JP2002319138A - Information recording/reproducing device, information reproducing device, information recording/reproducing method and computer-readable recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain the highly accurate reproduction of the recorded multi-valued information stream when this multi-valued information stream is recorded with high density on a recording medium such as an optical disk. SOLUTION: The correction information of the multi-valued information stream formed by arranging values from 1 to n-1 (n is integer >=3) recorded on the optical disk 1 and adding a plurality of 0s before and after each value, and the user information of the multi-valued information stream are reproduced, then the maximum value of reproduced signals of each value from 1 to n-1 of the reproduced correction information is obtained by a demodulating circuit 8, and the waveform equalizing process is decided, which makes each amplitude out of the range separated by the multi-valued data period of each value before and after the respective maximum values to be almost 0 with respect to each reproduced signal, and the waveform equalizing process based on the above decided waveform equalizing process is applied on the reproduction signal of the reproduced user information.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an information recording / reproducing apparatus for recording / reproducing a multi-valued information sequence on a recording medium such as an optical disk, an information reproducing apparatus for reproducing a multi-valued information sequence recorded on a recording medium, and a recording medium. The present invention relates to an information recording / reproducing method for recording / reproducing a multilevel information sequence and a computer-readable recording medium.

[0002]

2. Description of the Related Art Conventionally, when a multivalued information sequence (multivalued data) recorded on a recording medium is reproduced and subjected to a waveform equalization process for reducing intersymbol interference on the reproduced signal, learning of the recording medium is performed. A signal pre-recorded in the area is sampled and held at a predetermined timing, and 1
The waveform equalization coefficient for the waveform equalization process has been obtained by predetermined calculations. Further, prior to the waveform equalization processing, a linearized signal processing is performed on the reproduced signal based on a function obtained by approximating a non-linear characteristic at the time of reproduction with a higher-order function (for example, see Japanese Unexamined Patent Application Publication No.
124167).

[0003]

However, in the above-mentioned conventional technique, a waveform equalization coefficient is obtained by one operation based on a value sampled and held at a predetermined timing with respect to a reproduction signal from a recording medium. Therefore, when a multi-valued information sequence is recorded on a recording medium at high density, accurate waveform equalization cannot be performed if an error occurs due to noise included in the reproduced signal and the waveform equalization coefficient becomes an inappropriate value. There was a problem. In addition, since the processing is performed as a constant function obtained by approximating the non-linear characteristics at the time of performing the linearized signal processing with a higher-order function, it is possible to cope with variations in characteristics of individual recording media and characteristics of information recording / reproducing devices. However, there was a problem that optimal linearized signal processing could not be performed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and when a multi-valued information sequence is recorded at a high density on a recording medium such as an optical disk, the recorded multi-valued information sequence is reproduced with high precision. The purpose is to be able to.

[0005]

In order to achieve the above object, the present invention arranges values from 1 to n-1 (n is an integer of 3 or more) on a recording medium and arranges a plurality of values before and after each value. Of 0
A multi-valued information sequence recording means for recording calibration information of the multi-valued information sequence and user information of the multi-valued information sequence, and reproducing the multi-valued information sequence recorded by the multi-valued information sequence recording means. A multi-valued information sequence reproducing means, and a maximum value of a reproduced signal of each value from 1 to n-1 of the calibration information reproduced by the multi-valued information sequence reproducing device, and a maximum value for each reproduced signal. Waveform equalization processing determining means for determining waveform equalization processing for making each amplitude outside the recording cycle range of each value before and after the value substantially equal to 0, and a reproduction signal of user information reproduced by the multi-value information sequence reproducing means In addition, the present invention provides an information recording / reproducing apparatus including a waveform equalization processing means for performing a waveform equalization processing based on the waveform equalization processing determined by the waveform equalization processing determination means.

