CN101930771B - Data-restoring device and method - Google Patents
Data-restoring device and method Download PDFInfo
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- CN101930771B CN101930771B CN200910150735A CN200910150735A CN101930771B CN 101930771 B CN101930771 B CN 101930771B CN 200910150735 A CN200910150735 A CN 200910150735A CN 200910150735 A CN200910150735 A CN 200910150735A CN 101930771 B CN101930771 B CN 101930771B
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Abstract
The invention discloses a data-restoring device and method. The data-restoring device comprises an equalizer, a cutting circuit, a phase locked loop, a detecting circuit and a compensating circuit, wherein the equalizer receives radio-frequency signals, adjusts a radio-frequency signal according to compensating signals and outputs the equalized radio-frequency signal; the cutting circuit cuts the equalized radio-frequency signal according to a cutting level and outputs a plurality of alternating current radio-frequency signal sections; the phase locked loop receives the radio-frequency signal and outputs a clock according to the alternating current radio-frequency signal; the detecting circuit calculates and outputs the time widths of a plurality of signal sections according to the clock, and detects and outputs the sampling heights of a plurality of signal sections; and the compensating circuit selects the sampling heights of at least two signal sections from a plurality of signal sections according to the output of the detecting circuit to calculate the ratio, compares the ratio with the corresponding reference value and outputs a compensating signal according to the comparison result.
Description
Technical field
The present invention relates to a kind of data-restoring device and method, and be particularly related to a kind of data-restoring device and method that is applicable to optical memory system.
Background technology
General optical memory system, for example comprise laser disc (compact disks, CDs) or digital diversified laser disc (digital versatile disks; Laser laser disc such as DVDs); The use optical disc drive (optical disc drive, ODD), the operating period of its storage data of regenerating; Optical disc drive can send laser light in laser laser disc surface, and reads the signal that is reflected by laser laser disc surface.The signal that laser laser disc surface is read is radio frequency (radio frequency; RF) signal; Therefore comprising the non-linear channels, symbol intersymbol interference (the inter-symbol interference that have when defocusing; ISI), electrical delay, a large amount of surperficial scratches of producing back ejection formation aging or recording medium of dyestuff on the pit kenel on the recording medium, recording medium etc., cause identification bad, read out distortion data.In addition, if when need carry out the high power fast reading and get, the problem of symbol intersymbol interference can be more serious.
In order to take into account transfer rate and signal quality, existing optical memory system is in order to carry out reading of high power speed, and (partial response, technology PR) is to allow symbol intersymbol interference within the specific limits to use partial response usually.In detail, the accurate error of partial response method correction bit is to form the numerical data that can carry out data manipulation on it.(maximumlikelihood, ML) Viterbi of method (Viterbi) decoding mechanism is decoded as the numerical data of original storage with formed numerical data, in theory can be with error minimize, but be suitable complicated technology in realization by using maximum possible.For instance, Fig. 1 is the oscillogram of the frequency response of existing fetch channel.With reference to Fig. 1; Among actual optical memory system; The frequency response Ch_1 of actual fetch channel is neither similar with partial response channel PR1 and partial response channel PR2, will produce sizable error if use partial response channel PR1 or partial response channel PR2 to read.Comparatively speaking, if use partial response channel PR3 to read, then can promote the correctness of data.But realize a similar partial response channel, possibly need more cost and complex circuit design more, and often more dissimilar partial response channel simply mode realize.So how to compensate the frequency response of actual fetch channel, its available more dissimilar partial response channel is read, be the main flow problem of studying at present.
Summary of the invention
Therefore; Embodiments of the invention provide a kind of data-restoring device; Wherein judge the channel characteristic of this radiofrequency signal of transmission by the sampling height (for example amplitude) of radiofrequency signal; The adjustment balanced device to adjust the frequency response of this radiofrequency signal, makes this radiofrequency signal to read with selected partial response channel in the gain escalating rate (roll-up rate) of the required compensation of designated frequency range; Can increase the recognition rate of this radiofrequency signal, and need not select the bigger specific part response channel of similarity degree at selected partial response channel.
