CN102385890A

CN102385890A - Disk judging method

Info

Publication number: CN102385890A
Application number: CN2010102752315A
Authority: CN
Inventors: 刘安特; 黄识忠
Original assignee: Quanta Storage Inc
Current assignee: Quanta Storage Inc
Priority date: 2010-09-06
Filing date: 2010-09-06
Publication date: 2012-03-21
Anticipated expiration: 2030-09-06
Also published as: CN102385890B

Abstract

The invention relates to a disk judging method, which comprises the following steps of: focusing in a disk rewritable zone; reading a disk data mark EFM (Eight-to-Fourteen Modulation) signal; checking whether a disk is a data disk or a blank disk, wherein the disk is judged as the data disk by a SBAD (Sub-beam Added Signal) signal and is judged as the blank disk by a DPD (Differential Phase Detection) signal of the disk; and then checking a header signal, judging the disk as a DVD-RAM (Digital Video Disk-Random Access Memory) disk if the header signal exists and judging the disk as a DVD-RW (Digital Versatile Disk ReWritable) disk if the header signal does not exist so as to improve the correctness of judging the disk.

Description

The identifying disk method

Technical field

The relevant a kind of identifying disk method of the present invention during especially about disc player read-write disc, is the method for DVD-RAM type or DVD-RW type in order to differentiate disc.

Background technology

Disc can be divided into different sizes such as CD, VCD, DVD and BD according to different storage volumes; Also can be divided into read-only type (ROM), a burning type (R), can override type (RW) and erasable type dissimilar discs such as (RAM) according to the demand of repetitive read-write.The optical characteristics of disc can change along with different storage volumes and type, and disc player must be differentiated the type of disc earlier, and the adjustment servo parameter just can effectively be read and write disc.

Wherein erasable type disc, the specification of for example erasable Video CD (Digital VideoDisk-Random Access Memory is called for short DVD-RAM) is comparatively complicated with respect to other kind disc.As shown in Figure 1, be DVD-RAM disc data structural representation.DVD-RAM disc 10 surfaces mark off embossment district (Embossed Zone) 11 and burning district (Rewritable Zone) 12.Wherein, embossment district 11 is positioned at the inner ring of DVD-RAM disc 10, in order to the information of disc to be provided, for example: the amount of capacity of disc, type etc.In addition, the periphery in embossment district 11 is burning district 12, and burning district 12 is in order to burning user data (USER DATA).DVD-RAM disc 10 is to utilize in the burning district 12 header (header) 13 to divide a plurality of sections with the most tangible different characteristic of other disc, so that divide section burning user data.Header 13 has higher light reflectivity, and the physical location (physical address) in order to store each sector data makes DVD-RAM disc 10 to delete and to write data at random as hard disk.Therefore, when disc player is judged disk types, utilize the high light reflectivity signal of surveying header 13, as the foundation of differentiating DVD-RAM disc 10.

Yet blank DVD-RAM disc is because user data field reflectivity is more approaching with the header reflectivity, and the light reflected signal of the header that is not easily distinguishable is judged the DVD-RAM disc by accident easily and do not become the DVD-RW disc, follow-up the disc read-write motion made a mistake and cause.So prior art still has problem to need to be resolved hurrily differentiating on DVD-RAM and the DVD-RW disk types.

Summary of the invention

The object of the present invention is to provide a kind of identifying disk method, is data slice or blank through judge disc in advance, selects light aggregate signal or differential phae detection signal for use according to characteristic, declares sheet, with the correct decision disc.

In order to reach the purpose of aforementioned invention, identifying disk method of the present invention, the district focuses in the disc burning; Exist through reading disc data mark 8-14 modulation signal, the inspection disc is data slice or blank, and disc is that data slice then utilizes the light aggregate signal to differentiate disc; Disc is that blank then utilizes the differential phae detection signal of disc to differentiate disc; Reexamine the header signal, have the header signal to differentiate and be the DVD-RAM disc, do not have the header signal to produce then differentiating is the DVD-RW disc.Wherein to differentiate disc be the light aggregate signal that detects header and user data field in the burning district of disc to the light aggregate signal.And the differential phae detection signal to differentiate disc be to lock rail in advance, detect the differential phae detection signal of header and user data field in the burning district of disc again.During inspection header signal, a preset threshold value needs to surpass at least one section or a plurality of during the inspection, to exceed the header signal number that threshold value or calculating exceed predetermined threshold value, exists as inspection header signal.

Description of drawings

Fig. 1 is the synoptic diagram of DVD-RAM disc data structure.

Fig. 2 produces the synoptic diagram of SBAD signal for disc player.

Fig. 3 reads the SBAD signal that the DVD-RAM data slice produces for disc player.

