WO2009122642A1 - 再生信号品質評価装置及び方法 - Google Patents
再生信号品質評価装置及び方法 Download PDFInfo
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- WO2009122642A1 WO2009122642A1 PCT/JP2009/000481 JP2009000481W WO2009122642A1 WO 2009122642 A1 WO2009122642 A1 WO 2009122642A1 JP 2009000481 W JP2009000481 W JP 2009000481W WO 2009122642 A1 WO2009122642 A1 WO 2009122642A1
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- reproduction signal
- quality evaluation
- signal quality
- distance difference
- equalization
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10009—Improvement or modification of read or write signals
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10009—Improvement or modification of read or write signals
- G11B20/10046—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10009—Improvement or modification of read or write signals
- G11B20/10046—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter
- G11B20/10055—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter using partial response filtering when writing the signal to the medium or reading it therefrom
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10009—Improvement or modification of read or write signals
- G11B20/10046—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter
- G11B20/10055—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter using partial response filtering when writing the signal to the medium or reading it therefrom
- G11B20/10111—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter using partial response filtering when writing the signal to the medium or reading it therefrom partial response PR(1,2,2,1)
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10009—Improvement or modification of read or write signals
- G11B20/10046—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter
- G11B20/10055—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter using partial response filtering when writing the signal to the medium or reading it therefrom
- G11B20/1012—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter using partial response filtering when writing the signal to the medium or reading it therefrom partial response PR(1,2,2,2,1)
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10009—Improvement or modification of read or write signals
- G11B20/10268—Improvement or modification of read or write signals bit detection or demodulation methods
- G11B20/10287—Improvement or modification of read or write signals bit detection or demodulation methods using probabilistic methods, e.g. maximum likelihood detectors
- G11B20/10296—Improvement or modification of read or write signals bit detection or demodulation methods using probabilistic methods, e.g. maximum likelihood detectors using the Viterbi algorithm
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B2220/00—Record carriers by type
- G11B2220/20—Disc-shaped record carriers
- G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
- G11B2220/2537—Optical discs
Definitions
- the present invention relates to an apparatus and a method for evaluating the quality of a signal that is read from an optical disc and subjected to maximum likelihood decoding.
- PRML Partial Response Maximum Maximum Likelihood
- PRML decoding a recording code sequence is decoded by selecting the most probable state transition sequence. Specifically, the reproduction signal is sampled in synchronization with the reproduction clock, and maximum likelihood decoding is performed based on the Euclidean distance between the reproduction signal sequence and the expected equalization value of the code sequence. Therefore, unlike the conventional method in which discrimination is performed for each bit using a comparator, in PRML decoding, not only the vicinity where the detection pulse of the comparator changes but all the reproduced signals sampled affect the decoding result. For example, even if the jitter value of the reproduced signal is the same, there may be a case where an error of PRML decoding occurs or not. Therefore, it is difficult to predict the error rate of an optical disc apparatus employing PRML decoding using the jitter of the reproduced signal as an index, and an error rate measuring method suitable for PRML decoding is required.
- an object of the present invention is to evaluate the quality of an optical disc reproduction signal with a smaller amount of calculation.
- an apparatus or method for evaluating the quality of a reproduction signal of an optical disc according to an aspect of the present invention is a portion corresponding to a zero cross point of a reproduction signal sequence obtained by PR equalization in a PRML decoding process from a code sequence obtained by PRML decoding.
- a pattern detector or step for detecting a predetermined pattern including a sample point of a pattern corresponding portion detected in the reproduction signal sequence, and a relatively large equalization expected value of the code sequence after the detected pattern The value of the sample point corresponding to the weighted code is calculated by an arithmetic expression corresponding to the detected pattern, and the distance difference between each of the two ideal transition sequences of the reproduction signal sequence and the reproduction signal sequence is calculated.
- a distance difference calculator or step for calculating, and a variation calculator or step for calculating the variation of the calculated distance difference are provided.
- the distance difference between the reproduced signal sequence and each of the two ideal transition sequences is calculated by focusing on the sampling points that dominate the expected equalization value of the code sequence after the detected pattern. . Therefore, it is possible to reduce the amount of calculation related to the calculation compared to the conventional method while maintaining the accuracy of the calculated distance difference relatively high.
