WO2013171859A1 - Égaliseur de forme d'onde, dispositif et procédé de reproduction d'informations, et programme informatique associé - Google Patents

Égaliseur de forme d'onde, dispositif et procédé de reproduction d'informations, et programme informatique associé Download PDF

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WO2013171859A1
WO2013171859A1 PCT/JP2012/062527 JP2012062527W WO2013171859A1 WO 2013171859 A1 WO2013171859 A1 WO 2013171859A1 JP 2012062527 W JP2012062527 W JP 2012062527W WO 2013171859 A1 WO2013171859 A1 WO 2013171859A1
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Prior art keywords
sample
zero
sample points
cross
read signal
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PCT/JP2012/062527
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English (en)
Japanese (ja)
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庄悟 宮鍋
佐々木　儀央
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パイオニアデジタルデザインアンドマニュファクチャリング株式会社
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Priority to JP2014515410A priority Critical patent/JP5914645B2/ja
Priority to PCT/JP2012/062527 priority patent/WO2013171859A1/fr
Publication of WO2013171859A1 publication Critical patent/WO2013171859A1/fr

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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
    • 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
    • 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
    • G11B20/10305—Improvement or modification of read or write signals signal quality assessment
    • G11B20/10398—Improvement or modification of read or write signals signal quality assessment jitter, timing deviations or phase and frequency errors

Definitions

  • the present invention relates to a waveform equalizer that performs waveform equalization such as filtering processing on a read signal obtained by reading data recorded on an information recording medium such as an optical disc, an information reproducing apparatus including the waveform equalizer, and information
  • the present invention relates to a reproduction method and a computer program technical field.
  • asymmetry of a reproduced signal is detected using sample data, or jitter of a reproduced signal is detected using sample data when the polarity of a plurality of sample data changes.
  • the slope of the rising or falling edge of the playback signal is obtained from the sample values before and after the zero cross point, and the sample data corresponding to the zero cross point is normalized to obtain the phase error and phase error absolute value.
  • Limit equalizer as an example of this type of device sets upper and lower limits of amplitude limit value, for example, forcibly suppress variation of sample points before and after the reference sample point, which is the zero cross point, for example, to improve jitter value Has been proposed (see Patent Document 2).
  • the background art described above has a technical problem in that, for example, there is a possibility that the jitter value varies greatly for each information reproducing apparatus or for each measurement.
  • the present invention has been made in view of the above-described problems, for example.
  • a waveform equalizer, an information reproducing apparatus and method, and a computer program that can improve the measurement accuracy of a jitter value while suppressing variations between apparatuses. It is an issue to provide.
  • the waveform equalizer of the present invention samples an read signal read from a recording medium and acquires a plurality of sample points, and among the acquired plurality of sample points The amplitude values of the plurality of sample points before the zero-cross sample point are close to each other, and the amplitude values of the plurality of sample points after the zero-cross sample point are close to each other.
  • Filtering means for performing a filtering process on the read signal are provided.
  • an information reproducing apparatus of the present invention samples an read signal read from a recording medium and acquires a plurality of sample points, and among the acquired plurality of sample points The amplitude values of the plurality of sample points before the zero-cross sample point are close to each other, and the amplitude values of the plurality of sample points after the zero-cross sample point are close to each other.
  • a waveform equalizer having filtering means for performing a filtering process on the read signal.
  • the information reproducing method of the present invention samples a read signal read from a recording medium to acquire a plurality of sample points, and among the acquired plurality of sample points The amplitude values of the plurality of sample points before the zero-cross sample point are close to each other, and the amplitude values of the plurality of sample points after the zero-cross sample point are close to each other.
  • a filtering step of performing a filtering process on the read signal is performed.
  • the computer program of the present invention is a computer installed in an information reproducing apparatus, which samples a read signal read from a recording medium and acquires a plurality of sample points; Among the plurality of acquired sample points, the amplitude values of the plurality of sample points before the zero cross sample point are close to each other, and the amplitude values of the plurality of sample points after the zero cross sample point are It is made to function as a filtering means for performing a filtering process on the read signals so as to approach the same value.
  • the waveform equalizer includes an acquisition unit that samples a read signal read from a recording medium to acquire a plurality of sample points, and a plurality of sample points before the zero-cross sample point among the acquired sample points.