One embodiment of the invention propose a kind of data-restoring device, and this data-restoring device comprises balanced device, clipper circuit, phase-locked loop, circuit for detecting and compensating circuit.Balanced device received RF signal and compensating signal, according to compensating signal adjustment radiofrequency signal, output balanced radio frequency signal.Clipper circuit connects balanced device, receives the balanced radio frequency signal, and clipper circuit cuts the balanced radio frequency signal according to cleavage is accurate, with the output AC radiofrequency signal, wherein exchanges radiofrequency signal and has a plurality of signal segments.The phase-locked loop connects clipper circuit, and the phase-locked loop receives and export clock according to the phase place of interchange radiofrequency signal.Circuit for detecting connects clipper circuit and phase-locked loop; And circuit for detecting receives and exchanges radiofrequency signal and clock; According to clock calculation and output AC radiofrequency signal in the time width of a plurality of signal segments, and circuit for detecting detecting and export the sampling height of a plurality of signal segments.Compensating circuit connects circuit for detecting and balanced device; And compensating circuit is selected the sampling high computational ratio of dqm signal section at least from a plurality of signal segments according to the output of circuit for detecting; And comparing ratio and corresponding reference value, compensating circuit is exported compensating signal according to comparative result.
In one embodiment of this invention, above-mentioned selected two signal segments of compensating circuit have the different time width.
In one embodiment of this invention, above-mentioned balanced device comprises the adaptive wave filter.The adaptive wave filter connects clipper circuit, and the adaptive wave filter receives the frequency response that compensating signal is adjusted radiofrequency signal according to this, output balanced radio frequency signal.
In one embodiment of this invention, above-mentioned compensating circuit comprises gain calculating circuit and comparator circuit.Gain calculating circuit is connected to circuit for detecting, and the sampling high computational ratio of from a plurality of signal segments, selecting the dqm signal section is as the gain rate of descent.Comparator circuit connects gain calculating circuit, and comparator circuit receives ratio, and the relation of ratio and corresponding reference value relatively, exports compensating signal according to this.
In one embodiment of this invention, above-mentioned compensating circuit comprises gain calculating circuit and comparator circuit.Gain calculating circuit is connected to circuit for detecting; And gain calculating circuit is divided into m signal segment group with a plurality of signal segments according to time width; Each signal segment group comprises k signal segment with identical time width; K the sampling average height that gain calculating circuit is calculated in the middle of above-mentioned each signal segment group produces mean value of amplitude, and by selecting its two ratio calculated in above-mentioned m the pairing m of the signal segment group mean value of amplitude at least as the gain rate of descent, wherein m and k are positive integer.Comparator circuit connects gain calculating circuit, and comparator circuit receiving gain rate of descent ratio, and the operation result of calculated gains rate of descent ratio and corresponding reference value, exports compensating signal according to this.
In one embodiment of this invention, data-restoring device also comprises the bit stream generator, and this bit stream generator connects clipper circuit and this phase-locked loop, with reference to exchanging radiofrequency signal and clock, output bit flow.
One embodiment of the invention propose a kind of data recovery method, and the step of this data recovery method comprises according to compensating signal adjustment radiofrequency signal, obtains the balanced radio frequency signal.Then, according to the accurate cutting of cleavage balanced radio frequency signal,, wherein exchange radiofrequency signal and have a plurality of signal segments to obtain the interchange radiofrequency signal.Then, the phase place according to said interchange radiofrequency signal obtains a clock.Then, the time width of the said a plurality of signal segments of the said clock calculation of foundation.Then, detecting exchanges the sampling height of radiofrequency signal in a plurality of signal segments.Then, from a plurality of signal segments, select the sampling high computational ratio of dqm signal section at least.At last, compare ratio and corresponding reference value, and according to comparative result output compensating signal.
Based on above-mentioned; The present invention is through the frequency response of adjustment radiofrequency signal; Make radiofrequency signal to read, can increase the recognition rate of radiofrequency signal, also can reduce the cost that passage is set and reduce complex circuit design at selected partial response channel with selected partial response channel.
For letting the above-mentioned feature and advantage of the present invention can be more obviously understandable, hereinafter is special lifts embodiment, and cooperates appended graphic elaborating as follows.
Description of drawings
Fig. 1 is the oscillogram of the frequency response of existing fetch channel;
Fig. 2 is the calcspar according to a kind of data-restoring device of the first embodiment of the present invention;
Fig. 3 is the process flow diagram according to a kind of data recovery method that the first embodiment of the present invention provided;
Fig. 4 is the oscillogram according to a kind of analog balanced radiofrequency signal that the first embodiment of the present invention provided;
Fig. 5 is the process flow diagram according to a kind of data recovery method that the third embodiment of the present invention provided;
Fig. 6 is the process flow diagram according to a kind of data recovery method that the fourth embodiment of the present invention provided;
Fig. 7 is the calcspar according to a kind of data-restoring device of the fifth embodiment of the present invention;
Fig. 8 is a kind of the simulation in the oscillogram of the gain escalating rate of assigned frequency compensation RF signal according to fifth embodiment of the invention provided;
Fig. 9 is the oscillogram according to the RF signal of a kind of analog compensation gain escalating rate that fifth embodiment of the invention provided.
