CN103035264B - Data recovery device and method - Google Patents
Data recovery device and method Download PDFInfo
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- CN103035264B CN103035264B CN201110304091.4A CN201110304091A CN103035264B CN 103035264 B CN103035264 B CN 103035264B CN 201110304091 A CN201110304091 A CN 201110304091A CN 103035264 B CN103035264 B CN 103035264B
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Abstract
The invention relates to a data recovery device and a method. The data recovery device comprises a filter, a dip angle detecting unit, a dip angle removal unit and a data converting unit. Filtering processing is carried out by the filter to radio frequency data, and an original data flow is generated. The dip angle detecting device uses a first data flow, a second date flow, a third data flow and a fourth data flow to combine a tangent line push-pull data flow, and generates a dip angle direction signal according to symmetrical characteristics of curved lines formed by the tangent line push-pull data flow. The dip angle removal unit detects a plurality of ascending sectors and a plurality of descending sectors on the original data flow, and repairs a plurality of data points, corresponding to the plurality of ascending sectors or the plurality of descending sectors, of the original data flow according to the dip angle direction signal, and a dip angle repairing data flow is generated. The data converting unit restores the dip angle repairing data flow to a modulating signal.
Description
Technical field
The invention relates to a kind of data recovery device and method, and relate to a kind of data recovery device and method of optical memory system especially.
Background technology
In optical memory system, by optical read head read radio frequency (RadioFrequency, the RF) signal on CD-RW discsCD-RW surface, via after the process of data recovery device, just must can solve the modulation signal representing authentic data and clock pulse signal.In the reading of signal, radiofrequency signal often can be subject to other interference and produce distortion, and then causes data recovery device cannot solve the modulation signal representing authentic data, such as: error of tilt (tilt error).
Generally common error of tilt has following two kinds, comprise the radial rake error (Radial tilt error) shown in Figure 1A, and the tangent line error of tilt (Tangential tilt error) shown in Figure 1B, wherein Reference numeral 110 is in order to indicate CD-RW discsCD-RW, and Reference numeral 120 is in order to indicate the track of CD-RW discsCD-RW.As shown in Figure 1A, radial rake error is that the normal 130 of light and radial direction exists an angle [alpha], and mainly caused by the variation of disc-shaped.Moreover as shown in Figure 1B, tangent line error of tilt is that the normal 140 of light and tangential direction exists an angle beta, and be because caused by movement factory assembly failure mostly.
In order to solve the problem of error of tilt, U.S. Patent Bulletin the 6th, 282, No. 161 disclose one " Tilt adjusting method and apparatus using jitter feedback ".The light angle that this section of patent mainly utilizes displacement sensor (displacement sensor) to observe video disc to reflect, to learn the direction of inclination.Afterwards, recycle inclination angle CD-ROM drive motor (tilt driving motor) and adjust object lens accordingly, to improve the quality of light path thus.But this kind of practice additionally must arrange displacement sensor and inclination angle CD-ROM drive motor, and the manufacturing cost of optical read head therefore can be caused too high.In other words, this kind of practice cannot be applied in DVD player at a low price, and then the range of application of limit optical read head.
Summary of the invention
The invention provides a kind of data recovery device, by the elimination of tangent line error of tilt, what promote radiofrequency signal can identification.In addition, data recovery device of the present invention additionally need not arrange displacement sensor and inclination angle CD-ROM drive motor, therefore can reduce the manufacturing cost of system.
The invention provides a kind of data restoration method, utilize tangent line to recommend data stream to differentiate the offset direction at tangent line inclination angle, and according to differentiating that result compensates the data point producing skew.Thus, what can promote radiofrequency signal can identification.
