KR20030094700A - Multimedia Replaying Device for Reducing Influence of Shock - Google Patents

Abstract

PURPOSE: An apparatus for playing multimedia for reducing the effect of a shock is provided to minimize a play error due to a shock by selectively applying a CAV method or CLV method. CONSTITUTION: An optical pickup(122) discharges an optical beam to a disk to be played, and outputs an RF(Radio Frequency) signal corresponding to a reflective wave of the optical beam. A signal converter(100) receives the RF signal for generating an error check signal related to the RF signal, and converting the RF signal into a digital signal. A pickup servo unit(102) receives the error check signal for providing control information related to a focusing direction and a tracking direction of the optical pickup to the optical pickup. A synchronization control unit(104) receives the digital signal for according synchronization to a processing speed of the digital signal. A demodulation/error correction unit(106) receives an output signal of the synchronization control unit for demodulating the output signal and correcting an error by using an error code preliminarily set. A rotary mode control unit(108) controls a spindle motor(124) to be operated in a CAV(Constant Angular Velocity) rotary mode in a situation where large shocks are generated, while controlling the spindle motor to be operated in a CLV(Constant Linear Velocity) rotary mode in a situation where small shocks are generated.

Description

Multimedia Replaying Device for Reducing Influence of Shock

The present invention relates to a multimedia playback device for reducing the impact of impact, and more particularly, to a multimedia playback device for changing the disk rotation mode of the playback device in the event of a lot of impact.

In general, multimedia playback devices such as CD players and DVD players provide low speed control of about 1 to 4 times the speed when playing multimedia signals. The faster the data processing, as in a computer, the more advantageous the device. On the other hand, the multimedia playback device needs to reproduce the recorded multimedia signal at the original speed neatly. In addition, in the portable multimedia playback device, the lower the current consumption, the smaller the speed and the noise due to the excessive current change.

In addition, the high frequency signal of the reproduced analog signal is degraded at higher speeds, which affects the stability of the system.

For this reason, the CLV (Constant Linear Velocity) rotation method is generally used as a disk rotation method for controlling low speed. According to the CLV method, the data processing speed is always controlled at the inner or outer circumference of the disc, and the rotational speed of the disc is about 200 rpm at the outer circumference of about 500 rpm in the inner circumference when the rotation speed of the disc is 1x. Different.

On the other hand, the CD-ROM used as a computer peripheral device requiring high speed has a problem in that heat is generated in the motor driving IC due to high-speed access of data, thereby causing a problem in reliability. The solution to solve this problem is CAV (Constant Angular Velocity). In contrast to the CLV, the CAV rotation method constantly controls the rotational speed of the disk, so that the data processing speed varies depending on the inner and outer circumferences.

As described above, in the multimedia reproducing apparatus, high speed is not required and the system configuration can be simply implemented, so the CLV method is mainly used. However, the CLV rotation control method has a problem of easily causing data errors when an impact occurs.

In order to solve the problems of the prior art as described above, the present invention proposes a multimedia playback apparatus that can minimize a playback error by reacting insensitively even when an impact occurs.

Another object of the present invention is to propose a multimedia playback apparatus capable of minimizing the effects of shock by selectively using the CLV method and the CAV method.

It is still another object of the present invention to propose a multimedia playback apparatus capable of minimizing the effects of shock by selectively using the CLV method and the pseudo CLV method.

1 is a view showing the overall configuration of a multimedia playback device for reducing the impact impact according to a preferred embodiment of the present invention.

2 is a block diagram showing a detailed configuration of a signal converter according to a preferred embodiment of the present invention.

Figure 3a is a block diagram showing a detailed configuration of a rotation mode control unit according to an embodiment of the present invention.

Figure 3b is a block diagram showing a detailed configuration of a rotation mode control unit according to another embodiment of the present invention.

Figure 3c is a block diagram showing a detailed configuration of a rotation mode control unit according to another embodiment of the present invention.

Figure 3d is a block diagram showing a detailed configuration of a rotating board control unit according to another embodiment of the present invention.

4 is a block diagram showing a detailed configuration of a CLV control unit according to an embodiment of the present invention.

5 is a block diagram showing a detailed configuration of a CAV control unit according to an embodiment of the present invention.

6A is a block diagram showing a detailed configuration of a pseudo CLV control unit according to an embodiment of the present invention.

6B is a block diagram showing a detailed configuration of a pseudo CLV control unit according to another embodiment of the present invention.

7A is a block diagram showing the configuration of a clock generator in accordance with one preferred embodiment of the present invention.

7B is a block diagram showing a configuration of a clock generator according to still another embodiment of the present invention.

7C is a block diagram showing a configuration of a clock generator according to another embodiment of the present invention.

8 is a flow chart showing the operation of the multimedia playback device for reducing the impact impact according to a preferred embodiment of the present invention.

9 is a flow chart showing the operation of the multimedia playback device for reducing the impact impact according to another embodiment of the present invention.

