JPS6339967B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording device capable of continuously recording digital signals.

The inventor of the present invention prototyped an apparatus for continuously recording data on a magnetic tape having multiple tracks by switching tracks. In this device, data is recorded on the first track by forward running, then data is recorded on the second track by reverse running, and data is recorded again on the third track by forward running. By the way, when recording data with a general magnetic tape device of unidirectional recording, it may be necessary to return the head scanning position by reverse running in order to correct error data or the like. Such a situation naturally occurs in the case of a continuous recording method using track switching. However, in the continuous recording method of track switching, data is recorded on the first track by forward running and then data is recorded on the second track by reverse running. The control must be differentiated from the command to run in reverse. Therefore, management of the tape running direction becomes complicated.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a track switching type digital magnetic recording apparatus in which the tape running direction can be easily controlled.

To achieve the above object, the present invention causes a magnetic tape having a plurality of tracks to run in a first direction in response to a drive signal in a first direction obtained from a first drive signal forming circuit described later, a magnetic tape drive device for causing the magnetic tape to travel in a second direction in response to a drive signal in a second direction obtained from a second drive signal forming circuit to be described later; and detecting an end of a recording/reproducing area of the magnetic tape. A magnetic head element used for recording and a magnetic head element used for reproduction are provided corresponding to each track of the magnetic tape, and a plurality of the magnetic head elements are integrated. a combination magnetic head; a recording-side magnetic head element selection circuit for selectively coupling the magnetic head elements used for the recording of each track to a common recording signal supply line; and a magnetic head element selection circuit for selectively coupling the magnetic head elements used for the recording of each track to a common recording signal supply line; A reproduction side magnetic head element selection circuit for selectively coupling the head elements to a common reproduction signal transmission line; and a reproduction side magnetic head element selection circuit for selectively coupling the head elements to a common reproduction signal transmission line; generating a tape running direction control signal whose other level corresponds to a tape reverse feed control signal; and one level of the two levels consisting of a high level and a low level corresponding to a tape drive signal, and the other level corresponds to a tape drive signal. generates a tape drive/stop signal whose level corresponds to the tape stop signal, and selects one of two levels consisting of a high level and a low level based on the tape end detection signal obtained from the tape end detection device. In order to generate a track signal in which one level corresponds to an odd track signal and the other level to an even track signal, and to record data on a track different from the track before reversal after reversing the tape running direction. a tape running and magnetic head element selection control circuit for generating a magnetic head element selection control signal for selecting a magnetic head element of another track based on the tape end detection signal, the tape running direction control signal and the track signal; is input, and during a period when the normal tape feed control signal and the odd track signal are input, the running control signal in the first direction is generated, and the normal tape feed control signal and the even track signal are input. generates a travel control signal in the second direction during a period when the reverse feed control signal and the odd track signal are input; a logic circuit that generates a running control signal in the first direction during a period when the reverse feed control signal and the even track signal are input; and an output of the logic circuit and the tape drive/stop signal. a first drive signal forming circuit that generates the drive signal in the first direction during a period in which the tape drive signal is generated together with the travel control signal in the first direction; and the logic circuit. and the tape drive/stop signal, the second drive signal generates the drive signal in the second direction during the period in which the tape drive signal is generated together with the run control signal in the second direction. The present invention relates to a digital magnetic recording device comprising a drive signal forming circuit and a memory provided upstream of the recording side magnetic head element selection circuit and temporarily storing input data during at least a reversal period of the tape running direction.

According to the present invention, data is recorded on the first track while traveling in the first direction (forward direction), and data is recorded on the second track while traveling in the second direction (reverse direction). It is no longer necessary to supply different tape running direction control signals depending on the case. Therefore, when a control signal is generated by a CPU (central processing unit) or the like, it is sufficient to use the same control signal as for continuous tracks even when tracks are switched. This makes it easy to use the magnetic tape device via a magnetic tape control device such as a CPU.

Embodiments of the present invention will be described below with reference to the drawings.

