MXPA97000671A - Device and method for the detection of dis - Google Patents

Abstract

The present invention relates to an optical disc player apparatus having CD and DVD playback systems containing their respective synchronous signals. The systems have synchronous detectors respectively, and analyze a synchronous output signal from the synchronous detectors when it is detected that a disk is mounted. The CD playback system is selectively driven when a synchronous CD signal is detected, to perform a CD playback mode, and the DVD playback system is selectively driven when a synchronous DVD signal is detected, to perform a mode of reproduction of D

Description

DEVICE AND METHOD FOR THE DETECTION OF DISCS BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for the reproduction of disks and, more particularly, to a device and a method for automatically detecting the types of disks mounted in an apparatus for the reproduction of a plurality of disks.

Description of the related technique In general, what represents optical discs that perform non-contact reading through the use of laser beam is a compact disc (hereinafter referred to as CD). However, for the disk recording / playback apparatus, more and more, higher speed, higher capacity is required? Writing and greater density (greater capacity). Meanwhile, for compression technology and digital video, MPEG (Group of Experts in Motion Images) has become more use REF: 23791 practical. Accordingly, digital motion image disc media, such as a digital video disc (DVD) will emerge as the central means of multi media (multimedia) storage. Figure 1 is a block diagram of a DVD player. In this figure the disc 20 is a high density optical disk, which can be DVD in this case. The feedback unit D is a short wave optical head. It is assumed that the numerical aperture is 0.6, and that the semiconductor laser wavelength, red, is used. The signal amplifier 112 amplifies a light output signal coming from the unit? catcher 111, after converting it to an electrical signal. The demodulator / decoder or ECC 113 demodulates the moined output signal from the signal amplifier 112, and corrects the error produced during playback. The servo controller 114 receives the output (focus and tracking error signal) of the signal amplifier 112 and the output (constant linear velocity control signal) of the. modulator / decoder? or ECC 113 in order to control the pick-up unit 111. The decoding system? 116? selects the output of the DVD data stream from the ECC demodulator / decoder 113 , being divi? i? a the current in the video data stream (elementary) and in the audio data stream (elementary). The video decoder 117 decodes the current output of the video data from the decoder or the system 117, so that it is converted to the form of reproducible video data. The encoder 118 encodes the video data output from the video decoder 117, to a corresponding video display mode (NTSC or PAL), and then sends them to a screen. The audio decoder 119 converts the encoded audio data stream and sends it out from the decoder of the system 116 to the original data. The D / A converter 120 converts the data output from the audio decoder 119 to an analog audio signal. In Fig. 1, the system controller for controlling the complete operation of the disc reproduction apparatus is not shown. The DVD player built as mentioned above uses modulation, error correction and video encoding different from those of a general CD player, so its signal processing is completely different. The size of the depression and the pitch of the DVD and CD groove are different, and their laser wavelength of the pickup unit 111 and the numerical aperture of the objective lens are different. In the DVD recording / playback apparatus, is it important to reduce the size of the focus light spot for higher density purposes? For this, firstly, the wavelength of the laser becomes shorter, secondly, the numerical aperture of the objective lens becomes larger, and thirdly, a modulation having excellent coding efficiency is used. A) Yes, for the DVD the wavelength of the laser is 650-635 nm of the red semiconductor laser, the numerical aperture of the objective lens is 0.6, and it is used for the EFM-mas modulation (Modulation Eight to Fourteen more). In order to reproduce the information coming from the high density optical disk ?, the capture unit 111 must be able to form a small luminous point of focus. The diameter of the focal point of light is proportional to the wavelength? of light, and inversely proportional to the numerical aperture of the objective lens, as shown in FIG. 2. To date the lower limit of the wavelength of the semiconductor laser is approximately 635 nm, as described above. Generally speaking, the DVD uses 650 nm of laser wavelength as its standard, being the CD of 780 nm of laser wavelength. The numerical aperture of the DVD is 0.6, and that of the CD is 0.45, so that the diameter of the DVD of the focal point of light becomes greater than approximately 60% of the CD. So the DVD can get a playback signal equal to that of the CD, approximately 2.6 times the density? ? e recording? the CD. The DVD improves the waveform of the reproduction signal through the processing of the effective circuit, so that it has a recording capacity approximately 4.2 times that of the CD. The characteristics of the DVD and CD are shown in the following table 1.

«TABLE 1 > > In table 1, the CD and the DVD of the same disk diameter have many differences. However, its compatibility is very important because the CD has a huge amount of little contrasting resources. The primary impedance in compatibility between DVD and CD is to use a separate optical pickup. In other words, in order to reproduce the information on the disk, part of the optical system is formed according to the thickness of the disk. For this reason, the objective lens is designed according to the thickness of the disc. If the thickness of the disc deviates from the designated value, spherical aberration occurs, and the convergence of the optical focus is? Reduced. More specifically, DVD is 0.6 mm thick, while the CD is 1.2 mm thick, so that the two types of discs can not be reproduced with one attached? ? e simple uptake. For their compatibility, separate optical pickup units must be used. In order to overcome such problem, the double-focus optical unit for the CD and the DVD was suggested. In the optical pickup unit shown in Figure 4, the optical focus for DVD and the optical focus for CD are separated by a predetermined distance in the direction of the optical axis. This solves the problem caused by the difference in thickness of the disc. The principle of the optical pickup of? Oble focus, oyster? In Figure 4, is to overlap the operations of two types of lenses by using a hologram. The numerical aperture of the objective lens of the optical pickup is 0.6, in accordance with DVD standards, and a hologram is provided to identify part of its central light as if the lens will diffract it. The light is not diffracted by the hologram to be converged by the objective lens, whose numerical aperture is 0.6, to form with this the optical focus of the DVD. The diffracted light forms a hologram that is appropriate for the numerical aperture of 0.4 of the hologram, and the objective lens and CD of 1.2 mm in thickness. In the case of the optical pickup shown in Figure 4, the optical focus for CD is formed further than that for DVD. Here, the photodetector is positioned so that the reflection image - the optical focus converged on the disk, is formed on it. If the DVD is played, the DVD optical focus is converged on the disc, and the optical focus for CD is diverted, so that the image becomes unclear. The image of the optical focus for DVD is formed on the photodetector, but the reflection light in the optical focus for CD is widely dispersed so as not to give external impacts on the reproduction of the DVD. The reverse operation is performed in the CD playback. In the case of a system that has a pickup capable of playing the DVD and the CD or captures capable of independently reproducing DVDs and CDs, it should be operated in a corresponding mode by detecting the type of disc inserted. DVD and CD discrimination can be implemented in several ways: to compare the sizes of the focus error detection signals reproduced by the optical pickup; or to compare the sizes of the RF signals with the size of the depression. Furthermore, a method for the detection of the type of disk mounted by using the synchronous pattern is suggested. This can be achieved by analyzing the synchronization code detected in a specific mode, because CD and DVD use their respective synchronization code patterns.

