KR100217698B1 - Optical disk reproducing device - Google Patents

Abstract

The present invention relates to an optical disc reproducing apparatus having an impact resistance function, and is capable of reproducing a video CD, a karaoke CD or a CD-ROM, and also prevents a sound from being caused by an external vibration at the time of reproducing a music CD, The optical disk 11 rotates faster than the standard speed and accumulates the CD-DA signal sequence in the first memory means 18. In this case, The system control means 15 instructs the optical servo means 14 to re-access the track position before the CD-DA signal train is disconnected, and controls the impact resistance control means 19 to detect the track jump or the focus shift, The CD-DA signal sequence of the CD-DA signal sequence is stopped and the accumulation of the CD-DA signal sequence in the first memory means 18 is stopped, and the CD-DA sequence is continuously output from the first memory means 18 at the standard speed , The reproduction from the normal track position is resumed before the accumulation memory disappears. And a signal sequence other than the CD-DA signal sequence is inputted to the second digital signal separating means by controlling the information signal stream branching means 17. [

Description

The optical disc reproducing apparatus

FIG. 1 is a block diagram of an optical disc reproducing apparatus according to a first embodiment of the present invention; FIG.

FIG. 2 is a block diagram of an optical disc reproducing apparatus of the second embodiment; FIG.

FIG. 3 is a block diagram of an optical disc reproducing apparatus of the third embodiment; FIG.

FIG. 4 is a block diagram of an optical disc reproducing apparatus according to a conventional example;

FIG. 5 is a block diagram of another conventional optical disc reproducing apparatus.

DESCRIPTION OF THE REFERENCE NUMERALS

1A, 2A, 3A: second memory means 1B: second digital decoding processing means

1C, 2C, 3C: D / A conversion means 2B: MPEG decoding processing means

3B: CD-ROM decoding processing means 11, 21, 31:

12, 22, 32: spindle motors 13, 23, 33:

14, 24, 34: optical servo means 15, 25, 35: system control means

16: first digital signal processing means 17, 27, 37:

18, 28, 38: first memory means 19, 29, 39:

26, 36: digital signal processing means

The present invention relates to an optical disc reproducing apparatus, and more particularly, to an optical disc reproducing apparatus having an impact function.

2. Description of the Related Art [0002] In recent years, a compact disc (hereinafter abbreviated as CD) player as an optical disc reproducing apparatus has been developed for portable or car audio applications due to its compactness.

The CD player reads a CD-DA signal sequence, which is an audio signal of a digital audio signal, in a noncontact manner by using a focusing servo for focusing the light beam on the digital signal recording surface of the CD or a tracking servo for tracking the light beam on the signal recording track. However, a CD player for portable Donna car audio is more susceptible to external vibration than a fixed CD player, and the sound is cut off due to a focus deviation or a track jump, or a sound is discontinued easy to do. Therefore, in order to prevent this sound from jumping, a CD player equipped with an impact resistance control means for reproducing the CD-DA signal sequence at a standard speed while storing the CD-DA signal sequence in the memory while rotating the CD at double speed is put into practical use.

On the other hand, a video CD player capable of playing a CD-ROM XA-compliant video CD or a karaoke CD in which a music CD player MPEG (Motion Picture Coding Experts Group excluded) Is being commercialized.

In addition, there is an increasing opportunity to use CD-ROM as a medium for providing application software and data or various utility software for a disk top personal computer or a notebook personal computer, and a CD-ROM decoding function Has attracted attention. In addition, a model capable of reproducing stereo music and HiFi sound effects by incorporating a stereo speaker in a personal computer has also been commercialized.

An optical disc reproducing apparatus using a conventional CD will be described below with reference to the drawings.

FIG. 4 is a block diagram of a conventional optical disc reproducing apparatus, and more particularly, a block diagram of a CD player equipped with an impact resistance function. In FIG. 4, a CD 41, which is an optical disk, is fixed by being fixed to a spindle motor 42 capable of rotating at a speed twice faster than a standard speed, for example, One of the outputs of the optical pickup 43 is inputted to the optical servo means 44 and servo control of the spindle motor 42 and the optical pickup 43 is performed. The other side of the output of the optical pickup 43 is input to the digital signal processing means 46, which demodulates the digital signal sequence at double speed and converts it into control information, subcode information and double-speed CD-DA signal sequence. The system control means 45 reads control information and subcode information output from the digital signal processing means 46 and detects a track jump or a focus deviation. The shock resistance control means 48 receives the CD-DA signal sequence at double speed and converts it into a standard speed while accumulating it in the memory means 47 and outputs it to a digital-analog (hereinafter abbreviated as D / A) DA signal sequence into an audio signal.

