JPH05250859A - Data reproducing device - Google Patents

Abstract

PURPOSE:To surely reproduce the information of a data track formed on a magnetic tape by easily correcting positional information even when reproducing position information is not read from a position information track formed in the longitudinal direction of the magnetic tape. CONSTITUTION:When a servo circuit for servo-controlling a capstan 8 is in an unlocked state, an IDR signal outputted from an IDR reproducing section 2 by a locking/unlocking time switching section 6, that is, an IDR signal corrected to become a correct value by the traveling speed of a magnetic tape 7 is selected and the signal is outputted as a correct IDR signal. Also, when the capstan 8 is in a locked state, an IDR signal outputted from a locking time processing section 5, that is, an IDR corrected to become a correct value with continuity identified is selected and the signal is outputted as a correct IDR signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data reproducing apparatus for reproducing data recorded on a magnetic tape in a format such as ID-1 format.

[0002]

2. Description of the Related Art Conventionally, in a video tape recorder (VTR) configured to record and reproduce a video signal by helically scanning a magnetic tape with a rotary head, a helical recording track is used as a video track of the magnetic tape. An audio signal, a control signal, a time record, etc. are recorded and reproduced on a plurality of longitudinal tracks formed along the longitudinal direction.

In practice, in a VTR, for example, a pulse signal or the like corresponding to the position of a video track is recorded as a control signal, and by reproducing this control signal, for example, the running system of a magnetic tape or the scan timing of a rotary head, etc. Are configured to be servo controlled.

Also, as the time code, absolute time information of the video track and the like are recorded, and it is constructed so that the position of the desired video track can be detected and the editing and cueing work can be performed with high accuracy. ing. Such a VTR
If, for example, the time code cannot be played back correctly due to dropout, etc., the time code can be corrected according to the timing of the control signal that is played back at the same time. Prevent.

By the way, conventionally, the so-called ID-1 format (American National Standa) was used to record and reproduce desired information data on a magnetic tape by using the format of SMPTE I-1 digital VTR.
rd for Information Systems 19-mm Type ID ー 1 Recorded
Instrumentation Digital Cassette Tape Format
ANSI X3.175-1990) data recorder has been proposed.

In practice, in the ID-1 format, the helical recording tracks of the magnetic tape 101 are replaced by the data tracks TRO, TR1, TR as shown in FIG. 6 (a).
2, TR3 is configured to record and reproduce desired information data, and the data tracks TRO, T
A control signal track C arranged along the longitudinal direction of the magnetic tape 101 on the lower end side of R1, TR2, TR3.
A TL and a time code track TC are formed.

In the case of this ID-1 format, the time code track TC is constructed so that the user can use it arbitrarily, and the control signal track CTL is constructed by 4 bits as shown in FIG. 6 (b). The sync data SYNC representing the breaks T1 and T2 of the four data tracks TRO to TR3 is recorded between the 2nd bit and the 3rd bit, and 28 bits are identified between these sync data SYNCs. Data is recorded.

In practice, as this identification data, track set identification data TRID numbered from the beginning for each of four data tracks TRO, TR1, TR2, TR3 is recorded in 23 bits following the synchronization data SYNC, Home track identification data HTID representing, for example, information of the recording head is recorded in the subsequent 4 bits, and further, 1-bit even parity PR is added subsequently.

Therefore, the ID-1 format data recorder reproduces the sync data SYNC recorded in the control signal track CTL to obtain V
The magnetic tape 10 as well as the control signal in TR
It is possible to servo-control the traveling timing of No. 1 and the scan timing of the rotary head.

Also, by reproducing the track set identification data TRID, the home track identification data HTID, and the even parity PR recorded on the control signal track CTL, the desired data tracks TRO, TR1, TR2 as well as the time code in the VTR are reproduced. , TR
By detecting the position of No. 3, it is possible to perform editing, cueing work, and the like with high accuracy.

[0011]

By the way, the above-mentioned I
In the data recorder of D-1 format, VTR
Since the function similar to that of the control signal and time code in FIG. 3 is realized only by the recording information of the control signal track CTL, when dropout or the like occurs, the track set identification data TRID,
Home track identification data HTID, even parity PR
May not be reproduced.

In practice, the control signal track CTL
When a read error occurs in the track set identification data TRID, home track identification data HTID, and even parity PR, the sync data SYNC of the control signal track CTL is highly likely to be unable to be reproduced correctly. It cannot be corrected using the SYNC timing, and track set identification data TRID and home track identification data HTI
There is a problem that D and even parity PR cannot be reproduced.

