CN1932998B - Apparatus and method for identifying optical disc kinds - Google Patents
Apparatus and method for identifying optical disc kinds Download PDFInfo
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- CN1932998B CN1932998B CN2005101024856A CN200510102485A CN1932998B CN 1932998 B CN1932998 B CN 1932998B CN 2005101024856 A CN2005101024856 A CN 2005101024856A CN 200510102485 A CN200510102485 A CN 200510102485A CN 1932998 B CN1932998 B CN 1932998B
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Abstract
A equipment and method for distinguish the type of the compact dist (CD): puts the CD into the CD-ROM and read a radio-frequency signal of the CD; uses a band-pass filter that the wobble frequency is as the central, searches a band-pass signal of the radio-frequency signal; estimates the band-pass signal whether or not accord with a wobble signal, decides the CD is writeable if it is, otherwise it is read-only CD.
Description
Technical field
The invention relates to a kind of optical disc apparatus, and particularly relevant for a kind of device and method of identifying optical disc kinds.
Background technology
CD can store lot of data, and is of value to the advantage of preservation, so manufacturer also is devoted to develop various CDs, with in response to various storage requirements.
CD can be divided into read-only disc approximately at present and can write CD.Read-only disc for example is CD-ROM, DVD-ROM; CD be can write and CD-R, CD-RW, DVD-R/RW, DVD+R/RW or the like for example are.After general CD was inserted CD-ROM drive, CD-ROM drive needed the kind of identification CD, to do further processing, for example was to adjust readout power, Writing power and optimum speed or the like.
The general mode of differentiating disc types is to utilize the reflectivity of optical disc surface, because the material difference of various CDs.Yet the employed dyestuff that only can write CD just has very multiple, and the material of read-only disc also has several, and the surface reflectivity otherness of various materials is big, therefore is difficult for the correct kind of differentiating CD according to surface reflectivity.
Summary of the invention
In view of this, purpose of the present invention is providing a kind of device and method that utilizes spiral grooves (groove) to differentiate disc types exactly.
According to purpose of the present invention, a kind of method of identification one disc types is proposed.At first insert CD in CD-ROM drive, and read a radiofrequency signal of CD.Then, utilizing with a wobble frequency (wobble frequency) is a bandpass filter at center, a bandpass signal of retrieval radiofrequency signal.Then, judging whether bandpass signal meets with a wig-wag signal (wobble signal), if determine that then CD is to write CD, otherwise is read-only disc.
According to another object of the present invention, a kind of CD-ROM drive is proposed, be that a read-only disc or can write CD in order to differentiate a CD.CD-ROM drive comprises optical read head, in order to read a radiofrequency signal of this CD; First bandpass filter, its centre frequency are to be a wobble frequency, to retrieve one first bandpass signal of this radiofrequency signal; Judging unit judges whether this first bandpass signal meets with a wig-wag signal (wobblesignal), if determine that then CD is to write CD, otherwise is read-only disc.
Description of drawings
Figure 1A and Figure 1B illustrate the track synoptic diagram that is respectively read-only disc and can writes the formula CD;
Fig. 2 A is a kind of CD-ROM drive calcspar according to first embodiment of the invention.
Fig. 2 B illustrates and is the signal waveforms in the CD-ROM drive;
Fig. 3 is the method flow diagram according to a kind of identifying optical disc kinds of the present invention one second embodiment;
Fig. 4 A or Fig. 4 B illustrate the spectrogram of the bandpass signal that is respectively the tool wig-wag signal and do not have the spectrogram of bandpass signal of wig-wag signal;
Fig. 5 is the method flow diagram according to a kind of identifying optical disc kinds of third embodiment of the invention.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and cooperation institute accompanying drawing are described in detail below:
Can write the formula CD is different with the addressing mode (Physical Address) of read-only disc on physical format.Can write the formula CD is to have spiral grooves (groove), and it is the radially slightly swing along CD.Detect this amplitude of fluctuation and can draw wig-wag signal (wobble signal), it is to be recorded in CD in advance, for example is information, addressing information of relevant CD etc.; And read-only disc does not have the spiral rill.Therefore can utilize spiral grooves to decide the kind of CD.