Hereinafter, the operation of the conventional optical disc reproducing apparatus constructed as described above will be described. First, when the music CD 41 is reproduced at double speed, the digital signal processing means 46 starts demodulation processing of the digital signal sequence at double speed to output subcode information, control information, or a double-speed CD-DA signal sequence . Next, the impact resistance control means 48 inputs the double-speed CD-DA signal train and stores it in the memory means 47, and outputs the CD-DA signal train of the standard speed at the same time. The D / A conversion means 49 receives the standard speed CD-DA signal sequence and converts it into an analog audio signal.

On the other hand, the system control means 45 monitors the track jump and the focus deviation while inputting the subcode information and the control information outputted by the digital signal processing means 46, and when the abnormality occurs, the optical servo means 44 to control the spindle motor 42 to start access again, move the optical pickup 43 to a track position before the position at which the anomaly occurred, and perform sub-control of the spindle motor 42. In addition, an abnormality generation command is output to the impact resistance control means 48. When the shock control means 48 receives an abnormality generation command from the system control means 45, the double-speed CD-DA signal sequence stops inputting, stops accumulation in the memory means 47, The CD-DA signal sequence is continuously outputted from the memory means 47 so that music is not interrupted. That is, even if a new CD-DA signal sequence is not inputted, the music is not cut off for a time period of the standard speed accumulated in the memory means 47. The system control means 45 gives a normal return command to the impact resistance control means 48 and the impact resistance control means 45 issues a normal return command to the impact resistance control means 48, The input of the CD-DA signal train is resumed and accumulation in the memory means 47 is started.

FIG. 5 is a block diagram of a video CD player incorporating an MPEG decoding function, which is another conventional example.

5, one of the outputs of the optical pickup 53 that reads data from the optical disc 51 such as a music CD, a video CD, or a karaoke CD rotated by the spindle motor 52 is supplied to the optical servo unit 54, And performs servo control of the timing pin motor 52 and the optical pickup 53. The other side of the output of the optical pickup 53 is input to the digital signal processing means 56 where it demodulates the digital signal stream and converts it into subcode information and control information and a CD-DA signal stream or MPEG signal stream. The system control means 55 reads the subcode information and the control information output from the digital signal processing means 56 to determine whether it is a music CD, a video CD, or a karaoke CD, detects a track jump or a focus deviation do.

The information signal sequence branching means 57 branches the input from the digital signal processing means 56 into the CD-DA signal stream of the music CD and the MPEG signal stream of the video CD or the karaoke CD under the control of the system control means 55, The former is outputted to the D / A conversion means 5A and the latter is outputted to the MPEG decoding processing means 59. [ The MPEG decoding processing means 59 extracts the MPEG signal string accumulated at the same time while accumulating the inputted MPEG signal string in the memory means 58 once and decodes it in real time and converts it into a digital video signal string or a digital audio signal string Output.

The D / A conversion means 5A converts a digital video signal string or a digital audio signal string into an analog video signal or an audio signal.

Hereinafter, the operation of the optical disc reproducing apparatus according to the related art will be described. When the optical disc 51, which is a music CD, is first reproduced, the digital signal processing means 56 starts the demodulation process of the digital signal sequence and outputs the subcode information, the control information or the CD-DA signal sequence. The system control means 55 monitors the track jump or the focus deviation by using the subcode information and the control information. If there is an abnormality, the system control means 55 issues an instruction to the optical servo means 54 to instruct the optical pickup 53 and the spindle motor (52). On the other hand, the information-signal-train branching unit 57 branches the CD-DA signal sequence output from the digital signal processing unit 56 and inputs it to the D / A conversion unit 5A. The D / A conversion means 5A converts the CD-DA signal string into an audio signal and outputs it.

