KR0136457B1 - Dvcr high speed reproducing method - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a double speed playback method of DVCR (DVCR), and more particularly to a double speed playback of a DVCR that plays back an I-frame at a high speed without changing the arrangement of data recorded on a tape. It is about a method.

Therefore, in the present invention, the end point search step (1, 2) of the I-frame that finds the end of the I-frame (Intra-Frame) while performing a normal playback function, the acceleration and deceleration of the driving speed of the capstan motor for a predetermined time skip Is performed by a skip step (3, 4, 5) and an I-frame playback step (6) for playing back an I-frame by performing a normal playback function, by controlling the speed of the capstan motor in time during double speed playback of the DVCR. There is an effect that the double speed reproduction of the DVCR can be performed regardless of the arrangement of the video signals recorded on the tape.

Description

How to play double speed of DVR

1 is an exemplary view showing a head trajectory in the conventional double speed reproduction

2 (a), (b) and (c) are structural diagrams of a compressed bit stream and a recording track of a general video signal.

3 is an overall flowchart of a double speed reproduction method according to the present invention.

4 (a) and (b) are state diagrams of the double speed regeneration method according to the driving speed of the capstan motor.

5 is a structural diagram of a tension control system showing a driving relationship between a capstan motor and a supply reel

6 is a block diagram for obtaining the characteristics of the tension control system of FIG.

7 is a structural diagram of a tension control system showing a driving relationship between a capstan and a take-up reel

8 is a block diagram for obtaining the characteristics of the tension control system of FIG.

9 is a block diagram for obtaining the characteristics of the tension control system of FIG. 7 during acceleration and deceleration of a capster motor.

10 (a) and (b) show the correlation between the rotational speed of the capstan motor and the correction torque of the take-up reel motor.

11 is a correlation diagram of the discharge amount of the tape, the drive speed of the capstan motor, and the torque correction signal of the supply reel motor.

12 is a state diagram showing a process of finding a phase and a target speed of a tape during double speed playback.

* Description of the symbols for the main parts of the drawings *

11: tension post 12: tension lever

13: spring 14: detector

15 controller 16 supply reel drive motor

17 Supply Reel 18 Tape

19: take-up reel 20: take-up reel motor

21: head drum 22: capstan

23: pinch roller 24: tension lever shaft

25, 26: odometer guide post

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double speed reproduction method of DVCR (Digital VCR), and more particularly to a double speed reproduction of a DVCR which reproduces an I-frame at a high speed without changing the arrangement of data recorded on a tape. It is about a method.

In the conventional double speed regeneration method, in the case of double speed regeneration, the rotational speed of the head drum is maintained at the constant speed or the feed speed of the tape. Therefore, the head forms a trajectory across the track as shown in FIG. Can be detected and reproduced at a discontinuous data type having a size inversely proportional to the feed rate of the tape, that is, data burst.

In a conventional analog VCR, a frame recorded on a videotape is divided, and one field of data is recorded in the order in which one track is played. Therefore, the detection area on a track is directly related to the playback area of the corresponding screen in the double speed playback mode. Therefore, even if a noise bar is generated, the double speed video can be reproduced.

In the case of DVCR, however, data of one field is recorded in several tracks as shown in FIG. 1, so that the reproduction bursts of adjacent tracks are not directly related to the playback order. Writing to a detectable data burst area at double speed has a problem that requires complex hardware to rearrange the frame memory and data.

In general, image compression is performed by dividing an image sequence into a predetermined number of frames, for example, a group of 15 frames, that is, a group of pictures (GOP) by an image compression method that employs an image signal in an inter-frame and inter-frame encoding scheme.

The state in which the image is compressed and recorded on the tape will be described with reference to FIG.

The original video signal is composed of a plurality of uncompressed frames I1, B1, P1, ..., I2, B2, P2, ... as shown in FIG. Here, a certain number of frames, for example, 15 frames are gathered to form one group of pictures (G1, G2).

