JPH08111002A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE: To obtain a magnetic recording and reproducing device with which input digital signals varied in data rates are recorded and reproduced while tracks are diagonally formed by using a rotary head. CONSTITUTION: This magnetic recording and reproducing device is provided with traveling means 14, 15 for driving a magnetic tape T to travel at a first traveling speed which is a predetermined reference and driving the magnetic tape T to travel at a second traveling speed which is 1/n or n times (n is a natural number) the first traveling speed. At the time of recording, the magnetic tape T is driven to travel at the first traveling speed and the information signals corresponding to the first traveling speed and the input digital signals having the data rate to be the reference are recorded. The magnetic tape T is then driven to travel at the second traveling speed and the information signals corresponding to the second traveling speed and input digital signals having the data rate different from the input digital signals are recorded. At the time of reproducing, the signals recorded on the magnetic tape T based on the information signals reproduced from the magnetic tape T are reproduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention uses a rotary head to
The present invention relates to a magnetic recording / reproducing device for recording / reproducing input digital signals having different data rates while obliquely forming tracks.

[0002]

2. Description of the Related Art Conventionally, what is called a video tape recorder (VTR) is used as a magnetic recording / reproducing apparatus for recording and reproducing a signal on a magnetic recording medium such as a magnetic tape using a rotary head.
There is a digital tape recorder (DAT) and the like, which has a feature that high-density recording and reproduction of a video / audio signal or an audio signal converted into a digital signal can be performed.

Nowadays, there have been proposed applications for converting video signals, audio signals, or other information signals into digital signals (MPEG1, MPEG2, DVB, ATV, etc.) of various data rates and recording / reproducing the signals. .

In order to efficiently record and reproduce such a digitized information signal, a PCM signal recording / reproducing apparatus for recording / reproducing a PCM signal of an audio signal or a voice signal by using a rotary head (Japanese Patent Laid-Open No. Sho-61-200). 59-1953
No. 06), a rotary head type audio digital tape recorder (Japanese Patent Laid-Open No. 59-262103).
Etc. have been proposed.

[0005]

However, in the above digital tape recorder, the digital signal processed at the basic data rate and the digital signal processed at the data rate of 1/3 are recorded, Although it is stated that the data is reproduced, there is no disclosure about a magnetic recording / reproducing apparatus that supports various data rates other than the basic data rate.

Further, this digital tape recorder has a disadvantage that when a digital signal is recorded at different data rates, only three times (odd number) long time recording / reproduction can be performed due to the recording azimuth of adjacent tracks.

Further, in the above-mentioned PCM signal recording / reproducing apparatus, in order to record and reproduce the PCM signal time-compressed for the magnetic tape contact period of the rotary head during the magnetic tape contact period, a predetermined rotation cycle of the rotary head. It is necessary to stop the running of the magnetic tape in the period in which the magnetic tape is abutted three times in the above and to carry out the complicated control of the magnetic tape because the magnetic tape needs to be transferred at a high speed for the rest of the predetermined rotation cycle. was there.

Therefore, it has been desired to solve the above-mentioned drawbacks and to provide a magnetic recording / reproducing apparatus which is compatible with various data rates lower than the basic data rate.

[0009]

Therefore, in order to solve the above-mentioned problems, the present invention provides the following configurations (1) to (4). (1) An input digital signal is recorded on a magnetic recording medium by a head having a first azimuth angle and a head having a second azimuth angle, which are mounted on a rotating drum that is rotated at a constant rate.
In a magnetic recording / reproducing apparatus for reproducing, the magnetic recording medium is driven to travel at a first traveling speed that is a predetermined reference, and the magnetic recording medium is 1 / n times the first traveling speed, or The recording medium is provided with a traveling unit that is driven to travel at a second traveling speed that is n times (n is a natural number).
The magnetic recording medium is driven to run at the first running speed, and an information signal corresponding to the first running speed and an input digital signal having a reference data rate are recorded.
Further, the magnetic recording medium is driven to run at the second running speed, an information signal corresponding to the second running speed and an input digital signal having a data rate different from the input digital signal are recorded, and at the time of reproduction. A magnetic recording / reproducing apparatus for reproducing a signal recorded in the magnetic recording medium based on the information signal reproduced from the magnetic recording medium. (2) Magnetic recording for recording and reproducing an input digital signal on a magnetic recording medium by a rotary head in which a head having a first azimuth angle and a head having a second azimuth angle are arranged at the same height with respect to a rotary drum. In the reproducing apparatus, a predetermined first traveling speed of the magnetic recording medium, a second traveling speed of 1 / 2n (n is a natural number) with respect to the first traveling speed, or a first traveling speed. 1 / for traveling speed
The recording medium is provided with a traveling unit that switches the traveling speed to a third traveling speed that is (2n + 1) (n is a natural number), and during recording, the magnetic recording medium is driven to travel at the first traveling speed to drive the first traveling speed. An information signal corresponding to the traveling speed and an input digital signal having a reference data rate are recorded, and the magnetic recording medium is driven to travel at the second traveling speed to correspond to the second traveling speed. An information signal and an input digital signal having a data rate different from that of the input digital signal are recorded, and at the time of reproduction, the signal recorded on the magnetic recording medium is reproduced based on the information signal reproduced from the magnetic recording medium. A magnetic recording / reproducing apparatus characterized by the above. (3) An input digital signal is output by a rotary head arranged on a rotary drum with a first azimuth angle head and a second azimuth angle head displaced by an interval corresponding to the pitch of a recording track formed on a magnetic recording medium. In a magnetic recording / reproducing apparatus for recording and reproducing on a magnetic recording medium, a predetermined first traveling speed of the magnetic recording medium and 1 / n (n is a natural number) with respect to the first traveling speed. The magnetic recording medium is driven to travel at the first traveling speed at the time of recording, and the information signal and the reference corresponding to the first traveling speed are provided. An input digital signal having the following data rate is recorded, the magnetic recording medium is driven to run at the second running speed, and the information signal corresponding to the second running speed and the input signal are input. The input digital signal having a different data rate from the input digital signal is recorded, and at the time of reproduction,
A magnetic recording / reproducing apparatus for reproducing a signal recorded on the magnetic recording medium based on the information signal reproduced from the magnetic recording medium. (4) An input digital signal is output by a rotary head that is arranged on a rotary drum with a first azimuth angle head and a second azimuth angle head displaced by an interval corresponding to the pitch of a recording track formed on a magnetic recording medium. In a magnetic recording / reproducing apparatus for recording and reproducing on a magnetic recording medium, a predetermined first traveling speed of the magnetic recording medium and a second traveling speed which is double the first traveling speed. And an input having a data rate serving as a reference and an information signal corresponding to the first traveling speed when the magnetic recording medium is driven to travel at the first traveling speed during recording. A digital signal is recorded, the magnetic recording medium is driven to run at the second running speed, and an information signal corresponding to the second running speed and the input digital signal are recorded. An input digital signal having a different data rate is recorded, and at the time of reproduction, a signal recorded on the magnetic recording medium is reproduced based on the information signal reproduced from the magnetic recording medium. apparatus.

