CN1581307A - System and method for discriminating optical storage medium recording area - Google Patents
System and method for discriminating optical storage medium recording area Download PDFInfo
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- CN1581307A CN1581307A CN 03154333 CN03154333A CN1581307A CN 1581307 A CN1581307 A CN 1581307A CN 03154333 CN03154333 CN 03154333 CN 03154333 A CN03154333 A CN 03154333A CN 1581307 A CN1581307 A CN 1581307A
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Abstract
The invention is related to the system and the method for determining whether a reflected beam is reflected from several heading areas on optical storage media. The optical judgment system includes a light beam detection module and a signal detection module. When a reflected beam is reflected from first recording position of the heading area, the method generates first handing signal. When a reflected beam is reflected from second recording position of the heading area, the method generates second handing signal. When address information is contained in the reflected beam, a marking signal of address is generated. When the said first heading signal, second heading signal, as well as marking signal of address are received in sequence in a period, the method determines the reflected beam from one of these heading areas.
Description
Invention field
The present invention relates to a kind of optics judgement system and method thereof, particularly a kind of being applied in the optical read-write device, the optics judgement system and the method for differentiation optical storage media header area.
Background of invention
See also Fig. 1.Fig. 1 is the synoptic diagram of a track 10 of existing CD.Has plurality of tracks 10 in the existing CD.Distinguishing on these tracks 10 has plurality of sections 14 (sector), and each section 14 is made up of a header area 16 and a recording areas 18.And be distributed with hole 11,12,13 (pit), plurality of records hole on the track 10.The record pit hole 11,12 of header area 16 is used to write down the address information of section 14 respectively along the arranged on both sides up and down of track 10.13 centres that are positioned at track, the record pit hole of recording areas 18 are used for the record data content.
In the existing CD-disc read-write equipment, correctly recognize and reduce wrong the generation when header area can make optical read-write device read and write data.Prior art is to utilize acquisition low pass high-frequency signal to subtract each other (low pass filtered RFsubtraction, RFSUB) signal or differ detection (differential phase detection, DPD) the title indicator signal that signal produced (header indication signal) is come auxiliary identification header area, makes the servocontrol (servo control) of optical read-write device more reliable with the running of preamplifying circuit (RF circuit).
See also Fig. 1 and Fig. 2, Fig. 2 produces circuit for the title indicator signal of existing CD-disc read-write equipment.
Prior art utilizes light beam to be incident upon the distribution that track 10 center section detection record are cheated holes (pit), to obtain four kinds of signal A, B, C and D respectively.Signal A, B, C and D indicate the hole hole distribution of each track in A, B, C and the four kinds of positions of D of Fig. 1 respectively.
Because the difference that the record pit hole distributes, the power of signal A, B, C and D are also different.Then, signal A, B, C and D enter and add/subtracter 20 (Fig. 2).Add/subtracter 20 carries out the computing of E=(A+D)-(B+C).The E value enters high threshold values comparer 24 and low valve valve comparer 26 respectively through behind the low-pass filter 22 subsequently.
When light beam through header area 16 go up row's record pit hole 11 time because hole, no record hole, track below, so A, D signal are greater than B, C signal, so the E value is greater than 0.The E value obtains title indicator signal CP1 through too high threshold values comparer 24.Since E value through the value of low valve valve comparer 26 backs less than 0, therefore when light beam process Fig. 1 header area 16 upward arrange record pit hole 11 time can not produce title indicator signal CP2.On the contrary, when light beam during through following row's record pit hole 12 of header area 16, because hole, no record hole, track top, so B, C signal are greater than A, D signal, so the E value is less than 0.The E value obtains title indicator signal CP2 through low valve valve comparer 26.Because the value of E value behind too high threshold values comparer 24 less than 0, therefore can not produce title indicator signal CP1 when light beam passes through following row's record pit hole 12 of Fig. 1 header area 16.
U.S. patent application case number No. 2002/0039331, just directly whether utilization has title indicator signal CP1 and CP2 to recognize whether to read header area 16.When receiving title indicator signal CP1 and CP2 in succession, just the region is considered as header area 16.