In the cassette type digital magnetic recording and reproducing apparatus according to the embodiment of the present invention shown in FIG. 1, first and second reel motors 3 and 4 are coupled to first and second reel shafts 1 and 2, respectively. ing. Therefore, when the second reel motor 4 rotates the second reel 6 in the clockwise direction, the four-track magnetic tape 7 mounted on the first reel 5 and the second reel 6 shown in the illustration is It runs in a first direction (forward direction) shown by arrow 8, and runs in a second direction (reverse direction) shown by arrow 9 when the first reel motor 3 rotates the first reel 5 counterclockwise. do. The magnetic tape drive device of this embodiment is configured as a reel drive system, so it does not have a capstan motor or a pinch roller. Instead, the tape running speed detection roller 10 detects the tape running speed, and the motor drive control circuit 11 controls the reel motors 3 and 4 so that the tape running speed is constant.

The magnetic tape 7 has first, second, and
It has third and fourth tracks T ₁ , T ₂ , T ₃ , and T ₄ , and has a BOT marker 13 made of a through hole in the vicinity of the starting end of the magnetic region slightly to the left of the transparent tape portion 12 at the end of the tape. Furthermore, an EOT marker 15 formed by a through hole is provided in the vicinity of the end of the magnetic region slightly to the right of the transparent tape portion 14 at the end of the tape.

Since the magnetic tape 7 has four tracks as described above, the magnetic head 16 also has four recording head elements W ₁ , corresponding to the four tracks as shown in FIG.
W ₂ , W ₃ , W ₄ and four read head elements R ₁ , R ₂ ,
R ₃ , R ₄ , and a head element in the first track T ₁ .
W ₁ , R ₁ , head elements W ₂ , R ₂ on the second track T ₂ ,
The third track T ₃ includes head elements W ₃ , R ₃ and the fourth track T 3 .
Head elements W ₄ and R ₄ correspond to track T ₄ , respectively. That is, 4 tracks worth of dual gears 17
A combination magnetic head 16 is constructed by the above. Incidentally, in Fig. 2, if the arrow 18 is the forward direction and the arrow 19 is the reverse direction, then the first
In the track, a first recording head element W ₁ is arranged on the tape supply side in forward running, a first reproducing head element R ₁ is arranged on the tape winding side in forward running, and in the second track, the tape is disposed in reverse running. A second recording head element W ₂ on the supply side and a second reproducing head element on the tape winding side in reverse running.
R ₂ is arranged, and in the third track, a third recording head element W ₃ is placed on the tape supply side in forward running.
A third reproducing head element R ₃ is arranged on the tape winding side in forward running, a fourth recording head element W 4 is arranged on the tape supply side in reverse running in the fourth track, and a fourth recording head element W ₄ is arranged on the tape winding side in reverse running. A fourth reproducing head element _W4 is arranged at.

A magnetic head element is provided corresponding to each track of the magnetic tape 7, but signals are not recorded on each track simultaneously, but only on a selected track. That is, in FIG. 3, after recording from the right end to the left end of the first track _T1 , recording is then performed from the left end to the right end of the second track _T2 without providing a rewinding period. For this reason, a recording side magnetic head element selection circuit 21 is provided between the common recording signal transmission line 20 and the magnetic head 16. Further, a reproduction side magnetic head element selection circuit 23 is provided between the magnetic head 16 and the common reproduction output transmission line 22 in order to check the recording state on each track at the reproduction head of each track.

A common memory 25 and a common recording amplifier 26 are sequentially provided between the recording signal input terminal 24 and the recording side magnetic head element selection circuit 21, and the reproduction side magnetic head element selection circuit 23 and the reproduction output terminal 2
9, a common regenerative amplifier 27 and a common waveform shaping circuit 28 are sequentially provided.

