CN101819787B - Device and method for testing asymmetry of optical disc - Google Patents
Device and method for testing asymmetry of optical disc Download PDFInfo
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Abstract
The device comprises an RF signal reading system, an equalizer, a comparison level generator, a first comparator, a high-pass filter, an upper half-wave extractor, a lower half-wave extractor, a peak holder, a valley holder, an inverter, a first peak detector, a first valley detector, a second peak detector and a data processing system, the equalizer, the comparison level generator, the first comparator, the high-pass filter, the upper half-wave extractor, the lower half-wave extractor, the peak value retainer, the valley value retainer, the reverser, the first peak value detector, the first valley value detector, the second valley value detector and the second peak value detector can be realized on a programmable logic gate array.
Description
Technical background
The present invention relates to CD, particularly a kind of proving installation of disc asymmetry and method.
Background technology
In the storage of organic dyestuff digital light, recording medium produces irreversible physicochemical change during writing information, forms permanent recording.The laser beam of writing fashionable milliwatt level focuses on the recording medium rete and forms high-energy-density low-light spot, in short time the film temperature in the illumination microcell is elevated to hundreds of degree at the utmost point, face character is changed or destroy fully, form stable recorded information point, i.e. the tunnel.The different length in tunnel has been represented different recorded informations.
In the reproduction process of CD, the length in tunnel is along with environment temperature, the susceptibility of organic dyestuff, and the influence of imprinting Wavelength of Laser etc. is easy to take place bad variation.In order to guarantee that each tunnel length meets 3T～11T, the requirement of 14T need be carried out strictness control imprinting environment, the especially driving power of optical media replication system.In the optical media replication internal system, a special process of constantly adjusting optimum driving power is arranged, the tunnel length of laser beam imprinting is met the requirements.
The asymmetry of CD has been described the symmetric case of CD length hole signal in the process of imprinting.It has represented the imprinting technology of CD, has the disc of good asymmetry, and the bit error rate and wow and flutter all can correspondingly reduce, and are convenient to read.So the detection to asymmetry has very important significance, asymmetry is frequent as an important indicator passing judgment on optical media replication technology in actual production.
In dvd standard, asymmetry is defined as:
ASYM＝[(I
14H+I
14L)/2-(I
3H+I
3L)/2]/I
14 (A)
(I wherein
14H+ I
14LThe intermediate value of)/2 expression 14T signal, (I
3H+ I
3LThe intermediate value of)/2 expression 3T signal, I
14The peak-to-peak value of expression 14T signal, i.e. (I
3H-I
3L).For the DVD disc, the value of ASYM must be in-0.05 and+0.15 between, otherwise show that just the CD burning non-conformity of quality closes the asymmetry requirement.
(3T 14T) is meant 3T～11T to above-mentioned each T, the simulating signal of 14T representative.Because the restriction of run length in the time of coding, the recorded information of CD can only be passed through 3T～11T, and the tunnel of ten kinds of length of 14T representative is represented.T is the cycle of the rotating speed representative of 1 times of speed.Typically comprise 3T～11T, the RF signal waveform of 14T as shown in Figure 5.
All be to be integrated on other based measurement to the measurement of disc asymmetry on the market at present, and the price of complete machine of an integral measuring is very expensive.And this patent aims to provide a kind of apparatus and method of independent measurement asymmetry, and low price is realized easily.
Summary of the invention
The present invention aims to provide a kind of proving installation and method of disc asymmetry, and to realize that it is simple that this device should have principle to the measurement of the asymmetry of DVD disc, it is convenient to realize, practical reliable, can flexible expansion function and the high advantage of cost performance.