Prior art is only according to title indicator signal CP1 or the CP2 signal as the identification header area.Yet,
Optical pickup device is easy to take place the phenomenon of BEAM SQUINT track centre in reading the process of CD, therefore normal not timing ground title indicator signal CP1 or CP2 occur at place, non-header area.Therefore, prior art often can't reach the function of correct identification header area, and causes the identification mistake.Mistake when this identification mistake can further cause the optical read-write device writable disc.Therefore, need a kind of method and system thereof of correctly identification header area, the mistake during with minimizing optical read-write device writable disc, and then the operating efficiency of raising optical read-write device.
Summary of the invention
An object of the present invention is to provide a kind of optics judgement system and method thereof, can solve prior art problems.
Another object of the present invention provides a kind of optics judgement system and method thereof, correctly differentiates a folded light beam and whether reflects a plurality of header areas (header) on an optical storage media.
In one embodiment, optics judgement system of the present invention system is used to differentiate a folded light beam and whether reflects a plurality of header areas (header) on an optical storage media.This optics judgement system comprises a beam detection module and a signal detection module.
When one the first record position reflex time of this folded light beam, produce one first header signal by the header area.When one the second record position reflex time of this folded light beam, produce one second header signal by the header area.When having an address information in this folded light beam, produce an address mark signal.When receiving this first header signal and this second header signal in succession, and when receiving this address mark signal during this period, then differentiating this folded light beam is that reflection is from one of these header areas.
The present invention utilizes first header signal, second header signal and address mark signal to differentiate the header area simultaneously, can reduce because wrong first header signal, second header signal causes the header area to differentiate the wrong situation that causes read error.The present invention also owing to produce mask signal, is further covered first header signal, second header signal of mistake, has reached to reduce the purpose of disturbing.
Reach advantage and spirit can be further understood by the following detailed description and accompanying drawings about the present invention.
Description of drawings:
Fig. 1 is the synoptic diagram of a track of existing CD.
Fig. 2 produces circuit for the title indicator signal of existing CD-disc read-write equipment.
Fig. 3 is the functional block diagram of optics judgement system of the present invention.
Fig. 4 is that signal takes place and several differentiate the synoptic diagram of embodiment in Fig. 3 optics judgement system.
Fig. 5 is the flow chart of steps of the optics determination methods of specific embodiment three shown in Figure 4.
The accompanying drawing sign:
50: optics judgement system 52: the beam detection module
54: 56: the first logic units of signal detection module
Logic unit 60 in 58: the second: counter
CP1: the first header signal CP2: second header signal
IS original state MS: shielding status
MP: between the shielded area
Preferred embodiment
The invention provides a kind of optics judgement system, be used to differentiate a folded light beam and whether reflect header area on an optical storage media.This folded light beam is emitted by an optical read-write device, and produces via this optical storage media reflection.This optical storage media is a known CD, as DVD-RAM.This optical read-write device can be a known CD-ROM drive or CD writer.
See also Fig. 3, Fig. 3 is the functional block diagram of optics judgement system 50 of the present invention.Folded light beam 51 is reflection tracks 10 from optical storage media shown in Figure 1.Header area on this optical storage media then utilizes the header area 16 of Fig. 1 to be illustrated.Each header area 16 comprises one first record position and one second record position to write down a positional information.This first record position is the row of the going up record pit hole 11 of Fig. 1 header area 16.This second record position is following row's record pit hole 12 of Fig. 1 header area 16.According to the DVD-RAM specification, this address information can be the vibration district of the variable frequency in the header area (VariableFrequency Oscillator Field), address mark district (Address Mark Field), physical I D district (Physical ID Field) information or other signal that produces with reference to above information.
Optics judgement system 50 includes a beam detection module 52 and a signal detection module 54.Beam detection module 52 is used to receive folded light beam 51.When folded light beam 51 by this first record position reflex time, beam detection module 52 produces one first header signal CP1.When folded light beam 51 by this second record position reflex time, beam detection module 52 produces one second header signal CP2.When having this address information in the folded light beam 51, beam detection module 52 produces an address mark signal.
Signal detection module 54 is used to receive the first header signal CP1, the second header signal CP2 and this address mark signal.Signal detection module 54 has an original state IS and a shielding status MS.Which kind of state signal detection module 54 should be in, and itself is controlled by signal detection module 54.When being in original state IS, signal detection module 54 receives all first header signal CP1 and the second header signal CP2.When being in shielding status MS, signal detection module 54 can produce the mask signal (Mask Signal) of one-periods, to cover (Mask) at the first header signal CP1 and the second header signal CP2 that non-header area was received.