Fig. 4 reads the SBAD signal that the DVD-RAM blank produces for disc player.

Fig. 5 (a) produces the synoptic diagram of DPD signal for disc player.

The synoptic diagram that Fig. 5 (b) forms for the DPD signal.

Fig. 6 is the synoptic diagram of DVD-RAM data slice partial data rail structure.

Fig. 7 is the DPD signal that reads the DVD-RAM data slice.

The DPD signal of reading of data sheet DVD-RAM disc when Fig. 8 squints for the lock rail.

Fig. 9 is the synoptic diagram of DVD-RAM blank partial data rail structure.

Figure 10 is the process flow diagram of identifying disk method of the present invention.

[main element label declaration]

10 DVD-RAM discs, 11 embossment districts

12 burning districts, 13 headers

20 disc players, 21 discs

22 optical read heads, 23 OPTICAL SENSORSs

24 first adders, 25 second adders

26 the 3rd totalizers, 31 user data field signals

32 header signals, 33 threshold values

54 first addition comparers, 55 second addition comparers

56 phase comparators, 60 track bars

61 grooves, 62 ditch banks

63 marks, 64 holes

65 luminous points, 66 center lines

67 header DPD signals, 68 user data field DPD signals

69 skew routes, 70 threshold values

Embodiment

Relevant the present invention is for reaching above-mentioned purpose, and technological means that is adopted and effect thereof are lifted preferred embodiment now, and cooperates graphic the explanation as follows.

Please refer to Fig. 2, produce the synoptic diagram of light aggregate signal for disc player.Disc player 20 comprises optical read head 22, OPTICAL SENSORS 23, first adder 24, second adder 25 and the 3rd totalizer 26 in order to the device that reads disc 21.When disc player 20 reads disc 21; Optical read head 22 sends a laser to disc 21 and receives the reflected light of disc 21; Be projected to OPTICAL SENSORS 23 (Photodetector); OPTICAL SENSORS 23 is divided into sensing area A, B, C, the D quartern, and the number that four sensing areas distinctly will receive luminous flux converts electric signal to, obtains signal A, signal B, signal C and signal D.Then signal produces signal (A+C) and signal (B+D) via first adder 24 and second adder 25 additions in twos.When signal (A+C) and signal (B+D) through the 3rd totalizer 26 with two signal plus after, promptly can produce a smooth aggregate signal (Sub-beam Added Signal is called for short the SBAD signal).

Please refer to like Fig. 3 and Fig. 4, Fig. 3 reads the SBAD signal that the DVD-RAM data slice is produced for disc player, and Fig. 4 reads the SBAD signal that the DVD-RAM blank produces for disc player.As shown in Figure 3, when disc player read disc, optical read head need be launched a laser focusing on disc.If this disc is the DVD-RAM data slice; Because disc burning district is burning user data; Can reduce the reflectivity of disc; This moment header high reflectance obviously greater than the reflectivity of user data field, it is higher and exceed the header signal 32 of SBAD signal predetermined threshold value 33 that therefore the lower user data field signal 31 of peak value and peak value can appear in detected SBAD signal.Be utilized in the data slice user data field signal 31 and header signal 32 notable differences, so as easy as rolling off a logly correctly be checked through the header signal and determine the data slice that disc is DVD-RAM.

Yet; As shown in Figure 4, when disc is the DVD-RAM blank, because of its user data field burning user data not as yet; Blank burning district has higher reflectivity equally; The reflectivity of the reflectivity of header and user data field is close at this moment, and user data field signal 31 and header signal 32 that blank SBAD signal occurs are more or less the same, and causing being difficult to going out the header signal by SBAD signal predetermined threshold value 33 correct decisions is the DVD-RAM blank to differentiate disc.Therefore the SBAD signal is applicable to and differentiates the DVD-RAM data slice.

Please be simultaneously with reference to figure 5 (a) and Fig. 5 (b), Fig. 5 (a) is the synoptic diagram of disc player generation differential phae detection signal, Fig. 5 (b) is the synoptic diagram that the differential phae detection signal forms.The signal that disc player 20 utilizes OPTICAL SENSORS 23A, B, C, four sensing areas of D to obtain equally.With clinodiagonal signal A and C through 55 additions of the second addition comparer and level ratio, produce phase signal S1 and phase signal S2 shown in Fig. 5 (b) via the first addition comparer 54 and signal B and D.After phase signal S1 and phase signal S2 subtract each other the phase place of two signals through phase comparator 56, form the phase signal (S1-S2) that subtracts each other, promptly can produce a differential phae and detect (Differential Phase Detection is called for short DPD) signal.

