal to the tracking error signal detection circuit 4, and a speed command / brake command to the speed control circuit 6 of the capstan motor 8. The speed control circuit 6 of the capstan motor 8 inputs the rotation detection signal obtained from the rotation detector 9 of the capstan, and outputs a drive command for controlling the rotation speed of the capstan motor 8 to a constant value. It is sent to the capstan motor 8 via.

FIGS. 1, 2, and 3 are flowcharts showing the processing contents of the microcomputer 5 in FIG. 4, FIG. 1 is a schematic flowchart, and FIGS. 2 and 3 are tape running stop. 7 is a flowchart showing a method of checking the tracking error signal at the time to determine the recording mode of SP / LP.

FIG. 1 is a flowchart showing an outline of the processing of the microcomputer 5. This processing is performed at regular intervals. For example, a timer interrupt or the like may be used to perform this processing for each timer interrupt. First,
In process 21, the number of timer interrupts is checked.
Then, depending on the result of the check, the process branches to the processes 22, 23, 24 and 25. First, if the capstan motor is being accelerated, the process branches to step 22, and if the capstan motor is being sent at a constant speed, the process branches to step 23. If the brake is being operated, the process branches to Process 24, and if it is stopped, the process is processed.
Branch to 25. If the vehicle is accelerating, in step 22, an acceleration command is output to the capstan motor. Then, the process is terminated and the process waits until the next timer interrupt. If it is feeding at a constant speed, the process proceeds to step 23, and a command for rotating the capstan motor at a constant speed at 1 × speed is output. And
Proceeding to process 26, it is checked whether or not it is the timing for calculating the brake start timing. If it is not the calculation timing, the processing is completed and the time until the next timer interrupt is awaited. If it is the calculation timing, the process proceeds to processing 27 and the brake start timing is calculated from the tracking error signal. When the process 27 is completed, the process waits until the next timer interrupt. If the timing is to activate the brake, the brake command for the capstan motor is output in process 24, and the process waits until the next timer interrupt. If the capstan motor is stopped, process 25
To go to step 28, output a capstan motor stop command, go to step 29 if SP, go to step 29 if LP
Proceed to step 30, and perform processing to determine the SP / LP recording mode. The processing method will be described with reference to FIGS. 2 and 3, respectively. When this process is completed, it waits until the next timer interrupt. The above is the contents of the processing shown in FIG.

FIG. 2 is a process for checking whether or not the tape recorded in the SP mode shown in the process 29 of FIG. 1 is in the SP mode, and is for checking the tracking error signal after the tape feeding is stopped. is there. In FIG. 2, first, in process 31, it is determined whether or not it is the first field after brake release. If it is the first field, the process proceeds to process 32. If not, the process is terminated and the next timer waits. Next, in process 32, it is checked whether or not the current time is a time when 1/3 cycle has elapsed from the start of head scanning. If it is the time when 1/3 cycle has elapsed, the process proceeds to step 39, and if not, the process proceeds to step 33. In step 39, the tracking error signal value at that time is written in the memory M1. And the second
After the processing in the figure is completed, the next timer interrupt waiting state is entered.
On the other hand, in the process 33, it is checked whether or not the current time is 2/3 cycles after the head scanning is started. If it is the time when the 2/3 cycle has elapsed, the process proceeds to step 34, and if not, the process of FIG. 2 is terminated and the next timer interrupt waiting state is entered. In process 34, the tracking error signal value is written in the memory M2, and the process proceeds to process 35. In process 35, two memories M1
And the value of M2 are compared. If M2> M1 as a result of the comparison, the process proceeds to step 36, and if not, the process proceeds to step 40. In process 36, the SP / LP detection increments the counter for checking that it is abnormal. Then, the process proceeds to step 37, and it is checked whether the counter overflows. If it has not overflowed, the processing of FIG. 2 is finished and the next timer is reached, and if it has overflowed, it proceeds to processing 38,
The playback mode is switched to the LP mode and the process ends. On the other hand, in the case of proceeding to the processing 40, the counter is decremented by 1 and the processing of FIG. 2 is finished, and the next timer interrupt waiting state is entered.