See also Fig. 4.Fig. 4 is that signal takes place and several differentiate the synoptic diagram of embodiment in the optics judgement system 50 of Fig. 3.Owing on this optical storage media plurality of sections is arranged, and each section comprises a header area 16 and a record district 18, therefore, beam detection module 52 can periodically be sent the first header signal CP1 and the second header signal CP2 when reading each header area.Yet the problem at laser beam offset track center often takes place in optical read-write device when reading optical storage media, thereby sometimes at 18 places, record district, still can send the first header signal CP1 and the second header signal CP2.Be the first header signal CP1 and the second header signal CP2 the first header signal CP1 ' and the second header signal CP2 ' at this moment for the mistake of Fig. 4.
When CD-ROM drive began to read this optical storage media, signal detection module 54 was defaulted in original state IS.When signal detection module 54 receives the first header signal CP1 and the second header signal CP2 in succession, and when receiving this address mark signal during this period, can differentiate folded light beam 51 is that reflection is from one of these header areas.When signal detection module 54 determines folded light beam 51 is to reflect from the header area, just is converted to shielding status MS by original state IS.When signal detection module 54 is in original state IS, must receives the first header signal CP1 and the second header signal CP2 in succession, and when receiving address mark signal during this period, could judge that this folded light beam is that reflection is from the header area.When this signal detection module 54 is in shielding status MS, can periodically produce a mask signal, the first header signal CP1 and the second header signal CP2 that shelter receives.Therefore, as long as receive the first header signal CP1 and the second header signal CP2 of not crested, promptly this folded light beam of decidable is that reflection is from the header area 16.The signal length of this mask signal can be set to the distance 14 of adjacent header area.This distance 14 equals the length of each non-header area 16, also equals the length of this recording areas 18.Among Fig. 4, signal detection module 54 beginning transition statuses were represented by time shaft T with the time of sending this mask signal.
As shown in Figure 3, signal detection module 54 further comprises first logic unit 56 and second logic unit 58.First logic unit 56 is used to receive the first header signal CP1 and this mask signal.Second logic unit 58 is used to receive the second header signal CP2 and this mask signal.When first logic unit 56 received the first header signal CP1 ' and this mask signal simultaneously, this mask signal can cover the first header signal CP1 '.In like manner, when second logic unit 58 receives the second header signal CP2 ' and this mask signal simultaneously, can cover the second header signal CP2 '.
The present invention confirms by address mark signal whether light beam is positioned at header area 16, and further send the first header signal CP1 ' and the second header signal CP2 ' that this mask signal covers mistake, can reduce the chance that optical read-write device makes a mistake when reading optical storage media.
Optics judgement system 50 can further comprise counter 60 (counter).When signal detection module 54 was in shielding status MS, counter 60 was used to calculate the length of MP between a shielded area of sending this mask signal.According to a specific embodiment of the present invention, counter 60 can count from zero, and begins MP between the shielded area when counter 60 count down to one first special value, finishes MP between the shielded area after counting down to one second special value.When signal detection module 54 received the CP1 of not crested or CP2 signal, the counting of counter 60 can be returned to zero.Interval between this first special value and this second special value can be the length of a recording areas 18 in this optical storage media.
Cite an actual example at this function mode of counter 60 is described.Existing counter 60 is to be that unit carries out timing with byte (byte).When counter 60 receives the first header signal CP1 and the second header signal CP2, count from zero.When counter 60 calculated the 8th byte of recording areas 18, signal detection module 54 just can send this mask signal, and MP begins between the shielded area.Include 2567 bytes in the recording areas 18 of existing DVDRAM.Then when counter 60 calculated the 2,500 byte, signal detection module 54 just can finish MP between the shielded area, promptly stopped to send this mask signal.
When counter 60 receives the first header signal CP1 of not crested and the second header signal CP2 again, repeat above-mentioned steps.
Below will utilize the signal of every generation shown in Figure 4, the present invention's optics method of discrimination will be described with three embodiment.Main difference between each embodiment is that signal detection module enters and leave the condition enactment difference of shielding status.
