JPH03212844A - Rotary controller for rotary head driving motor - Google Patents

Abstract

PURPOSE:To control the rotation of a rotary head driving motor with a stable servo control system by discriminating whether or not an information reproducing system is set in a state capable of obtaining reproducing information data, and performing the driving control of the rotary head driving motor by generating a control voltage corresponding to the above-mentioned state. CONSTITUTION:The rotation control of the rotary head driving motor is performed by reading digital information from a tape on which the digital information is recorded with rotary heads 10, 11. In such a state where appropriate reproducing information data can be obtained from the reading signal of the above reading, the rotation control is performed with a first control voltage formed based on a difference signal representing difference between a rotation detection signal changing corresponding to the frequency of a clock signal CL obtained from a rotary head and reproduced from the reading signal and a reference rotation detection signal. Also, in a state where no appropriate reproducing information data is obtained, the rotation control is performed with a second control voltage repeating a monotone level change in a prescribed range at a prescribed cycle. In such a manner, it is possible to control the rotation of the rotary head driving motor with the stable servo control system.

Description

[Detailed description of the invention] The present invention will be explained in the following order.

A. Field of industrial application B. Overview of the invention C. Prior art D. Problem to be solved by the invention E. Means for solving tJrm F. Effect G. Example G-1 Configuration and operation (Figures 1 to 4) G-2 Modification H Effects of the Invention 8 Industrial Field of Application The present invention provides the following advantages:
The present invention relates to a rotary head drive motor rotation control device included in an information reproducing system that obtains reproduced information data based on a clock signal reproduced from the read signal.

B. Summary of the Invention The present invention reads information from a tape on which digital information is recorded using a rotating head, and reproduces reproduced information data from a read signal obtained from the rotary head based on a clock signal reproduced from the read signal. In a rotary head drive motor rotation control device included in an information reproducing system configured to obtain information, the difference between a rotation detection signal and a reference rotation signal that changes according to the frequency of a clock signal reproduced from a read signal obtained from the rotary head. The information reproduction system determines whether or not it is in a state where proper reproduction information data can be obtained, and when it is in a state where proper reproduction information data can be obtained, a first difference signal representing the difference signal is generated. It also generates a second control voltage that repeats monotonous level changes within a predetermined range at a predetermined period when proper playback information data cannot be obtained. By performing drive control on a rotary head drive motor that rotationally drives a rotary head based on a control voltage, the rotary head drive motor does not have a means for generating a signal having a frequency corresponding to its rotation speed. Therefore, the rotation of the rotary head drive motor can be controlled by a stable servo control system immediately after the information reproducing system starts operating, or even when the information is not being read properly while the information reproducing system is operating. This is what I did.

C. Prior Art In the so-called R-DAT system, which digitizes audio signal information and records it on a recording medium and reproduces it from the recording medium, techniques such as pulse code modulation (PCM) are used. The digitized audio signal information is recorded on a magnetic tape with inclined tracks by a plurality of rotating magnetic heads, and the digitized audio signal information is recorded on a magnetic tape with inclined tracks by a plurality of rotating magnetic heads. The digitized audio signal information is read by the magnetic head section and subjected to reproduction processing.

The information reproducing system in such an R-DAT system is equipped with a signal reading mechanism section, and in the signal reading mechanism section, as shown in FIG. It is attached to a drum 13 rotated by a motor 12 at opposing positions across its rotation shaft. These rotating magnetic heads 10 and 11 have their respective magnetic gaps facing the outer circumferential surface of the drum 13, and when rotated with the rotation of the drum 13, the outer circumferential surface of the drum 13 faces the rotation axis of the drum 13. A magnetic tape Tr on which digitized audio signal information is recorded with a tilted track, which is supposed to slide over an angular range of, for example, about 180 degrees, is rotated alternately along the tilted track. The magnetic tape Tr is scanned to read digitized audio signal information from the magnetic tape Tr, and read output signals Aa and Ab are sent out.

The magnetic tape Tr includes a capstan 15 and a capstan 15 rotated by a cab scan motor 14.
It is caused to travel by a pinch roller 16 which is supposed to come into contact with. The drum motor 12 is a rotary head drive motor that rotationally drives the rotary magnetic heads 10 and 11 attached to the drum 13.
The capstan motor 14 is provided with a drum servo control circuit section 17 for controlling the rotation of the magnetic tape T.
A capstan servo control circuit section 18 is provided to control the rotation of the capstan motor 14 so that the vehicle r travels at a predetermined speed.

