JP2939967B2 - Magnetic recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a magnetic recording and reproducing apparatus for recording and reproducing input digital signals having different data rates while forming tracks diagonally.

[0002]

2. Description of the Related Art As a conventional magnetic recording / reproducing apparatus for recording and reproducing signals on a magnetic recording medium such as a magnetic tape using a rotary head, a so-called video tape recorder (VTR),
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 to a digital signal can be performed.

At present, there has been proposed an application for converting a video signal, an audio signal, or other information signals into digital signals (MPEG1, MPEG2, DVB, ATV, etc.) of various data rates, and recording and reproducing the signals. .

In order to efficiently record and reproduce such digitized information signals, a PCM signal recording / reproducing apparatus which records and reproduces an audio signal or an audio signal into a PCM signal by using a rotary head (Japanese Patent Application Laid-Open (JP-A) No) 59-1953
No. 06), a rotary head type digital tape recorder for audio (Japanese Patent Laid-Open No. 59-262103).
Etc. have been proposed.

[0005]

However, the digital tape recorder described above records a digital signal processed at a basic data rate and a digital signal processed at a 1/3 data rate. Although reproduction is described, there is no disclosure of a magnetic recording / reproducing apparatus corresponding to various other data rates lower than the basic data rate.

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

In the above-described recording / reproducing apparatus for a PCM signal, a PCM signal that has been time-compressed during the magnetic tape contact period of the rotary head is recorded and reproduced during the magnetic tape contact period. The disadvantage is that the running of the magnetic tape is stopped during the period in which the magnetic tape is abutted three times, and the magnetic tape must be transported at high speed during the remaining period of the predetermined rotation cycle, so that complicated control of the magnetic tape must be performed. was there.

Therefore, there has been a demand for a magnetic recording / reproducing apparatus which can solve the above-mentioned drawbacks and can cope with various data rates lower than the basic data rate.

[0009]

Therefore, the present invention provides the following constitutions (1) to (4) in order to solve the above-mentioned problems. (1) An input digital signal is recorded on a magnetic recording medium by a first azimuth angle head and a second azimuth angle head mounted on a rotating drum that rotates constantly.
In the magnetic recording / reproducing apparatus for reproducing, the magnetic recording medium is driven to run at a first reference traveling speed, which is a predetermined reference, and the magnetic recording medium is 1 / n times the first traveling speed, or a traveling means for driving at a second traveling speed which is n times (n is a natural number);
Driving the magnetic recording medium at the first traveling speed, and recording an information signal corresponding to the first traveling speed and an input digital signal having a reference data rate;
Further, the magnetic recording medium is driven to travel at the second traveling speed, and an information signal corresponding to the second traveling speed and an input digital signal having a data rate different from the input digital signal are recorded. 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. (2) An input digital signal is converted by a rotary head arranged on a rotary drum by displacing a head having a first azimuth angle and a head having a second azimuth angle by an interval corresponding to a pitch of a recording track formed on a magnetic recording medium. In a magnetic recording / reproducing apparatus that records and reproduces data on and from a magnetic recording medium, the magnetic recording medium has a predetermined first traveling speed and 1 / n (n is a natural number) with respect to the first traveling speed. And a traveling means for traveling while switching to the second traveling speed. At the time of recording, the magnetic recording medium is driven to travel at the first traveling speed, and an information signal and a reference corresponding to the first traveling speed are recorded. An input digital signal having the following data rate is recorded, the magnetic recording medium is driven to travel at the second traveling speed, and an information signal corresponding to the second traveling speed and the input signal are recorded. Recording an input digital signal having a digital signal and different data rates, at the time of reproduction,
A magnetic recording / reproducing apparatus which reproduces a signal recorded on the magnetic recording medium based on the information signal reproduced from the magnetic recording medium. (3) An input digital signal is input by a rotary head arranged on a rotary drum by displacing a head having a first azimuth angle and a head having a second azimuth angle by an interval corresponding to a pitch of a recording track formed on a magnetic recording medium. In a magnetic recording / reproducing apparatus that records and reproduces data on and from a magnetic recording medium, a first traveling speed of the magnetic recording medium that is predetermined and a second traveling speed that is twice as large as the first traveling speed. The magnetic recording medium is driven to run at the first running speed during recording, and an information signal corresponding to the first running speed and an input having a reference data rate are provided. A digital signal, and the magnetic recording medium is driven to travel at the second traveling speed, and an information signal corresponding to the second traveling speed and the input digital signal are recorded. Magnetic recording and reproducing, wherein an input digital signal having a 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]

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

First, a magnetic recording / reproducing apparatus according to the present invention is shown in FIG.
As shown in FIG. 1, a signal recording system for recording a digital signal (input digital signal) supplied from a transmission path (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 reproducing system for reproducing the reproduced signal.