  • the read signal is filtered so that the amplitude values of the respective sample points approach the same value, and the amplitude values of the plurality of sample points after the zero-cross sample point approach the same value. Filtering means.
  • the reading means samples a read signal read from a recording medium such as an optical disk, and acquires a plurality of sample points.
  • the reading signal may be sampled by, for example, A / D (Analog to Digital) conversion of the reading signal which is an analog signal.
  • a / D Analog to Digital
  • Various known modes can be applied to the sampling of the read signal.
  • the filtering means is arranged so that the amplitude values of the plurality of sample points before the zero-cross sample point among the plurality of obtained sample points approach the same value, and each of the plurality of sample points after the zero-cross sample point
  • the read signal is subjected to a filtering process so that the amplitude values of the two approaches the same value.
  • the “zero cross sample point” means a point where the level (amplitude value) of the sample point should ideally be zero level.
  • a plurality of types of data patterns (for example, “2T mark”, “3T mark”, “4T mark”, etc.) having different run lengths are formed on the recording medium.
  • a jitter conversion coefficient is required. Since this jitter conversion coefficient is determined based on, for example, the amplitude values of sample points before and after the zero cross sample point, if no measures are taken, it must be prepared for each of a plurality of types of data patterns. Providing a jitter conversion coefficient for each of a plurality of types of data patterns leads to an increase in circuit scale, and the jitter value may vary depending on the detection accuracy of the data pattern.
  • the filtering means causes the amplitude values of the plurality of sample points before the zero cross sample point to approach the same value, and each of the plurality of sample points after the zero cross sample point by the filtering unit.
  • the read signal is subjected to a filtering process so that the amplitude values of the read signal approaches the same value.
  • the filtering unit is configured so that the amplitude values of the plurality of sample points immediately before the zero cross sample point among the plurality of acquired sample points approach the same value.
  • the filtering process is performed on the read signal so that the amplitude values of the plurality of sample points immediately after the zero-cross sample point are close to the same value.
  • the average value of the amplitude values of each of the plurality of sample points before the zero cross sample point and the average value of the amplitude values of each of the plurality of sample points after the zero cross sample point And calculating means for calculating a conversion coefficient that is a value used when the jitter value related to the read signal is calculated.
  • the conversion coefficient can be calculated relatively easily, which is very advantageous in practice.
  • a plurality of types of data patterns having different run lengths are formed on the recording medium, and the plurality of sample points before the zero cross sample point are The sample points immediately before the zero-cross sample point for each of the plurality of read signals corresponding to the plurality of types of data patterns, and the plurality of sample points after the zero-cross sample point are a plurality of samples corresponding to the plurality of types of data patterns, respectively. This is the sample point immediately after the zero-cross sample point for each read signal.
  • the sample point immediately before the zero cross sample point for the read signal corresponding to the data pattern having the shortest run length among the plurality of types of data patterns, and the shortest run A calculation unit that calculates a conversion coefficient that is a value used when a jitter value related to the read signal is calculated based on a sample point immediately after a zero cross sample point for a read signal corresponding to a data pattern having a length.
  • the conversion coefficient can be calculated relatively easily, which is very advantageous in practice.
  • a plurality of sample points before a zero cross sample point for a read signal corresponding to a data pattern having a long run length among the plurality of types of data patterns Based on a plurality of sample points after the zero cross sample point for a read signal corresponding to a data pattern having a long run length, a conversion coefficient that is a value used when a jitter value related to the read signal is calculated A calculation means for calculating is further provided.
  • the conversion coefficient can be calculated relatively easily, which is very advantageous in practice.
  • An information reproducing apparatus includes an acquisition unit that samples a read signal read from a recording medium to acquire a plurality of sample points, and a plurality of sample points before the zero-cross sample point among the acquired plurality of sample points.
  • the read signal is filtered so that the amplitude values at the respective sample points approach the same value, and the amplitude values at the plurality of sample points after the zero-cross sample point approach the same value.
  • a waveform equalizer having filtering means for performing processing.
  • the information reproducing apparatus it is possible to improve the measurement accuracy of the jitter value while suppressing the variation between apparatuses as in the waveform equalizer according to the present embodiment described above.
