CN1130846C - Waveform equalization apparatus - Google Patents
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- CN1130846C CN1130846C CN 97121621 CN97121621A CN1130846C CN 1130846 C CN1130846 C CN 1130846C CN 97121621 CN97121621 CN 97121621 CN 97121621 A CN97121621 A CN 97121621A CN 1130846 C CN1130846 C CN 1130846C
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Abstract
A waveform equalization apparatus equalizes a digital information signal reproduced from a recording medium by multiplying the reproduced digital information signal and delayed signals thereof by tap coefficients, wherein each of the tap coefficients is adaptively controlled. An output signal of a transversal filter for each of a plural number of symbol data included in a digital information signal reproduced from a target track is compared with predetermined thresholds to obtain a plausible digital information signal. An amplitude difference between the output signal and the plausible digital information signal is calculated. Thereafter, the tap coefficients of each symbol data and the output signals of the plural number of symbol data are analyzed to provide a coefficient value status signal indicating whether the tap coefficients are converged or diverged and a data analysis result signal representing whether an eye pattern of the output signals is open or closed. Based on the coefficient value status signal and the data analysis result signal, predetermined initial tap coefficients, or new tap coefficients is selectively providing as the tap coefficients, wherein the new tap coefficients are obtained by using the amplitude difference, the reproduced digital information signal and the delayed signals thereof.
Description
Technical field
The present invention relates to a kind of Waveform equalization apparatus, particularly relate to a kind of improved Waveform equalization apparatus, this equipment can will be used for the optimum value of the tap coefficient convergence of balanced regenerating information signal to them.
Background technology
The traditional transversal filter that uses as waveform equalizer is the tap coefficient of control lag element automatically, and this delay element has between the tap identical with the signal period and postpones.Because filter is type aperiodic, it is stable basically.
In the magnetic recording and reclaim equiment that use partial response method record and reproducing digital information signal, used waveform equalizer, this equalizer uses transversal filter.In this filter, according to the output of filter and the difference between its estimated value, the digital information signal of regeneration is carried out the self adaptation adjustment so that suppress intersymbol interference in the reproducing digital information signal, and wherein estimated value is by this output transform being become one of predetermined ternary (ternary) value obtain.The output of filter is provided for symbol decoder, and for example Viterbi (Viterbi) decoder reaches error correction device, for example RS (Reed Solomon) decoder.
Fig. 1 shows the regenerative circuit 100 of above-mentioned traditional magnetic recording and reclaim equiment.Particularly, use is installed in the magnetic head H scanning tape T on the going barrel and the regenerating information signal that obtains, is amplified to a predetermined level, afterwards, the noise contribution that comprises in the information signal that is exaggerated is removed by filter 20 with prime amplifier (PA) 10.Then the information signal of filtering simulated-digital quantizer (ADC) 30 converts digital information signal to.In direct current (DC) controller 40, regulate digital information signal to send a DC level, as the reproducing digital information signal of delivering to waveform equalizer 50.As shown in fig. 1, waveform equalizer 50 comprises four delay circuit 51-54, five multiplier 55-59, an add circuit 60, coefficient update circuit 70, level detector 80 and subtracter 90.
Delay circuit 51-54 is by they each, sequentially postpones the amount of being scheduled to being added to reproducing digital information signal on it.To be somebody's turn to do then from the reproducing digital information signal of DC controller 40 and the digital information signal of each delay and offer each corresponding multiplier 55-59, to be added to therein on each corresponding multiplier each signal with from following respective taps multiplication with coefficient update circuit 70 outputs described, thereby obtain output from multiplier 55-59 through the tap coefficient weighting.Next, add circuit 60 adds the output of multiplier 55-59 together and itself and number is offered symbol decoder and error correction device (not shown) as balanced output signal, level detector 80 and subtracter 90.Level detector 80 compares balanced output signal and predetermined threshold value, with the level of detection balanced output signal, and will detect level and deliver to subtracter 90.
In subtracter 90, by calculating detection level from level detector 80, it is desired value, and the difference between the balanced output signal of add circuit 60, obtain the amplitude error of balanced output signal with respect to the balanced output signal desired value, wherein desired value is a ternary value-1,0 for example, in 1 one.Then, this amplitude error is fed back to coefficient update circuit 70, this circuit 70 is exported tap coefficient by the output of amplitude error be multiply by reproducing digital information signal and delay circuit 51-55.Multiply by tap coefficient by inhibit signal, suppressed the intersymbol interference that wherein comprises, thereby can finish the wave shape equalization of reproducing digital information signal reproducing digital information signal and it.