According to one of specific embodiment of Fig. 4, because on the optical storage media, header area 16 is fixed with the length of recording areas 18.Therefore after having confirmed first header area 16 by the first header signal CP1, the second header signal CP2 and this address mark signal, signal detection module promptly enters shielding status MS.No matter whether subsequent optical judgement system 50 have is received this address mark signal again, and signal detection module all remains on shielding status MS.60 in counter counts from zero after having confirmed first header area 16.Whenever counter 60 has calculated a specific byte number, represent that just next header area 16 is approaching, mask signal must be removed.Therefore, signal detection module 54 periodically sends this mask signal at 16 places, non-header area according to the count results of counter 60.First logic unit 56 and second logic unit 58 are able to be shielded in wrong CP1 ' and the CP2 ' that recording areas 18 places send according to this mask signal.Signal detection module 54 produces the sequential of mask signal shown in Fig. 4 mask signal one.
Yet when counter 60 counting clock shakinesses, or first header area 16 identifications are when making a mistake, and the practice of Fig. 4 specific embodiment one can the related identification that has influence on follow-up to all header areas.Second the problem that can avoid Fig. 4 specific embodiment one of the specific embodiment of Fig. 4.According to Fig. 4 specific embodiment two, after MP between first shielded area finished, signal detection module 54 turned back to original state IS at once.When detecting the first header signal CP1, the second header signal CP2 and this address mark signal again simultaneously, just enter shielding status MS once again.If signal detection module 54 returns after the original state IS, only detect the first header signal CP1 and the second header signal CP2, and do not receive this address mark signal, then signal detection module 54 will remain on original state IS.Present embodiment produces the sequential chart of mask signal shown in Fig. 4 mask signal two.
Though specific embodiment two can improve CD-ROM drive when reading this optical storage media, to the correctness of header area 16 identifications.But Fig. 4 specific embodiment two also has its shortcoming sometimes.Because CD-ROM drive when reading this optical storage media, does not send this address mark signal sometimes.Near these did not send the header area 16 of address mark signal, CD-ROM drive might be subjected to wrong CP1 ' and CP2 ' influence, and can't reach the function of correctly pointing out header area 16 in Fig. 4 specific embodiment two.
The present invention proposes the method for another specific embodiment to solve the problem of specific embodiment two.Signal detection module 54 after entering the shielding status MS first time, in a certain specific interval number, remains on shielding status MS earlier according to specific embodiment one.This therebetween in, though signal detection module 54 only receives the first header signal CP1 and the second header signal CP2 and do not receive this address mark signal, still remain on shielding status MS.When signal detection module 54 did not receive this address mark signal yet when having surpassed this specific interval number, signal detection module 54 just setting between the shielded area of this specific interval number after MP finishes, was got back to original state IS.Again detect the first header signal CP1, the second header signal CP2 and this address mark signal simultaneously up to signal detection module 54, just enter shielding status MS once again.
For instance, ask for an interview the specific embodiment three of Fig. 4.The specific interval number of supposing signal detection module 54 is two.After having confirmed first header area 16,, still remain on shielding status MS though do not receive the address mark signal of second header area 16.But after MP finishes between second time shielded area,, then after MP finishes between the shielded area for the third time, get back to original state IS if do not receive this address mark signal of the 3rd header area 16 as yet.Among Fig. 4, get back to the time of original state IS and represent with time shaft T1.
Signal detection module 54 just enters shielding status MS next time when detecting the first header signal CP1, the second header signal CP2 and this address mark signal again simultaneously.The mask signal that this embodiment produces is shown in Fig. 4 mask signal three.
Since according to the specification of DVDRAM, the header area 16 that in this specific interval number, is missed, if therefore cause the read error of data, can be by the error correcting routine correction of CD-ROM drive.Therefore, can not resemble specific embodiment one, in the clock shakiness, because the erroneous section that causes surpasses the amount that the error correcting routine of CD-ROM drive can revise too much and directly causes the data decoding mistake.Therefore, according to Fig. 4 specific embodiment three, as long as the header area number that sends address mark signal is not less than this specific interval number, then CD-ROM drive all can be correct picks out header area 16.Fig. 4 specific embodiment three has not only been avoided the problem of specific embodiment two, also can further improve the identification accuracy of CD-ROM drive to header area 16.For implementing specific embodiment three, Fig. 3 optics judgement system 50 can further comprise a counter (not being shown in Fig. 3), in order to calculate this specific interval number.Below how explanation optics judgement system 50 is used this counter and is implemented Fig. 4 specific embodiment three.See also Fig. 5.Fig. 5 is the flow chart of steps of three optics determination methods of Fig. 4 specific embodiment.