Please refer to Figure 1A and Figure 1B, it illustrates the track synoptic diagram that is respectively read-only disc and can writes the formula CD.In Figure 1A, the track of read-only disc 100 (track) is made up of 101 of the continuous pits (pits) at pre-quarter, with record data.In Figure 1B, can write the spiral grooves (groove) that formula CD 150 has pre-quarter, it is the radially slightly swing along CD.Pit 151 in the track is that record data are in spiral grooves.
CD for DVD+R/RW, its physical addressing is to be called ADIP (Address In Pre-groove), utilize the phase shift key to send that (phase shiftedkeying, PSK) modulation mode, its modulation frequency are that 817KHz is to be recorded in optical disc information in the spiral grooves.When CD turned round so that n is doubly fast, sampling frequency was to be n*817KHz, with the sampling wig-wag signal (wobblesignal) that spiral grooves was write down.
For the CD of DVD-R/RW, its physical addressing is to be called PPIT (LandPre-pits), and it is to utilize the frequency modulating mode, and its modulation frequency is 140KHz, with recording disk information in spiral grooves.When CD turned round so that n is doubly fast, sampling frequency was to be n*140KHz, with the sampling wig-wag signal that spiral grooves was write down.
For the CD of CD-R/RW, it utilizes the carrier wave of modulation frequency 22KHz, with recording disk information in spiral grooves.When CD turned round so that n is doubly fast, sampling frequency was to be n*22KHz, with the sampling wig-wag signal that spiral grooves was write down.
Fig. 2 A is a kind of CD-ROM drive calcspar according to first embodiment of the invention.CD-ROM drive 200 is can whether exist according to wig-wag signal and determine the kind of CD.CD-ROM drive 200 comprises optical read head 210, bandpass filter 220 and judging unit 230.Optical read head 210 is in order to reading CD, and output radiofrequency signal RF.Bandpass filter 220 is to filter radiofrequency signal RF to export a bandpass signal B.Then, judging unit 230 judges whether bandpass signal B conforms to wig-wag signal, is to have spiral grooves if then represent this CD, just for can write the formula CD, otherwise is read-only disc.
Judging unit 230 can use the frequency spectrum of bandpass signal B to judge whether it conforms to wig-wag signal, or uses the cycle of bandpass signal B and judge whether to conform to wig-wag signal.
Please refer to Fig. 2 B, it illustrates and is the signal waveforms in the CD-ROM drive 200.After the radiofrequency signal RF process bandpass filter 220 of optical read head 210 outputs, be to produce bandpass signal B.The centre frequency of bandpass filter 220 is to be set at 22kHz, 140kHz or 817kHz.If bandpass signal B is wig-wag signal, then it has the waveform as the bandpass signal B1 in left side, otherwise has the waveform as the bandpass signal B2 on right side.
Judge whether that with the cycle of bandpass signal B the mode that conforms to wig-wag signal is as follows.Bandpass signal B can utilize sluggish cutter (Hysteresis Slicer) (not being shown among the figure) in the judging unit 230 with after it digitizing, detects its cycle.Bandpass signal B is through behind the sluggish cutter, be output digital band pass signal Bd: corresponding to the digital band pass signal Bd1 of the bandpass signal B1 of tool wig-wag signal, it is to have the single cycle, the digital band pass signal Bd2 of bandpass signal B2 of wig-wag signal of not having does not then have the single cycle, so can judge according to the cycle of digital band pass signal Bd whether CD has wig-wag signal, and judge that according to this its kind is for can write formula or read-only.
Judge whether that with the frequency spectrum of bandpass signal B the mode that conforms to wig-wag signal is as follows.If bandpass signal B is enough big in the intensity of the composition of wobble frequency, for example greater than an intensity threshold value, can judge that then bandpass signal B conforms to wig-wag signal, otherwise for not conforming to.