Reference numeral 30 denotes a light source provided to configure the tape end detection device, and this light source 30 includes the tape 7.
The light receiving elements 31 are opposed to each other via. Accordingly
When the BOT marker 13 and the EOT marker 15 pass in front of the light receiving element 31, the light source 30 appears on the light receiving element 31.
light enters, and BOT or EOT markers can be detected. The tape end detection circuit 32 to which the light receiving element 31 is coupled amplifies and waveform-shapes the output of the light receiving element 31 to generate BOT and EOT detection signals.

Reference numeral 33 denotes a tape running and magnetic head element selection control circuit, which performs reversal control of the tape running direction based on the end detection signal of the tape end detection circuit 32, and also controls the recording side magnetic head element selection circuit 21 and the playback side magnetic head element selection circuit 21. It controls the magnetic head element selection circuit 23 and further controls the memory 25 so as to stop supplying recording data to the magnetic head element during the tape running reversal period. The recording side magnetic head element selection circuit 21 has first, second, third, and fourth magnetic head element selection circuits.
It has first, second, third, and fourth switches S ₁ , S ₂ , S ₃ , and S ₄ corresponding to the trucks, and the first to fourth switches S 1 to S 4 are the first to fourth switches S ₁ to _{S 4} . Fourth recording head element
They are connected to W ₁ to _{W 4} , respectively. Further, the reproduction side magnetic head element selection circuit 23 selects first, second, third, and fourth switches P ₁ , P 2 , P 3 , and P ₄ corresponding to the first, _second , _third , and fourth tracks. The first to fourth switches _P1 to _P4 are connected to the first to fourth read head elements _R1 to _R4 , respectively.

Tape running and magnetic head element selection control circuit 3
3 to the motor drive control circuit 11, the drive/stop control signal supply line 47 supplies a low level tape drive control signal and a high level stop control signal as shown in FIG. 6B. It sends out signals. The tape running direction control signal supply line 48 is a line that selectively supplies a high level normal feed control signal or a low level reverse feed control signal from the tape running and magnetic head selection control circuit 33. That is, as shown in FIG. 6A, in a normal recording state, a high level normal feed control signal is sent regardless of the actual running direction of the tape. This normal feed control signal corresponds to the forward run control signal in conventional single track recorders. Furthermore, the low-level reverse feed control signal shown by the chain line in FIG. This corresponds to a reverse travel control signal in a single track recording device.

Reference numeral 68 is a track signal supply line which supplies a low level odd track signal and a high level even track signal as shown in FIG. 6C obtained from the tape running and magnetic head element selection control circuit 33. be. As will become clear from the description below, this track signal becomes an odd track signal when recording on the first and third tracks in response to the detection of the EOT marker or BOT marker, and becomes an odd track signal when recording on the first and third tracks in response to detection of the EOT marker or BOT marker.
When recording on a track, it becomes an even track signal.

70 is a logic circuit for automatically inverting the running direction signal, which receives the tape running direction control signal on line 48 and the track signal on line 68;
A first direction (forward) running control signal is generated during a period when a normal tape feed control signal and an odd track signal are input, and a first direction (forward) running control signal is generated during a period when a normal tape feed control signal and an even track signal are input. generates a travel control signal in the second direction (reverse), and generates a travel control signal in the second direction during the period when the opposite feed control signal and the odd track signal are input, and A travel control signal in the first direction is generated during a period when an even track signal is input.

71 is a first drive signal forming circuit which responds to the output of the logic circuit 70 and the tape drive/stop signal on the line 46 inverted by the inverter 46;
The drive signal in the first direction is generated during a period when the tape drive signal is generated together with the travel control signal in the first direction.

72 is a second drive signal forming circuit, which generates a tape drive signal together with a running control signal in the second direction in response to the output of the logic circuit 70 and the tape drive/stop signal inverted by the inverter 46. The drive signal in the second direction is generated during the period when the drive signal is in the second direction.