BRIEF DESCRIPTION OF THE INVENTION In order to overcome such disadvantages of the prior art, an object of the present invention is to provide a device and method for automatically detecting the types of disc mounted in a system to reproduce multiple types of discs. Still another object of the present invention is to provide a device and method for detecting and analyzing the synchronous pattern of a mounted disk, after a CD mode is initially set in a system for DVD and CD playback, to detect with this the type of disc mounted, and also to automatically perform the corresponding playback mode of the disc, according to the result of discrimination . Yet another object of the present invention is to provide a "device and method for the detection and analysis of the synchronous pattern of a mounted disk," which is then initially set or a "DVD" in a system for repro DVD and CD ucción, to detect with this the type of the mounted disc, and also automatically perform the corresponding playback mode of the disc, according to the result of discrimination. Still another object of the present invention is to provide a device and a method for detecting and analyzing the synchronous pattern of a disk mounted in a satellite playback system having synchronous CD and DVD detectors, thereby detecting the mounted disk, and also automatically perform the corresponding mode of disc playback according to the result of discrimination.

To achieve the objects of the present invention, there is provided an optical disc reproducing apparatus having CD and DVD playback systems, which contain their respective synchronous signals, the CD and DVD playback systems have respectively synchronous detectors, the systems that analyze a synchronous output signal coming from the? synchronous ettectors when a disc is detected, the CD playback system being selectively activated when a synchronous signal is detected from the CD, to perform a reprojection mode? e CD, the DVD playback system is selectively activated when a synchronous DVD signal is detected to perform a DVD playback mode. In still another aspect, an optical disc reproducing apparatus having CD and DVD playback systems, containing their respective synchronous signals, is provided, the CD playback system having a CD synchronous detector, said system analyzing whether a signal The synchronous CD output from the CD synchronous detector is detected or not detected when a disc is mounted, the CD playback system being selectively operated when it is detected that the CD's synchronous signal performs a CD playback mode. CD, the DVD playback system is selectively triggered when the synchronous CD signal is not detected for a predetermined time, to perform a DVD playback. In still another aspect, an optical disc reproducing apparatus having CD and DVD playback systems containing their respective synchronous signals is provided, the DVD playback system having a synchronous DVD detector, analyzing the system if a Synchronous DVD output from the synchronous detector? DVD is or is not detected, when it is detected that a disc is mounted, the DVD playback system being selectively activated when it is detected that the DVD synchronous signal performs a DVD mode. DVD playback, the CD playback system is selectively driven when the DVD synchronous signal is not detected for a predetermined time, to perform a CD playback mode.

BRIEF DESCRIPTION OF THE DRAWINGS A more complete appreciation of this invention, and many of the advantages in question thereto, will be readily apparent as it is better understood by reference to the following detailed description, how it is taken together with the accompanying drawings, in which like reference numbers indicate the same or similar components, wherein: Fig. 1 is a block diagram of a digital video disc playback apparatus; Fig. 2 is a diagram for explaining the relationship between the length? Wave of light, the numerical aperture of the objective lens, and the diameter? The optical focus in the apparatus? And digital reproduction; Fig. 3 is an explanation diagram of the relationship between the depression and the optical focus with respect to the video disc and the compact disk; Fig. 4 is a diagram for explaining the principle of double focus optical pickup; Fig. 5 is a block diagram of a device for detecting the type of disc mounted on a disc player, according to the first embodiment of the present invention; Figs. 6A-6E show the characteristics of the detection of the synchronous signal of the CD structure, in order to detect the type of? Isco? E according to the first modality ?; Fig. 7 is a block diagram of a device for detecting the synchronous signal of the CD structure according to the embodiment of the present invention; Fig. 8 shows a flow diagram explaining the operation of the disc type detection mounted on the disc player; Fig. 9 is a block diagram of a device for detecting the type of disk mounted in a? Rac player, according to the second embodiment of the present invention; Fig. 10 is a diagram showing an example of a DVD synchronous pattern; Figs. 11A-11C show the detection characteristics of the CD synchronous structural signal, in order to detect the type of disc, according to the second modality; Fig. 12 shows a flow chart explaining the operation of detecting the type of disc mounted in the disc player according to the second embodiment; Fig. 13 is a block diagram of a device for detecting the type of disc mounted in a? Reproducer according to the third embodiment of the present invention; Y Figs. 14A and 14B show a flow diagram explaining the operation of detecting the type of disc mounted in the disc player, according to the second embodiment.