Yet, in traditional waveform equalizer, when the reproducing digital information signal that damages serious distortion because of tape is provided for equalizer, the situation that tap coefficient is dispersed may appear.In case tap coefficient is dispersed,, in waveform equalizer, can not carry out further coefficient updating operation although recovered to be added to regular regeneration digital information signal on it.Thereby need take measures, when dispersing, immediately tap coefficient is updated to their optimum value with convenient tap coefficient.
Summary of the invention
Therefore, main purpose of the present invention provides a kind of improved Waveform equalization apparatus, and this equipment can be by using active data and coefficient value analytical technology, with the optimum value of tap coefficient convergence to them.
According to an aspect of the present invention, one Waveform equalization apparatus is provided, this equipment adopts transversal filter, be used for by the weighted value addition, suppress the intersymbol interference of digital information signal, this digital information signal is to utilize magnetic head to regenerate from the recording medium with many tracks, this weighted value obtains by reproducing digital information signal and its inhibit signal be multiply by tap coefficient, wherein each tap coefficient is in check, and reproducing digital information signal comprises several symbol datas, and this equipment comprises:
Level detector is used for each for a plurality of symbol datas, and the output signal and the predetermined threshold of transversal filter compared, and to obtain the likelihood digital information signal, wherein a plurality of symbol datas are included in from the digital information signal of target track regeneration;
Subtracter is used to calculate amplitude difference between output signal and the likelihood digital information signal;
The coefficient value analyzer is used to analyze the tap coefficient of each symbol data, thereby the coefficient value status signal of one first logical value or second logical value is provided, and this signal indication whether all restrain or disperse by all coefficient values;
Data-analyzing machine, be used for each output signal and the predetermined threshold of a plurality of symbol datas are compared, thereby and determine whether the eye pattern of output signal opens or the closed data analysis consequential signal that generates one first logical value or second logical value according to comparative result;
Setup Controller responds any in the data analysis consequential signal of the coefficient value status signal of first logical value and first logical value, generates the device control signal of one first logical value; Respond the data analysis consequential signal of the coefficient value status signal of second logical value and second logical value after this, generate the device control signal of one second logical value;
Storage device is used for storage device control signal and predetermined original tap coefficient;
Select circuit, be used for providing predetermined original tap coefficient or new tap coefficient selectively, with as tap coefficient by using this amplitude difference, reproducing digital information signal and inhibit signal thereof to obtain according to the device control signal.
According to a further aspect in the invention, provide a kind of device of the information signal that writes down of being used to regenerate on recording medium, this device comprises:
Filter is used for use is installed in the scan recording media on the drum and the information signal of regenerating carries out filtering, removes with the noise contribution that will comprise in the regenerating information signal;
Analog-digital converter, be used for this information signal of filtering convert digital information signal to; And
Waveform equalizing device, this device adopts transversal filter, be used for by weighted value phase Calais being suppressed the intersymbol interference of regenerating information signal, this weighted value obtains by information transmitted signal and its inhibit signal be multiply by tap coefficient, each tap coefficient is in check, and reproducing digital information signal comprises several symbol datas, and wherein Waveform equalizing device comprises:
Level detector is used for each for a plurality of symbol datas, and the output signal and the predetermined threshold of transversal filter compared, and to obtain the likelihood digital information signal, wherein symbol data is included in from the digital information signal of target track regeneration;
Subtracter is used to calculate amplitude difference between output signal and the likelihood digital information signal;
The coefficient value analyzer is used to analyze the tap coefficient of each symbol data, thereby the coefficient value status signal of one first logical value or second logical value is provided, and this signal indication whether all restrain or disperse by all coefficient values;
Data-analyzing machine, be used for each output signal and the predetermined threshold of a plurality of symbol datas are compared, thereby and determine whether the eye pattern of output signal opens or the closed data analysis consequential signal that generates one first logical value or second logical value according to comparative result;
Setup Controller responds any in the data analysis consequential signal of the coefficient value status signal of first logical value and first logical value, generates the device control signal of one first logical value; Respond the data analysis consequential signal of the coefficient value status signal of second logical value and second logical value after this, generate the device control signal of one second logical value;
Storage device is used for storage device control signal and predetermined original tap coefficient;
Select circuit, be used for providing predetermined original tap coefficient selectively, or new tap coefficient, with as tap coefficient by using this amplitude difference, reproducing digital information signal and inhibit signal thereof to obtain according to the device control signal.