The signal recording system includes an input interface unit 1 for converting the input digital signal into a data rate for processing by the magnetic recording / reproducing apparatus, and a digital signal output from the input interface unit 1 for a track described later. A memory unit 2 including a plurality of memories that perform writing and reading in each cycle; an outer code generation circuit 3 that generates a predetermined error correction code from a digital signal written to the memory unit 2 and supplies the code to the memory unit 2; 2
An internal code generation circuit 4 for generating a predetermined error correction code from the digital signal read from the digital signal according to another series and adding the generated error correction code to a digital signal of a predetermined block. A formatter 5 for adding a synchronization signal and an identification signal (ID) for each predetermined block to record digital signals in a predetermined arrangement on the magnetic tape T and performing recording modulation for recording on the magnetic tape T; A recording amplifier 6 for amplifying the modulated digital signal output from the recording amplifier 5 to a predetermined gain, and rotating heads 7a to 7d for recording on the magnetic tape T the amplified modulated digital signal output from the recording amplifier 6 (also referred to simply as a head. 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 of the traveling speed of the magnetic tape T from the input means 18, the instruction is supplied to the control means 14, and the control means 14 controls the traveling speed of the magnetic tape T based on the instruction. The information signal shown is supplied to the formatter 5. The formatter 5 adds this information signal to the digital signal of each block as a part of the information of the ID.

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

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.
On the magnetic tape T.

The above-described signal reproducing system includes the rotary head 7a
Reproducing amplifier 8 ~ 7d amplifies the reproduction signal obtained by scanning the magnetic tape T at a predetermined gain, waveform equalizing circuit (not shown) performs waveform shaping of reproduction signals reproduced amplifier 8 is amplified,
Extract the timing signal from the waveform-shaped signal,
A PLL circuit (not shown) for restoring the signal sequence of "1" and "0", a synchronization detection circuit (not shown) for detecting synchronization from the restored signal sequence, a demodulation circuit (not shown) for demodulating recording modulation, and a demodulated digital signal Among them, the above-described ID is detected, and the error is corrected by the inner code correction circuit 10 which corrects the error of the digital signal output from the deformatter 9 which arranges the arrangement of the signal and the digital signal output from the deformatter 9. memory unit 11 for storing the digital signal in accordance with ID described above, performs a predetermined error correction along the outer code added digital signals stored in the memory unit 11, and supplies outer code correction information in the memory unit 11 A correction circuit 12, an output interface means 13 for converting a digital signal read from the memory unit 11 into a desired external data rate, Constructed.

The deformatter 9 supplies an information signal indicating the running speed of the magnetic tape T to the control means 14 among the detected IDs. The tape drive unit 15 supplies a control signal to the magnetic tape T based on the control signal.

(First Embodiment) Next, a first embodiment of the present magnetic recording / reproducing apparatus will be described. A head having a first azimuth angle and a head having a second azimuth angle are connected to the rotating drum 19. In the magnetic recording / reproducing apparatus for recording and reproducing the input digital signal on the magnetic tape T by the rotary heads 7a, 7b, 7c arranged at the same height, the magnetic tape T is driven at a predetermined first tape running speed and , 1 / 2n (n
Is a natural number) or the second tape running speed, or the first
Tape running means (control means 14 and tape driving means 15) for switching the tape running speed to a third tape running speed which is 1 / (2n + 1) (n is a natural number) with respect to the tape running speed. Records a desired input digital signal and a speed information signal corresponding to the tape running speed on the magnetic tape T, and reproduces a signal recorded on the magnetic tape T based on the speed information signal during reproduction. It was configured to be a feature.

As shown in FIG. 2, the rotary drum 19 is equipped with heads 7a and 7c having a first azimuth angle and a head 7b having a second azimuth angle. Heads 7a and 7c are placed on the rotating drum 19 by 180
The head 7c having the first azimuth angle and the head 7b having the second azimuth angle constitute a combination head.

However, the rotary heads 7a and 7c described above are actually difficult to be arranged completely 180 ° facing each other due to mechanical mounting restrictions. Therefore, by varying the recording start time of the recording signal for each head as needed, the above-described track pattern can be formed at the same height in the horizontal direction. Also, the rotary head 7 described above
b and 7c are actually completely 3 due to mechanical mounting constraints.
Since it is impossible to be mounted at a position of 60 ° (completely the same position), it is mounted as close as possible. Therefore, the recording start time of the recording signal can be varied for each head as necessary, so that the tracks are formed at the same height (in the horizontal direction).

