CN100470659C - Opticaldisk data detecting system and method - Google Patents
Opticaldisk data detecting system and method Download PDFInfo
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- CN100470659C CN100470659C CNB2006100846044A CN200610084604A CN100470659C CN 100470659 C CN100470659 C CN 100470659C CN B2006100846044 A CNB2006100846044 A CN B2006100846044A CN 200610084604 A CN200610084604 A CN 200610084604A CN 100470659 C CN100470659 C CN 100470659C
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Abstract
This invention relates to a CD data detection system suitable for detecting CD data of DVD-RAM format including a pre-synchronized data and data regions, in which, the data region includes multiple signal frames each of them includes a synchronous data and data block. The detection system includes: a pre-synchronous signal generator, a false synchronous signal generator and a synchronous signal generator, when the pre-synchronous signal generator detects pre-synchronous data, it generates a pre-synchronous pulse signal, when the false synchronous signal generator receives the pre-synchronous pulse signal, it generates a false synchronous pulse signal within the first specific time length. After the synchronous signal generator has received pre-synchronous pulse signal, it generates a synchronous pulse signal of information frame while detecting a synchronous data of a signal frame in multiple signal frames.
Description
Technical field
This invention relates to a kind of data detection system of DVD-RAM disk format, and particularly a kind of presynchronization data according to the DVD-RAM disk format are sent the synchronization pulse of a vacation, helps CD-ROM drive decoding.
Background technology
Digital versatile disc (digital versatile disc DVD) has specifications such as high power capacity, high image quality, stores no matter be applied in the backup of mass file, or the record of video-audio data and broadcast, be currently marketed preferred plan.The specification of digital versatile disc form has comprised DVD-ROM (digitalversatile disk read only memory) and DVD-RAM (d
Igital versatile disk Random access memory) etc.
Fig. 1 is the track bar form of DVD-RAM, be divided into several sections (Sector) on this track bar, each section all is made up of header area (Header) and recording areas institutes such as (Recording Area), wherein, the header area is that imprinting is on CD when making CD, and recording areas then is the zone of recorded data.Comprise an oscillation inverter (variable frequency oscillator in the recording areas; VF03) data; one presynchronization (Pre sync; PS) data; one data area (Data Field) or the like field; wherein; the data area is used for putting down in writing the data that the user writes; other part then gives over to protection; recognition data zone etc.; and the data area can be divided into 26 signal frames (frame); each signal frame is made up of a synchrodata (syncpattern) and a data block again; wherein; data block is used for depositing the data that the user writes, and synchrodata is then in order to the protected data piece.
Please refer to the structural drawing of Fig. 2 for existing CD-ROM drive 20, is the decoding principle that example illustrates the DVD-RAM form with Fig. 2.Existing CD-ROM drive 20 comprises an optical read head 202, an Opticaldisk data detecting system 204 and a code translator 206.Optical read head 202 read in the CD 200 of DVD-RAM form come source data after, then Opticaldisk data detecting system 204 is according to the synchrodata of 26 signal frames in Data Detection one data area, source.When Opticaldisk data detecting system 204 detects the synchrodata of a signal frame in the data area, then produce the synchronization pulse of a signal frame, indicate the position of the data block of this signal frame, when therefore detecting a data zone, can produce 26 synchronization pulses, and export these synchronization pulses to code translator 206.Last code translator 206 is according to these 26 synchronization pulses and come source data, deciphers out this data area.
And during the synchrodata of 26 signal frames of prior art in detecting the data area, must detect from the header area backward, because range data zone in header area is slightly far away, if error is arranged in the testing process, and can't detect the synchrodata of first signal frame in the data area time, to cause to send the synchronization pulse of first signal frame, indicate the position of the data block of first signal frame, and make code translator 206 can't decipher out this data area.
Summary of the invention
In view of this, the invention provides the Opticaldisk data detecting system and the method for a kind of DVD-RAM of detection data area, in the time can't detecting the synchrodata of first signal frame in the data area, then send a false synchronization pulse, the synchronization pulse of first signal frame that replacement should be exported, come the data block location of first signal frame in the unlabeled data zone, make code translator still decodable code go out this data area.