The present invention proposes a kind of data recovery device, in order to the rf data stream in optical memory system is reduced into a modulation signal, wherein this rf data stream is converted by a radiofrequency signal, and this radiofrequency signal is obtained multiple electric signal computing, and this data recovery device comprises:
One wave filter, carries out filtering process to this rf data stream, to produce an original data stream;
One inclination angle detecting unit, receive one the first to one the 4th data stream come by described transform electric, and utilize this first to the 4th data stream to synthesize a tangent line to recommend data stream, wherein this inclination angle detecting unit produces an inclination direction signal according to the symmetry of being recommended the curve that data stream is formed by this tangent line;
Unit is eliminated at one inclination angle, detect multiple rising section of this original data stream and multiple decline section, and repair corresponding described rising section or multiple data points of described decline section in this original data stream, to produce an inclination angle repair data stream according to this inclination direction signal; And
One Date Conversion Unit, is reduced into this modulation signal by this inclination angle repair data stream.
In other words, the present invention proposes a kind of data recovery device, in order to the rf data stream in optical memory system is reduced into modulation signal.Wherein, rf data stream is converted by radiofrequency signal, and radiofrequency signal is added by multiple electric signal and obtains.In addition, data recovery device comprises wave filter, inclination angle detecting unit, inclination angle elimination unit and Date Conversion Unit.Wave filter radio frequency data stream carries out filtering process, to produce original data stream.Inclination angle detecting unit receives first to fourth data stream come by these transform electric, and utilizes first to fourth data stream synthesis tangent line to recommend data stream.In addition, inclination angle detecting unit produces inclination direction signal according to the symmetry of being recommended the curve that data stream is formed by tangent line.Moreover, multiple rising section of unit detecting original data stream and multiple decline section are eliminated in inclination angle, and repair these rising sections corresponding or multiple data points of these decline sections in original data stream, to produce an inclination angle repair data stream according to inclination direction signal.Inclination angle repair data stream is reduced into modulation signal by Date Conversion Unit.
In one embodiment of this invention, above-mentioned inclination angle detecting unit comprises first adder, second adder, subtracter and detector.First data stream is added with the 4th data stream by first adder.Second data stream is added with the 3rd data stream by second adder.Subtracter is electrically connected first adder and second adder, and the data stream produced by first adder deducts the data stream that second adder produces, and recommends data stream to produce tangent line.Detector detecting tangent line recommends minimum number strong point in data stream and maximum number strong point, and foundation minimum number strong point and maximum number strong point produce inclination direction signal.
In one embodiment of this invention, above-mentioned inclination angle is eliminated unit and is comprised rising edge detector, falling edge detector and phase comparator.These rising sections of rising edge detector detecting original data stream, to produce rising clock pulse.These decline sections of falling edge detector detecting original data stream, to produce decline time clock.Phase comparator chooses one as reference clock pulse according to inclination direction signal from rising clock pulse and decline time clock, and benchmark time clock repairs original data stream, to produce inclination angle repair data stream.
From another viewpoint, the present invention proposes a kind of data restoration method, in order to the rf data stream in optical memory system is reduced into a modulation signal, wherein this rf data stream is converted by a radiofrequency signal, and this radiofrequency signal is obtained multiple electric signal computing, this data restoration method comprises:
Filtering process is carried out to this rf data stream, to produce an original data stream;
Receive one the first to one the 4th data stream come by described transform electric;
Utilize this first to the 4th data stream to synthesize a tangent line and recommend data stream, and produce an inclination direction signal according to the symmetry of being recommended the curve that data stream is formed by this tangent line;
Detect multiple rising section of this original data stream and multiple decline section, and repair corresponding described rising section or multiple data points of described decline section in this original data stream, to produce an inclination angle repair data stream according to this inclination direction signal; And
This inclination angle repair data stream is reduced into this modulation signal.
In other words, from another viewpoint, the present invention proposes a kind of data restoration method, in order to the rf data stream in optical memory system is reduced into modulation signal.Wherein, rf data stream is converted by a radiofrequency signal, and radiofrequency signal is added by multiple electric signal and obtains.In addition, described data restoration method comprises the following steps.Radio frequency data stream carries out filtering process, to produce original data stream.In addition, first to fourth data stream come by these transform electric is received.Then, utilize first to fourth data stream synthesis tangent line to recommend data stream, and produce inclination direction signal according to the symmetry of being recommended the curve that data stream is formed by tangent line.Moreover, multiple rising section of detecting original data stream and multiple decline section, and repair these rising sections corresponding or multiple data points of these decline sections in original data stream, to produce inclination angle repair data stream according to inclination direction signal.Finally, inclination angle repair data stream is reduced into modulation signal.