DETAILED DESCRIPTION OF THE PREFERRED MODALITY First Mode Fig. 5 shows a configuration for automatic detection of the type of discs mounted in the first mode of the disc recording / playback system, which has CD and DVD playback systems. It is assumed that the optical pickup 111 uses the optical CD / DVD pickup unit. The radio frequency (RF) receiver 512 amplifies a weak light signal reproduced from the optical pickup 111. Here, the RF output signal from the RF receiver 512 is a reprographic signal coming from the CD. or DVD. First, in the DVD playback system, the DVD equalizer or compensator 516 filters the DVD band of the received RF signal, and compensates for it. Here, the DVD band becomes a wide band that contains a CD band. The DVD signal processor (digital signal processor) 517 receives the DVD band of the current output? E data from the DVD compensator 516, in order to demodulate the modulated data and correct the errors produced during the previous procedure. The signal processor 517 of the DVD corresponds to the demodulator / corrector ECC 113 shown in Fig. 1. The decoder A / D 518 divides the output to the data coming from the processor? E signals 517 ? e DVD in video data and audio data, and the signal processes them. The A / V decoder 518 corresponds to the decoder 116 of the system, the video decoder 117 and the audio decoder 119. Second, in the CD playback system, the CD compensator 513 filters the CD band of the RF output signal coming from the RF receiver 512, and compensates it. The CD signal processor (digital signal processor) 514 demodulates the modulated data stream from the compensator? 513? The CD and corrects the pro? Cus errors during the previous procedure. The audio signal processor 515 processes the data signals from the signal processor 514 of the CD. This modelism of the electronic reproduction apparatus has systems, and CD and DVD reproduction. The optical sensor 111 is a uni? able to play CDs and DVDs. If a disc is mounted on the disc playing apparatus, it must determine whether the mounted disc is CD or DVD, and then a corresponding reproduction system must be selectively operated. For this, the synchronous listener 521? E CD is incorporated into the 514? E CD signal processor. The controller 511 decides the type of the mounted disk and selectively operates a corresponding playback system, depending on whether the output of the structural synchronous pattern or CD frame from the synchronous detector 521 of the CD is detected or not. For the structural synchronous pattern of the CD, a non-reproducing pattern is used from the modulative data. This ensures reliable synchronization, unless bit errors occur. The record recorded or recorded on the CD uses EFM modulation. According to the EFM modulation, eight bits of data are converted to 14 bits, and the pattern combination of at least three 3T bits and 11 bits maximum 11T is possible. For the structural synchronous pattern of CD, it is used "IOOOOOOOOOOIOOOOOOOOOOIOOB" (11T + 11T + 2T) does not use? or as? ato and shown as 6a in Fig. 6. The synchronous pattern of CD shown as 6a is recorded or recorded on the CD in the form of 6b or 6c of Fig. 6. The data format recorded on the CD is performed as 6d of Fig. 6. The synchronous detector 521 of the CD is formed as in Fig. 7. With reference to Fig. 7 it is applied a data stream input for entering register 71 and moving. The reference register 72 stores the CD box synchronous pattern shown as 6a of FIG. 6. The comparator 73 compares the pieces of the parallel output bit data of the input register 71, and the pieces of the bit data of FIG. parallel output of reference register 72, and sends the resulting comparison signal in unity? is of bits. The detector? E synchronous signals 74 logically combines the output? E data of bits from the comparator 73, and generates a signal to decide whether the synchronous signal of CD is detected or not. Here, the synchronous signal detector 74 uses a gate circuit. In the case where the HIGH logic signals are all sent from the comparator 73 in synchronous detection, the "synchronous signal eater 74 uses a" Y "(AND) gate. If the CD frame format is formed as 6d of FIG. 6, the synchronous detector 521 of the CD detects a synchronous signal of the CD in the synchronous pattern cycle shown as 6e in FIG. 6. The synchronous signal is generated in the 13.3 ms cycle. The signal "e" coming from the synchronous detector 521 of CD formed as in Fig. 7 is applied to the controller 511.