The uncompressed video signal (Fig. 2 (a)) is compressed through encoding and quantization as shown in Fig. 2 (b) so that the first frame of the GOP becomes I-frames I1 'and I2'. The remaining frames of the GOP except for the first frame are P-frames (P1 ', P2') and B-frames (Bidirectional Predictive-Frames) B1 ', B2'. In this case, one GOP (G1, G2) includes one I-frame (I1 ', I2'), multiple P-frames (Pdictive-Frame) (P1 ', P2'), and multiple B-frames (Bidirectional Predective). -Frame) (B1 '..., B2' ...)

In this case, the I-frames I1 'and I2' corresponding to the first frame of the GOP are compressed by encoding in the frame, so that only one I-frame can be displayed on the monitor, but the P-frames P1 'and P2' B-frames (B1 '..., B2' ...) are encoded and quantized using correlations with the front or back frames, so they can be displayed on the monitor after being restored to the video signal using the front or back frames. have. Therefore, the double speed playback can be easily performed only by using the I-frame corresponding to the first frame of the GOP.

In addition, since each GOP is variable-length coded, the size of the compressed bitstream of each GOP is not constant, as shown in FIG. 2 (B). As shown, the I-frame, which is the starting point of each GOP, cannot come to a certain position.

However, the compressed bitstream of the GOP has a slight error, but it occurs at regular intervals on average, so it can find a location where an average I-frame is included for a certain interval of tapes. That is, at least one I-frame I1 ', I2', I3 'exists in each of the GOPs G1, G2, and G3 as shown in FIG.

Therefore, the present invention utilizes the property that at least one I-frame exists within a certain interval of the tape, so that it is possible to record on the tape without realigning the signal during recording, and to double-speed playback during double speed playback. Its purpose is to provide a regeneration method.

In order to achieve the above object, the present invention performs an end point search of the I-frame to find the end point of the I-frame (Intra-Frame) while performing a normal playback function, the acceleration and deceleration of the driving speed of the capstan motor for a predetermined time skip A skipping step and an I-frame reproducing step of reproducing an I-frame by performing a normal reproducing function.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The following describes the DVCR double speed playback method according to the present invention with reference to FIG.

First, when the user enters the double speed mode, an end point search step (1, 2) of the I-frame is performed to find the end point of the I-frame (Intra-Frame) while performing a normal playback function.

If the end point of the I-frame is found as a result of performing the I-frame end point search step (1, 2), the skip step (3, 4, 5) of acceleration and deceleration of the driving speed of the capstan motor is performed for a predetermined time. That is, the acceleration skip step (3) of accelerating and skipping the driving speed of the capstan motor for a predetermined time, the constant speed skipping step (4) of driving the driving speed of the capstan motor at an accelerated speed for a predetermined time and skipping the capstan motor A deceleration skip step 5 of decelerating and skipping the driving speed is performed.

In this case, the acceleration and deceleration skip steps 3 and 5 accelerate and decelerate the driving speed of the capstan motor for a predetermined time according to the limit of the acceleration capability of the capstan motor and the driving capability of the supply reel and take-up reel. In other words, the time to accelerate and decelerate the driving speed of the capstan motor is determined according to the maximum limit of the capstan motor's maximum acceleration capacity and the driving capacity of the supply reel and take-up reel. This can be done, so it is good to reduce the acceleration and deceleration time to the maximum. After the skipping steps 3, 4, and 5, a normal playback function is performed to perform an I-frame playback step 6 for playing back an I-frame. Here, the I-frame reproducing step 6 for reproducing the I-frame may be performed by performing a normal reproducing function to reproduce one GOP (Group Of Picture) instead of one I-frame.

When performing the I-frame playback step (6) by playing one group of pictures (GOP) instead of one I-frame, the end point search steps (1, 2) of the I-frame perform a normal playback function. Instead of finding the point where one I-frame ends, it finds the point where one GOP ends.

The double speed reproduction method of the DVCR according to the present invention will be described with reference to FIG. 4 according to the driving speed of the capstan motor.

The signal corresponding to the I-frame among the image compressed signals is recorded on the tape as shown in FIG. 4 (a) and the driving speed of the capstan motor is explained with reference to FIG. 4 (b) in the process of double speed playback. Is as follows.

