CN100437769C - Optical disk reading method - Google Patents
Optical disk reading method Download PDFInfo
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- CN100437769C CN100437769C CNB2005100037100A CN200510003710A CN100437769C CN 100437769 C CN100437769 C CN 100437769C CN B2005100037100 A CNB2005100037100 A CN B2005100037100A CN 200510003710 A CN200510003710 A CN 200510003710A CN 100437769 C CN100437769 C CN 100437769C
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Abstract
The present invention relates to an optical disk reading method, which reads an address of an optical disk by reading double speed. The method comprises that (a) an address is read according to an amplifying signal corresponding to the reading double speed, and the amplifying signal is a preset amplifying signal; (b) the success of reading is checked; if the reading is successful, the method ends; if the reading is not successful, step (c) is carried out; (c) the amplifying signal corresponding to the reading double speed is adjusted according to a reading error index value; (d) the address is reread according to the amplifying signal adjusted by the step (c); (e) the success of the reading is checked; if the reading is not successful, the step (c) is repeated.
Description
Technical field
The invention relates to a kind of read method, and particularly relevant for a kind of read method of discs.
Background technology
Please refer to Fig. 1, it illustrates is the calcspar of traditional optical read-write control system.Optical R/W control system 100 comprises optical read/write head (optical pickup head) 110, radio frequency balanced device (radio frequency equalizer) 120 and digital signal processing (Digital Signal Processing is hereinafter to be referred as DSP) unit 130 at least.DSP unit 130 comprises demoder 132 and error correction device 134.
When optical R/W control system 100 for example be with 52 times of speed read the data of an address that times fast reading gets discs 111 time, optical read/write head 110 is to discs 111 emission one laser light L and reads the radiofrequency signal RF 1 that is reflected by discs 111 and export radio frequency balanced device 120 to.Radio frequency balanced device 120 be according to 52 times of pairing amplifying signal AS of speed and corner frequency (cut off frequency) COF to radiofrequency signal RF 1 in addition after the processing and amplifying output radiofrequency signal RF 2 to demoder 132.Amplifying signal AS and corner frequency COF read doubly fast and set different predetermined values according to different before dispatching from the factory, and are recorded in the optical R/W control system 100.
Demoder 132 is that radiofrequency signal RF 2 is decoded, and output data DA 1 is to error correction device 134.When data DA 1 can see through 134 corrections of error correction device, error correction device 134 was that data DA 1 is revised, and corrected data DA 2 is sent to finish the action of reading of this address.
When data DA 1 can't be modified to data DA 2 via error correction device 134, traditional solution is to read doubly fast, amplifying signal AS and corner frequency COF reads again with identical by optical R/W control system 100 earlier at same address, if in the time of still can't correctly reading the data of the address of desiring to read after reading 6 times again, then optical R/W control system 100 for example is to reduce to 48 times of speed with reading doubly speed from 52 times of velocity modulations, and then read the data of this address again, till data is correctly read.
Yet, when radio frequency balanced device 120 according to reading doubly fast pairing amplifying signal AS and corner frequency COF to radiofrequency signal RF 1 in addition processing and amplifying the time, probably also will be among the radiofrequency signal RF 1 also amplify in the lump because of the not good noise that causes of burning quality and export demoder 132 decodings to, and then the data DA 1 that makes demoder 132 be exported be for the data of mistake and can't be modified to data DA 2 via error correction device 134.At this moment, if the disposal route during according to traditional data read error, read doubly with identical that speed, amplifying signal AS and corner frequency COF read again at same address, being present in then that noise among the radiofrequency signal RF 1 still can be exaggerated and be used as is data and decoding.Thus, read the required time of this address making optical R/W control system 100 still the data that is stored in this address correctly can't be read out, also can increasing.
Summary of the invention
Supervise in this, purpose of the present invention is providing a kind of read method exactly, can accurately and quickly the data that is stored on the relatively poor discs of burning quality be read out to promote the reading capability of CD player.