The controller 511 sets the CD mode as its initial mode, if it is detected that the disk is mounted. At a point in time when the constant linear velocity (CLV) servomechanism of the CD mode is ON, the synchronous frame signal of the reproduction system is produced in the 13.3 ms cycle. More specifically in the case where the data and its synchronous pattern are recorded on the CD as 6d in Fig. 6, the synchronous frame signal is detected in the 13.3 ms cycle during playback, as mentioned above. The synchronous frame signal is generated from all CD and VC discs. Here, the CLV servomechanism is applied to a 11T reference of the RF signal. When the controller 511 sets the CD mode as the initial operating mode, the CD synchronous pattern can normally be detected in the case that the mounted disc is a CD. However, if the DVD is mounted while the CD mode is set, the synchronous frame signal can not be detected while the CLV servomechanism is applied. In this mode, after the CLV servomechanism is applied when the disk is mounted while the initial drive mode is the CD mode, it is determined whether the reproduced synchronous signal is detected or not, to decide whether the current mode is CD or DVD. According to the decided result, the CD or DVD playback mode is selectively activated. Fig. 8 shows the method of selectively actuating a corresponding reproduction mode by detecting the type of the mounted disc, by the controller 511. As shown in this figure, in this mode it is determined whether the synchronous signal of the CD frame is detected or not, after the CD mode is set as the initial playback mode when the disc is mounted. If the synchronous signal is detected according to the result, it is determined that the CD is mounted so that the CD playback system is selectively driven. If the synchronous signal is not detected for a predetermined time, it is determined that the DVD disc is mounted so that the DVD playback system is selectively operated. With reference to Fig. 8 the controller 511 checks whether any disk is mounted. First of all, the controller 511 checks the status of the input portion 511, to find the ON / OFF of the tray with this. If the tray is ON / PAID the controller 511 detects it in steps 811 and 813, and then decides that the disk is mounted. After this, the controller 511 controls a servo controller (not shown) in step 815, to perform the focusing of the optical pickup 111. Here, the optical pickup 111 is a unit usable for CD and DVD. Therefore, the servocontroller drives the optical pickup 111 as the attached one? ? CD capture. The controller 511 raises or lowers the focus? The optical pickup 111 in step 815, and in step 817 checks whether the focus is made? Here, if the focus assurance is not made, the controller 511 detects this situation in step 817, and in step 819 decides that the disk is not mounted. This case indicates that the tray is ON / OFF by the user while the disc is not mounted. If the focus assurance is made in step 817, this state indicates that the disc is mounted in the tray. In this case the controller 511 controls the servo controller through steps 821-825 to rotate the mounted disk and turn on the tracking servomechanism and the CLV servomechanism. Here, the servo controller drives the shaft motor under the control of the controller 511, to rotate the disk with this. In addition, the tracking servomechanism is operated so that the optical pickup 111 tracks the tracks precisely. If the tracking servomechanism is finished, how fast? The rotation of the disc is controlled by the manipulation of the axis motor in the CLV mode of the CD playback mode. This situation shows that the CLV mode of the CD playback mode is adjusted during disc mounting, and the dtion of the CD frame synchronous signal is prepared. If the CD CLV servomechanism is ON, the controller 511 receives the output signal? The synchronous dtor 514 of CD in step 827, and verifies whether the synchronous CD frame signal is dted or not. Here, the synchronous dtor 521 of CD receives the current? E? Atos filters and compensates it in the CD bank, and the input data stream is compared with the synchronous pattern? E CD previously stored? . Here, the synchronous pattern which is stored in the reference register 72, is a peculiar pattern having a different format from the data recorded in the CD. The synchronous dtor 521 CD compares the synchronous pattern with the received data stream? E mo? O that the pattern having the same value is sent out as the synchronous CD frame signal. If the mounted disk is CD, the synchronous output signal from the synchronous dtor 521 of the CD is generated in the 13.3 ms cycle, as 6e in Fig. 6. The controller 511 dts in step 827 that the synchronous signal of CD box is dted? The synchronous signal is dted up to a predmined number through steps 829 and 831. The dtion number of the CD frame synchronous signal is set too low to decide that the mounted disk is CD. If the synchronous CD frame signal is dted as much as the predmined number, the controller 511 sets the optical pickup 111 as for CD in step 833, and resets the CLV servomechanism for CD playback. Subsequently, in step 835 the DVD signal processor 517 and the A / V decoder 518 are controlled, to inactivate with this the DVD playback system, and the processor? E signal 514 of the CD and the processor 515 of au. They are controllers to activate the system with CD playback. When doing this, the CD playback mode is performed.

However, if the synchronous frame signal of the CD is not detected in step 827, the controller 511 verifies in step 837 whether the predetermined time has elapsed. This means that the detection of the synchronous CD signal is performed for the predetermined time, even when the disc mounted is DVD. The controller 511 waits to detect the synchronous CD frame signal for the predetermined time, after the CLV servomechanism of CD, is ON. If the synchronous signal is not detected by this time, it is decided that the mounted disk is DVD. The predetermined time is a period in which several synchronous signals can be detected from the CD frame. If the synchronous signal of the CD frame is not received in the predetermined time, the controller 511 detects this state in step 837, and in step 839 decides that the mounted disc is DVD. In step 841 the optical pickup 111 is detected for DVD, and the DVD CLV servomechanism is ON. If the CLV is secured after this, the controller 511 detects it in step 843, and in step 845, the signal processor 514 of the CD and the audio processor 515 are turned OFF, to stop the operation of the playback system of the CD. The DVD signal processor 517 and the A / V decoder 518 are activated to drive the DVD playback system and perform the DVD playback mode. In the first mode described above, the CD playback mode is first performed when the disc is mounted in a disc playback system, to play the CD and the DVD, to verify if there is a synchronous signal of signal or CD frame of the disc. If the synchronous CD frame signal is detected, it is detected that the mounted disc is CD, and the CD playback system is activated to perform a CD playback mode. If not, it is decided that the mounted disc is DVD and the DVD playback system is activated to perform the DVD playback mode.

Second Modality Fig. 9 shows a configuration of automatic detection of the type of discs mounted in the second mode of the disc recording / playback system, which has CD and DVD playback systems. It is assumed that the optical pickup 111 uses the CD / DVD optical pickup unit.

The radio frequency (RF) receiver 512 amplifies a reproduced weak light signal from the optical pickup 111. Here, the RF output signal from the RF receiver 512 is a reproduced signal from the CD or the DVD. First, in the CD playback system, the compensator 513? The CD filters the CD band of the output signal? E RF from? The RF receiver 512 and compensates for it. The signal processor 514 of the CD demodulates the modulated data stream, and sent from the CD compensator 513, and corrects the errors produced during the previous procedure. The audio processor 515 processes the data outputs from the signal processor 514 of the CD. Secondly, in the DVD playback system, the DVD Compensator 516 filters the TV's DVD and receives the signal, and compensates for it. Here, the DVD library becomes a broad band that contains the ban? E CD. The 517? D processors DVD receives the DVD stream from the data stream from the 516 DVD compensator to demoulate the modulated? Atos, and corrects the errors produced during the previous procedure. The DVD signal processor 517 corresponds to the ECC demodulator / corrector 113 shown in FIG. 1. The A / D decoder 518 divides the data from the signal processor 517 of the DVD into video data and audio data, and the signal he processes them. The decoder A or V 518 corresponds to the decoder 116 of the system, the video decoder 117 and the audio decoder 119. This fashion? of the disc playback apparatus has CD and DVD playback systems. Optical pickup 111 is a unit capable of playing CDs and DVDs. If a disc is mounted on the disc player, it must determine if the mounted disc is CD or DVD, and subsequently a corresponding reproduction system must be selectively activated. For this, the synchronous DVD detector 522 is incorporated in the processing of signals 517 and DVD. The controller 511 decides the type of mounted disk and selectively operates a corresponding playback system, depending on whether the output signal? The structural synchronous pattern or? E qu? The CD from the synchronous detector 522 of the DVD is Etected or not.