Based on above-mentioned, the present invention utilizes inclination angle detecting unit to recommend data stream to synthesize tangent line, and utilizes tangent line to recommend data stream to differentiate the offset direction at tangent line inclination angle.Thus, inclination angle is eliminated the unit inclination direction signal that can produce according to inclination angle detecting unit and is compensated for the data point producing skew, so lifting radiofrequency signal can identification.In addition, the present invention need not additionally arrange displacement sensor and inclination angle CD-ROM drive motor just can eliminate tangent line error of tilt, and then contributes to the manufacturing cost of reduction system.Moreover the present invention can not be limited to the restriction of optical element, and then can be applicable on any optical read head.
For above-mentioned feature and advantage of the present invention can be become apparent, special embodiment below, and coordinate appended accompanying drawing to be described in detail below.
Accompanying drawing explanation
Figure 1A and Figure 1B is respectively the schematic diagram that error of tilt is described.
Fig. 2 is the oscillogram of the radiofrequency signal according to one embodiment of the invention.
Fig. 3 is according to the optical detector of one embodiment of the invention and the relative schematic diagram of luminous point travel direction.
Fig. 4 A to Fig. 4 C is the oscillogram of the tangent line push-pull signal according to one embodiment of the invention respectively.
Fig. 5 is the block schematic diagram of the data recovery device according to one embodiment of the invention.
Fig. 6 is the block schematic diagram of the inclination angle detecting unit according to one embodiment of the invention.
Fig. 7 is the block schematic diagram of the inclination angle elimination unit according to one embodiment of the invention.
Fig. 8 A and Fig. 8 B be respectively according to one embodiment of the invention in order to illustrate that the waveform schematic diagram of unit is eliminated at inclination angle.
Fig. 9 is the schematic diagram of the original data stream according to one embodiment of the invention.
Figure 10 is the process flow diagram of the data restoration method according to one embodiment of the invention.
[main element symbol description]
110: CD-RW discsCD-RW
120: track
130: the normal of radial direction
140: the normal of tangential direction
α, β: angle
S21, S22: curve
A, B, C, D: region
310,410: luminous point
TPP: tangent line push-pull signal
420: news hole
Vp, Vn: amplitude
500: data recovery device
510: wave filter
520: inclination angle detecting unit
530: unit is eliminated at inclination angle
540: Date Conversion Unit
541: digital equalizer
542: timing recovery circuit
543: Viterbi decoder
DT
rF: rf data stream
DT
a: the first data stream
DT
b: the second data stream
DT
c: the 3rd data stream
DT
d: the 4th data stream
DT
oR: original data stream
TDS: inclination direction signal
DT
rV: inclination angle repair data stream
SLRF: modulation signal
610,620: totalizer
630: subtracter
640: detector
DT
pP: tangent line recommends data stream
710: rising edge detector
720: falling edge detector
730: phase comparator
A81 ~ A84: rising section
CK71: rising clock pulse
A85 ~ A88: decline section
CK72: decline time clock
P11 ~ P13, P21 ~ P24, P31 ~ P34, P41 ~ P44, P51 ~ P54: the data point of original data stream
S110 ~ S150: in order to each steps flow chart of the data restoration method described in Figure 10 embodiment to be described.
Embodiment
The present invention is mainly by the elimination of tangent line error of tilt, and what promote radiofrequency signal can identification.Therefore, before the explanation embodiment of the present invention, the impact first caused with regard to tangent line error of tilt radio frequency signal is described.
