JPH0719435B2 - Recording or playback device - Google Patents

Description

Description: TECHNICAL FIELD The invention of this application relates to a recording or reproducing apparatus for recording a video signal on a record carrier such as a magnetic disk or reproducing the recorded signal, and particularly to disturbance or the like. The present invention relates to a means for controlling the rotation of the record carrier with good responsiveness and synchronization accuracy even when a large phase variation factor occurs, or when the recording or reproducing head is moved.

(Prior Art) In a recording or reproducing apparatus of the type described above, for example, a record carrier driving motor of an electronic still camera, the drive control of the motor is performed so as to match the rotation phase of the motor with a reference signal for controlling the operation timing of the entire camera. Was going on. That is, the phase control is performed by using a phase difference between a rotation phase signal having a cycle equal to the rotation cycle of the motor (generated once for each rotation of the motor) and a reference signal, for example, a vertical synchronization signal as a deviation signal.

(Problems to be Solved by the Invention) By the way, in the control method in which the rotational phase of the record carrier driving motor is adjusted with respect to the reference signal, it takes a considerable time from starting the motor to phase synchronization. Moreover, since the deviation signal is obtained only once for one rotation of the motor, the control response is poor and the phase synchronization accuracy is low.

In order to solve the above-mentioned problems, the present applicant has previously made a recording or reproducing head, a rotation driving means for relatively rotating the recording or reproducing head and a record carrier, and a rotation speed of the rotation driving means. Is started at a predetermined rotation phase of the rotation / rotation driving means in accordance with a predetermined speed, and a reference signal generating means for forming a cycle-appropriate reference signal; and the rotation driving means based on the output of the reference signal generating means. A recording device that includes a phase control unit that controls a rotation phase and a synchronization signal generation unit that generates a synchronization signal for processing a video signal that is in synchronization with the rotation phase of the rotation drive unit based on the phase control by the phase control unit. We proposed a playback device (Japanese Patent Application No. 60-53144).

The invention of this application further improves the above-mentioned proposal so that the phase can be effectively controlled even when a large phase fluctuation occurs due to disturbance or the like, or when the recording or reproducing head is moved. Is what you are trying to do.

Therefore, the first invention of this application is a record carrier for recording or reproducing a video signal on a record carrier or reproducing the recorded signal even when a large phase variation factor such as disturbance occurs. To provide a means capable of controlling the rotation of the recording medium with good responsiveness and synchronization accuracy and reducing variations in the starting time of the means for relatively rotating the recording or reproducing head and the record carrier.
It is therefore an object of the present invention to provide a recording or reproducing device suitable for quick shooting.

It is another object of the present invention to provide a recording or reproducing device that has the same function as that of the first invention when the recording or reproducing head is moved.

(Means for Solving Problems) In order to achieve the above-mentioned object, the recording or reproducing apparatus of the first invention of the present application is a recording or reproducing head, and a relative position of the recording or reproducing head and the record carrier. Rotation drive means for rotating the rotation drive means, pulse generation means for generating a pulse signal in accordance with the rotation operation of the rotation drive means, and a cycle of the pulse signal output from the pulse generation means, and based on the detection result. Speed control means for controlling the rotation speed of the rotation drive means to be a predetermined speed; and the speed control means, which is activated when the rotation speed of the rotation drive means reaches the predetermined speed, and is controlled by the pulse generation means. A reference signal generating means for generating a periodic reference pulse signal having a predetermined phase difference with respect to the output pulse signal, and the speed control means for controlling the rotation driving means. The operation is started when the rotation speed reaches the predetermined speed, and the phase difference between the reference pulse signal output from the reference signal generating means and the pulse signal output from the pulse generating means becomes a predetermined value. As described above, the phase control means for controlling the rotation phase of the rotation driving means, and when the variation amount of the phase difference exceeds a predetermined set limit, the phase control operation by the phase control means changes the speed by the speed control means. Switching to a control operation, controlling the rotation speed of the rotation driving means to the predetermined speed, and then generating the reference pulse signal from the reference signal generating means in accordance with the pulse signal output from the pulse generating means. Control means for reforming the reference pulse signal, and a synchronization signal for video signal processing for synchronizing with the rotation phase based on the phase control by the phase control means. A synchronization signal generating means for generating, in which and a reproduction control unit to control the recording or reproducing operation on the basis of the synchronizing signal output from said synchronizing signal generating means.