[0010]

1 is a block diagram for explaining the present magnetic recording / reproducing apparatus, FIG. 2 is a diagram for explaining the arrangement of a rotary head in the first embodiment of the present magnetic recording / reproducing apparatus, FIGS. , FIG. 7 is a timing chart for explaining the operation of the magnetic recording / reproducing apparatus according to the first embodiment, and FIGS.
FIG. 8 is a diagram for explaining the track pattern of the magnetic tape in the first embodiment, FIG. 9 is a diagram for explaining the arrangement of the rotary head in the second embodiment of the magnetic recording / reproducing apparatus, FIGS. 11 is a timing chart for explaining the operation of the present magnetic recording / reproducing apparatus in the second embodiment, FIGS. 11 and 13 are diagrams for explaining the track pattern of the magnetic tape in the second embodiment, and FIG. 14 is the present magnetic recording. FIG. 15 and FIG. 17 are timing charts for explaining the operation of the magnetic recording / reproducing apparatus of the third embodiment, and FIGS. 16 and 18 are charts for explaining the arrangement of the rotary head in the third embodiment of the reproducing apparatus. FIG. 9 is a diagram for explaining a track pattern of the magnetic tape in the third embodiment. Less than,
A magnetic recording / reproducing apparatus according to the present invention will be described with reference to the drawings along with first to third embodiments.

First, the magnetic recording / reproducing apparatus according to the present invention is shown in FIG.
, A signal recording system for recording a digital signal (input digital signal) supplied from a transmission line (not shown) on a magnetic recording medium (magnetic tape) T while forming a track pattern, and recording by this signal recording system. And a signal reproduction system for reproducing the generated signal.

The above-mentioned signal recording system includes an input interface means 1 for converting the above-mentioned input digital signal into a data rate for processing by the present magnetic recording / reproducing apparatus, and a digital signal outputted from the input interface means 1 for a track which will be described later. A memory unit 2 including a plurality of memories that perform writing and reading at every cycle, an outer code generation circuit 3 that generates a predetermined error correction code from a digital signal written in the memory unit 2 and supplies the error correction code to the memory unit 2, the memory unit Two
The digital signal read from the internal code generation circuit 4 for generating a predetermined error correction code according to another sequence and adding the code to the digital signal of the predetermined block, the digital signal output from the internal code generation circuit 4 , A formatter 5 and a formatter for performing recording modulation for adding a synchronization signal and an identification signal (ID) to each predetermined block for recording a digital signal on the magnetic tape T in a predetermined array A recording amplifier 6 for amplifying the modulated digital signal output from the recording amplifier 5 to a predetermined gain, and rotary heads 7a to 7d for recording the amplified modulated digital signal output from the recording amplifier 6 on the magnetic tape T (also simply referred to as heads. The rotary heads 7a to 7d are configured to supply a reproduction signal reproduced from a magnetic tape to a signal reproduction system described later during reproduction).

Here, for example, when the user inputs an instruction for the traveling speed of the magnetic tape T from the input means 18, this instruction is supplied to the control means 14, and the control means 14 determines the traveling speed of the magnetic tape T based on this instruction. The information signal shown is supplied to the formatter 5. The formatter 5 adds this information signal to the digital signal for each block as a part of the above-mentioned ID information.

Further, the above-mentioned control means 14 supplies a control signal to the tape drive means 15 for controlling the drive of the running system of the magnetic tape T based on this information signal. Based on this control signal, the tape drive means 15 controls the drive system of the running system of the magnetic tape T (not shown) corresponding to the user's instruction input.

Further, at this time, the control signal recording / reproducing means 16 generates a control signal based on a synchronizing signal generator (not shown) or a synchronizing signal separated from the input digital signal, and the control signal is generated by the control head 17.
It records on the magnetic tape T by.

The signal reproduction system described above is based on the rotary head 7a.
A reproduction amplifier 8 for amplifying a reproduction signal obtained by scanning the magnetic tape T by 7b to a predetermined gain, a waveform equalizing circuit (not shown) for shaping the waveform of the reproduction signal amplified by the reproduction amplifier 8,
Extract the timing signal from the waveform-shaped signal,
A PLL circuit (not shown) that restores the signal sequence of "1" and "0", a synchronization detection circuit (not shown) that performs synchronization detection from the restored signal sequence, a demodulation circuit (not shown) that demodulates the recording modulation, and a demodulated digital signal Among them, the deformer 9 for detecting the above-mentioned ID and arranging the signal arrangement, the inner code correction circuit 10 for performing error correction of the digital signal output from the deformatter 9, and the inner code correction circuit 10 for error correction A memory unit 11 that stores a digital signal in accordance with the above ID, a predetermined error correction is performed along the outer code to which the digital signal stored in the memory unit 11 is added, and the outer correction that supplies the corrected information to the memory unit 11 The circuit 12 and the output interface unit 13 for converting the digital signal read from the memory unit 11 into a desired external data rate. It is.

Here, the deformatter 9 supplies an information signal indicating the traveling speed of the magnetic tape T among the detected IDs to the above-mentioned control means 14, and the control means 14 uses this speed information to drive the tape drive means. A control signal is supplied to 15, and the tape drive means 15 controls the drive of the running system of the magnetic tape T based on this control signal.

(First Embodiment) Next, the first embodiment of the present magnetic recording / reproducing apparatus will be described. The first azimuth angle head and the second azimuth angle head are used as the rotary drum 1.
Rotating heads 7a, 7b, 7c arranged at the same height with respect to 9
In the magnetic recording / reproducing apparatus for recording and reproducing the input digital signal on the magnetic tape T by means of the magnetic tape T, the magnetic tape T is moved to a predetermined first tape traveling speed and 1 / 2n ( n is a natural number), and the second tape running speed is switched to a second tape running speed that is 1 / (2n + 1) (n is a natural number) with respect to the first tape running speed. A running means (control means 14, tape driving means 15) is provided, and at the time of recording, a desired input digital signal and a speed information signal corresponding to the tape running speed are recorded on the magnetic tape T.
During reproduction, the signal recorded on the magnetic tape T is reproduced on the basis of the speed information signal.

As shown in FIG. 2, the rotary drum 19 is equipped with heads 7a, 7c having a first azimuth angle and a head 7b having a second azimuth angle, of which the first azimuth angle is included. The heads 7a and 7b of the
The heads 7c having the first azimuth angle and the heads 7b having the second azimuth angle are arranged so as to face each other, and form a combination head.