Next, when the optical disc 51, which is a video CD or a karaoke CD, is reproduced, the digital signal processing means 56 starts the demodulation process of the digital signal stream and outputs the subcode information, the control information and the MPEG signal sequence. The system control means 55 monitors the track jump or the focus deviation by using the subcode information and the control information. If there is an abnormality, the system control means 55 issues an instruction to the optical servo means 54 to instruct the optical pickup 53 and the spindle motor (52). On the other hand, the information signal sequence branching unit 57 branches the MPEG signal sequence and inputs it to the MPEG decoding processing unit 59. [

The MPEG decoding processing means 59 decodes the MPEG signal stream in real time while using the memory means 58 as a buffer memory and converts it into a digital video signal stream or a digital audio signal stream at predetermined time intervals and outputs it. The D / A conversion means 5A receives the digital video signal string or the digital audio signal string and converts it into an analog video signal or an audio signal.

However, in the configuration of the conventional example as described above, the CD player initially exemplified by using Fig. 4 is equipped with an impact resistance function, but since the CD player does not have an MPEG decoding function, it is difficult to reproduce a video CD or a karaoke CD . In the other conventional example according to FIG. 5, it is not possible to reproduce a video CD or a karaoke CD. However, when a music CD is reproduced, the seismic performance is bad because the shock resistance function, The effect of appeal was low.

The present invention solves the above-mentioned problems of the conventional art, and it is an object of the present invention to provide a sound reproducing apparatus capable of reproducing a video CD, a karaoke CD or a CD-ROM in addition to a music CD, And to provide an optical disc reproducing apparatus capable of preventing an optical disc from being reproduced.

According to an aspect of the present invention, there is provided an optical disc reproducing apparatus comprising: a spin-stone motor for holding and rotating an optical disc by rotation; a light source for focusing a light beam on a data recording surface of the optical disc and reading a digital signal recorded on the optical disc A first digital signal processing means for demodulating a digital signal output from the optical pickup, an optical servo means for performing rotation control of the spindle motor and optical control of the optical pickup, DA code, which is a basic format of the CD, or a signal sequence other than the CD-DA signal sequence, and outputs an identification command And when the CD-DA signal sequence is identified, the spindle motor is rotated at a speed faster than the standard speed Wherein the first digital signal processing means demodulates the high-speed CD-DA signal stream and outputs an abnormality generation command when an abnormality occurs in the output from the first digital signal processing means, System control means for controlling the optical servo means to access the optical pickup immediately before the occurrence of an error and outputting a normal return command when the output from the first digital signal processing means returns to the state before the occurrence of the error; An information signal sequence branching unit for branching the CD-DA signal sequence output from the first digital signal processing unit and a signal sequence other than the CD-DA sequence, by an identification command of the system control unit; -DA signal sequence is discriminated, the high-speed CD-DA signal sequence branched by the information signal sequence branching means is inputted DA signal train of the standard speed while accumulating the CD-DA signal train in the first memory means and outputting the CD-DA signal train of the standard speed while accumulating the CD-DA signal train in the first memory means by an abnormality generation command of the system control means, An impact resistance control means for resuming accumulation in the first memory means by a normal return command of the system control means; and a control means for, when the system control means identifies a signal train other than the CD-DA signal train, Second digital signal processing means for inputting a signal sequence other than the CD-DA signal sequence branched by the signal sequence branching means, converting the signal sequence into a digital decoding signal sequence in real time while using the second memory means as a buffer memory, The CD-DA signal sequence output from the control means or the digital decoding signal sequence output from the second digital signal processing means It is in a configuration having a-analog converting means to convert the digital signal to analog.

When the signal sequence other than the CD-DA signal sequence is an MPEG signal sequence, the second digital signal processing means may be replaced by MPEG decoding processing means. In addition, a signal sequence other than the CD- In the case of the heat, the spindle motor is driven to rotate faster than the standard speed to output a high-speed CD-DA signal stream from the first digital signal processing means, .