This optics determination methods comprises the following step:
Step S30: beginning;
Step S32: receive the folded light beam of reflection from this optical storage media;
Step S34: produce the first header signal CP1, the second header signal CP2 and this address mark signal according to the folded light beam reflection position;
Step S36: when occurring the first header signal CP1, the second header signal CP2 and this address mark signal in succession, differentiate folded light beam and be reflection from the header area one of 16;
Step S38: transfer signal detection module 54 to shielding status MS by original state IS, and produce a corresponding mask signal, the length of this mask signal is MP between a shielded area;
Step S40: after MP finished between the shielded area, signal detection module 54 detected whether detect the first header signal CP1, the second header signal CP2 and this address mark signal simultaneously, if then this counter makes zero, otherwise this counter adds one;
Step S42: whether the value of checking this counter has reached a setting value, is 2 in the present embodiment.
If then signal detection module 54 is got back to original state IS, continue step S36, otherwise carry out step S40;
Step S44: signal detection module 54 remains on shielding status MS, repeating step S40.。
The invention provides a kind of optics judgement system and method thereof, whether reflect several header areas from light memory medium in order to differentiate a folded light beam.This optics judgement system comprises a beam detection module and a signal detection module.When one the first record position reflex time of a folded light beam, produce first header signal by this header area.When one the second record position reflex time of folded light beam, produce second header signal by the header area.When having an address information in the folded light beam, produce an address mark signal.When receiving this first header signal and this second header signal in succession, and when receiving this address mark signal during this period, differentiating this folded light beam is that reflection is from one of these header areas.
Compared to prior art, the present invention utilizes first header signal, second header signal and address mark signal to differentiate the header area simultaneously, can reduce because of the first wrong header signal, second header signal and cause the header area to differentiate the wrong situation that causes read error.The present invention also passes through to produce mask signal, further first header signal, second header signal of mistake is covered, and reduces the purpose of disturbing to reach.
By the detailed description of above-mentioned preferred specific embodiment, hope can be known description feature of the present invention and spirit more, and is not to come category of the present invention is limited with above-mentioned disclosed preferred specific embodiment.
On the contrary, its objective is that hope can contain in the category of claim of being arranged in of various changes and tool equality institute of the present invention desire application.
Claims (23)
1. optics judgement system, be used to differentiate a folded light beam and whether reflect a plurality of header areas (header) on an optical storage media, this folded light beam system is emitted by an optical read-write device, and via the reflection of this optical storage media and produce, respectively this header area comprises one first record position and one second record position to write down an address information, and this optics judgement system comprises:
A beam detection module is in order to receive this folded light beam; Wherein
When this folded light beam is by this first record position reflex time, produce one first header signal;
When this folded light beam is by this second record position reflex time, produce one second header signal; And
When having this address information in this folded light beam, produce an address mark signal; And
A signal detection module is used for
Receive this first header signal, this second header signal and this address mark signal;
Wherein ought receive this first header signal and this second header signal in succession, and when receiving this address mark signal during this period, differentiating this folded light beam is that reflection is from one of these header areas.
2. optics judgement system as claimed in claim 1, wherein this signal detection module has an original state and a shielding status, when this signal detection module is preset in this original state, when this signal detection module receives this first header signal and this second header signal in succession, and when receiving this address mark signal during this period, differentiate this folded light beam and be reflection from one of these header areas, this signal detection module also is converted to this shielding status by this original state.
3. optics judgement system as claimed in claim 2 wherein when this signal detection module is in this shielding status, can produce this first header signal and this second header signal that a mask signal receives with shelter.
4. optics judgement system as claimed in claim 3 further comprises a counter (counter), is used to calculate the length between a shielded area of this mask signal.
5. optics judgement system as claimed in claim 4, wherein the length between this shielded area is unit of account with byte (byte), the calculating of can starting from scratch of this counter, when counter calculates one first special value, begin between this shielded area, after counting down to one second special value, finish between this shielded area.
6. optics judgement system as claimed in claim 5, the distance between this first special value and this second special value wherein is the length between this header area respectively.
7. optics judgement system as claimed in claim 5, wherein this signal detection module periodically sends this mask signal under this shielding status.