Among the controls by the drum servo control circuit section 17 and the capstan servo control circuit section 18, the drum 13 to which the rotating magnetic heads 10 and 11 are attached is controlled by the drum servo control circuit section 17.
Rotation control for the drum motor 12 to rotate the drum motor 12 at a predetermined number of rotations so as to obtain appropriate reading output signals Aa and Ab from the drum motor 12 is generally obtained from a frequency generator provided in the drum motor 12. 1
Furthermore, the rotational phase of the rotating magnetic heads 10 and 11 obtained from a pulse generator provided in association with the drum 13 is determined by the output signal having a frequency corresponding to the rotational speed of the drum 13. The output signals are used to form control signals for the drum motor 12 based on them.

D. Problem to be solved by the invention R is provided with a signal reading mechanism as shown in FIG.
-There is also a strong demand for the information reproducing system in the DAT system to be smaller overall and to simplify the configuration. Therefore, the diameter of the drum to which the rotating magnetic head is attached has been reduced, and the It has been proposed that a frequency generator is not provided, and a pulse generator provided in conjunction with the drum is not provided. In the case of such an information reproducing system that is not equipped with a frequency generator attached to the drum motor and a pulse generator provided in connection with the drum, the drum servo control circuit section controls the drum motor. It has been proposed to perform rotation control using a control signal for a drum motor that is formed based on a read output signal obtained from a rotating magnetic head.

However, in the rotation control of the drum motor by the drum servo control circuit section, which is performed using the control signal for the drum motor formed based on the read output signal obtained from the rotating magnetic head, for example, the information reproduction system Immediately after the start of the reproducing operation in , a state where an appropriate read output signal is not obtained from the rotating magnetic head,
Alternatively, if an appropriate read output signal cannot be obtained from the rotating magnetic head for some reason during the reproducing operation in the information reproducing system, the control signal for the drum motor cannot be obtained properly, and the drum motor If the rotation control of the information reproducing system becomes unstable and the rotation control becomes unstable after the start of the reproducing operation in the information reproducing system but before a stable state is reached where an appropriate read output signal can be obtained from the rotating magnetic head, or once during the reproducing operation in the information reproducing system. There is a problem in that it takes a relatively long time to reach a stable state in which a proper read output signal can be obtained from the rotating magnetic head again after the rotating magnetic head no longer obtains a proper read output signal. .

In view of the above, the present invention uses a rotary head to read information from a tape on which digital information is recorded.
An information reproducing system is provided in which reproduced information data is obtained from a read signal obtained from a rotary head based on a clock signal reproduced from the read signal, and a rotary head drive motor generates a frequency corresponding to the rotation speed of the rotary head. Immediately after the information reproducing system starts operating, or when the information reproducing system is no longer in a proper information reading state while the information reproducing system is operating, in the case where the information reproducing system is not equipped with a signal generating means such as a frequency generator that generates a signal. It is an object of the present invention to provide a rotary head drive motor rotation control device that can control the rotation of a rotary head drive motor using a stable servo control system.

E. Means for Solving the Problems In order to achieve the above-mentioned object, a rotary head drive motor rotation control device according to the present invention uses read signals obtained from a rotary head that reads information from a tape on which digital information is recorded. A rotation detection signal that changes according to the frequency of the reproduced clock signal is obtained, a difference signal representing the difference between the rotation detection signal and the reference rotation signal is obtained, and the above-mentioned clock signal is obtained from the read signal obtained from the rotary head. It is determined whether or not proper playback information data can be obtained based on the information, and as a result, the judgment output obtained from the playback information data determining section is a state in which proper playback information data can be obtained from the read signal obtained from the rotary head. When this is the case, the first control voltage is generated based on the above-mentioned difference signal, and the state is not such that proper reproduction information data can be obtained from the read signal obtained from the reproduction information data discriminator and the discrimination output is obtained from the rotary head. Sometimes, a second control voltage is generated that repeats monotonous level changes within a predetermined range at a predetermined period,
The rotary head drive motor for rotating the rotary head is controlled based on the first or second control voltage.