Fig. 3 is the method flow diagram according to a kind of identifying optical disc kinds of the present invention one second embodiment.At first, judge that in step 301 CD is CD or DVD: if CD then enters step 310, if DVD then enters step 320.In step 310, the centre frequency of setting bandpass filter 220 is n*22kHz, and wherein n is the multiple for the CD running.Then, in step 312, the bandpass signal B of reception bandpass filter 220 outputs.Then, in step 314, check in the frequency content of bandpass signal B, whether based on n*22kHz, if can assert that then bandpass signal B is wig-wag signal, that is to say that CD is to have spiral grooves, is for writing formula cd cd-R/RW (step 316) therefore; Otherwise CD is to be read-only CD (step 318).
In the step of judging the DVD disc types, at first, the centre frequency of setting bandpass filter 220 is n*817kHz, and shown in step 320, wherein n is the multiple for the CD running.Then, in step 322, the bandpass signal B of reception bandpass filter 220 outputs.Then, in step 324, check in the frequency content of bandpass signal B, whether based on n*817kHz, if can assert that then bandpass signal B is wig-wag signal, that is to say that CD is to have spiral grooves, is for writing formula CD DVD+R/RW (step 326) therefore; Otherwise carry out step 330.
In step 330, the centre frequency of setting bandpass filter 220 is n*140kHz, and shown in step 320, wherein n is the multiple for the CD running.Then, in step 332, the bandpass signal B of receiving belt pass filter 220 outputs.Then, in step 334, check in the frequency content of bandpass signal B, whether based on n*140kHz, if can assert that then bandpass signal B is wig-wag signal, that is to say, therefore CD is to have spiral grooves, be for can writing formula CD DVD-R/RW (step 336), otherwise this CD is to be read-only DVD (step 338).
The second above-mentioned embodiment directly judges the frequency of bandpass signal B and determines whether it is wig-wag signal, so its frequency may be mingled with other frequency content make judge accurate inadequately.The present invention reintroduces one the 3rd embodiment in addition and whether has wig-wag signal with more accurate decision bandpass signal B.
Please refer to Fig. 4 A or Fig. 4 B, it illustrates spectrogram of the bandpass signal B1 that is respectively the tool wig-wag signal and does not have the spectrogram of bandpass signal B2 of wig-wag signal.In Fig. 4 A, wig-wag signal with n*140kHz is an example, the intensity I 1 of the frequency content of bandpass signal B1 behind n*140kHz of this wig-wag signal of tool can decay, that is to say, the intensity I 1 (140) of n*140kHz add the intensity I 1 (145) of n*145kHz and be greater than the intensity I 1 (150) at n*150kHz add the intensity I 1 (155) of n*155kHz and: I1 (140)+I1 (145)＞I1 (150)+I1 (155).
Among Fig. 4 B, not the intensity I 2 of the frequency content before and after the n*140kHz of the bandpass signal B2 of this wig-wag signal of tool be about identical, I2 (140)+I2 (145)～I2 (150)+I2 (155) just.Therefore can judge whether bandpass signal B has wig-wag signal by this attenuation characteristic.
Fig. 5 is the method flow diagram according to a kind of identifying optical disc kinds of third embodiment of the invention.At first, judge that in step 501 CD is CD or DVD: if CD then enters step 510, if DVD then enters step 520.In step 510, the centre frequency of setting bandpass filter 220 respectively in regular turn is Hc, Hc+ δ, Hc+2 δ, Hc+3 δ, wherein Hc is n*22kHz, n is the multiple for the CD running, off-set value δ for example is n*1kHz, and bandpass signal Ba, Bb, Bc, the Bd of reception bandpass filter 220 outputs accordingly.Then, in step 512, whether check I (Ba)+I (Bb)＞I (Bc)+I (Bd), if, can assert that then CD is to have spiral grooves, be therefore for writing formula cd cd-R/RW (step 514); Otherwise CD is to be read-only CD (step 516).It should be noted that in the step 510 it is that bandpass filter 220 is set four centre frequencies, so be not limited to four, visual actual conditions and increase or reduce.