However, it is difficult in practice to arrange the rotary heads 7a and 7b described above completely opposite to each other by 180 ° because of mechanical restrictions. Therefore, by changing the recording start time of the recording signal for each head as necessary, the above-described track pattern can be formed at the same horizontal height. In addition, the rotary head 7 described above
b and 7c are actually 3 due to mechanical mounting restrictions.
Since it is impossible to mount them at the 60 ° position (they should be located at the same position), they are mounted at positions as close to each other as possible. Therefore, it is possible to change the recording start time of the recording signal for each head as needed so that the tracks are formed at the same height (in the horizontal direction).

Now, description will be given of a case where, when a digital signal having a data rate A [Mbps] is supplied to the magnetic recording / reproducing apparatus, recording is performed at a standard magnetic tape traveling speed with the digital signal as a basic data rate. Further, at this time, it is assumed that the rotation speed of the rotary drum 19 is kept constant.

At this time, the user uses the input means 18 described above.
Is used to input an instruction to record a digital signal at the first tape running speed which is the standard magnetic tape running speed. The input digital signal supplied to the signal recording system is subjected to the above-mentioned signal processing and is supplied to a head changeover switch (not shown) as an amplified modulation digital signal.

At the same time, the above-mentioned control means 14
Controls the tape drive means 15 based on this instruction input to drive the magnetic tape T at the first tape running speed. Here, the magnetic tape T is wound around the rotary drum 19 over approximately 180 °, and the standard magnetic tape running speed is, for example, the first azimuth angle when the rotary drum 19 makes a half rotation. The rotary head 7a forms one track pattern on the magnetic tape T, and when the rotary drum 19 makes a half rotation thereafter, the rotary head 7b having the second azimuth angle forms another track pattern at a position adjacent to this track pattern. It is the amount of movement of the magnetic tape required to form one (FIG. 4).

The operation of the signal recording system at this time will be described with reference to the timing chart of FIG. The input digital signal (a supplied through the above-mentioned input interface 1
3 to c) are, as shown in FIG. 3, the first part in the memory unit 2 described above for each track cycle synchronized with the rotation of the rotary drum 19.
Is written to the memory (one of a plurality of memories configured in the memory unit 2) (memory writing in the figure; part a). The outer code for the digital signal stored in the next half track cycle written in the memory is generated by the outer code generation circuit 3 and supplied to this memory (outer code generation in the figure). On the other hand, writing is performed to another second memory in the above-mentioned memory unit 2 (memory writing in the figure; part b).

Furthermore, in the next half track period, the first
When the digital signal to which the outer code is added is read from the memory of, the digital signal is supplied to the inner code generation circuit 4, and after the inner code is added, the digital signal is passed through the formatter 5 and the recording amplifier 6 (the same as above). (Internal code generation to recording modulation in the figure) is recorded on the magnetic tape T as an amplification modulation digital signal (recording signal in the figure). On the other hand, the outer code is added to the digital signal stored in the second memory described above, and writing is performed in another third memory in the memory unit 2 (memory writing in the figure; c)). Then, signal recording is performed on the magnetic tape T in accordance with this timing.

In practice, as shown in FIG. 4, the rotary head 7a having a first azimuth angle according to the rotation of the rotary drum 19 is rotated.
When the magnetic head T and the rotary head 7b having the second azimuth angle alternately scan the magnetic tape T, a head changeover switch (not shown) supplies an amplified modulated digital signal to each rotary head, so that a track pattern is formed on the magnetic tape T. The amplified and modulated digital signal is recorded while sequentially forming.

Next, when a digital signal of, for example, a data rate A / 2 [Mbps] is supplied to the magnetic recording / reproducing apparatus, this is set to 1 of the standard magnetic tape running speed described above.
A case of recording at a tape running speed of / 2 will be described. Further, at this time, it is assumed that the rotation speed of the rotary drum 19 is kept constant.

At this time, the user inputs the input means 18 described above.
Thus, an instruction input is made to record a digital signal at the second tape traveling speed (for example, 1/2 of the first tape traveling speed). The input digital signal supplied to the above signal recording system is supplied to a head changeover switch (not shown) as an amplified modulation digital signal through the above signal processing. At the same time, the above-mentioned control means 14 controls the tape drive means 15 based on this instruction input to drive the magnetic tape T at the second tape traveling speed.

As shown in FIG. 5, the input digital signals (a to c) supplied through the input interface 1 are stored in the memory unit 2 at the track cycle synchronized with the rotation of the rotary drum 19. One memory (one of a plurality of memories configured in the memory unit 2) is written (memory writing in the figure; part a), and the first memory is written in the next half track cycle. The signal stored in is kept held. The outer code for the digital signal stored in the next half track period is generated by the outer code generation circuit 3 and is supplied to this memory (outer code generation in the figure), while the other code in the memory unit 2 described above is generated. Is written to the second memory of the memory (memory write in the figure; b
Part).

Further, in the next half track period, the first
When the digital signal to which the outer code is added is read from the memory of, the digital signal is supplied to the inner code generation circuit 4, and after the inner code is added, the digital signal is passed through the formatter 5 and the recording amplifier 6 (the same as above). (Internal code generation to recording modulation in the figure) is recorded on the magnetic tape T as an amplification modulation digital signal (recording signal in the figure). On the other hand, the digital signal stored in the second memory described above is kept in the held state.

Further, the outer code is added to the digital signal stored in the second memory in the next half track period,
Writing is performed to another third memory in the above-mentioned memory unit 2 (memory writing in the figure; part c). Then, signal recording is performed on the magnetic tape T in accordance with this timing.

That is, the above data rate A [Mbp
[s] digital signal recording and data rate A / 2 [M
At the time of recording a digital signal of [bps], the timing of reading the digital signal with the outer code added from the memory and recording the digital signal on the magnetic tape is every double track period. In this way, the input digital signal supplied to the signal recording system is subjected to the above-described signal processing and supplied to a head changeover switch (not shown) as an amplified modulation digital signal.

At this time, using the head 7b having the second azimuth angle and the head 7c having the first azimuth forming the combination head, as shown in FIG.
The second azimuth head 7b is used to form a track pattern during one rotation of the disk, and the first azimuth head 7c is used to form a track during the next one rotation for recording.