F Effect According to the rotary head drive motor rotation control device of the present invention configured as described above, rotation control of the rotary head drive motor that rotationally drives the rotary head is performed by the rotary head from a tape on which digital information is recorded. Under conditions where digital information is read and proper reproduction information data can be obtained from the read signal obtained from the rotary head, the rotation changes according to the frequency of the clock signal reproduced from the read signal obtained from the rotary head. This is performed using a first control voltage that is formed based on a difference signal that represents the difference between the detection signal and the reference rotation signal. This is performed using a second control voltage that repeats monotonous level changes at a predetermined period. As a result, under a condition where proper reproduction information data cannot be obtained from the read signal obtained from the rotary head, the rotation of the rotary head is caused to repeat, for example, an upward movement within a predetermined range at a predetermined period. After stable servo control, the rotary head quickly reaches a rotation at which appropriate reproduction information data can be obtained from the read signal obtained from the rotary head.

Therefore, in the case where the rotary head drive motor is not equipped with a signal generation means such as a frequency generator that generates a signal having a frequency corresponding to the rotation speed of the rotary head drive motor, the Even when the information is not being read properly during the operation of the reproduction system, the rotation of the rotary head drive motor is controlled by a stable servo control system, and the time at which the reproduction operation in the information reproduction system starts. Later, a state in which proper reproduction information data can be obtained from the read signal obtained from the rotary head is quickly obtained, or after the reproduction operation in the information reproduction system is no longer in a proper information reading state. In this case, the state is quickly shifted to a state where proper reproduced information data can be obtained from the read signal obtained from the rotary head again.

G Example G-1 Configuration and operation (Figs. 1 to 4) Fig. 1 shows an example of a rotary head drive motor rotation control device according to the present invention, and such an example is shown in Fig. 4. The present invention is applied to an information reproducing system in an R-DAT system equipped with a signal reading mechanism as described above.

In this example, digitized audio signal information is recorded on a magnetic tape Tr with inclined tracks.
The digitized audio signal information is read alternately by the rotating magnetic heads 10 and 11, and the read output signals Aa and Ab obtained from the rotating magnetic heads 10 and 11, respectively, are amplified by the reproducing amplification units 21 and 22. After that, the signals are sequentially taken out via the switch 23 and supplied to the decoder 24 and the PLL clock reproducing section 25, respectively. In the PLL clock reproducing section 25, a phase locked loop (PLL) is used to reproduce a clock pulse signal CL for digitized audio signal information from the read output signals Aa and Ab.

This regenerated clock pulse CL has a frequency of
The rotation of the rotating magnetic heads 1o and 11 depends on the relative speed of the rotating magnetic heads 1o and 11 with respect to the magnetic tape Tr. Therefore, if the running speed of the magnetic tape Tr is maintained appropriately, speed, i.e. drum motor 1
It corresponds to the rotation speed of 2.

The clock pulse signal CL reproduced by the PLL clock reproduction section 25 is supplied to the decoder 24, and the decoder 24 digitizes the read output signals Aa and Ab supplied through the switch 23 based on the clock pulse signal CL. audio signal information Df
is reproduced, and digitized audio signal information Di is sent out from the decoder 24.

The clock pulse signal CL reproduced by the PLL clock reproduction section 25 is also supplied to the F/V conversion data forming section 26, and the F/V conversion data forming section 26 converts the voltage value corresponding to the frequency of the clock pulse signal CL. Frequency-voltage conversion (F/V conversion) is performed to obtain the obtained voltage values, and data that combines the obtained voltage values is formed.
1, and the rotating magnetic head lO
As rotation detection data Dc for and 11, F/V
It is sent out from the conversion data forming section 26. And F/V
The rotation detection data Dc from the conversion data forming section 26 is supplied to the selector 27, and the fixed data Dr representing the predetermined rotational speed of the rotating magnetic heads 10 and 11 from the fixed data supply section 28 is supplied to the selector 27. will also be supplied.

The digitized audio signal information Di sent from the decoder 24 described above is supplied to the reproduction information data discrimination section 29, and the reproduction information data discrimination section 29 determines whether the proper digitized audio signal information Di is received from the decoder 24. It is determined whether or not the information has been obtained, and the reproduction information data determination unit 29 sends determination data DD. For example, this discrimination data DD indicates "1" when proper digitized audio signal information Di is obtained from the decoder 24, and indicates "1" when proper digitized audio signal information Di is obtained from the decoder 24. When the discrimination data DD does not exist, it indicates "0". Then, the discrimination data DD from the reproduction information data discrimination section 29 is supplied to the selector 27, and when the discrimination data DD indicates "'1", The rotation detection data Dc is sent from the F/V conversion data forming section 26, and when the discrimination data DD indicates "0", the fixed data supplying section 2
The fixed data Dr from 8 is sent.