- the two ideal transition sequences both relate to paths that can be selected in PRML decoding.
- the calculation object concerning distance difference calculation can be narrowed down further, and the amount of calculation can be reduced further.
- the present invention it is possible to reduce the amount of calculation related to the evaluation as compared with the prior art while maintaining high accuracy and reliability of the quality evaluation of the optical disc reproduction signal. As a result, it is possible to evaluate the quality of an optical disk reproduction signal at a high speed and with low power consumption even in future higher density recording / reproduction and higher order PR equalization.
- FIG. 1 is a configuration diagram of an optical disc apparatus including a reproduction signal quality evaluation apparatus according to an aspect of the present invention.
- FIG. 2 is a configuration diagram of the reproduction signal quality evaluation apparatus according to the first embodiment.
- FIG. 3 is a table listing two paths crossing the zero cross level in PR (1, 2, 2, 1) equalization.
- FIG. 4 is a configuration diagram of a reproduction signal quality evaluation apparatus according to the second embodiment.
- FIG. 5 is a configuration diagram of a reproduction signal quality evaluation apparatus according to the third embodiment.
- FIG. 6 shows two extracted paths that cross the zero cross level in PR (1, 2, 2, 2, 1) equalization.
- FIG. 1 shows a configuration of an optical disc apparatus including a reproduction signal quality evaluation apparatus according to an aspect of the present invention.
- the reproduction signal read from the optical disc 101 by the optical head 10 is amplified by the preamplifier 11 and AC coupled, and then input to the AGC 12.
- the gain is adjusted so that the output of the subsequent waveform equalizer 13 has a constant amplitude.
- the reproduction signal output from the AGC 12 is waveform-shaped by the waveform equalizer 13.
- the waveform-shaped reproduction signal is input to the PLL circuit 14 and the A / D converter 15.
- the PLL circuit 14 extracts a reproduction clock from the reproduction signal.
- the A / D converter 15 samples the reproduction signal with the reproduction clock output from the PLL circuit 14.
- the sample value is input to the adaptive filter 16.
- the adaptive filter 16 corrects the frequency characteristic of the input signal with a predetermined PR equalization characteristic.
- the Viterbi circuit 17 performs maximum likelihood decoding on the reproduced signal sequence output from the adaptive filter 16 to generate binary data, that is, a code sequence.
- the reproduction signal quality evaluation device 18 evaluates the quality of the reproduction signal of the optical disc 101.
- the pattern detection circuit 181 detects a predetermined pattern including a portion corresponding to the zero cross point of the reproduction signal sequence from the code sequence output from the Viterbi circuit 17.
- the zero cross point is a point at which the output of the comparator changes when the reproduction signal series is binarized using the comparator.
- the distance difference calculator 182 is a sample point value of the detected pattern corresponding portion of the reproduced signal sequence output from the adaptive filter 16, and is relative to the expected equalization value of the code sequence after the detected pattern.
- the value of the sample point corresponding to the code that is heavily weighted is calculated using an arithmetic expression corresponding to the detected pattern. As a result, the distance difference calculator 182 calculates the distance difference between the reproduction signal sequence and each of the two ideal transition sequences of the reproduction signal sequence.
- the distance difference means that if two ideal transition sequences are path A and path B, the accumulated value Pa of the distance between the value of each sample point and each equalization expected value related to path A, and the value of each sample point And a cumulative value Pb of distances between each equalization expectation value related to path B (
- the reproduction signal sequence output from the adaptive filter 16 is delayed by a delay circuit (not shown). Is input to the distance difference calculator 182.
- the distance difference calculator 182 calculates the input reproduction signal series with all the arithmetic expressions in synchronization with the adaptive filter 16 and the Viterbi circuit 17, and the pattern detector 181 performs a predetermined pattern. When is detected, the result of the arithmetic expression corresponding to the pattern may be output.
- the variation calculator 183 calculates the variation of the distance difference
- the error rate of the reproduction signal can be obtained from these values. For example, d min is the minimum distance between two paths, and an error rate P ( ⁇ , Pave) expressed by the following equation can be used as an index for evaluating the reproduction signal quality.