Here, while the rotary drum 19 makes a half rotation, the recording signal a is supplied to the head 7b of the second azimuth by the head switching means (not shown) to form the track pattern in FIG. Then, in the next half rotation, the head 7a of the first azimuth forms the track pattern shown by the dotted line in the figure, so that the amplified modulated digital signal is not supplied to this head 7a at this time. Further, the recording signal b is supplied to the head 7c of the first azimuth during the next one rotation,
The next track pattern is formed. Thus, the track pattern as shown in FIG. 6 is formed on the magnetic tape T. Next, when a digital signal having a data rate of A / 5 [Mbps] is supplied to the magnetic recording / reproducing apparatus,
A case where this is recorded at a tape running speed which is ⅕ of the standard magnetic tape running speed described above will be described. Further, at this time, it is assumed that the rotation speed of the rotary drum 19 is kept constant.

At this time, the user inputs the input means 18 described above.
Thus, an instruction input for recording a digital signal at the third tape traveling speed (for example, 1/5 of the first tape traveling speed) is performed. The input digital signal supplied to the signal recording system is subjected to the above-mentioned signal processing and is supplied to a head changeover switch (not shown) as an amplified modulation digital signal. At the same time, the control means 14 controls the tape drive means 15 on the basis of this instruction input, and the magnetic tape T
Is run at the third tape running speed.

As shown in FIG. 7, the input digital signals (a to c) supplied via the input interface 1 are stored in the memory section 2 in the track cycle in synchronization with the rotation of the rotary drum 19. Writing is performed in one memory (one of a plurality of memories configured in the memory unit 2) (memory writing in the figure; part a), and the following 2.
The signal stored in the first memory remains held for five track periods. The outer code for the digital signal stored in this memory is generated by the outer code generation circuit 3 at the fifth half track period after the digital signal is stored in the first memory, and is supplied to this memory (the outer code in FIG. Is generated). On the other hand, another second memory in the memory unit 2 described above
Is written to the memory (memory write in the figure; part b), and the state held in this memory is maintained for 2.5 track cycles.

When the digital signal to which the outer code is added is read from the first memory in the 2.5th track period after the digital signal is first stored in the first memory, this digital signal is read by the inner code generation circuit. 4 is supplied to
After the inner code is added, through the formatter 5 and the recording amplifier 6 described above (internal code generation to recording modulation in FIG. 7)
The amplified modulated digital signal is recorded on the magnetic tape T (recording signal in FIG. 7).

When the digital signal to which the outer code is added is read from this memory at the fifth track period after the digital signal is stored in the second memory, the outer code is generated by the outer code generating circuit 3, and this memory is stored. Is supplied to. On the other hand, a state in which writing is performed to another third memory in the above-mentioned memory unit 2 (memory writing in the figure; part c), and is held in this memory for 2.5 track cycles Keep

When the digital signal to which the outer code is added is read from the second memory in the 2.5th track period after the digital signal is first stored in the first memory, this digital signal is generated by the inner code generation circuit. 4 is supplied to
After the inner code is added, it is recorded on the magnetic tape T as an amplified and modulated digital signal via the formatter 5 and the recording amplifier 6 described above. Then, signal recording is performed on the magnetic tape T in accordance with this timing.

That is, the above data rate A [Mbp
[s] digital signal recording and data rate A / 5 [M
At the time of recording the digital signal of [bps], the timing of reading the digital signal to which the outer code is added from the above-mentioned memory and recording the digital signal on the magnetic tape is every five times the half track period. In this way, the input digital signal supplied to the signal recording system is subjected to the above-described signal processing and supplied to a head changeover switch (not shown) as an amplified modulation digital signal.

At this time, the head 7a having the first azimuth angle
And a second azimuth head 7b that forms a combination head with a rotary drum 19 as shown in FIG.
Form a track pattern using the head 7a having the first azimuth angle every two and a half revolutions, and the second azimuth every two and a half revolutions after the head 7a having the first azimuth angle forms the track pattern. Recording is performed by forming a track using the head 7b.

Here, when the rotary drum 19 makes one rotation, an amplified modulated digital signal is supplied to the head 7a of the first azimuth by a head switching means (not shown) to form a track pattern on the magnetic tape T. The amplified and modulated digital signal is not supplied to the azimuth head 7b.
During the next one revolution, the head switching means does not supply the amplified and modulated digital signal to the heads 7a and 7b of the first and second azimuths. The track pattern shown by the dotted line in the figure is 1
It is a locus traced by a head mounted at a position opposed to 80 °, but no track is formed because writing is not performed. Then, when the rotary drum 19 starts to rotate next time, since the head 7a of the first azimuth angle corresponds to two and a half rotations after forming the track pattern, the head 7b of the second azimuth is amplified and modulated digitally. Supply a signal.

In this way, a track pattern as shown in FIG. 8 is formed on the magnetic tape T. So, for example,
When the data rate of the input digital signal supplied to the magnetic recording / reproducing apparatus changes to 1 / n (n is a natural number) of the data rate of the basic digital signal, the digital signal added with the outer code from the memory described above. Even when the data rate of the input digital signal becomes lower than the standard data rate by changing the timing of reading the data to n times the half track period and changing the running speed of the magnetic tape T as described above. Digital signals can be efficiently recorded on the magnetic tape T.

Further, the signals recorded on the magnetic tape T in this manner can be reproduced at the tape running speed at which they were respectively recorded, and the recorded digital signal can be reproduced through the above-mentioned signal reproducing system.

The signal recorded on the magnetic tape T as described above is reproduced by the rotary heads 7a to 7d at the time of reproduction and supplied to the signal reproduction system described above. Then, in this signal reproducing system, for example, the above-mentioned ID is detected from the recording signal demodulated by the deformatter 9, and the tape running speed at the time of recording is identified from the information signal included in this, so that this identification result is obtained. By supplying the magnetic tape T to the above-mentioned control means 14, the traveling control of the magnetic tape T is performed at the same traveling speed as during recording. In this way, the reproduced signal demodulated by the deformatter 9 undergoes the above-described outer code correction and inner code correction, and is output from the output interface to the transmission line (not shown) as an output digital signal.

(Second Embodiment) Next, a second embodiment of the present magnetic recording / reproducing apparatus will be described. A head 7a having a first azimuth angle and a head 7b having a second azimuth angle are attached to a magnetic tape T. In the magnetic recording / reproducing apparatus for recording and reproducing the input signal on the magnetic tape T by the rotary head arranged on the rotary drum 20 with a shift corresponding to the pitch of the recording track formed on the magnetic tape T, the magnetic tape T is predetermined. First
And a tape traveling (/ driving) means 15 for switching the tape traveling speed to a second tape traveling speed which is 1 / n (n is a natural number) with respect to the first tape traveling speed. During recording, a desired input signal and a speed information signal corresponding to the tape running speed are recorded on the magnetic tape T, and during reproduction, the signal recorded on the magnetic tape T is reproduced based on the speed information signal. It was configured to feature.

As shown in FIG. 9, the rotary drum 20 is equipped with a head 7a having a first azimuth angle and a head 7b having a second azimuth angle. The head 7b having an azimuth angle of 2 constitutes a combination head.