The rotation detection data DC or fixed data Dr sent from the selector 27 is supplied to the PWM modulation section 30, and the PWM
A pulse train signal Pv consisting of constant frequency pulses having a pulse width modulated according to the rotation detection data Dc or fixed data Dr is obtained from the M modulation section 30, and is supplied to a low pass filter (LPF) 31. Ru. As a result, a control voltage Sv having a level change according to a change in pulse width of the pulses forming the pulse train signal Pv is obtained from the LPF 31 and is supplied to the synthesizing section 32.

Further, the rotation detection data Dc obtained from the F/V conversion data forming section 26 is also supplied to one input terminal of the subtracting section 33. The other input terminal of the subtraction unit 33 has the rotating magnetic heads 10 and 1 introduced from the terminal 34.
Reference data Do representing the reference rotational speed for 1 is also supplied. Then, in the subtracting section 33, difference data Dd representing the difference between the rotation detection data Dc obtained from the F/V conversion data forming section 26 and the reference data Do is obtained and supplied to the selector 35. The selector 35 is also supplied with the data "1" introduced from the terminal 36, and is further supplied with the discrimination data DD sent out from the reproduction information data discrimination section 29. ”, the subtractor 3
Sends the difference data Dd from 3, and also sends the discrimination data DD.
When indicates "O", data "1" is sent from the terminal 36.

The difference data Dd or data "1'' sent from the selector 35 is supplied to one input terminal of the addition section 37. The addition output data obtained from the addition section 37 is supplied to the other input terminal of the addition section 37. In the sample/hold unit 38 to which Dx is supplied, the addition output data D
Sample and hold is performed based on the sampling pulse data Ds supplied from the sampling pulse data generation section 39 for x, and as a result, sample and hold output data Dxs obtained from the sample and hold section 38 is supplied. Therefore, in the adder 37, the sample-and-hold output data Dxs from the sample-and-hold unit 38 is added to the difference data Dd or data "1" sent from the selector 35 to form addition output data Dx. become. Then, the adding section 37
When the addition output data Dx falls below the predetermined upper limit value, the addition output data Dx is returned to the lower limit value. Sampling pulse/data generator 3
9, the sampling frequency control signal S from the terminal 40
s is supplied, and the frequency of the sampling pulse at which the sampling pulse data Ds is generated is set based on the sampling frequency control signal Ss.

Sample and hold output data Dxs from the sample and hold section 38 is supplied to a limiter 41. The limiter 41 is also supplied with the playback mode signal Sn from the terminal 42, and the limiter 41 receives the sample-and-hold output data Dxs from the sample-and-hold unit 38, and the playback mode signal Sn is used to detect the normal playback mode in the information playback system. When it is expected that the addition unit 37
A value smaller than the upper limit value of the addition output data Dx from , for example, 3 of the upper limit value of the addition output data Dx
74 and a value greater than the lower limit of the addition output data Dx, for example, the upper limit of the addition output data Dx of 174. When the mode signal Sn indicates that the search reproduction mode is selected in the information reproduction system, the output data Dx s'
Send as. Output data Dx from limiter 41
s' is supplied to the PWM modulator 43, and the PWM modulator 4
3, a pulse train signal Pb consisting of constant frequency pulses having a pulse width modulated according to the output data Dxs' is obtained and supplied to the LPF 44. As a result, a control voltage sb having a level change according to a change in pulse width of the pulses forming the pulse train signal Pb is obtained from the LPF 44 and is supplied to the combining section 32.

The combining unit 32 outputs the control voltages Sv and L from the LPF 31.
A combined output with the control voltage sb from the PF 44 is obtained and supplied to the motor drive unit 45, and the motor drive unit 45 generates a motor drive signal according to both the control voltage Sv from the LPF 31 and the control voltage sb from the LPF 44. Dm is generated, and the motor drive signal Dm is supplied to the drum motor 12 which is a rotary head drive motor, and the control voltage Sv from the LPF 31 to the drum motor 12 and the LPF 4 are
4 and the control voltage sb is performed, and the rotation of the drum motor 12 is controlled by the control voltage Sv and the control voltage s.
b.

Under such circumstances, the information reproduction system is in an inactive state, and as shown in FIG.
Information is reproduced at time t1 under the assumption that the discrimination data DD sent from 9 indicates "0" and that the control voltage Sv from the LPF 31 and the control voltage sb from the LPF 44 are both at zero level. When the operation of the system is started, at time t1, since proper digitized audio signal information Di has not been obtained from the decoder 24, the discrimination data DD is assumed to indicate "0", and therefore the selector 27 sends out the fixed data Dr, and the selector 35 sends out the data "1°".