8. optics judgement system as claimed in claim 5, wherein work as this signal detection module and receive this first header signal and this second header signal in succession, and when during this, receiving this address mark signal, this counter can be reset to a special value.
9. optics judgement system as claimed in claim 5, wherein when finishing between this shielded area, this signal detection module can be converted to this original state.
10. optics judgement system as claimed in claim 5, wherein when this signal detection module after finishing between this shielded area, when not receiving this address mark signal, then continue to remain on this shielding status.
11. optics judgement system as claimed in claim 10, wherein this signal detection module keeps this shielding status in a specific interval number, when not receiving this address mark signal yet above this specific interval number, this signal detection module turns back to this original state.
12. optics judgement system as claimed in claim 11 further comprises a counter, in order to calculate this specific interval number.
13. optics judgement system as claimed in claim 3, wherein this signal detection module further comprises one first logic unit, in order to receive this first header signal and this mask signal, and when receiving this first header signal and this mask signal simultaneously, then cover this first header signal.
14. optics judgement system as claimed in claim 3, wherein this signal detection module further comprises one second logic unit, in order to receive this second header signal and this mask signal, and when receiving this second header signal and this mask signal simultaneously, then cover this second header signal.
15. optics method of discrimination, be used to differentiate a folded light beam and whether reflect a plurality of header areas (header) on an optical storage media, this folded light beam is emitted by an optical read-write device, and via the reflection of this optical storage media and produce, respectively this header area comprises one first record position and one second record position to write down an address information, and this optics method of discrimination may further comprise the steps:
Receive the folded light beam of this reflection from this optical storage media;
When this folded light beam is by this first record position reflex time, produce one first header signal;
When this folded light beam is by this second record position reflex time, produce one second header signal;
When having this address information in this folded light beam, produce an address mark signal; And
When occurring this first header signal and this second header signal in succession, and when this address mark signal also occurring during this period, differentiating this folded light beam is that reflection is from one of these header areas.
16. optics method of discrimination as claimed in claim 15, further comprise a signal detection module, wherein this signal detection module has an original state and a shielding status, when this signal detection module is preset in this original state, when this signal detection module receives this first header signal and this second header signal in succession, and when receiving this address mark signal during this period, differentiate this folded light beam and be reflection from one of these header areas, this signal detection module also is converted to this shielding status by this original state.
17. optics method of discrimination as claimed in claim 16 wherein when this signal detection module is in this shielding status, then can produce this first header signal and this second header signal that a mask signal receives with shelter.
18. optics method of discrimination as claimed in claim 17, wherein when this signal detection module received this first header signal and this mask signal simultaneously, this mask signal can cover this first header signal; When this signal detection module received this second header signal and this mask signal simultaneously, this mask signal can cover this second header signal.
19. optics method of discrimination as claimed in claim 17, wherein the length of this mask signal activation (Active) is between a shielded area.
20. optics method of discrimination as claimed in claim 17, wherein this signal detection module periodically sends this mask signal under this shielding status.
21. optics method of discrimination as claimed in claim 19, wherein when finishing between this shielded area, this signal detection module can be converted to this original state.
22. optics method of discrimination as claimed in claim 19, when this signal detection module after finishing between this shielded area, during receiving this first header signal or this second header signal, when not receiving this address mark signal, continue to remain on this shielding status.
23. optics method of discrimination as claimed in claim 22, wherein this signal detection module keeps this shielding status in a specific interval number, when not receiving this address mark signal yet above this specific interval number, this signal detection module turns back to this original state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031543332A CN1300776C (en) | 2003-08-15 | 2003-08-15 | System and method for discriminating optical storage medium recording area |
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| CNB031543332A CN1300776C (en) | 2003-08-15 | 2003-08-15 | System and method for discriminating optical storage medium recording area |
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| KR100261196B1 (en) * | 1991-12-02 | 2000-07-01 | 이데이 노부유끼 | Apparatus for using window signal generators to enable detection of header information such as an address mark |
| JP3724168B2 (en) * | 1998-02-03 | 2005-12-07 | 三菱電機株式会社 | Status detection device and optical disk device |
| JP3999881B2 (en) * | 1998-07-14 | 2007-10-31 | 株式会社東芝 | Optical disc apparatus and control circuit thereof |
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