Now, a description will be given of a case where, for example, when a digital signal of a data rate A [Mbps] is supplied to the magnetic recording / reproducing apparatus, this is used as a basic data rate and recorded at a standard magnetic tape running speed. At this time, it is assumed that the rotation speed of the rotating drum 19 is kept constant.

At this time, the user operates the input means 18 described above.
To input a command to record a digital signal at a first tape running speed which is a standard magnetic tape running speed. The input digital signal supplied to the above-described signal recording system is supplied to a head switch (not shown) as an amplified modulated digital signal through the above-described signal processing.

At the same time, the control means 14
Controls the tape driving means 15 based on this instruction input to cause the magnetic tape T to run at the first tape running speed. Here, the magnetic tape T is wound around the rotary drum 19 for approximately 180 °, and the standard magnetic tape traveling speed is, for example, the first azimuth angle when the rotary drum 19 makes a half rotation. The rotating head 7a forms one track pattern on the magnetic tape T, and then when the rotating drum 19 makes a half turn, the rotating head 7b of the second azimuth angle forms another track pattern at a position adjacent to the track pattern. The amount of movement of the magnetic tape required to form one is set (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 input interface 1 described above.
To c), as shown in FIG. 3, the first memory in the memory unit 2 described above for each track cycle synchronized with the rotation of the rotary drum 19.
(One of a plurality of memories configured in the memory unit 2) is written (memory write in FIG. 5; part a). An outer code generation circuit 3 generates an outer code for the digital signal stored in the next half-track cycle after writing to the memory, and supplies the outer code to the memory (outer code generation in the figure). On the other hand, writing is performed on another second memory in the above-mentioned memory unit 2 (memory writing in the figure; part b).

Further, in the next half track cycle, the first
When the digital signal to which the outer code is added is read from the memory of FIG. 1, this digital signal is supplied to the inner code generation circuit 4 and, after the inner code is added thereto, via the formatter 5 and the recording amplifier 6 described above. (Inner code generation to recording modulation in the figure) is recorded on the magnetic tape T as an amplified modulation digital signal (recording signal in the figure). On the other hand, an outer code is added to the digital signal stored in the second memory, and writing is performed in another third memory in the memory unit 2 (memory writing in FIG. c part). Thereafter, signal recording is performed on the magnetic tape T at this timing.

In practice, as shown in FIG. 4, the rotary head 7a having a first azimuth angle is
When the magnetic head T and the rotary head 7b having the second azimuth angle alternately scan on the magnetic tape T, a head 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. Are sequentially recorded, and the amplified modulated digital signal is recorded.

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

At this time, the user operates the input means 18 described above.
Thus, an instruction is input to record a digital signal at a second tape running speed (for example, の of the first tape running speed). The input digital signal supplied to the signal recording system described above is supplied to a head switch (not shown) as an amplified modulated digital signal through the signal processing described above. At the same time, the control means 14 controls the tape driving means 15 based on the instruction input to cause the magnetic tape T to run at the second tape running speed.

As shown in FIG. 5, the input digital signals (a to c) supplied through the input interface 1 are transmitted in the memory unit 2 at a track cycle synchronized with the rotation of the rotating drum 19. 1 is written into one memory (one of a plurality of memories configured in the memory unit 2) (memory write in the figure; part a), and in the next half track cycle, the first memory is written. The state stored in the memory is maintained. An outer code for the digital signal stored in the next half-track cycle is generated by an outer code generation circuit 3 and 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 in the second memory (memory writing in FIG.
Part).

Further, in the next half track cycle, the first
When the digital signal to which the outer code is added is read from the memory of FIG. 1, this digital signal is supplied to the inner code generation circuit 4 and, after the inner code is added thereto, via the formatter 5 and the recording amplifier 6 described above. (Inner code generation to recording modulation in the figure) is recorded on the magnetic tape T as an amplified modulation digital signal (recording signal in the figure). On the other hand, the digital signal stored in the second memory is kept in a held state.

Further, an outer code is added to the digital signal stored in the second memory in the next half track cycle,
Writing is performed on another third memory in the memory unit 2 described above (memory writing in the figure; part c). Thereafter, signal recording is performed on the magnetic tape T at this timing.

That is, the data rate A [Mbp
s] and the data rate A / 2 [M
At the time of recording a digital signal of [bps], the timing of reading a digital signal with an outer code added from the above-described memory and recording the digital signal on a magnetic tape is at twice the track period. Thus, the input digital signal supplied to the above-mentioned signal recording system is supplied to a head switch (not shown) as an amplified modulated digital signal through the above-described signal processing.

At this time, as shown in FIG. 6, the rotary drum 19 is used by using the head 7b having the second azimuth angle and the head 7c having the first azimuth angle which constitute the combination head.
The track pattern is formed by using the second azimuth head 7b when the disk rotates once, and the track is formed and recorded by using the first azimuth head 7c during the next rotation.

