JPH02179961A - Data recording/reproducing device - Google Patents

Abstract

PURPOSE:To prevent a magnetic tape and a recording/reproducing means from flawing due to friction between them by measuring the elapsing time after inputting a data recording/reproducing instruction to a control means and releasing the magnetic tape from its loading state when a predetermined period of time is passed. CONSTITUTION:In the data recording/reproducing device 1 for recording/ reproducing data by loading the magnetic tape 3 and sliding it in contact with the recording/reproducing means 10a and 10b, when the data recording/ reproducing instruction is inputted to the control means 4 for controlling the recording/reproducing of data, a time measuring means 6 is started on a time measuring operation. When the predetermined period of time is passed from the time measuring operation commencing time, the magnetic tape 3 is released from the loading state, and the magnetic tape 3 is separated from the recording/ reproducing means 10a and 10b. By this method, the magnetic tape 3 and the recording/reproducing means 10a and 10b are prevented from flawing due to friction between them, thus improving the reliability of the data recording/ reproducing device 1.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a data recording/reproducing apparatus such as a rotary head digital audio tape recorder (R-DAT) capable of recording/reproducing digital signals.

2. Description of the Related Art Conventionally, there have been data recording/reproducing apparatuses, such as R-DAT, which are capable of recording digital signals on magnetic tape. In such a data recording/reproducing device,
Error correction information (parity check code) is added to the data to be recorded, and even if some data is lost during reproduction, the original data can be reproduced by correction using the error correction information.

Problems to be Solved by the Invention When the above-mentioned R-DAT is used as an auxiliary storage device for a computer, for example, control commands from the computer, such as data recording commands or data reading commands, are not necessarily output at regular time intervals. Therefore, it is necessary to always keep the magnetic tape in a loading state (in sliding contact with the rotating drum) so that it can operate immediately when a control command is input.

The rotating drum in the loading state rotates at the same rotation speed as during normal operation, for example, 200 rpm,
If the magnetic tape and rotating drum are left in a loading state for a long time, there is a problem that the magnetic tape and the rotating drum are damaged by friction, and there is also a problem that the data recorded on the magnetic tape is destroyed.

An object of the present invention is to solve the above problems and provide a highly reliable data recording/reproducing device.

Means for Solving the Problems The present invention provides a data recording/reproducing method for recording/reproducing data by loading a magnetic tape and bringing it into sliding contact with a recording/reproducing means.
The playback device includes a timekeeping means for performing a timekeeping operation and a control means for controlling data recording/reproduction, and the timekeeping means measures the elapsed time after a data recording/reproduction instruction is input to the control means. This data recording/reproducing apparatus is characterized in that when a predetermined period of time has elapsed, the loading state of the magnetic tape is released and the magnetic tape is separated from the recording/reproducing means.

Effect According to the present invention, magnetic tape is loaded and recorded/recorded.
In a data recording/reproducing device that records/reproduces data by making sliding contact with a reproducing means, when a data recording/reproducing instruction is input to a control means for controlling data recording/reproducing,
The timekeeping means starts a timekeeping operation. When a predetermined period of time has elapsed from the start of the timing operation, the loading state of the magnetic tape is released and the magnetic tape is separated from the recording/reproducing means. That is, when the period from when a recording/playback instruction is input to the control means until the next recording/playback instruction is input exceeds a predetermined period, the loading state is canceled. This can prevent damage to the magnetic tape and recording/reproducing means due to friction.

Embodiment FIG. 1 is a block diagram showing the basic configuration of R-DATI according to an embodiment of the present invention.
1 is used as an auxiliary storage device for the external computer 2. When recording data from the external computer 2 on the magnetic tape 3, the external computer 2 provides a data write signal SW to the control section 4 via a line 11, and also provides data to the buffer 5 via a line 12.

When the data write signal SW is input, the control section 4 drives the magnetic tape drive means 11 to put the magnetic tape 3 into a loading state, and when the writing of data to the buffer 5 is completed, a write end signal is sent via the line 13. Give SWE to external computer 2. Counter 6 in control unit 4
At the time of recording, the timing operation starts from the output of the write end signal SWE, and is reset by the data write signal SW.

Since the data output speed from the external computer 2 and the data recording speed in R-DATI are different, the buffer 5 temporarily stores the data from the external computer 2 and responds to the control signal from the control unit 4. The data is given to the signal processing circuit 7. The signal processing circuit 7 adds a parity check code and a frame number in the DAT.

Such data is amplified by an amplifier 8 and recorded frame by frame on the magnetic tape 3 by magnetic heads 10a and 10b provided on a rotating drum. The frame refers to two frames formed by the magnetic heads 10a and 10b, respectively.
This is a recording area consisting of two tracks. The magnetic heads 10a, 10b are fixed to a cylindrical rotary drum 9, and the zero-rotation drum 9 is driven to rotate in the direction of arrow 12 by a motor (not shown) or the like.