According to the present invention, it is possible to reproduce a video CD, a karaoke CD or a CD-ROM in addition to a music CD by a small additional circuit, and at the time of reproduction of a music CD, The motor is rotated faster than the standard speed to output a high-speed CD-DA signal sequence from the first digital signal processing means, the first memory means is stored as a buffer by the shock resistance control means, and a sound- An impact resistance function for outputting the CD-DA signal train at the standard speed from the first memory means operates until the access of the optical pickup is recovered, thereby enhancing the earthquake-proof performance for the portable digital audio application.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1, which is a block diagram of the optical disc reproducing apparatus of the first embodiment, the spindle motor 12 fixes and rotates the optical disc 11, which is a music CD or other CD mounted thereon. The optical pickup 13 reads a digital signal sequence from the optical disc 11. [ The optical servo means 14 receives one of the digital signal strings read by the optical pickup 13 and performs servo control of the spindle motor 12 and the optical pickup 13. [ The first digital signal processing means 16 inputs the other side of the digital signal sequence read by the optical fingering 13 and demodulates the digital signal to generate subcode information, control information, CD-DA signal sequence, Into a signal sequence. The system control means 15 reads the subcode information and the control information output from the first digital signal processing means 16, identifies whether it is a music CD or other CD, A system abnormality such as deviation is detected. The information signal sequence branching unit 17 branches the input signal into the CD-DA signal sequence of the music CD and other signal sequences.

The high-speed CD-DA signal sequence is inputted from the information signal sequence branching means 17 and stored in the first memory means 18 while reading the accumulated data, and the high-speed CD- And outputs it. The second digital signal processing means 1B receives a signal sequence other than the CD-DA signal sequence of the music CD from the information signal sequence branching means 17, stores it in the second memory means 1A, decodes it, decodes it in real time , And converts it into a digital decoded signal sequence every predetermined time and outputs it. The D / A conversion means 1C converts the CD-DA signal sequence from the impact resistance control means 19 and the digital decoding signal sequence from the second digital signal processing means 1B into an analog audio signal or a video signal.

The operation of the optical disc reproducing apparatus of the first embodiment configured as described above will be described below. First, when the optical disc 11, which is a music CD, is reproduced, the first digital signal processing means 16 starts demodulation processing of the digital signal and outputs control information and subcode information.

When the control information and the subcode information are read and the CD-DA signal sequence is identified, the system control means 15 controls the optical servo means so as to move the spindle motor 12 faster than the standard speed, for example, 2 And the system abnormality such as track jumping and focus deviation is monitored so that a command to the optical servo means 14 is issued to control the optical pickup 13 and the spindle motor 12 . The first digital signal processing means 16 demodulates the high-speed digital signal output from the optical pickup 13 and converts it into a high-speed CD-DA signal stream. The information-signal-train branching means 17 branches the high-speed CD-DA signal train to the shock resistance control means 19 under the control of the system control means 15. On the other hand, the shock resistance control means 19 reads the high-speed CD-DA signal sequence from the first input data, accumulates it in the first memory means 18, And outputs it. The D / A conversion means (IC) converts the CD-DA signal stream of the standard speed into an analog audio signal and outputs it.

Here, when the system control means 15 detects a system abnormality such as a track jump or a focus deviation, immediately after controlling the optical servo means 14, the access to the track position before the CD-DA signal sequence is stopped is started again , And outputs an abnormality occurrence command to the impact resistance control means (19). When receiving the abnormality command, the shock control means 19 suspends the input of the high-speed CD-DA signal train from the information signal train branching means 17 and stops accumulation in the first memory means 18, The CD-DA signal sequence of the first memory means 18 is continuously output from the first memory means 18 so that the music is not interrupted. That is, even if a new CD-DA signal sequence is not inputted, the reproduced music is not interrupted for a time period of the standard speed accumulated in the first memory means 18. When the reproduction from the normal track position is resumed within this time again, the system control means 15 gives a normal return command to the shock-resistant control means 19, while the shock- The input of the high-speed CD-DA signal train from the signal-train branching means 17 is resumed and accumulation in the first memory means 18 is started.

Next, when the optical disc 11, which is a CD other than the music CD, is reproduced, the first digital signal processing means 16 starts the demodulation process of the digital signal stream and outputs control information and subcode information. The system control means 15 reads control information and subcode information, identifies a signal train other than a CD-DA signal train, and monitors system anomalies such as track jump and focus deviation, (14) to control the return of the optical pickup (13) and the spindle motor (12). On the other hand, under the control of the system control means 15, the information signal train branching means 17 branches the signal train other than the CD-DA signal train and inputs it to the second digital signal processing means 1B. The second digital signal processing means 1B decodes the signal streams other than the CD-DA signal stream in real time while using the second memory means 1A as a buffer memory, and converts and outputs the digital decoded signal sequence. The D / A conversion means 1C receives this digital decoded signal sequence and converts it into an analog signal.