When the double speed play command is input, the capstan motor is driven to play at the normal speed (N), which is the normal play speed, so that the end point of the I-frame where the I-frame ends can be searched. Finding the end point of the I-frame increases the driving speed of the capstan motor for a certain time and accelerates it to n times the normal speed (N). At this time, the time to accelerate the capstan motor is set to take a short time depending on the acceleration capacity of the capstan motor and the driving capacity of the supply reel and take-up reel.

Increase the driving speed of capstan motor to n times normal speed and drive capstan motor at n times normal speed for a certain time. At this time, the time to drive the capstan motor at n times the normal speed is determined according to the desired speed.

The driving speed of the capstan motor is driven at a constant n times the normal speed for a predetermined time, and then the driving speed of the capstan motor is decelerated for a predetermined time to decelerate to the normal speed (N). At this time, the deceleration time of the capstan motor is set slightly longer than the acceleration time, which is determined by the limitations of the acceleration capability of the capstan motor and the driving capability of the supply reel and take-up reel. When decelerating the capstan motor, more time is spent to predict the phase error and to find the target speed and phase.

After reducing the driving speed of the capstan motor to the normal speed and driving again at the normal speed (N), which is the normal playback speed, for a predetermined time, the end point of the I-frame where the I-frame ends can be searched. At this time, the I-frame is played, the time for finding the end of the I-frame is set to be slightly longer than the GOP time, and when the end point of the I-frame is found, the driving step of the capstan motor is accelerated and decelerated again.

In this way, it is possible to perform double speed reproduction by repeatedly changing the driving speed of the capstan motor, and the double speed reproduction is performed while the scene changes every predetermined time. The driving relationship between the capstan motor and the supply reel driving the DVCR tape will be described with reference to FIG. 5 showing the tension control system.

In the tension control system of the VCR, as shown in FIG. 5, the tension post 11 is fixed to one end of the tension lever 12, and the other end of the tension lever 12 is installed on the shaft 24 so as to be rotatable on the base. The tension lever 12 is elastically installed on the support by the spring 13 to prevent the tape 18 from sagging during the transfer of the tape 18. Therefore, when the tape magazine is inserted into the insertion slot of the tape magazine, the tape magazine is loaded and mounted on the hub of the supply reel 17 and the take-up reel 19, thereby enabling the tape to travel.

In this state, when the capstan motor starts to operate at the normal regeneration speed, the tape 18 wound on the supply reel 17 by the frictional feeding force of the capstan and the pinch roller 23 is pressed into the tension post 11 and the head drum. Passed by (21) is wound on the take-up reel (19).

In other words, the tape of the supply reel 17 is unwound by the amount of the tape 18 wound on the take-up reel 19 to be reproduced or recorded while passing through the head drum 21 and passed through the head drum 21. ) Is wound around the take-up reel (19).

In addition, to control the tension of the tape 18, one end of the tension lever 12 is connected to a detector 14 for detecting the rotational phase θa of the tension lever 12, and a supply reel (at the output end of the detector 14) By generating a torque control signal for controlling the torque of the 17) is connected to the controller 15 for controlling the supply reel 17 to adjust the tension of the tape (18).

That is, when the tension is strong while the tape 18 is traveling, the tension lever 12 receives the force clockwise about the shaft 24 by the tension of the tape 18, and thus the phase of rotation of the tension lever 12. (theta) a becomes large.

Then, a larger rotational phase θa is detected at the detector and input to the controller 15, and the controller 14 is applied clockwise only to the supply reel 17, which is a direction in which the rotational phase θa of the tension lever 12 is reduced. By applying a torque control signal to the drive motor 16 of the supply reel 17 in the direction of weakening the lost torque, the tension of the tape 18 is weakly adjusted again so that the constant tension is maintained while the tape 18 is running. do.