In order to achieve the above object, the multimedia playback apparatus for reducing the impact of impact according to the present invention includes an optical pickup for emitting a light beam to the disc to be reproduced, and outputs an RF signal corresponding to the reflected wave of the emitted light beam; A signal converter configured to receive an RF signal output by the optical pickup, generate an error check signal for the RF signal, and convert the RF signal into a digital signal; A pickup servo unit receiving an error check signal output from the signal converter and providing control information regarding a focusing direction and a tracking direction of the optical pickup to the optical pickup; A synchronization controller which receives the digital signal output from the signal converter and synchronizes the synchronization with respect to the processing speed of the digital signal; A demodulation / error correction unit for receiving and demodulating the output signal of the synchronization control unit and correcting an error using a predetermined error code; A rotation mode control unit controlling the spindle motor to operate in a CAV rotation mode in a situation where a lot of shocks occur, and controlling the spindle motor to operate in a CLV rotation mode in a situation where a lot of shocks do not occur; And a clock generator configured to provide a reference clock signal to the rotation mode controller.

The signal converter amplifies the RF signal transmitted from the optical pickup and provides a focusing servo error signal and a tracking servo error signal to the pickup servo by slicing the amplified RF signal output from the head amplifier and a square wave shape. It may include a data slicing unit for converting into a signal of.

According to one embodiment of the invention, the rotation mode control unit, CLV control unit for generating an error signal to rotate the disc to be reproduced in accordance with the CLV method; A CAV control unit for generating an error signal to rotate the disc to be reproduced according to the CAV method; A driving amplifier which receives an error signal from either the CLV controller or the CAV controller to control the rotational speed of the spindle motor; A switch for connecting one of the CLV controller or the CAV controller to the driving amplifier according to the rotation mode selection information of the user; And a rotational speed detector configured to provide rotational speed information of the spindle motor to the CAV controller.

According to another embodiment of the present invention, the rotation mode control unit, CLV control unit for generating an error signal to rotate the disc to be reproduced in accordance with the CLV method; A CAV control unit for generating an error signal to rotate the disc to be reproduced according to the CAV method; A driving amplifier which receives an error signal from either the CLV controller or the CAV controller to control the rotational speed of the spindle motor; A sensor for detecting whether an impact occurs; A switch configured to connect any one of the CLV control unit or the CAV control unit to the driving amplifier unit according to the impact occurrence detection information of the sensor; And a rotational speed detector configured to provide rotational speed information of the spindle motor to the CAV controller.

According to another embodiment of the present invention, the rotation mode control unit, CLV control unit for generating an error signal to rotate the disc to be reproduced in accordance with the CLV method; A CAV control unit for generating an error signal to rotate the disc to be reproduced according to the CAV method; A driving amplifier which receives an error signal from either the CLV controller or the CAV controller to control the rotational speed of the spindle motor; A switch for connecting one of the CLV controller or the CAV controller to the driving amplifier according to the rotation mode selection information of the user; And a rotational speed detector configured to provide rotational speed information of the spindle motor to the CAV controller.

The CLV control unit. A CLV reference clock receiver configured to receive a CLV reference clock signal from the clock generator; A synchronization signal receiving unit which receives a synchronization signal relating to a speed of processing data from the synchronization control unit; A comparison unit comparing the synchronization signal with the CLV reference clock signal and generating an output signal when there is a difference; It may include an error signal generator for generating an error signal corresponding to the output signal of the comparator and provided to the drive amplifier.

The CAV controller may include a CAV reference clock receiver configured to receive a CAV reference clock signal from the clock generator; A rotation information receiver configured to receive rotation speed information of the spindle motor from the rotation speed detector; A comparison unit comparing the rotational speed information of the spindle motor with the CAV reference clock signal and generating an output signal when there is a difference; It may include an error signal generator for generating an error signal corresponding to the output signal of the comparator and provided to the drive amplifier.

The clock generator includes: a CLV reference clock generator configured to generate a CLV reference clock signal for maintaining a constant processing speed of data; It may include a CAV reference clock generator for generating a CAV reference clock signal for maintaining a constant rotational angular velocity of the spindle motor.

On the other hand, multimedia playback apparatus for reducing the impact impact according to another embodiment of the present invention includes an optical pickup for emitting a light beam to the disc to be reproduced, and outputs an RF signal corresponding to the reflected wave of the emitted light beam; A signal converter configured to receive an RF signal output by the optical pickup, generate an error check signal for the RF signal, and convert the RF signal into a digital signal; A pickup servo unit receiving an error check signal output from the signal converter and providing control information regarding a focusing direction and a tracking direction of the optical pickup to the optical pickup; A synchronization controller which receives the digital signal output from the signal converter and synchronizes the synchronization with respect to the processing speed of the digital signal; A demodulation / error correction unit for receiving and demodulating the output signal of the synchronization control unit and correcting an error using a predetermined error code; Control the spindle motor to operate in the CAV rotation mode in the event of a lot of shock, and control the spindle motor to operate in the pseudo CLV rotation mode of varying data processing speed according to the playback position in the case of no impact. A rotation mode controller; And a clock generator configured to provide a reference clock signal to the rotation mode controller.

The rotation mode controller may include a CLV controller configured to generate an error signal to rotate a disc to be played according to a CLV method; A pseudo CLV control unit for generating an error signal to rotate a disc to be reproduced according to a pseudo CLV scheme having a different data processing speed depending on the reproduction position; A driving amplifier which receives an error signal from either the CLV controller or the pseudo CLV controller to control a rotational speed of the spindle motor; And a switch connecting one of the CLV control unit and the pseudo CLV control unit to the driving amplifier unit according to the rotation mode selection information of the user.