In order to solve such a problem, V which is superimposed on the video signal in the vertical synchronization period and recorded on the video track is used.
TR time code (VITC (Vertical Interval)
Time code)) and the same time code as the magnetic tape TP
It is conceivable to record on the data tracks TRO, TR1, TR2, and TR3.

By doing so, even if the track set identification data TRID, the home track identification data HTID, and the even parity PR of the control signal track CTL cannot be reproduced correctly, the data tracks TR0, T0.
Track set identification data TRI is recorded at a timing based on the time code recorded in R1, TR2, and TR3.
D, home track identification data HTID, and even parity PR can be corrected.

However, in this way, the data track TR
When a time code similar to VITC is recorded on 0, TR1, TR2, and TR3 and is reproduced, a processing circuit for recording / reproducing information data requires a circuit for recording / reproducing time code. However, there is a problem that the circuit configuration is complicated and the size is increased.

In view of the above-mentioned circumstances, the present invention can easily correct the position information even if the reproduction position information cannot be read from the position information track formed in the longitudinal direction of the magnetic tape. It is an object of the present invention to provide a data reproducing device capable of surely reproducing information on a formed data track.

[0017]

To achieve the above object, a data reproducing apparatus according to the present invention is formed in the longitudinal direction of a magnetic tape wound by a tape reel and driven by a capstan. In a data reproducing device for reproducing a position information track in which position information of a tape is recorded, the continuity of reproduction position information obtained by reproducing the position information track of the magnetic tape is determined,
If it is continuous, the reproduction position information is output, and if it is discontinuous, a first reproduction position information correction unit that corrects and outputs the reproduction position information output last time; and the position of the magnetic tape. The first clock signal is generated based on the reproduction position information obtained by reproducing the information track, and the second clock signal is generated based on the rotation frequency of the tape reel. Count information corresponding to the number of updates of the position information is generated based on the two-clock signal, and when the reproduction position information cannot be obtained, the count information is used to correct and output the reproduction position information. 2 When the reproduction position information correction unit and the servo circuit that controls the rotation of the capstan are locked, the output signal of the first reproduction position information correction unit is selectively output. Wherein when the servo circuit is unlocked is characterized in that a signal selection section for selectively outputting an output signal of said second playback position information correction unit.

[0018]

In the above structure, the continuity of the reproduction position information obtained by reproducing the position information track of the magnetic tape is determined by the first reproduction position information correction section, and if this is continuous, the reproduction position information is determined. When the information is output and is discontinuous, the reproduction position information output last time is corrected and output, and it is obtained by reproducing the position information track of the magnetic tape by the second reproduction position information correction unit. A first clock signal is generated based on the reproduction position information, and a second clock signal is generated based on the rotation frequency of the tape reel.
Count information corresponding to the number of updates of the position information is generated based on the clock signal and the second clock signal,
When the reproduction position information cannot be obtained, the reproduction position information is corrected and output based on the count information,
When the servo circuit that controls the rotation of the capstan is locked by the signal selection unit, the output signal of the first reproduction position information correction unit is selectively output, and when the servo circuit is unlocked, the first signal is output. 2 The output signal of the reproduction position information correction unit is selectively output.

[0019]

1 is a block diagram showing an embodiment of a data reproducing apparatus according to the present invention.

The data reproducing apparatus shown in this figure has a head unit 1.
It includes an IDR playback unit 2, a tape rotation detection unit 3, a tape running amount calculation unit 4, a lock time processing unit 5, and a lock / unlock switching unit 6, and the capstan 8 is locked. If not, the contents of the control signal track CTL of the magnetic tape 7 are read by the head unit 1, and when a correct IDR signal (reproduction position information) is obtained by this reading operation, this IDR signal is output, and When the correct IDR signal cannot be obtained by the read operation, the IDR signal obtained by the previous read operation is corrected based on the running amount of the magnetic tape 7 and output as the IDR signal. When the capstan 8 is in the locked state, it is determined whether the IDR signal obtained by the read operation is continuous with the previous IDR signal and the IDR signal two times before, and these are continuously determined. Output the IDR signal obtained by the read operation, and correct the previous IDR signal when the IDR signal obtained by the read operation is not continuous with the previous IDR signal and the IDR signal two times before. Then, this is output as an IDR signal.