As described above, according to the present embodiment, there is provided an optical pickup apparatus 10 that includes a spindle motor 12 for mounting and rotating the optical disc 11 and rotating the optical disc 11, an optical pickup 11 for reading the digital signal modulated and recorded on the optical disc 11, An optical servo means 14 for performing rotation control of the spindle motor 12 and optical control of the optical pickup 13 and a first digital signal 13 for demodulating the digital signal output from the optical pickup 13, The control means 16 inputs the control information and the subcode information output from the first digital signal processing means 16 to control the optical servo means 14 and also controls the CD 11, (CD-DA) signal sequence outputted from the first digital signal processing means (16) and a signal sequence other than the CD-DA signal sequence outputted from the first digital signal processing means (16) Which is branched by the identification command of the system control means (15) When the heat branching means 17 and the system control means 15 identify the CD-DA signal train, the timing pin motor 12 is driven to rotate at a speed higher than the standard speed so that the first digital signal processing means 16 A high-speed CD-DA signal stream is branched and the high-speed CD-DA signal stream branched by the information signal stream branching means 17 is input and stored in the first memory means 18, DA signal sequence other than the CD-DA signal sequence branched by the information signal sequence branching means 17 when the system control means 15 identifies a signal sequence other than the CD- A second digital signal processing means 1B for outputting a digital decoded signal sequence in real time while using the second memory means 1A as a buffer memory and a CD- DA signal or the second digital signal processing means 1B (CD), a karaoke CD, or a CD-ROM (CD-ROM) in addition to music (CDs) by installing a digital-analog conversion means (IC) At the time of reproduction of the music CD, the shock resistance function is activated to prevent the sound from jumping out due to the external vibration, and it is possible to realize the seismic performance suitable for the portable audio application. In addition, it is possible to play a music CD, a video CD, a karaoke CD, and the like in a CD-ROM drive for a personal computer, and it is possible to enjoy music and karaoke by a stereo speaker built in a personal computer body, In a disc play of the personal computer.

Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. 2, an optical pickup 21 for reading data from an optical disc 21 such as a music CD, a video CD, or a karaoke CD rotated by a spindle motor 22 rotatable at a speed higher than the standard speed, for example, One of the outputs of the optical system 23 is input to the optical servo means 24. [ The system control means 25, the digital signal processing means 26, the information signal heat branching means 27, the first memory means 28, the shock resistance control means 29, the second memory means 2A, the D / The structure of the means 2C and the like is the same as that of the first embodiment. The difference from the structure of Fig. 1 is that the second digital signal processing means 19 of Fig. 1 is replaced by the MPEG decoding processing means 29, This makes it possible to process MPEG signal streams such as video CDs and karaoke CDs as signal sequences other than music CD-DA signal sequences.

The operation of the optical disk reproducing apparatus of the second embodiment of the present invention configured as described above will be described below. First, in the case where the optical disc 21, which is a music CD, is reproduced, it is the same as the operation described in the first embodiment of the present invention in FIG. 1, and the description will be omitted.

Next, when the optical disc 21, which is a video CD or a karaoke CD, is reproduced, the digital signal processing means 26 receiving the output of the optical pickup 23 starts demodulating the digital signal to output control information or subcode information do. The system control means 25 reads the control information and the subcode information, identifies the MPEG signal sequence, and monitors the system abnormality such as track jumping and focus deviation, And controls the return of the optical pickup 23 and the spindle motor 22. [ On the other hand, the information signal sequence branching means 27 branches the MPEG signal sequence under the control of the system control means 25 and inputs it to the MPEG decoding processing means 28. The MPEG decoding processing means 2B decodes the MPEG signal stream in real time while using the second memory means 2A as a buffer memory and converts it into a digital video signal string or a digital audio signal string at predetermined time intervals and outputs it. The D / A conversion means 2C receives the digital video signal string or digital audio signal string and converts it into an analog video signal or an audio signal.