However, it is possible that the rotary heads 7a and 7b described above cannot be actually mounted at a completely 360 ° position (completely the same position) due to mechanical restrictions. The recording heads can be mounted at positions close to each other within the range, and the recording start time of the recording signal can be changed for each head as necessary so that the tracks are formed at the same height (in the horizontal direction). At this time, the rotary head
7a and 7b are mounted at different heights by the track pitch (track pattern width) formed in the magnetic recording / reproducing apparatus.

Now, a case will be described in which, when a digital signal having a data rate A [Mbps] is supplied to the magnetic recording / reproducing apparatus, recording is performed at a standard magnetic tape running speed with the digital signal as a basic data rate. Further, at this time, it is assumed that the rotation speed of the rotary drum 20 is kept constant.

At this time, the user uses the input means 18 described above.
Is used to input an instruction to record a digital signal at the first tape running speed which is the standard magnetic tape running speed. The input digital signal supplied to the signal recording system is subjected to the above-mentioned signal processing and is supplied to a head changeover switch (not shown) as an amplified modulation digital signal.

At the same time, the above-mentioned control means 14
Controls the tape drive means 15 based on this instruction input to drive the magnetic tape T at the first tape running speed. Here, the magnetic tape T is wound around the rotary drum 20 at about 180 °, and the standard magnetic tape running speed is the first tape running speed referred to here, and the above-described rotary drum 20. 11 makes one track pattern during one rotation, and then the rotary drum 2
0 is the amount of movement of the magnetic tape required to form another track pattern at a position adjacent to this track pattern when it makes one revolution.

The operation of the signal recording system at this time will be described with reference to the timing chart of FIG. As shown in FIG. 10, the input digital signals (a to d) supplied through the input interface 1 are the first digital signals (a to d) in the memory unit 2 in each track cycle synchronized with the rotation of the rotary drum 20. Writing is performed in the memory (one of a plurality of memories configured in the memory unit 2) (memory writing in the drawing; portion a). The outer code for the digital signal stored in the next half track cycle written in the memory is generated by the outer code generation circuit 3 and supplied to this memory (outer code generation in the figure). On the other hand, writing is performed to another second memory in the above-mentioned memory unit 2 (memory writing in the figure; part b).

In the next half track period, the outer code for the digital signal stored in the second memory is generated by the outer code generation circuit 3 and supplied to this memory. On the other hand, writing is performed to another third memory in the memory unit 2 described above (memory writing in the figure; part c).

Further, in the next half track cycle, the third
The outer code for the digital signal stored in the memory is generated by the outer code generation circuit 3 and supplied to this memory. On the other hand, writing is performed to another fourth memory in the above-mentioned memory unit 2 (memory writing in the figure; d
Part). Further, at this time, when the digital signals added with the outer code are read from the first memory and the second memory, respectively, the digital signals are read out by the inner code generation circuit 4
Are simultaneously supplied to the first system and the second system to which the inner code is added, and then, via the formatter 5 and the recording amplifier 6 (from the inner code generation to the recording modulation (first System, second system)) is recorded on the magnetic tape T as an amplified and modulated digital signal (recording signal in the figure). Then, signal recording is performed on the magnetic tape T in accordance with this timing.

In practice, when the rotary head 7a having the first azimuth angle and the rotary head 7b having the second azimuth angle simultaneously scan the magnetic tape T according to the rotation of the rotary drum 20, the head changeover switch is operated. By supplying the amplified modulated digital signal to each rotary head, the amplified modulated digital signal is recorded while sequentially forming track patterns on the magnetic tape T.

Next, when a digital signal of, for example, a data rate A / 2 [Mbps] is supplied to the magnetic recording / reproducing apparatus, this is set to 1 of the standard magnetic tape running speed described above.
A case of recording at a tape running speed of / 2 will be described. Further, at this time, it is assumed that the rotation speed of the rotary drum 20 is kept constant.

At this time, the user inputs the input means 18 described above.
Thus, an instruction input is made to record a digital signal at the second tape traveling speed (for example, 1/2 of the first tape traveling speed). The input digital signal supplied to the signal recording system described above is output from the signal recording system through the signal processing described above and is supplied to a head changeover switch (not shown) as an amplified modulation digital signal. At the same time, the above-mentioned control means 14 controls the tape drive means 15 based on this instruction input to drive the magnetic tape T at the second tape traveling speed.

As shown in FIG. 12, the input digital signals (a to d) supplied through the above-mentioned input interface 1 are stored in the above-mentioned memory unit 2 at the track cycle synchronized with the rotation of the rotary drum 20. 1 memory (memory unit 2
One of a plurality of memories configured inside is written (memory writing in the figure; part a), and the signal stored in the first memory is held in the next half track cycle. Keep the condition.

In the next half track period, the outer code for the stored digital signal is generated by the outer code generation circuit 3 and supplied to this memory (outer code generation in the figure), while the above-mentioned memory section is generated. Writing is performed to another second memory in 2 (memory writing in the figure; part b). The signal stored in the second memory remains held until the next half track period.

Then, the outer code for the signal stored in the second memory in the next half track period is the outer code generation circuit 3
And is supplied to this memory while being written to another third memory in the above-mentioned memory unit 2 (memory writing in the figure; part c). At this time, the signal stored in the third memory remains held until the next track cycle.

Further, in the next half track period, the first and second
Each of the digital signals is read out from the memory, and the inner code is generated and the recording modulation is performed (the inner code generation to the recording modulation;
(Second series), and the obtained amplified and modulated digital signals are supplied to a head changeover switch (not shown). At this time, the head changeover switch outputs the read first amplified and modulated digital signal to the rotary head 7a having the first azimuth angle.
The second series of amplified and modulated digital signals are supplied to the rotary heads 7b having the second azimuth angle, and the rotary heads 7a and 7b record the signals on the magnetic tape T. Then, signal recording is performed on the magnetic tape T in accordance with this timing.

That is, as shown in FIG. 12, this magnetic recording / reproducing apparatus records a signal on the magnetic tape T every two cycles after the signal is written in the first memory. At the tape running speed, the first and second series of amplified and modulated digital signals can be recorded on the magnetic tape T while forming the track pattern shown in FIG.

The signal recorded on the magnetic tape T as described above is reproduced by the rotary heads 7a to 7c at the time of reproduction and supplied to the signal reproduction system described above. Then, in this signal reproducing system, for example, the above-mentioned ID is detected from the recording signal demodulated by the deformatter 9, and the tape running speed at the time of recording is identified from the information signal included in this, so that this identification result is obtained. By supplying the magnetic tape T to the above-mentioned control means 14, the traveling control of the magnetic tape T is performed at the same traveling speed as during recording. In this way, the reproduced signal demodulated by the deformatter 9 undergoes the above-described outer code correction and inner code correction, and is output from the output interface to the transmission line (not shown) as an output digital signal.