In FIG. 4, which shows in detail the logic circuit 70, first and second drive signal forming circuits 71, 72, and motor drive control circuit 11 in FIG. One end is connected to the positive power supply terminal 35 via the servo amplifier circuit 34, and a transistor 36 is connected between the other end of one motor 3 and the common ground line, and the other end of the other motor 4 is connected to the common line. A transistor 37 is connected between
Furthermore, a back tension circuit 40 is connected between the other ends of the pair of motors 3, 4 and a common ground line via respective diodes 38, 39.

The back tension circuit 40 applies a necessary back tension voltage to the supply reel motor by controlling a transistor 42 connected between a point 41 on the cathode side of a pair of diodes 38 and 39 and a common line. , and the base of transistor 42 is coupled to the output of differential amplifier 43. One input terminal of the differential amplifier 43 is connected to a reference voltage circuit 44, and the other input terminal is connected to an output line of the servo amplifier circuit 34 via a resistive voltage divider circuit, and is also connected to a stop control circuit 45. ing. The stop control circuit 45 is an AND gate 6.
This circuit performs control to apply a strong back tension in response to a low level stop signal obtained from 7.

Reference numeral 69 is an exclusive OR circuit for configuring the logic circuit 70 in FIG. Diagram D
produces the output shown below.

49 is a first AND gate for configuring the first drive signal forming circuit 71 shown in FIG. A forward drive signal shown is formed and applied to the base of transistor 37. Therefore, if there is a high level output signal from the exclusive OR circuit 69 during the period _t0 to _t3 in FIG. 6, and at the same time there is a low level drive control signal on the line 47 as shown in FIG. 6B, A high level forward drive signal as shown in FIG. 6E is generated from the first AND gate 49, turning on the transistor 37. As a result, the motor 4 rotates to wind up the tape 7, and the tape runs forward.

One input terminal of the second AND gate 50 for configuring the second drive signal forming circuit 72 is connected to the exclusive OR circuit 69 via the inverter 51, and the other input terminal is connected to the exclusive OR circuit 69 via the inverter 46. Since the output terminal is connected to the base of the transistor 36, a low level signal is generated from the exclusive OR circuit 69 as shown at _t5 to _t8 in FIG. If a low-level drive control signal is generated as shown in Figure B, this second
A high level reverse drive signal shown in FIG. 6F is obtained from the AND gate 50 of the transistor 36.
is turned on. As a result, the reel motor 3 is driven to take up the tape, and the tape runs in reverse.

A reference voltage circuit 53 is connected to one input terminal of a differential amplifier 52 in the servo amplifier circuit 34,
A speed detection voltage is applied to the other input terminal, and an error output between the speed detection voltage and the reference is applied to the base of the servo control transistor 54. The speed detector 55 generates a frequency signal corresponding to the tape speed using the roller 10 shown in FIG.
7 into a voltage corresponding to the frequency (speed) and supplied to the differential amplifier 52. A start control circuit 58 is connected to the differential amplifier 52 for smooth start.

FIG. 5 shows the tape running and magnetic head element selection control circuit 33 of FIG. 1 in detail. This circuit 33 is generally included in the CPU, but
Shown in blocks for ease of understanding. The tape running direction control signal generation circuit 60 generates the signal shown in FIG. In the case of reverse feeding, a low level signal is generated.

The drive/stop control signal generation circuit 61 is connected to the line 5.
9, for example, when the EOT marker detection signal shown in FIG. 6H is applied, a high level stop signal is generated from time t ₃ to time t ₅ as shown in FIG. 6B, and a low level stop signal is generated after time t ₅ . It generates a drive signal. When the magnetic head element selection signal generation circuit 62 receives, for example, the EOT marker detection signal shown in FIG. 6H, it generates a signal for selecting the second track at time _t4 as shown in FIG. 6J, and A second flip-flop 64 is set to act as a latch;
This resets the other flip-flops 63, 65, and 66. The first to fourth flip-flops 63 to 66 are the first to fourth switches _S1 on the recording side.
~ _S4 and the first to fourth switches _P1 to _P4 on the playback side
Therefore, if the second flip-flop 64 is set now, this output will be inverted to a high level at time _t4 as shown in FIG. 6L, and
By turning on the switches _S2 and _P2 , recording and reproducing by the magnetic head elements _W2 and _R2 of the second track is started. The first flip-flop 63 is reset at time _t4 as shown in FIG. 6K, and the switch _S1
and P ₁ is turned off.