  • the information reproducing apparatus can also adopt various aspects similar to the various aspects according to the waveform equalizer according to the present embodiment.
  • An information reproducing method includes an acquisition step of sampling a read signal read from a recording medium to acquire a plurality of sample points, and a plurality of sample points before the zero-cross sample point among the acquired plurality of sample points.
  • the read signal is filtered so that the amplitude values at the respective sample points approach the same value, and the amplitude values at the plurality of sample points after the zero-cross sample point approach the same value.
  • a filtering step for performing processing includes an acquisition step of sampling a read signal read from a recording medium to acquire a plurality of sample points, and a plurality of sample points before the zero-cross sample point among the acquired plurality of sample points.
  • the information reproducing method it is possible to improve the measurement accuracy of the jitter value while suppressing the variation between the devices as in the waveform equalizer according to the present embodiment described above.
  • the information reproducing method according to the present embodiment can also adopt various aspects similar to the various aspects according to the waveform equalizer according to the present embodiment.
  • the computer program includes an acquisition unit that acquires a plurality of sample points by sampling a read signal read from a recording medium by a computer installed in the information reproducing apparatus, and the acquired plurality of sample points. Of the plurality of sample points before the zero-cross sample point so that the amplitude values of the plurality of sample points approach the same value, and the amplitude values of the plurality of sample points after the zero-cross sample point approach each other. And a filtering means for performing a filtering process on the read signal.
  • the computer program according to the present embodiment information is reproduced from a recording medium such as a CD-ROM (Compact Disc Only Memory) or a DVD-ROM (DVD Read Only Memory) that stores the computer program.
  • a recording medium such as a CD-ROM (Compact Disc Only Memory) or a DVD-ROM (DVD Read Only Memory) that stores the computer program.
  • the information reproducing apparatus according to the present embodiment described above can be made relatively easy. realizable.
  • FIG. 1 is a block diagram showing the configuration of the information reproducing apparatus according to the first embodiment.
  • an information reproducing apparatus 10 includes an optical pickup (OPU) 11 that can irradiate light to an optical disk 50 such as a Blu-ray Disc, a DVD, etc., and a current-voltage conversion amplifier (I / V) 12. , An analog equalizer 13, an analog-digital converter (A / D) 14, a signal amplitude adjusting unit 15, a conversion coefficient measuring unit 16, and a jitter measuring unit 17.
  • OPU optical pickup
  • I / V current-voltage conversion amplifier
  • FIG. 2 is a block diagram showing a configuration of a variable limit equalizer as an example of a signal amplitude adjusting unit according to the first embodiment.
  • the variable limit equalizer includes a plurality of delay units (D) for adding a delay of one clock and a plurality of variable multiplication coefficients (here, “ ⁇ 1.92” and “1.92”).
  • the high-frequency emphasis block having a coefficient multiplier and an adder.
  • the high frequency read sample value output from the high frequency emphasis block is added to the read sample value series input to the adder via a delay unit (3D) that adds a delay of 3 clocks.
  • 3D delay unit
  • the conversion factor measurement unit 16 includes a zero-cross sample detection circuit and an averaging circuit. Then, the conversion coefficient measurement unit 16 outputs the conversion coefficient Twa based on the input signal.
  • FIG. 3 is a block diagram illustrating a configuration of the conversion coefficient measurement unit according to the first embodiment.
  • the zero cross sample detection circuit detects a zero cross sample based on the signal Sa, the signal Sb, and the signal Sc. Specifically, the zero cross sample detection circuit detects the signal Sb as a zero cross sample when all of the following conditions (i) to (iv) are satisfied.
  • the absolute value of the signal Sa is larger than a predetermined value.
  • the absolute value of the signal Sb is smaller than a predetermined value.
  • the absolute value of the signal Sc is larger than a predetermined value.
  • the sign of the signal Sa is different from the sign of the signal Sc.
  • the “predetermined value” is a common value. Such a “predetermined value” may be set, for example, as a value near the half value of the absolute value of the sample value immediately before or after the zero crossing. If zero cross sample detection is performed with the signal before the variable limit equalizer, a desired zero cross sample value can be detected without pattern discrimination. In order to detect a run-length zero-cross sample excluding the shortest run length, the “predetermined value” may be set larger than the shortest run-length amplitude sample value and smaller than the shortest run-length + 1T amplitude value.