In step 520, the centre frequency of setting bandpass filter 220 respectively in regular turn is Hd, Hd+ δ, Hd+2 δ, Hd+3 δ, wherein Hd is n*817kHz, n is the multiple for the CD running, off-set value δ for example is n*20kHz, and bandpass signal Be, Bf, Bg, the Bh of reception bandpass filter 220 outputs accordingly.Then, in step 522, whether check I (Be)+I (Bf)＞I (Bg)+I (Bh), if, can assert that then CD is to have spiral grooves, therefore be for can writing formula CD DVD+R/RW (step 524), otherwise enter in the step 530.It should be noted that in the step 520 it is that bandpass filter 220 is set four centre frequencies, so be not limited to four, visual actual conditions and increase or reduce.
In step 530, the centre frequency of setting bandpass filter 220 respectively in regular turn is Hv, Hv+ δ, Hv+2 δ, Hv+3 δ, wherein Hv is n*140kHz, n is the multiple for the CD running, off-set value δ for example is n*5kHz, and bandpass signal Bi, Bj, Bm, the Bn of reception bandpass filter 220 outputs accordingly.Then, in step 532, whether the intensity of these a little bandpass signals relatively check I (Bi)+I (Bj)＞I (Bm)+I (Bn), if, can assert that then CD is to have spiral grooves, be therefore for writing formula CD DVD-R/RW (step 534); Otherwise CD is to be DVD-ROM (step 536).It should be noted that in the step 530 it is that bandpass filter 220 is set four centre frequencies, so be not limited to four, visual actual conditions and increase or reduce.
The device and method of the disclosed identifying optical disc kinds of the above embodiment of the present invention can be judged the kind of CD more accurately according to wig-wag signal.
In sum; though the present invention discloses as above with a preferred embodiment; right its is not in order to limit the present invention; anyly have the knack of this skill person; without departing from the spirit and scope of the present invention; when can being used for a variety of modifications and variations, so protection scope of the present invention is when looking being as the criterion that the accompanying Claim protection domain defined.
Claims (14)
1. the method for identification one disc types is characterized in that, comprising:
Insert this CD in a CD-ROM drive;
Read a radiofrequency signal of this CD;
Utilization is a bandpass filter at center with a wobble frequency, retrieves one first bandpass signal of this radiofrequency signal; And
Judge whether this bandpass signal meets with a wig-wag signal, if determine that then this CD is one can write CD, otherwise be a read-only disc, wherein the frequency of this wig-wag signal is this wobble frequency, comprise more in this determining step that wherein the centre frequency of setting this bandpass filter adds one first side-play amount for this wobble frequency, to retrieve one second bandpass signal of this radiofrequency signal, wherein this side-play amount is less than this wobble frequency; According to the intensity of this first bandpass signal and the intensity of this second bandpass signal, judge whether this first bandpass signal is this wig-wag signal, if the intensity of this first bandpass signal judges then that greater than the intensity of this second bandpass signal this first bandpass signal is this wig-wag signal.
2. the method for claim 1 is characterized in that, more comprises:
The centre frequency of setting this bandpass filter adds one second side-play amount for this wobble frequency, to retrieve one the 3rd bandpass signal of this radiofrequency signal;
The centre frequency of setting this bandpass filter adds one the 3rd side-play amount for this wobble frequency, to retrieve a four-tape messenger of this radiofrequency signal;
Wherein above-mentioned determining step be with one first intensity of this first bandpass signal and the 3rd bandpass signal and, one second intensity and comparison with this second bandpass signal and this four-tape messenger, if this first intensity and greater than this second intensity and, judge that then this first bandpass signal is this wig-wag signal.
3. the method for claim 1 is characterized in that, wherein this wobble frequency is to be n*817KHz, and wherein n is doubly fast for the rotation of this CD, if this first bandpass signal is to be this wig-wag signal, then this CD is to be DVD+R/RW.
4. the method for claim 1 is characterized in that, wherein this wobble frequency is to be n*140KHz, and wherein n is doubly fast for the rotation of this CD, if this first bandpass signal is to be this wig-wag signal, then this CD is to be DVD-R/RW.
5. the method for claim 1 is characterized in that, wherein this wobble frequency is to be n*22KHz, and wherein n is doubly fast for the rotation of this CD, if this first bandpass signal is to be this wig-wag signal, then this CD is to be CD-R/RW.
6. the method for claim 1 is characterized in that, in the determining step, is to determine with the cycle of this first bandpass signal and this wig-wag signal whether both meet wherein.