As a result, after time t1, the control voltage Sv changes according to the fixed data Dr, for example, as shown in FIG. 2B.
It is assumed that a constant level value Vv/2 is taken. On the other hand, in the addition section 37, the sample/hold section 38
Sample and hold output data Dxs and data “
1” is performed sequentially, and the addition output data Dx becomes
A value that increases sequentially from the lower limit value, reaches the upper limit value, then returns to the lower limit value and increases again from the lower limit value is considered to be a value.
The hold output data Dxs is stored in the limiter 41,
When the normal reproduction mode is adopted in the information reproduction system, the addition output data Dx is limited to a value between the upper limit value of 374 and the upper limit value of 174, and the information reproduction When the search reproduction mode is adopted in the system, the output data Dx s' is supplied to the PWM modulation section 43 without adding any additional restrictions.

As a result, the control voltage sb becomes as shown by the solid line in FIG. 2C when the normal reproduction mode is returned to in the information reproduction system according to the output data Dxs.
Level value Vb/4 to level value 3 at a predetermined period
It has a level that repeats a monotonous increase up to Vb/4, and when the search reproduction mode is used in the information reproduction system, it reaches the zero level at a predetermined period as shown by the broken line in Figure 2C. It has a level that repeats a monotonous increase from to level value vb. Therefore, the drum motor 12 is controlled by the control voltage S
The rotation speed is controlled by V and the control voltage sb to maintain a stable rotation control state, and the rotation speed thereof repeatedly increases within a predetermined range in response to changes in the level of the control voltage sb.

In this situation, at time t2 after time t1,
A state is obtained in which proper digitized audio signal information Di is obtained from the decoder 24, and accordingly,
As shown in FIG. 2A, the discrimination data DD is determined at time t2.
After time t2, the selector 27 sends out the rotation detection data Dc, and the selector 35 sends out the difference data Dd. As a result, as shown in FIG. 2B, the control voltage Sv has a level that slightly fluctuates around the level value Vv/2 after time t2, and the difference data Dd has a value that fluctuates in positive and negative directions. Therefore, the sample-and-hold output data Dxs is assumed to have a value that fluctuates around the value that was present immediately before time t2, and as a result, the control voltage sb is As shown in FIG. C, after time t2, the level fluctuates slightly around the level value Vb/2, for example.

Then, the drum motor 12 is placed in a stable rotation control state based on the control voltage SV and control voltage sb.

Further, the information reproduction system is in an operating state, the normal reproduction mode is taken, and proper digitized audio signal information Di is obtained from the decoder 24, and the third
As shown in FIGS. A, B, and C, the discrimination data DD sent from the reproduction information data discrimination section 29 indicates "1", and the control voltage Sv from the LPF 31 and the LPF 44
Under the assumption that the control voltage sb from the decoder 24 has a level that slightly fluctuates around the level value Vv/2 and a level that slightly fluctuates around the level value Vb/2, at time t3, suddenly the control voltage sb from the decoder 24 When proper digitized audio signal information Di is no longer obtained, the discrimination data DD changes to indicate "0" at time t3, as shown in FIG. 3A, and accordingly, the selector 27 It is assumed that the selector 35 sends out the fixed data Dr, and the selector 35 sends out the data "°1'".

As a result, after time t3, the control voltage Sv changes according to the fixed data Dr, for example, as shown in FIG. 3B.
It is assumed that a constant level value Vv/2 is taken. On the other hand, in the addition section 37, the sample/hold section 38
Sample and hold output data Dxs and data “
1” is performed sequentially, and the addition output data Dx becomes
A sample is obtained based on a value that increases sequentially from the value that was detected immediately before time t3, reaches an upper limit value, then returns to the lower limit value and repeats increasing from the lower limit value again.・Hold output data Dx
s is limited in the limiter 41 to a value between the upper limit value of 374 and the upper limit value of 174, so that the output data Dx s
' and is supplied to the PWM modulator 43. As a result, the control voltage sb is adjusted to the third level according to the output data Dxs'.
As shown in Figure C, the level value V
It has a level that repeats a monotonous increase from b/4 to level value 3 V b/4. Therefore, the drum motor 12 is controlled by the control voltage Sv and the control voltage Sb to be in a stable rotational control state, and its rotational speed is controlled within a predetermined range according to the level change of the control voltage sb. It is assumed that the increase will be repeated.