Description of drawings
Above-mentioned and other purpose of the present invention and feature will show from the description of preferred embodiments that provides below in conjunction with accompanying drawing, wherein:
Fig. 1 is the block diagram with regenerative circuit of traditional waveform equalizer;
Fig. 2 illustrates the regenerative circuit block diagram that is equipped with according to Waveform equalization apparatus of the present invention;
Fig. 3 illustrates the data that comprise in the Waveform equalization apparatus shown in Fig. 2 and the block diagram of coefficient value analytical equipment;
Fig. 4 illustrates the more detailed block diagram of the analyzer of coefficient value shown in Fig. 3;
Fig. 5 provides the more detailed block diagram of data-analyzing machine shown in Fig. 3; And
Fig. 6 illustrates the figure that is used to illustrate the data analysis scheme that adopts according to data-analyzing machine of the present invention.
Embodiment
Referring to Fig. 2, the figure shows the block diagram of regenerative circuit 200, this regenerative circuit 200 has according to Waveform equalization apparatus 250 of the present invention.Regenerative circuit 200 comprises PA210, filter 220, ADC230, DC controller 240 and Waveform equalization apparatus 250.As shown in Figure 2, Waveform equalization apparatus 250 comprises four delay circuit 251-254, five multiplier 255-259, an add circuit 260, coefficient update circuit 270, level detector 280, subtracter 290 and data and coefficient value analytical equipment 300.Although four delay circuits and five multipliers are arranged, should notice that their concrete quantity can change according to the tap number of the transversal filter that uses as Waveform equalization apparatus for what illustrate for purpose of brevity.As finding out from above, creative regenerative circuit 200 constitutes in the disclosed conventional regeneration circuit in background of invention above data and coefficient value analytical equipment 300 are inserted into.
Particularly, at first will have a plurality of information signals that are recorded in the symbol data on the tape T, by born again with being installed in magnetic head H scanning tape T on the going barrel (not shown), connect the mode of a symbol then according to a symbol, through finish with Fig. 1 in the PA210 of appropriate section said function, filter 220, ADC 230 and DC controller 240 offer delay circuit 251-254 with this information signal, multiplier 255 and coefficient update circuit 270.Delay circuit 251-254 will be added to reproducing digital information signal on it and sequentially postpone the amount of being scheduled to, and provide the digital information signal of delay to give corresponding multiplier 256-259.At multiplier 255-259, to multiply by corresponding tap coefficient from the reproducing digital information signal of DC controller 240 with from the delay digital information signal of delay circuit 251-254, thereby obtain signal through the tap coefficient weighting from coefficient update circuit 270.Next, will offer add circuit 260 from the multiplied result of multiplier 255-259, this add circuit is added together with them.Be subjected under the anti-situation about suppressing of intersymbol interference in the original digital information signal waveform, the intersymbol interference composition that suppresses destroyed waveform by wave shape equalization, this wave shape equalization is that the weighting multiplied result addition that will obtain according to tap coefficient realizes that wherein tap coefficient is from coefficient update circuit 270.
Afterwards, will offer symbol decoder as balanced output signal from the output of add circuit 260, error correction device (not shown), level detector 280, subtracter 290, data and coefficient value analytical equipment 300.Level detector 280 determines to be added to the desired value of the balanced output signal on it by balanced output signal and prearranged signal level are compared, and this desired value is for example ternary value-1,0, in 1 one.Then, determine that the result is sent to subtracter 290, amplitude difference or error that this subtracter 290 calculates between balanced output signal and the desired value, wherein amplitude error is provided for data and coefficient value analytical equipment 300 and coefficient update circuit 270.
At data and coefficient value analytical equipment 300, new types of data of the application of the invention and coefficient value analytical plan, analyze to the balanced output signal that provides from add circuit 260 with at the tap coefficient that coefficient update circuit 270 sends, will be illustrated this with reference to figure 3-6 hereinafter.According to analysis result, amplitude error or predetermined original tap coefficient from subtracter 290 are provided for selectively coefficient update circuit 270 from data and coefficient value analytical equipment 300.