The head part 1 is wound around the drum 13 obliquely by the respective tilt guides 11 and 12 while being fed from the supply reel 10 of the tape cassette 9.
The magnetic tape 7 is provided with a CTL head 15 arranged so as to come into contact with a control signal track CTL of the magnetic tape 7 which is driven by the capstan 8 and wound on the take-up reel 14 of the hand tape cassette 9. When running, the contents of the control signal track CTL of the magnetic tape 7 are read, and the reproduction signal obtained by this reading operation is supplied to the IDR reproducing unit 2.

As shown in FIG. 2, the IDR reproducing section 2 includes a decoder circuit 18, a counter circuit 19, and a difference calculation circuit 20.
An error detection circuit 21, a difference calculation circuit 22, an addition circuit 23, a first selection circuit 24, and a latch circuit 25. The reproduction signal output from the head unit 1 is decoded to perform IDR. While reproducing the signal, it is determined whether or not the IDR signal is within the correct range based on the tape speed detection signal supplied from the tape running amount calculation unit 4, and when this is within the correct range,
The IDR signal output from the decoder circuit 18 is supplied to the lock / unlock switching unit 6, and when the IDR signal output from the decoder circuit 18 is not within the correct range, the tape running amount calculation unit The IDR signal output from the decoder circuit 18 is corrected on the basis of the tape running amount signal (a signal indicating the number of updates of the IDR signal) output from No. 4 and is used as an IDR signal for locking / unlocking switching unit 6 Supply to.

The decoder circuit 18 decodes the reproduced signal output from the head unit 1 to determine the timing of the sync data SYNC and the track set identification data TRID, home track identification data HTID, and even paridi PR which are delimited by the sync data SYNC. The track set identification data TRID and the home track identification data HT based on the even parity PR.
Determine if the ID has a parity error,
When these do not cause a parity error, it is determined that a read signal read error due to dropout or the like has not occurred, and the track set identification data TRID and home track identification data HTID obtained by decoding the current playback signal are obtained. , Even parity PR for this IDR
A counter circuit 19 as a signal, a difference calculation circuit 20,
The bit clock signal is supplied to the first selection circuit 24 and the lock time processing unit 5, and the bit number of the synchronization data SYNC is multiplied by 16 to generate the bit clock signal, which is supplied to the counter circuit 19. Also, the track set identification data T
When the RID and the home track identification data HTID have a parity error, it is determined that a read signal read error due to dropout or the like has occurred, and the track set identification data TRID, home obtained by decoding the current read signal Track identification data HTID,
A counter circuit 19, a difference calculation circuit 20, a first selection circuit 24, and a previous IDR signal obtained when the previous reproduction signal is decoded by invalidating the even parity PR.
In addition to supplying it to the lock time processing unit 5, a bit clock signal in which the number of bits of the synchronization data SYNC is multiplied by 16 is generated and supplied to the counter circuit 19.

The counter circuit 19 is the decoder circuit 18
Each time the synchronous data SYNC of the IDR signal is output from, the counting result so far is cleared, the counting operation is started, and the bit clock signal output from the decoder circuit 18 is counted, and the counting operation is performed. The calculated count value data is supplied to the tape running amount calculation unit 4 as a tape running amount signal.

Further, the difference calculation circuit 20 takes in the IDR signal output from the decoder circuit 18 and calculates the difference between the IDR signal up to that time and the IDR signal this time,
The difference data obtained by this arithmetic operation is supplied to the error detection circuit 21.

The error detection circuit 21 generates a difference reference value on the basis of the running speed of the magnetic tape 7 indicated by the tape speed detection signal supplied from the tape running amount calculating section 4 and, as shown in FIG. Arithmetic circuit 20
When the value of the difference data output from is within the range indicated by the difference reference value (within the difference reference range), the value of the difference data is out of the difference reference range, It is determined that a read signal reading error due to dropout or the like has occurred, a switch switching signal is generated, and this is supplied to the first selection circuit 24.

The difference calculation circuit 22 also outputs the current tape running amount signal output from the tape running amount calculating unit 4,
The difference from the previous tape running amount signal is calculated to obtain the tape running amount from the time when the previous control signal track CTL is read to the time when the current control signal track CTL is read, and this is added as the tape running amount difference signal. 23.