On the contrary, when the tension of the tape 18 is weak, the rotational phase θa of the tension lever 12 becomes small, so that the torque control signal for increasing the torque applied to the supply reel 17 in the counterclockwise direction is increased. The tension of the tape 18 is again strongly assembled by applying it to the drive motor 16 of 17 so that a constant tension is maintained while the tape 18 is traveling.

The mathematical modeling to obtain the characteristics of the tension control system will now be described with reference to FIG.

The equations of motion related to the rotation of the supply reel 17 are as follows: (1), (2) and (3).

Where Rs is the radius of the supply reel, f1 is the tension of the tape between the capstans in the supply reel 17, Ts is the torque acting in the unwinding direction of the supply reel, Js is the moment of inertia of the supply reel, and Ws is the The rotational angular velocity, θs, is the rotational phase of the supply reel, and Xs is the length of the tape released from the supply reel.

The Laplace transform of the above equations (1), (2) and (3) gives the following equations (1-1), (2-1) and (3-1).

--- Formula (1-1)

--- Equation (2-1)

--- Equation (3-1)

According to the above equation, as shown in FIG. 6, a tension control system may be illustrated as a block. A process of determining the tension of a tape in the tension control system will now be described with reference to FIG. 6.

If the rotational phase of the tension lever 12 is at a certain position, the tape 18 from the contact point A of the capstan 22 and the pinch roller 23 to the contact point B from which the tape is released from the supply reel 17 is accordingly. The reference distance (Lref) is determined according to the traveling route of) and the function determined at this time is determined by the mechanical design values of the tape traveling system and the tension control system.

In addition, the reference distance (Lref) according to the driving route also varies depending on the radius of rotation of the supply reel 17, but it is mainly determined by the rotational phase (θA) of the tension lever 12 to see the dynamic characteristics for a short time. have. This relationship is represented by f in FIG.

The length (L) of the tape when the tension is removed from the tape hanging from the contact (A) of the capstan (22) and the pinch roller to the contact (B) is the length of the tape (Xs) released from the supply reel (17). Is the value obtained by subtracting the capstan tape discharge amount Xc, which is the length of the tape passing through the capstan 22 and the pinch roller 23, and the length of the tape L minus the reference distance Lref according to the driving route. The length of the tape is to be extended, and the tension of the tape is obtained by multiplying the spring constant K1 of the tape from the supply reel 17 to the capstan and the pinch roller 23.

The movement state of the tension lever 12 is as follows.

The force F acting counterclockwise to the tension lever 12 is

_{F = (L 1 · θa-} Ps) · k

Where L ₁ is the distance from the shaft 24 of the tension lever 12 to the point C connected with the spring 13, Ps is adjusted to produce a predetermined force when the tension post 11 is in the design position The position of the spring anchor point for k, k is the spring constant of the spring (13).

Therefore, the torque (T ₁ ) acting counterclockwise is

_{T 1 = (L 1 · θa} -Ps) · k · L 1

Becomes

The torque T ₂ acting clockwise on the tension lever 12 is tensioned at a ratio γ determined by the geometric arrangement of the guide posts 25 and 26, the tension post 11, and the tension lever 12. This is the torque multiplied by. That is, the ratio γ is a value that changes depending on the rotational phase θa of the tension lever 12. Therefore, the equation of motion of the tension lever 12 is as follows.

--- Equation (4)

--- Equation (5)

Is the ratio of the torque acting clockwise to the tension lever 12 relative to the tension f1 of the tape, Wa (t) is the rotational angular velocity of the tension lever 12, and θa (t) is the rotational phase of the tension lever. Respectively.

Laplace transform of the above equations (4) and (5) results in the following equations (4-1) and (5-1).

--- Equation (4-1)

--- Equation (5-1)

Where Υ is treated as a constant for the small change in θa and a part of FIG. 6 is drawn from the above equation. The modeling of the controller is based on the case of using a Proportional Integral Derivative (PID) controller.

Where Kp is proportional gain, Ki is integral gain, and Kd is derivative gain.

As described above, the tension control system during normal regeneration is constructed and mathematical modeling is performed to obtain dynamic characteristics.