For the structural synchronous or DVD frame pattern, a non-produced pattern of the modulated data is used. This ensures reliable synchronization unless bit errors are produced. The recording or recording of the DVD uses EFM-mas modulation. In the DVD playback system that uses the EFM-mas modulation, the genuine data pattern is maximum 11T (100000000001B). Therefore, the DVD synchronous pattern commonly uses a pattern not used in the genuine data. In this case, such a pattern must exceed a minimum of 12T. DVD uses multiple synchronous patterns in combination, in an appropriate way. Here, those synchronous patterns commonly have specific patterns that do not use the pattern of? Atos. In this mode it is assumed that the common pattern used in the synchronous pattern is 14T. It is assumed that the common pattern is located in the lower 14 bits of each of the synchronous patterns. Fig. 10 shows an example in which the synchronous pattern of the DVD and the pieces of data are stored in a sector format. In Fig. 10 the reference character S indicates the synchronous patterns, with Dl-D being the genuine data. The al-a2 reference characters represent the length of the synchronous pattern, with bl-b2 being the length of the data. The reference characters cl-c2 indicate the length of the structure or synchronous frame. The reference character E represents the length ? two synchronous frames or structures. Here, the data length b is much longer than the length a of the synchronous pattern. The reference character F indicates the number of rows of two synchronous structures or frames that make up the sector. It is therefore noted that the size of a DVD sector becomes F * E [2c? F = 2 (a + b) * F]. The format in sectors recorded or recorded on the DVD is converted as shown in Fig. 10. In this format, the synchronous pattern is formed as shown in Fig. 11. Here, the synchronous pattern is shaped with bits to , and the lower bits? the synchronous pattern have 14T commonly. The lower 14 bits of the multiple synchronous patterns used in DVDs have the value. Its higher bits have different values. As shown in 11b and 11c of Fig. 11, the data transfer time between the synchronous structural or DVD frame patterns becomes 1.2 ms. The synchronous detector 522 DVD for the detection of the synchronous structural or DVD frame patterns shown in Figs. 10 and 11, can be implemented in the same configuration as the synchronous detector 521 of the CD shown in Fig. 7. In this case the reference register 82 of the synchronous detector 522. of the DVD stores the lower data pieces of 14 bits which have a common value in the DVD box patterns as shown in Fig. The compare 73 compares the playback data streams "output", parallel, of the input register 71 and the synchronous pattern or DVD frame of the recorder? E references 72, and sends? E output to the The resulting signal is the comparison in uni? a? e? e bit. The? Ector? E synchronous signals 74 logically combines the bit data output from the comparator 73, and generates a signal to decide whether the synchronous signal? E DVD is detected or not. If the DVD sector format is formed as in Fig. 10, the DVD synchronous detector 522 detects a synchronous or DVD frame synchronous signal in the synchronous pattern cycle shown as 11c of Fig. 11. The pattern Synchronous structural or DVD frame is reproduced in the 1.2 ms cycle. The DVD synchronous detector 521 detects the frame or frame synchronous signal DV "and sends it out to the controller 511. The 511 controller sets the DVD mode as its initial mode if the disc is detected to be mounted. constant linear speed (CLV) of the DVD mode is ON, and if the mounted disk is a DVD, where the data patterns and synchronous patterns are recorded as shown in Fig. 10, the controller 511 receives the synchronous structural or DVD frame signal in the 1.2 ms cycle. When the 511 controller sets the DVD mode as the initial operating mode, the DVD synchronous pattern can be normally set in the case where the mounted disc is DVD. However, if the CD is mounted while the DVD mode is set, the synchronous structural signal can not be detected while the CLV servomechanism is applied. In this mode, after the CLV servomechanism is applied when the disc is mounted while the initial drive mode is the DVD mode, it is determined whether the reproduced synchronous signal is? Detected? Or not, to decide whether the current mode is CD or DVD. According to the chosen result, the CD or DVD playback mode is selectively activated. Fig. 12 shows the method of selective activation of a corresponding production mode by the detection of the controller 511, of the type of disk mounted according to the second embodiment. As shown in this figure, in this mode it is determined whether the structural synchronous or DVD frame signal is detected? A or not, after it is set to DVD mode as the initial playback mode, when the disc is mounted. If the synchronous signal is detected according to the result, it is determined that the DVD is mounted, so that the DVD playback system is selectively activated. If the synchronous signal is not detected for a predetermined time, it is determined that the mounted disc is CD, so that the CD playback system is selectively operated. With reference to Fig. 12, the controller 511 checks if any disk is mounted. First, the controller 511 verifies the status of the input portion 510, to find out with this the ON / OFF of the tray. If the tray is ON / OFF the controller 511 detects it in steps 1211 and 1213, and then decides that the disk is mounted. After this, the controller 511 controls a servo controller (not shown) in step 1215 to perform the focusing of the optical pickup 111. Here, the optical pickup 111 is a unit usable for CD and DVD. Therefore, the servocontroller operates the optical pickup 111 as the CD pickup unit. The controller 511 raises or lowers the focus of the optical pickup 111 in step 1215, and in step 1217 checks whether the focus is secured. Here, if the focus assurance is not made, the controller 511 detects this situation in step 1217, and in step 1219 it decides that the iscus is not mounted. This case indicates that the tray is ON / OFF by a user, while the disc is not mounted. If the focus assurance is performed in step 1217, this state indicates that the disc is mounted on the tray. In this case, the controller 511 controls the servo controller through steps 1221-1225, to rotate the mounted disk and turn on the tracking servomechanism and the CLV servomechanism. Here, the servo controller drives the shaft motor under the control of the controller 511 to rotate the disk with this. In addition, the tracking servomechanism is operated so that the optical pickup 111 follows the grooves precisely. If the tracking servomechanism is finished, the disk rotation speed is controlled by manipulating the axis motor in the CLV mode of the DVD playback mode. This situation shows that the CLV mode of the DVD playback mode is adjusted during the mounting of the disc, and the detection of the DVD structural synchronous signal is prepared. If the DVD CLV servomechanism is ON, the controlled 511 receives the output of the synchronous detector 522 of the DVD in step 1227, and checks whether the structural synchronous signal? E DVD is? Detected or not. Here, the DVD synchronous detector 522 receives the current? Filtered and compensated in the DVD band, and the input? E current? E? Atos is compared with the previously stored synchronous DVD structural pattern. Here, the structural synchronous pattern of DVDs commonly has the reference data stored in the record? E reference 72, and is a peculiar pattern (14T) having a format different from the data recorded in the DVD. The synchronous detector 522 of the DVD compares the synchronous detector with the current of received signals, and it is the case that the pattern having the same value is sent out as the DVD synchronous structural signal. If the mounted disc is DVD, the synchronous output signal coming from? The synchronous detector 522 of the DVD is generated in the cycle? E 1.2 ms, as in Fig. 11c. The controller 511 detects in step 1227 that the DVD's synchronous structural signal is detected. The synchronous signal is detected up to a predetermined number through steps 1229 and 1231. The detection number of the DVD structural synchronous signal is adjusted to decide very much that the mounted disc is DVD. If the DVD synchronous structural signal is detected as much as the predetermined number, the controller 511 sets the optical pickup 111 to be DVD in step 1233, and resets the CLV servomechanism for DVD playback. Subsequently, at step 1235 the DVD signal processor 517 and the A / V decoder 518 are controlled to activate the DVD playback system, and the CD signal processor 514 and the au- thio processor 515 are controlled to inactivate with this the CD playback system. By doing this, the DVD playback mode is performed. However, if the DVD structural synchronous signal is not detected in step 1227, the controller 511 verifies in step 1237 whether the predetermined time has elapsed. This means that the detection of the DVD synchronous structural signal is performed for the predetermined time, even when the disc mounted is CD. The controller 511 waits to detect the structural synchronous signal of the DVD for the predetermined time, after the CLV servomechanism is ON. If the synchronous signal is not detected by this time, it is decided that the disk mount is CD. The predetermined time is a period in which the various structural synchronous signals of the DVD can be detected. If the DVD synchronous structural signal is not received by the predetermined time, the controller 511 decides in step 1239 that the mounted disc is CD. In step 1241 the optical pickup 111 is set for CD, and the CLV CD servo drive is ON. If the CLV is secured after this, the controller 511 detects it in step 1243, and in step 1245 the signal processor 514 of CD and the processor? E audio 515 are ON, to activate the operation of the reproduction system of CD. The signal processor 517 of the DVD and the A / V decoder 518 are inactivated to drive the DVD playback system and perform the CD playback mode. In the second mode as described above, the DVD playback mode is first performed when the disc is mounted in a disc playback system for CD and DVD playback, to verify with this whether there is a DVD structural synchronous signal of the disk. If the DVD synchronous structural signal is detected, it is detected that the mounted disc is DVD and the playback system? E DVD is activated to perform the DVD playback mode. If not, it is decided that the mounted disc is CD and the CD playback mode is activated.