(Third Embodiment) Next, a third embodiment of the magnetic recording / reproducing apparatus will be described. First, heads 7a and 7c having a first azimuth angle and heads 7b and 7d having a second azimuth angle are described. In the magnetic recording / reproducing apparatus for recording and reproducing the input signal on the magnetic tape T by the rotary head arranged on the rotary drum 21 with a shift corresponding to the pitch of the recording tracks formed on the magnetic tape T. Is provided with tape running means 14, 15 for switching the tape to a predetermined first tape running speed and a second tape running speed which is double the first tape running speed.
During recording, a desired input signal and a speed information signal corresponding to the tape traveling speed are recorded on the magnetic tape T, and during reproduction, the signal recorded on the magnetic tape T is reproduced based on the speed information signal. It is configured to do.

As shown in FIG. 14, the rotary drum 21 is equipped with a head 7a having a first azimuth angle and a head 7c having a second azimuth angle as a first combination head. Angled head 7b, second
And the azimuth angle head 7d are mounted as a second combination head.

However, the above combination head 7a
Due to the mechanical mounting restrictions, ~ 7d are mounted at positions that are as close to each other as practically possible.The recording start time of the recording signal can be changed for each head if necessary, and the tracks can be at the same height (horizontal direction). Of). Further, at this time, the combination heads 7a to 7d are mounted at different heights by the track pitch (width of the track pattern) formed in the present magnetic recording / reproducing apparatus.

Now, description will be given of a case where when a digital signal having a data rate A [Mbps], for example, is supplied to the magnetic recording / reproducing apparatus, recording is performed at a standard magnetic tape running speed with the digital signal as a basic data rate. Further, at this time, it is assumed that the rotation speed of the rotary drum 21 is kept constant.

At this time, the user uses the input means 18 described above.
Is used to input an instruction to record a digital signal at the first tape running speed which is the standard magnetic tape running speed. The input digital signal supplied to the signal recording system is subjected to the above-mentioned signal processing and is supplied to a head changeover switch (not shown) as an amplified modulation digital signal.

At the same time, the above-mentioned control means 14
Controls the tape drive means 15 based on this instruction input to drive the magnetic tape T at the first tape running speed. Here, the magnetic tape T is wound around the rotary drum 21 at about 180 °, and the standard magnetic tape running speed is, for example, the first combination head when the rotary drum 21 makes a half rotation. This is the distance traveled while forming one track pattern on the magnetic tape T. That is, the first tape running speed here means that one track pattern shown in FIG. 16 is formed during one rotation of the rotary drum 21, and the track pattern is formed when the rotary drum 21 makes one rotation next. Is the amount of movement of the magnetic tape T required to form another track pattern at a position adjacent to.

The operation of the signal recording system at this time will be described with reference to the timing chart of FIG. As shown in FIG. 15, the input digital signals (a to d) supplied via the input interface 1 are the first digital signals (a to d) in the memory unit 2 for each track cycle synchronized with the rotation of the rotary drum 21. Writing is performed in the memory (one of a plurality of memories configured in the memory unit 2) (memory writing in the drawing; portion a). The outer code for the digital signal stored in the next half track cycle written in the memory is generated by the outer code generation circuit 3 and supplied to this memory (outer code generation in the figure). On the other hand, writing is performed to another second memory in the above-mentioned memory unit 2 (memory writing in the figure; part b).

In the next half track period, the outer code for the digital signal stored in the second memory is generated by the outer code generation circuit 3 and supplied to this memory. On the other hand, writing is performed to another third memory in the memory unit 2 described above (memory writing in the figure; part c).

Further, in the next half track cycle, the third
The outer code for the digital signal stored in the memory is generated by the outer code generation circuit 3 and supplied to this memory. On the other hand, writing is performed to another fourth memory in the above-mentioned memory unit 2 (memory writing in the figure; d
Part). Further, at this time, when the digital signals to which the outer code is added are read out from the above-mentioned first and second memories, respectively, the digital signals are simultaneously supplied to the inner code generating circuit 4 and are supplied to the first and second systems. After the inner codes are separately added and divided, they are not shown as an amplified modulation digital signal via the formatter 5 and the recording amplifier 6 (internal code generation to recording modulation (first system, second system) in the figure). It is supplied to the head changeover switch.

The head changeover switch simultaneously supplies, for example, the amplified and modulated digital signals of the first and second systems to the rotary head 7a having the first azimuth angle and the rotary head 7c having the second azimuth angle, respectively. The first in the track cycle
The amplified modulated digital signals of the second system are simultaneously supplied to the rotary head 7b having the first azimuth angle and the rotary head 7d having the second azimuth angle, respectively. Then, the first and second combination heads described above record the amplified modulated digital signal on the magnetic tape T while forming the track pattern as shown in FIG. Thereafter, signal recording is performed at this timing.

Next, when a digital signal having a data rate of 2 A [Mbps], for example, is supplied to the magnetic recording / reproducing apparatus, the signal is recorded at a tape running speed twice the standard magnetic tape running speed described above. Will be explained. Further, at this time, it is assumed that the rotation speed of the rotary drum 21 is kept constant.

At this time, the user inputs the input means 18 described above.
Thus, an instruction is input to record the digital signal at the second tape traveling speed (for example, twice the first tape traveling speed). The input digital signal supplied to the signal recording system described above is output from the signal recording system through the signal processing described above and is supplied to a head changeover switch (not shown) as an amplified modulation digital signal. At the same time, the above-mentioned control means 14 controls the tape drive means 15 based on this instruction input to drive the magnetic tape T at the second tape traveling speed.

The operation of the signal recording system at this time will be described with reference to the timing chart of FIG. As shown in FIG. 17, the input digital signals (a to f) supplied through the input interface 1 are divided into the first to the first digital signals (a to f) in the memory unit 2 for each track cycle synchronized with the rotation of the rotary drum 21. Writing is performed in the sixth memory (a plurality of memories configured in the memory unit 2) (memory writing in the figure; portions a to f). For example, the outer code generation circuit 3 generates outer codes for the digital signals stored in the next half-track periods in which writing is performed in the first and fourth memories, respectively, and is generated in the first and fourth memories, respectively. It is supplied (outer code generation in the figure). On the other hand, at this timing, writing is performed in the other second and fifth memories in the memory unit 2 described above.