Fig. 2 is the oscillogram of the radiofrequency signal according to one embodiment of the invention, and wherein curve S 21 is the radiofrequency signal not being subject to the impact of tangent line error of tilt, and curve S 22 is the radiofrequency signal under the impact of tangent line error of tilt.With reference to Fig. 2, when curve S 21 and curve S 22 stack compare time, the rising edge of curve S 22 is almost overlapped with the rising edge of curve S 21, and the falling edge of curve S 22 is then upwards offset from the falling edge of curve S 21.In other words, when radiofrequency signal is subject to affecting of tangent line error of tilt, the falling edge of radiofrequency signal or rising edge can produce skew, and then cause the falling edge of radiofrequency signal or rising edge to occur a phase differential.
In addition, it is the offset direction depending on tangent line inclination angle which edge in radiofrequency signal can produce skew.For example, as shown in Figure 1B, if light is towards tangential direction off-normal 140, then will form the tangent line error of tilt of positive dirction, and then cause the rising edge of radiofrequency signal to produce skew.Relatively, if light is the opposite direction off-normal 140 towards tangential direction, then will form the tangent line error of tilt of negative direction, and then cause the falling edge of radiofrequency signal to produce skew.
Therefore, in the compensation of tangent line error of tilt, the embodiment cited by the present invention first can determine the offset direction at tangent line inclination angle, compensates further more afterwards for the edge producing skew in radiofrequency signal.In addition, the embodiment cited by the present invention is the offset direction utilizing a tangent line push-pull signal (tangential push-pull signal) to differentiate tangent line inclination angle.Therefore, below the characteristic first with regard to tangent line push-pull signal is described.
Fig. 3 is according to the optical detector of one embodiment of the invention and the relative schematic diagram of luminous point travel direction.As shown in Figure 3, optical detector is divided into four regions A, B, C, D, produces electric signal S with the distribution for luminous point 310
a, S
b, S
c, S
d.Wherein, radiofrequency signal RF is by electric signal S
a, S
b, S
c, S
dbe added and obtain, that is RF=(S
a+ S
b+ S
c+ S
d).In addition, tangent line push-pull signal TPP is also via electric signal S
a, S
b, S
c, S
dsynthesis, and as shown in Equation 1:
TPP=[(S
a+ S
d)-(S
b+ S
c)] formula 1
Fig. 4 A to Fig. 4 C is the oscillogram of the tangent line push-pull signal according to one embodiment of the invention respectively, and the luminous point that wherein Reference numeral 410 and 420 is respectively on track is cheated (pit) with news.As shown in Figure 4 B, when without any tangent line error of tilt, luminous point 410 will be evenly distributed on track, and the energy therefore projecting each region A, B, C, D of optical detector is also evenly distributed.That is, the energy that the left side (region A and region D) of optical detector detects will equal the energy that its right-hand part (region B and region C) detects.Thus, the waveform of tangent line push-pull signal TPP will be symmetrical, that is the amplitude Vp of the positive half period of tangent line push-pull signal TPP is equal to the amplitude Vn of its negative half-cycle.
Moreover as shown in Figure 4 A, when there is the tangent line error of tilt of positive dirction, luminous point 410 cannot be evenly distributed on track.Now, the energy that the left side (region A and region D) of optical detector detects will be greater than the energy that its right-hand part (region B and region C) detects.Therefore, the waveform of tangent line push-pull signal TPP can not be symmetrical, and then cause the amplitude Vp of the positive half period of tangent line push-pull signal TPP to be less than the amplitude Vn of its negative half-cycle.Relatively, as shown in Figure 4 C, when there is the tangent line error of tilt of negative direction, the energy that the left side (region A and region D) of optical detector detects will be less than the energy that its right-hand part (region B and region C) detects, and then cause the amplitude Vp of the positive half period of tangent line push-pull signal TPP to be greater than the amplitude Vn of its negative half-cycle.In other words, the symmetry of foundation tangent line push-pull signal TPP can determine the offset direction at tangent line inclination angle.
After the impact that understanding tangent line error of tilt radio frequency signal causes, below based on foregoing, each embodiment will be described.