- MLSE Maximum Likelihood Sequence Error
- FIG. 2 shows the configuration of the reproduction signal quality evaluation apparatus 18 according to the first embodiment.
- a reproduction signal sequence equalized by PR (1, 2, 2, 1) is input to the distance difference calculator 182.
- PR (1, 2, 2, 1) equalization the expected equalization value of the code sequence takes one of seven values from 0 to 6.
- the expected equalization value “3” corresponds to the zero cross level.
- the pattern detector 181 generates four 5-bit patterns (00x11), (11x00), (00x10), and (11x01) as a predetermined pattern including a portion corresponding to the zero cross point of the reproduction signal sequence from the input code sequence.
- “X” is an arbitrary 1-bit value.
- the codes of the fourth bit and the fifth bit of each pattern are both expected equalization values of the code sequence after the detected pattern. Are weighted by “2”. That is, these two codes are codes that are dominant over the expected equalization value of the code sequence after the detected pattern. Therefore, the distance difference calculator 182 calculates a distance difference from the values y k ⁇ 2 and y k ⁇ 1 of the two sample points of the reproduction signal sequence corresponding to the 4th and 5th bit codes of each pattern.
- FIG. 3 lists two paths (path pairs) that cross the zero cross level in PR (1, 2, 2, 1) equalization.
- the four path pairs belonging to the group I correspond to the pattern (00x11).
- the equalization expected value of the two sample points changes from “1” to “3” (path A) or from “3” to “5” (path B).
- Four path pairs belonging to Group II correspond to the pattern (11x00).
- the equalization expected value of the two sample points changes from “3” to “1” (path A) or from “5” to “3” (path B).
- Two path pairs belonging to Group III correspond to the pattern (00x10).
- the equalization expected value of the two sample points changes from “1” to “2” (path A) or from “3 to“ 4 ”(path B).
- the two path pairs belonging to the group IV correspond to the pattern (11x01)
- the equalization expected value of the two sample points changes from “3” to “2”.
- the distance d min between the path pairs belonging to any group is ⁇ (2 2 +2 2 ).
- the distance difference calculator 182 calculates the values of the two sample points with an arithmetic expression corresponding to the pattern detected by the pattern detector 181, and generates a reproduction signal sequence and two ideal transition sequences.
- from each is calculated.
- the correspondence relationship between the detected pattern and the arithmetic expression is as follows. (1) In the case of pattern (00x11) (B k ⁇ 2 ⁇ D k ⁇ 2 ) + (D k ⁇ 1 ⁇ F K ⁇ 1 ). (2) In the case of pattern (11 ⁇ 00) (D k ⁇ 2 ⁇ F k ⁇ 2 ) + (B k ⁇ 1 ⁇ D K ⁇ 1 ).
- the quality of the signal reproduced from the optical disk can be evaluated with a smaller amount of calculation than before.
- the calculation amount can be further reduced by using one sample point.
- the same effect can be obtained by generalizing PR equalization and PR (a, b, b, a) equalization in which a and b are positive numbers.
- the path A belonging to the group III and the path B belonging to the group IV are selected in the PRML decoding under the condition of the RLL (1, 7) code having the minimum polarity inversion interval of 2. It ’s a safe path. That is, the path B is always selected in the group III, and the path A is always selected in the group IV.
- a path that is not selected by PRML decoding is considered as a virtual path in which a 1-bit error has occurred, so that it is formed on the recording surface of the optical disc 101 that cannot be detected by the I group or II group.
- the pattern (00110) or (11001) corresponding to the repetition of the shortest pit or the shortest mark can be detected.
- the quality of the reproduced signal can be evaluated for all zero cross points of the reproduced signal series.
- the virtual path need not be considered if the difference in probability between the two paths that are most likely to cause errors in PRML decoding is calculated. That is, the paths belonging to the group III and group IV may be excluded from the calculation target of the distance difference calculator 182.
- FIG. 4 shows a configuration of the reproduction signal quality evaluation apparatus 18 according to the second embodiment.
- the pattern detector 181 detects only two 5-bit patterns (00x11) and (11x00) related to the group I and group II shown in FIG. 3 from the input code sequence.