As described above, the tension control system has a property that the control target is the fourth order, its time constants are large, and the control input is one torque (Ts) applied to the supply reel 17 so that it takes a long time to reach a steady state. Therefore, when the acceleration or deceleration of the capstan motor is rapidly accelerated, it takes more than a second to reach the steady state.

The driving relationship between the capstan motor and the take-up reel 19 for moving the tape of the DVCR will be described with reference to FIG. 7 showing the tension control system.

The tension control system from the capstan 22 to the take-up reel 19 has a structure in which the tape conveyed by the frictional conveying force by the compression of the capstan 22 and the pinch roller 23 is wound as shown in FIG. Is done. In this state, when the capstan motor starts to operate at the normal regeneration speed, the tape wound on the supply reel is wound onto the take-up reel 19 through the capstan 22 and the pinch roller 23.

At this time, the tension (f ₂ ) of the tape wound on the take-up reel (19) is set by the torque (Tt) applied to the take-up motor (20). Referring to the drawings as follows.

If the radius of the take-up reel 19 is Rt during normal regeneration, the torque (T2) is applied to the drive motor 20 of the take-up reel so that the tape is wound with a constant tension. same.

---- Formula (6)

In other words, if the torque Tt applied to the drive motor 20 of the take-up reel is controlled to be proportional to the radius Rt of the take-up reel, the tension of the tape on which the take-up reel 19 is wound may be kept constant. Can be.

In order to find out the dynamics of the above system, the equation of motion related to the rotation of the take-up reel (19) is obtained.The following equations (7), (8), (9), (10), (11), and (12) Same as

--- Equation (7)

f2 (t) = k2 (Xt (t) -Xc (t)) --- Equation (8)

--- Equation (9)

Xt (t) = Rtθc (t) --- Equation (10)

Xc (t) = Rc θc (t) --- Equation (11)

--- Equation (12)

Where Tt is the torque applied to the drive motor 20 of the take-up reel, Rt is the radius of the take-up reel 19, f2 is the tension of the tape between the capstan 22 and the take-up reel 19, Jt is the take Moment of inertia of the up-reel 19, Wt is the rotational angular velocity of the take-up reel, k2 is the spring constant of the tape between the capstan motor and the take-up reel, Xt is the tape travel amount at the contact point with the take-up reel 19, θt Is the rotational phase of the take-up reel 19, Xc is the discharge amount of the tape from the capstan 22 and the pinch roller 22.

Laplace transform of the above formulas (7), (8), (9), (10), (11), and (12), and the following formulas (7-1), (8-1), (9-1), (10-1), (11-1), and (12-1).

--- Equation (7-1)

f2 (s) = k2 (Xt (s) -Xc (s)) --- Equation (8-1)

--- Equation (9-1)

Xt (s) = Rtθt (s) --- Equation (10-1)

Xc (s) = Rcθc (s) --- equation (11-1)

--- Equation (12-1)

Rc is the radius of the axis of the capstan motor, θc is the rotational phase of the capstan 22, Wc is the rotational angular velocity of the capster 22.

Eight degrees can be drawn from the above equations.

The amount of torque to be corrected when increasing or decreasing the rotational speed of the capstan motor is discharged from the capstan and the pinch roller 23 according to the change in the rotational speed Wc of the capstan motor as shown in FIG. The discharge amount Xc of the tape changes, so that the corrected torque Tc (s) is set so that the amount of change is equal to the amount Xt of the tape wound on the take-up reel 19.

To be added.

For example, when the rotational speed of the capstan motor changes to a large wave as shown in FIG. 10, the correction torque can be obtained as shown in Equation (13) below.

--- Equation (13)

Where Rc is a constant, Wc1, Wc2, Δt are known values while controlling the capstan motor, and Rt, Jt can be obtained by calculating the amount of progress of the tape.

The reel radius (Rs, Rt) and moments of inertia (Js, Jt) can be obtained by the following equations (14), (14 ') (15) and (15').