The OR gate 73, which receives the Q outputs of the second and fourth flip-flops 64 and 66, is used to form a track signal, and as shown in FIG. A high level signal is generated in response to even tracks.

Next, the handling method and operation of this device will be described.

Now, for example, t ₀ in Fig. 6 is controlled by external control.
If the drive/stop control signal generation circuit 61 generates a low level drive signal at this point, and at the same time the tape running direction control signal generation circuit 60 generates a high level normal feed control signal as shown in FIG. 6A. , the output of the first AND gate 49 in FIG. 4 becomes high level, and the transistor 37 is turned on. On the other hand, the output of second AND gate 50 is kept low and transistor 36 is kept off. As a result, the motor 4 is driven on the winding side, and the tape running speed reaches a predetermined speed after a predetermined time as shown in FIG. 6G. At this time, a diode 38 and a transistor 42 are connected to the tape supply side motor 3.
A low voltage is applied across it, acting as a back tension.

When tape running is started as described above, the BOT marker 13 shown in FIG. 3 is at t ₁ shown in FIG.
detected at the time. Since this is the first BOT marker detection, a first track selection signal is generated as shown in FIG. 6I based on this first BOT marker detection. That is, a signal for setting the first flip-flop 63 as a latch is generated from the magnetic head element selection signal generating circuit 62 of FIG. This sets the first flip-flop 63 as shown in FIG. 6K, and the latch output turns on switches S ₁ and P ₁ corresponding to the first track in FIG. Therefore, the common recording amplifier 26 is connected only to the recording magnetic head element _W1 of the first track, and the common reproducing amplifier 26 is connected only to the recording magnetic head element W1 of the first track.
7 is connected only to the read magnetic head element _R1 of the first track. After a desired period of time has elapsed from the time when the BOT marker was first detected, the first data block, second data block, etc. are sequentially recorded on the first track.

When the first EOT marker is detected at time t ₂ by continuing tape running, this
EOT detection signal is drive/stop control signal generation circuit 6
1 and a magnetic head element selection signal generation circuit 62, and various control signals are generated based on the EOT detection signal. For example, a high-level stop signal is generated as shown in FIG. 6B at time _t3 after the end of recording of the n-th data block recorded at the time of EOT detection. When a stop signal is generated during the period t ₃ to _{t 5} , the first and second
Since the outputs of the AND gates 49 and 50 become low level, the first and second transistors 36 and 37
is turned off. However, since the take-up motor 3 continues to rotate due to inertia, tape running does not stop immediately, but gradually comes to a stop. At this time, it is required to stop tape running in a short time and shift to reverse running in a short time for high-speed and continuous recording. Therefore, the present device is configured to use a reel drive system, and is also configured to apply a stop back tension voltage by the stop control circuit 45 to reverse the running direction in several tens of milliseconds. Therefore, in response to the stop signal at time _t3 , the output of the stop control circuit 45 becomes a low level state, and the buck tension circuit 40 applies a buck tension voltage stronger than that during normal running to the supply motor 3.

Also, after the recording of the nth data block is completed,
At time _t4 , a second track selection signal is generated as shown in FIG. 6J, thereby setting the second flip-flop 64 in FIG. 5, resetting the remaining flip-flops 63, 65, and 66, and Turn on switches S ₂ and P ₂ corresponding to track T ₂ . This enables recording and reproduction on the second track _T2 . Also, as shown in FIG. 6C, an even track signal is generated at time _t4 .