When reproducing the magnetic chip 73, the external computer 2 provides a data read signal SR to the 88 section 4 via the line 11. When the data read signal SR is input, the control section 4 drives the magnetic tape drive means 11 to put the magnetic tape 3 in a loading state, and reproduces the data recorded on the magnetic tape 3. At this time, the magnetic heads 10a and 10b each reproduce the tracks formed by the magnetic heads 10a and 10b during recording. Magnetic heads 10a, 10b
The data signal read out by is given to the amplifier 8,
The data signal amplified by the amplifier 8 is given to the signal processing circuit 7.

In the signal processing circuit 7, errors are corrected using a parity check code added during recording, and frame numbers are detected. Since the data read speed in R-DATI and the data read speed in the external computer 2 are different, the data output from the signal processing circuit 7 is temporarily stored in the buffer 5 and is processed based on the control signal from the control unit 4. and is output to the external computer 2 via line 12. Further, when the writing of the data read from the magnetic tape 3 to the buffer 5 is completed, the control unit 4
A read end signal SRE is output to the external computer 2 via line 13. During playback, the counter 6 in the control section 4 starts its timekeeping operation when the read end signal SPE is output, and is reset by the data read signal SR.

FIG. 2 is a flow chart for explaining the R-DATI recording operation, and FIG. 3 is a timing chart for explaining the recording operation. In step n1, it is determined whether a data write signal SW as a recording command has been input. The data write signal SW is shown in Fig. 3 (1).
As shown in FIG.
As shown in Figure (2), data Di (i=1.2.
) is also given to the buffer 5 from the external computer 2.

When the data write signal SW is input, the process proceeds to step n2, the counter 6 in the control section 4 is reset, and it is determined in step n3 whether or not it is in the loading state.

If it is in the loading state, the process proceeds to step n4, and if it is not in the loading state, the magnetic tape drive means 11 is driven in step n5 to bring the magnetic tape 3 into the loading state, and the magnetic heads 10a and 10b move over the magnetic tape 3.
After scanning and detecting a track in which the frame number stored by the control section 4 is recorded, and making it possible to record the data Di on and after this track, the process proceeds to step n4.

In step n4, data Di is written to the buffer 5, and in step n6, it is determined whether the number of data written to the buffer 5 is equal to or larger than a reference capacity, for example, 172 of the storage capacity of the buffer 5. be done.

If the reference capacity has not been reached, proceed to step n7, and the third
The write end signal SWE shown in FIG. 3 is outputted to the external computer 2, and in step n8, the counter 6 performs a timing operation for the period Ti shown in FIG. In step n9, it is determined whether the period Ti has elapsed for a certain period or not, and if it has not elapsed, the process proceeds to step nl.

It is determined in step 1 whether the next data write signal SW has been input. If the data write signal SW is input, the process returns to step n2, and if it is not input, the process returns to step n9. When a certain period of time has elapsed in step n9, the process proceeds to step nil, where the data Di in the buffer 5 is recorded on the magnetic tape 3.

Thereafter, in step n12, the loading state is canceled and the process returns to step n1. When canceling the loading state in step n12, the frame number of the track on which data was last recorded is stored.

If the number of data in the buffer 5 is equal to or greater than the reference capacity in step n6, the process proceeds to step n13, where data Di is recorded on the magnetic tape 3. When the recording of data onto the magnetic tape 3 is completed, a write end signal SWE is outputted in step n14, and the counter 6 performs a timing operation for a period Ti in step n15.

In step n16, it is determined whether or not the period Ti has elapsed for a certain period. If it has not elapsed, it is determined in step n17 whether or not the next data write signal SW has been input.

If the data write signal SW is input, the process returns to step n2, and if it is not input, the process returns to step n16. When a certain period of time has passed in step n16, step n1
At step 8, the loading state is released and the process returns to step n1. When canceling the loading state in step n18, the frame number is memorized as in step n12.

In this way, the data Di is first stored in the buffer 5, and when the number of data exceeds a predetermined reference capacity, or after the write end signal SWE is output and until the next data write signal SW is input. The information is recorded on the magnetic tape 3 when the period T1 has exceeded a predetermined period. At this time, when the period Ti has passed the above-mentioned certain period, the loading state of the magnetic tape 3 is released.

In this case, since the frame number of the track on which data was last recorded is stored, when the magnetic tape 3 is loaded again and a recording operation is performed, data can be recorded on the above-mentioned track or later, resulting in data loss, etc. is prevented.

FIG. 4 is a flowchart for explaining the reproduction operation of R-DATI, and FIG. 5 is a timing chart for explaining the reproduction operation. In step m1, it is determined whether a data read signal SR as a reproduction command has been input. The data read signal SR is output from the external computer 2 at time ti (i=1.2...) as shown in FIG. 5(1). When the data read signal SR is input, the process proceeds to step m2, where the control unit 4
The counter 6 is reset, and it is determined in step m3 whether or not it is in a loading state. If it is in the loading state, the process proceeds to step m4, and if it is not in the loading state, in step m5, the magnetic tape drive means 11
is driven to place the magnetic tape 3 in a loading state, the magnetic tape 3 is scanned by the magnetic heads 10a and 10b, the track in which the frame number stored in the control unit 4 is recorded is detected, and the track after this track is scanned. After enabling reproduction, the process advances to step m4.