Please be simultaneously with reference to figure 6 and Fig. 7, Fig. 6 is the synoptic diagram of DVD-RAM data slice partial data rail structure, Fig. 7 is the DPD signal that reads the DVD-RAM data slice.By shown in Figure 6, the track bar 60 of DVD-RAM disc is made up of groove 61 (Groove) and ditch bank 62 (Land), and each burning section guides a user data field by header.The DVD-RAM disc not only can produce mark (Mark) 63 at groove 61 (Groove) burning data when burning data, also can produce mark 63 at ditch bank 62 (Land) record data.At header many pits 64 of compacting are in advance arranged, so that the physical location message of this burning section to be provided.

When reading the DVD-RAM data slice, the luminous point 65 of the projection of optical read head correctly pins track bar 60; And read the DVD-RAM disc along track bar 60 center lines 66, because the pit 64 of header only is located at a side of track bar 60 center lines 66 partially, for example during inclined to one side center line 66 upsides of pit 64; Sensing area (B+D) detects the pit of header earlier than sensing area (A+C), and phase signal S2 is a phase-lead signal, and it is big and phase signal S1 equals zero to form phase signal S2; Make the first half of DPD signal reach maximum phase signal; Otherwise during inclined to one side center line 66 downsides of pit 64, sensing area (A+C) detects the pit of header earlier than sensing area (B+D); Phase signal S1 is a phase-lead signal; It is big and phase signal S2 equals zero to form phase signal S 1, makes the Lower Half of DPD signal reach maximum phase signal, thereby produces the header signal 67 of big DPD signal among Fig. 7.When luminous point 65 continues when groove 61 or ditch bank 62 that track bar 60 center lines 66 get into the user data fields read the DVD-RAM data slice; Because of just passing through the center line 66 of mark 63; Both sides mark 63 symmetries; So that sensing area (A+C) is almost equal and that phase differential is approached is zero with (B+D) phase signal S1 and phase signal S2, produces the user data field signal 68 of less DPD signal.Therefore utilize DPD signal predetermined threshold value 70, check that very easily the header signal exists.

Please more simultaneously with reference to figure 6 and Fig. 8, Fig. 8 reads the DPD signal of DVD-RAM data slice when squinting for the lock rail.As shown in Figure 6; To produce off-centre or disc player servo etc. when unusual when disc; Optical read head can't move along normal orbit center line 66, and produces lock rail skew route 69, so that the pit 64 of header is distributed in the both sides of skew route 69; Sensing area (A+C) and phase signal S1 (B+D) and phase signal S2 phase differential are reduced, thereby produce less DPD signal header signal 67 among Fig. 7.But when reading user data field mark 63; Because of skew route 69 deflection marks 63 1 sides; So that as header, form obvious sensing area (A+C) and (B+D) phase signal S1 and phase signal S2 phase differential, produce the user data field signal 68 of big DPD signal.Thereby utilize DPD signal predetermined threshold value 70, be difficult to determine the header signal.Therefore; Utilize sensing area (A+C) and (B+D) phase signal S1 and phase signal S2 to subtract each other the DPD signal that is produced; To normal data slice DVD-RAM disc and disc player,, as easy as rolling off a logly receive the unusual DVD-RAM disc and the influence of disc player though can differentiate the DPD signal difference of header and user data field easily; Cause close difficult branch of DPD signal of header and user data field, so that produce the erroneous judgement disc.

As shown in Figure 9, Fig. 9 is the synoptic diagram of DVD-RAM blank partial data rail structure.For the DVD-RAM disc of blank, no abnormal no matter disc or disc player have, optical read head is along center line 66 or skew route 69; The pit 64 that the inclined to one side example of header is provided with; Still can make and utilize sensing area (A+C) and the phase signal S1 and the phase signal S2 of sensing area (B+D) to subtract each other the DPD signal that is produced, keep bigger signal, and in the user data field; Because of no mark exists; The reflectivity of skew route 69 both sides is symmetry equivalent, does not almost have the phase differential of phase signal S1 and phase signal S2 between sensing area (A+C) and the sensing area (B+D), produces the DPD signal that approaches zero user data field.And its signal is linear as Fig. 7, and just signal amplitude is slightly little, still can differentiate the DPD signal difference of DVD-RAM blank header and user data field easily.Utilize DPD signal predetermined threshold value, can check that the header signal exists.Therefore the DPD signal is applicable to and differentiates the DVD-RAM blank.