The present invention discloses a kind of Opticaldisk data detecting system, is applicable to the data of optical disk that detects the DVD-RAM form.Wherein the data of optical disk of DVD-RAM form comprises presynchronization data and data area, and the data area comprises a plurality of signal frames, and each signal frame comprises a synchrodata and a data block again.This Opticaldisk data detecting system comprises a presynchronization signal generator, a synchronous detection window generator, a false sync generator, a synchronous signal generator, a signal frame counter and in order to produce a data area detecting device of a data area signal.When the presynchronization signal generator detects the presynchronization data, then produce a presynchronization pulse signal.Receive above-mentioned presynchronization pulse signal and work as synchronous detection window generator, then generation time length is the synchronous detection window that the above-mentioned first special time length adds one second special time length.Receive the presynchronization pulse signal and work as false sync generator, then after one first special time length, produce a false synchronization pulse.And after sync generator receives the presynchronization pulse signal, then every when the synchrodata of a signal frame that detects a plurality of signal frames, the synchronization pulse of a signal frame of generation.And after the synchronization pulse of the 1st signal frame in above-mentioned a plurality of signal frames or above-mentioned false synchronization pulse send, then above-mentioned signal frame counter begins counting by 1, and after the synchronization pulse of signal frame after the 1st signal frame in above-mentioned a plurality of signal frames sent, the counting of then above-mentioned signal frame counter is each to increase by 1.And when the data area detecting device receives above-mentioned presynchronization pulse signal, then above-mentioned data area signal is promoted to high logic level by low logic level, and be 26 o'clock at the counting of above-mentioned signal frame counter, then above-mentioned data area signal is reduced to low logic level by high logic level.
The present invention discloses a kind of signal generating method, according to the data of optical disk of DVD-RAM form to produce signal.Wherein the data of optical disk of DVD-RAM form comprises presynchronization data and data area, and the data area comprises a plurality of signal frames, and each signal frame comprises a synchrodata and a data block again.This signal generating method comprises: when detecting the presynchronization data, then produce a presynchronization pulse signal; After the presynchronization pulse signal produced, producing a time length was the synchronous detection window that one first special time length adds one second special time length; After the first special time length that the presynchronization pulse signal produces, produce a false synchronization pulse; During the synchrodata of every signal frame in detecting a plurality of signal frames, then produce a synchronization pulse; Behind the synchronization pulse or above-mentioned false synchronization pulse generation of the 1st signal frame in above-mentioned a plurality of signal frames, then begin counting by 1, and after the synchronization pulse of signal frame after the 1st signal frame in above-mentioned a plurality of signal frames sent, then counting is each increased by 1; Produce a data area signal; When above-mentioned presynchronization pulse signal generation, then above-mentioned data area signal is promoted to high logic level by low logic level; And be 26 o'clock at above-mentioned counting, then above-mentioned data area signal is reduced to low logic level by high logical bit.
Description of drawings
Of the present invention state purpose for making, feature and advantage can become apparent, embodiment cited below particularly, and conjunction with figs., it is as follows to be elaborated:
Fig. 1 shows the track bar form of DVD-RAM.
Fig. 2 shows the structural drawing of existing CD-ROM drive 20.
Fig. 3 shows the structural drawing according to embodiment of the invention CD-ROM drive 30.
Fig. 4 shows the structural drawing according to embodiment of the invention Opticaldisk data detecting system 304;
Fig. 5 shows the sequential chart of the signal that is produced according to Opticaldisk data detecting system 304 of the present invention;
Fig. 6 a, 6b, 6c show the process flow diagram according to the data of optical disk detection method of the embodiment of the invention.
The reference numeral explanation
The CD of 200-DVD-RAM form; The 202-optical read head; The 204-Opticaldisk data detecting system; The 206-code translator.
The CD of 300-DVD-RAM form; The 302-optical read head;
The 304-Opticaldisk data detecting system; The 306-code translator.
402-presynchronization signal generator; The 404-clock counter; The 406-phaselocked loop;
408-synchronous detection window generator; The 410-sync generator; 412-signal frame counter;
The false sync generator of 414-; 416-data area signal generator.
S601～S617-step.
Embodiment
Please refer to Fig. 3 and be structural drawing according to embodiment of the invention CD-ROM drive 30.CD-ROM drive 30 comprises an optical read head 302, an Opticaldisk data detecting system 304 and a code translator 306.Optical read head 302 read in the CD 300 of DVD-RAM form come source data after, then Opticaldisk data detecting system 304 every detections come a data area of source data, can produce synchronization pulse, a false synchronization pulse and a data area signal of several signal frames, and output to code translator 306.At last, 306 in code translator is according to these several synchronization pulses, this false synchronization pulse data area signal therewith, with this data area decoding.Below describe Opticaldisk data detecting system 304 in detail with Fig. 4 and Fig. 5, and the signal that produces.