According to one embodiment of the invention, the pseudo CLV control unit, the position determination unit for determining the position information that the data of the disc is reproduced; A clock change unit configured to change and output a pseudo CLV reference clock signal according to output information of the position determiner; A synchronization signal receiving unit which receives a synchronization signal relating to a speed of processing data from the synchronization control unit; A comparison unit comparing the output signal of the clock change unit with the synchronization signal and generating an output signal when there is a difference; It may include an error signal generator for generating an error signal corresponding to the output signal of the comparator and provided to the drive amplifier.

According to another embodiment of the present invention, the pseudo CLV control unit includes: a pseudo CLV reference clock receiver configured to receive a pseudo CLV reference clock signal changed according to a position at which data is reproduced on a disk; A synchronization signal receiving unit which receives a synchronization signal relating to a speed of processing data from the synchronization control unit; A comparison unit comparing the pseudo CLV reference clock signal with the synchronization signal and generating an output signal when there is a difference; It may include an error signal generator for generating an error signal corresponding to the output signal of the comparator and provided to the drive amplifier.

The position determiner may determine a play position by using the play time information provided by the demodulation / error corrector or determine a play position by detecting a position of the optical pickup.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the multimedia playback device for reducing the impact of impact according to the present invention.

1 is a view showing the overall configuration of a multimedia playback device for reducing the impact impact according to a preferred embodiment of the present invention.

As shown in FIG. 1, the multimedia reproducing apparatus according to the preferred embodiment of the present invention includes a signal converter 100, a pickup servo unit 102, a synchronization controller 104, a demodulation / error correction unit 106, and a rotation. The mode controller 108, the clock generator 110, the oscillator 112, the microprocessor 114, the RAM 118, the D / A converter 120, the optical pickup 122, and the spindle motor 124 may be connected. Include.

In FIG. 1, the optical pickup 122 generally includes a laser diode, an objective lens, a beam splitter, and a photo detector. The objective lens of the optical pickup 122 emits a light beam to the disc to be reproduced, and the emitted light beam is reflected from the disc, and the reflected light beam is incident on a beam splitter, which is in turn input to a photo detector. Is entered. The photo detector outputs an electrical signal corresponding to the input signal in the form of an RF signal, and the output RF signal is input to the signal converter 100.

The signal converter 100 receives the RF signal transmitted from the optical pickup 122 to generate an error check signal for the RF signal, and converts the RF signal into a digital signal capable of processing the RF signal.

The pickup servo unit 102 receives an error check signal output from the signal conversion unit and provides control information regarding the focusing direction and the tracking direction of the optical pickup 122 to the optical pickup 122.

The synchronization controller 104 generates a reference clock and synchronizes the processing speed of the signal output from the signal converter 100 with the generated reference clock to synchronize synchronization with respect to the signal processing speed.

The demodulation / error correction unit 106 functions to demodulate the signal output from the synchronization control unit 104 and correct an error caused by scratching or the like of the disk. Correction of an error is performed using a predetermined error code, and the CRC method may be used.

The RAM 118 stores an error code and provides a data processing space for demodulation and error correction performed by the demodulation / error correction unit.

The D / A converter 120 converts the digital signal output from the demodulation / error correction unit 120 into an analog signal and provides an audio signal to the speaker.

The microprocessor functions to control the overall operation of the multimedia playback apparatus according to the present invention.

The rotation mode controller 108 converts the rotation mode into a rotation mode insensitive to shock when an impact occurs through a user's selection or detection of a sensor.

According to an embodiment of the present invention, a switch that can switch the rotation mode is provided outside, so that the rotation mode can be changed according to the user's switch setting.

According to another embodiment of the present invention, the sensor may be provided with a shock sensor, and the like, and may change the rotation mode according to the response of the sensor.

According to a preferred embodiment of the present invention, the rotation mode control unit 108 controls the operation of the spindle motor 124 by using a Constant Linear Velocity (CLV) method when no shock occurs, and when an impact occurs, The operation of the spindle motor 124 is controlled by using a constant angular velocity (CAV) method. In the conventional case, only a narrow-band CLV method is used for a low speed multimedia playback device. However, in the present invention, the CAV method is used together in a situation where a lot of shocks occur.

According to another embodiment of the present invention, the rotation mode control unit 108 controls the operation of the spindle motor 124 using a constant linear velocity (CLV) when no shock occurs, and in the event that an impact occurs Pseudo CLV (Constant Linear Velocity) is used to control the operation of the spindle motor 124. The pseudo CLV method will be described later with a separate drawing.

The spindle motor 124 rotates the disc to be reproduced in accordance with the control information transmitted from the rotation mode control unit 108.

The oscillator 112 generates a clock, and the clock generator 110 divides the clock generated by the oscillator 112 to provide reference clock information suitable for the CAV method or the CLV method to the rotation mode controller.

2 is a block diagram illustrating a detailed configuration of a signal converter according to an exemplary embodiment of the present invention.

As shown in FIG. 2, the signal converter according to an exemplary embodiment of the present invention includes a head amplifier 200 and a data slice unit 204.

The head amplifier 200 amplifies the RF signal transmitted from the optical pickup 122, outputs a focusing servo error signal and a tracking servo error signal, and provides the pickup servo unit 102. The pickup servo unit 102 controls the operation of the optical pickup 122 according to the focusing servo error signal and the tracking servo error signal transmitted from the head amplifier 200.

The data slice unit 204 slices the amplified RF signal output from the head amplifier 200 and converts the amplified RF signal into a square wave signal. The converted square wave signal is input to the synchronization controller 104.