See Fig. 3 now, wherein show the functional-block diagram of data shown in Fig. 2 and coefficient value analytical equipment 300.As shown in Figure 3, data and coefficient value analytical equipment 300 comprise coefficient value analyzer 310, data-analyzing machine 320, Setup Controller 330, storage device 340 and selection circuit 350.Coefficient value analyzer 310 is analyzed each tap coefficient from the circuit of coefficient update shown in Fig. 2 270 to determine whether that all tap coefficients are all between predetermined minimum and maximum threshold value.Hereinafter will provide the details of coefficient value analyzer 310 with reference to figure 4.
In Fig. 4, coefficient value analyzer 310 comprises five comparator 311-315, memory 316 and with door 317.The tap coefficient from coefficient update circuit 270 that each of comparator 311-315 will be added on it compares with being stored in minimum and maximum threshold value predetermined in the memory 316, to determine whether tap coefficient drops between the predetermined minimum and maximum threshold value.
For example, if tap coefficient drops between the predetermined minimum and maximum threshold value, described each comparator sends logic low; And if not so, it produces logic high.Logic high that sends at comparator 311-315 and low level are sent to and door 317 then, therein with logic level logically in conjunction with to produce a binding signal, with this coefficient value status signal as expression tap coefficient state.That is, according to the present invention, if with all input signals of door 317 be logic high, mean that tap coefficient disperses, then produce the coefficient value status signal of logic highs with door 317; And if other situation is a logic low if promptly with door 317 any one input signal is arranged, the expression tap coefficient is restrained, and then it produces the coefficient value status signal of logic low.Next logic high or low level coefficient value status signal are provided for data-analyzing machine shown in Fig. 3 320 and Setup Controller 330.
Referring again to Fig. 3, according to from the coefficient value status signal of the logic high of door 317, Setup Controller 330 produces the device control signal with logic-high value, no matter what the signal from data-analyzing machine 320 is.And according to from the coefficient value status signal of the logic low value of door 317, Setup Controller 330 is by considering the data analysis consequential signal from data-analyzing machine 320, produce logic high or low level device control signal, hereinafter will illustrate fully this with reference to figure 5 and 6, wherein as will be described further, the data analysis consequential signal represents whether the eye pattern from the balanced output signal of add circuit shown in Fig. 2 260 is open or closed.
With reference to Fig. 5 and 6, data-analyzing machine 320 comprises three comparators 322,323 and 332, three counter 327-329, subtracter 331, memory 333 and adder 335.Comparator 322 will be from the balanced output signal of add circuit shown in Fig. 2 260 and each of two predetermined thresholds, and for example a shown in Fig. 6 and d compare.Comparator 323 is with each of balanced output signal and two other predetermined threshold, and for example b shown in Fig. 6 and c compare.These four predetermined thresholds are by in advance according to each symbol data figure place decision of input information signal; And be stored in the memory 333.In other words, as can be as seen from Figure 6, when each symbol data figure place is 8, make symbol data on from-128 to+128 scope, then respectively by with a determined value and-128 additions with deduct same value with+128 and obtain preceding two predetermined threshold a and d, and latter two predetermined threshold b and c are respectively by deducting a determined value and same value and 0 addition are obtained with 0.Four predetermined thresholds satisfy relational expression a＜b＜c＜d, the identical and symbol difference of a and d size wherein, and b also is identical and the symbol difference with the c size.
For example, at comparator 322, if balanced output signal belongs to the regional A of Fig. 6, be balanced output signal greater than-128 and be equal to or less than the first predetermined threshold a the preceding, or in the area E of Fig. 6, be balanced output signal less than+128 and be equal to or greater than the second predetermined threshold d the preceding, then comparator 322 sends first comparison signal of logic high; If not so, it sends first comparison signal of logic low.Similarly, at comparator 323, if balanced output signal belongs to the zone C of Fig. 6, promptly balanced output signal is in latter two predetermined threshold b and c scope, and then comparator 323 sends second comparison signal of logic high; If not so, it sends second comparison signal of logic low.Although for proving absolutely for purpose of brevity, must notice that four predetermined thresholds and five zones are according to partial response level-IV decision.