The recording or reproducing apparatus according to the second aspect of the invention includes a recording or reproducing head, a rotation driving unit that relatively rotates the recording or reproducing head and the record carrier, and a pulse signal according to the rotation operation of the rotation driving unit. Pulse generating means for generating
Speed control means for detecting the period of the pulse signal output from the pulse generation means, and controlling the rotation speed of the rotation drive means to be a predetermined speed based on the detection result;
The speed control means activates when the rotation speed of the rotation drive means reaches the predetermined speed, and the periodic reference pulse signal has a predetermined phase difference with respect to the pulse signal output from the pulse generation means. The reference pulse signal output from the reference signal generating means, which starts operation when the rotation speed of the rotation driving means reaches the predetermined speed by the reference signal generating means and the speed control means. In response to a command to move the recording or reproduction head, a phase control unit that controls the rotation phase of the rotation drive unit so that the phase difference with the pulse signal output from the pulse generation unit becomes a predetermined value. After the phase control operation by the phase control means is switched to the speed control operation by the speed control means, and the rotation speed of the rotation drive means is controlled to the predetermined speed. Based on the phase control by the control means for reforming the reference pulse signal by generating the reference pulse signal according to the pulse signal output from the pulse generation means from the reference signal generation means, and the phase control means. A sync signal generating means for generating a sync signal for video signal processing synchronized with the rotation phase, and a recording / reproducing control means for controlling a recording or reproducing operation based on the sync signal output from the synchronizing signal generating means. Be prepared. In the second aspect of the invention, the movement of the recording or reproducing head means the track feeding operation of the head, or
When the recording or reproducing operation is temporarily stopped, the head is separated from the record carrier surface.

(Operation) The first invention of this application is based on the above configuration, in which the speed of the rotary driving means for relatively rotating the recording or reproducing head and the record carrier is stabilized, and then the rotational driving is performed by the phase control means. Means for controlling the rotation phase of the video signal, and based on the phase control by the phase control means, forms a sync signal for video signal processing which is in synchronism with the rotation phase of the rotary drive means, and quickly drives the video signal synchronizing means and the rotary drive. To obtain phase synchronization with the means. Further, the periodic reference signal is re-formed in response to the occurrence of the phase fluctuation exceeding the setting limit, whereby the rotation of the record carrier can be made to have good responsiveness and good responsiveness even when a phase fluctuation factor with a large disturbance occurs. Control with synchronization accuracy.

In addition, the second invention exhibits the operation described in the preceding paragraph among the matters described as the operation of the first invention, and
The rotation of the record carrier does not necessarily need to detect the phase fluctuation even when the recording or reproducing head is moved so that the periodic reference signal is set or reformed with the movement of the recording or reproducing head. Control with good responsiveness and synchronization accuracy.

(Embodiment) An embodiment of the recording or reproducing apparatus of the invention of this application will be described in detail below with reference to the drawings. In the following description, regarding the example in which the invention of this application is applied to an electronic still camera of a magnetic recording or reproducing system using a magnetic disk as a record carrier, the configuration of the embodiment of the first invention of this application, its action, etc. And the order of the embodiment of the second invention. The invention of this application is, for example, another recording or reproducing system such as an optical system using a laser beam or the like, or a capacitance system,
Alternatively, it can be applied to a system using another record carrier such as a tape.