- the distance difference calculator 182 selects one of the calculation formulas I and II according to the pattern detected by the pattern detector 181 and calculates the distance difference
- the quality of the optical disk reproduction signal can be evaluated with a smaller calculation amount than in the first embodiment.
- FIG. 5 shows a configuration of the reproduction signal quality evaluation apparatus 18 according to the third embodiment.
- a reproduction signal sequence equalized by PR (1, 2, 2, 2, 1) is input to the distance difference calculator 182.
- PR (1, 2, 2, 2, 1) equalization the expected equalization value of the code sequence takes any of 9 values from 0 to 8.
- the equalization expected value “4” corresponds to the zero cross level.
- the pattern detector 181 detects two 5-bit patterns (00x11) and (11x00) as a predetermined pattern including a portion corresponding to the zero cross point of the reproduction signal sequence from the input code sequence.
- the distance difference calculator 182 calculates a distance difference from the value y k ⁇ 2 of the sample point of the reproduction signal sequence corresponding to the code.
- FIG. 6 shows a pattern corresponding to the pattern (00x11) out of two paths (path pairs) crossing the zero cross level in PR (1, 2, 2, 2, 1) equalization.
- FIG. 6 shows a pattern corresponding to the pattern (00x11) out of two paths (path pairs) crossing the zero cross level in PR (1, 2, 2, 2, 1) equalization.
- the equalization expected value of the sample points is “3” (path A) or “5” (path B).
- Yes Group I
- FIG. 6 shows a pattern corresponding to the pattern (00x11) out of two paths (path pairs) crossing the zero cross level in PR (1, 2, 2, 2, 1) equalization.
- the distance difference calculator 182 calculates the value of the sample point with an arithmetic expression corresponding to the pattern detected by the pattern detector 181, and the distance difference between the reproduction signal series and each of the two paths.
- is calculated.
- the quality of a signal reproduced from an optical disc can be evaluated with a smaller amount of calculation than before.
- the same effect can be obtained by generalizing PR equalization and PR (a, b, c, b, a) equalization in which a, b, and c are positive numbers.
- the accuracy of the distance difference variation calculation can be increased by increasing the number of sample points to two or three, or considering the virtual path as in the first embodiment.
- reproduction signal quality evaluation apparatus 18 can be configured by a single semiconductor chip, or can be configured by being distributed over a plurality of semiconductor chips.
- the adaptive filter 16 and the Viterbi circuit 17 may be further included.
- the reproduction signal quality evaluation device 18 can be used for control for improving the reliability of the optical disc device 100.
- the signal quality index is obtained from the standard deviation output from the variation calculator 182 and the frequency characteristic indicating the minimum value is set. 100 reliability can be improved.
- the recording power and the recording power are set so that the average value output from the variation calculator 182 becomes 0, or the signal quality index is obtained from the standard deviation output from the variation calculator 183 and the index value is minimized.
- the signal quality index can also be used for adjustment of servo control of the optical head 10. For example, focus servo, tracking servo, disc tilt control, lens spherical aberration correction control, and the like.
- the reproduction signal quality evaluation apparatus can evaluate the quality of an optical disk reproduction signal with a smaller amount of calculation, and thus is useful as an apparatus for evaluating the quality of a signal reproduced on an optical disk apparatus such as a Blu-ray disc apparatus or a DVD apparatus. It is.