Technical solution of the present invention is as follows:
A kind of proving installation of disc asymmetry, characteristics are that this device is made of RF signal read-out system, balanced device, comparative level generator, first comparer, Hi-pass filter, last half-wave extraction apparatus, following half-wave extraction apparatus, peak-holding circuit, valley retainer, reverser, first peak value detector, the first valley detector, the second valley detector, second peak detector and data handling system, and the position relation of above-mentioned component is as follows:
The output terminal of described RF signal read-out system links to each other with the input end of described balanced device, this balanced device has six output terminals, connects the first input end of the input end of described comparative level generator, the input end of Hi-pass filter, last half-wave extraction apparatus, first input end, the input end of first peak value detector and the input end of the first valley detector of following half-wave extraction apparatus respectively;
Second input end of described first comparer of output termination of described Hi-pass filter;
The first input end of described first comparer links to each other with the output terminal of described comparative level generator, this comparer has four output terminals, links to each other with second input end of described upward half-wave extraction apparatus, second input end of described half-wave extraction apparatus down, second input end of described peak-holding circuit, the input end of described reverser respectively;
Second input end of the described valley retainer of output termination of described reverser;
The described first input end of going up the described peak-holding circuit of output termination of half-wave extraction apparatus, the input end of the described second valley detector of output termination of this peak-holding circuit;
The described first input end of the described valley retainer of output termination of half-wave extraction apparatus down, the input end of described second peak detector of output termination of this valley retainer;
The output terminal of described first peak value detector, the first valley detector, the second valley detector and second peak detector all is connected to described data handling system.
Described RF signal read-out system is made of commercial CD-ROM drive common on the market.
The formation of described comparative level generator is: comprise second Hi-pass filter, second comparer, integrator and the comparative level adjuster that connects successively from being input to output, the output feedback end of described comparative level adjuster is connected to second input end of described second comparer, and the output after described comparative level adjuster is stable promptly is the output of described comparative level generator.
Utilize above-mentioned disc asymmetry property testing device to carry out the measuring method of disc asymmetry, this method comprises the steps:
1. CD to be measured is placed in the CD-ROM drive of described RF signal read-out system, when CD-ROM drive energising running promptly reads to coil, remain the RF signal of photometry dish information from described RF signal read-out system output device, this RF signal obtains balanced RF signal by described balanced device elimination clutter after level and smooth, through six output terminals respectively to the input end of described comparative level generator, the input end of Hi-pass filter, the first input end of last half-wave extraction apparatus, the first input end of following half-wave extraction apparatus, the input end of the input end of first peak value detector and the first valley detector is exported described balanced RF signal;
2. described comparative level generator generates a stable comparative level (SL) and imports described first comparer after receiving the balanced RF signal of described balanced device;
After the DC component of the described balanced RF signal of 3. described Hi-pass filter elimination, obtain to remove straight RF signal and import described first comparer;
4. described straight RF signal and the described comparative level (SL) of going compares at described comparer: go straight RF signal just to export " 1 " greater than described comparative level (SL) as if described, go straight RF signal just to export " 0 " as if described less than described comparative level (SL), thereby obtain binaryzation RF signal (RFS), this binaryzation RF signal (RFS) is imported to second input end of second input end of described upward half-wave extraction apparatus, second input end of described half-wave extraction apparatus down, described peak-holding circuit and the input end of described reverser respectively;
5. described go up the half-wave extraction apparatus according to the described binaryzation RF signal (RFS) of input to half-wave in the described balanced RF signal extraction: when binaryzation RF signal (RFS) is logical one, just begin to extract described balanced RF signal value, when binaryzation RF signal (RFS) is logical zero, just stop to extract and keeping level value, obtain the last half-wave of RF signal;
6. described down half-wave extraction apparatus according to the described binaryzation RF signal (RFS) of input to half-wave under the described balanced RF signal extraction: when binaryzation RF signal (RFS) is logical zero, just begin to extract described balanced RF signal value, when binaryzation RF signal (RFS) is logical one, just stop to extract and keeping level value, obtain the following half-wave of RF signal;