Thereafter, when a drive signal is generated at time t ₅ as shown in FIG. 6B, a second drive signal is generated as shown in FIG. 6F.
A reverse drive signal is generated from the AND gate 50,
The first transistor 36 is turned on and the motor 3
Since a voltage higher than the buck tension voltage is applied to the tape 7, the motor 3 is driven on the take-up side, and the tape 7 runs in the reverse direction shown by the arrow 9 in FIG. When the tape starts running smoothly and rapidly in reverse under the control of the start control circuit 58, the EOT marker 15 is detected again at time _t6 . However, in this case, this EOT detection signal is not used as a tape end detection signal, but is used as a tape start end detection signal. Then, after a predetermined time from the time t ₆ when the EOT marker was detected, n+1
Enter the recording of the th data block. Outage period t ₃
Of course, recording data may also be sent to the input terminal 24 at ~ _t5 . However, the memory 25 temporarily stores the data during the stop period _t3 to _t5 and supplies it to the magnetic head element _W2 when it becomes possible to record the data on the second track _T2 .

As mentioned above, data was recorded on the second track T ₂ while driving in reverse, and the second BOT marker 13 was recorded.
When detected at _t7 , the track and tape running direction are switched in the same manner as when the EOT marker 15 is detected at _t2 , and the third track _T3 is scanned in forward running. After that, the second
When the EOT marker 15 is detected, the fourth track _T4 is scanned in the reverse direction.

If it is desired to reverse feed for error correction or the like, the CPU generates a low level signal on line 48 as indicated by a chain line in FIG. 6A. As a result, the tape runs in the opposite direction to the normal recording running direction.

As is clear from the above, data is recorded on the first and third tracks _T1 and _T3 by forward running, and data is recorded on the second and fourth tracks _T2 and _T4 by reverse running. Even if a normal feed control signal is supplied in both directions, the exclusive OR circuit 69 automatically reverses the tape running direction.
It becomes possible to perform desired recording. Therefore,
It becomes possible to form control signals by the CPU, etc. in the same way as in the case of recording a single running direction, making it easier to use.

In addition, this device can reverse the tape running direction several times.
It is possible to perform this in 10 ms and to switch the magnetic head element in several μS. Therefore, compared to the conventional method, which requires 30 seconds to several minutes to rewind the tape and then switch tracks, it is possible to significantly shorten the recording time and facilitate continuous recording.

In addition, since the tape 7 is driven by a reel instead of being driven by a capstan and is rapidly stopped by applying a strong back tension when stopping, the time for reversing the running direction is shortened and the capacity of the memory 25 can be reduced. It is possible.

In addition, since a large number of magnetic head elements are combined to form a combination magnetic head 16 as shown in FIG. 2, and two magnetic head elements react to each track, it is possible to easily switch tracks. , it is possible to check the recording state using the reproducing magnetic head elements R ₁ to R ₄ and record accurately.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above-mentioned embodiment.
It is also deformable. For example, the tape running direction and magnetic head element selection control circuit 33 may be configured by a CPU (central processing unit) of a computer. Further, in the embodiment, the BOT marker and the EOT marker are detected by the common light source 30 and the light receiving element 31, but for example, a detection section is provided on both the supply reel side and the take-up reel side, and the EOT marker and the BOT marker
The markers may also be detected independently. In addition, in the example, EOT marker 15 or BOT marker 1
3 is detected, the running direction is not immediately reversed,
Although the direction of travel is reversed after the completion of data block writing, the direction of travel may be reversed immediately. Furthermore, the output switching of the track selection flip-flops 63 and 64 may not be performed at time _t4 , but may be performed, for example, at time _t3 or _t5 . Of course, the arrangement of track numbers may also be changed. It is also applicable to cases where a magnetic tape with less than or more than 4 tracks is used. In the embodiment, there are four recording head elements W ₁ to W ₄ and four reproduction head elements R _{1 to R 4} .
Although _R4 is provided, all the head elements, that is, all eight magnetic head elements, may be used as recording and reproducing head elements. If it is used as a recording/reproducing head in this way, it will be possible to record four tracks in parallel as needed.
Alternatively, it can also be used for recording on another track after rewinding.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a digital magnetic recording and reproducing apparatus according to one embodiment of the present invention, and FIG.
3 is an explanatory enlarged plan view of the magnetic tape shown in FIG. 1, and FIG. 4 shows the logic circuit shown in FIG. 1, the first and second drive signal forming circuits, and the motor drive. 5 is a block diagram showing the tape running and magnetic head element selection control circuit of FIG. 1, and FIG. 6 is a circuit diagram showing the control circuit in detail.
FIG. 6 is a waveform diagram showing the states of points A to L in FIG. 5 and FIG. In the symbols used in the drawings, 3 is the first reel motor, 4 is the second reel motor, and 7 is the first reel motor.
11 is a magnetic tape, 11 is a motor drive control circuit, and 13 is a magnetic tape.
15 is a BOT marker, 15 is an EOT marker, 16 is a magnetic head, 20 is a common recording signal transmission line, 21 is a recording side magnetic head element selection circuit, 22 is a common reproduction output transmission line, 23 is a reproduction side magnetic head element selection circuit, 25 is a memory, 32 is a tape end detection circuit, 33 is a tape running and magnetic head element selection control circuit, 69 is an exclusive OR circuit, 70 is a logic circuit, 71 is a first drive signal forming circuit, and 72 is a first drive signal forming circuit. 2
This is a drive signal forming circuit.