Fig. 4 is the structural drawing of expression according to embodiment of the invention Opticaldisk data detecting system 304.Opticaldisk data detecting system 304 comprises a presynchronization signal generator 402, a clock counter 404, a phaselocked loop (phase lock loop, PLL) 406, one synchronous detection window generator 408, one synchronous signal generator 410, a signal frame counter 412, one false sync generator 414 and a data area signal generator 416.The sequential chart of the signal that Opticaldisk data detecting system 304 is produced as shown in Figure 5.Presynchronization signal generator 402 is according to source Data Detection one presynchronization data, and the presynchronization data have 48 bit channel positions (channel bit), and its pattern (pattern) is 0,000 0,100 0,100 1,000 0,010 00,010,010 0,000 1,000 0,010 0,001 0000.When presynchronization signal generator 402 detects one of following four kinds of situations person, then judge and detect the presynchronization data, and send a presynchronization pulse signal (being Fig. 5 (a)), notify false sync generator 414, synchronous detection window generator 408, sync generator 410 and data area signal generator 416.
First kind of situation is to be 1,000 1000 8 bit channel positions when detecting pattern, then detect the 48 bit channel positions all identical with the pattern of presynchronization data after, send the presynchronization pulse signal immediately.Second kind of situation is to be 1,000 1000 8 bit channel positions when detecting pattern, when then detecting identical 24 bit channel positions, preceding 24 bit channel positions in the pattern with the presynchronization data (promptly 0,000 0,100 0,100 1,000 0,010 0001), then after the time of 24 clocks of clock counter 404 countings, send the presynchronization pulse signal.The third situation is to be 1,000 1000 8 bit channel positions when detecting pattern, when then detecting identical 24 bit channel positions, 24 bit channel positions, end in the pattern with the presynchronization data (promptly 0,010 0,000 1,000 0,010 00010000), send the presynchronization pulse signal immediately.The 4th kind of situation is to be 1,000 1000 8 bit channel positions when detecting pattern, when then detecting the 6 bit channel positions identical with the preceding 6 bit channel positions of the pattern of presynchronization data (promptly 0,000 01), then after the time of 42 clocks of clock counter 404 countings, send the presynchronization pulse signal.Wherein, above-mentioned each clock is produced by phaselocked loop 406.
When false sync generator 414 is received the presynchronization pulse signal, after postponing one first special time length (T1), false sync generator 414 produces a false synchronization pulse (being Fig. 5 (b)), and notification signal frame counter 412 begins counting by 1.
When synchronous detection window generator 408 was received the presynchronization pulse signal, then generation time length was the synchronous detection window (being the pulse width of T1+T2) that the first special time length (T1) adds one second special time length (T2).Wherein the first special time length can be the time of 32 clocks of clock counter 212 countings, and the second special time length is the time that clock counter 404 countings are no more than 90 clocks, and 32 clocks and 90 clocks are to be produced by phaselocked loop 406.
After sync generator 410 is received the presynchronization pulse signal, then according to the synchrodata of each signal frame in Data Detection one data area, source, and when detecting the synchrodata of each signal frame in the data area at every turn, then send a synchronization pulse immediately, and notification signal frame counter 412.And sync generator 410 only detects the synchrodata of first signal frame in the data area in the time span (T1+T2) of synchronous detection window.If when detecting the synchrodata of first signal frame, then sync generator 410 sends a synchronization pulse immediately, and notification signal frame counter 412 begins counting by 1.With Fig. 5 is example, the position that the synchrodata of first signal frame is detected the soonest, be after the first special time length of synchronous detection window, its position is (d) in the position, and if in the second special time length of synchronous detection window, just be detected, for example in the position (e) when being detected, then (e) sends synchronization pulse in the position immediately.
Data area signal generator 416 is in order to produce a data area signal (see figure 5).After data area signal generator 416 is received the presynchronization pulse signal, data area signal generator 416 is promoted the data area signal and is high logic level (H) by low logic level (L), and when the counting of signal frame counter 412 is 26, after then notification data regional signal generator 416 postponed a special time, the data area signal by high logic level low logic level was fallen back.At the data area signal is the position of high logic level, and promptly representing this moment, to come source data be the data of data area, and is the position of low logic level at the data area signal, and promptly represent the source data of receiving at this moment of coming is not the data of data area.So code translator 306 can utilize the high low logic level of data area signal to find out the position of data area.