7. the method for claim 1 is characterized in that, in the determining step, is to determine with the spectrum component of this first bandpass signal and this wig-wag signal whether both meet wherein.
8. a CD-ROM drive is that a read-only disc or can write CD in order to differentiate a CD, it is characterized in that, comprising:
One optical read head is in order to read a radiofrequency signal of this CD;
One first bandpass filter, its centre frequency are to be a wobble frequency, to retrieve one first bandpass signal of this radiofrequency signal; And
One judging unit, judge whether this first bandpass signal meets with a wig-wag signal, if then determine this CD can write CD for this, otherwise be this read-only disc, wherein the frequency of this wig-wag signal is this wobble frequency, wherein this judging unit is that the centre frequency of setting this bandpass filter adds one first side-play amount for this wobble frequency, and to retrieve one second bandpass signal of this radiofrequency signal, wherein this side-play amount is less than this wobble frequency; This judging unit is according to the intensity of this first bandpass signal and the intensity of this second bandpass signal, judge whether this first bandpass signal is this wig-wag signal, when the intensity of this first bandpass signal intensity, judge that then this first bandpass signal is this wig-wag signal greater than this second bandpass signal.
9. CD-ROM drive as claimed in claim 8 is characterized in that, wherein this judging unit is to determine with the cycle of this first bandpass signal and this wig-wag signal whether both meet.
10. CD-ROM drive as claimed in claim 8 is characterized in that, wherein this judging unit is to determine with the spectrum component of this first bandpass signal and this wig-wag signal whether both meet.
11. CD-ROM drive as claimed in claim 8 is characterized in that, wherein this judging unit centre frequency of setting this bandpass filter adds one second side-play amount for this wobble frequency, to retrieve one the 3rd bandpass signal of this radiofrequency signal;
The centre frequency of setting this bandpass filter adds one the 3rd side-play amount for this wobble frequency, to retrieve a four-tape messenger of this radiofrequency signal;
Wherein this judging unit be with one first intensity of this first bandpass signal and the 3rd bandpass signal and, one second intensity and comparison with this second bandpass signal and this four-tape messenger, if this first intensity and greater than this second intensity and, judge that then this first bandpass signal is this wig-wag signal.
12. CD-ROM drive as claimed in claim 8 is characterized in that, wherein this wobble frequency is to be n*817KHz, and wherein n is doubly fast for the running of this CD-ROM drive, if this first bandpass signal is to meet with this wig-wag signal, then this CD is to be DVD+R/RW.
13. CD-ROM drive as claimed in claim 8 is characterized in that, wherein this wobble frequency is to be n*140KHz, and wherein n is doubly fast for the running of this CD-ROM drive, if this first bandpass signal and this wig-wag signal meet, then this CD is to be DVD-R/RW.
14. CD-ROM drive as claimed in claim 8 is characterized in that, wherein this wobble frequency is to be n*22KHz, and wherein n is doubly fast for the running of this CD-ROM drive, if this first bandpass signal and this wig-wag signal meet, then this CD is to be CD-R/RW.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005101024856A CN1932998B (en) | 2005-09-14 | 2005-09-14 | Apparatus and method for identifying optical disc kinds |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2005101024856A CN1932998B (en) | 2005-09-14 | 2005-09-14 | Apparatus and method for identifying optical disc kinds |
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| CN1932998A CN1932998A (en) | 2007-03-21 |
| CN1932998B true CN1932998B (en) | 2010-12-22 |
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| CN2005101024856A Expired - Fee Related CN1932998B (en) | 2005-09-14 | 2005-09-14 | Apparatus and method for identifying optical disc kinds |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1186774C (en) * | 2000-09-22 | 2005-01-26 | 索尼公司 | CD driver and mehtod for distinguishing the CD mounted on the same |
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- 2005-09-14 CN CN2005101024856A patent/CN1932998B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1186774C (en) * | 2000-09-22 | 2005-01-26 | 索尼公司 | CD driver and mehtod for distinguishing the CD mounted on the same |
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| CN1932998A (en) | 2007-03-21 |
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Granted publication date: 20101222 Termination date: 20110914 |