Third modality Figure 13 shows a configuration of the automatic detection of the type of discs mounted in the third fashion? of the recording / playback system of? iscos that has systems? and CD and DVD playback. It is assumed that the optical pickup 111 uses the optical CD / DVD pickup unit. The radio frequency (RF) receiver 511 amplifies a weak light signal reproduced from the optical sensor number 111. Here, the RF output signal from the RF receiver 511 is a signal reproduced from the CD or from the DVD. First, in the CD playback system, the CD compensator 513 filters the CD band of the RF output signal from the RF receiver 512 and compensates for it. The signal processor 514 of the CD demodulates the mooled data stream and sends it out from the compensator? 513? The CD, and corrects the pro? Cus errors? During the previous procedure. The audio processor 515 processes the signal of the output data coming from the signal processor 514 of the CD. Secondly, in the playback system - the DVD, the 516 compensates - the DVD filters the DVD band of the received RF signal, and compensates for it. Here, the DVD band becomes a wide band that contains the CD band. The processor 517 of DVD receives the DVD band of the current output of? Ates coming from? The DVD compensator 516, to demodulate with this the moÂculated data and correct the errors produced during the previous procedure. The described signal procedure 517 of DVD corresponds to the demodulator / ECC corrector 113 shown in Fig. 1. The A / D decoder 518 divides the data output signal from the DVD signal processor 517 into data of video and audio data, and process the signals. The A / V decoder 518 corresponds to the system decoder 116, the video decoder 117 and the audio decoder 119. This mode of the disc playback apparatus has CD and DVD playback systems. Optical pickup 111 is a unit capable of playing CDs and DVDs. If a disc is mounted on the disc reproduction apparatus, it must be determined whether the disc mounted is CD or DVD and then a corresponding reproduction system must be selectively operated. For this, the synchronous detector 521 of the CD is constructed in the signal processor 514 of CD, and the synchronous detector 522 of DVD is incorporated in the signal processor 517 DVD. The controller 511 decides the type of the mounted disk and selectively operates a corresponding playback system, depending on whether the signal is output from the CD or DVD structural synchronous pattern coming from the synchronous or 522 or 522 CD player. DVD, respectively, is detected or not. As explained above, CDs and DVDs have different structural or frame synchronous patterns. For this reason, the disc playback system that has CD and DVD playback systems can detect the type of discs by checking the synchronous structural pattern recorded or recorded on the disc. Here, the characteristics of the structural synchronous pattern of CD are the same as those in the first embodiment of Fig. 6. The characteristics of the structural synchronous pattern of DVD are the same as those in the second embodiment of Figs. 10 and 11. The synchronous CD detector 521 for the detection of the CD's synchronous structural pattern and the DVD's synchronous structural detector for the detection of the DVD's structural synchronous pattern, can be constructed as in FIG. 7, in accordance to the first and second modalities. Here, the reference register 72 of the synchronous detector 521 of the CD stores the structural synchronous pattern of the CD shown as 6a of FIG. 6. The reference register 72 of the synchronous detector 522 of the CD stores the DVD's synchronous structural pattern shown as of Fig. 11. If the mounted disk is initially detected, the controller 511 adjusts its initial drive mode as the CD or DVD mode. Here, if the controller 511 sets the initial drive mode as CD mode, the structural synchronous pattern CD can be detected normally in the case that the mounted disk is CD.