FIG. 3 is a flow chart of processing for checking whether or not the tape currently being reproduced is LP in the LP mode. First, in process 41, it is checked whether or not the current field is the first field after releasing the brake, and if so, the process proceeds to process 42, and if not, the process of FIG. 3 is finished and the next timer waits. In process 42, check if the time of Genzai is the time when 1/2 field has elapsed,
If it is not that time, the processing of FIG. 3 is finished and the next timer waits, and if it is that time, processing 45 is entered. In process 45, it is checked whether or not the current tracking error signal is greatly delayed. As a result, if it is in the state of being significantly delayed, the process proceeds to process 44, and if not, the process proceeds to process 47. In the process 44, the LP mode is set to +1 for the counter for checking for an abnormality. Then, the processing proceeds to processing 45, and it is checked whether or not the counter overflows. If it has not overflowed, the processing of FIG. 3 is finished and the next timer is awaited. If it has overflowed, the process proceeds to step 46, and the reproduction mode is switched to the SP mode. Then, the processing of FIG. 3 is ended. Meanwhile, processing in processing 45
If the process branches to 47, it is normal. Therefore, the counter for checking the above is decremented by 1, the process of FIG. 3 is finished, and the next timer is waited.

According to the above flow chart, it is possible to determine whether the SP mode or the LP mode is set even during the intermittent feed slow motion reproduction.

In the description of this embodiment, the tape stop position at the time of starting the tape feeding has been described as the on-track state. However, regarding the method of setting the first stop position to the on-track state, JP-A-58-123238. Are described in. Also, as a method of checking the changing direction of the tracking error signal, the tracking error signal of 1/3 cycle and the tracking error signal of 2/3 cycle from the start of the head operation are used. It is needless to say that can be used.

EFFECTS OF THE INVENTION As described above, the present invention can provide a method of discriminating a recording mode in intermittent tape feed slow motion reproduction, and does not require normal reproduction as in the conventional case.

In this embodiment, the case where the specific change of the tracking error signal repeatedly occurs so as not to be affected by noise or the like has been described, but according to the principle of the present invention, only one intermittent feed is performed. It goes without saying that it is possible with.

Further, in the present embodiment, the microcomputer is used to detect the direction of change of the tracking error signal, output the intermittent feed command of the capstan motor, and output the command to switch the reference pilot signal. Kaisho
As shown in JP 61-178762, there is a method of performing speed control of a capstan motor, and tracking control using a tracking error signal by using an arithmetic circuit. The effect of the present invention is great because it can be realized and a new arithmetic circuit is not required.

[Brief description of drawings]

FIG. 1 is a flowchart showing the processing flow of the microcomputer in FIG. 2 and FIG.
FIG. 7 is a circuit block diagram showing the configuration of an embodiment of the present invention, FIG. 5 is a timing waveform diagram showing a method of intermittent slow motion reproduction in 8 mm video, FIG. 6 is the same pattern diagram, and FIG. 7 is SP. Fig. 8 is a timing waveform diagram when the tape recorded in the mode is played in the intermittent slow motion mode in the LP mode, Fig. 8 is the same putter diagram, and Fig. 9 is the intermittent feed slow speed in the tape recorded in the LP mode. Timing waveform diagram when motion reproduction is performed, FIG. 10 is the same pattern diagram, FIG. 11 is an explanatory diagram showing a recording pattern of a pilot signal in 8 mm video, and FIG. 12 is a configuration of a tracking error signal detection circuit. And FIG. 13 is a block diagram showing the relationship between the track deviation and the tracking error signal. 1 ... Magnetic head, 4 ... Tracking error signal detection circuit, 5 ... Microcomputer, 6 ... Capstan motor speed control circuit.

Claims (1)

(57) [Claims] A tracking control pilot signal (f1, f2, f2 and f4) having four kinds of frequencies is provided as a discontinuous magnetization locus on a magnetic tape by a rotary head for each discontinuous locus.
f1 → f2 → f3 → f4 → f1 → ... to switch cyclically and record / playback together with the video signal, and at the time of playback, the level of the crosstalk pilot signal from the tracks adjacent to the track to be played A first recording / reproducing mode in which a tracking error is obtained by the difference and is reproduced, and recording / reproducing is performed at a first tape feeding speed, and a second recording / reproducing mode in which recording / reproducing is performed at a speed half the first tape feeding speed. It has a recording and playback mode, and in each mode,
In a magnetic recording / reproducing apparatus that performs slow motion reproduction by repeating tape feed stop and constant speed feed, a means for detecting and storing a tracking error signal when the magnetic tape is stopped and a tracking error signal detected and stored It has means for judging whether or not the change of the tracking error signal due to the head scanning has changed from the delayed state to the advanced state, and when the tape feeding is stopped during the slow motion reproduction in the first recording / reproducing mode, the detection is performed. The first recording / reproducing mode is switched to the second recording / reproducing mode according to the result of the tracking error signal changing direction determination means, and when the tape feeding is stopped during slow motion reproduction in the second recording / reproducing mode, Check that the detected tracking error signal is delayed. When you issue a magnetic recording and reproducing apparatus, characterized in that said second recording mode, switches to the first recording reproduction mode.