CN1187738C - Method for regulating synchronous signals of CD reading device - Google Patents
Method for regulating synchronous signals of CD reading device Download PDFInfo
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- CN1187738C CN1187738C CNB021504520A CN02150452A CN1187738C CN 1187738 C CN1187738 C CN 1187738C CN B021504520 A CNB021504520 A CN B021504520A CN 02150452 A CN02150452 A CN 02150452A CN 1187738 C CN1187738 C CN 1187738C
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Abstract
The present invention relates to a method for regulating and generating the synchronous signals of a compact disc reading device, which is used for reading compact disc data by the compact disc reading device. The compact disc reading device generates a preset synchronous signal which is synchronous with the data synchronous signal of the compact disc data under a normal condition, wherein the preset synchronous signal comprises a plurality of preset synchronous pulses, and the data synchronous signal comprises a plurality of data synchronous pulses. When the data synchronous signal is not synchronous with the preset synchronous signal, successive data synchronous pulses positioned outside a preset window at the basic interval of the length of a picture are searched, and the preset synchronous pulses are regulated according to the data synchronous pulses to make the data synchronous pulses corresponding to the preset synchronous pulses so as to make the preset synchronous pulses synchronous with the data synchronous signal.
Description
Technical field
The invention relates to a kind of method of adjustment of synchronizing signal of disc accessing, and particularly relevant for the method for adjustment of the synchronizing signal of the disc accessing of the synchronizing pulse between a kind of search window.
Background technology
In recent years, the business opportunity of optical industry with and relevant technology can be described as constantly and to increase and progressive.With the CD writers is example, and speed in the past is 4 times of speed, and present replication rate has been promoted to 10 times, 12 times 16 times of speed even, that is to say, time of 1 CD of burning in the past in theory, and now can 4 CDs of burning.But, in fact,, also having the place that needs overcome technically if want to bring into play fully the function of high power speed burning CD, that is exactly the problem of impact damper underutilization (buffer under run).
The impact damper underutilization briefly, is exactly that data flow out the speed of the speed of impact damper greater than data inflow impact damper.When the burning CD, computing machine can be sent to data in the impact damper in the CD writers and store, and the laser head of CD writers then can be burnt to the data that are stored in the impact damper on the discs in regular turn.Because it is fixing that computing machine transmits the speed of data, thus the data of storing in the impact damper can the time few for a long time, still, no matter how many data in the impact damper have, the replication rate of laser head can not change.When computing machine transmits the speed of data when fast inadequately, data quantity stored just can constantly descend in the impact damper, and drops to when zero when the data volume in the impact damper, and CD writers just faces the writable predicament of no datat, and Here it is so-called impact damper underutilization.When above-mentioned situation took place, the action of laser head burning discs just can be interrupted suddenly, and causes burning failure, made to be formed bad sheet by the CD of burning.
Because under a lot of situations; for example computing machine is carried out the Another application program simultaneously; burning is carried out in typewriting while surfing the Net; or the bus speed of computing machine itself is slower or the like; the capital makes computing machine transmit data and slows down for the speed of CD writers, cause burning the situation of sheet failure so user regular meeting faces the impact damper underutilization.Generally prevention impact damper underutilization (BufferUnder Run Proof is proposed at this problem, BURN-Proof) technology, being summarized as follows of this technology, when data quantity stored in the impact damper drops to a limit, for example be 10 of maximum storage, CD writers is in the action that data burning will be stopped burning after the ending of a certain paragraph.And CD writers still can constantly receive the data that sent by computing machine and be stored in the impact damper at this moment.And when impact damper was filled with, CD writers just can start the function of burning once again, and the burning action that continues and before be stopped.From above-mentioned explanation as can be known, use BURN-Proof technology burning CD, how can not produce the situation of impact damper underutilization slowly no matter computing machine transmits the speed of data, thereby can lower the probability that bad sheet produces.
Used the discs of BURN-Proof function in the middle of by the process of burning, the data that write before it interrupts burning can produce a data break district (data gap) that there is no any data of record with the data of the burning that continues are middle, and the length in this data break district is minimum, for instance, if what use is the CD writers of 1 times of speed, then the chances are in the data break district of Chan Shenging 40 μ m.And this is because the formed data break of BURN-Proof district can cause the uncontinuity of discs data, and also therefore this data break district can impact discs data synchronization signal.