7. described peak-holding circuit carries out peak value sampling maintenance processing to the last half-wave of described RF signal: when described binaryzation RF signal (RFS) is logical one, last half-wave to described RF signal carries out peak value sampling, when binaryzation RF signal (RFS) is logical zero, the preceding peak value that once extracts is kept;
8. described binaryzation RF signal (RFS) is by the reverse binaryzation RF signal of described reverser formation logic (RFS '), the following half-wave to described RF signal of the described valley retainer of the binaryzation RF signal of this logic reversal (RFS ') control carries out the valley sampling and keeps handling: when the binaryzation RF of described logic reversal signal (RFS ') during for logical one, following half-wave to described RF signal carries out the valley sampling, when the binaryzation RF of described logic reversal signal (RFS ') when being logical zero, the preceding valley that once extracts is kept;
9. the output of described peak-holding circuit obtains the peak I of 3T signal by the described second valley detector
3H, the output of described valley retainer obtains the valley I of 3T signal by described second peak detector
3L, described balanced RF signal directly obtains the peak I of 14T signal by described first peak value detector
14H, described balanced RF signal directly obtains the valley I of 14T signal by the described first valley detector
14L, with described I
3H, I
3L, I
14HAnd I
14LImport described data handling system, this data handling system is calculated the asymmetry ASYM of CD to be measured according to following formula:
ASYM＝[(I
14H+I
14L)/2-(I
3H+I
3L)/2]/I
14，
Wherein: (I
14H+ I
14LThe intermediate value of)/2 expression 14T signal, (I
3H+ I
3LThe intermediate value of)/2 expression 3T signal, I
14The peak-to-peak value of expression 14T signal, i.e. I
3H-I
3L
The process that described comparative level generator generates comparative level (SL) is as follows:
RF signal after the described equilibrium is by the described second Hi-pass filter elimination DC component, obtain so-called pre-service RF signal, this pre-service RF signal is through described second comparer, level of output behind integrator and the comparative level adjuster (SL '), the Voltage Feedback of this level (SL ') is to described second comparer, this second comparer compares the voltage and the described pre-service RF signal of described level (SL '): if the value of described pre-service RF letter is greater than the magnitude of voltage of described level (SL '), then output " 1 ", if the value of described pre-service RF signal is less than the magnitude of voltage of described level (SL '), then output " 0 ", described integrator carries out integration to " 1 " and " 0 ", described comparative level adjuster is constantly adjusted described comparative level (SL) according to integral result: described integrator just is output as, then the magnitude of voltage with described level (SL ') increases, described integrator is output as negative, then the magnitude of voltage with described level (SL ') reduces, when described integrator is output as 0, stable level of then described comparative level adjuster output, promptly described comparative level (SL).
Because the amplitude of 14T signal is maximum, so do not need to carry out the centre conversion processing.I
14HBe the peak value of balanced back RF signal, I
14LThe valley of balanced back RF signal.
Technique effect of the present invention:
Balanced device of the present invention, comparative level generator, first comparer, Hi-pass filter, last half-wave extraction apparatus, following half-wave extraction apparatus, peak-holding circuit, valley retainer, reverser, first peak value detector, the first valley detector, the second valley detector, second peak detector can be realized on a slice programmable gate array.
The present invention measures motivated, and current all on the market rom test devices are integrated proving installation, measure a lot of parameters simultaneously, thereby the test duration are slow, costs an arm and a leg, and when only needing the parameter of disc asymmetry, waste just occurs.Commercial CD-ROM drive is read, and the mode that programmable logic array is handled has greatly reduced cost on the basis that does not reduce precision, improved efficient.
So it is simple that the present invention has principle, it is convenient, reliable and practical to realize, can flexible expansion function and the high advantage of cost performance.
Description of drawings
Fig. 1 is the structured flowchart of the proving installation of disc asymmetry of the present invention.
Fig. 2 is the structured flowchart of comparative level generator in the proving installation of disc asymmetry of the present invention.
Fig. 3 is for to obtain I from balanced RF signal
3HThe comparison of wave shape synoptic diagram of process.
Fig. 4 is for to obtain I from balanced RF signal
3LThe comparison of wave shape synoptic diagram of process.
Fig. 5 comprises 3T～11T, the RF signal waveform synoptic diagram of 14T
Embodiment
The present invention will be further described below in conjunction with example and accompanying drawing, but should not limit protection scope of the present invention with this.