As described above, according to the second embodiment of the present invention, when the signal sequence other than the CD-DA signal sequence of the music CD is the MPEG signal sequence, the second digital signal processing means 1B in the first embodiment of the present invention, It is possible to simplify the circuit configuration of the decoding processing means by providing the MPEG decoding processing means 2B instead of the MPEG decoding processing means 2B, An inexpensive portable video CD player or a car video CD player.

Hereinafter, a third embodiment of the present invention will be described with reference to the drawings. 3, reference numeral 31 denotes an optical disk, which is a music CD or a CD-ROM. A spindle motor 32, an optical pickup 33, an optical servo means 34, a system control means 35, a digital signal processing means 36, an information signal heat branching means 37, a first memory means 38, The configuration of the impact resistance control means 39, the second memory means 3A and the D / A conversion means 3C is the same as that of the first embodiment, but the second digital signal processing means 1B is replaced by the CD-ROM decoding processing means 38, whereby a signal sequence other than the music CD-DA signal sequence can process the CD-DA signal sequence.

The operation of the optical disk reproducing apparatus of the third embodiment of the present invention configured as described above will be described below. First, in the case where the optical disc 31, which is a music CD, is reproduced, it is the same as the operation described in the first embodiment of the present invention in FIG. 1, and the description will be omitted. Next, when the optical disc 31, which is a CD-ROM, is reproduced, the digital signal processing means 36 starts demodulation processing of the digital signal and outputs control information and subcode information. When the control information and the subcode information are read and the CD-ROM signal sequence is identified, the system control means 35 drives the spindle motor 32 to rotate at a speed higher than the standard speed, and at the same time, The system abnormality is monitored, and if there is an abnormality in these, an instruction is given to the optical servo means 34 to perform the return control of the optical pickup 33 and the spindle motor 32. On the other hand, the information-signal-train branching means 37 branches the high-speed CD-ROM signal train under the control of the system control means 35 and inputs it to the CD-ROM decoding processing means 3B. The CD-ROM decoding processing means 3B decodes a high-speed CD-ROM signal stream in real time while using the second memory means 3A as a buffer memory, converts it into a CD-ROM data signal string, and outputs it.

As described above, according to the third embodiment of the present invention, when the signal train other than the CD-DA signal train of the music CD is the CD-ROM signal train, the second digital signal processing in the first embodiment of the present invention By providing the CD-ROM decoding processing means 3B instead of the means 1B, it is possible to greatly simplify the circuit configuration of the decoding processing means, and at the same time, when the music CD is reproduced, It is possible to provide a CD-ROM drive compatible with inexpensive music CD playback that prevents a pop-up phenomenon, and particularly excellent additional functions in a personal computer with a built-in stereo speaker.

Although the number of rotations of the spindle motor is two times that of the standard speed in the above embodiments, this is not limited to two times, but may be set at an arbitrary magnification. In addition, the first memory means 18, (28) and (38) approaches the limit, it is necessary to return to the standard speed.

The processing methods included in the first to third embodiments are not limited to those shown in the respective embodiments, and the processing methods included in the respective embodiments may be used in combination.

Needless to say, the present invention can be applied to a reproducing portion of an optical disc apparatus capable of recording and reproducing.

As described above, the optical disc apparatus according to the present invention comprises: a spindle motor for holding and driving the optical disc by rotation; an optical pickup for reading a digital signal recorded on the optical disc by focusing a light beam on a data recording surface of the optical disc; An optical servo means for performing rotation control of the spindle motor and optical control of the optical pickup; and control information and control information output from the first digital signal processing means, Information is input to control the optical servo means and identifies whether it is a CD-DA signal sequence which is the basic format of the CD or a signal sequence other than the CD-DA signal sequence, issues an identification command, and identifies the CD- , The spindle motor is driven to rotate at a speed higher than the standard speed so that the first digital signal processing means generates the high-speed CD-DA signal And outputs an abnormality generation command when an abnormality occurs in the output from the first digital signal processing means and controls the optical servo means in response to the abnormality generation command to access the optical pickup at the position just before the occurrence of the abnormality System control means for outputting a normal return command when the output from the first digital signal processing means returns to the state before the occurrence of the error; When the system control means identifies the CD-DA signal sequence, the high-speed CD-DA signal sequence branched by the information signal sequence branching means is divided by the command signal sequence branching means DA signal train of standard speed while accumulating in the first memory means and outputs the CD-DA signal train, -DA signal train to the first memory means and resumes the accumulation in the first memory means by the normal return instruction of the system control means; A signal sequence other than the CD-DA signal sequence branched by the information signal sequence branching means is inputted by the instruction, and the second memory means is converted into a digital decoding signal sequence in real time while using the second memory means as a buffer memory, 2 digital signal processing means, and a digital-analog conversion means for inputting a CD-DA signal sequence output from the impact resistance control means or a digital decoding signal sequence output from the second digital signal processing means and converting the digital-analog conversion means into an analog signal Have.