The present invention is after sending the presynchronization pulse signal, after postponing the first special time length again, send false synchronization pulse, even in the time can't detecting the synchrodata of first signal frame in the data area, also available false synchronization pulse, the synchronization pulse that replaces first signal frame that should send, and the decoding data zone is come in the position that code translator 306 sends according to false synchronization pulse.And if after false synchronization pulse sends, just detect the synchrodata of first signal frame, and when sending the synchronization pulse of first signal frame, then code translator 306 is ignored false synchronization pulse, and, come the decoding data zone according to the position that the synchronization pulse of first signal frame sends.
Fig. 6 a, 6b, 6c are the process flow diagrams according to the data of optical disk detection method of the embodiment of the invention.The data of optical disk detection method comprises step S601～S617.Please refer to Fig. 6 a, 6b, the data of optical disk detection method at first detects presynchronization data at step S601, then in step S602, judge whether to detect earlier pattern and be 1,000 1000 8 bit channel positions, and detected afterwards and the whole 48 identical bit channel positions of the pattern of presynchronization data.To detect pattern earlier be 1,000 1000 8 bit channel positions if having, and when detecting the identical 48 bit channel positions of pattern with the presynchronization data afterwards, then immediately in step S606, sends a presynchronization pulse signal.
If do not detect pattern earlier is 1,000 1000 8 bit channel positions, and detected the 48 bit channel positions identical afterwards with the pattern of presynchronization data, then in step S603, judge whether to detect earlier pattern and be 1,000 1000 8 bit channel positions, and detected the 24 identical bit channel positions of preceding 24 bit channel positions in the pattern with the presynchronization data afterwards.To detect pattern earlier be 1,000 1000 8 bit channel positions if having, and detected 24 identical bit channel positions of preceding 24 bit channel positions in the pattern with the presynchronization data afterwards, then accumulative total 24 clocks in step S607 send the presynchronization pulse signal again in step S606
If do not detect pattern earlier is 1,000 1000 8 bit channel positions, and detected 24 identical bit channel positions of preceding 24 bit channel positions in the pattern with the presynchronization data afterwards, then in step S604, judge whether to detect earlier pattern and be 1,000 1000 8 bit channel positions, and detected the 24 identical bit channel positions of 24 bit channel positions, end in the pattern with the presynchronization data afterwards.To detect pattern earlier be 1,000 1000 8 bit channel positions if having, and detected the 24 identical bit channel positions of 24 bit channel positions, end in the pattern with the presynchronization data afterwards, then sends the presynchronization pulse signal immediately in step S606.
If do not detect pattern earlier is 1,000 1000 8 bit channel positions, and detected 24 identical bit channel positions of 24 bit channel positions, end in the pattern with the presynchronization data afterwards, then in step S605, judge whether to detect earlier pattern and be 1,000 1000 8 bit channel positions, and detected the 6 identical bit channel positions of preceding 6 bit channel positions in the pattern with the presynchronization data afterwards.To detect pattern earlier be 10001000 8 bit channel positions if having, and detected 6 identical bit channel positions of preceding 6 bit channel positions in the pattern with the presynchronization data afterwards, then in step S608, accumulative total 42 clocks send the presynchronization pulse signal again in step S606.
If do not detect pattern earlier is 1,000 1000 8 bit channel positions, and detects the 6 identical bit channel positions of preceding 6 bit channel positions in the pattern with the presynchronization data afterwards, then finishes the data of optical disk detection method.After in step S606, sending the presynchronization pulse signal, in step S609, the data area signal sets is high logic level after, then to step S610.
Please refer to Fig. 6 c, in step S610, detect the synchrodata of first signal frame in the data area.Then in step S611, postpone to send a false synchronization pulse after the one first special time length (for example 32 clocks), and in step S612, judge whether in one second special time length, to detect the synchrodata of first signal frame.If the synchrodata that detects first signal frame is arranged, then in step S613, send a synchronization pulse immediately; If do not detect the synchrodata of first signal frame, then then in step S614, by counting at the beginning.
In step S615, detect the 2nd synchrodata in the data area then to the 26th signal frame.In step S616, whenever when detecting a synchrodata, then send a synchronization pulse and counting increase by.Then in step S617 when counting when being 26, then the data area signal sets is a low logic level, finishes the data of optical disk detection method at last.