  • the conditions (i) to (iv) may be as follows.
  • (I) 'The absolute value of the signal Sa is larger than the predetermined value 1 and smaller than the predetermined value 2.
  • the absolute value of the signal Sb is smaller than the predetermined value 1.
  • the absolute value of the signal Sc is larger than the predetermined value 1 and smaller than the predetermined value 2.
  • the sign of the signal Sa is different from the sign of the signal Sc.
  • predetermined value 1 is, for example, a half value of the shortest run-length amplitude sample value
  • predetermined value 2 is, for example, a value greater than the shortest run-length amplitude sample value and smaller than the shortest run-length + 1T amplitude value.
  • the jitter measuring unit 17 measures the jitter based on the integrated value of the absolute value of the zero cross sample and the conversion factor Twa output from the conversion factor measuring unit 16.
  • FIG. 7 is a conceptual diagram showing an example of a signal waveform output from the analog-digital conversion circuit according to the comparative example.
  • jitter in the time axis direction that is, ⁇ / Tw ⁇ 100, “Tw” is the clock period, “ ⁇ ” is the edge of the reproduction signal (the recording data pattern is “0” ⁇ “1” or “1” ⁇ Standard deviation of fluctuation distribution in the time direction (transient waveform changing to “0”) and jitter in the amplitude axis direction (that is, ⁇ ′ / Tw ′ ⁇ 100, “Tw ′” is the window width in the amplitude direction, “ ⁇ "" Is required to match the standard deviation of the fluctuation distribution in the amplitude direction of the zero-cross sample value corresponding to the edge of the reproduction signal.
  • the circuit scale becomes relatively large in order to directly make the jitter in the time axis direction.
  • the window width Tw ′ (corresponding to the “conversion coefficient Twa” according to the present embodiment) is the amplitude of the sample immediately before the zero cross sample (see “S (n ⁇ 1)”) and the sample immediately after the zero cross sample (“ S (n + 1) ”)).
  • S (n ⁇ 1) the sample immediately before the zero cross sample
  • S (n + 1) the sample immediately after the zero cross sample
  • the measured jitter may deviate greatly from the jitter of the standard player as shown in FIG. 8, for example.
  • the accuracy is improved in all regions. It is difficult to measure jitter well.
  • FIG. 4 is a conceptual diagram showing an example of a signal waveform output from the analog-digital conversion circuit according to the first embodiment.
  • FIG. 5 is a conceptual diagram illustrating an example of a signal waveform output from the signal amplitude adjustment unit according to the first embodiment.
  • the shortest run length in this case, “3T”, in the case of Blu-ray Disc, in each of the immediately preceding sample and the immediately following sample of the zero cross sample, is shown.
  • the amplitude of the sample corresponding to the recording data of “2T”) and the amplitude of the sample corresponding to the recording data other than the shortest run length are different from each other.
  • the signal amplitude adjusting unit 15 is configured so that the amplitude of each of the plurality of samples corresponding to all the run-length recording data in the sample immediately before and after the zero-cross sample approaches the same value. Apply high-frequency emphasis filtering. As a result, as shown in FIG. 6, the signal waveform output from the signal amplitude adjusting unit 15 includes a sample immediately before the zero-cross sample (see “S (n ⁇ 1)”) and a sample immediately after the sample (“S (n + 1)). "See”) In each case, the amplitudes of the samples are substantially the same.
  • the conversion coefficient Twa (corresponding to “window width Tw” according to the comparative example) can be uniquely determined. Specifically, for example, the conversion factor measurement unit 16 calculates a value that is half the difference between the average value of the amplitude immediately before the zero-cross sample and the average value of the amplitude immediately after the zero-cross sample. It is determined as the conversion coefficient Twa. Alternatively, the conversion factor measurement unit 16 converts the half value of the difference between the amplitude of the sample immediately before the zero cross sample corresponding to the shortest run length recording data and the amplitude of the sample immediately after the zero cross sample. The coefficient is determined as Twa. As a result, for example, as shown in FIG. 6, jitter can be obtained with high accuracy.