However, if the DVD is mounted while it is set to CD mode, the synchronous structural signal can not be detected while the CLV servomechanism is applied. In this case, the controller 511 converts the initial operation mode to the DVD mode so that the DVD's synchronous structural signal can be detected by the synchronous detector 522? E DVD. Conversely, if the controller 511 sets the initial drive mode as a DVD mode, the DVD's structural synchronous pattern can normally be detected in the case where the mounted disk is DVD. However, if the CD is mounted while the DVD is set, the synchronous structural signal can not be detected while the CLV servomechanism is applied. In this case, the controller 511 converts the initial operation mode to the CD mode, so that the CD synchronous structural signal can be detected by the synchronous CD detector 521. In this third embodiment of the present invention, the initial mode of operation is set as CD mode when the disc is mounted, and then it is verified whether or not the CD's synchronous structural pattern is detected. If the pattern is detected, the playback mode? The CD is carried out continuously.

If not, then the current mode is converted to DVD mode to detect the DVD's structural synchronous pattern, and then continuously perform the DVD playback mode. Figs. 14a and 14b show the flow chart of the method of selectively actuating a corresponding reproduction mode by detecting controller 511, of the type of the disc, when the disc is mounted, according to the third embodiment of the present invention. invention. With reference to FIG. 13, the controller 511 detects the DC synchronous structural signal in the sequence of the first mode through steps 1411-1435 of FIG. 14a. When the CD's synchronous structural signal is detected, the CD playback system is selectively driven to perform CD playback mode. First of all, if the disk is detected to be mounted, the CD playback mode is set as the initial drive mode, and the output? The synchronous CD detector 521 is analyzed. If it is? Ect to the structural synchronous CD signal, it is then determined that the mounted disc is CD and the CD playback mode is carried out.

If the CD structural synchronous signal is not received for a predetermined time in the state in which the CD mode is set as the initial drive mode, the controller 511 is detected in step 1437 of FIG. . 14 to. Subsequently, in step 1439 of Fig-. 14b, the current mode is converted to DVD mode so that the optical pickup 111 is controlled to play the information recorded on the DVD. Through steps 1449-1467, the DVD structural synchronous signal is detected and the DVD playback mode is carried out, as in the second mode. In the third mode of the present invention, the CD playback mode is first carried out to verify whether or not the structural synchronous signal of CD? The? Isco is detected, when the disc is mounted in the system. ? e? Isco? repro, able to play simultaneously CD and DVD. If the CD structural synchronous signal is not detected, the DVD structural synchronous signal is detected. In still another aspect of the present invention, the DVD playback mode is first performed to verify whether the DVD's synchronous structural signal of the disc is detected or not. If the DVD structural synchronous signal is not detected, the DVD's synchronous structural signal can be detected. In this situation, if the DVD structural synchronous signal is detected, the mounted disc is detected as DVD, and the DVD playback system is activated to carry out the DVD playback mode. Here, if the structural synchronous signal? E DVD is not? Etect? For a term? Etermina?, the DVD drive mode is converted to the mo? o? e CD, and then the synchronized CD structural signal is detected. By doing this, the mounted disc is determined as CD, and the CD playback system is activated to carry out the CD playback mode. In the first, second and third embodiments of the present invention, a simple sensor has been explained, capable of reproducing CDs and DVDs. However, the present invention can also be applied to a disc reproduction system having a CD only pickup and DVD only pickup, separately. In this configuration, the data stream generated from the CD only sensor is first analyzed when a disk is mounted, to verify with this whether the CD structural synchronous signal is "detected" or not. Here, if the CD synchronous structural signal is detected, the CD playback mode is carried out. If the signal is not detected for a predetermined time, the DVD-only pickup is activated to select the DVD playback system and perform the DVD playback mode. As described above, the present invention is capable of automatically detecting the type of disc inserted in an apparatus for the reproduction of multiple discs. Especially, the synchronous signal of the mounted disk is detected in order to decide the type of disk, and how the disk type can be "detected" or accurately. According to the detected result, a corresponding disk playback mode is automatically carried out. Therefore, it should be understood that the present invention is not limited to the particular embodiment described herein, as the best mode contemplated for carrying out the invention, but rather the present invention is not limited to the specific embodiments described in this specification, except as stated in the attached claims.

It is noted that in relation to this date, the best method known to the applicant to carry out the aforementioned invention, is the conventional one for the manufacture of the objects to which it refers.