Please refer to Figure 1A, it shows a discs data synchronization signal schematic representation that does not have a data break district.Among Figure 1A, do not have the discs data synchronization signal 100 in data break district, formed by a succession of pulse (impulse) with regularity, each interpulse distance is certain.For instance, synchronizing pulse 101 and synchronizing pulse 103 for example are 588T at a distance of an image time frame (frame), and similarly, also can be between synchronizing pulse 103 and synchronizing pulse 105 at a distance of 588T.Please refer to Figure 1B, it shows a synoptic diagram with the discs data synchronization signal in data break district.Shown in Figure 1B, one synchronizing pulse 111 and the 113 middle data with the discs data synchronization signal 110 in data break district all are continuous, so the interval of these two synchronizing pulses 111 and 113 is just identical with the synchronizing pulse 101 and 103 of Figure 1A, all is 588T.And between the synchronizing pulse 113 and 115 among Figure 1B because the data break district arranged, and this data break district can make the former synchronizing pulse 115 that should appear at 588T position, synchronizing pulse 113 back therefore delay, so the distance between synchronizing pulse 113 and the synchronizing pulse 115 can be greater than 588T.And data break district not between synchronizing pulse 115 and 117, therefore, synchronizing pulse 115 and 117 interval revert to original 588T again.
Work as disc accessing,, when reading discs, can compare the discs data synchronization signal that synchronizing signal and CD player read of CD player itself with video-audio data as CD player etc.And if result relatively to be the synchronizing pulse of forming these two kinds of synchronizing signals can both distinguish corresponding words, the discs data just can be come out by decoding smoothly.Again, details are as follows for the corresponding situation of synchronizing pulse.
Please refer to Fig. 2, it shows the default synchronizing pulse of CD player and the corresponding synoptic diagram of data sync pulse of discs data.As shown in Figure 2, the pulse width of a default synchronizing pulse 202 and a data sync pulse 212 is t.Basically, when the time of default synchronizing pulse 202 and data sync pulse 212 appearance was identical, these two synchronizing pulses were corresponding synchronizing pulse.But, because the restriction of actual environment, these two synchronizing pulses produce small gap in time sometimes, therefore, consider the problem of slight error, it is w (form 204 of w＞t), the error permission when improving synchronizing pulse relatively that CD player can be provided with a length according to default synchronizing pulse 202.This kind practice is the time of comparing data synchronizing pulse 212 appearance and the time that form 204 occurs; When the time mileage of form 204 appearance also occurs according to synchronizing pulse 212, can think that default synchronizing pulse 202 is corresponding with data sync pulse 212.
But, when discs produces the interruption district because of BURN-Proof,, have no idea also to make that the pre-determined synchronization signal of CD player is corresponding with the data synchronizing signal of discs data even utilize form to improve the permission of error.Please refer to Fig. 3, it shows CD player and is reading an oscillogram of synchronizing signal with the discs in data break district.The data synchronizing signal 310 of discs comprise data sync pulse 301,303,305,307,309 and 311 and an image time frame of the data synchronizing signal 310 of discs data be 588T.Because the data interruption district of this section discs data is positioned between data sync pulse 305 and the data sync pulse 307, so data sync pulse 305 can be bigger than the interval (588T) of other data sync pulse with the interval of data sync pulse 307, for example is 825T.And the pre-determined synchronization signal 350 of CD player comprises default synchronizing pulse 351,353,355,357,359 and 361, and whether CD player can compare these default synchronizing pulses one by one corresponding with the data sync pulse 310,303,305,307,309 and 311 of discs.
As shown in Figure 3, the result who has only first three default synchronizing pulse and data sync pulse to be compared is corresponding, all can present not corresponding situation from the 4th result that synchronizing pulse is later.This is owing to data sync pulse 307 because the cause in data break district is extended down to data sync pulse 305 back 825T parts, but CD player also can't be predicted this thing, so the default synchronizing pulse 357 of CD player still can appear at default synchronizing pulse 355 back 588T parts, has caused the not corresponding situation of primary synchronizing pulse.And return to the interval of 588T in the data sync pulse of data sync pulse 307 back discs, but, CD player only detects the data sync pulse of the discs in the corresponding scope of its synchronizing pulse form, in other words, CD player can't be learnt after data sync pulse 307 and (comprise data sync pulse 307), data sync pulse time of occurrence is all delayed 237T (825T-588T), also therefore CD player still can be set its default synchronizing pulse in original mode, so the default synchronizing pulse 357 of CD player and its default synchronizing pulse afterwards, it for example is default synchronizing pulse 359, default synchronizing pulses 361 etc. all can't be corresponding with the data sync pulse 309 and the data sync pulse 311 of discs.