Here, while the rotary drum 19 makes a half rotation, the recording signal a is supplied to the second azimuth head 7b by the head switching means (not shown), and the track pattern in FIG. 6 is formed. Then, in the next half rotation, the first azimuth head 7a forms the track pattern shown by the dotted line in the figure. At this time, no amplified modulated digital signal is supplied to this head 7a. At the next one rotation, the recording signal b is supplied to the first azimuth head 7c,
The next track pattern is formed. Thus, a 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, for example,
A case where recording is performed at a tape traveling speed of 1/5 of the standard magnetic tape traveling speed described above will be described. At this time, it is assumed that the rotation speed of the rotating drum 19 is kept constant.

At this time, the user operates the input means 18 described above.
Thus, an instruction to record a digital signal at a third tape traveling speed (for example, 1/5 of the first tape traveling speed) is input. The input digital signal supplied to the above-described signal recording system is supplied to a head switch (not shown) as an amplified modulated digital signal through the above-described signal processing. At the same time, the control means 14 controls the tape driving means 15 based on the instruction input, and
At a third tape running speed.

As shown in FIG. 7, the input digital signals (a to c) supplied through the input interface 1 are transmitted in the memory unit 2 at a track cycle synchronized with the rotation of the rotary drum 19. 1 is written into one memory (one of a plurality of memories configured in the memory unit 2) (memory writing in FIG. 1; part a).
The signal stored in the first memory is held for five track periods. An 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. Generated). On the other hand, another second in the memory unit 2 described above
Is written in the memory (No. b in the figure; memory writing in FIG. 3), and the state held in this memory is maintained for the following 2.5 track periods.

When a digital signal to which an outer code is added is read out from the first memory at the 2.5th track period after the digital signal is first stored in the first memory, this digital signal is converted to an inner code generating circuit. 4 supplied to
After the inner code is added, the information is passed through the formatter 5 and the recording amplifier 6 described above (from inner code generation to recording modulation in FIG. 7).
It is recorded on the magnetic tape T as an amplified modulation digital signal (recording signal in FIG. 7).

When the digital signal to which the outer code has been added is read out 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 generation circuit 3 and this memory is read out. Supplied to On the other hand, writing is performed on another third memory in the above-mentioned memory unit 2 (memory writing in FIG. 3; part c), and the state where the data is retained in this memory for the following 2.5 track periods Keep.

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

That is, the data rate A [Mbp]
s] and the data rate A / 5 [M
At the time of recording a 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 half track periods. Thus, the input digital signal supplied to the above-mentioned signal recording system is supplied to a head switch (not shown) as an amplified modulated digital signal through the above-described signal processing.

At this time, the head 7a having the first azimuth angle
And a second azimuth head 7b constituting a combination head, as shown in FIG.
Every two and a half rotations, a track pattern is formed using the head 7a with the first azimuth angle, and every two and a half rotations after the head 7a with the first azimuth angle forms the track pattern, the second azimuth is formed. A track is formed and recorded by using the head 7b.

Here, when the rotating drum 19 makes one rotation, an amplified modulation digital signal is supplied to the first azimuth head 7a by a head switching means (not shown) to form a track pattern on the magnetic tape T, but a second pattern is formed. Amplified and modulated digital signal is not supplied to the azimuth head 7b.
During the next one rotation, the head switching means does not supply the amplified and modulated digital signal to the first and second azimuth heads 7a and 7b. In track patterns in the figure the dotted lines shown,
Since no writing is performed, no track is formed. When the rotating drum 19 starts rotating next time, it corresponds to two and a half rotations after the head 7a of the first azimuth angle forms a track pattern. Supply signal.

Thus, 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 to which the outer code is added from the above memory The readout timing is changed to n times the half track period, and the running speed of the magnetic tape T is changed as described above, so that even when the data rate of the input digital signal becomes lower than the standard data rate, Digital signals can be efficiently recorded on the magnetic tape T.

The signals recorded on the magnetic tape T are reproduced at the tape running speed at the time of recording, and the recorded digital signals can be reproduced through the above-mentioned signal reproducing system.