The main element symbol description
200: data-restoring device; 210: balanced device;
220: clipper circuit; 230: the phase-locked loop;
240: circuit for detecting; 250: compensating circuit;
700: data-restoring device; 710: balanced device;
711: the adaptive wave filter; 750: compensating circuit;
751: gain calculating circuit; 752: comparator circuit;
760: the bit stream generator; PR1, PR2, PR3: partial response channel;
CH_1: the frequency response of actual fetch channel; S310～S350: step;
S541, S542: step; S641～S643: step;
A
0～A
4: the sampling height; T
0～T
4: time width;
Z
0～Z
5: zero crossover point; RF
AC: exchange radiofrequency signal;
RF
EQ: the balanced radio frequency signal; Sc: compensating signal;
PCLK: clock.
Embodiment
Therefore, in an embodiment of the present invention, when receiving radiofrequency signal, utilize balanced device to carry out the adjustment of frequency response characteristic, produce the balanced radio frequency signal according to compensating signal.Utilize partitioning circuitry to carry out the segmentation of signal, the feasible sampling height and the time width that can define each signal segment.The phase-locked loop is in order to obtain the needed clock signal of definition time width.Then can be by circuit for detecting, calculate sampling height and time width between each signal segment, obtain the relation of sampling height and time period.Wherein, Since same time width may be because of externality corresponding a plurality of different samplings height; So circuit for detecting can be exported a plurality of amplitude signals, at this, an amplitude signal is exactly a signal that the corresponding a plurality of sampling height in identical time width the inside are formed.At last, utilize compensating circuit by according to the time width of circuit for detecting output and the relation of amplitude signal, calculated gains rate of descent (roll-off rate), and the difference of calculated gains rate of descent and corresponding reference value R are exported compensating signal according to this.
Accept above-mentioned because the frequency response of radiofrequency signal after over-compensation is more near the channel characteristic of selected partial response channel, therefore can be in order to increasing the reliability of radiofrequency signal, and the design of hardware also can be too complicated.Set forth embodiments of the invention in detail below with reference to accompanying drawing, the for example clear embodiments of the invention of accompanying drawing.In following explanation, for presenting consistency, so in various embodiment, if having function and the same or analogous element of structure to use components identical symbol and title to explanation of the present invention.
Fig. 2 is the calcspar according to a kind of data-restoring device of the first embodiment of the present invention.With reference to Fig. 2, among present embodiment, data-restoring device 200 comprises balanced device 210, clipper circuit 220, phase-locked loop 230, circuit for detecting 240 and compensating circuit 250.Wherein, clipper circuit 220 connects balanced device 210, phase-locked loop 230 and circuit for detecting 240, and phase-locked loop 230 connects circuit for detecting 240, and circuit for detecting 240 connects compensating circuit 250, and compensating circuit 250 connects balanced device 210.Below will introduce the detailed functions of above-mentioned each element.
Accept above-mentionedly, circuit for detecting 240 is in order to receive to exchange radiofrequency signal RF
ACAnd clock PCLK, calculate interchange radiofrequency signal RF according to clock PCLK
ACTime width in each signal segment, and circuit for detecting 240 samplings exchange radiofrequency signal RF
ACSampling height among each signal segment.In the present embodiment, " the sampling height " of aforementioned signal segment can be the amplitude of this signal segment.In another embodiment, circuit for detecting 240 can be taken a sample to a certain signal segment according to clock PCLK and obtained a plurality of sampling values, and from a plurality of sampling values of this signal segment, selects " the sampling height " of its maximum as aforementioned signal segment.Use the present embodiment person and can look its design requirement definition " sampling height ", for example use the gross sample value (or part sampling value) of same signal segment to remove to calculate its mean value with " sampling height " as this signal segment.
Compensating circuit 250 is selected wherein two signal segments at least from above-mentioned a plurality of signal segments, and calculates the ratio of the sampling height of this binary signal section.Through the comparison of this ratio with corresponding reference value R, compensating circuit 250 can obtain a comparative result and adjust compensating signal Sc according to comparative result, and compensating signal Sc is exported to balanced device 210.Below cooperate process flow diagram to do more detailed explanation.
