CN1187074A - Waveform equalization apparatus - Google Patents
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- CN1187074A CN1187074A CN97121621A CN97121621A CN1187074A CN 1187074 A CN1187074 A CN 1187074A CN 97121621 A CN97121621 A CN 97121621A CN 97121621 A CN97121621 A CN 97121621A CN 1187074 A CN1187074 A CN 1187074A
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Abstract
A waveform balancing equipment balances the regenerated digital signal by multiplying the regenerated digital signal and the delay thereof and the tap coefficient. For all symbolic data, the likelihood digital signal is obtained by comparing the output signal of a horizontal filter with a preset threshold. The amplitude difference between the output signal and the likelihood digital signal is calculated. The tap coefficient and the output signal of all symbolic data are analyzed to provide the analysis results which show the state signal of the coefficient value of convergence or divergence of the tap coefficient, and the data of the open or closed eye diagram of the output signal. In this way, the new tap coefficient is obtained by selectively providing the preset original tap coefficient or using the amplitude difference, regenerated digital signal and the delay thereof.
Description
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.
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.
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:
For each of a plurality of symbol datas, the output signal and the predetermined threshold of transversal filter compared, to obtain the device of likelihood (plausible) digital information signal, wherein symbol data is included in from the digital information signal of target track regeneration;
Calculate the device of amplitude difference between output signal and the likelihood digital information signal;
Analytical equipment, be used to analyze the output signal of tap coefficient and a plurality of symbol datas of each symbol data, thereby provide the eye pattern (eye pattern) of expression coefficient value status signal whether all tap coefficients are all restrained or dispersed and expression output signal whether to open or closed data analysis consequential signal; And
Select and coefficient updating device, be used for according to coefficient value status signal and data analysis consequential signal, provide predetermined original tap coefficient selectively, or new tap coefficient by using this amplitude difference, reproducing digital information signal and inhibit signal thereof to obtain, with this as tap coefficient.
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:
Use is installed in the head scanning recording medium on the drum and the information signal of regenerating carries out filtering, removes with the noise contribution that will in the regenerating information signal, comprise, and with this information signal of filtering convert the device of 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, described weighted value obtains by transmit information signals 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:
For a plurality of symbol datas each, transversal filter output signal and predetermined threshold are compared, to obtain the device of likelihood digital information signal, wherein symbol data is included in from the digital information signal of target track regeneration;
Calculate the device of amplitude difference between output signal and this likelihood digital information signal;
Analytical equipment, be used to analyze the output signal of tap coefficient and a plurality of symbol datas of each symbol data, thereby provide the eye pattern of expression coefficient value status signal whether all tap coefficients are all restrained or dispersed and expression output signal whether to open or closed data analysis consequential signal; And
Select and coefficient updating device, be used for according to this coefficient value status signal and data analysis consequential signal, provide predetermined original tap coefficient selectively, or new tap coefficient by using this amplitude difference, reproducing digital information signal and inhibit signal thereof to obtain, with this as tap coefficient.
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.
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 PA 210, filter 220, and ADC 230, DC controller 240 and Waveform equalization apparatus 250.As shown in Figure 2, Waveform equalization apparatus 250 comprises four delay circuit 25 1-254, 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 PA 210 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 (12)
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:
Be used for each for a plurality of symbol datas, the output signal and the predetermined threshold of transversal filter compared, to obtain the device of likelihood digital information signal, wherein a plurality of symbol datas are included in from the digital information signal of target track regeneration;
Be used to calculate the device of amplitude difference between output signal and the likelihood digital information signal;
Analytical equipment, be used to analyze the output signal of tap coefficient and a plurality of symbol datas of each symbol data, thereby provide the eye pattern of expression coefficient value status signal whether all tap coefficients are all restrained or dispersed and expression output signal whether to open or closed data analysis consequential signal; And
Select and coefficient updating device, be used for according to coefficient value status signal and data analysis consequential signal, provide predetermined original tap coefficient selectively, or new tap coefficient by using this amplitude difference, reproducing digital information signal and inhibit signal thereof to obtain, with this as tap coefficient.