The signals recorded on the magnetic tape T as described above are reproduced by the above-mentioned rotary heads 7a to 7c during reproduction, and supplied to the above-mentioned signal reproduction system. In this signal reproducing system, for example, the above-described ID is detected from the recording signal demodulated by the deformatter 9, and the tape traveling speed at the time of recording is identified from the information signal contained therein. By supplying the magnetic tape T to the above-mentioned control means 14, the magnetic tape T is controlled to travel at the same traveling speed as during recording. The reproduced signal demodulated by the deformatter 9 is subjected to the above-described outer code correction and inner code correction processing, and is output from the output interface to a transmission path (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 provided on a magnetic tape T. The rotary drum 20 is shifted by an interval corresponding to the pitch of the recording track formed on the rotating drum 20.
In a magnetic recording / reproducing apparatus for recording and reproducing an input signal on a magnetic tape T by a rotary head disposed at a predetermined position, the magnetic tape T is driven at a predetermined first tape traveling speed and at a predetermined tape traveling speed. A tape running (/ driving) means 15 for switching the tape running speed to a second tape running speed of 1 / n (n is a natural number), and a desired input signal to the magnetic tape T and the tape running speed during recording; And a signal recorded on the magnetic tape T is reproduced based on the speed information signal during reproduction.

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

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

At this time, the user operates the input means 18 described above.
To input a command to record a digital signal at a first tape running speed which is a standard magnetic tape running speed. The input digital signal supplied to the above-described signal recording system is supplied to a head switch (not shown) as an amplified modulated digital signal through the above-described signal processing.

At the same time, the control means 14
Controls the tape driving means 15 based on this instruction input to cause the magnetic tape T to run at the first tape running speed. Here, the magnetic tape T is wound around the rotary drum 20 for approximately 180 °, and the standard magnetic tape running speed is the first tape running speed here, and the above-described rotary drum 20 During one rotation, one track pattern shown in FIG. 11 is formed.
When 0 is rotated once, the amount of movement of the magnetic tape required to form another track pattern at a position adjacent to the track pattern is defined.

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 via the input interface 1 described above are stored in the first memory unit 2 in the memory unit 2 at every track cycle synchronized with the rotation of the rotary drum 20. Writing is performed on a memory (one of a plurality of memories configured in the memory unit 2) (memory writing in FIG. 1; part a). An outer code generation circuit 3 generates an outer code for the digital signal stored in the next half-track cycle after writing to the memory, and supplies the outer code to the memory (outer code generation in the figure). On the other hand, writing is performed on another second memory in the above-mentioned memory unit 2 (memory writing in the figure; part b).

In the next half track cycle, an 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 on another third memory in the above-mentioned memory unit 2 (memory writing in the figure; part c).

Further, in the next half track cycle, the third
An 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 memory unit 2 (memory writing in FIG.
Part). At this time, when the digital signal to which the outer code is added is read from the first memory and the second memory, respectively, the digital signal is output to the inner code generation circuit 4.
At the same time, an inner code is added separately for the first system and the second system, and then, through the formatter 5 and the recording amplifier 6 described above (from inner code generation to recording modulation (first , The second system)) is recorded on the magnetic tape T as an amplified modulated digital signal (a recording signal in the figure). Thereafter, signal recording is performed on the magnetic tape T at this timing.

In practice, when the rotary head 7a having the first azimuth angle and the rotary head 7b having the second azimuth angle scan the magnetic tape T simultaneously according to the rotation of the rotary drum 20, the head changeover switch is set. By supplying the amplified modulated digital signal to each rotary head, the amplified modulated digital signal is recorded while sequentially forming a track pattern 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, the digital signal is set to one of the above standard magnetic tape running speeds.
A case where recording is performed at a tape traveling speed of / 2 will be described. At this time, it is assumed that the rotation speed of the rotary drum 20 is kept constant.

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

As shown in FIG. 12, the input digital signals (a to d) supplied through the input interface 1 are transmitted to the memory unit 2 at a track cycle synchronized with the rotation of the rotary drum 20. 1 memory (memory section 2
Is written into one of a plurality of memories (the memory write in FIG. 1; part a), and the signal stored in the first memory is held in the next half track cycle. Keep it done.

In the next half-track period, an 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-described memory unit 2 is written to another second memory (memory write in FIG. 2; part b). The signal stored in the second memory remains held until the next half track cycle.

The outer code for the signal stored in the second memory in the next half track cycle is
Is generated and supplied to this memory, while writing is performed on another third memory in the memory unit 2 (memory writing; c portion in the figure). At this time, the signal stored in the third memory remains held until the next track cycle.

Further, in the next half track cycle, the first and second
Digital signals are read out from the memory of each of the above, and recording modulation is performed together with inner code generation (from inner code generation to recording modulation;
(2nd series), and supply the obtained amplified modulated digital signals to a head changeover switch (not shown). At this time, the head switch switches the read first-order 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 a rotary head 7b having a second azimuth angle, and the rotary heads 7a and 7b record the signals on the magnetic tape T. Thereafter, signal recording is performed on the magnetic tape T at this timing.