With existing CD player function, only otherwise corresponding synchronizing pulse number is no more than a limit, for example say 30, even synchronizing pulse can't the corresponding function that still can utilize some corrections and correct mistakes come out the decoding of data integrity.But, by above-mentioned explanation as can be known, the discs of using Burn-Proof when reading institute not the number of corresponding synchronizing pulse might surpass the numeral of this upper limit, therefore can cause the difficulty of CD player on decoding.
Summary of the invention
In view of this, purpose of the present invention is exactly the synchronizing signal that is to provide a kind of adjustable lay the grain disk fetch device, makes its method corresponding to discs data synchronization signal.
According to purpose of the present invention, a kind of method of adjustment of synchronizing signal of disc accessing is proposed, the method is used when disc accessing reads discs data, wherein, disc accessing produces a pre-determined synchronization signal and this pre-determined synchronization signal is under normal circumstances synchronous with the data synchronizing signal of discs data, and pre-determined synchronization signal comprises a plurality of default synchronizing pulses, and data synchronizing signal comprises a plurality of data sync pulses, and the method comprises: step a. sets the N value.And step b. is provided with N default form according to the individual default synchronizing pulse of the N of pre-determined synchronization signal.Then carrying out step c judges whether in the external detection to two of N default form continuously and the data sync pulse of the preset distance of being separated by.And steps d is: if result of step c, then allows the pre-determined synchronization signal new detected data synchronizing signal in step c synchronously of disc accessing for being.And step e is: if result of step c then judges whether to detect a data synchronizing signal in N default form, if then be back to step a for not.Step f then is: if in the result of step e for not, judge whether that then the N value is greater than a preset value.Step g is: if the result of step e is for being then to finish the method.And step h is: if the result of step g then upgrades the N value, and is back to step a for not.
According to another object of the present invention, a kind of method of adjustment of synchronizing signal of disc accessing is proposed, this method is used when disc accessing reads discs data, wherein, this disc accessing produces a pre-determined synchronization signal and this pre-determined synchronization signal is under normal circumstances synchronous with the data synchronizing signal of these discs data, and this pre-determined synchronization signal comprises a plurality of default synchronizing pulses, this data synchronizing signal comprises a plurality of data sync pulses, and this method comprises: a. sets a parameter value N; B. according to N default synchronizing pulse of this pre-determined synchronization signal, N default form is set; C. judge whether a synchronizing pulse hiting signal is enabled state, in this way, then is back to step a, otherwise, carry out steps d; D. judge in this N the default form whether corresponding data sync pulse is arranged, if, then be back to step a, if not, then carry out step e; And whether e. judge the N value greater than a predetermined value, if, then finish this method, if not, then upgrade the N value, and be back to step b.
According to another object of the present invention, a kind of method of adjustment of synchronizing signal of disc accessing is proposed, the method is to use when disc accessing reads the discs data, wherein, described disc accessing produces a pre-determined synchronization signal and this pre-determined synchronization signal is under normal circumstances synchronous with the data synchronizing signal of discs data, and pre-determined synchronization signal comprises a plurality of default synchronizing pulses, data synchronizing signal comprises a plurality of data sync pulses, the method comprises: set the N value in step a, then according to N default synchronizing pulse N default form is set in step b.Come execution in step c again: whether have in the judgment data synchronizing signal and N corresponding first data sync pulse of default form, if then enter step 1, otherwise enter steps d.And whether steps d judges the N value greater than predetermined value, if, then finishing this method, otherwise enter step e, distance one image time frame locates to be provided with N+1 default synchronizing pulse behind N default synchronizing pulse.Then enter step f, according to N+1 default synchronizing pulse execution in step g behind N+1 the default form is set, judge whether first data sync pulse in the discs data corresponds between N default form and the individual default form of N+1, if not, then enter step k, if then enter step h.In step h, whether have in the judgment data synchronizing signal and second the data synchronizing pulse of the 1st data synchronizing pulse at a distance of an image time frame, if not, then enter step k, if then carry out step I, estimate the time that the 3rd data synchronizing pulse occurs according to second data synchronizing pulse, then execution in step j adjusts N+2 default synchronizing pulse and makes N+2 default synchronizing pulse correspond to the 3rd data synchronizing pulse, and finishes this method.In step k, the N value added 1 and get back to step c.In step 1 according to N default synchronizing pulse be provided with N+1 default synchronizing pulse and with N+1 the corresponding N+1 of default synchronizing pulse default form, and finish this method.