According to purpose of the present invention, a kind of read method of discs is proposed, be to read doubly speed and decipher a radiofrequency signal and the address of reading a discs with one, it is characterized in that this method comprises:
(a). reading doubly according to this, speed pairing one default amplifying signal reads this address;
(b). check whether to read success, if, method ends then; If not, then enter step (c);
(c). the number of times adjustment of successfully not reading according to this address should default amplifying signal be a correction amplifying signal;
(d). read this address again according to adjusted this correction amplifying signal of step (c); And
(e). check whether to read success, if not, repeating step (c) then.
Wherein step (c) is to adjust the amplitude of this default amplifying signal.
Be that amplitude and one first between this default amplifying signal faces limited signal or one second and faces between the amplitude of limited signal wherein through the amplitude of adjusted this correction amplifying signal of step (c), this first amplitude that faces limited signal is the amplitude greater than this default amplifying signal, and this second amplitude that faces limited signal is the amplitude less than this default amplifying signal.
Wherein in step (c), when this number of times that does not successfully read is respectively 1 and 2, be that the amplitude with this default amplifying signal downgrades or increase P unit respectively, P is the positive integer greater than 1.
Wherein in step (c), when this number of times that does not successfully read is respectively 3 and 4, be that the amplitude with this default amplifying signal downgrades Q unit respectively, Q is the positive integer greater than 1, and Q is greater than P.
Wherein in step (c), when this number of times that does not successfully read is 5, be that the amplitude with this default amplifying signal downgrades R unit, R is the positive integer greater than 1, and R is greater than Q.
Wherein when number of times that this does not successfully read, step (e) does not read success yet, makes then that this number of times that does not successfully read is 0, and downgrades this and read doubly speed, and repeating step (a).
Wherein this specific times is 5.
Wherein in step (e), then make this default amplifying signal for through adjusted this correction amplifying signal of step (c) if find to have read success.
Description of drawings
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and conjunction with figs. are described in detail below, wherein:
It is the calcspar of traditional optical read-write control system that Fig. 1 illustrates.
Fig. 2 illustrates the process flow diagram according to a kind of read method of a preferred embodiment of the present invention.
It is the Bode diagram of amplifying signal that Fig. 3 illustrates.
Embodiment
Please refer to Fig. 2, it illustrates the process flow diagram according to a kind of read method of a preferred embodiment of the present invention.This method is to read the address that a discs is got in times fast reading with one.Discs for example is the not good discs of burning quality such as CDR, CDRW, DVD+R/RW or DVD-R/RW.
When the optical R/W control system for example is when desiring to get a certain address of discs with 52 times of fast readings, then to begin to carry out this method.At first, making read error desired value EC is 0, shown in step 210.Then, read a doubly fast pairing amplifying signal according to this and read this address, shown in step 220.Wherein, this to read doubly fast pairing amplifying signal be to be a default amplifying signal.Default amplifying signal is to read doubly fast and set different predetermined values according to different before dispatching from the factory, and is recorded in the optical R/W control system.Then, check whether read success, shown in step 230.If read success, then method ends; If do not read success, then enter step 240.
When step 230 did not read successfully, then a shilling read error desired value EC added 1, shown in step 240.Read error desired value EC is the number of times that does not read success that equals this address.Then, if read error desired value EC is 1, will read then doubly that the amplitude of fast pairing amplifying signal downgrades 4 units, shown in step 242; If read error desired value EC is 2, will read then doubly that the amplitude of fast pairing amplifying signal increases 4 units, shown in step 244; If read error desired value EC is 3, will read then doubly that the amplitude of fast pairing amplifying signal downgrades 8 units, shown in step 246; If read error desired value EC is 4, will read then doubly that the amplitude of fast pairing amplifying signal increases 8 units, shown in step 248; If read error desired value EC is 5, will read then doubly that the amplitude of fast pairing amplifying signal downgrades 16 units, shown in step 250.
The above-mentioned doubly adjustment mode of the amplitude of fast pairing amplifying signal that reads be to make the amplitude of adjusted amplifying signal be greater than or less than the amplitude of default amplifying signal, and along with read error desired value EC is big more, the adjusting range of its amplitude is also big more.Yet the adjusting range that reads the amplitude of fast pairing amplifying signal doubly is not as limit.For example, when read error desired value EC is respectively 1,2,3,4 and 5, be to set to read doubly that the amplitude of fast pairing amplifying signal increases 3 respectively, downgrade 3, increase 6, downgrade 6 and increase 9 units.