2. equipment as claimed in claim 1, wherein analytical equipment comprises:
Be used for each tap coefficient and predetermined minimum and maximum threshold value are compared, with the device of compare result signal that first or second logic level is provided, this compare result signal represents whether described each tap coefficient drops within the predetermined minimum and maximum threshold value;
Coupling apparatus is 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; And
Compare and definite device, be used for for a plurality of symbol datas, to compare from each output signal and the predetermined threshold of transversal filter output, and determine according to comparative result whether its eye pattern opens or closure, thereby produce the data analysis consequential signal of first or second logical value.
3. equipment as claimed in claim 2, wherein selection and coefficient updating device comprise:
Be used for coefficient value status signal, the device of the tap coefficient that output and data analysis consequential signal are irrelevant according to second logic level; And
Be used for data analysis consequential signal according to the coefficient value status signal of first logic level and second logic level after this, the predetermined original tap coefficient of output selectively, or by with this difference of vibration new tap coefficient that obtains with reproducing digital information signal and its inhibit signal on duty.
4. equipment as claimed in claim 2, if wherein all compare result signal level are second logic level, then the coefficient value status signal has second logic level; And if other situation is first logic level;
5. equipment as claimed in claim 2 be to determine according to each symbol data figure place of reproducing digital information signal at the predetermined threshold that compares and definite device uses wherein, and predetermined threshold number depends on the type of partial response level.
6. equipment as claimed in claim 5, the type of wherein partial response level is IV.
7. equipment as claimed in claim 6, wherein each symbol data figure place is 8, the scope of described each symbol data-128 and+128 between.
8. equipment as claimed in claim 7, 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.
9. equipment as claimed in claim 8 wherein forms five zones according to four predetermined thresholds, wherein upper area+128 and predetermined threshold d between, bottom section-128 and predetermined threshold a between, middle section is between predetermined threshold b and c.
10. equipment as claimed in claim 9, wherein relatively and definite device comprise:
Comparison and counting device are used for each output signal and four predetermined threshold a, and b, c and d compare with counting and drop on output signal number in each zone; And
Be used for will relatively and each the number in five zones of counting device counting added together, to export the device of total count value;
Be used for for two zones, one another will be relatively and several additions of counting of counting device between c and d between predetermined threshold a and b, and the count value that deducts this addition with total count value is to provide the device of difference; And
Be used for this difference and predetermined value are compared, and determine 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.
11. as the equipment of claim 10, wherein relatively and definite device also comprise the storage device that is used to store four predetermined thresholds and predetermined value.
12. the equipment of the information signal that writes down on recording medium of being used to regenerate, this equipment comprises:
Be used for use is installed in the head scanning recording medium on the drum and the information signal of regenerating carries out filtering, remove with the noise contribution that will in the regenerating information signal, comprise, and with this information signal of filtering convert the device of 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:
Be used for each for a plurality of symbol datas, the output signal and the predetermined threshold of transversal filter compared, to obtain the device of likelihood digital information signal, wherein symbol data is included in from the digital information signal of target track regeneration;
Be used to calculate the device of amplitude difference between output signal and the likelihood digital information signal;
Analytical equipment, be used to analyze the output signal of tap coefficient and a plurality of symbol datas of each symbol data, thereby provide the eye pattern of expression coefficient value status signal whether all tap coefficients are all restrained or dispersed and expression output signal whether to open or closed data analysis consequential signal; And
Select and coefficient updating device, be used for according to coefficient value status signal and data analysis consequential signal, provide predetermined original tap coefficient selectively, or new tap coefficient by using this amplitude difference, reproducing digital information signal and inhibit signal thereof to obtain, with this as tap coefficient.
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 |
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| Publication Number | Publication Date |
|---|---|
| CN1187074A true CN1187074A (en) | 1998-07-08 |
| CN1130846C CN1130846C (en) | 2003-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 97121621 Expired - Fee Related CN1130846C (en) | 1996-12-30 | 1997-11-10 | Waveform equalization apparatus |
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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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| 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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