Though embodiments of the invention disclose as above; right its is not in order to qualification the present invention, any those who are familiar with this art, without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking accompanying the claim person of defining.
Claims (6)
1. Opticaldisk data detecting system, be applicable to the data of optical disk of detection digital versatile disc-random access memory form, the data of optical disk of above-mentioned digital versatile disc-random access memory form comprises presynchronization data and data area, wherein, above-mentioned data area comprises a plurality of signal frames, each signal frame comprises a synchrodata and a data block again, and above-mentioned Opticaldisk data detecting system comprises:
One presynchronization signal generator when detecting above-mentioned presynchronization data, then produces a presynchronization pulse signal;
One synchronous detection window generator, when receiving above-mentioned presynchronization pulse signal, then generation time length is the synchronous detection window that the above-mentioned first special time length adds one second special time length;
One false sync generator, when receiving above-mentioned presynchronization pulse signal, above-mentioned false sync generator produces a false synchronization pulse after one first special time length;
One synchronous signal generator, after receiving above-mentioned presynchronization pulse signal, then above-mentioned sync generator whenever when the synchrodata of a signal frame that detects above-mentioned a plurality of signal frames, produces the synchronization pulse of a signal frame;
One signal frame counter, after the synchronization pulse of the 1st signal frame in above-mentioned a plurality of signal frames or above-mentioned false synchronization pulse send, then above-mentioned signal frame counter begins counting by 1, and after the synchronization pulse of signal frame after the 1st signal frame in above-mentioned a plurality of signal frames sent, the counting of then above-mentioned signal frame counter is each to increase by 1; And
One data area detecting device, in order to produce a data area signal, when above-mentioned data area detecting device receives above-mentioned presynchronization pulse signal, then above-mentioned data area signal is promoted to high logic level by low logic level, and be 26 o'clock at the counting of above-mentioned signal frame counter, then above-mentioned data area signal is reduced to low logic level by high logic level.
2. Opticaldisk data detecting system as claimed in claim 1, above-mentioned sync generator are in the time span of above-mentioned synchronous detection window, detect the synchrodata of the 1st signal frame in above-mentioned a plurality of signal frame.。
3. Opticaldisk data detecting system as claimed in claim 1, wherein, above-mentioned presynchronization signal generator is that to detect pattern earlier be 1,000 1000 8 bit channel positions, and detected 24 identical bit channel positions of 24 bit channel positions, end in the pattern with above-mentioned presynchronization data afterwards, then detect above-mentioned presynchronization data.
4. signal generating method, according to the data of optical disk of digital versatile disc-random access memory form to produce signal, the data of optical disk of above-mentioned digital versatile disc-random access memory form comprises presynchronization data and data area, wherein, above-mentioned data area comprises a plurality of signal frames, each signal frame comprises a synchrodata and a data block again, and above-mentioned signal generating method comprises:
When detecting above-mentioned presynchronization data, then produce a presynchronization pulse signal;
After above-mentioned presynchronization pulse signal produced, producing a time length was the synchronous detection window that one first special time length adds one second special time length;
After the above-mentioned first special time length that above-mentioned presynchronization pulse signal produces, produce a false synchronization pulse; During the synchrodata of every signal frame in detecting above-mentioned a plurality of signal frame, then produce a synchronization pulse;
Behind the synchronization pulse or above-mentioned false synchronization pulse generation of the 1st signal frame in above-mentioned a plurality of signal frames, then begin counting by 1, and after the synchronization pulse of signal frame after the 1st signal frame in above-mentioned a plurality of signal frames sent, then counting is each increased by 1;
Produce a data area signal;
When above-mentioned presynchronization pulse signal generation, then above-mentioned data area signal is promoted to high logic level by low logic level; And
And be 26 o'clock at above-mentioned counting, then above-mentioned data area signal is reduced to low logic level by high logical bit.
5. signal generating method as claimed in claim 4 is in the time span of above-mentioned synchronous detection window, produces the synchronization pulse of the 1st signal frame in above-mentioned a plurality of signal frame.
6. signal generating method as claimed in claim 4, wherein, produce the step of above-mentioned presynchronization pulse signal, be that to detect pattern earlier be 1,000 1000 8 bit channel positions, and detected 24 identical bit channel positions of preceding 24 bit channel positions in the pattern with above-mentioned presynchronization data afterwards, then produce above-mentioned presynchronization pulse signal.
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