  • step S101 the control unit (not shown) of the information reproducing apparatus 10 controls the analog equalizer 13 so that the frequency corresponding to the measurement double speed of the optical disc to be measured becomes the frequency enhancement frequency (step S101).
  • step S102 the control unit controls the analog equalizer 13 so that the frequency enhancement amount becomes a value during normal reproduction (step S102).
  • control unit refers to the signal output from the signal amplitude adjustment unit 15, the amplitude of the sample immediately before the zero cross sample is substantially the same for all the run lengths, and immediately after the zero cross sample. It is determined whether the amplitudes of the samples are substantially the same (step S103).
  • step S103 When it is determined that at least one of the amplitude of the sample immediately before the zero-cross sample and the amplitude of the sample immediately after the zero-cross sample is not substantially the same (step S103: No), the control unit controls the frequency related to the signal amplitude adjustment unit 15 The enhancement amount is adjusted (step S104), and the process of step S103 is performed.
  • step S103 when it is determined that the amplitude of the sample immediately before the zero-cross sample is substantially the same and the amplitude of the sample immediately after the zero-cross sample is substantially the same (step S103: Yes), the control unit The jitter measuring unit 17 is controlled so as to obtain the integrated value of the absolute values (step S105).
  • control unit 16 calculates the conversion coefficient measurement unit 16 so as to obtain the integrated value of the absolute value of the sample immediately before the zero cross sample and the integrated value of the absolute value of the sample immediately after the zero cross sample. Is controlled (step S106). At this time, the conversion coefficient measurement unit 16 also calculates the conversion coefficient Twa in parallel.
  • control unit determines whether or not the integration of the absolute value of the zero cross sample has been completed (step S107). When it is determined that the integration of the absolute values of the zero cross samples has not ended (step S107: No), the control unit performs the process of step S105.
  • step S107 when it is determined that the integration of the absolute values of the zero-cross samples has been completed (step S107: Yes), the control unit obtains an average value obtained by dividing the calculated integrated value of the absolute values of the zero-cross samples by the number of integrations. Based on the obtained conversion coefficient Twa, the jitter measuring unit 17 is controlled to calculate jitter (step S108).
  • the “signal amplitude adjusting unit 15” and the “conversion coefficient measuring unit 16” according to the present embodiment are examples of the “waveform equalizer” according to the present invention.
  • the “input of the signal amplitude adjusting unit 15”, the “high frequency emphasis block”, and the “conversion coefficient measuring unit 16” according to the present embodiment are respectively “acquisition unit”, “filtering unit”, and “calculation unit” according to the present invention. Is an example.
  • the technique according to the present embodiment is not limited to a home information reproducing apparatus, but can be applied to, for example, a business-use jitter measuring apparatus and a jitter measuring method.
  • FIG. 11 is a diagram illustrating an example of a conversion coefficient determination method according to the modification.
  • the average value of the absolute values of a plurality of samples before the zero-cross sample corresponding to the recording data of a long run length (for example, “5T”), and the absolute value of the plurality of samples after the zero-cross sample
  • a conversion coefficient Twa is determined based on at least one of the average amplitude values.
  • the conversion coefficient measuring unit 16 calculates the average value (“Twa_Mark”) of the absolute values of a plurality of samples before the zero cross sample corresponding to 5T recording data, and the plurality of samples after the zero cross sample.
  • the smaller value of the average absolute value amplitudes (“Twa_Space”) is obtained as the conversion coefficient Twa.
  • FIG. 12 is a block diagram showing the configuration of the information reproducing apparatus in the second example.
  • FIG. 13 is a block diagram showing a configuration of a waveform equalizer according to the second embodiment.
  • FIG. 14 is a flowchart showing a jitter measurement process according to the second embodiment.
  • the information reproducing apparatus 20 includes a waveform equalizer 21 instead of the signal amplitude adjusting unit 15 and the conversion coefficient measuring unit 16.
  • the waveform equalizer 21 includes a plurality of delay units (D) for adding a delay of one clock, a plurality of coefficient multipliers having a multiplication coefficient (here, “a”), an adder, , And a coefficient multiplier (here, a multiplication coefficient “b”). That is, a variable limit equalizer can be applied to the waveform equalizer 21.