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Abstract
Description
182 距離差演算器
183 ばらつき演算器
図2は、第1の実施形態に係る再生信号品質評価装置18の構成を示す。ここで、距離差演算器182にはPR(1,2,2,1)等化された再生信号系列が入力されるものとする。PR(1,2,2,1)等化の場合、符号系列の等化期待値は0から6までの7値のいずれかを取る。本実施形態では等化期待値“3”がゼロクロスレベルに相当する。パターン検出器181は、入力される符号系列から、再生信号系列のゼロクロス点相当部分を含む所定のパターンとして、(00x11)、(11x00)、(00x10)及び(11x01)の4つの5ビットパターンを検出する。“x”は任意の1ビット値である。再生信号系列がPR(1,2,2,1)等化される場合、各パターンの4ビット目及び5ビット目の符号は、いずれも、検出されたパターン後の符号系列の等化期待値において“2”で重み付けられている。すなわち、これら二つの符号は、検出されたパターン後の符号系列の等化期待値に対して支配的となる符号である。したがって、距離差演算器182は、各パターンの4ビット目及び5ビット目の符号に対応する再生信号系列の二つのサンプル点の値yk-2及びyk-1から距離差を算出する。
(1)パターン(00x11)の場合 (Bk-2-Dk-2)+(Dk-1-FK-1)…演算式I
(2)パターン(11x00)の場合 (Dk-2-Fk-2)+(Bk-1-DK-1)…演算式II
(3)パターン(00x10)の場合 (Bk-2-Dk-2)+(Ck-1-EK-1)…演算式III
(4)パターン(11x01)の場合 (Dk-2-Fk-2)+(Ck-1-EK-1)…演算式IV
ただし、Bj=(yj-1)2、Cj=(yj-2)2、Dj=(yj-3)2、Ej=(yj-4)2、Fj=(yj-5)2である。例えば、パターン(11100)が検出され、再生信号系列の二つのサンプル点の値が“4.7”、“2.7”であるとすると、距離差演算器182はこれら値を演算式IIで次のように演算して、
Pa-Pb=(4.7-3.0)2-(4.7-5.0)2+(2.7-1.0)2-(2.7-3.0)2=5.6
距離差|Pa-Pb|として“5.6”を算出する。
図3に示したパスのうち、III群に属するパスA及びIV群に属するパスBは、最小極性反転間隔が2であるRLL(1,7)符号という条件下でのPRML復号では選択されることのないパスである。すなわち、III群ではパスBが、IV群ではパスAが必ず選択される。第1の実施形態では、PRML復号で選択されることのないパスを1ビット誤りが生じている仮想パスとして考慮することで、I群やII群では検出できない、光ディスク101の記録面に形成されている最短ピットや最短マークの繰り返しにあたるパターン(00110)や(11001)を、検出することができる。これにより、再生信号系列のすべてのゼロクロス点について再生信号の品質評価を行うことができる。しかし、PRML復号において最も誤りが生じやすい二つのパスの確からしさの差を算出するのであれば仮想パスは考慮しなくてもよい。すなわち、III群及びIV群に属するパスは距離差演算器182の演算対象から除外しても構わない。
図5は、第3の実施形態に係る再生信号品質評価装置18の構成を示す。ここで、距離差演算器182にはPR(1,2,2,2,1)等化された再生信号系列が入力されるものとする。PR(1,2,2,2,1)等化の場合、符号系列の等化期待値は0から8までの9値のいずれかを取る。本実施形態では等化期待値“4”がゼロクロスレベルに相当する。パターン検出器181は、入力される符号系列から、再生信号系列のゼロクロス点相当部分を含む所定のパターンとして、(00x11)及び(11x00)の二つの5ビットパターンを検出する。再生信号系列がPR(1,2,2,2,1)等化される場合、各パターンの5ビット目の符号は、検出されたパターン後の符号系列の等化期待値において“2”で重み付けられている。すなわち、当該符号は、検出されたパターン後の符号系列の等化期待値に対して支配的となる符号である。したがって、距離差演算器182は、当該符号に対応する再生信号系列のサンプル点の値yk-2から距離差を算出する。
Ck-2-Ek-2
を適用する。ただし、Cj=(yj-3)2、Ej=(yj-5)2である。
Claims (16)
- 光ディスクの再生信号の品質を評価する装置であって、
PRML復号によって得られる符号系列から、PRML復号過程のPR等化によって得られる再生信号系列のゼロクロス点相当部分を含む所定のパターンを検出するパターン検出器と、
前記再生信号系列の前記検出されたパターン対応部分のサンプル点であって、前記検出されたパターン後の前記符号系列の等化期待値において相対的に大きく重み付けられている符号に対応するサンプル点の値を、前記検出されたパターンに応じた演算式で演算して、前記再生信号系列と前記再生信号系列の二つの理想的な遷移系列のそれぞれとの距離差を算出する距離差演算器と、