Fig. 5 is the block schematic diagram of the data recovery device according to one embodiment of the invention.With reference to Fig. 5, data recovery device 500 comprises wave filter 510, inclination angle detecting unit 520, inclination angle elimination unit 530 and Date Conversion Unit 540.Wherein, be reduced in the process of modulation signal SLRF in radiofrequency signal, radiofrequency signal first can convert digitized multiple sample data points to via analogy to digital quantizer.Relatively, the electric signal S that produces of optical detector
a, S
b, S
c, S
dalso digitized multiple sample data points can be converted respectively to by analogy to digital quantizer.
For convenience of description, in the following description, the multiple sample data points converted by radiofrequency signal will be defined as rf data stream DT
rF.In addition, by electric signal S
athe multiple sample data points converted will be defined as the first data stream DT
a, by electric signal S
bthe multiple sample data points converted will be defined as the second data stream DT
b, by electric signal S
cthe multiple sample data points converted will be defined as the 3rd data stream DT
c, and by electric signal S
dthe multiple sample data points converted will be defined as the 4th data stream DT
d.
Operationally, data recovery device 500 is in order to by rf data stream DT
rFbe reduced into modulation signal SLRF.At this, wave filter 510 can received RF data stream DT
rF, and radio frequency data stream DT
rFcarry out filtering process.Such as, wave filter 510 can filtering rf data stream DT
rFradio-frequency component, and produce an original data stream DT according to this
oR.On the other hand, inclination angle detecting unit 520 can receive first to fourth data stream DT
a~ DT
d, and utilize first to fourth data stream DT
a~ DT
dsynthesize a tangent line and recommend data stream DT
pP.Thus, inclination angle detecting unit 520 can recommend data stream DT according to by tangent line
pPthe symmetry of the curve formed to differentiate the offset direction at tangent line inclination angle, and can produce inclination direction signal TDS accordingly.
For example, Fig. 6 is the block schematic diagram of the inclination angle detecting unit according to one embodiment of the invention.With reference to Fig. 6, inclination angle detecting unit 520 comprises totalizer 610, totalizer 620, subtracter 630 and detector 640.At this, totalizer 610 can by the first data stream DT
awith the 4th data stream DT
dbe added, and totalizer 620 can by the second data stream DT
bwith the 3rd data stream DT
cbe added.In addition, subtracter 630 is electrically connected totalizer 610 and totalizer 620, and the data stream that totalizer 610 produces is deducted the data stream that totalizer 620 produces, and recommends data stream DT to produce tangent line
pP.In other words, DT
pP=(DT
a+ DT
d)-(DT
b+ DT
c).
Thus, data stream DT is recommended by tangent line
pPthe characteristic of tangent line push-pull signal that the curve formed will have cited by Fig. 4 A to Fig. 4 C.Therefore, detector 640 can recommend data stream DT according to by tangent line
pPthe symmetry of the curve formed is to produce inclination direction signal TDS.In the symmetric judgement of curve, detector 640 can detect tangent line and recommend data stream DT
pPin a minimum number strong point and a maximum number strong point.Thus, detector 640 can obtain the first amplitude of the positive half period amplitude representing curve according to maximum number strong point, and can obtain the second amplitude of the negative half-cycle amplitude representing curve according to minimum number strong point.Thus, the symmetry that can determine curve is compared by the first amplitude with the second amplitude.
As shown in Fig. 4 A to Fig. 4 C, when the first amplitude is less than the second amplitude, then represent the impact that radiofrequency signal is subject to the tangent line error of tilt of positive dirction.Therefore, detector 640 can produce the inclination direction signal TDS with the first level, eliminates unit 530 for original data stream DT to cause inclination angle
oRthe data point of middle corresponding rising section is repaired.Relatively, when the first amplitude is greater than the second amplitude, then represent the impact that radiofrequency signal is subject to the tangent line error of tilt of negative direction.Therefore, detector 640 can produce the inclination direction signal TDS with second electrical level, eliminates unit 530 for original data stream DT to cause inclination angle
oRthe data point of middle corresponding decline section is repaired.