  • the multiplication coefficients a and b are controlled independently, the amplitude value of the sample immediately before the zero cross sample and the amplitude value of the sample immediately after the zero cross sample can be set to predetermined values.
  • the conversion coefficient Twa is determined in advance, and the signal amplitude is adjusted so as to be the determined conversion coefficient Twa.
  • the control unit (not shown) of the information reproducing apparatus 20 determines the amplitude value of the sample immediately before the zero cross sample of the recording data corresponding to the long run length and the amplitude value of the sample immediately after the zero cross sample. Then, it is determined whether or not it is substantially equal to a predetermined value (for example, the same value as a predetermined conversion coefficient Twa) (step S201).
  • a predetermined value for example, the same value as a predetermined conversion coefficient Twa
  • step S201 When it is determined that the amplitude value of the sample immediately before the zero cross sample of the recording data corresponding to the long run length and the amplitude value of the sample immediately after the zero cross sample are not substantially the same as the predetermined value (step S201: No).
  • the control unit adjusts the multiplication coefficient b of the waveform equalizer 21 (step S202).
  • step S201 when it is determined that the amplitude value of the sample immediately before the zero cross sample of the recording data corresponding to the long run length and the amplitude value of the sample immediately after the zero cross sample are substantially the same as the predetermined value (step S201: Yes).
  • the control unit determines whether or not the amplitude of the sample immediately before the zero cross sample is substantially the same and the amplitude of the sample immediately after the zero cross sample is substantially the same for each of the run lengths (see FIG. Step S203).
  • control unit When it is determined that at least one of the amplitude of the sample immediately before the zero-cross sample and the amplitude of the sample immediately after the zero-cross sample is not substantially the same (step S203: No), the control unit performs the multiplication coefficient a of the waveform equalizer 21. Is adjusted (step S204).
  • step S203 when it is determined that the amplitude of the sample immediately before the zero-cross sample is substantially the same and the amplitude of the sample immediately after the zero-cross sample is substantially the same (step S203: Yes), the control unit The jitter measurement unit 17 is controlled so as to obtain the integrated value of the absolute values (step S205).
  • control unit determines whether or not the integration of the absolute value of the zero cross sample has been completed (step S206). When it is determined that the integration of the absolute values of the zero cross samples is not completed (step S206: No), the control unit performs the process of step S205.
  • step S206 when it is determined that the integration of the absolute values of the zero cross samples has been completed (step S206: Yes), the control unit obtains an average value obtained by dividing the integrated value of the obtained absolute values of the zero cross samples by the number of integrations in advance. Based on the determined conversion coefficient Twa, the jitter measuring unit 17 is controlled to calculate the jitter (step S207).

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  • Signal Processing (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

Un égaliseur de forme d'onde (15, 16, 21) comprend un moyen d'obtention qui obtient une pluralité de points échantillons après échantillonnage d'un signal de lecture lu à partir d'un support d'enregistrement (50) et un moyen de filtrage qui exécute un filtrage sur le signal de lecture d'une manière telle que, parmi la pluralité de points échantillons lus, les amplitudes de chacun de la pluralité de points échantillons avant un point échantillon au passage par le point zéro se rapprochent toutes de la même valeur et les amplitudes de chacun de la pluralité de points échantillons pour le point échantillon au passage par le point zéro se rapprochent toutes de la même valeur.
PCT/JP2012/062527 2012-05-16 2012-05-16 Égaliseur de forme d'onde, dispositif et procédé de reproduction d'informations, et programme informatique associé WO2013171859A1 (fr)

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JP2014515410A JP5914645B2 (ja) 2012-05-16 2012-05-16 波形等価器、情報再生装置及び方法、並びにコンピュータプログラム
PCT/JP2012/062527 WO2013171859A1 (fr) 2012-05-16 2012-05-16 Égaliseur de forme d'onde, dispositif et procédé de reproduction d'informations, et programme informatique associé

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WO2008068852A1 (fr) * 2006-12-05 2008-06-12 Pioneer Corporation Appareil et procédé de reproduction d'informations, et programme informatique
WO2008099463A1 (fr) * 2007-02-13 2008-08-21 Pioneer Corporation Appareil et procédé d'enregistrement d'informations, programme informatique et support d'enregistrement

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