--- Equation (14)

--- Equation (14 ')

--- Equation (15)

--- Formula (15 ')

Where W is the width of the tape, ρ is the density of the tape, Rmin is the radius when the tape is fully loose, Js ', Jt' is the initial value of the moment of inertia of the reels other than the tape, namely reel in terms of reel table and reel axis. The moment of inertia of the rotor of the motor, g, is the acceleration of gravity.

The correlation between the discharge amount Xc of the tape, the drive speed Wc of the capstan motor, and the torque correction signal Tr is described with reference to FIGS. 11 (a) and (b). The explanation is as follows.

First, when the driving speed of the capstan motor accelerates for double speed regeneration, the driving speed Wc of the capstan motor is linearly increased and the discharge amount Xc of the tape is quadratically increased in the section A of FIG. do. At this time, the total torque signal Ts is formed by summing the torque correction signal Tr (b-2) consisting of square waves and the tension control signal B-3 in the steady state as shown in (b-1). That is, the driving speed of the capstan motor is changed linearly and the torque correction signal is composed of square waves.

At this time, the torque correction signal (B-2) can be adjusted while increasing or decreasing the size according to the tape reel of the supply reel, or increasing or decreasing the time while the capstan's acceleration or deceleration time is kept constant. have.

In addition, in the case where the driving speed of the capstan motor is accelerated for double speed reproduction and driven at a constant speed, the driving speed Wc of the capstan motor appears to be constant and the discharge amount Xc of the tape is 1 in the section B of FIG. Incrementally functionally. At this time, the total torque signal Ts is obtained by summing the torque correction signal (B-2) in the '0' state and the signal (B-3) indicating the tension in the normal state, as shown in (B-1). In other words, the driving speed of the capstan motor appears to be constant and the torque correction signal is made of '0' so that the entire torque signal Tr is made only of the tension control in the normal state.

In addition, in the case where the driving speed of the capstan motor is accelerated for double speed regeneration and then driven at a constant speed and then decelerated, the driving speed Wc of the capstan motor is linearly decreased in the section C of FIG. 11 and the discharge amount Xc of the tape ) Is quadratic reduced. At this time, the total torque signal Tr is formed by summing the torque correction signal (B-2) consisting of square waves and the signal (B-3) indicating tension in a steady state, as shown in (B-1). That is, the driving speed of the capstan motor is changed linearly and the torque correction signal is composed of square waves.

At this time, the torque correction signal (B-2) can be adjusted while increasing or decreasing the size according to the tape reel of the supply reel, or increasing or decreasing the time while the capstan's acceleration or deceleration time is kept constant. have.

When the driving speed of the capstan motor is changed for double speed reproduction, a process of finding the phase and the target speed of the tape will be described with reference to FIG. 12.

When the end point of the I frame is found or the end point of one GOP is found (D), the driving speed (Wc) of the capstan motor is linearly increased and the discharge amount (Xc) of the tape is increased quadratically. The capstan motor, the drive motor of the supply reel, and the drive motor of the take-up reel are operated while the speed is controlled.

When the tapstan motor is accelerated for a certain time to reach a constant speed (E), the capstan motor is driven at an accelerated speed for a certain time, and the control of the supply reel and take-up reel is in the normal state with the torque compensation signal being 0. Controlled by the control means.

When the capstan motor starts to decelerate after driving at an accelerated speed for a certain time (F), the capstan motor decelerates linearly and decelerates to the normal regeneration speed (H).

When the capstan motor decelerates and the drive speed is below a certain speed, for example, about three times normal playback (G), the frequency generation pulse signal (FG: Frequency Generation Pulse) of the capstan motor and the control signal (CTL: Control) on the tape ) To find the target speed and phase by estimating the phase error and the current speed.

For example, if m frequency generating pulse signals FG of the capstan motor occur while the control signal CTL of one cycle is generated on the tape during normal playback, the generation period of the frequency generating pulse signal FG of the capstan motor is After the control signal CTL on the tape is generated after a predetermined period or more, the phase error is measured by measuring the phase error for each frequency generated pulse signal FG using the frequency generating pulse signal FG of the capstan motor. do.

As described above, according to the present invention, the speed of the capstan motor is controlled in time during the double speed reproduction of the DVCR, so that the double speed reproduction of the DVCR can be performed regardless of the arrangement of the video signals recorded on the tape.