According to the present invention, a kind of synchronizing signal production method of disc accessing is proposed, this method is used when disc accessing reads discs data, wherein, this disc accessing produces a pre-determined synchronization signal and this pre-determined synchronization signal is under normal circumstances synchronous with the data synchronizing signal of these discs data, and this pre-determined synchronization signal comprises a plurality of default synchronizing pulses, this data synchronizing signal comprises a plurality of data sync pulses, this method comprises: a. is provided with next default synchronizing pulse and corresponding next default form according at present default synchronizing pulse when this pre-determined synchronization signal and this data synchronizing signal are synchronous; B. when this pre-determined synchronization signal is asynchronous with this data synchronizing signal, according to a default synchronizing pulse one default form is set, and judges whether to detect first data sync pulse and be positioned at outside this default form; And c. makes the default synchronizing pulse of this disc accessing correspond to this second data synchronizing pulse when detecting with this first data sync pulsion phase apart from second data synchronizing pulse of an image time frame.
The method of adjustment of the synchronizing signal of optical disc apparatus of the present invention, the synchronizing signal of adjustable lay the grain disk fetch device makes its data synchronizing signal with the discs data corresponding, and then make disc accessing can successfully read the discs that other has the interruption district, and can also improve the sheet rate of reading of discs with flaw.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and cooperate appended graphicly, be described in detail below:
Description of drawings
Figure 1A shows one and does not have the discs data synchronization signal schematic representation that is interrupted the district;
Figure 1B shows one and has the discs data synchronization signal schematic representation that is interrupted the district;
Fig. 2 shows the default synchronizing pulse of CD player and the corresponding synoptic diagram of data sync pulse of discs data;
Fig. 3 shows CD player and is reading an oscillogram with synchronizing signal of the discs of being interrupted the district;
Fig. 4 A shows the process flow diagram according to the method for adjustment of the synchronizing signal of the disc accessing of first preferred embodiment of the present invention;
Fig. 4 B shows the process flow diagram according to the method for adjustment of the synchronizing signal of the disc accessing of first preferred embodiment of the present invention;
Fig. 5 shows and utilizes the present invention to solve the not synoptic diagram of corresponding problem of Fig. 3 synchronizing pulse;
Fig. 6 shows the process flow diagram according to the method for adjustment of the synchronizing signal of the disc accessing of second preferred embodiment of the present invention.
[reference numerals explanation]
101,103,105,107,111,113,115,117,202,212: synchronizing pulse
100,110: synchronizing signal
204: form
310: data synchronizing signal
301,303,305,307,309,311: the data sync pulse
350,550: pre-determined synchronization signal
351,353,355,357,359,361,557,559,561: default synchronizing pulse
577: the 1 default forms
579: the 2 default forms
Embodiment
Whether the present invention utilizes search to have to be positioned at default form outer and basically at a distance of the continuous data sync pulse of a shot length, and adjusts default synchronizing pulse according to this data sync pulse, makes the data sync pulse corresponding with default synchronizing pulse.In order further to explain the present invention, below enumerate two preferably
Embodiment.
Please refer to Fig. 4 A and 4B, it shows the process flow diagram according to the method for adjustment of the synchronizing signal of the disc accessing of first preferred embodiment of the present invention.At first, please refer to Fig. 4 A.One of definition earlier is more than or equal to 1 positive integer N, the number of times that the corresponding comparison of synchronizing pulse is carried out in the N representative in step 401.When entering the method at the beginning, can earlier the N value be made as 1.And after CD player began to carry out the method, the 1st synchronizing pulse that CD player produced just became the 1st default synchronizing pulse.In step 403, CD player can be provided with a corresponding N default form according to N default synchronizing pulse, and for example when N=1, CD player will be provided with the 1st default form.The size of default form is decided in its sole discretion by the user.Then, in step 405, can determine whether synchronizing pulse hiting signal sync_hit is 1.Synchronizing pulse hiting signal sync_hit was set as 1 o'clock, representative is (that is behind the data synchronizing signal outside detecting default form) after the data sync pulse begins irregular the appearance, the data sync pulse that rule occurs be can detect once more, that is continuous at least two data synchronizing pulses and the apart in essence image time frame of this two data synchronizing pulses detected.Opposite, when synchronizing pulse hiting signal sync_hit was set as 0, the data synchronizing signal of representing the pre-determined synchronization signal of CD player and discs data was not to going up.After how determining that as for the present invention synchronizing pulse hiting signal sync_hit then will be specified in.If synchronizing pulse hiting signal sync_hit is 1, then flow process skips back to step 401.If synchronizing pulse hiting signal sync_hit is not 1 (just synchronizing pulse hiting signal sync_hit is 0), then the flow process subsequent steps 407.