Having described the invention as above, property is claimed as contained in the following:

Claims (10)

1. An optical disc reproduction apparatus, characterized in that it has CD and DVD playback systems containing their respective synchronous signals, the CD playback system has a synchronous CD detector, the system that analyzes whether a synchronous CD output signal What is the result of the synchronous? ector? CD is? ected? or not how much of a disc is mounted, is the system and CD playback selectively driven when the synchronous CD signal is detected? In order to perform a CD playback mode, the DVD playback system is selectively driven when the synchronous CD signal is not "detected" for a predetermined time to perform a DVD playback mode.

2. An optical disc reproducing apparatus, characterized in that it has an optical pickup for CD and DVD having different synchronous signals, and that also has CD and DVD playback systems, the playback system? E CD has a? CD synchronous? Ector , being controlled the optical pickup for CD only, and the system analyzes if a synchronous output signal of CD coming from the? CD synchronous sensor, is detected or not when it is detected that a disc is mounted, being selectively activated the CD playback system, when the synchronous signal? e CD is? set to perform a CD playback mode, the optical pickup is controlled for DVD only, and the DVD playback system is selectively driven when the Synchronous CD signal is not detected for a predetermined time to perform a DVD playback mode.

3. A method of reproducing an optical disc reproducing apparatus, characterized in that it has an optical pickup for CD and DVD having different synchronous signals, and that it also has CD and DVD playback systems, the CD playback system having a detector synchronous CD, the optical pickup is controlled for CD only, and the system analyzes whether a synchronous CD output signal from the CD synchronous detector is detected or not, when it is detected that a disc is mounted, the disc is selectively driven. CD playback system when the CD synchronous signal is detected to perform a CD playback mode, the optical pickup is controlled for DVD only and the DVD playback system is selectively driven when the CD synchronous signal is not detected by a predetermined time to make a DVD playback mode.

4. An apparatus for reproducing optical discs, characterized in that it has CD and DVD playback systems containing their respective synchronous signals, the DVD playback system having a synchronous DVD player, the system analyzes whether a synchronous DVD signal from the DVD synchronous detector, is it detected or not when a disc is detected to be mounted, the DVD playback system is selectively triggered when the synchronous DVD signal is detected to perform a mode of DVD playback, the CD playback system is selectively driven when the synchronous DVD signal is not detected for a predetermined time to perform a CD playback mode.

5. An optical disc reproducing apparatus, characterized in that it has a double focus optical pickup for CD and DVD having different synchronous signals, and that it also has CD and DVD playback systems, the DVD playback system having a synchronous detector of DVD, the optical pickup is controlled for DVD only, and the system analyzes whether a DVD synchronous output signal from the synchronous DVD detector is detected or not when a disc is detected, the DVD playback system is detected. is selectively driven when the synchronous signal is being used? DVD is detected to perform a mode for DVD playback, optical pickup is controlled for CD only, and the CD playback system is selectively driven when the DVD synchronous signal is not it is detected by a predetermined time to perform a playback mode? e CD.

6. A method for the reproduction of an optical disc apparatus, characterized in that it has a dual focus optical pickup for CD and DVD that have different synchronous signals, and that also has CD and DVD playback systems, the DVD playback system has a ? Synchronous detector? DVD, the optical pickup is controlled for DVD only and the system analyzes whether the synchronous DVD signal coming from the synchronous DVD detector is detected or not when a disc is detected, the playback system DVD is selectively driven when the DVD synchronous signal is detected to perform a DVD playback mode, the optical pickup is CD control only and the CD playback system is selectively driven when no signal is detected synchronous DVD for a predetermined time to perform a CD playback mode.

7. An optical disc player apparatus, characterized in that it contains CD and DVD playback systems containing their respective synchronous signals, the CD and DVD playback systems have respectively synchronous detectors, the systems analyze a synchronous output and output from Synchronous detectors When it is detected that an iscus is mounted, the CD playback system is selectively driven when a synchronous CD signal is detected to perform a CD playback mode, the DVD playback system is selectively triggered when a CVD synchronous signal is detected to perform a DVD playback mode.

8. An optical disc playing apparatus, characterized in that it has a double focus optical pickup for CD and DVD having different synchronous signals, and that it also has CD and DVD playback systems, respectively having the synchronous detector systems, the optical pickup is controlled for CD only and the systems analyze whether a synchronous CD output signal from the CD synchronous detector is detected or not detected when a disc is detected, the CD playback system is selectively driven when the CD synchronous signal is detected is detected to perform a CD playback mode, the optical pickup is controlled for DVD only and the DVD playback system is selectively operated when the synchronous CD signal is not detected for a pre-determined time, to perform a DVD mode. DVD playback.

9. An optical disc reproducing apparatus, characterized in that it has a double focus optical pickup for CD and DVD having different synchronous signals, and that it also has CD and DVD playback systems, the systems have respectively synchronous detectors, the optical pickup it is control for DVD only, and the systems analyze if a signal is output synchronous and DVD coming from the? synchronous DVD? etector is detected or not when a disc is detected, the system is mounted? DVD playback is selectively triggered when the DVD synchronous signal is detected to perform a DVD production mode, the optical pickup is controlled for CD only and the CD playback system is selectively driven when the signal is detected synchronous? e CD, to make a CD playback mode.

10. An optical disc playing apparatus, characterized in that it has a double focus optical pickup for CDs and DVDs having different synchronous signals, and that it also has CD and DVD playback systems, the CD and DVD playback systems have respectively synchronous detectors, the systems analyze a synchronous output signal from the synchronous detectors when it is detected that an iscus is mounted, the CD playback system is selectively driven when a synchronous CD signal is detected to perform a CD playback mode, the DVD playback system being selectively operated, when a synchronous DVD signal is detected to perform a DVD playback mode.