Claims (15)

An end point search step of the I-frame that finds the end point of the I-frame while performing normal playback; Acceleration and deceleration of the capstan motor by driving for a predetermined time and skipping, and when the capstan motor reaches a predetermined speed, the capstan motor keeps the speed of the capstan motor constant and skips. 12. A method for double speed playback of a DB-C, characterized by repeatedly performing an I-frame playback step of playing an I-frame by performing a normal playback function. The method of claim 1, The I-frame reproducing step is performed by reproducing one group of picture (GOP) while performing a normal reproducing function. The method of claim 1, The end point searching step of the I-frame is performed by finding a point where one GOP ends while performing a normal playback function. The method of claim 1, In the acceleration / deceleration skip step, the acceleration skip is performed by accelerating and skipping the driving speed of the capstan motor for a predetermined time according to the limit of the acceleration capacity of the capstan motor and the driving capacity of the supply reel and take-up reel. The dexial speed reproduction method of claim 2, characterized in that the decelerating capacity of the capstan motor and the driving capacity of the supply reel and take-up reel is performed by decelerating and skipping the driving speed of the capstan motor for a predetermined time. The method of claim 1, In the acceleration / deceleration skip step, the acceleration skip and the deceleration skip respectively output torque correction signals to the supply reel so that the length of the tape released from the supply reel is equal to the length of the tape exiting the capstan. A double speed regeneration method of a DVC characterized in that the correction is performed. The method of claim 1, In the acceleration / deceleration skip step, the acceleration skip and the deceleration skip are performed by correcting torque by outputting a torque correction signal to the take-up reel such that the length of the tape coming out of the capstan is equal to the length of the tape wound on the take-up reel. Double speed regeneration method of the DV. The method of claim 5, Driving speed of the capstan motor is linearly changed and the torque correction signal is a double speed regeneration method of the DC seed, characterized in that consisting of a square wave The method of claim 6, The drive speed of the capstan motor is linearly changed, the torque correction signal is a double speed regeneration method of the DC seed, characterized in that consisting of a square wave. The method according to claim 7 or 8, And the torque correction signal changes one of the size and the length according to the tape winding amount of the supply reel or take-up reel. The method of claim 1, The deceleration skip step may include a phase error using a frequency generation pulse signal (FG) of the capstan motor and a control signal (CTL) on a tape when the capstan motor drive speed is lower than a predetermined speed. Double speed playback method of the DVC characterized in that to find the target speed and phase in anticipation of the current speed. The method of claim 1, In the acceleration / deceleration skip step, the acceleration skip speeds up the driving speed of the capstan motor for 0.1 second and skips. The method of claim 1, In the acceleration / deceleration skip step, when the constant speed skip is reproduced at 8 times speed, the drive speed of the capstan motor is driven at an accelerated speed for 0.8 seconds to skip. The method of claim 1, In the acceleration / deceleration skip step, a predetermined speed skip is performed by driving the drive speed of the capstan motor at an accelerated speed for 1.6 seconds when the speed is reproduced at 11 times the speed. The method of claim 1, In the acceleration / deceleration skip step, the deceleration skip decelerates the driving speed of the capstan motor for 0.2 seconds and skips. In the redistribution method of DCVR having the step of determining the double speed playback mode by skipping the acceleration / deceleration data corresponding to the double speed playback mode from the tape and applying it to the capstan motor when the end point of the I-frame is detected. , Supplying a torque correction signal to either the supply reel or the take-up reel after increasing the speed of the capstan motor to match the tape loading speed of the reel to the speed of the capstan motor, Maintaining a constant speed of the capstan motor when the capstan motor becomes a predetermined speed after a predetermined time elapses from the matching step; Reducing the speed of the capstan motor by supplying a servo control signal to one of the supply reel and take up reel; And retrieving the target speed and target phase of the capstan motor by using the frequency signal of the capstan motor and the control signal on the tape when the speed of the capstan motor is lower than the predetermined speed. .