And follow, CD player can be held a state machine (state machine), the data synchronizing signal of the discs data that this N default form is brought and is read is made comparisons, and comes across in this N the default form to have judged whether corresponding data sync pulse.Its practice be synchronizing pulse with first appearance in the data synchronizing signal as first data sync pulse, and seeking on the data synchronizing signal whether synchronizing pulse is being arranged in the time that N form occurs.As described in step 407, whether CD player can have and N corresponding first data sync pulse of default form on the judgment data synchronizing signal.
In step 407, if having on the discs data and N corresponding first data sync pulse of default form, just expression can be set next default synchronizing pulse and form thereof according to the at present default synchronizing pulse of CD player.That is be to skip back to step 401.Behind original N default synchronizing pulse,, for example be that the place of 588T is provided with next N default synchronizing pulse, and new N default synchronous form be set according to newly-installed N default synchronizing pulse at a distance of an image time frame.
If do not have on the discs data and N corresponding first data sync pulse of default form, the pre-determined synchronization signal of expression CD player and the data synchronizing signal of discs data be not to going up.Proceed step 411 this moment.Because when CD player does not have corresponding data sync pulse in the present default form of discovery, CD player can repeat the action of comparison up to finding and the corresponding data sync pulse of default form, therefore, need to set the upper limit of a repetitive operation number of times, just a predetermined value.If the meaning of this predetermined value is, avoids CD player to repeat above-mentioned method for searching always, and cause the low of reading efficiency even failure.Therefore, in step 411, whether CD player will judge the N value greater than predetermined value, if then finish the method, and utilization detected data sync pulse after a period of time comes as new synchronizing pulse.But this is representing that the centre will have one piece of data to lose, and then causes the difficulty even the failure of discs data read.And if the N value as yet not greater than predetermined value, then enters step 413.
In step 413, carry out N=N+1.Then, flow process skips back to step 403.This is representing, CD player can be after distance N default synchronizing pulse 588T place, set next (just N+1) default synchronizing pulse, and the individual default form of N+1 be set according to the individual default synchronizing pulse of N+1.Because when the data sync pulse is delayed because being interrupted the district, this data sync pulse will appear at outside the default form, also therefore, CD player can be opened a state machine (state machine) more in addition, checks the data sync pulse that whether occurs outside default form.
Below will describe the present invention and how obtain synchronizing pulse hiting signal sync_hit.Please refer to Fig. 4 B.The flow process that is noted that Fig. 4 A and Fig. 4 B is carried out simultaneously.But as long as synchronizing pulse hiting signal sync_hit is 1 o'clock, then as long as can skip back to step 401 when Fig. 4 A step of being carried out again proceeds to step 405 by the time.
So, in step 415, CD player can be judged the data sync pulse whether the discs data are arranged at the outside of N default form (just two default form between), if not, then repeat this step 415, up to till detecting the data sync pulse between two default forms; Or up to N greater than preset value (this moment, whole flow process all can finish, no matter be the flow process of 4A or 4B figure).If between two default forms, detect the data sync pulse, then enter step 417.
When the data sync pulse between the default form of CD player discovery, distinguish the data sync pulse of being delayed in order to determine that this data pulse is because of being interrupted, whether the next data sync pulse that therefore needs to judge this data sync pulse appears at a distance of image time frame distance afterwards.If, can affirm that then this data pulse is because of being interrupted the data sync pulse that the district is delayed, if not, then need to carry out again the search of data, that is flow process skips back to step 415 because of the data sync pulse that is interrupted the district and delayed.Therefore in step 417, CD player can judge after first data sync pulse in the discs data at a distance of image time frame (frame) part whether second data synchronizing pulse is arranged, and if not, then gets back to step 415; If then enter step 419.
When determining first and second data synchronizing pulse behind an image time frame, CD player can be adjusted the default synchronizing pulse of CD player according to these two data synchronizing pulses, makes the corresponding above-mentioned data sync pulse of default synchronizing pulse energy.So in step 419, synchronizing pulse hiting signal sync_hit is made as 1 (representative system has detected a new data sync pulse with regularity, therefore can will preset data sync pulse on the synchronizing pulse correspondence); And will preset synchronizing pulse is adjusted into and data sync impulsive synchronization (or say the new default synchronizing pulse of system is treated as in the regular data sync pulse of second appearance).