Then, at time t4 after time t3, the decoder 2
4 to the appropriate digitized audio signal information D
When the state in which i can be obtained is restored, the discrimination data DD changes to indicate "°l" at time t4, as shown in FIG. 3A, and after time t4, the selector 27 detects rotation. It is assumed that the selector 35 sends out the data Dc, and the selector 35 sends out the difference data Dd. Thereby, the control voltage Sv changes at time t, as shown in FIG. 3B.
From 4 onwards, the level value ■v/2 is assumed to be the center and the level fluctuates slightly, and the difference data Dd is assumed to have a value that fluctuates in positive and negative directions, so the sample-and-hold output data Dxs is It is assumed that a value that fluctuates around the value that was present immediately before time t4 is generated, and as a result, the control voltage sb becomes as shown in FIG.
After time t4, the level fluctuates slightly around the level value Vb/2, for example. Then, the drum motor 12 receives the control voltage Sv and the control voltage sb.
Based on this, a stable rotational control state is achieved.

G-2 Modification The above example is applied to a reproduction system in an R-DAT system equipped with a signal reading mechanism as shown in FIG. The rotary head drive motor rotation control device is not limited to application to such playback systems, but is widely used to read information from a tape on which digital information is recorded using a rotary head, and to read information from a read signal obtained from the rotary head. , various modifications to the above-described example can be constructed to be applied to an information reproducing system that obtains reproduced information data based on a clock signal reproduced from the read signal.

H Effects of the Invention As is clear from the above explanation, according to the rotary head drive motor rotation control device according to the present invention, information is read from a tape on which digital information is recorded using the rotary head, and the reading obtained by the rotary head is The rotary head drive motor rotates according to the rotation speed of the rotary head drive motor provided in the information reproducing system, which obtains reproduced information data based on the clock signal reproduced from the read signal. If the information reproducing system is not equipped with a signal generating means such as a frequency generator that generates a signal with a frequency, and the information reproducing system loses its proper information reading state immediately after starting operation or while the information reproducing system is operating. This enables control to be performed under a stable servo control system even in situations such as when In addition, the reproducing operation in the information reproducing system is able to quickly obtain the correct reproduction information from the read signal obtained from the rotary head after the reproduction operation is no longer in the proper information reading state. This means that the state from which data will be obtained can be quickly obtained.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an example of a rotary head drive motor rotation control device according to the present invention, FIGS. 2A-C and 3
Figures A to C are waveform diagrams used to explain the operation of the example shown in Figure 1, and Figure 4 is a schematic configuration diagram showing a signal reading mechanism section provided in the reproduction system in the R-DAT system. In the figure, 0 and If are rotating magnetic heads, 12 is a drum motor, 24 is a decoder, 25 is a PLL clock regeneration unit,
26 is an F/V conversion data forming section, 27 and 35 are selectors, 29 is a reproduction information data determining section, 31 is an LPF, 33
37 is a subtraction section, 37 is an addition section, 38 is a sample/hold section, 41 is a limiter, and 45 is a motor drive section. Figure 3

Claims (1)

[Scope of Claims] A rotation detection unit that obtains a rotation detection signal that changes according to the frequency of a clock signal reproduced from a read signal obtained from a rotary head that reads information from a tape on which digital information is recorded; a difference signal forming section that obtains a difference signal representing the difference between the rotation detection signal obtained from the rotation detection section and the reference rotation signal; and a difference signal forming section that obtains a difference signal representing the difference between the rotation detection signal obtained from the rotation detection section and the reference rotation signal, and obtaining appropriate reproduction information data based on the clock signal from the read signal obtained from the rotation head. a reproduced information data discriminating section that determines whether or not the state is in a state in which the reproduction information is in a state where the reproduction information data is in a state in which a discriminating output is generated, and the discriminating output obtained from the reproduced information data discriminating section is used to obtain appropriate reproduced information data from a read signal obtained from the rotary head. When the output signal indicates the state, a first control voltage is generated based on the difference signal obtained from the difference signal forming section, and the discrimination output is determined as appropriate reproduction information data from the read signal obtained from the rotary head. a control signal forming section that generates a second control voltage that repeats monotonous level changes within a predetermined range at a predetermined period when the control voltage is not obtained; A rotary head drive motor rotation control device comprising: a motor drive section that performs drive control on a rotary head drive motor that rotationally drives the rotary head based on a first or second control voltage.