3A is a block diagram illustrating a detailed configuration of a rotation mode controller according to an exemplary embodiment of the present invention.

As shown in FIG. 3A, the rotation mode controller 108 according to an exemplary embodiment of the present invention may include a CLV controller 300, a CAV controller 302, a driving amplifier 304, a rotation speed detector 306, and a switch. 308.

3A illustrates a configuration of a rotation mode controller capable of converting a rotation mode by a user's switch operation.

In FIG. 3A, the CLV controller 300 provides a control signal to the driving amplifier 304 to maintain a constant rate of processing data. Since the CLV method keeps the linear speed of the disk, that is, the speed of processing data, the processing speed of the synchronization signal output from the synchronization controller 104 is compared with the reference signal provided by the clock generator 112 and accordingly. An error signal is generated and provided to the driving amplifier 304.

The CAV control unit 302 provides the drive amplifier 304 with a control signal for maintaining a constant rotational angular velocity of the spindle motor 124. Since the CAV method maintains a constant speed at which the disk rotates, the information about the rotation speed is compared with a reference signal, and an error signal is generated and provided to the driving amplifier 304.

The driving amplifier 304 receives the error signal from the CLV control unit 300 or the CAV control unit 302, and provides the power to the spindle motor 124 in proportion to the magnitude of the error signal to operate the spindle motor 124. To control. If there is no error signal, the drive amplifier 304 operates so that the spindle motor 124 maintains the current speed, and if the error signal is present due to a slow rotation of the spindle motor 124, the driving amplifier 304 is proportional to the error signal. Providing magnitude of power increases the speed of rotation of the spindle motor 124.

The rotational speed detector 306 receives the angular velocity information of the spindle motor and provides the same to the CAV controller 302. Since the CAV control unit 302 controls the angular speed of the spindle motor to be kept constant, it is necessary to receive information about the rotation speed, unlike the CLV control unit 300.

The switch 308 functions to connect either the CLV controller 300 or the CAV controller 302 to the driving amplifier 304 in accordance with the rotation mode selected by the user.

If the user determines that the multimedia playback apparatus is in a place where a lot of impact does not occur, such as a home, the user selects the CLV rotation method, and the switch 308 drives the CLV control unit 300 according to the user's selection information. The drive amplifier unit 304 controls the operation of the spindle motor 124 according to the error signal output from the CLV controller 300.

On the contrary, when the user determines that the multimedia player is in a place where a lot of shock occurs, such as in a car, and selects the CAV rotation method, the switch 308 drives the CAV control unit 300 according to the user's selection information. In connection with 304, the driving amplifier 304 controls the operation of the spindle motor 124 according to an error signal output from the CAV controller 302.

3B is a block diagram illustrating a detailed configuration of a rotation mode controller according to another embodiment of the present invention.

As shown in FIG. 3B, the rotation mode controller 108 according to another embodiment of the present invention may include the CLV controller 300, the CAV controller 302, the driving amplifier 304, the rotation speed detector 306, It may include a switching unit 310 and the sensor 312.

3B illustrates the configuration of the rotation mode controller to detect whether or not a shock occurs and to convert the rotation mode according to the output information of the sensor.

In FIG. 3B, the operation of the remaining components except for the sensor 312 and the switching unit 310 is the same as that of FIG. 3A, and thus description thereof will be omitted.

When the sensor 312 determines that an impact has occurred, the sensor 312 may provide shock generation information to the switching unit 310, and the switching unit 310 may be configured as one of the CLV control unit 300 or the CAV control unit 302 according to the output information of the sensor. One is connected to the driving amplifier 304. The switching unit 310 connects the CAV control unit 302 to the driving amplifier 304 when the shock generation information is output from the sensor (312), otherwise the CLV control unit 300 drives the driving amplifier 304 To.

According to a preferred embodiment of the present invention, the sensor 312 is implemented as an acceleration sensor to detect the degree of impact.

3C is a block diagram illustrating a detailed configuration of a rotation mode controller according to another embodiment of the present invention.

As shown in FIG. 3C, the rotation mode controller according to another embodiment of the present invention may include a CLV controller 300, a CAV controller 302, a driving amplifier 304, a rotation speed detector 306, and a switch ( 310 may include an error detection unit 314.

Figure 3c shows a configuration for converting the rotation mode by detecting whether the impact occurs through the degree of error.

In FIG. 3C, operations of the remaining components except for the error detector 314 are the same as those described with reference to FIGS. 3A and 3B, and thus description thereof will be omitted.

According to a preferred embodiment of the present invention, the error detector 314 is connected to the head amplifier 200 shown in FIG. 2 to determine whether an impact occurs using a focusing servo error signal and a tracking servo error signal output from the head amplifier. do. When the shock occurs, since the focusing servo error and the tracking servo error occur more than normal, it is used to determine whether the shock occurs.

Like the sensor 312 of FIG. 3B, the error detector 314 provides shock generation information to the switching unit 310, and the switching unit 310 controls the CLV control unit 300 according to the output information of the error detection unit 314. Alternatively, any one of the CAV controller 302 is connected to the driving amplifier 304.

3D is a block diagram illustrating a detailed configuration of a rotation mode controller according to another embodiment of the present invention.

As shown in FIG. 3D, the rotation mode controller according to another embodiment of the present invention may include a CLV controller 300, a pseudo CLV controller 316, a driving amplifier 304, a rotation speed detector 306, and a switch ( 308).