Moreover eliminate unit 530 with regard to inclination angle, before the reparation carrying out data point, unit 530 is eliminated at inclination angle can first detect original data stream DT
oRmultiple rising section and multiple decline section, repair original data stream DT according to inclination direction signal TDS more afterwards
oRthese rising sections of middle correspondence or multiple data points of these decline sections, and produce an inclination angle repair data stream DT according to this
rV.
For example, Fig. 7 is the block schematic diagram of the inclination angle elimination unit according to one embodiment of the invention.As shown in Figure 7, elimination unit 530 in inclination angle comprises rising edge detector 710, falling edge detector 720 and phase comparator 730.In addition, Fig. 8 A and Fig. 8 B be respectively according to one embodiment of the invention in order to illustrate that the waveform schematic diagram of unit is eliminated at inclination angle.Referring to Fig. 7, Fig. 8 A and Fig. 8 B, rising edge detector 710 can detect original data stream DT
oRmultiple rising sections, such as: rising section A81 ~ A84, and produce rising clock pulse CK71 according to this.Thus, can from original data stream DT according to rising clock pulse CK71
oRin hunt out multiple data points of corresponding rising section A81 ~ A84.
In addition, falling edge detector 720 can detect original data stream DT
oRmultiple decline sections, such as: decline section A85 ~ A88, and produce decline time clock CK72 according to this.Thus, can from original data stream DT according to decline time clock CK72
oRin hunt out multiple data points of corresponding decline section A85 ~ A88.On the other hand, phase comparator 730 can choose one as reference clock pulse according to inclination direction signal TDS from rising clock pulse CK71 and decline time clock CK72, and benchmark time clock repairs original data stream DT
oR, to produce inclination angle repair data stream DT
rV.
For example, Fig. 9 is the schematic diagram of the original data stream according to one embodiment of the invention, wherein original data stream DT
oRcomprise data point P11 ~ p13, P21 ~ P24, P31 ~ P34, P41 ~ P44 and P51 ~ P54.At this, data point P11 ~ P13, P31 ~ P34 and P51 ~ P54 is corresponding original data stream DT
oRrising section, and data point P21 ~ P24 and P41 ~ P44 is then corresponding original data stream DT
oRdecline section.
When there is the tangent line error of tilt of positive dirction, phase comparator 730 will receive the inclination direction signal TDS with the first level.Now, phase comparator 730 will select rising clock pulse CK71 as reference clock pulse, to repair original data stream DT
oRdata point P11 ~ P13, P31 ~ P34 and P51 ~ P54 of middle corresponding rising section.Relatively, when there is the tangent line error of tilt of negative direction, phase comparator 730 will receive the inclination direction signal TDS with second electrical level.Now, phase comparator 730 using selection decline time clock CK72 as reference clock pulse, to repair original data stream DT
oRdata point P21 ~ P24 and P41 ~ P44 of middle corresponding decline section.
Continue referring to Fig. 5, for the inclination angle repair data stream DT that inclination angle elimination unit 530 produces
rV, Date Conversion Unit 540 can be reduced into a modulation signal SLRF.For example, Date Conversion Unit 540 comprises digital equalizer 541, timing recovery circuit (timing recoverycircuit) 542 and Viterbi decoder (Viterbi decoder) 543.Wherein, digital equalizer 541 can compensate inclination angle repair data stream DT
rVyield value.Timing recovery circuit 542 is the inclination angle repair data stream DT after foundation compensates
rVproduce (retiming) data stream when a time clock resets.Finally, Viterbi decoder 543 will be decoded to time clock retimed data stream, to produce modulation signal SLRF.
Figure 10 is the process flow diagram of the data restoration method according to one embodiment of the invention, and wherein said data restoration method is in order to the rf data stream in optical memory system is reduced into modulation signal.In addition, described rf data stream is converted by radiofrequency signal, and radiofrequency signal is added by multiple electric signal and obtains.With reference to Figure 10, in the process of data convert, as shown in step S110 and step S120, radio frequency data stream carries out filtering process to produce original data stream, and receives first to fourth data stream come by described multiple transform electric.