(Structure of Embodiment of First Invention of this Application) (FIG. 1) FIG. 1 shows an embodiment in which the first invention of this application is applied to an electronic still camera, in which 1 is a motor start-up. A switch, 2 is a system controller for controlling the motor drive and the entire synchronizing signal generation system, and includes a central processing unit (CPU),
Includes Random Access Memory (RAM), Read Only Memory (ROM) and Counter, of which R
The OM stores the processing procedure shown in FIG. 2 described later. 3 is a counter circuit that resets at a rising edge of an input signal from a control reference signal generation circuit 6 or an FG signal generator 10 described later and starts counting high frequency pulses from a pulse generator (not shown), and 4 is an FG signal. It is a latch circuit that holds the contents of the counter circuit 3 at each rising edge of the input signal from the generator 10. The phase control means is constituted by 2 to 4.

Reference numeral 5 is a sync signal generation circuit for generating the sync signal for the video signal processing of the recording or reproduction system, and 6 is a control reference signal generation circuit for generating a periodic reference signal for controlling the phase of the motor drive system. Is. Reference numeral 7 is a D / A converter that converts a motor control digital signal output from the system control unit 2 into an analog signal, and 8 is a motor that amplifies the output of the D / A converter 7 and drives and controls the motor 9 accordingly. A drive circuit, 9 is a motor for driving a magnetic disk 25 as a record carrier. Reference numeral 10 denotes an FG signal generator that generates an FG signal having a cycle proportional to the rotation cycle of the motor 9. As the FG signal, for example, 16 pulses are generated for each rotation of the motor 9. Reference numeral 11 denotes a mode changeover switch that switches in response to a mode changeover signal from the system control unit 2, and when it is changed over to the side a (speed control mode), the FG signal from the FG signal generator 10 is used as a reset signal for the counter. It is supplied to the circuit 3 and, when switched to the b side (phase synchronization mode), the periodic reference signal from the control reference signal generation circuit 6 is supplied to the counter circuit 3 as a reset signal. A PG signal generator 12 outputs a PG pulse synchronized with the rotation phase of the motor 9 at a high level once for each rotation of the motor 9.

Reference numeral 20 denotes a one-shot circuit, which is longer than one cycle of the periodic reference signal generated by the control reference signal generation circuit 6 when the ready signal from the system control unit 2 switches from low level to high level, and A high-level one-shot pulse having a width shorter than the two cycles is generated. Reference numeral 21 denotes an AND gate, which outputs the high-level pulse from the one-shot circuit 20 from the PG signal generator 12.
Each PG pulse is input, and its output signal is supplied to the synchronization signal generation circuit 5 to synchronously control the circuit 5. Reference numeral 22 is an image pickup device driven by the synchronization signal, 23 is a signal processing circuit which is controlled by the synchronization signal, processes an output signal of the image pickup device 22, and converts the output signal into a video signal suitable for recording.
Is a magnetic head as a recording or reproducing head, and 25 is a magnetic disk as a record carrier. Note that the synchronization signal is used for video signal processing such as adding a blanking pulse to a video signal read by the imaging device, in addition to performing synchronous control of the imaging device 22 and the signal processing circuit 23, When it is applied to a reproducing apparatus, it is used for clamping a video signal or separating an ID signal superimposed on the video signal. Therefore, in this specification, the sync signal for video signal processing broadly includes the sync signal for video signal processing in the recording or reproducing apparatus including these video signal processing.

A step motor drive circuit 30 drives and controls the step motor 31 in accordance with a step motor control signal output from the system controller 2. Reference numeral 32 denotes a head drive device, which converts the rotational movement of the step motor 31 into a linear movement in the radial direction of the magnetic disk 25, as is well known, and thereby the head of the magnetic head 24 supported by a head moving base (not shown). Sending is done.

(Operation and modification of the embodiment of the recording or reproducing apparatus of the first invention of this application) (FIGS. 1 to 4) Next, referring to the flowchart of FIG. 2, the embodiment of FIG. The action of will be described. Here, the rotation of the motor 9 and the vertical synchronizing signal are synchronized, the FG signal and the period of the periodic reference signal from the control reference signal generating circuit 6 are equal at the time of phase synchronization, and one period of the FG signal pulse is 2π. Then, the phase difference between the rising edge of the FG signal pulse and the rising edge of the reference signal is controlled to be π. the first,
It is assumed that the motor 9 is stopped and the switch 11 is switched to the a side to enter the speed control mode. Step S1
When the switch 1 is turned on (the letters "step" will be omitted in the display of steps below and the step number is described after the initial letter S), the system control unit 2 causes the D / A converter 7 to drive the motor 9 The motor drive circuit 8 receives the output of the D / A converter 7 by applying the starting torque required to start the motor and outputting a constant value signal for rotating the motor at a required speed, for example, 60 Hz. To rotate the motor 9 (S2).