See also Fig. 1 earlier, Fig. 1 is the structured flowchart of the proving installation of disc asymmetry of the present invention.As seen from the figure, the proving installation of disc asymmetry of the present invention, be made of RF signal read-out system 1, balanced device 2, comparative level generator 3, first comparer 4, Hi-pass filter 5, last half-wave extraction apparatus 6, following half-wave extraction apparatus 7, peak-holding circuit 8, valley retainer 9, reverser 10, first peak value detector 11, the first valley detector 12, the second valley detector 13, second peak detector 14 and data handling system 15, the position relation of above-mentioned component is as follows:
The output terminal of described RF signal read-out system 1 links to each other with the input end of described balanced device 2, this balanced device 2 has six output terminals, connects the first input end of the input end of described comparative level generator 3, the input end of Hi-pass filter 5, last half-wave extraction apparatus 6, first input end, the input end of first peak value detector 11 and the input end of the first valley detector 12 of following half-wave extraction apparatus 7 respectively;
Second input end of described first comparer 4 of the output termination of described Hi-pass filter 5;
The first input end of described first comparer 4 links to each other with the output terminal of described comparative level generator 3, this comparer 4 has four output terminals, links to each other with second input end of described upward half-wave extraction apparatus 6, second input end of described half-wave extraction apparatus 7 down, second input end of described peak-holding circuit 8, the input end of described reverser 10 respectively;
Second input end of the described valley retainer 9 of output termination of described reverser 10;
The described first input end of going up the described peak-holding circuit 8 of output termination of half-wave extraction apparatus 6, the input end of the described second valley detector 13 of output termination of this peak-holding circuit 8;
The described first input end of the described valley retainer 9 of output termination of half-wave extraction apparatus 7 down, the input end of described second peak detector 14 of output termination of this valley retainer 9;
The output terminal of described first peak value detector 11, the first valley detector 12, the second valley detector 13 and second peak detector 14 all is connected to described data handling system 15.
Described RF signal read-out system 1 in the present embodiment is made of commercial CD-ROM drive common on the market, disc to be measured is placed in the CD-ROM drive, when general commercial CD-ROM drive energising running promptly reads to coil, respectively pick out an output line from the RF signal end and the ground terminal of process chip, the magnitude of voltage between two output lines just is the RF signal of wanting required for the present invention.
The formation of described comparative level generator 3 (referring to Fig. 2) is: comprise second Hi-pass filter 17, second comparer 18, integrator 19 and the comparative level adjuster 20 that connects successively from being input to output, the output feedback of described comparative level adjuster 20 is connected to second input end of described second comparer 18, and the output after described comparative level adjuster 20 is stablized promptly is the output of described comparative level generator 3.
Utilize above-mentioned disc asymmetry property testing device to carry out the measuring method of disc asymmetry, this method comprises the steps:
1. CD to be measured is placed in the CD-ROM drive of described RF signal read-out system 1, when CD-ROM drive energising running promptly reads to coil, remain the RF signal of photometry dish information from described RF signal read-out system 1 output device, this RF signal obtains balanced RF signal by the level and smooth back of described balanced device 2 elimination clutters, this equilibrium RF signal through six output terminals respectively to the input end of described comparative level generator 3, the input end of Hi-pass filter 5, the first input end of last half-wave extraction apparatus 6, the first input end of following half-wave extraction apparatus 7, the input end input of the input end of first peak value detector 11 and the first valley detector 12;
Generate a stable comparative level SL and import described first comparer 4 behind the balanced RF signal of the described balanced device 2 of 2. described comparative level generator 3 receptions;
After the DC component of the described balanced RF signal of 3. described Hi-pass filter 5 eliminations, obtain to remove straight RF signal and import described first comparer 4;
4. described straight RF signal and the described comparative level SL of going compares at described comparer 4: go straight RF signal just to export " 1 " greater than described comparative level SL as if described, go straight RF signal just to export " 0 " as if described less than described comparative level SL, thereby obtain binaryzation RF signal RFS, this binaryzation RF signal RFS imports to described second input end of second input end of half-wave extraction apparatus 6, described half-wave extraction apparatus 7 down, second input end of described peak-holding circuit 8 and the input end of described reverser 10 gone up respectively;