That is, as shown in FIG. 12, the present magnetic recording / reproducing apparatus records a signal on the magnetic tape T every two cycles after a signal is written to 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 signals recorded on the magnetic tape T as described above are reproduced by the rotary heads 7a to 7c at the time of reproduction, and are supplied to the signal reproduction system described above. In this signal reproducing system, for example, the above-described ID is detected from the recording signal demodulated by the deformatter 9, and the tape traveling speed at the time of recording is identified from the information signal contained therein. By supplying the magnetic tape T to the above-mentioned control means 14, the magnetic tape T is controlled to travel at the same traveling speed as during recording. The reproduced signal demodulated by the deformatter 9 is subjected to the above-described outer code correction and inner code correction processing, and is output from the output interface to a transmission path (not shown) as an output digital signal.

(Third Embodiment) Next, a third embodiment of the present magnetic recording / reproducing apparatus will be described. First, heads 7a and 7d having a first azimuth angle and heads 7b and 7c having a second azimuth angle are provided. In a magnetic recording / reproducing apparatus for recording and reproducing an input signal on the magnetic tape T by a rotary head disposed on the rotary drum 21 by shifting the input signal by an interval corresponding to a pitch of a recording track formed on the magnetic tape T,
Tape running means 14 and 15 for switching the magnetic tape T to run at a predetermined first tape running speed and a second tape running speed which is twice the first tape running speed, respectively. A desired input signal and a speed information signal corresponding to the tape traveling speed are recorded on the magnetic tape T during recording, and are recorded on the magnetic tape T based on the speed information signal during reproduction. It is configured to reproduce a signal.

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

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

Now, a case will be described in which, for example, when a digital signal having a data rate A [Mbps] is supplied to the magnetic recording / reproducing apparatus, the digital signal is recorded at a standard magnetic tape running speed using this as a basic data rate. At this time, it is assumed that the rotation speed of the rotating drum 21 is kept constant.

At this time, the user operates the input means 18 described above.
To input a command to record a digital signal at a first tape running speed which is a standard magnetic tape running speed. The input digital signal supplied to the above-described signal recording system is supplied to a head switch (not shown) as an amplified modulated digital signal through the above-described signal processing.

At the same time, the control means 14
Controls the tape driving means 15 based on this instruction input to cause the magnetic tape T to run at the first tape running speed. Here, the magnetic tape T is wound around the rotary drum 21 over substantially 180 °, and the standard magnetic tape traveling speed is, for example, when the first combination head is rotated half a rotation of the rotary drum 21. The distance traveled while forming one track pattern on the magnetic tape T. That is, the first tape running speed mentioned here is such that one track pattern shown in FIG. 16 is formed while the above-mentioned rotary drum 21 makes one rotation, and this track pattern is formed next time the rotary drum 21 makes one rotation. Is the amount of movement of the magnetic tape T necessary 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 through the input interface 1 are transmitted to the first digital memory in the memory unit 2 at every track cycle synchronized with the rotation of the rotary drum 21. Writing is performed on a memory (one of a plurality of memories configured in the memory unit 2) (memory writing in FIG. 1; part a). An outer code generation circuit 3 generates an outer code for the digital signal stored in the next half-track cycle after writing to the memory, and supplies the outer code to the memory (outer code generation in the figure). On the other hand, writing is performed on another second memory in the above-mentioned memory unit 2 (memory writing in the figure; part b).

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

In the next half track cycle, the third
An 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 memory unit 2 (memory writing in FIG.
Part). Further, at this time, when the digital signals to which the outer code is added are read out from the first and second memories, respectively, the digital signals are simultaneously supplied to the inner code generation circuit 4 respectively, and are supplied to the first and second systems. After separately adding the inner codes, the signals are not shown as amplified and modulated digital signals via the formatter 5 and the recording amplifier 6 (inner code generation to recording modulation (first system, second system) in FIG. 1). It is supplied to the head changeover switch.

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

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

At this time, the user operates the input means 18 described above.
Input an instruction to record a digital signal at a second tape running speed (for example, twice the first tape running speed). The input digital signal supplied to the above-described signal recording system is output from the signal recording system through the above-described signal processing, and is supplied as an amplified modulation digital signal to a head switch (not shown). At the same time, the control means 14 controls the tape driving means 15 based on the instruction input to cause the magnetic tape T to run at the second tape running 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 via the input interface 1 described above are stored in the memory unit 2 at every track cycle synchronized with the rotation of the rotary drum 21. Writing is performed on a sixth memory (a plurality of memories configured in the memory unit 2) (memory writing in the figure; a to f portions). For example, an outer code is generated by the outer code generation circuit 3 for the digital signal stored in the next half-track cycle after writing to the first and fourth memories, respectively, and is stored in the first and fourth memories, respectively. Is supplied (outer code generation in the figure). On the other hand, at this timing, writing to the other second and fifth memories in the memory unit 2 is performed, respectively.