The adder circuit 23 compares the value of the previous IDR signal output from the latch circuit 25 with the difference calculation circuit 2
The value of the tape running distance difference signal output from No. 2 is added to predict the value of the current IDR signal, and this is supplied to the first selection circuit 24.

The first selection circuit 24 has two terminals 26a, 2
6b and a switch 26 having one common terminal 26c, and when the switch detection signal is not output from the error detection circuit 21, the common terminal 26c and
When one terminal 26a is connected, the current IDR signal output from the decoder circuit 18 is selected, this is supplied to the latch circuit 25, and when the error detection circuit 21 outputs the switch switching signal. , Common terminal 2
6c is connected to the other terminal 26b to add the adder circuit 2
The IDR signal of this time obtained by the predicting operation output from 3 is selected, and this is supplied to the latch circuit 25.

The latch circuit 25 latches the current IDR signal output from the first selection circuit 24 and supplies it to the adder circuit 23, and at the time of locking as the IDR signal obtained by the current reproduction operation. It is supplied to the switching unit 6 when unlocked.

The tape rotation detector 3 includes a frequency generator 30 for detecting the rotation of the supply reel 10 of the tape cassette 9 and a frequency generator 31 for detecting the rotation of the take-up reel 14 of the tape cassette 9. When the magnetic tape 7 of the tape cassette 9 is driven to run, a pulse signal having a frequency corresponding to the rotation of the supply reel 10 is generated and supplied to the tape running amount calculation unit 4, A pulse signal having a frequency corresponding to the rotation of the take-up reel 14 is generated and supplied to the tape running amount calculation unit 4.

As shown in FIG. 3, the tape running amount calculation unit 4 includes a take-up reel side counter circuit 32, a supply reel side counter circuit 33, a tape winding diameter detection circuit 34, and a division circuit 35.
, Tape speed detection circuit 36, and CTL presence / absence detection circuit 3
7, a second selection circuit 38, and an ID counter circuit 39, and calculates the tape running amount based on the pulse signals output from the frequency generators 30 and 31 of the tape rotation detection unit 3. At the same time, it is determined whether the correct IDR signal is output from the IDR reproducing unit 2 based on the tape running amount and the tape running amount signal output from the IDR reproducing unit 2, and the IDR reproducing unit 2 determines whether the correct IDR signal is output. When the IDR signal is output, the ID
The tape running amount signal output from the R reproducing unit 2 is selected and supplied to the IDR reproducing unit 2 and the next stage circuit (not shown), and the correct I signal from the IDR reproducing unit 2 is selected.
When the DR signal is not output, the tape running amount signal obtained based on each of the pulse signals is selected, and the selected tape running amount signal is fed to the IDR reproducing unit 2 and the next stage circuit (not shown).
And supply to.

The take-up reel side counter circuit 32 is one frequency generator 3 provided in the tape rotation detecting section 3.
The pulse signal output from the tape cassette 1 is counted to generate a rotation speed detection signal indicating the rotation speed of the take-up reel 14 provided in the tape cassette 9, which is detected by the tape winding diameter detection circuit 34 and the tape speed detection circuit. It is supplied to the circuit 36 and the division circuit 35.

The supply reel side counter circuit 33 counts the pulse signal output from the other frequency generator 30 provided in the tape rotation detecting section 3 and supplies the supply reel provided in the tape cassette 9. A rotation speed detection signal indicating the rotation speed of 10 is generated and supplied to the tape winding diameter detection circuit 34.

The tape winding diameter detection circuit 34 compares the rotation speed detection signal output from the take-up reel side counter circuit 32 with the rotation speed detection signal output from the supply reel side counter circuit 33 to perform the winding operation. The tape winding diameter on the side of the take-up reel 14 is calculated, and the tape winding diameter detection signal obtained by this calculation operation is supplied to the division circuit 35 and the tape speed detection circuit 36.

The division circuit 35 is the tape winding diameter detection circuit 3 described above.
4 is divided by the value of the tape winding diameter detection signal output from the winding reel side counter circuit 32 to generate a tape running amount signal indicating the running amount of the magnetic tape 7. Then, this is supplied to the second selection circuit 38.

Further, the tape speed detection circuit 36 has a value of the tape winding diameter detection signal output from the tape winding diameter detection circuit 34 and a value of the rotation speed detection signal output from the take-up reel side counter circuit 32. The running speed of the magnetic tape 7 is calculated based on the above, and the tape running speed detection signal obtained by this operation is supplied to the CTL presence / absence detecting circuit 37 and the error detecting circuit 21 of the IDR reproducing section 2.