In the next half-track period, the above-mentioned second and fifth
Outer codes for the digital signals stored in the respective memories are generated by the outer code generation circuit 3 and supplied to the second and fifth memories. On the other hand, writing is performed in each of the other third and sixth memories in the memory unit 2 described above.
At this time, the digital signals stored in the first and fourth memories are divided into the first and second series and the inner code is added respectively, and then, via the formatter 5 and the recording amplifier 6 described above (see FIG. Inner code generation-recording modulation (first system, second system)) Amplification modulation As a digital signal is supplied to the head changeover switch, at the same time, a first or second combination head (for example, the first combination head at this time). ) (Recording signal (first system, second system)
system)).

Further, in the next half track cycle, the outer code for the digital signals stored in the third and sixth memories is generated by the outer code generation circuit 3 and supplied to the third and sixth memories. To be done. On the other hand, the digital signals stored in the second and fifth memories, respectively, are read by being divided into the first and second series, and the head code is generated as an amplified modulation digital signal through the above-described inner code generation to recording modulation. At the same time as being supplied to the changeover switch, it is supplied to, for example, the second combination head. At this time, the input digital signals continuously supplied are stored in the first and fourth memories, respectively.

The head changeover switch changes the rotation of the rotary drum 21 by switching and supplying the amplified and modulated digital signals of the first and second systems to the first and second combination heads every half track period described above. Amplified and modulated digital signals to be recorded in the track pattern on the magnetic tape T shown in FIG. 18 are recorded at the synchronized timing.

At this time, since the magnetic tape T is running at the second tape running speed (twice the first tape running speed), for example, the first rotation of the rotary drum 21 causes the first and second tapes to rotate. The azimuth heads 7a and 7c form a track pattern on the magnetic tape T, and in the next half rotation, the first and second azimuth heads 7b and 7d form the next track pattern on the magnetic tape T. Thus, at the second tape running speed, the first and second azimuth heads 7a to 7d record signals while sequentially forming track patterns on the magnetic tape T.

The signal recorded on the magnetic tape T as described above is reproduced by the rotary heads 7a to 7d at the time of reproduction and supplied to the signal reproduction system described above. Then, in this signal reproducing system, for example, the above-mentioned ID is detected from the recording signal demodulated by the deformatter 9, and the tape running speed at the time of recording is identified from the information signal included in this, so that this identification result is obtained. By supplying the magnetic tape T to the above-mentioned control means 14, the traveling control of the magnetic tape T is performed at the same traveling speed as during recording. In this way, the reproduced signal demodulated by the deformatter 9 undergoes the above-described outer code correction and inner code correction, and is output from the output interface to the transmission line (not shown) as an output digital signal.

The outer code correction process and the inner code correction process described above are not limited to the methods described above. For example, when the rotary head accurately scans the track pattern described above. May write a signal in which the outer code correction and the inner code correction have been completed for each track cycle period described above to the memory, or, for example, whether the rotary head is scanning the track pattern accurately or not. Regardless of this, it is needless to say that the outer code correction may be performed when the signal for which the inner code correction is completed is written in the memory and the data amount of the signal corresponding to one track period is written in the memory.

Thus, in the present magnetic recording / reproducing apparatus,
The input digital signals supplied at different data rates with respect to the basic data rate A [Mbps] described above use the rotary drums 19 to 21 configured as described in the first to third embodiments, respectively. As a result, the recording speed can be efficiently recorded on the magnetic tape T by varying the traveling speed of the magnetic tape T while keeping the rotation speed of the rotating drum constant.

In the magnetic recording / reproducing apparatus, the digital signal recorded on the magnetic tape T as described above is reproduced and demodulated by the above-mentioned signal reproducing system to reproduce almost the same as the input digital signal. It is reproduced as a digital signal.

By the way, in a magnetic recording / reproducing apparatus using a rotary head, the rotary head must always scan the track pattern on the magnetic tape accurately during reproduction. There is one that records and reproduces the control signal. Therefore, in such a magnetic recording / reproducing apparatus, for example, the control signal is variable (for example, when the signal is recorded on the magnetic tape at the time of recording).
By changing the signal waveform or changing the signal duty ratio) and recording on the control track on the magnetic tape, only the track on which the signal is recorded is scanned based on the detection of the control signal to obtain the reproduction signal. It is needless to say that the magnetic tape T may be controlled, the running time of the magnetic tape T may be measured, and the remaining amount of the magnetic tape T may be detected.

The configuration of the rotary head described above is not limited to the one described above, and various cases are conceivable. At that time, in accordance with the configuration of the rotary head, the above-described track cycle is changed for each track cycle. It goes without saying that the input digital signal supplied at the basic data rate or the input digital signal supplied at a different data rate may be recorded and reproduced, respectively, by performing signal processing.

[0087]

As described above, according to the structure of the present invention as set forth in claim 1, the data rate of a predetermined input digital signal is used as a basic data rate, and an input digital signal having a different data rate is recorded. At this time, there is an effect that the signal can be efficiently recorded on the magnetic tape by changing the traveling speed of the magnetic tape according to the data rate and performing recording.

At this time, the magnetic tape running speed at the time of recording a predetermined input digital signal is set as the first running speed, and the magnetic tape running speed at the time of recording an input digital signal having a data rate different from the first running speed. The second
Since it is possible to record a speed information signal corresponding to each as the traveling speed of the input digital signal together with the input digital signal,
By detecting and identifying this speed information signal, it is possible to obtain a reproduced digital signal that is substantially the same as the input digital signal from the recorded signal.

Furthermore, when an input digital signal having a data rate different from that of a predetermined input digital signal is recorded, it is possible to perform even-numbered time signal recording / reproduction in addition to the conventional odd-number multiple time signal recording / reproduction. effective.

Furthermore, since the rotation of the rotary drum is constant during recording and reproduction, the influence of the air film formed between the rotary drum and the magnetic tape due to the change in the rotational speed of the rotary drum is reduced. This has the effect of omitting complicated operations such as adjustment of the reproduction waveform that accompanies changes in the magnetic reversal interval during reproduction.

As described above, according to the configuration of the present invention as set forth in claim 2, in addition to the effects described above, at least heads having different azimuth angles are arranged on the rotary drum so as to face each other by 180 °, and thus the basic data rate can be improved. On the other hand, even when input digital signals of various data rates that are 1 / 2n, 1/2 (n + 1) (n is a natural number) less than this are supplied, the tape running speed is changed and the signals are more efficiently transmitted to the magnetic tape. There is an effect that can be recorded on.

As described above, according to the structure of the present invention as set forth in claim 3, in addition to the effects described above, the combination head including at least rotary heads having different azimuth angles is arranged on the rotary drum. Even when input digital signals of various data rates less than 1 / n (n is a natural number) less than the basic data rate are supplied, the tape running speed is varied and the signals are more efficiently recorded on the magnetic tape. The effect is that you can.