In the next half track cycle, the second and fifth
Outer codes for the digital signals respectively stored in the 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 on each of the third and sixth memories in the memory unit 2 described above.
At this time, the digital signals respectively stored in the first and fourth memories are divided into first and second streams, and the inner codes are respectively added thereto. Inner code generation-recording modulation (first system, second system)) is supplied to the head changeover switch as an amplified modulation digital signal and at the same time as the first or second combination head (for example, the first combination head at this time) ) (Recording signal (first system, second system)
system)).

Further, outer codes for the digital signals stored in the third and sixth memories are respectively generated by the outer code generation circuit 3 in the next half track cycle, and supplied to the third and sixth memories. Is done. On the other hand, the digital signals respectively stored in the second and fifth memories are read out by being divided into first and second streams, and subjected to the inner code generation to recording modulation as described above, and are converted into amplified modulation digital signals by the head. At the same time as being supplied to the changeover switch, for example, it is supplied to 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 switches and supplies the first and second combination heads to the first and second combination heads for the rotation of the rotary drum 21 at every half track cycle. At the synchronized timing, an amplified modulated digital signal to be recorded on the track pattern on the magnetic tape T shown in FIG. 18 is recorded.

At this time, since the magnetic tape T is traveling at the second tape traveling speed (twice the first tape traveling speed), for example, the first rotation of the rotary drum 21 causes the first and second rotations. The azimuth heads 7a and 7c form a track pattern on the magnetic tape T, and the first and second azimuth heads 7b and 7d form the next track pattern on the magnetic tape T in the next half rotation. 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 signals recorded on the magnetic tape T as described above are reproduced by the above-mentioned rotary heads 7a to 7d at the time of reproduction, and supplied to the above-mentioned signal reproduction system. In this signal reproducing system, for example, the above-described ID is detected from the recording signal demodulated by the deformatter 9, and the tape traveling speed at the time of recording is identified from the information signal contained therein. By supplying the magnetic tape T to the above-mentioned control means 14, the magnetic tape T is controlled to travel at the same traveling speed as during recording. The reproduced signal demodulated by the deformatter 9 is subjected to the above-described outer code correction and inner code correction processing, and is output from the output interface to a transmission path (not shown) as an output digital signal.

Here, the above-described outer code correction and inner code correction processing is not limited to the above-described method. For example, when the rotating head is accurately scanning the above-described track pattern, May write a signal in which the outer code correction and the inner code correction have been completed in the above-mentioned track cycle period in a memory, or, for example, whether or not the rotary head is scanning the above-mentioned track pattern accurately. Regardless, it is a matter of course that the signal for which the inner code correction has been completed is written to the memory, and the outer code correction may be performed when the data amount of the signal corresponding to one track period is written to 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] use the rotating drums 19 to 21 configured as described in the first to third embodiments, respectively. Thus, the recording speed can be efficiently recorded on the magnetic tape T by changing the traveling speed of the magnetic tape T while keeping the rotation speed of the rotating drum constant.

In the present magnetic recording / reproducing apparatus, the digital signal recorded on the magnetic tape T as described above is reproduced and demodulated by the above-described signal reproducing system, so that the digital signal is reproduced almost in the same manner 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, since the rotary head must always accurately scan a track pattern on a magnetic tape during reproduction, an arbitrary track (for example, a control track) on a magnetic tape can be used. ) Records and reproduces control signals. Therefore, in such a magnetic recording / reproducing apparatus, for example, this control signal is variable (for example, when a signal is recorded on a magnetic tape at the time of recording and when the signal is not recorded) (for example,
By changing the signal waveform or changing the duty ratio of the signal) and recording it on the control track on the magnetic tape, based on the detection of the control signal, only the track on which the signal is recorded is scanned to obtain a reproduced signal. Of course, the running time of the magnetic tape T may be measured, and the remaining amount of the magnetic tape T may be detected.

It is needless to say that the configuration of the rotary head described above is not limited to the one described above, and various cases are conceivable. Of course, by performing signal processing, an input digital signal supplied at a basic data rate or an input digital signal supplied at a different data rate may be recorded and reproduced, respectively.

[0087]

As described above, according to the configuration of the present invention, an input digital signal having a data rate different from the basic data rate is recorded with the data rate of a predetermined input digital signal as a basic data rate. At this time, by performing recording while varying the running speed of the magnetic tape according to the data rate, there is an effect that signals can be efficiently recorded on the magnetic tape.