FIG. 3D illustrates a configuration in which the rotational speed is controlled by a pseudo CLV (Constant Linear Velocity) rotation method instead of a CAV method in a situation where an impact occurs.

The pseudo CLV method is a rotation control method modified from the conventional CLV method. The conventional CLV method kept the linear velocity constant regardless of the outer or inner circumference of the disc. In contrast, the pseudo CLV method keeps the linear velocity constant only at a specific position of a disc to be played.

For example, the radius of the disk is set to a linear speed between 5 cm and 7 cm, a linear speed between 7 cm and 9 cm in advance, and the rotation of the motor is controlled to maintain a constant linear speed according to the playback position.

When the pseudo CLV method is used, it reacts more insensitive to the impact than when the CLV method is used, and hardware configuration is simpler than that of the CAV method.

When it is determined that the shock is generated, the user sets the switch 308 to operate in the pseudo CLV method, and the pseudo CLV controller 316 is connected to the driving amplifier 304 to output an error signal based on the pseudo CLV method. to provide.

Detailed configuration of the pseudo CLV control unit will be described later with a separate drawing.

Although various embodiments of the rotation mode controller are illustrated in FIGS. 3A to 3D, the modification of the rotation mode controller is not limited to the form illustrated in FIGS. 3A to 3D, and it will be apparent to those skilled in the art that many more modifications are possible. will be. For example, a rotation mode controller including a sensor or an error detector may be implemented while having a pseudo CLV controller.

4 is a block diagram showing a detailed configuration of a CLV control unit according to an embodiment of the present invention.

As shown in FIG. 4, the CLV controller 300 according to an exemplary embodiment of the present invention includes a CLV reference clock receiver 400, a synchronization signal receiver 402, a comparator 404, and an error signal generator 406. ) May be included.

In FIG. 4, the CLV reference clock receiver 400 receives the CLV reference clock provided from the clock generator 110. The clock generator 110 divides a signal generated from the oscillator 112 to generate a CLV reference clock corresponding to a predetermined linear velocity, and the CLV reference clock receiver 400 receives the generated CLV reference clock.

The synchronizing signal receiving unit 402 functions to receive information on the data processing speed of a signal in which the synchronizing output from the synchronizing control unit 104 is matched.

The comparison unit 404 compares the information on the data processing rate received by the synchronization signal receiver 402 with the CLV reference clock received by the CLV reference clock receiver. Since the CLV method keeps the linear speed constant, the CLV reference clock receiver receives clock information corresponding to a constant linear speed, and the comparator 404 compares the CLV reference clock signal with an actual data processing speed to compare two signals. If the speeds do not match, an output signal is generated.

The error signal generator 404 functions to generate an error signal corresponding to the output signal of the comparator and provide it to the driving controller. That is, the error signal generator 404 generates a larger error signal as the difference between the CLV reference clock signal and the actual data processing speed increases. The error signal generator 404 may output an error signal in the form of a current, and the driving controller controls the rotational speed of the spindle motor by amplifying the current at a preset ratio.

5 is a block diagram showing a detailed configuration of a CAV control unit according to an embodiment of the present invention.

As shown in FIG. 5, a CAV controller according to an exemplary embodiment of the present invention includes a CAV reference clock receiver 500, a rotation information receiver 502, a comparator 504, and an error signal generator 506. can do.

In FIG. 5, the CAV reference clock receiver 500 receives a CAV reference clock provided from the clock generator 110. The clock generator 110 divides a signal generated from the oscillator 112 to generate a CAV reference clock corresponding to a predetermined angular velocity, and the CAV reference clock receiver 500 receives the generated CAV reference clock.

The rotation information receiver 502 functions to receive information about the angular speed of the spindle motor output from the rotation speed detector 306.

The comparator 504 compares the angular velocity information of the spindle motor received by the rotation information receiver 502 with the CAV reference clock received by the CAV reference clock receiver 500. Since the CAV method maintains a constant rotational angular velocity of the spindle motor, the CAV reference clock receiver receives clock information corresponding to a constant angular velocity, and the comparator 404 compares the CAV reference clock signal with an actual rotational angular velocity. If not, it generates an output signal.

The error signal generator 404 functions to generate an error signal corresponding to the output signal of the comparator and provide it to the driving controller. That is, the error signal generator 404 generates a larger error signal as the difference between the CAV reference clock signal and the actual rotational angular velocity increases. The error signal generator 404 may output an error signal in the form of a current, and the driving controller controls the rotational speed of the spindle motor by amplifying the current at a preset ratio.

6A is a block diagram illustrating a detailed configuration of a pseudo CLV control unit according to an exemplary embodiment of the present invention.

As shown in FIG. 6A, a pseudo CLV controller according to an exemplary embodiment of the present invention may include a position determiner 600, a first pseudo CLV clock receiver 602, a clock signal modifier 604, and a comparator 606. ), A synchronization signal receiver 608, and an error signal generator 610.

The position determining unit 600 determines the information on the position of the data currently being reproduced in the disc. Since the pseudo CLV method changes the linear velocity in accordance with the reproduction position, the position determination unit generates information on the reproduction position.

According to a preferred embodiment of the present invention, the position determining unit 600 receives information on the reproduction time, which is one of the sub code information, from the demodulation / error correction unit 106, and determines the reproduction position using the received time information. To judge.

According to another embodiment of the present invention, the position determiner 600 may determine the playback position by detecting the position of the optical pickup 122 through a sensor.