In the CTL presence / absence detecting circuit 37, the value of the tape running speed detection signal output from the tape speed detecting circuit 36 corresponds to the value of the tape running amount signal output from the counter circuit 19 of the IDR reproducing section 2. It is determined whether or not the magnetic tape 7
It is determined that the contents of the control signal track CTL of No. 1 have not been accurately read, a switch switching signal is generated, and this is supplied to the second selection circuit 38.

The second selection circuit 38 has two terminals 40a, 4
0b and a switch 40 having one common terminal 40c. When the switch switching signal is not output from the CTL presence / absence detection circuit 37, the common terminal 40c is provided.
And one of the terminals 40a are connected to each other to connect the IDR reproducing unit 2
The tape running amount signal output from the counter circuit 19 is selected and supplied to the ID counter circuit 39, and when the switch switching signal is output from the CTL presence / absence detection circuit 37, the common terminal 40c and the other terminal Terminal 4
0b is connected to select the tape running amount signal output from the division circuit 35, and this is supplied to the ID counter circuit 39.

The ID counter circuit 39 is constructed so as to be cleared in synchronization with the counter circuit 19, and takes in the tape running amount signal output from the second selection circuit 38, counts it, and counts it to generate an IDR signal. Is generated and a tape running amount signal indicating the number of updates up to the current IDR signal is generated and supplied to the difference calculation circuit 22 of the IDR reproducing unit 2 and the next-stage circuit.

As shown in FIG. 4, the lock time processing section 5 includes a 1 / n frequency dividing circuit 43, three latch circuits 44 and 45,
46, two constant generation circuits 47 and 48, two addition circuits 49 and 50, a comparator circuit 51, and a counter circuit 52, and are output from the decoder circuit 18 of the IDR reproducing unit 2. It is determined whether or not the current IDR signal has a continuous value with respect to the previous IDR signal and the IDR signal two times before, and if these are continuous, the current IDR signal is selected and locked / unlocked. If the current IDR signal, the previous IDR signal, and the IDR signal two times before are not consecutive values, the value is supplied to the previous IDR signal and "1" is added to this. An IDR signal is supplied to the lock / unlock switching unit 6.

The 1 / n frequency dividing circuit 43 takes in a sampling signal having a frequency of n times the increased frequency of the IDR signal, divides this by 1 / n to generate a clock signal, and latches this clock signal. It is supplied to the circuits 44 to 46 and the counter circuit 52.

The first-stage latch circuit 44 outputs the ID signal every time a clock signal is output from the 1 / n frequency divider circuit 43.
The IDR signal output from the decoder circuit 18 of the R reproducing unit 2 is latched and supplied to the second stage latch circuit 45, the comparator circuit 51, and the counter circuit 52.

The latch circuit 45 in the second stage latches the IDR signal output from the latch circuit 44 in the first stage every time the clock signal is output from the 1 / n frequency divider circuit 43, and outputs the IDR signal. The previous IDR signal is supplied to the third stage latch circuit 46 and one adder circuit 49.

The latch circuit 46 of the third stage latches the IDR signal output from the latch circuit 45 of the second stage every time the clock signal is output from the 1 / n frequency divider circuit 43, and outputs the IDR signal. It is supplied to the other adder circuit 50 as the IDR signal of the previous two times.

The constant generating circuits 47 and 48 generate preset constant values "1" and "2", respectively, and supply them to the adding circuits 49 and 50, respectively.

Each of the adding circuits 49 and 50 has a constant value "1" output from the constant generating circuits 47 and 48, respectively.
"2" and the latch circuits 45 and 46 of the second and third stages
If the IDR signals obtained by this addition operation, that is, the current IDR signals output from the latch circuit 44 are correct values, the same value as the IDR signals. Two IDRs
A signal is generated and supplied to the comparator circuit 51.

The comparator circuit 51 compares the value of the IDR signal output from the latch circuit 44 of the first stage with the value of each IDR signal output from each of the adder circuits 49 and 50, and outputs each of these IDR signals. When the values of 1 and 2 match, it is determined that the value of the current IDR signal output from the decoder circuit 18, the value of the previous IDR signal, and the value of the IDR signal two times before are continuous, and the load command signal is output. It is generated and supplied to the counter circuit 52.