Whether it is to utilize the favourable correct decision DVD-RAM of aforementioned SBAD signal data slice that the present invention differentiates the disc method, and the characteristics of the favourable correct decision DVD-RAM of DPD signal blank, before declaring sheet, exist through reading disc data mark signal; Check that in advance disc is data slice or blank, the signal of this disc data mark, the 8-14 modulation signal (Eight-to-FourteenModulation of inspection data mark for example capable of using; Be called for short the EFM signal) whether exist, exist like the EFM signal, have the burning mark on the expression disc; It is exactly the data slice of burning data; Otherwise do not exist like the EFM signal, no burning mark is exactly a blank on the disc.After checking out data slice or blank, data slice just utilizes the SBAD signal to differentiate the disc method, utilizes SBAD signal predetermined threshold value, inspection header signal.Blank just utilizes the DPD signal to differentiate the disc method, utilizes DPD signal predetermined threshold value, and inspection header signal determining the DVD-RAM disc, otherwise is the DVD-RW disc, goes out disc with correct decision.

During inspection header signal, divide a plurality of sections because of the burning district utilizes header, each section has certain-length; For the sheet time is declared in minimizing, inspection header signal only need contain and cover at least one section; Need not detect all sections, therefore check the header signal during need to surpass at least one section.But, in order to improve the correctness of differentiating disc, need contain a plurality of sections of lid usually during the inspection header signal, and exceed the header signal number of predetermined threshold value with calculating, reach preset value, just confirm the existence of header signal.

Shown in figure 10, be the process flow diagram of identifying disk method of the present invention.The present invention utilizes the step-by-step procedures of SBAD signal or DPD signal differentiation disc following: get into step S1 and begin to differentiate the disc program; Follow at step S2 mobile optical read head to disc burning district; At step S3, optical read head focuses on disc; Get into step S4, whether utilization is read disc data mark signal and is existed, is the inspection disc data slice or blank disc? If disc is that data slice then gets into step S5, if disc is that blank then gets into step S6; At step S5,, then get into step S7 if disc is judged to data slice and then utilizes the SBAD signal to differentiate disc; At step S6, after identifying disk is blank, lock rail earlier, utilize the DPD signal to differentiate disc kind again; Does then at step S7, the DPD signal of inspection disc have the existence of header signal? If have the header signal to exist then getting into step S8 is the DVD-RAM disc with identifying disk, be the DVD-RW disc with identifying disk if do not have the header signal to exist then to get into step S9.

Therefore; Disc kind method of discrimination of the present invention; Can be through judging that earlier disc be data slice or blank, if disc is a blank, then locks rail and carry out the DPD signal check and have the header signal to exist? If disc is a data slice; Then utilize the SBAD signal check to have the header signal to exist? According to the differentiation of accomplishing disc kind that has or not of header signal, reach the purpose of correct decision DVD-RAM disc.

The above person, only in order to convenient explanation preferred embodiment of the present invention, scope of the present invention is not limited to these preferred embodiments, and is all according to any change that the present invention did, and in not breaking away under the spirit of the present invention, all belongs to the scope of claim of the present invention.

Claims

1. identifying disk method comprises:

(1) focuses in disc burning district;

Is (2) the inspection disc data slice or blank? If disc is that data slice then gets into step (3), if disc is that blank then gets into step (4);

(3) utilize the SBAD signal to differentiate disc, get into step (5) then;

(4) utilize the DPD signal of disc to differentiate disc; And

Does (5) inspection have the existence of header signal? Differentiation is the DVD-RAM disc if there is the header signal to exist then, is the DVD-RW disc if do not have the header signal to exist then to differentiate.

2. identifying disk method according to claim 1, wherein does this step (2) exist through reading disc data mark signal? Existing like signal, is exactly data slice, do not exist like signal, and be exactly blank.

3. identifying disk method according to claim 2, wherein the signal of this disc data mark is the EFM signal.

4. identifying disk method according to claim 1, wherein to differentiate disc be the light aggregate signal that detects header and user data field in the burning district of disc for this SBAD signal.

5. identifying disk method according to claim 1, wherein to differentiate disc be the differential phae detection signal that detects header and user data field in the burning district of disc for this DPD signal.

6. identifying disk method according to claim 1, wherein this step (4) is locked rail earlier before the DPD signal that utilizes disc is differentiated disc.

7. identifying disk method according to claim 1, wherein this step (5) predetermined threshold value exists to exceed threshold value inspection header signal.

8. identifying disk method according to claim 7, this predetermined threshold value wherein when utilizing the SBAD signal to differentiate disc, is SBAD signal predetermined threshold value, then is DPD signal predetermined threshold value when utilizing the DPD signal of disc to differentiate disc.

9. identifying disk method according to claim 7, wherein this step (5) burning district utilizes header to divide a plurality of sections, needs to surpass at least one section during the inspection header signal.

10. identifying disk method according to claim 9, wherein this inspection header signal exceeds the header signal number of predetermined threshold value with calculating, reaches preset value, just confirms the existence of header signal.