5. described go up half-wave extraction apparatus 6 according to the described binaryzation RF signal RFS of input to half-wave in the described balanced RF signal extraction: when binaryzation RF signal RFS is logical one, just begin to extract the last half-wave of described balanced RF signal, when binaryzation RF signal RFS is logical zero, just stop to extract and keeping level value, obtain the last half-wave of RF signal;
6. described down half-wave extraction apparatus 7 according to the described binaryzation RF signal RFS of input to half-wave under the described balanced RF signal extraction: when binaryzation RF signal RFS is logical zero, just begin to extract described balanced RF signal value, when binaryzation RF signal RFS is logical one, just stop to extract and keeping level value, obtain the following half-wave of RF signal;
The last half-wave of 8 pairs of described RF signals of 7. described peak-holding circuit carries out peak value sampling and keeps handling: when described binaryzation RF signal RFS is logical one, last half-wave to described RF signal carries out peak value sampling, when binaryzation RF signal RFS is logical zero, the preceding peak value that once extracts is kept;
8. described binaryzation RF signal RFS is by the reverse binaryzation RF signal RFS ' of described reverser 10 formation logics, the following half-wave to described RF signal of the described valley retainer 9 of binaryzation RF signal RFS ' control of this logic reversal carries out the valley sampling and keeps handling: when the binaryzation RF of described logic reversal signal RFS ' is logical one, following half-wave to described RF signal carries out the valley sampling, when the binaryzation RF of described logic reversal signal RFS ' is logical zero, the preceding valley that once extracts is kept;
The output of 9. described peak-holding circuit 8 obtains the peak I of 3T signal by the described second valley detector 13
3H, the output of described valley retainer 9 obtains the valley I of 3T signal by described second peak detector 14
3L, described balanced RF signal directly obtains the peak I of 14T signal by described first peak value detector 11
14H, described balanced RF signal directly obtains the valley I of 14T signal by the described first valley detector 12
14L, with described I
3H, I
3L, I
14HAnd I
14LImport described data handling system 15, this data handling system 15 is calculated the asymmetry ASYM of CD to be measured according to following formula:
ASYM＝[(I
14H+I
14L)/2-(I
3H+I
3L)/2]/I
14，
Wherein: (I
14H+ I
14LThe intermediate value of)/2 expression 14T signal, (I
3H+ I
3LThe intermediate value of)/2 expression 3T signal, I
14The peak-to-peak value of expression 14T signal, i.e. I
3H-I
3L
See also Fig. 2, the process that described comparative level generator 3 generates described comparative level SL is as follows:
Described balanced RF signal 16 is by described second Hi-pass filter, 17 elimination DC component, obtain so-called pre-service RF signal, this pre-service RF signal is through described second comparer 18, integrator 19 and level SL ' of comparative level adjuster 20 back outputs, the Voltage Feedback of this level SL ' is to described second comparer 18, this second comparer (18) compares magnitude of voltage and the described pre-service RF signal of described level SL ': if the value of described pre-service RF letter is greater than the magnitude of voltage of described level SL ', then output " 1 ", if the value of described pre-service RF signal is less than the magnitude of voltage of described level SL ', then output " 0 ", described integrator 19 carries out integration to " 1 " and " 0 ", described comparative level adjuster 20 is constantly adjusted described comparative level SL ' according to integral result: described integrator 19 just is output as, then the magnitude of voltage with described level SL ' increases, described integrator 19 is output as negative, then the magnitude of voltage with described level SL ' reduces, when described integrator 19 is output as 0, stable level of then described comparative level adjuster 20 outputs, promptly described comparative level SL.
RF signal 16 after the described equilibrium is by described second bandpass filter, 17 elimination DC component, and the parameter of described second Hi-pass filter 17 is consistent with the parameter of described first Hi-pass filter 5.
Described comparative level SL is the output of comparative level adjuster 20, and second input end and pretreated RF signal that this SL level also feeds back to described second comparer 18 simultaneously compare.In circuit start, rule of thumb, described SL level is preset as 0V, and default adjusting range, be generally 0.001V (can select suitable adjusting range as required voluntarily in the practice), the plus-minus amplitude that is adopted when adjusting described SL level as described comparative level adjuster 20 is each.