Subsequently, in S3 and S4, it is detected in the following manner whether or not the speed of the motor 9 is stable, and the speed is controlled. That is, the FG pulse signal proportional to the rotation cycle of the motor 9 is output from the FG signal generator 10 by the rotation of the motor 9, and this FG pulse signal is input to the latch circuit 4 and the contents of the counter circuit 3 are input at the rising edge thereof. Retained. On the other hand, the FG pulse signal is input to the counter circuit 3 as a reset signal, whereby the circuit 3 is reset at the rising edge of the FG pulse signal, and the counting of the high frequency pulses is restarted from zero. That is, the timer counter is
After resetting at the rising edge of the pulse signal, the time (cycle) until the FG pulse signal is supplied again is counted, and it is latched at each input of the FG pulse signal.

Therefore, the latch circuit 4 changes the cycle of the FG pulse signal to
A signal representing the number of the high frequency pulses is held for each rising edge of the FG pulse signal.

The system control unit 2 calculates a manipulated variable with the difference between the period of the held FG pulse signal and the control target period as the deviation amount, and outputs the calculation result to the D / A converter 7. The above control target period is, for example, the vertical synchronization signal period for the NTSC system.
The number of FG pulses per 1/60 × 1/1 rotation with respect to 1/60 seconds, that is, 1/60 × 1/16 in the above example. Whether or not the speed of the motor 9 is stable is detected by the system controller 2 based on the deviation amount (S4). That is, if the deviation amount is within a predetermined range around the target speed, it is determined that the speed of the motor 9 is stable, and the process proceeds to the next step S5. If it exceeds the predetermined range, the speed of the motor 9 is decreased. Return to S3 as unstable and repeat the above process.

Next, the system controller 2 detects the rising edge of the FG pulse signal directly input to the controller (S5), the built-in counter starts time counting from the rising edge of the signal (S6), and the synchronization is performed. If the period of the FG pulse at that time is T, and one period thereof is 2π, it is detected whether or not the time from the start of counting has elapsed for a time corresponding to T / 2 = π (S7), and the above time is detected. If has passed, the system control unit 2 switches the switch 11 to the b side (phase control mode) by the output signal (S8). Next, the system control unit 2 sends a reference signal generation timing signal to the control reference signal generation circuit 6, and at the time when π time has elapsed from the rise of the FG pulse in the system control unit 2, the generation circuit 6 outputs the periodic reference signal. It will be started (S9).
That is, as shown in FIG. 3, the periodic reference signal is set at a half cycle (T / 2 = π) from the rise of the FG signal or at a difference.

As a result, the counter circuit 3 is reset at the rising of the periodic reference signal output from the control reference signal generation circuit 6 this time. Then, the system control unit 2 reads the contents held in the latch circuit 4 (S10),
Here, the count value of the counter circuit 3 is reset at each rising edge of the periodic reference signal.
The count value of is latched by the latch circuit 4 every time the FG signal pulse is generated. Therefore, the content is the count value of the counter path 3 until the rising of the periodic reference signal and the rising of the FG pulse signal. Periodic reference signal and FG
It shows the phase difference from the pulse signal. Next, in S11, the system control unit 2 calculates the deviation amount between the target phase difference value and the phase difference between the rising edge of the periodic reference signal and the rising edge of the FG pulse signal based on the content held in the latch circuit 4. , S12, this calculation result is used as the manipulated variable D
Output to / A converter 7. As a result, the motor drive circuit 8
The rotation phase of the motor 9 is controlled via the.