前記算出された距離差のばらつきを算出するばらつき演算器とを備えている
ことを特徴とする再生信号品質評価装置。 - 請求項1の再生信号品質評価装置において、
前記二つの理想的な遷移系列は、いずれも、PRML復号において選択され得るパスに係るものである
ことを特徴とする再生信号品質評価装置。 - 請求項2の再生信号品質評価装置において、
前記PR等化は、a及びbを正数とするPR(a、b、b、a)等化である
ことを特徴とする再生信号品質評価装置。 - 請求項3の再生信号品質評価装置において、
前記距離差演算器は、前記整数bで重み付けられている符号に対応する一つ又は二つのサンプル点の値から前記距離差を算出する
ことを特徴とする再生信号品質評価装置。 - 請求項2の再生信号品質評価装置において、
前記PR等化は、a、b及びcを正数とするPR(a、b、c、b、a)等化である
ことを特徴とする再生信号品質評価装置。 - 請求項5の再生信号品質評価装置において、
前記距離差演算器は、前記整数cで重み付けられている符号に対応するサンプル点の値から前記距離差を算出する
ことを特徴とする再生信号品質評価装置。 - 請求項1の再生信号品質評価装置において、
前記ばらつき演算器は、少なくとも前記算出された距離差の標準偏差を算出する
ことを特徴とする再生信号品質評価装置。 - 請求項7の再生信号品質評価装置において、
前記ばらつき演算器は、前記算出された距離差の平均値を算出する
ことを特徴とする再生信号品質評価装置。 - 光ディスクの再生信号の品質を評価する方法であって、
PRML復号によって得られる符号系列から、PRML復号過程のPR等化によって得られる再生信号系列のゼロクロス点相当部分を含む所定のパターンを検出するステップと、
前記再生信号系列の前記検出されたパターン対応部分のサンプル点であって、前記検出されたパターン後の前記再生信号系列の等化期待値において相対的に大きく重み付けられている符号に対応するサンプル点の値を、前記検出されたパターンに応じた演算式で演算して、前記再生信号系列と前記再生信号系列の二つの理想的な遷移系列のそれぞれとの距離差を算出するステップと、
前記算出された距離差のばらつきを算出するステップとを備えている
ことを特徴とする再生信号品質評価方法。 - 請求項9の再生信号品質評価方法において、
前記二つの理想的な遷移系列は、いずれも、PRML復号において選択され得るパスに係るものである
ことを特徴とする再生信号品質評価方法。 - 請求項10の再生信号品質評価方法において、
前記PR等化は、a及びbを正数とするPR(a,b,b,a)等化である
ことを特徴とする再生信号品質評価方法。 - 請求項11の再生信号品質評価方法において、
前記距離差を算出するステップでは、前記整数bで重み付けられている符号に対応する一つ又は二つのサンプル点の値から前記距離差が算出される
ことを特徴とする再生信号品質評価方法。 - 請求項10の再生信号品質評価方法において、
前記PR等化は、a、b及びcを正数とするPR(a,b,c,b,a)等化である
ことを特徴とする再生信号品質評価方法。 - 請求項13の再生信号品質評価方法において、
前記距離差を算出するステップでは、前記整数cで重み付けられている符号に対応するサンプル点の値から前記距離差が算出される
ことを特徴とする再生信号品質評価方法。 - 請求項9の再生信号品質評価方法において、
前記ばらつきを算出するステップでは、少なくとも前記算出された距離差の標準偏差が算出される
ことを特徴とする再生信号品質評価方法。 - 請求項15の再生信号品質評価方法において、
前記ばらつきを算出するステップでは、前記算出された距離差の平均値が算出される
ことを特徴とする再生信号品質評価方法。
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CN2009801112533A CN101981624A (zh) | 2008-03-31 | 2009-02-06 | 再现信号质量评价装置以及方法 |
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EP2214173A1 (en) * | 2009-02-03 | 2010-08-04 | Hitachi Consumer Electronics Co., Ltd. | Method of evaluating reproduced signals and optical disc drive |
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US20100322052A1 (en) | 2010-12-23 |
CN101981624A (zh) | 2011-02-23 |
JPWO2009122642A1 (ja) | 2011-07-28 |
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