Please with reference to Fig. 2 and Fig. 3, Fig. 3 is the process flow diagram according to a kind of data recovery method that the first embodiment of the present invention provided.At first, in step S310, balanced device 210 received RF signal RF and compensating signal Sc are according to the compensating signal Sc adjustment radiofrequency signal RF that compensating circuit 250 is returned, output balanced radio frequency signal RF
EQTo clipper circuit 220.In step S320, clipper circuit 220 is according to the accurate cutting of cleavage balanced radio frequency signal RF
EQ, with output AC radiofrequency signal RF
AC, wherein exchange radiofrequency signal RF
ACHave a plurality of signal segments.In step S330, circuit for detecting 240 receives and exchanges radiofrequency signal RF
AC, and detecting exchanges radiofrequency signal RF
ACSampling height in a plurality of signal segments.In step S340, compensating circuit 250 is selected wherein two signal segments at least from above-mentioned signal segment, and according to the sampling high computational ratio of above-mentioned two signal segments.In step S350, compensating circuit 250 compares the ratio and corresponding reference value R that aforementioned calculation goes out, and exports compensating signal Sc to balanced device 210 according to comparative result.
For instance, Fig. 4 is the oscillogram according to a kind of analog balanced radiofrequency signal that first embodiment of the invention provided.With reference to Fig. 2 and Fig. 4, when clipper circuit 220 receives balanced radio frequency signal RF
EQ, and according to preset position standard or radiofrequency signal RF
EQThe direct current position accurate when cutting as cleavage is accurate, can obtain balanced radio frequency signal RF
EQWith accurate a plurality of zero crossover point (zero-cross) Z that intersect of cleavage
0～Z
5, be a signal segment between wherein every adjacent two 0 crossover points, and clipper circuit 220 is according to above-mentioned cleavage brigadier balanced radio frequency signal RF
EQBe output as and exchange radiofrequency signal RF
AC
With reference to Fig. 2 and Fig. 4, circuit for detecting 240 receives and exchanges radiofrequency signal RF
ACAnd clock PCLK, calculate and exchange radiofrequency signal RF
ACIn the sampling height and the time width of each signal segment.That is to say that circuit for detecting 240 reference clock PCLK are to calculate zero crossover point Z
0To Z
1Between time width T
0And sampling height A
0, next detect zero crossover point Z
1To Z
2Between time width T
1And sampling height A
1, detect zero crossover point Z then
2To Z
3Between time width T
2And sampling height A
2, its rest may be inferred by analogy it.Circuit for detecting 240 can calculate time width T by clock PCLK
0Comprise three clocks (3T cycle), time width T
1Comprise three clocks (3T cycle), and time width T
2Comprise two clocks (2T cycle).
Compensating circuit 250 is selected wherein two signal segments, and for instance, compensating circuit 250 can be selected Z
0To Z
1Between signal segment and Z
2To Z
3Between signal segment, then with the sampling height A in above-mentioned two signal segments
0And sampling height A
2Carry out computing, can obtain a ratio (A for example
2/ A
0).Compensating circuit 250 also can select other to have two signal segments of different time width.
Through comparative result that corresponding reference value R obtained that presets of above-mentioned ratio contrast, compensating circuit 250 can be according to this comparative result output compensating signal Sc to balanced device 210.Above-mentioned preset corresponding reference value R also is replaced with the desirable relative ratio under this model frequency domain response in the lump when the part response model of conversion decoding.
Second embodiment is compared to data-restoring device and the method for first embodiment, and its main difference is the method by sampling high computational ratio.More particularly, the sampling high computational ratio of selecting the dqm signal section in a plurality of signal segments of present embodiment foundation is as the gain rate of descent.
With reference to Fig. 2 and Fig. 4, circuit for detecting 240 receives and exchanges radiofrequency signal RF
ACAnd clock PCLK, calculate and exchange radiofrequency signal RF
ACIn the sampling height and the time width of each signal segment, that is to say that circuit for detecting 240 reference clock PCLK are to calculate Z
0To Z
1Between time width T
0And sampling height A
0, can analogize Z
1To Z
2Between time width T
1And sampling height A
1, Z
2To Z
3Between time width T
2And sampling height A
2Deng, can calculate time width T by clock PCLK
0Comprise three clocks (3T cycle), time width T
1Comprise three clocks (3T cycle), time width T
2Comprise two clocks (2T cycle).The signal segment that circuit for detecting 240 is selected to have identical time width is as a signal segment group.For instance, the signal segment of selecting to have the 3T cycle among Fig. 4 is as a signal segment group, and wherein this signal segment group has the sampling height A
0With A
1Deng.Calculate the height A of taking a sample in this signal segment group
0With A
1Mean value, can obtain the average sample height of 3T periodic signal section group.Similar ground, the signal segment group of different time width can calculate corresponding average sample height respectively.Circuit for detecting 240 is organized pairing average sample with different time width signal section and is highly exported to compensating circuit 250.