The counter circuit 52 is the 1 / n frequency dividing circuit 4
Every time a clock signal is output from the circuit 3, it is checked whether the load command signal is output from the comparator circuit 51. When the load command signal is output, the output from the first stage latch circuit 44 is performed. The IDR signal of this time is taken and supplied to the lock / unlock switching unit 6, and the comparator circuit 5
When the load command signal is not output from 1, "1" is added to the value of the previous IDR signal, and the IDR signal obtained by this addition operation is used as the current IDR signal in the lock / unlock switching unit 6. Supply.

The lock / unlock switching unit 6 is composed of a switch 50 having two terminals 50a and 50b and one common terminal 50c. When the capstan 8 is not in the locked state, Common terminal 5
0c and one terminal 50a are connected to select the current IDR signal output from the latch circuit 25 of the IDR reproducing unit 2 and output it to the next-stage circuit, and the capstan 8 causes the servo to move. After the preset time, for example, the time required for the comparator circuit 51 to complete the first continuity determination after the lock has passed, the common terminal 50c and the other terminal 50b are connected to each other, and The IDR signal output from the counter circuit 52 is selected and output to the next stage circuit.

As a result, when the capstan 8 is servo-locked, even if a read error occurs by the head unit 1, the IDR signal of the previous two times, the ID of the previous time, and the ID of the previous time.
The R signal and the IDR signal of this time can be consecutive values.

As described above, in this embodiment, when the capstan 8 is not in the locked state, the IDR
The IDR signal output from the reproducing unit 2 is selected and supplied as the current IDR signal to the next-stage circuit. When the capstan 8 is in the locked state, the IDR signal output from the lock time processing unit 5 is output. Since the signal is selected and supplied as the IDR signal of this time to the next stage circuit, the position information can be easily read even if the reproduction position information cannot be read from the position information track formed in the longitudinal direction of the magnetic tape 7. Therefore, the information on the data track formed on the magnetic tape 7 can be reliably reproduced.

[0053]

As described above, according to the present invention, the position information can be easily corrected even when the reproduction position information cannot be read from the position information track formed in the longitudinal direction of the magnetic tape. Thus, the information on the data track formed on the magnetic tape can be reliably reproduced.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a data reproducing device according to the present invention.

2 is a block diagram showing a detailed circuit configuration example of an IDR reproducing unit shown in FIG. 1. FIG.

FIG. 3 is a block diagram showing a detailed circuit configuration example of a tape running amount calculation unit shown in FIG.

FIG. 4 is a block diagram showing a detailed circuit configuration example of a lock time processing unit shown in FIG. 1.

5 is a schematic diagram showing an operation example of the error detection circuit shown in FIG.

FIG. 6 is a schematic diagram showing a configuration example on a CTL track in a general ID-1 format.

[Explanation of symbols]

1 head section 2 IDR reproducing section (second reproducing position information correcting section) 3 tape rotation detecting section 4 tape running amount calculating section 5 lock time processing section (first reproducing position information correcting section) 6 lock time / unlock time switching section (Signal selection section) 7 Magnetic tape 8 Capstan 10 Tape reel (Supply reel) 14 Tape reel (Winding reel) CTL control signal track (Position information track)

Claims (1)

[Claims] 1. A data reproducing apparatus which reproduces a position information track, which is wound around a tape reel and is formed in a longitudinal direction of a magnetic tape driven by a capstan, in which position information of the magnetic tape is recorded. The continuity of the reproduction position information obtained by reproducing the position information track of the magnetic tape is judged, and when it is continuous, the reproduction position information is output, and when it is discontinuous, the previously output reproduction is performed. First to correct and output position information
A reproduction position information correction unit, a first clock signal is generated based on the reproduction position information obtained by reproducing the position information track of the magnetic tape, and a second clock signal is generated based on a rotation frequency of the tape reel. A signal is generated, count information corresponding to the number of times of updating the position information is generated based on the first clock signal and the second clock signal, and when the reproduction position information cannot be obtained, the count information is generated. When the second reproduction position information correction unit that corrects and outputs the reproduction position information by using it and the servo circuit that controls the rotation of the capstan are locked, the output signal of the first reproduction position information correction unit is output. And a signal selection unit that selectively outputs and outputs the output signal of the second reproduction position information correction unit when the servo circuit is unlocked. Data reproducing apparatus characterized by comprising a.