First comparison signal is offered counter 327, reverser 324 and with door 326, and second comparison signal be sent to two with the door 325 and 326.More specifically, reverser 324 with first comparison signal oppositely to give first to provide the first reverse comparison signal with door 325.First will logically combine from two input signals that reverser 324 and comparator 323 provide then, to send first and binding signal to counter 328 with door 325.And second will combine from the signal logic of comparator 322 and 323 ground with door 326, to export second and binding signals to counter 329.In one embodiment of the present invention, have reverser 324 and first and door 325 so that provide first and binding signal, be used for calculating the input information number of signals of each symbol data that is arranged in Fig. 6 area B and D, and install second with door 326 to send second and binding signal, be used for calculating the input information number of signals of each symbol data that is arranged in Fig. 6 zone C.
As shown in Figure 5, the input of counter 327 is first comparison signals from comparator 322; The input of counter 328 be from first with door 325 first and binding signal; And the input of counter 329 be from second with door 326 second and binding signal.When the input of counter 327 was first comparison signal of logic high, it counted to this signal.And when the input of counter 328 was first and binding signal of logic high, it counted to this signal; Equally, when the input of counter 329 was second and binding signal of logic high, it counted to this signal.Next symbol data is repeated these compare and the numeration operation, till the symbol data of all digital information signals of reading from the target track of tape is all processed.
Counter value at counter 327-329 place is provided for adder 335, and the counter value that the expression at counter 328 places simultaneously belongs to the symbol data number of area B and D is provided for subtracter 331.Adder 335 will be added together from the counter value of counter 327-329, provide a total counter value to give subtracter 331.
At subtracter 331, obtain difference by using total counter value from adder 335 that the counter value that provides from counter 328 is provided; Then this difference is offered comparator 332.Comparator 332 will compare so that compare result signal to be provided with the predetermined threshold that is stored in the memory 333 from the difference of subtracter 331.That is, if from the difference of subtracter 331 greater than predetermined threshold, this means that the eye pattern of the balanced output signal of a plurality of symbol datas of reading from target track is open, then the compare result signal of comparator 332 output logic low values; And if difference is equal to or less than predetermined threshold, the eye pattern of expression balanced output signal is closed, and then comparator 332 produces the compare result signal of logic-high value.Then the compare result signal of logic low or high value is offered as shown in Figure 3 Setup Controller 330 as the data analysis consequential signal.
Referring again to Fig. 3, Setup Controller 330 is according to from the coefficient value status signal of coefficient value analyzer 310 with from the data analysis consequential signal generation device control signal of data-analyzing machine 320.That is, according to the data analysis consequential signal of the coefficient value status signal of logic high and logic high any, Setup Controller 330 produces the device control signal of logic highs; And according to the coefficient value status signal of logic low and the data analysis consequential signal of logic low after this, Setup Controller 330 produces the device control signal of logic low.Logic high or low level device control signal are sent to storage device 340 then, select the coefficient update circuit 270 shown in circuit 350 and Fig. 2.
Select circuit 350,, export tap coefficient selectively from coefficient update circuit 270 according to device control signal from Setup Controller 330, or the predetermined original tap coefficient that recovers from storage device 340.In other words, according to the device control signal of logic high, tap coefficient is sent back to the circuit of coefficient update shown in Fig. 2 270; And, be provided for coefficient update circuit 270 from the original tap coefficient of storage device according to the device control signal of logic low.
Referring again to Fig. 2, to compare with the traditional coefficient update circuit shown in Fig. 1, the coefficient update circuit 270 with improvement project can obtain effectively in order to deliver to the tap coefficient of corresponding multiplier 255-259.That is, according to the logic low device control signal from Setup Controller shown in Fig. 3 330, coefficient update circuit 270 will be transmitted to corresponding multiplier 255-259 from the tap coefficient of selecting circuit 350 to provide, not make any change.And according to the logic high device control signal from Setup Controller 330, coefficient update circuit 270 provides new tap coefficient for multiplier 255-259, these coefficients are by using from the predetermined original tap coefficient of selecting circuit 350, obtain from the amplitude difference of level detector 290 with from the inhibit signal of delay circuit 251-254.