Compensating circuit 250 is selected the average sample height of at least two different time width signal section groups from the average sample height of the circuit for detecting 240 different time width signal section of exporting, and computing is highly carried out in selected average sample is obtained a ratio.Above-mentioned preset corresponding reference value R also is replaced with the desirable relative ratio under this model frequency domain response in the lump when the part response model of conversion decoding.
The 3rd embodiment is compared to data-restoring device and the method for first embodiment, and its main difference is from a plurality of signal segments, to select the sampling high computational gain rate of descent of dqm signal section.More particularly, in the present embodiment, with reference to Fig. 2, Fig. 3 and Fig. 4, circuit for detecting 240 receives and exchanges radiofrequency signal RF
ACAnd clock PCLK, and calculate interchange radiofrequency signal RF
ACIn the sampling height and the time width of each signal segment.Wherein, Fig. 5 is the process flow diagram according to a kind of data recovery method that the third embodiment of the present invention provided.With reference to Fig. 3 and Fig. 5, in step S340, compensating circuit 250 is selected wherein two signal segments at least from above-mentioned a plurality of signal segments, and according to the sampling high computational ratio of above-mentioned two signal segments.In the present embodiment, step S340 can be divided into substep S541 and substep S542.
In step S541, compensating circuit 250 is selected the sampling height of dqm signal section from a plurality of signal segments.For instance, please with reference to Fig. 4, compensating circuit 250 can be selected zero crossover point Z
0To Z
1Between the sampling height A of signal segment (3T periodic signal section)
0Next, compensating circuit 250 can select to have another signal segment of different time width, for example selects zero crossover point Z
3To Z
4Between the sampling height A of signal segment (4T periodic signal section)
3Therefore, the gain rate of descent is A
0/ A
3
Please with reference to Fig. 5, in step S542, compensating circuit 250 highly carries out computing with two samplings that above-mentioned steps S541 is obtained, and can obtain a ratio (rate of descent promptly gains).Compensating circuit 250 can a more above-mentioned ratio and a corresponding reference value R who presets, and obtains comparative result.At last, compensating circuit 250 is given balanced device 210 according to aforementioned comparative result output compensating signal.
The 4th embodiment is compared to data-restoring device and the method for second embodiment, and its main difference is to select neither the signal segment with the time width, the mode that computing is highly carried out in wherein corresponding average sample.Below cooperate process flow diagram to do detailed explanation.Fig. 6 is the process flow diagram that a kind of data recovery method is provided according to the fourth embodiment of the present invention.With reference to Fig. 2, Fig. 3, Fig. 4 and Fig. 6, in step S340, compensating circuit 250 is selected wherein binary signal section at least from above-mentioned signal segment, and according to the sampling high computational ratio of above-mentioned two signal segments.In present embodiment, step 340 can be divided into substep S641, substep S642 and substep S643.
In step S641, the signal segment that compensating circuit 250 is selected to have identical time width is as a signal segment group.In step S642, calculate the average sample height of each signal segment group according to a plurality of sampling altitude gauges in the signal segment group.In step S643, from a plurality of signal segment groups, select the average sample high computational ratio of dqm signal section group.
Accept above-mentionedly, act Fig. 4 is an example, and the signal segment group in corresponding 3T cycle has the sampling height A
0And sampling height A
1Deng, so compensating circuit 250 calculates both average sample height.The signal segment group in corresponding 2T cycle comprises the sampling height A
2And other sampling of not drawing as yet height etc., so compensating circuit 250 calculates the average sample height of 2T periodic signal section group.Next; Compensating circuit 250 is from above-mentioned a plurality of signal segment group selections two signal segment groups wherein; For example select the signal segment group in corresponding 3T cycle and the signal segment group in corresponding 2T cycle, and according to the two pairing average sample high computational ratio as the gain rate of descent.Then, compensating circuit 250 calculates the operation result of this gain rate of descent ratio and this corresponding reference value R, obtains this compensating signal Sc according to this.