In step m4, data Di (i=1.2...) is read from the magnetic tape 3 and written into the buffer 5, as shown in FIG. 5(2). When the writing of the data Di to the buffer 5 is completed, the process proceeds to step m6, and the number of data is written to the reference capacity, for example, 1 of the storage capacity of the buffer 5.
It is determined whether the capacity is equal to or greater than /2.

If the standard capacity has not been reached, proceed to step m7, and the fifth
The read end signal SRE shown in FIG. 3 is outputted to the external computer 2, and in step m8, the counter 6 performs a timing operation for the period Ti shown in FIG. In step m9, it is determined whether the period T1 has elapsed for a certain period of time, and if it has not elapsed, the process proceeds to step ml.

At , it is determined whether the next data read signal SR has been input. When the data read signal SR is input, the process returns to step m2, and when the data read signal SR is not input, the process returns to step m2.
Return to 9.

When a certain period of time has passed in step m9, step m
11, the data D1 is output to the external computer 2, and after the loading state is canceled in step m12, the process returns to step m1. When canceling the loading state in step m12, the frame number of the last reproduced track is memorized.

If the number of data is equal to or greater than the reference capacity in step m6, the process advances to step m13 and the data Di is output to the external computer 2. When the output of the data Di is completed, the control unit 4 sends a read end signal SR in step m14.
E is output, and in step m15, the counter 6 performs a timing operation for the period Ti.

In step m16, it is determined whether the period Ti has elapsed over a certain period, and if it has not elapsed, step m
At step 17, it is determined whether the data read signal SR has been input. When the data read signal SR is input, the process returns to step m2, and when the data read signal SR is not input, the process returns to step m2.
Return to 16.

When a certain period of time has elapsed in step m16, the process advances to step m18, where the loading state is canceled and step m
Return to 1. When canceling loading in step m18, the frame number is memorized as in step m12.

In this way, during reproduction, the data Di is first stored in the buffer 5, and when the number of data exceeds a predetermined reference capacity, or after the read end signal SRE is output, the next data read signal SR is stored. The information is given to the external computer 2 when the period Ti until input exceeds a predetermined fixed period. At this time, the period Ti
When the period of time has elapsed, the loading state of the magnetic tape 3 is released. In this case, since the frame number of the last played track is memorized, when the magnetic tape 3 is loaded again and the playback operation is performed,
Tracks subsequent to the above can be played back, and data loss and duplication are prevented.

As described above, according to this embodiment, damage to the magnetic tape 3 and the rotating drum due to friction can be prevented.

As a result, the life of the magnetic tape 3 and the rotating drum 9 can be extended, and the durability of the R-DATI is improved. Further, the data recorded on the magnetic chip 13 is prevented from being destroyed by friction with the rotating drum 9, and the reliability of the R-DATl in recording/reproducing data can be significantly improved.

Effects of the Invention As described above, according to the present invention, data can be recorded by loading a magnetic tape and sliding it into contact with the recording/playback instructions. /In a data recording/playback device that performs playback, if the period from when a recording/playback instruction is input to the control means until the next recording/playback instruction is input exceeds a predetermined period,
The loading state is canceled. As a result, damage to the magnetic tape and the recording/reproducing means due to friction can be prevented, and the reliability of the data recording/reproducing apparatus is greatly improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the basic configuration of R-DATI according to an embodiment of the present invention, FIG. 2 is a flowchart for explaining the recording operation in R-DATl, and FIG. 3 is a block diagram showing the basic configuration of R-DATI according to an embodiment of the present invention.
FIG. 4 is a timing chart for explaining the recording operation in ATl, FIG. 4 is a flowchart for explaining the reproducing operation in R-DATI, and FIG. 5 is a timing chart for explaining the reproducing operation in R-DATI. 1...R-DAT, 2...External computer, 3.
...Magnetic tape, 4...Control unit, 5...Buffer,
6... Counter, 7... Signal processing circuit, 8... Amplifier, 9... Rotating drum, 10a, 10b... Magnetic head, 11... Magnetic tape drive means, Dl... Data , SR...data read signal, SRE...read end signal, SW...data write signal, SWE...
・Writing end signal Agent Patent attorney Kei Saikyo Part 1 Figure 1

Claims (1)

[Scope of Claims] A data recording/reproducing device that records/reproduces data by loading a magnetic tape and bringing it into sliding contact with a recording/reproducing means, comprising: a timekeeping means for performing a timekeeping operation; and a timekeeping means for controlling data recording/reproduction. and a control means for measuring the elapsed time since a data recording/reproduction instruction is input to the control means, and releasing the loading state of the magnetic tape when a predetermined period has elapsed. A data recording/reproducing device characterized in that the data recording/reproducing device is separated from the recording/reproducing means.