Further, in S13, whether the phase difference between the periodic reference signal and the FG pulse signal read from the contents held in the latch circuit 4 by the system control unit 2 is the target phase difference,
That is, it is detected whether or not the phase is synchronized, and if the phase synchronization is obtained, the system control unit 2 transfers a high-level ready signal to the one-shot circuit 20 in S14, and the control step itself returns to S10. Prepare to read the latch contents in the cycle. The one-shot circuit 20 receives the high-level ready signal and outputs a pulse longer than one cycle and shorter than two cycles of the periodic reference signal to the AND gate 21. The PG signal from the PG signal generation circuit 12 is also input to the AND gate 21, but this PG signal is
The high level of the both signals causes the output of the AND gate 21 to become the high level once per one rotation of the motor 9, and the high level signal synchronously controls the synchronization signal generating circuit 5. .

In this way, the synchronization signal generated from the synchronization signal generation circuit 5 performs the synchronization control for the video signal processing including the synchronization control of the drive timing of the image pickup device 22 and the timing of the signal processing circuit 23 and the like. Since the phase control in this device is performed based on the FG pulse that generates 16 pulses for one rotation of the disk drive motor 9, for example, the phase control is increased as compared with the control by the PG pulse that generates only one pulse for one rotation of the motor. It is possible to achieve fast and highly accurate phase synchronization. Further, the disk drive motor 9 is first synchronously controlled by the phase control means, and the synchronous signal generating circuit 5 is synchronously controlled based on the rotation phase of the motor, so that the disk drive motor 9 is based on the reference synchronous signal.
The responsiveness and accuracy of control are higher than those that perform the phase control.

Returning to S13, if the phase synchronization is not obtained, the system control unit 2 turns off the ready signal or sets it to the low level (S15), and detects in S16 whether the phase fluctuation width exceeds the predetermined limit. If it is within the predetermined limit, the process returns to S10 and the processes after the reading of the contents held in the latch circuit 4 are repeated. On the contrary, if the phase fluctuation width exceeds the predetermined limit, the routine returns to S3 and the routine starting from the speed control operation by the FG pulse is repeated in order to reform the periodic reference signal. This is because the control becomes unstable if the phase fluctuation width exceeds a predetermined limit, and in the control state as it is, it takes a considerable time to reach the accuracy required for recording or reproduction again. This is because the stable state can be recovered faster by returning to the speed control operation that stabilizes relatively quickly and reforming.

In the above-described embodiment, the target phase difference is set so that the phase difference between the periodic reference signal and the FG pulse signal becomes π, but when switching to the phase control mode, it becomes π by counting from the rising edge of the FG pulse. Even if the periodic reference signal is set at the timing, the actual initial phase difference may not be π due to the influence of load fluctuation during one pulse period of the FG pulse signal. Therefore, after that, the phase difference must be further returned to π. Therefore, the first phase difference after the setting of the periodic reference signal in S9 may be set as the phase control target in S11 and thereafter, and control may be performed so as to maintain the phase difference, which can shorten the time required for phase synchronization.

However, the setting of the above target phase difference is not arbitrary and should be set at least near π for the reason described later. That is, if the initial phase difference is significantly different from π, that is, 0 or 2π, the phase control target must be π and the phase difference must be returned to π. This means that when the target phase difference is around 0 or 2π, for example, around 15 / 8π as shown in Fig. 4, when the phase of the FG pulse is further delayed by 1 / 8π or more from the phase of the periodic reference signal, The phase difference becomes 1 cycle, that is, 2π or more, and the phase shift of exactly 1 cycle seems to be in phase and is not detected as a phase difference. Therefore, the latch content in the system control unit 2 at that time is 1 / 8π or less. This is because the system control unit 2 is mistakenly assumed to have advanced from 15 / 8π to 1 / 8π or less, even though it is actually further delayed from 15 / 8π by 1 / 8π or more, and the control thereafter becomes difficult. . Therefore, the target phase difference setting range should be set to a range in which the phase difference does not become 0 or less or 2π or more even if there is a load change, that is, π as described above, or at least set near π. .