For instance, in the system of HD-DVD, can select its gain rate of descent ratio of average sample high computational in 2T cycle and 4T cycle for use; In the system of DVD, can select its gain rate of descent ratio of average sample high computational in 3T cycle and 6T cycle for use.In addition, compensating circuit 250 is exported the frequency response that compensating signal Sc gives balanced device 210 adjustment radiofrequency signal RF according to this by calculating the difference of above-mentioned ratio with corresponding reference value R.Wherein, corresponding reference value R can set up a parameter on their own by the user, and the frequency response that makes radiofrequency signal is more near the channel characteristic near selected partial response channel.
Can explain by present embodiment,, make radiofrequency signal RF to read, can increase the recognition rate of radiofrequency signal RF at selected partial response channel with selected partial response channel through the frequency response of adjustment radiofrequency signal RF.
What deserves to be mentioned is; Though data-restoring device and method have been depicted a possible kenel in the foregoing description; But having common knowledge the knowledgeable in the affiliated technical field should know; The implementation of the frequency response of adjustment radiofrequency signal RF has a lot, and therefore application of the present invention is when being not restricted to the possible kenel of this kind.Below lift several embodiments again so that this area has the understanding spirit of the present invention that common knowledge the knowledgeable can be further, and embodiment of the present invention.
The 5th embodiment is compared to data-restoring device and the method for first embodiment, and its main difference is to compensate the frequency response of radiofrequency signal RF.More particularly, first embodiment mentions how obtaining compensating signal by radiofrequency signal RF, and in the fifth embodiment of the present invention, a kind of method of using above-mentioned compensating signal compensation radiofrequency signal is described.
Say that at length Fig. 7 is the calcspar according to a kind of data-restoring device of the fifth embodiment of the present invention.With reference to Fig. 7, among present embodiment, data-restoring device 700 comprises balanced device 710, clipper circuit 220, phase-locked loop 230, circuit for detecting 240, compensating circuit 750 and bit stream generator 760.Wherein, the difference with first embodiment is balanced device 710, compensating circuit 750 and bit stream generator 760.At this; Clipper circuit 220 connects balanced device 710, phase-locked loop 230 and circuit for detecting 240; Phase-locked loop 230 connects circuit for detecting 240; Circuit for detecting 240 connects compensating circuit 750, and compensating circuit 750 connects balanced device 710, and bit stream generator 760 connects clipper circuit 220 and phase-locked loop 230.Below will introduce the detailed functions of said elements.
In detail, gain calculating circuit 751 is through calculating the frequency response of frequency and decibel among each signal segment, but calculated gains rate of descent thus.Gain calculating circuit 751 is chosen the sampling height of two signal segments wherein to calculate its ratio, exports this ratio to comparator circuit 752 then.In present embodiment, can be by the preset earlier corresponding reference value R of user.How the size of comparator circuit 752 more above-mentioned ratios and corresponding reference value R compensates this gain rate of descent with decision.Wherein, more above-mentioned ratio is that with the spirit of corresponding reference value R the modified gain rate of descent makes the channel characteristic of its more approaching partial response channel of selecting.
In certain embodiments, comparator circuit 752 comprises a subtracter (not illustrating in the drawings).This subtracter is connected between gain calculating circuit 751 and the balanced device 710.Ratio that this subtracter calculated gains counting circuit 751 is exported and the difference of corresponding reference value R with this difference signal Sc by way of compensation, and are exported to balanced device 710 with this compensating signal Sc.
For instance; The above-mentioned ratio of being exported when gain calculating circuit 751 is not more than corresponding reference value R; Then compensating signal Sc of comparator circuit 752 outputs promotes the gain escalating rate with indication adaptive wave filter 711 in assigned frequency, with adjustment/compensation radiofrequency signal RF.The above-mentioned ratio of being exported when gain calculating circuit 751 is greater than corresponding reference value R, and then compensating signal Sc of comparator circuit 752 outputs reduces the gain escalating rate with indication adaptive wave filter 711 in the assigned frequency compensation, with adjustment/compensation radiofrequency signal RF.