Information about the reproduction position output from the position determining unit 600 is input to the clock signal modifying unit 604.

The first pseudo CLV clock receiver 602 receives a pseudo CLV reference clock provided from the clock generator 110. The reference clock provided to the first pseudo CLV clock receiver 602 of FIG. 6A is a clock having a constant rate.

The clock signal converting unit 604 receives the information on the reproduction position from the position determining unit 600 and converts the clock of a constant rate received by the first pseudo CLV clock receiving unit 602 into a clock signal corresponding to the reproduction position. do.

The synchronization signal receiving unit 608 functions to receive information about the data processing speed of the signal in which the synchronization output from the synchronization control unit 104 is matched.

The comparison unit 606 compares the information on the data processing speed received by the synchronization signal receiving unit with the modified clock signal according to the reproduction position output from the clock signal modifying unit 604 and outputs the signal when the two signals are different. Create

The error signal generator 610 generates an error signal corresponding to the output signal of the comparator 606 and provides the error signal to the drive controller, which controls the rotation of the spindle motor according to the error signal.

6B is a block diagram illustrating a detailed configuration of a pseudo CLV control unit according to still another embodiment of the present invention.

As shown in FIG. 6B, a pseudo CLV controller according to another embodiment of the present invention is a synchronization signal receiver 612. The second pseudo CLV reference clock receiver 614, a comparator 616, and an error signal generator 618 may be included.

The pseudo CLV control unit shown in FIG. 6A illustrates a configuration in which the pseudo CLV control unit directly determines position information and controls rotation by modifying a reference clock according to the position information. FIG. 6B illustrates a playback position in the clock generation unit 112. And a pseudo CLV control unit which only generates an error signal with the provided clock.

In FIG. 6B, as in FIG. 6A, the synchronization signal receiving unit 612 receives information about a data processing rate of a signal in synchronization with the synchronization output from the synchronization control unit 104, and the second CLV reference clock receiving unit 614. Receives a pseudo CLV reference clock signal provided by a clock generator. Unlike the first CLV reference clock signal, the second CLV reference clock signal is a clock signal whose rate varies depending on the reproduction position.

The comparator 616 compares the second CLV reference clock signal with the information about the data processing speed received from the sync signal receiver, and generates an output signal when there is a difference. The error signal generator 618 is a comparator ( An error signal corresponding to the output signal of 616 is generated and provided to the driving controller.

7A is a block diagram illustrating a configuration of a clock generator according to an exemplary embodiment of the present invention.

As shown in FIG. 7A, a clock generator according to an embodiment of the present invention may include a CAV reference clock generator 700 and a CLV reference clock generator 702.

7A illustrates a clock generator that provides a reference clock signal to the rotation mode controller illustrated in FIGS. 3A, 3B, and 3C.

In FIG. 7A, the CAV reference clock generator 700 generates a clock signal corresponding to a predetermined rotational angular velocity of the spindle motor and provides the same to the CAV controller, and the CLV reference clock generator 702 generates a predetermined linear speed, that is, data. A clock signal corresponding to the processing speed is generated and provided to the CLV controller.

The CAV reference clock generator 700 and the CLV reference clock generator 702 divide the reference clock generated by the oscillator 112 to generate a CAV reference clock and a CLV reference clock, respectively.

7B is a block diagram showing the configuration of a clock generator according to another embodiment of the present invention.

As shown in FIG. 7B, the clock generator according to another embodiment of the present invention may include a CLV reference block generator 704 and a first pseudo CLV reference clock generator 706.

The clock generator shown in FIG. 7B illustrates the configuration of the clock generator when the pseudo CLV controller of the rotation mode controller of FIG. 3D is implemented as shown in FIG. 6A.

In FIG. 7B, the CLV reference clock generator 704 generates a clock signal corresponding to a predetermined linear speed, that is, a data processing speed, and provides the clock signal to the CLV controller, and the first pseudo CLV reference clock generator 706 is predetermined. A clock signal having a frequency is provided to the pseudo CLV control section, and the pseudo CLV control section transforms the received clock signal according to the reproduction position.

7C is a block diagram illustrating a configuration of a clock generator according to still another embodiment of the present invention.

As shown in FIG. 7C, a clock generator according to another embodiment of the present invention includes a CLV reference clock generator 708, a second pseudo CLV reference clock generator 710, and a position information determiner 712. can do.

The clock generator shown in FIG. 7C illustrates the configuration of the clock generator when the pseudo CLV controller of the rotation mode controller of FIG. 3D is implemented as illustrated in FIG. 6B.

In FIG. 7C, the position determiner 712 determines information about the position of data currently being reproduced in the disc, similarly to the position information determiner of FIG. 6A. As described above, a time provided by the demodulation / error corrector The playback position may be determined by determining the playback position through the information or by determining the position of the optical pickup through the sensor.

The second pseudo CLV reference clock generator 710 generates a CLV reference clock corresponding to the position information output from the position determiner 712. The second pseudo CLV reference clock is changed according to the reproduction position, and the generated reference clock is provided to the pseudo CLV control section.

8 is a flowchart illustrating an operation of a multimedia playback apparatus for reducing impact impact according to a preferred embodiment of the present invention.

FIG. 8 illustrates an operation when the rotation mode controller is implemented as shown in FIG. 3A.

As shown in FIG. 8, the multimedia playback apparatus first receives rotation mode selection information selected by a user (S800).