At this time, the magnetic tape traveling speed when recording a predetermined input digital signal is defined as a first traveling speed, and the magnetic tape traveling speed when recording an input digital signal having a data rate different from this is used. The second
The speed information signal corresponding to each of the traveling speeds can be recorded together with the input digital signal.
By detecting and identifying this speed information signal, the recorded signal can be obtained as a reproduced digital signal substantially similar to the input digital signal.

Further, 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 signal recording and reproduction for an even multiple time in addition to the conventional signal recording and reproduction for an odd multiple time. effective.

Further, since the rotation of the rotary drum is constant during both recording and reproduction, the influence of the air film formed between the rotary drum and the magnetic tape, which is generated according to the change in the rotation speed of the rotary drum, is reduced. There is an effect that a complicated operation for adjusting a reproduction waveform and the like in accordance with a change in a magnetic reversal interval during reproduction is omitted.

As described above, according to the configuration of the second aspect of the present invention, in addition to the above-described effects, the combination head including at least the rotary heads having different azimuth angles is arranged on the rotary drum. Even when input digital signals of various data rates 1 / n (n is a natural number) smaller than the basic data rate are supplied, the tape running speed is varied, and the signals are more efficiently recorded on the magnetic tape. There is an effect that can be.

As described above, according to the configuration of the third aspect of the present invention, in addition to the above-described effects, a combination head including at least rotating heads having different azimuth angles is opposed to the rotating drum by 180 °. In this way, even when an input digital signal having a data rate twice that of the basic data rate is supplied, the tape running speed can be varied and the signal can be recorded on the magnetic tape more efficiently. There is an effect that can be.

[Brief description of the drawings]

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

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

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

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

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

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

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

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

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

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

FIG. 11 is a diagram illustrating a track pattern of a magnetic tape according to a second embodiment.

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

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

FIG. 14 is a view for explaining an arrangement of a rotary head in a third embodiment of the present magnetic recording / reproducing apparatus.

FIG. 15 is a diagram illustrating 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 in a third embodiment.

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

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Changeover switch (recording means) 2 Recording amplifier (recording means) 3 Changeover switch (recording means / detection means) 4a, 4b Magnetic head 6 Magnetic recording medium 8 Preamplifier (detection means) 9 Reproduction FM detector (detection means) 10 Control Means 11 Memory (Storage means) 12 Usage time detecting means

Claims (3)

(57) [Claims] 1. A magnetic recording / reproducing apparatus for recording and reproducing an input digital signal on a magnetic recording medium by using a head having a first azimuth angle and a head having a second azimuth angle mounted on a rotating drum which rotates constantly. In the method, the magnetic recording medium is driven to travel at a first traveling speed that is a predetermined reference, and the magnetic recording medium is moved to a first traveling speed.
Traveling means for driving at a second traveling speed which is 1 / n times or n times (n is a natural number) the traveling speed of the magnetic recording medium at the time of recording. Driving and recording an information signal corresponding to the first traveling speed and an input digital signal having a reference data rate; and driving and driving the magnetic recording medium 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 the input digital signal are recorded, and at the time of reproduction, the magnetic recording medium is reproduced based on the information signal reproduced from the magnetic recording medium. A magnetic recording / reproducing apparatus for reproducing a signal recorded on a magnetic recording / reproducing apparatus. Wherein the input digital by rotary head arranged on the rotary drum being shifted by distance corresponding to the pitch of the recording tracks formed on a first azimuth angle of the head and the second magnetic recording medium and the azimuth angle of the head In a magnetic recording / reproducing apparatus for recording and reproducing a signal on a magnetic recording medium, a predetermined first traveling speed of the magnetic recording medium;
Running means for switching to a second running speed that is 1 / n (n is a natural number) with respect to the first running speed, and running the magnetic recording medium at the first running speed during recording. In the traveling drive, the information signal corresponding to the first traveling speed and an input digital signal having a reference data rate are recorded, and the magnetic recording medium traveling drive 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 the input digital signal are recorded, and upon reproduction, the magnetic recording is performed based on the information signal reproduced from the magnetic recording medium. A magnetic recording / reproducing apparatus for reproducing a signal recorded on a medium. 3. A digital head having a first azimuth angle and a second azimuth angle which are shifted on a rotating drum by a distance 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, a predetermined first traveling speed of the magnetic recording medium;
Running means for switching to a second running speed which is twice as high as the first running speed, and running the magnetic recording medium at the first running speed during recording; Recording an information signal corresponding to a 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; A signal recorded on the magnetic recording medium based on the information signal reproduced from the magnetic recording medium upon recording an information signal corresponding to and an input digital signal having a data rate different from the input digital signal. A magnetic recording / reproducing apparatus for reproducing information.