For instance, Fig. 8 is the family curve simulation drawing that compensates the gain escalating rate of radiofrequency signal according to a kind of different compensating parameter K that fifth embodiment of the invention provided in assigned frequency.With reference to Fig. 7 and Fig. 8, among present embodiment, the method for a kind of possible compensation radiofrequency signal RF is provided, this compensation way can use formula (1) to represent, and formula (1) is represented as follows:
Wherein, compensating parameter K is in order to control different gain escalating rates with compensation radiofrequency signal RF.Continuation is with reference to Fig. 7 and Fig. 8, and when above-mentioned ratio is not more than corresponding reference value R, comparator circuit 752 exportable bigger compensating parameter K give adaptive wave filter 711, make adaptive wave filter 711 promote the gain escalating rates.Otherwise, when above-mentioned ratio greater than corresponding reference value R, comparator circuit 752 exportable less compensating parameter K give adaptive wave filter 711, make adaptive wave filter 711 reduce the gain escalating rates, with adjustment radiofrequency signal RF.Select for use different compensating parameter K can make the channel characteristic of the more approaching partial response channel of selecting of frequency response of radiofrequency signal RF, and pass through to reduce and transmit symbol phase mutual interference (Inter Symbol Interference, abbreviation ISI) with the lifting fiduciary level.
Fig. 9 is the regular frequency domain response oscillogram according to a kind of analog channel characteristic partial response that fifth embodiment of the invention provided, and the oversampling rate is 1.25 times.With reference to Fig. 8 and Fig. 9, among present embodiment, belong to PR (1,2 originally; 2,2,1) radiofrequency signal RF; Via selecting for use suitable gain escalating rate can make the corresponding PR of being adjusted to of frequency response (1,2,2 of radiofrequency signal RF; 1), can find on the figure that the two gain rate of descent of 2T periodic signal section and 4T periodic signal section among the radiofrequency signal RF becomes big, makes both relative differents diminish.It should be noted that the different piece response model can correspond to different gain rates of descent.
What deserves to be mentioned is that in another embodiment of the present invention, also can the interchange radiofrequency signal and the clock of the foregoing description be received via bit stream generator 760, the radiofrequency signal that will pass through the adjustment of frequency response is output as bit stream.
In sum; The above embodiments of the present invention provide a kind of data-restoring device and method, wherein through the gain rate of descent of detecting radiofrequency signal, compare channel characteristic of this gain rate of descent and this radiofrequency signal of transmission; The adjustment balanced device is in the gain escalating rate of the required compensation of assigned frequency; To adjust the frequency response of this radiofrequency signal, make this radiofrequency signal to read with selected partial response channel, reduce and transmit the mutual interference of symbol phase; Can increase the recognition rate of this radiofrequency signal at selected partial response channel; And need not select the bigger specific part response channel of similarity degree, thus, can reduce the cost that passage is set and reduce complex circuit design.
What should explain at last is: above embodiment is only in order to technical scheme of the present invention to be described but not limit it; Although the present invention has been carried out detailed explanation with reference to preferred embodiment; Those of ordinary skill in the art is to be understood that: it still can make amendment or be equal to replacement technical scheme of the present invention, also can not make amended technical scheme break away from the spirit and the scope of technical scheme of the present invention and these are revised or be equal to replacement.
Claims (14)
1. data-restoring device comprises:
One balanced device receives a radiofrequency signal and a compensating signal, adjusts said radiofrequency signal according to said compensating signal, exports a balanced radio frequency signal;
One cutting circuit connects said balanced device, receives said balanced radio frequency signal, and said balanced radio frequency signal is cut according to a cleavage is accurate, exchanges radiofrequency signal to export one, and wherein said interchange radiofrequency signal has a plurality of signal segments;
One phase-locked loop connects said clipper circuit, receives and exports a clock according to the phase place of said interchange radiofrequency signal;
One circuit for detecting; Connect said clipper circuit and said phase-locked loop; Receive said interchange radiofrequency signal and said clock, the said clock calculation of foundation is also exported said interchange radiofrequency signal in the time width of said a plurality of signal segments, and the sampling height of detecting and export said a plurality of signal segments; And
One compensating circuit; Connect said circuit for detecting and said balanced device; Sampling high computational one ratio of dqm signal section is selected in output according to said circuit for detecting at least from said a plurality of signal segments; And the corresponding reference value of more said ratio, and export said compensating signal to said balanced device according to comparative result with one.
2. data-restoring device according to claim 1, selected two signal segments of wherein aforementioned said compensating circuit have the different time width.
3. data-restoring device according to claim 1, wherein said balanced device comprise an adaptive wave filter, connect said clipper circuit, receive the frequency response that said compensating signal is adjusted said radiofrequency signal according to this, export said balanced radio frequency signal.
4. data-restoring device according to claim 3, wherein said adaptive wave filter are adjusted the gain escalating rate of said adaptive wave filter in an assigned frequency according to said compensating signal.