More specifically, according to the device control signal of logic high, from the predetermined original tap coefficient of coefficient update circuit 270 outputs.After this, according to the device control signal of logic low, initial, obtain tap coefficient by multiplying each other with amplitude difference and inhibit signal, with this tap coefficient with postponed the predetermined original tap coefficient addition of scheduled volume at the delay circuit (not shown), obtain new tap coefficient.From this time, with such tap coefficient, the last new tap coefficient addition and the tap coefficient that obtains upgrades new tap coefficient of the tap coefficient after being about to multiply each other with it.To offer corresponding multiplier 255-259 from the tap coefficient of coefficient update circuit 270 outputs, thereby output has suppressed the balanced output signal of intersymbol interference.The result is that by using by using the tap coefficient that data of the present invention and coefficient value analytical technology obtain, the present invention can balanced effectively regenerating information signal.
Although the present invention illustrates and describes according to specific embodiment, obviously can make many variants and modifications to it to those skilled in the art, and not break away from the spirit and scope of the invention that limit as claims.
Claims (11)
1. Waveform equalization apparatus, this equipment adopts transversal filter, be used for by weighted value phase Calais being suppressed the intersymbol interference of digital information signal, this digital information signal is to utilize magnetic head to regenerate from the recording medium with many tracks, this weighted value obtains by reproducing digital information signal and its inhibit signal be multiply by tap coefficient, wherein each tap coefficient is in check, and reproducing digital information signal comprises a plurality of symbol datas, and this equipment comprises:
Level detector (280), be used for each for a plurality of symbol datas, the output signal and the predetermined threshold of transversal filter are compared, and to obtain the likelihood digital information signal, wherein a plurality of symbol datas are included in from the digital information signal of target track regeneration;
Subtracter (290) is used to calculate amplitude difference between output signal and the likelihood digital information signal;
Coefficient value analyzer (310) is used to analyze the tap coefficient of each symbol data, thereby the coefficient value status signal of one first logical value or second logical value is provided, and this signal indication whether all restrain or disperse by all coefficient values;
Data-analyzing machine (320), be used for each output signal and the predetermined threshold of a plurality of symbol datas are compared, thereby and determine whether the eye pattern of output signal opens or the closed data analysis consequential signal that generates one first logical value or second logical value according to comparative result;
Setup Controller (330) responds any in the data analysis consequential signal of the coefficient value status signal of first logical value and first logical value, generates the device control signal of one first logical value; Respond the data analysis consequential signal of the coefficient value status signal of second logical value and second logical value after this, generate the device control signal of one second logical value;
Storage device (340) is used for storage device control signal and predetermined original tap coefficient;
Select circuit (350), be used for providing predetermined original tap coefficient or new tap coefficient selectively, with as tap coefficient by using this amplitude difference, reproducing digital information signal and inhibit signal thereof to obtain according to the device control signal.
2. equipment as claimed in claim 1, wherein coefficient value analyzer (310) comprising:
A plurality of comparators (311)-(315), be used for each tap coefficient and predetermined minimum and maximum threshold value are compared, so that the compare result signal of first or second logic level to be provided, this compare result signal represents whether described each tap coefficient drops within the predetermined minimum and maximum threshold value; And
With door (317), be used for logically combination of compare result signal, so that the binding signal of first or second logic level is exported as the coefficient value status signal.
3. equipment as claimed in claim 2 is wherein selected circuit (350), according to the device control signal of first logic level, and the output tap coefficient; And according to the device control signal of second logic level, the predetermined original tap coefficient of output or by with this difference of vibration new tap coefficient that obtains with reproducing digital information signal and inhibit signal thereof on duty selectively.
4. equipment as claimed in claim 2, wherein the predetermined threshold that uses in data-analyzing machine (320) is to determine according to each symbol data figure place of reproducing digital information signal, and predetermined threshold number depends on the type of partial response level.
5. equipment as claimed in claim 4, the type of wherein partial response level is IV.
6. equipment as claimed in claim 5, wherein each symbol data figure place is 8, the scope of described each symbol data-128 and+128 between.
7. equipment as claimed in claim 6, wherein predetermined threshold number is 4, a, b, c and d satisfy relational expression a＜b＜c＜d, and wherein a is big or small each other identical with d, the symbol difference; And b is different with the big or small each other same-sign of c.
8. equipment as claimed in claim 7, wherein form five zones according to four predetermined thresholds, one of them area E+128 and predetermined threshold d between, regional A-128 and predetermined threshold a between, a zone C between predetermined threshold b and c, region D between predetermined threshold d and the c and an area B between predetermined threshold b and a.