Although the phase control is performed by the FG pulse signal in the above-described embodiment, the phase control can be similarly performed by the PG pulse signal. However, since the FG pulse signal has a shorter cycle, using the FG pulse signal enables higher-speed and higher-precision control.

In the above-described embodiment, the disk 25 is used as a record carrier, and the head 24 is stationary with respect to the recording track and the disk 25 is rotated at the time of recording or reproducing. However, the invention of this application is like a video tape recorder. The present invention can also be applied to an embodiment in which the record carrier and the recording or reproducing head rotate together, and further, the Japanese Patent Application Laid-Open No. 59-5168 filed by the present applicant.
It can also be applied to an embodiment in which a tape is stopped and only a head is rotated to reproduce a still image as described in the specification of Japanese Patent Application No. 57-161645.

(Embodiment of the second invention of this application) (FIGS. 1 and 2) The second invention of this application is to move a recording or reproducing head,
That is, a head feeding operation, or an operation of separating the head from the surface of the record carrier when recording or reproduction is temporarily stopped (for example, by a means of rotating a cassette holder in which a cassette for storing a magnetic disk is mounted upward, etc.), or The operation command is detected to set or recreate the periodic reference signal. That is, when the operator dials a new track number to move the recording or reproducing head to a new track, or when the track is automatically fed, the system control unit 2 in FIG. A track feed command is detected and a head feed signal is output to the step motor drive circuit 30, which causes the step motor 31 to pass the magnetic head 24 through the head drive device 32.
Is moved to a predetermined track.

The system control unit 2 uses the track feed command described above, or
A routine for setting (reforming) the control system shown in FIG. 1 (including the case of re-forming, the same applies hereinafter) in response to an operation or an instruction to move the magnetic head 24 away from the surface of the magnetic disk 25. Move to. Explaining in which step in FIG. 2 the transition to the routine for setting the periodic reference signal is performed. For example, in S16, instead of detecting that the phase fluctuation width exceeds a predetermined limit, recording or reproduction is performed. Although it may be possible to detect that the head 24 is in the middle of track feeding and return to S3, when the head feeding is performed when the motor 9 is started, the periodic reference signal may be set first. The conditions may be that the head feed is completed and the speed is stable. That is, S3 in FIG.
Then, the periodic reference signal is set. Generally, at any step in FIG. 2 (for example, in any case where phase fluctuation is expected due to movement of the head)
Although it is possible to return to the routine for setting the periodic reference signal, it is possible to perform the routine (S3 to S7) after the motor 9 is started and its speed is stabilized and before the speed control mode is switched to the phase synchronization mode. The reason is that in order to detect the head feed and set the periodic reference signal, the reference signal can be set more quickly if it is performed at the above time.

If the recording or playback head is track-fed, normally,
Although a large phase fluctuation is involved due to the load fluctuation, the second invention is characterized in that it is not necessary to detect the phase fluctuation width, and therefore the process shifts to the periodic reference signal setting routine only depending on the head movement condition. Is.

Also in the second invention, by generating the synchronizing signal for processing the video signal which is synchronized with the rotation phase of the rotation driving means based on the phase control by the phase controlling means described in FIG. The effect of the first aspect of the present invention is that the synchronizing means and the rotation driving means can be quickly synchronized in phase, and the same modifications as described for the first aspect are possible.

(Effects of the Invention) As described above, according to the first invention of this application, the synchronization signal for video signal processing that is synchronized with the rotation phase of the rotation drive means is formed based on the phase control by the phase control means. It is possible to obtain the phase synchronization between the video signal synchronizing means and the rotation driving means more quickly than the conventional one that performs the synchronization control of the rotation driving means based on the synchronization signal included in the video signal. Further, since the periodic reference signal is re-formed in response to the occurrence of the phase fluctuation exceeding the set limit, even when a large phase fluctuation factor such as disturbance occurs, the rotation driving means, and thus the driving by this Since it is possible to control the rotation of the recorded carrier with good responsiveness and synchronization accuracy, it is possible to reduce variations in the startup time of the rotation driving means, and to obtain a recording or reproducing apparatus suitable even for quick shooting. it can.