Please refer to Fig. 5, it shows and utilizes the present invention to solve the not synoptic diagram of corresponding problem of Fig. 3 synchronizing pulse.Fig. 5 has a data synchronizing signal 310 and a pre-determined synchronization signal 550.Please be simultaneously with reference to the process flow diagram of the 4th figure.At first, N=1, the 1st default synchronizing pulse is provided with the 1st default form 577 for default synchronizing pulse 557 and according to default synchronizing pulse 557.Then a state machine of CD player has judged whether and the 1st default form 577 corresponding first data sync pulses, and the result who judges does not have, and this is because data sync pulse 307 is delayed a period of time because of the cause of discontinuity area.Then because 1 less than pre-determined number, so CD player according to the 2nd default synchronizing pulse, just default synchronizing pulse 559 is provided with the 2nd default form 579.Then, CD player is provided with a state machine in addition and finds first data sync pulse, and data sync pulse just 307 is between 579 of the 1st default form 577 and the 2nd default forms.And find second data synchronizing pulse, data sync pulse just 309 are arranged in data sync pulse 307 back distance one image time frame (588T) parts.CD player dopes the position of next data sync pulse 311 according to data sync pulse 309, and adjusts the 3rd default synchronizing pulse of CD player, and just default synchronizing pulse 561 makes it corresponding with data sync pulse 311.
This invention is not limited to read the discs of using the burning of BURN-Proof institute to become, also can be used for reading other and has the discs of being interrupted the district, in addition, can also improve the sheet rate of reading of the discs with flaw.This is because CD player also the situation that pre-determined synchronization signal does not correspond to data synchronizing signal can take place when reading the discs with flaw sometimes.And the method for this invention is in order to adjust the pre-determined synchronization signal of CD player, to make its data synchronizing signal locking phase with discs corresponding, therefore can increase the sheet rate of reading of CD player.
Please refer to Fig. 6, it shows the process flow diagram according to the method for adjustment of the synchronizing signal of the disc accessing of second preferred embodiment of the present invention.At first, one of definition earlier is more than or equal to 1 positive integer N, the number of times that the corresponding comparison of synchronizing pulse is carried out in the N representative in step 601.When entering the method at the beginning, can earlier the N value be made as 1.And after CD player began to carry out the method, the 1st synchronizing pulse that CD player produced just became the 1st default synchronizing pulse.In step 603, CD player can be provided with a corresponding N default form according to N default synchronizing pulse, and for example when N=1, CD player will be provided with the 1st default form.And follow, CD player can be held a state machine, and the data synchronizing signal of the discs data that this N default form is brought and is read is made comparisons, to have judged whether corresponding data sync pulse.Its practice be synchronizing pulse with first appearance in the data synchronizing signal as first data sync pulse, and seeking on the data synchronizing signal whether synchronizing pulse is being arranged in the time that N form occurs.As described in step 605, whether CD player can have and N corresponding first data sync pulse of default form on the judgment data synchronizing signal.
If on the discs data, have and individual corresponding first data sync pulse of default form of N, can set the next one according to N default synchronizing pulse of CD player with regard to expression, just individual default synchronizing pulse of N+1 and form thereof.That is be execution in step 619 and 621, behind N default synchronizing pulse,, for example be that the place of 588T is provided with N+1 default synchronizing pulse, and N+1 default synchronous form be set according to N+1 default synchronizing pulse at a distance of an image time frame.Afterwards, finish the method.
If do not have on the discs data and N corresponding first data sync pulse of default form, the pre-determined synchronization signal of expression CD player and the data synchronizing signal of discs data be not to going up, therefore CD player will begin execution in step 607, in order to adjust the pre-determined synchronization signal of CD player, default synchronizing pulse is able to and data sync pulsion phase correspondence.Because when CD player does not have corresponding data sync pulse in the present default form of discovery, CD player can repeat the action of comparison up to finding and the corresponding data sync pulse of default form, therefore, need to set the upper limit of a repetitive operation number of times, just a predetermined value.Therefore, in step 607, whether CD player will judge the N value greater than predetermined value, if, then finish the method, if not, then enter step 609.
In step 609, CD player can be after distance N default synchronizing pulse 588T place, set N+1 default synchronizing pulse, and the individual default form of N+1 be set according to the individual default synchronizing pulse of N+1.Because when the data sync pulse was delayed because being interrupted the district, this data sync pulse will appear at outside the default form, also therefore, CD player can be opened a state machine more in addition, checks the data sync pulse that whether occurs outside presetting form.So, in step 611, CD player can judge whether that following period of time in the middle of N default form and the individual default form of N+1 has first data sync pulse of discs data, if not, then enter step 623, N is added 1 and get back to step 605, to repeat to seek the action of data sync pulse; If then enter step 613.