9. equipment as claimed in claim 8, wherein data-analyzing machine (320) comprising:
Comparator (322) is used for each output signal and two predetermined threshold a and d are compared;
Comparator (323) is used for each output signal and two predetermined threshold b and c are compared;
Counter (327) is used for the comparative result according to comparator (322), and counting drops on the number of the output signal among regional A and the E;
Counter (328) is used for the comparative result according to comparator (322) and comparator (323), and counting drops on the number of the output signal among area B and the D;
Counter (329) is used for the comparative result according to comparator (322) and comparator (323), and counting drops on the number of the output signal in the zone C;
Adder (335), be used for the number in each of five zones at register (327)-(329) countings added together, with the device of output total count value;
Subtracter (331) is used for deducting the counter value that counter (328) provides from total counter value and obtains difference; And
Comparator (332) is used for this difference and predetermined value are compared, and determines according to comparative result whether the eye pattern of output signal opens or closure, to produce the data analysis consequential signal of first or second logical value.
10. equipment as claimed in claim 9, wherein data-analyzing machine (320) also comprises the memory (333) that is used to store four predetermined thresholds and predetermined value.
11. the equipment of the information signal that writes down on recording medium of being used to regenerate, this equipment comprises:
Filter (220) is used for use is installed in the scan recording media on the drum and the information signal of regenerating carries out filtering, removes with the noise contribution that will comprise in the regenerating information signal;
Analog-digital converter (230), be used for this information signal of filtering convert digital information signal to; And
Waveform equalizing device (250), this device adopts transversal filter, be used for by weighted value phase Calais being suppressed the intersymbol interference of regenerating information signal, this weighted value obtains by information transmitted signal and its inhibit signal be multiply by tap coefficient, each tap coefficient is in check, and reproducing digital information signal comprises several symbol datas, and wherein Waveform equalizing device comprises:
Level detector (280), be used for each for a plurality of symbol datas, the output signal and the predetermined threshold of transversal filter are compared, and to obtain the likelihood digital information signal, wherein symbol data is included in from the digital information signal of target track regeneration;
Subtracter (290) is used to calculate amplitude difference between output signal and the likelihood digital information signal;
Coefficient value analyzer (310) is used to analyze the tap coefficient of each symbol data, thereby the coefficient value status signal of one first logical value or second logical value is provided, and this signal indication whether all restrain or disperse by all coefficient values;
Data-analyzing machine (320), be used for each output signal and the predetermined threshold of a plurality of symbol datas are compared, thereby and determine whether the eye pattern of output signal opens or the closed data analysis consequential signal that generates one first logical value or second logical value according to comparative result;
Setup Controller (330) responds any in the data analysis consequential signal of the coefficient value status signal of first logical value and first logical value, generates the device control signal of one first logical value; Respond the data analysis consequential signal of the coefficient value status signal of second logical value and second logical value after this, generate the device control signal of one second logical value;
Storage device (340) is used for storage device control signal and predetermined original tap coefficient;
Select circuit (350), be used for providing predetermined original tap coefficient selectively, or new tap coefficient, with as tap coefficient by using this amplitude difference, reproducing digital information signal and inhibit signal thereof to obtain according to the device control signal.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR76493/96 | 1996-12-30 | ||
| KR76493/1996 | 1996-12-30 | ||
| KR1019960076493A KR0184401B1 (en) | 1996-12-30 | 1996-12-30 | Adapting type equalizer |
| KR76494/96 | 1996-12-30 | ||
| KR76494/1996 | 1996-12-30 | ||
| KR1019960076496A KR0184400B1 (en) | 1996-12-30 | 1996-12-30 | Adapting type equalizer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1187074A CN1187074A (en) | 1998-07-08 |
| CN1130846C true CN1130846C (en) | 2003-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97121621 Expired - Fee Related CN1130846C (en) | 1996-12-30 | 1997-11-10 | Waveform equalization apparatus |
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| Country | Link |
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| CN (1) | CN1130846C (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113783811A (en) * | 2020-06-10 | 2021-12-10 | 英业达科技有限公司 | Method and device for calculating joint coefficient |
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- 1997-11-10 CN CN 97121621 patent/CN1130846C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1187074A (en) | 1998-07-08 |
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