The user selects the CAV rotation mode where a lot of shock occurs using a switch or a selection button, and selects the CLV rotation mode where there is not much shock.

When the user selects the CAV rotation mode, the switch 308 is adjusted so that the driving amplifier 304 is connected to the CAV controller 302 (S804). 8 illustrates a case in which the switch is adjusted according to the user's selection information. However, it will be apparent to those skilled in the art that the switch may be adjusted by detecting a shock by a sensor or the like.

The CAV controller 302 receives the CAV reference clock from the clock generator 110 (S806), and compares the received CAV reference clock signal with the rotation speed information provided by the rotation speed detector 306 (S808).

As a result of the comparison, when there is a difference between the rotational speed information and the CAV reference clock signal, the CAV controller 302 generates an error signal, and the generated error signal is provided to the driving amplifier 304.

The driving amplifier 304 controls the driving speed of the spindle motor 124 according to the error signal (S812).

When the user selects the CLV rotation mode, the switch 308 is adjusted such that the driving amplifier 304 is connected to the CLV controller 300 (S814).

The CLV controller 300 receives the CLV reference clock signal from the clock generator 110 (S816), and compares the CLV reference clock signal with the synchronization signal provided from the synchronization controller (S818).

As a result of the comparison, if there is a difference between the synchronization signal and the CLV reference clock signal, the CLV controller 300 generates an error signal and provides it to the driving amplifier 304 (S820).

The driving amplifier 304 controls the rotational speed of the spindle motor according to the provided error signal (S822).

9 is a flowchart illustrating an operation of a multimedia playback apparatus for reducing impact impact according to another embodiment of the present invention.

FIG. 9 illustrates an operation when the rotation mode controller is implemented as shown in FIG. 3D.

As shown in FIG. 9, the multimedia playback apparatus first receives rotation mode selection information selected by the user (S900).

The user selects a pseudo CLV rotation mode where a lot of shock occurs using a switch or a selection button, and selects a CLV rotation mode where there is not much shock.

When the user selects the pseudo CLV rotation mode, the switch 308 is adjusted so that the driving amplifier 304 is connected to the pseudo CLV controller 316 (S904). 9 illustrates a case in which the switch is adjusted according to the user's selection information, but it will be apparent to those skilled in the art that the switch may be adjusted by detecting a shock by a sensor or the like.

When the pseudo CLV rotation method is used, the positional information on which the current data is being reproduced on the disk is determined (S906). As described above, the reproduction position of the data may be determined by detecting the time information or the position of the optical pickup.

If the reproduction position is determined, a pseudo CLV reference clock signal corresponding to the reproduction position is generated (S908).

The pseudo CLV control unit 16 compares the pseudo CLV reference clock with the synchronization signal (S910). If there is a difference in the signal, the pseudo CLV controller 16 generates an error signal corresponding to the difference and provides it to the driving amplifier 304 (S912). .

The driving amplifier 304 controls the driving speed of the spindle motor 124 according to the error signal (S914).

Since the operation when the user selects the CLV rotation mode is the same as that of FIG. 8, a detailed description thereof will be omitted.

As described above, according to the multimedia playback apparatus for reducing the impact of the impact according to the present invention, by selectively applying the CAV method and CLV method, or by selectively applying the CLV method and the pseudo CLV method, the impact due to playback during movement Even if it is applied, it reacts insensitive to the impact, there is an advantage that can minimize the playback error due to the impact.

Claims (15)