In addition, as shown in step S130, utilize first to fourth data stream synthesis tangent line to recommend data stream, and produce inclination direction signal according to the symmetry of being recommended the curve that data stream is formed by tangent line.Then, as shown in step s 140, multiple rising section of detecting original data stream and multiple decline section, and repair these rising sections corresponding or multiple data points of these decline sections in original data stream, to produce inclination angle repair data stream according to inclination direction signal.Moreover, as shown in step 150, inclination angle repair data stream is reduced into modulation signal.Detailed process as each step of this enforcement has been included in each embodiment above-mentioned, therefore does not repeat them here.
In sum, the present invention utilizes inclination angle detecting unit to recommend data stream to synthesize tangent line, and utilizes tangent line to recommend data stream to differentiate the offset direction at tangent line inclination angle.Thus, inclination angle eliminate unit can according to the differentiation result of inclination angle detecting unit for produce skew data point compensate, and then promote radiofrequency signal can identification.In addition, the present invention need not additionally arrange displacement sensor and inclination angle CD-ROM drive motor just can eliminate tangent line error of tilt, and then contributes to the manufacturing cost of reduction system.Moreover data recovery device of the present invention can not be limited to the restriction of optical element, and then can be applicable on any optical read head.
Although the present invention discloses as above with embodiment; so itself and be not used to limit the present invention; without departing from the spirit and scope of the present invention, when doing a little change and retouching, therefore protection scope of the present invention is when being as the criterion of defining depending on claim for any those skilled in the art.
Claims (10)
1. a data recovery device, in order to the rf data stream in optical memory system is reduced into a modulation signal, wherein this rf data stream is converted by a radiofrequency signal, and this radiofrequency signal is obtained multiple electric signal computing, and this data recovery device comprises:
One wave filter, carries out filtering process to this rf data stream, to produce an original data stream;
One inclination angle detecting unit, receive one the first to one the 4th data stream come by described transform electric, and utilize this first to the 4th data stream to synthesize a tangent line to recommend data stream, wherein this inclination angle detecting unit produces an inclination direction signal according to the symmetry of being recommended the curve that data stream is formed by this tangent line;
Unit is eliminated at one inclination angle, detect multiple rising section of this original data stream and multiple decline section, and repair corresponding described rising section or multiple data points of described decline section in this original data stream, to produce an inclination angle repair data stream according to this inclination direction signal; And
One Date Conversion Unit, is reduced into this modulation signal by this inclination angle repair data stream,
Wherein this inclination angle detecting unit comprises:
One first adder, is added this first data stream with the 4th data stream;
One second adder, is added this second data stream with the 3rd data stream;
One subtracter, is electrically connected this first adder and this second adder, and the data stream that this first adder produces is deducted the data stream that this second adder produces, and recommends data stream to produce this tangent line; And
One detector, detects this tangent line and recommends a minimum number strong point in data stream and a maximum number strong point, and produce this inclination direction signal according to this minimum number strong point and this maximum number strong point.
2. data recovery device according to claim 1, wherein this detector obtains one first amplitude according to this maximum number strong point, and obtain one second amplitude according to this minimum number strong point, and when this first amplitude is greater than this second amplitude, this detector produces this inclination direction signal with one first level, the described data point that unit repairs corresponding described rising section in this original data stream is eliminated to cause this inclination angle, when this first amplitude is less than this second amplitude, this detector produces this inclination direction signal with a second electrical level, the described data point that unit repairs corresponding described decline section in this original data stream is eliminated to cause this inclination angle.
3. data recovery device according to claim 1, wherein elimination unit in this inclination angle comprises:
One rising edge detector, detects the described rising section of this original data stream, to produce a rising clock pulse;
One falling edge detector, detects the described decline section of this original data stream, to produce a decline time clock; And
One phase comparator, chooses one as a reference clock pulse according to this inclination direction signal, and repairs this original data stream according to this reference clock pulse from this rising clock pulse and this decline time clock, to produce this inclination angle repair data stream.