Therefore, it is possible to reproduce a CD in a different format such as a video CD, a karaoke CD, or a CD-ROM in addition to a music CD, and at the time of reproduction of a music CD, a shock- So that it is possible to realize an earthquake-proof performance suitable for portable Donna car audio applications.

In addition, it is possible to play a music CD, a video CD, a karaoke CD, and the like in a CD-ROM drive for a personal computer, and it is possible to enjoy music and karaoke by a stereo speaker built in a personal computer body, May be viewed on a personal computer.

In the case where the signal sequence other than the CD-DA signal sequence of the music CD is the MPEG signal sequence, by providing the MPEG decoding processing means in place of the second digital signal processing means, the circuit configuration of the decoding processing means can be simplified, It is possible to provide an inexpensive portable video CD player, a car video CD player, and the like that can prevent the sound from being jammed by the external vibration by operating the impact resistance function when the music CD is reproduced.

In the case where the signal sequence other than the music CD or the CD-DA signal sequence is a CD-DA signal sequence, the CD-ROM decoding processing means is provided instead of the second digital signal processing means, It is possible to provide a CD-ROM drive compatible with music CD playback, which is capable of simplifying the audio CD playback and preventing the sound from jumping out due to the external vibration by operating the shockproof function at the time of music CD playback, It is possible to realize an excellent additional function.

Claims (3)

An optical pickup for focusing a light beam on a data recording surface of the optical disk and reading a digital signal recorded on the optical disk; and a demodulator for demodulating a digital signal output from the optical pickup, Optical servo means for performing rotation control of the spindle motor and optical control of the optical pickup and control information and subcode information output from the first digital signal processing means are input to the optical pickup, The CD-DA signal sequence is identified by identifying the CD-DA signal sequence as a basic format of the CD or a signal sequence other than the CD-DA sequence, Is driven to rotate faster than a standard speed so that a high-speed CD-DA signal train is generated in the first digital signal processing means And outputs an abnormality generation command when the abnormality occurs in the output from the first digital signal processing means and controls the optical servo means in response to the abnormality generation command to output the optical pickup System control means for outputting a normal return command when the output from the first digital signal processing means returns to a state before the occurrence of an error; An information signal sequence branching section for branching a signal sequence other than the CD-DA sequence, by means of an identification command of the system control section; and a control section for, when the system control section has identified the CD- To the CD-DA signal sequence at the standard speed while storing the CD-DA signal sequence in the first memory means DA signal line to the first memory means in response to an abnormality generation command of the system control means while stopping the accumulation of the CD-DA signal string in the first memory means, And a signal sequence other than the CD-DA signal sequence branched by the information signal sequence branching means in response to the command, when the system control means has identified a signal sequence other than the CD- Second digital signal processing means for converting the digital signal to a digital decoded signal sequence in real time while using the second memory means as a buffer memory and for outputting the CD-DA signal sequence output from the impact resistance control means, A digital-analog conversion means for inputting the digital decoded signal sequence output from the signal processing means and converting it into an analog signal, The optical disk reproducing apparatus, characterized in that. The optical disc reproducing apparatus according to claim 1, wherein the signal sequence other than the CD-DA signal sequence is an MPEG signal sequence and MPEG decoding processing means is provided instead of the second digital signal processing means. 2. The method of claim 1, wherein the signal train other than the CD-DA signal train is a CD-ROM signal train and the spindle motor is driven to rotate faster than the standard speed to output a high-speed CD-ROM signal train from the first digital signal processing means, And a CD-ROM decoding processing means in place of the digital signal processing means.