When the data sync pulse between the default form of CD player discovery, distinguish the data sync pulse of being delayed in order to determine that this data pulse is because of being interrupted, whether the next data sync pulse that therefore needs to judge this data sync pulse appears at a distance of image time frame distance afterwards.If can affirm that then this data pulse is because of being interrupted the data sync pulse that the district is delayed, and if not, then needs to carry out again data because of being interrupted the search of distinguishing the data sync pulse of being delayed.Therefore CD player can judge in the discs data and locate at a distance of an image time frame (frame) whether second data synchronizing pulse is arranged after first data sync pulse in step 613, if not, then enters step 623; If then enter step 615.
When determining first and second data synchronizing pulse behind an image time frame, CD player can be adjusted the default synchronizing pulse of CD player according to these two data synchronizing pulses, makes default synchronizing pulse can correspondingly go up the data sync pulse.Because the distance between the data sync pulse is an image time frame under normal conditions, therefore in step 615, CD player can be predicted the time that the 3rd data synchronizing pulse occurs according to second data synchronizing pulse.And in 617, the default synchronizing pulse that CD player can adjustment itself makes that N+2 default synchronizing pulse is corresponding with the 3rd data synchronizing pulse.At last, finish the method.
In sum, first preferred embodiment and second preferred embodiment all utilize identical principle to make default synchronizing pulse can correspondingly go up the data sync pulse.And second preferred embodiment also is not limited to read the discs of using the burning of BURN-Proof institute to become, also can be used for reading other and have the discs of being interrupted the district, in addition the discs that for example is to use the burning of connection (JustLink) institute to become, can also improve the sheet rate of reading of the discs with defective.
The method of adjustment of the synchronizing signal of the optical disc apparatus that the above embodiment of the present invention disclosed, the synchronizing signal of adjustable lay the grain disk fetch device makes its data synchronizing signal with the discs data corresponding, and then make disc accessing can successfully read the discs that other has the interruption district, and can also improve the sheet rate of reading of discs with flaw.
In sum; though the present invention discloses as above with a preferred embodiment; right its is not in order to limit the present invention; any those skilled in the art; under the situation that does not break away from the spirit and scope of the present invention; when can doing various changes and variation, so protection scope of the present invention is as the criterion when looking the accompanying Claim book.
Claims (9)
1. the method for adjustment of the synchronizing signal of a disc accessing, this method is used when disc accessing reads discs data, wherein, this disc accessing produces a pre-determined synchronization signal and this pre-determined synchronization signal is under normal circumstances synchronous with the data synchronizing signal of these discs data, and this pre-determined synchronization signal comprises a plurality of default synchronizing pulses, this data synchronizing signal comprises a plurality of data sync pulses, and this method comprises:
A. set a N value;
B. N default synchronizing pulse according to this pre-determined synchronization signal is provided with N default form;
C. judge whether continuously and the data sync pulse of the preset distance of being separated by in the external detection to two of this N default form;
If d. in result of step c for being, the pre-determined synchronization signal that then makes this disc accessing is new detected data synchronizing signal in step c synchronously;
If be not e., then judge whether in this N default form, to detect a data synchronizing signal, if then be back to step a in result of step c;
If f. the result at step e is not, judge whether that then the N value is greater than a preset value;
If g. in the result of step f for being then to finish the method; And
If h. the result at step f is not, then upgrades the N value, and be back to step a.
2. the method for claim 1, wherein in step c, this preset distance is an image time frame.
3. the method for claim 1, wherein in step h, the action of upgrading the N value comprises the N value is added 1.
4. the method for adjustment of the synchronizing signal of a disc accessing, this method is used when disc accessing reads discs data, wherein, this disc accessing produces a pre-determined synchronization signal and this pre-determined synchronization signal is under normal circumstances synchronous with the data synchronizing signal of these discs data, and this pre-determined synchronization signal comprises a plurality of default synchronizing pulses, this data synchronizing signal comprises a plurality of data sync pulses, and this method comprises:
A. set a parameter value N;
B. according to N default synchronizing pulse of this pre-determined synchronization signal, N default form is set;
C. judge whether a synchronizing pulse hiting signal is enabled state, in this way, then is back to step a, otherwise, carry out steps d;
D. judge in this N the default form whether corresponding data sync pulse is arranged, if, then be back to step a, if not, then carry out step e; And
E. whether judge the N value greater than a predetermined value, if, then finish this method, if not, then upgrade the N value, and be back to step b.