4. data recovery device according to claim 3, wherein this phase comparator is according to this inclination direction signal with one first level, select this rising clock pulse as this reference clock pulse, to repair the described data point of corresponding described rising section in this original data stream, and this phase comparator is according to this inclination direction signal with a second electrical level, select this decline time clock as this reference clock pulse, to repair the described data point of corresponding described decline section in this original data stream.
5. data recovery device according to claim 1, wherein this Date Conversion Unit comprises:
One digital equalizer, compensates the yield value of this inclination angle repair data stream;
One timing recovery circuit, according to the raw time clock retimed data stream of this inclination angle repair data miscarriage after compensation; And
One Viterbi decoder, decodes to this time clock retimed data stream, to produce this modulation signal.
6. a data restoration method, in order to the rf data stream in optical memory system is reduced into a modulation signal, wherein this rf data stream is converted by a radiofrequency signal, and this radiofrequency signal is obtained multiple electric signal computing, and this data restoration method comprises:
Filtering process is carried out to this rf data stream, to produce an original data stream;
Receive one the first to one the 4th data stream come by described transform electric;
Utilize this first to the 4th data stream to synthesize a tangent line and recommend data stream, and produce an inclination direction signal according to the symmetry of being recommended the curve that data stream is formed by this tangent line;
Detect multiple rising section of this original data stream and multiple decline section, and repair corresponding described rising section or multiple data points of described decline section in this original data stream, to produce an inclination angle repair data stream according to this inclination direction signal; And
This inclination angle repair data stream is reduced into this modulation signal,
Wherein utilize this first to the 4th data stream to synthesize this tangent line and recommend data stream, and comprise according to the step that the symmetry of recommending the curve that data stream is formed by this tangent line produces this inclination direction signal:
This first data stream is added with the 4th data stream;
This second data stream is added with the 3rd data stream;
The data stream obtained being added with the 4th data stream by this first data stream deducts and is added with the 3rd data stream by this second data stream and the data stream obtained, and produces this tangent line according to this and recommend data stream;
Detect this tangent line and recommend a minimum number strong point in data stream and a maximum number strong point; And
This inclination direction signal is produced according to this minimum number strong point and this maximum number strong point.
7. data restoration method according to claim 6, the step wherein producing this inclination direction signal according to this minimum number strong point and this maximum number strong point comprises:
Obtain one first amplitude according to this maximum number strong point, and obtain one second amplitude according to this minimum number strong point;
When this first amplitude is greater than this second amplitude, produce this inclination direction signal with one first level; And
When this first amplitude is less than this second amplitude, produce this inclination direction signal with a second electrical level.
8. data restoration method according to claim 6, wherein detect the described rising section of this original data stream and described decline section, and comprise according to the step that this inclination direction signal repairs corresponding described rising section or the described data point of described decline section in this original data stream:
Detect the described rising section of this original data stream, to produce a rising clock pulse;
Detect the described decline section of this original data stream, to produce a decline time clock; And
From this rising clock pulse and this decline time clock, choose one as a reference clock pulse according to this inclination direction signal, and repair this original data stream according to this reference clock pulse.
9. data restoration method according to claim 8, wherein from this rising clock pulse and this decline time clock, choose one as this reference clock pulse according to this inclination direction signal, and comprise according to the step that this reference clock pulse repairs this original data stream:
According to this inclination direction signal with one first level, select this rising clock pulse as this reference clock pulse, and repair the described data point of corresponding described rising section in this original data stream; And
According to this inclination direction signal with a second electrical level, select this decline time clock as this reference clock pulse, and repair the described data point of corresponding described decline section in this original data stream.
10. data restoration method according to claim 6, wherein comprises the step that this inclination angle repair data stream is reduced into this modulation signal:
Compensate the yield value of this inclination angle repair data stream;
According to the raw time clock retimed data stream of this inclination angle repair data miscarriage after compensation; And
This time clock retimed data stream is decoded, to produce this modulation signal.
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