Then, read this address again according to step 242,244,246,248 or 250 adjusted amplifying signals, shown in step 260.Then, check whether read success, shown in step 270.If read success, then first execution in step 280, method ends then.Wherein, be a correction amplifying signal through step 242,244,246,248 or 250 adjusted amplifying signals; Step 280 is that the default amplifying signal of order is through step 242,244,246,248 or 250 adjusted amplifying signals; If do not read success, then enter step 290.
When step 270 does not read successfully, judge then whether read error desired value EC is 5, shown in step 290.If read error desired value EC is not 5, then repeating step 240; If read error desired value EC is 5, then a shilling read error desired value EC is 0, and will read and doubly fastly reduce to 48 times of speed by 52 times of velocity modulations, shown in step 295, and then repeating step 220.
That is to say, when the optical R/W control system is desired to read times fast reading when getting a certain address of discs with a certain, be to read doubly fast pairing amplifying signal according to this earlier to read this address, if do not read success, then adjust this and read the doubly amplitude of fast pairing amplifying signal, and then read this address again according to adjusted amplifying signal according to read error desired value EC.Read the back again if find to have read success, then will preset amplifying signal and be modified to employed amplifying signal and method ends when reading again; If still can't correctly read the data of this address after reading 5 times again, then downgrade earlier and read doubly speed, and then read this address again till the data of this address correctly is read out.
Find through experiment, when within the specific limits the amplitude of amplifying signal being adjusted, the phase place of its amplifying signal be not subjected to shadow to.In order to be illustrated more clearly in this phenomenon, please refer to Fig. 3, it illustrates is the Bode diagram (Bode diagram) of amplifying signal.Fig. 3 can be divided into the first half and Lower Half, and wherein the first half is amplitude (magnitude) figure for Bode diagram, and Lower Half is phase place (phase) figure for Bode diagram.By the amplitude image of Bode diagram as can be known the amplitude of amplifying signal A be between amplifying signal B and C, and can clearly be seen that by the phase diagram of Bode diagram the pairing phase place of amplifying signal A, B and C is identical.
That is to say, if the amplifying signal A among Fig. 3 is 52 times of pairing default amplifying signals of speed, face limited signal and one second and face limited signal and amplifying signal B and C are respectively one first, then work as the optical R/W control system with the pairing amplifying signal of 52 multiples, that is amplifying signal A reads a certain address of discs and when not reading successfully, as long as the amplitude of 52 times of pairing amplifying signals of speed is adjusted between amplifying signal B and C, and then the adjusted amplifying signal of foundation reads again to this address, employed amplifying signal is and presets amplifying signal and have identical phase place when reading again thus.
In the read method of present embodiment, when the optical R/W control system reads that doubly fast pairing amplifying signal reads a certain address of discs and when not reading successfully according to a certain, then carry out the action of reading again, and exceed for 5 times to read again, do not read success yet if read the data of this address after 5 times again, then downgrade and read times speed and then read this address more again.Yet the number of times of reading again is might not exceed with 5 times in the preceding setting of dispatching from the factory.For example, also the number of times of reading again can be set at 6 times.
Compare with traditional read method, present embodiment is to reading doubly fast pairing amplifying signal the adjustment of scope to be arranged according to read error desired value EC.Therefore, the read method of present embodiment is more quickly the data on the discs to be read out.In addition, when optically read control system is read again and read successfully with adjusted amplifying signal same address, be that default amplifying signal is modified to employed amplifying signal when reading again.Thus, can so that ensuing read the action carry out more smoothly.
The disclosed read method of the above embodiment of the present invention can read out the data that is stored on the relatively poor discs of burning quality to promote the reading capability of CD player accurately and quickly.
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 operator; 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 as the criterion when looking accompanying the claim person of defining.
Claims (9)
1. the read method of a discs is to read speed doubly and decipher a radiofrequency signal and the address of reading a discs with one, it is characterized in that this method comprises:
(a). reading doubly according to this, speed pairing one default amplifying signal reads this address;
(b). check whether to read success, if, method ends then; If not, then enter step (c);
(c). the number of times adjustment of successfully not reading according to this address should default amplifying signal be a correction amplifying signal;
(d). read this address again according to adjusted this correction amplifying signal of step (c); And
(e). check whether to read success, if not, repeating step (c) then.