5. method as claimed in claim 4 also comprises the following step:
I. judge whether N data synchronizing pulse in this data synchronizing signal is positioned at the outside of this N default form, if, then enter step I i, if not, repeating step i then;
Ii. judge whether to detect and N+1 the data synchronizing pulse of this N data synchronizing pulse at a distance of an image time frame, if, then enter step I ii, if not, then be back to step I;
Iii. this N+1 data synchronizing pulse is made as N+1 the default synchronizing pulse of this pre-determined synchronization signal, and to make this synchronizing pulse hiting signal be enabled state; And
Wherein above-mentioned step I is carried out simultaneously to the execution of step I ii and above-mentioned step a to the execution of step e.
6. the synchronizing signal production method of a disc accessing, this method is used when disc accessing reads discs data, wherein, this disc accessing produces a pre-determined synchronization signal and this pre-determined synchronization signal is under normal circumstances synchronous with the data synchronizing signal of these discs data, and this pre-determined synchronization signal comprises a plurality of default synchronizing pulses, this data synchronizing signal comprises a plurality of data sync pulses, and this method comprises:
A. when this pre-determined synchronization signal and this data synchronizing signal are synchronous, next default synchronizing pulse and corresponding next default form are set according at present default synchronizing pulse;
B. when this pre-determined synchronization signal is asynchronous with this data synchronizing signal, according to a default synchronizing pulse one default form is set, and judges whether to detect first data sync pulse and be positioned at outside this default form; And
C. when detecting with this first data sync pulsion phase, make the default synchronizing pulse of this disc accessing correspond to this second data synchronizing pulse apart from second data synchronizing pulse of an image time frame.
7. synchronizing signal production method as claimed in claim 6, wherein in this step b, when having with should default form corresponding this first data sync pulse in this data synchronizing signal, this pre-determined synchronization signal and this data synchronizing signal are synchronous.
8. the method for adjustment of the synchronizing signal of a disc accessing, this method is used when disc accessing reads discs data, wherein, this disc accessing produces a pre-determined synchronization signal and this pre-determined synchronization signal is under normal circumstances synchronous with the data synchronizing signal of these discs data, and this pre-determined synchronization signal comprises a plurality of default synchronizing pulses, this data synchronizing signal comprises a plurality of data sync pulses, and this method comprises:
A. set the N value;
B. N default synchronizing pulse according to this pre-determined synchronization signal is provided with N default form;
Whether this data synchronizing signal in have and this N default form corresponding first data sync pulse, if then enter step l if c. judging;
D. whether judge the N value greater than a predetermined value, if then finish this method;
E. distance one image time frame part is provided with N+1 default synchronizing pulse behind this N default synchronizing pulse;
F. according to N+1 default synchronizing pulse N+1 default form is set;
G. judge that this first data sync pulse in this data synchronizing signal whether between this N default form and N+1 default form, if not, then enters step k;
Whether h. judge has in this data synchronizing signal and second the data synchronizing pulse of this first data sync pulsion phase apart from an image time frame, if not, then enter step k;
I. estimate the time that the 3rd data synchronizing pulse occurs according to this second data synchronizing pulse;
J. make this N+2 default synchronizing pulse correspond to the 3rd data synchronizing pulse, and finish this method;
K. upgrade the N value and get back to step c; And
L. according to this N default synchronizing pulse, be provided with N+1 default synchronizing pulse and with this N+1 the corresponding N+1 of default synchronizing pulse default form.
9. method as claimed in claim 8, wherein in step k, the action of upgrading the N value comprises the N value is added 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021504520A CN1187738C (en) | 2002-11-12 | 2002-11-12 | Method for regulating synchronous signals of CD reading device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021504520A CN1187738C (en) | 2002-11-12 | 2002-11-12 | Method for regulating synchronous signals of CD reading device |
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| CN1405759A CN1405759A (en) | 2003-03-26 |
| CN1187738C true CN1187738C (en) | 2005-02-02 |
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| CNB021504520A Expired - Fee Related CN1187738C (en) | 2002-11-12 | 2002-11-12 | Method for regulating synchronous signals of CD reading device |
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| JP2005276346A (en) | 2004-03-25 | 2005-10-06 | Nec Electronics Corp | Synchronizing signal detector, information recording and reproducing device, and synchronizing signal detecting method |
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