5. data-restoring device according to claim 1, wherein said compensating circuit comprises:
One gain calculating circuit is connected to said circuit for detecting, from said a plurality of signal segments, selects the sampling height of dqm signal section and calculates said ratio as a gain rate of descent; And
One comparator circuit connects said gain calculating circuit, receives said ratio, and the relation of more said ratio and said corresponding reference value is exported said compensating signal according to this.
6. data-restoring device according to claim 5; Wherein said comparator circuit comprises a subtracter; It is connected between said gain calculating circuit and the said balanced device; As said compensating signal, and said compensating signal exported to said balanced device in order to a difference of calculating said ratio and said corresponding reference value.
7. data-restoring device according to claim 1, wherein said compensating circuit comprises:
One gain calculating circuit; Be connected to said circuit for detecting; Said a plurality of signal segments are divided into m signal segment group according to time width, and each signal segment group comprises a plurality of signal segments with identical time width, calculates that a plurality of sampling average height produce a mean value of amplitude in above-mentioned each signal segment group; The two calculates said ratio as a gain rate of descent by selecting it in above-mentioned m the pairing m of the signal segment group mean value of amplitude at least, and wherein m is a positive integer; And
One comparator circuit connects said gain calculating circuit, receives said ratio, and the relation of more said ratio and said corresponding reference value is exported said compensating signal according to this.
8. data-restoring device according to claim 1 also comprises a bit stream generator, connects said clipper circuit and said phase-locked loop, with reference to said interchange radiofrequency signal and said clock, exports a bit stream.
9. a data recovery method comprises the following steps:
Adjust a radiofrequency signal according to a compensating signal, obtain a balanced radio frequency signal;
According to the said balanced radio frequency signal of the accurate cutting of a cleavage, exchange radiofrequency signal to obtain one, wherein said interchange radiofrequency signal has a plurality of signal segments;
Phase place according to said interchange radiofrequency signal obtains a clock;
Time width according to the said a plurality of signal segments of said clock calculation;
Detect the sampling height of said interchange radiofrequency signal in said a plurality of signal segments;
From said a plurality of signal segments, select sampling high computational one ratio of dqm signal section at least; And
The corresponding reference value of more said ratio with one, and said compensating signal is provided according to comparative result.
10. data recovery method according to claim 9, selected two signal segments of the step of the said ratio of wherein aforementioned calculating have the different time width.
11. data recovery method according to claim 9; Wherein adjust said radiofrequency signal according to said compensating signal; The step that obtains said balanced radio frequency signal comprises the frequency response of adjusting said radiofrequency signal according to said compensating signal, obtains said balanced radio frequency signal.
12. data recovery method according to claim 11, the step of wherein adjusting the frequency response of said radiofrequency signal comprise according to said compensating signal, compensate the gain escalating rate of the frequency response of said radiofrequency signal in an assigned frequency.
13. data recovery method according to claim 9; Wherein according to said ratio; The relation of more said ratio and said corresponding reference value, the step that obtains said compensating signal according to this comprise that a difference of calculating said ratio and said corresponding reference value is as said compensating signal.
14. data recovery method according to claim 9, the step of wherein from said a plurality of signal segments, selecting the said ratio of sampling high computational of dqm signal section at least comprises:
According to time width said a plurality of signal segments are divided into m signal segment group, each signal segment group comprises k signal segment with identical time width;
Calculate in the sampling average height of k signal segment described in the same signal segment group and produce average sample height; And
By in above-mentioned m the pairing m of the signal segment group average sample height at least the two, calculate aforementioned two average samples and highly obtain said ratio, wherein m and k are positive integer.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6542039B1 (en) * | 1999-03-29 | 2003-04-01 | Matsushita Electric Industrial Co., Ltd. | Phase-locked loop apparatus and method |
| JP2004234738A (en) * | 2003-01-29 | 2004-08-19 | Sony Corp | Reproduced signal waveform processing device |
| CN101083104A (en) * | 2006-05-31 | 2007-12-05 | 其乐达科技股份有限公司 | Data recovery system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6542039B1 (en) * | 1999-03-29 | 2003-04-01 | Matsushita Electric Industrial Co., Ltd. | Phase-locked loop apparatus and method |
| JP2004234738A (en) * | 2003-01-29 | 2004-08-19 | Sony Corp | Reproduced signal waveform processing device |
| CN101083104A (en) * | 2006-05-31 | 2007-12-05 | 其乐达科技股份有限公司 | Data recovery system and method |
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