When described comparative level generator is worked, the described level voltage value SL ' of described pretreated RF signal and the 20 feedback inputs of described comparative level adjuster compares by described second comparer 18, described pretreated RF signal is during greater than the magnitude of voltage of described SL ' level, described second comparer 18 is just exported " 1 ", on the contrary then output " 0 ".Utilize described integrator 19 that " 1 " or " 0 " is carried out integration, its integral result can be that a beginning is fluctuateed down above freezing, is zero curve afterwards reposefully.Described comparative level adjuster 20 is constantly adjusted described SL level according to integral result, and promptly described integrator 19 is output as canonical described comparative level SL is increased an adjusting range value, is 0.001V among the present invention; Otherwise then described comparative level SL is reduced 0.001V, just exportable described comparative level SL after stablizing.Above-mentioned " stablizing " is meant that the comparative level SL with this moment is the fiducial value of binaryzation, and described integrator 19 is output as zero.
Fig. 3 has listed I
3HTest process.Fig. 3 .1 is the balanced RF signal of original RF signal through obtaining behind the described balanced device 2, the binaryzation RF signal RFS of Fig. 3 .2 for described balanced RF signal is obtained after relatively by described comparer 4 through described Hi-pass filter 5 and described comparative level SL, Fig. 3 .3 is the described upper half of going up the described balanced RF signal of half-wave extraction apparatus 6 extractions, can see that the lower half of each ripple is removed.Fig. 3 .4 is the result of the upper half of 8 pairs of described balanced RF signals of described peak-holding circuit, and the result of each crest is extracted out.In the peak value of each ripple that extracts, include 3T～11T, ten kinds of peak values such as 14T, the wherein peak I of 3T
3HBe wherein minimum, just can obtain the I shown in Fig. 3 .5 so utilize the described second valley detector 13 to handle
3H
Fig. 4 has listed I
3LTest process.Fig. 4 .1 is the balanced RF signal of original RF signal through obtaining behind the described balanced device 2, the I of Fig. 4 .2 for binaryzation RF signal RFS is obtained through described reverser 10 afterwards
RFSSignal, Fig. 4 .3 are the lower half of the described balanced RF signal of described half-wave extraction apparatus 7 extractions, can see that the upper half of each ripple is removed.Fig. 4 .4 is the result of the lower half of 9 pairs of described balanced RF signals of described peak-holding circuit, and the result of each trough is extracted out.In the valley of each ripple that extracts, include 3T～11T, ten kinds of valleies such as 14T, wherein the valley I of 3T
3LBe wherein maximum, just can obtain the I shown in Fig. 4 .5 so utilize described second peak detector 14 to handle
3L
Because I
14HAnd I
14LBe whole balanced RF signal peak and valley, survey and just can obtain I so the RF signal after the described equilibrium is directly carried out peak value and valley through described first peak value detector 11 and the first valley detector 12
14HAnd I
14L
Described data handling system 15 receives the I of the described second valley detector 13
3H, second peak detector 14 I
3L, first peak value detector 11 I
14H, the I of the first valley detector 12
14L, and utilize following formula can calculate the asymmetry ASYM of CD to be measured:
ASYM＝[(I
14H+I
14L)/2-(I
3H+I
3L)/2]/I
14，
Wherein: (I
14H+ I
14LThe intermediate value of)/2 expression 14T signal, (I
3H+ I
3LThe intermediate value of)/2 expression 3T signal, I
14The peak-to-peak value of expression 14T signal, i.e. I
3H-I
3L
Claims (4)
1. the proving installation of a disc asymmetry, be characterised in that this device is made of RF signal read-out system (1), balanced device (2), comparative level generator (3), first comparer (4), Hi-pass filter (5), last half-wave extraction apparatus (6), following half-wave extraction apparatus (7), peak-holding circuit (8), valley retainer (9), reverser (10), first peak value detector (11), the first valley detector (12), the second valley detector (13), second peak detector (14) and data handling system (15), the position relation of above-mentioned component is as follows:
The output terminal of 1. described RF signal read-out system (1) links to each other with the input end of described balanced device (2), this balanced device (2) has six output terminals, connects the first input end of the input end of described comparative level generator (3), the input end of Hi-pass filter (5), last half-wave extraction apparatus (6), first input end, the input end of first peak value detector (11) and the input end of the first valley detector (12) of following half-wave extraction apparatus (7) respectively; The formation of described comparative level generator (3) is: comprise second Hi-pass filter (17), second comparer (18), integrator (19) and the comparative level adjuster (20) that connects successively from being input to output, the output feedback end of described comparative level adjuster (20) connects second input end of described second comparer (18), and the output after described comparative level adjuster (20) is stable promptly is the output of described comparative level generator (3);
Second input end of described first comparer of the output termination of 2. described Hi-pass filter (5) (4);
The first input end of 3. described first comparer (4) links to each other with the output terminal of described comparative level generator (3), this first comparer (4) has four output terminals, links to each other with the described input end of going up second input end of half-wave extraction apparatus (6), second input end of described half-wave extraction apparatus (7) down, second input end of described peak-holding circuit (8), described reverser (10) respectively;
Second input end of the described valley retainer of the output termination of 4. described reverser (10) (9);
5. the described first input end of going up the described peak-holding circuit of output termination (8) of half-wave extraction apparatus (6), the input end of the described second valley detector (13) of the output termination of this peak-holding circuit (8);
6. the described first input end of the described valley retainer of output termination (9) of half-wave extraction apparatus (7) down, the input end of described second peak detector of the output termination of this valley retainer (9) (14);
The output terminal of 7. described first peak value detector (11), the first valley detector (12), the second valley detector (13) and second peak detector (14) all is connected described data handling system (15).
2. the proving installation of disc asymmetry according to claim 1 is characterized in that described RF signal read-out system (1) is made of commercial CD-ROM drive common on the market.
3. utilize the described disc asymmetry property testing of claim 1 device to carry out the measuring method of disc asymmetry, it is characterized in that this method comprises the steps:
1. CD to be measured is placed in the CD-ROM drive of described RF signal read-out system (1), when CD-ROM drive energising running promptly reads to coil, remain the RF signal of photometry dish information from described RF signal read-out system (1) output device, this RF signal obtains balanced RF signal by described balanced device (2) elimination clutter and level and smooth back, through six output terminals respectively to the input end of described comparative level generator (3), the input end of Hi-pass filter (5), the first input end of last half-wave extraction apparatus (6), the first input end of following half-wave extraction apparatus (7), the input end of the input end of first peak value detector (11) and the first valley detector (12) is exported this equilibrium RF signal;
2. described comparative level generator (3) generates a stable comparative level SL and imports described first comparer (4) after receiving the balanced RF signal of described balanced device (2);
After the DC component of the described balanced RF signal of 3. described Hi-pass filter (5) elimination, obtain to remove straight RF signal and import described first comparer (4);
4. described straight RF signal and the described comparative level SL of going compares at described comparer (4): if the described direct current RF signal that goes is just exported " 1 " greater than described comparative level SL, go straight RF signal just to export " 0 " as if described less than described comparative level SL, thereby obtain binaryzation RF signal RFS, this binaryzation RF signal RFS is respectively to described second input end going up half-wave extraction apparatus (6), described second input end of half-wave extraction apparatus (7) down, the input end input of second input end of described peak-holding circuit (8) and described reverser (10);
5. described go up half-wave extraction apparatus (6) according to the described binaryzation RF signal RFS of input to half-wave in the described balanced RF signal extraction: when described binaryzation RF signal RFS is logical one, just begin to extract the last half-wave of described balanced RF signal, when binaryzation RF signal RFS is logical zero, just stop to extract and keeping level value, obtain the last half-wave of RF signal;