As described above, according to the structure of the present invention as set forth in claim 4, in addition to the above-mentioned effect, at least the combination head composed of the rotary heads having different azimuth angles is opposed to the rotary drum by 180 °. By arranging in the above, even when an input digital signal having a data rate twice as high as the basic data rate is supplied, the tape traveling speed can be varied and the signal can be more efficiently recorded on the magnetic tape. The effect is that you can do it.

[Brief description of drawings]

FIG. 1 is a block diagram for explaining the present magnetic recording / reproducing apparatus.

FIG. 2 is a diagram for explaining the arrangement of rotary heads in the first embodiment of the magnetic recording / reproducing apparatus.

FIG. 3 is a timing chart for explaining the operation of the magnetic recording / reproducing apparatus according to the first embodiment.

FIG. 4 is a diagram for explaining a track pattern of the magnetic tape in the first embodiment.

FIG. 5 is a timing chart for explaining the operation of the magnetic recording / reproducing apparatus according to the first embodiment.

FIG. 6 is a diagram for explaining a track pattern of the magnetic tape in the first embodiment.

FIG. 7 is a timing chart for explaining the operation of the magnetic recording / reproducing apparatus of the first embodiment.

FIG. 8 is a diagram for explaining a track pattern of the magnetic tape according to the first embodiment.

FIG. 9 is a diagram for explaining the arrangement of rotary heads in a second embodiment of the magnetic recording / reproducing apparatus.

FIG. 10 is a timing chart for explaining the operation of the magnetic recording / reproducing apparatus of the second embodiment.

FIG. 11 is a diagram for explaining a track pattern of a magnetic tape according to the second embodiment.

FIG. 12 is a timing chart for explaining the operation of the magnetic recording / reproducing apparatus according to the second embodiment.

FIG. 13 is a diagram for explaining the track pattern of the magnetic tape in the second embodiment.

FIG. 14 is a diagram for explaining the arrangement of rotary heads in the third embodiment of the magnetic recording / reproducing apparatus.

FIG. 15 is a diagram for explaining a track pattern of a magnetic tape according to a third embodiment.

FIG. 16 is a diagram for explaining a track pattern of a magnetic tape according to a third embodiment.

FIG. 17 is a timing chart for explaining the operation of the magnetic recording / reproducing apparatus of the third embodiment.

FIG. 18 is a diagram for explaining a track pattern of a magnetic tape according to a third embodiment.

[Explanation of symbols]

 1 Changeover Switch (Recording Means) 2 Recording Amplifier (Recording Means) 3 Changeover Switch (Recording Means / Detecting Means) 4a, 4b Magnetic Head 6 Magnetic Recording Medium 8 Preamplifier (Detecting Means) 9 Reproducing FM Detector (Detecting Means) 10 Control Means 11 Memory (Storage Means) 12 Usage Time Detection Means

Claims (4)

[Claims] 1. A magnetic recording / reproducing apparatus for recording and reproducing an input digital signal on a magnetic recording medium by a head having a first azimuth angle and a head having a second azimuth angle which are mounted on a rotating drum which is rotated at a constant speed. In the above, the magnetic recording medium is driven to travel at a first traveling speed serving as a predetermined reference, and the magnetic recording medium is moved to the first traveling speed.
Of the magnetic recording medium at a first traveling speed at the time of recording, the traveling means being driven to travel at a second traveling speed which is 1 / n times or n times (n is a natural number) the traveling speed. And driving the magnetic recording medium to record information signals corresponding to the first traveling speed and an input digital signal having a reference data rate, and driving the magnetic recording medium to travel at the second traveling speed. An information signal corresponding to a second traveling speed and an input digital signal having a data rate different from that of the input digital signal are recorded, and at the time of reproduction, the magnetic recording medium is based on the information signal reproduced from the magnetic recording medium. A magnetic recording / reproducing apparatus, which reproduces a signal recorded in a recording medium. 2. A rotary head in which a head having a first azimuth angle and a head having a second azimuth angle are arranged at the same height with respect to a rotary drum to record and reproduce an input digital signal on a magnetic recording medium. In a magnetic recording / reproducing apparatus, a first traveling speed of the magnetic recording medium which is predetermined,
A second traveling speed that is 1 / 2n (n is a natural number) with respect to the first traveling speed, or a third traveling speed that is 1 / (2n + 1) (n is a natural number) with respect to the first traveling speed. The recording medium is provided with a traveling unit that switches the traveling speed to the traveling speed, and during recording, the magnetic recording medium is driven to travel at the first traveling speed, and an information signal corresponding to the first traveling speed and a reference data rate. And an input digital signal having a data rate different from that of the information signal corresponding to the second running speed, and the magnetic recording medium being driven to run at the second running speed. A magnetic recording / reproducing apparatus for recording an input digital signal and reproducing the signal recorded on the magnetic recording medium based on the information signal reproduced from the magnetic recording medium during reproduction. 3. A rotary head having a first azimuth angle head and a second azimuth angle head, which are arranged on a rotary drum with a gap corresponding to the pitch of a recording track formed on a magnetic recording medium. In a magnetic recording / reproducing apparatus for recording and reproducing a signal on a magnetic recording medium, the magnetic recording medium has a predetermined first traveling speed,
The magnetic recording medium is provided with a traveling means for traveling by switching to a second traveling speed which is 1 / n (n is a natural number) with respect to the first traveling speed, and at the time of recording, the magnetic recording medium is moved to the first traveling speed. To drive an information signal corresponding to the first traveling speed and an input digital signal having a reference data rate, and to drive the magnetic recording medium to travel at the second traveling speed. An information signal corresponding to the second traveling speed and an input digital signal having a data rate different from that of the input digital signal are recorded, and at the time of reproduction, the magnetic recording is performed based on the information signal reproduced from the magnetic recording medium. A magnetic recording / reproducing apparatus characterized by reproducing a signal recorded on a medium. 4. A rotary head having a first azimuth angle head and a second azimuth angle head, which are arranged on a rotary drum with a gap corresponding to a pitch of a recording track formed on a magnetic recording medium. In a magnetic recording / reproducing apparatus for recording and reproducing a signal on a magnetic recording medium, the magnetic recording medium has a predetermined first traveling speed,
The recording medium further comprises a traveling means for traveling by switching to a second traveling speed which is twice as high as the first traveling speed, and during recording, the magnetic recording medium is driven to travel at the first traveling speed, An information signal corresponding to a first traveling speed and an input digital signal having a reference data rate are recorded, and the magnetic recording medium is driven to travel at the second traveling speed to obtain the second traveling speed. A signal recorded on the magnetic recording medium based on the information signal reproduced from the magnetic recording medium at the time of recording an information signal corresponding to the input digital signal having a data rate different from that of the input digital signal. A magnetic recording / reproducing apparatus characterized by reproducing.