In the multimedia playback device, An optical pickup for emitting a light beam to the disc to be reproduced and outputting an RF signal corresponding to the reflected wave of the emitted light beam; A signal converter configured to receive an RF signal output by the optical pickup, generate an error check signal for the RF signal, and convert the RF signal into a digital signal; A pickup servo unit receiving an error check signal output from the signal converter and providing control information regarding a focusing direction and a tracking direction of the optical pickup to the optical pickup; A synchronization controller which receives the digital signal output from the signal converter and synchronizes the synchronization with respect to the processing speed of the digital signal; A demodulation / error correction unit for receiving and demodulating the output signal of the synchronization control unit and correcting an error using a predetermined error code; A rotation mode control unit controlling the spindle motor to operate in a CAV rotation mode in a situation where a lot of shocks occur, and controlling the spindle motor to operate in a CLV rotation mode in a situation where a lot of shocks do not occur; And And a clock generator for providing a reference clock signal to the rotation mode controller. The method of claim 1, The signal converter, Amplifying an RF signal transmitted from the optical pickup and slicing an amplified RF signal output from the head amplifier and a head amplifier providing a focusing servo error signal and a tracking servo error signal to the pickup servo unit, and converting the signal into a square wave signal And a data slicing unit for reducing the impact of a multimedia. The method of claim 1, The rotation mode control unit, A CLV control unit for generating an error signal to rotate the disc to be reproduced according to the CLV method; A CAV control unit for generating an error signal to rotate the disc to be reproduced according to the CAV method; A driving amplifier which receives an error signal from either the CLV controller or the CAV controller to control the rotational speed of the spindle motor; A switch for connecting one of the CLV controller or the CAV controller to the driving amplifier according to the rotation mode selection information of the user; And And a rotational speed detector configured to provide rotational speed information of the spindle motor to the CAV controller. The method of claim 1, The rotation mode control unit A CLV control unit for generating an error signal to rotate the disc to be reproduced according to the CLV method; A CAV control unit for generating an error signal to rotate the disc to be reproduced according to the CAV method; A driving amplifier which receives an error signal from either the CLV controller or the CAV controller to control the rotational speed of the spindle motor; A sensor for detecting whether an impact occurs; A switch configured to connect any one of the CLV control unit or the CAV control unit to the driving amplifier unit according to the impact occurrence detection information of the sensor; And And a rotational speed detector configured to provide rotational speed information of the spindle motor to the CAV controller. The method of claim 1, The rotation mode control unit A CLV control unit for generating an error signal to rotate the disc to be reproduced according to the CLV method; A CAV control unit for generating an error signal to rotate the disc to be reproduced according to the CAV method; A driving amplifier which receives an error signal from either the CLV controller or the CAV controller to control the rotational speed of the spindle motor; An error detector for analyzing an error check signal of the signal converter to determine whether an impact occurs; A switch configured to connect any one of the CLV control unit or the CAV control unit to the driving amplifier unit according to shock generation detection information of the error detection unit; And And a rotational speed detector configured to provide rotational speed information of the spindle motor to the CAV controller. The method according to any one of claims 3 to 5, The CLV control unit. A CLV reference clock receiver configured to receive a CLV reference clock signal from the clock generator; A synchronization signal receiving unit which receives a synchronization signal relating to a speed of processing data from the synchronization control unit; A comparison unit comparing the synchronization signal with the CLV reference clock signal and generating an output signal when there is a difference; And an error signal generator for generating an error signal corresponding to an output signal of the comparator and providing the error signal to the driving amplifier. The method according to any one of claims 3 to 5, The CAV control unit, A CAV reference clock receiver for receiving a CAV reference clock signal from the clock generator; A rotation information receiver configured to receive rotation speed information of the spindle motor from the rotation speed detector; A comparison unit comparing the rotational speed information of the spindle motor with the CAV reference clock signal and generating an output signal when there is a difference; And an error signal generator for generating an error signal corresponding to an output signal of the comparator and providing the error signal to the driving amplifier. The method according to claim 6 or 7, The clock generator, A CLV reference clock generator configured to generate a CLV reference clock signal for maintaining a constant processing speed of data; And a CAV reference clock generator for generating a CAV reference clock signal for maintaining a constant rotational angular velocity of the spindle motor. In the multimedia playback device, An optical pickup for emitting a light beam to the disc to be reproduced and outputting an RF signal corresponding to the reflected wave of the emitted light beam; A signal converter configured to receive an RF signal output by the optical pickup, generate an error check signal for the RF signal, and convert the RF signal into a digital signal; A pickup servo unit receiving an error check signal output from the signal converter and providing control information regarding a focusing direction and a tracking direction of the optical pickup to the optical pickup; A synchronization controller which receives the digital signal output from the signal converter and synchronizes the synchronization with respect to the processing speed of the digital signal; A demodulation / error correction unit for receiving and demodulating the output signal of the synchronization control unit and correcting an error using a predetermined error code; Control the spindle motor to operate in the CAV rotation mode in the event of a lot of shock, and control the spindle motor to operate in the pseudo CLV rotation mode of varying data processing speed according to the playback position in the case of no impact. A rotation mode controller; And And a clock generator for providing a reference clock signal to the rotation mode controller. The method of claim 9, The rotation mode control unit A CLV control unit for generating an error signal to rotate the disc to be reproduced according to the CLV method; A pseudo CLV control unit for generating an error signal to rotate a disc to be reproduced according to a pseudo CLV scheme having a different data processing speed depending on the reproduction position; A driving amplifier which receives an error signal from either the CLV controller or the pseudo CLV controller to control a rotational speed of the spindle motor; And And a switch for connecting one of the CLV control unit and the pseudo CLV control unit to the driving amplifier unit according to the rotation mode selection information of the user. The method of claim 10, The pseudo CLV control unit, A position determination unit that determines position information at which data on the disc is reproduced; A clock change unit configured to change and output a pseudo CLV reference clock signal according to output information of the position determiner; A synchronization signal receiving unit which receives a synchronization signal relating to a speed of processing data from the synchronization control unit; A comparison unit comparing the output signal of the clock change unit with the synchronization signal and generating an output signal when there is a difference; And an error signal generator for generating an error signal corresponding to an output signal of the comparator and providing the error signal to the driving amplifier. The method of claim 10, The pseudo CLV control unit, A pseudo CLV reference clock receiver configured to receive a pseudo CLV reference clock signal changed according to the position at which data is reproduced on the disk; A synchronization signal receiving unit which receives a synchronization signal relating to a speed of processing data from the synchronization control unit; A comparison unit comparing the pseudo CLV reference clock signal with the synchronization signal and generating an output signal when there is a difference; And an error signal generator for generating an error signal corresponding to an output signal of the comparator and providing the error signal to the driving amplifier. The method of claim 12, The clock generator, A CLV reference clock generator configured to generate a CLV reference clock signal for maintaining a constant processing speed of data; A position determination unit that determines position information at which data on the disc is reproduced; And a pseudo CLV reference clock generator for generating a pseudo CLV reference clock signal for changing a data processing speed according to the output information of the position determiner. The method of claim 11, The position determining unit, Multimedia playback apparatus for reducing the impact impact, characterized in that for determining the playback position by using the playback time information provided by the demodulation / error correction unit. The method of claim 11, And the position determiner detects a position of the optical pickup to determine a play position.