Claims (1)

[Scope of Claims] 1. A magnetic tape having a plurality of tracks is caused to run in a first direction in response to a drive signal in a first direction obtained from a first drive signal forming circuit (described later), and a magnetic tape drive device for causing the tape to run in a second direction in response to a drive signal in a second direction obtained from a drive signal forming circuit; and a tape drive device for detecting an end of a recording/reproducing area of the magnetic tape. A combination magnetic head in which an end detection device, a magnetic head element used for recording and a magnetic head element used for reproduction are provided corresponding to each track of the magnetic tape, and a plurality of the magnetic head elements are integrated. a recording side magnetic head element selection circuit for selectively coupling the magnetic head elements used for the recording of each track to a common recording signal supply line; and a common magnetic head element used for the reproduction of each track. a reproduction side magnetic head element selection circuit for selectively coupling to a reproduction signal transmission line of the magnetic head; and a reproduction side magnetic head element selection circuit for selectively coupling to a reproduction signal transmission line; A tape running direction control signal whose level corresponds to a tape reverse feed control signal is generated, and one level of two levels consisting of a high level and a low level corresponds to a tape drive signal, and the other level corresponds to a tape drive signal. Generates a tape drive/stop signal corresponding to the stop signal, and sets one of two levels consisting of a high level and a low level based on the tape end detection signal obtained from the tape end detection device. In order to generate a track signal in which one level corresponds to an odd track signal and the other level corresponds to an even track signal, and to record data on a track different from the track before reversal after the tape running direction is reversed, a tape running and magnetic head element selection control circuit that generates a magnetic head element selection control signal for selecting a magnetic head element of another track based on the detection signal; and a tape running direction control signal and the track signal as inputs. , generates the running control signal in the first direction during a period when the normal tape feed control signal and the odd track signal are input, and generates a running control signal in the first direction when the normal tape feed control signal and the even track signal are input. generates a travel control signal in the second direction during a period when the reverse feed control signal and the odd track signal are input; a logic circuit that generates the first direction running control signal during a period when the reverse feed control signal and the even track signal are input; and a logic circuit that responds to the output of the logic circuit and the tape drive/stop signal. a first drive signal forming circuit that generates the drive signal in the first direction during a period in which the tape drive signal is generated together with the travel control signal in the first direction; a second drive signal forming circuit that generates a drive signal in the second direction during a period in which the tape drive signal is generated together with the travel control signal in the second direction in response to the tape drive/stop signal; and a memory provided at a stage upstream of the recording side magnetic head element selection circuit for temporarily storing input data during at least a reversal period of the tape running direction. 2. The digital magnetic recording device according to claim 1, wherein the logic circuit is an exclusive OR circuit.