6. described down half-wave extraction apparatus (7) according to the described binaryzation RF signal RFS of input to half-wave under the described balanced RF signal extraction: when binaryzation RF signal RFS is logical zero, just begin to extract the following half-wave of described balanced RF signal, when binaryzation RF signal RFS is logical one, just stop to extract and keeping level value, obtain the following half-wave of RF signal;
7. described peak-holding circuit (8) carries out peak value sampling maintenance processing to the last half-wave of described RF signal: when described binaryzation RF signal RFS is logical one, last half-wave to described RF signal carries out peak value sampling, when binaryzation RF signal RFS is logical zero, the preceding peak value that once extracts is kept;
8. described binaryzation RF signal RFS is by the reverse binaryzation RF signal RFS ' of described reverser (10) formation logic, binaryzation RF signal RFS ' the described valley retainer of control (9) of this logic reversal carries out valley sampling maintenance processing to the following half-wave of described RF signal: when the binaryzation RF of described logic reversal signal RFS ' is logical one, following half-wave to described RF signal carries out the valley sampling, when the binaryzation RF of described logic reversal signal RFS ' is logical zero, the preceding valley that once extracts is kept;
The output of 9. described peak-holding circuit (8) obtains the peak I of 3T signal by the described second valley detector (13)
3H, the output of described valley retainer (9) obtains the valley I of 3T signal by described second peak detector (14)
3L, described balanced RF signal directly obtains the peak I of 14T signal by described first peak value detector (11)
14H, described balanced RF signal directly obtains the valley I of 14T signal by the described first valley detector (12)
14L, with described I
3H, I
3L, I
14HAnd I
14LImport described data handling system (15), this data handling system
(15) calculate the asymmetry ASYM of CD to be measured according to following formula:
ASYM＝[(I
14H+I
14L)/2-(I
3H+I
3L)/2]/I
14，
Wherein: (I
14H+ I
14LThe intermediate value of)/2 expression 14T signal, (I
3H+ I
3LThe intermediate value of)/2 expression 3T signal, I
14The peak-to-peak value of expression 14T signal, i.e. I
3H-I
3L
4. disc asymmetry property testing device according to claim 3 carries out the measuring method of disc asymmetry, it is characterized in that the process of described comparative level generator generation comparative level SL is as follows:
Described balanced RF signal (16) is by described second Hi-pass filter (17) elimination DC component, obtain so-called pre-service RF signal, this pre-service RF signal is through described second comparer (18), integrator (19) and level SL ' of comparative level adjuster (20) back output, the Voltage Feedback of this level SL ' is to described second comparer (18), this second comparer (18) compares voltage and the described pre-service RF signal of described level SL ': if the value of described pre-service RF letter is greater than the magnitude of voltage of described level SL ', then output " 1 ", if the value of described pre-service RF signal is less than the magnitude of voltage of described level SL ', then output " 0 ", described integrator (19) carries out integration to " 1 " and " 0 ", described comparative level adjuster (20) is constantly adjusted described level SL ' according to integral result: described integrator (19) just is output as, then the magnitude of voltage with described level SL ' increases, described integrator (19) is output as negative, then the magnitude of voltage with described level SL ' reduces, when the output of described integrator (19) stably is 0, stable level of then described comparative level adjuster (20) output, promptly described comparative level SL.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000200420A (en) * | 1998-10-27 | 2000-07-18 | Matsushita Electric Ind Co Ltd | Waveform reshaping device and reproducing signal processor using it |
| CN1295329A (en) * | 1999-10-26 | 2001-05-16 | 松下电器产业株式会社 | Reproducing signal processing unit |
| CN1383148A (en) * | 2001-04-11 | 2002-12-04 | 三星电子株式会社 | Appts. and method for clipping RF signal and compensating clipping level |
| CN1983421A (en) * | 2005-11-30 | 2007-06-20 | 三星电子株式会社 | Information reproducing apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000200420A (en) * | 1998-10-27 | 2000-07-18 | Matsushita Electric Ind Co Ltd | Waveform reshaping device and reproducing signal processor using it |
| CN1295329A (en) * | 1999-10-26 | 2001-05-16 | 松下电器产业株式会社 | Reproducing signal processing unit |
| CN1383148A (en) * | 2001-04-11 | 2002-12-04 | 三星电子株式会社 | Appts. and method for clipping RF signal and compensating clipping level |
| CN1983421A (en) * | 2005-11-30 | 2007-06-20 | 三星电子株式会社 | Information reproducing apparatus |
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