Further, in the second invention, the periodic reference signal is set or reformed in accordance with the movement of the recording or inventing head. Therefore, it is necessary to detect the phase fluctuation when the recording or reproducing head is moved. Without doing so, it is possible to obtain a recording or reproducing device that achieves the same effects as the first invention.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the recording or reproducing apparatus of the invention of this application, FIG. 2 is a flow chart for explaining the operation of the embodiment of FIG. 1, and FIGS. 3 and 4 are respectively FIG. 6 is an explanatory diagram of a timing relationship between an FG pulse signal and a periodic reference signal in the embodiment of FIG. Explanation of code 2: System control part, 3: Counter circuit, 4: Latch circuit, 5:
Synchronous signal generation circuit, 6: Control reference signal generation circuit, 9: Motor as rotation driving means, 10: FG signal generator, 11: Switch, 12: PG signal generator, 24: Magnetic head as recording or reproducing head , 25: magnetic disk as record carrier, 30: step motor drive circuit, 31: step motor, 32: head drive device.

Claims (2)

[Claims] 1. A recording or reproducing head, a rotation driving means for relatively rotating the recording or reproducing head and a record carrier, and a pulse generating means for generating a pulse signal according to a rotating operation of the rotation driving means. A speed control means for detecting a cycle of a pulse signal output from the pulse generation means and controlling the rotation speed of the rotation drive means to be a predetermined speed based on the detection result; and the speed control means, Reference signal generation that is started when the rotation speed of the rotation drive means reaches the predetermined speed and that generates a periodic reference pulse signal having a predetermined phase difference with respect to the pulse signal output from the pulse generation means. Means and the speed control means, start operation when the rotation speed of the rotation driving means reaches the predetermined speed, and output from the reference signal generating means. Phase control means for controlling the rotation phase of the rotation driving means so that the phase difference between the reference pulse signal and the pulse signal output from the pulse generating means has a predetermined value, and the variation amount of the phase difference is predetermined. When the setting limit of is exceeded, the phase control operation by the phase control means is switched to the speed control operation by the speed control means, the rotation speed of the rotation drive means is controlled to the predetermined speed, and then the reference signal is applied. Control means for reforming the reference pulse signal by generating the reference pulse signal according to the pulse signal output from the pulse generating means from the generating means, and the rotation based on the phase control by the phase controlling means. A sync signal generating means for generating a sync signal for video signal processing which is synchronized with the phase, and based on the sync signal output from the sync signal generating means And a recording / reproducing apparatus for controlling recording / reproducing operation. 2. A recording or reproducing head, a rotation driving means for relatively rotating the recording or reproducing head and a record carrier, and a pulse generating means for generating a pulse signal according to a rotating operation of the rotation driving means. A speed control means for detecting a cycle of a pulse signal output from the pulse generation means and controlling the rotation speed of the rotation drive means to be a predetermined speed based on the detection result; and the speed control means, Reference signal generation that is started when the rotation speed of the rotation drive means reaches the predetermined speed and that generates a periodic reference pulse signal having a predetermined phase difference with respect to the pulse signal output from the pulse generation means. Means and the speed control means, start operation when the rotation speed of the rotation drive means reaches the predetermined speed, and output from the reference signal generation means. The phase control means for controlling the rotation phase of the rotation drive means so that the phase difference between the reference pulse signal and the pulse signal output from the pulse generation means becomes a predetermined value, and the movement of the recording or reproduction head. In response to a command, the phase control operation by the phase control means is switched to the speed control operation by the speed control means, the rotation speed of the rotation drive means is controlled to the predetermined speed, and then the pulse is generated by the reference signal generation means. An image synchronized with the rotation phase based on the phase control by the control unit, which regenerates the reference pulse signal by generating the reference pulse signal according to the pulse signal output from the generation unit, and the phase control by the phase control unit. Sync signal generating means for generating a sync signal for signal processing, and recording or recording based on the sync signal output from the sync signal generating means A recording or reproducing device comprising a recording / reproducing control means for controlling a reproducing operation.