2. the read method of discs as claimed in claim 1 is characterized in that, wherein step (c) is to adjust the amplitude of this default amplifying signal.
3. the read method of discs as claimed in claim 1, it is characterized in that, be that amplitude and one first between this default amplifying signal faces limited signal or one second and faces between the amplitude of limited signal wherein through the amplitude of adjusted this correction amplifying signal of step (c), this first amplitude that faces limited signal is the amplitude greater than this default amplifying signal, and this second amplitude that faces limited signal is the amplitude less than this default amplifying signal.
4. the read method of discs as claimed in claim 1, it is characterized in that, wherein in step (c), when this number of times that does not successfully read is respectively 1 and 2, be that the amplitude that will preset amplifying signal downgrades or increase P unit respectively, P is the positive integer greater than 1.
5. the read method of discs as claimed in claim 4 is characterized in that, wherein in step (c), when this number of times that does not successfully read is respectively 3 and 4, be that the amplitude that will preset amplifying signal downgrades Q unit respectively, Q is the positive integer greater than 1, and Q is greater than P.
6. the read method of discs as claimed in claim 5 is characterized in that, wherein in step (c), when this number of times that does not successfully read is 5, is that the amplitude with this default amplifying signal downgrades R unit, and R is the positive integer greater than 1, and R is greater than Q.
7. the read method of discs as claimed in claim 1 is characterized in that, wherein when number of times that this does not successfully read, step (e) does not read success yet, makes then that this number of times that does not successfully read is 0, and downgrades this and read doubly speed, and repeating step (a).
8. the read method of discs as claimed in claim 7 is characterized in that, wherein this specific times is 5.
9. the read method of discs as claimed in claim 1 is characterized in that, wherein in step (e), then makes this default amplifying signal for through adjusted this correction amplifying signal of step (c) if find to have read success.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100037100A CN100437769C (en) | 2005-01-06 | 2005-01-06 | Optical disk reading method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100037100A CN100437769C (en) | 2005-01-06 | 2005-01-06 | Optical disk reading method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1801343A CN1801343A (en) | 2006-07-12 |
| CN100437769C true CN100437769C (en) | 2008-11-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100037100A Expired - Fee Related CN100437769C (en) | 2005-01-06 | 2005-01-06 | Optical disk reading method |
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| Country | Link |
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| CN (1) | CN100437769C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104636267B (en) * | 2013-11-11 | 2018-01-12 | 群联电子股份有限公司 | Memory control methods, memory storage apparatus and memorizer control circuit unit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4184108A (en) * | 1977-11-23 | 1980-01-15 | Sperry Rand Corporation | Self-regulating electronic tachometer |
| JPH08339615A (en) * | 1995-06-12 | 1996-12-24 | Canon Inc | Information recording/reproducing device |
| JP2001006190A (en) * | 1999-06-24 | 2001-01-12 | Matsushita Electric Ind Co Ltd | Optical disk apparatus |
| CN1506946A (en) * | 2002-10-24 | 2004-06-23 | ���µ�����ҵ��ʽ���� | Recording and reproducing apparatus |
-
2005
- 2005-01-06 CN CNB2005100037100A patent/CN100437769C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4184108A (en) * | 1977-11-23 | 1980-01-15 | Sperry Rand Corporation | Self-regulating electronic tachometer |
| JPH08339615A (en) * | 1995-06-12 | 1996-12-24 | Canon Inc | Information recording/reproducing device |
| JP2001006190A (en) * | 1999-06-24 | 2001-01-12 | Matsushita Electric Ind Co Ltd | Optical disk apparatus |
| CN1506946A (en) * | 2002-10-24 | 2004-06-23 | ���µ�����ҵ��ʽ���� | Recording and reproducing apparatus |
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| Publication number | Publication date |
|---|---|
| CN1801343A (en) | 2006-07-12 |
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Granted publication date: 20081126 Termination date: 20100208 |