A multi-valued information sequence for recording calibration information of a multi-valued information sequence in which a plurality of zeros are added before and after one positive integer value on a recording medium and user information of the multi-valued information sequence. Recording means, multi-valued information sequence reproducing means for reproducing the multi-valued information sequence recorded by the multi-valued information sequence recording means, and reproduction of the positive integer value of the calibration information reproduced by the multi-valued information sequence reproducing means The maximum value of the signal is obtained, and the respective amplitudes of the reproduced signal outside the recording cycle range before and after the maximum value are substantially zero.
Waveform equalization determining means for determining the waveform equalization processing to be performed, and the waveform equalization processing determined by the waveform equalization processing determination means for the reproduction signal of the user information reproduced by the multi-value information sequence reproduction means. The information recording / reproducing apparatus may include a waveform equalization processing unit that performs a waveform equalization process based on the information.

Further, the recording medium has 1 to n-1 (n is 3
The preceding multivalued information sequence in which values up to the above integer values are arranged and a plurality of 0s are added before and after each value, and the above 1 to n-
A multi-valued information sequence recording means for recording calibration information comprising a plurality of rear multi-valued information sequences in each of which a plurality of values up to 1 are successively arranged and user information of the multi-valued information sequence; A multi-level information sequence reproducing means for reproducing the multi-level information sequence recorded by the recording means, and reproducing each value from 1 to n-1 of the front multi-level information sequence reproduced by the multi-level information sequence reproducing means The maximum value of the signal is obtained, the amplitude of each of the reproduction signals before and after the maximum value outside the recording cycle range is set to substantially 0, and 1 to n-1 of the front multi-value information sequence are obtained.
To the respective maximum values after performing the processing of making the respective amplitudes substantially equal to 0 to the respective reproduction signals up to and from the respective reproduction signals obtained by successively arranging a plurality of the respective values from 1 to n-1 of the rear multilevel information sequence. The waveform equalization processing determining means for determining a waveform equalization processing for making the respective amplitudes substantially equal to the respective maximum values after performing the processing for making the respective amplitudes substantially zero, and the multi-value information sequence reproducing means. The information recording / reproducing apparatus may include a waveform equalization processing unit that performs a waveform equalization process on the reproduction signal of the user information based on the waveform equalization process determined by the waveform equalization processing determination unit.

In the information recording / reproducing apparatus as described above, the change of the maximum value of the reproduced signal of each value from 1 to n-1 of the calibration information reproduced by the multi-valued information sequence reproducing means is linearized. Correction function processing determining means for determining the correction function processing for correcting the amplitude value of each reproduction signal, and the correction function processing determination means determining the reproduction signal of the user information reproduced by the multi-value information sequence reproduction means. It is preferable to provide a correction function processing means for performing a correction function process based on the corrected function process.

Further, in the above information recording / reproducing apparatus, the correction function processing may be a linear function processing.

In the information recording / reproducing apparatus as described above, reproduced signals of respective values from 1 to n-1 of the front multi-valued information sequence are shifted by a predetermined number for each recording cycle of the respective values and are superimposed. Each superimposed signal is obtained, and the median value of each superimposed signal and 1 to n−
A correction function process determining means for determining a correction function process for correcting the amplitude value of each of the reproduction signals so that the amplitude values of the reproduction signals successively arranged by plural numbers up to 1 substantially coincide with each other; It is preferable to provide a correction function processing unit that performs a correction function process based on the correction function process determined by the correction function process determination unit on the reproduction signal of the user information reproduced by the multi-value information sequence reproduction unit.

Further, a front multi-value information sequence obtained by adding a plurality of 0s before and after one positive integer value to a recording medium and a rear multi-value information obtained by continuously arranging a plurality of the above positive integer values. A multi-valued information sequence recording means for recording calibration information comprising an information sequence and user information of the multi-valued information sequence, and a multi-valued information sequence reproduction for reproducing the multi-valued information sequence recorded by the multi-valued information sequence recording means Means for superimposing a reproduced signal of a positive integer value of said front multi-valued information sequence reproduced by said multi-valued information sequence reproducing means by a predetermined number for each recording cycle of said values to obtain a superimposed signal. Correction for correcting the amplitude value of the reproduced signal so that the median value of the superimposed signal and the amplitude value of the reproduced signal obtained by continuously arranging a plurality of positive integer values of the rear multi-valued information sequence substantially coincide with each other. Correction function processing determination means for determining function processing, and its correction function The maximum value of the reproduction signal of the positive integer value of the calibration information subjected to the correction function processing determined by the logical determination means is determined, and the reproduction signal is out of the recording cycle range of each value before and after the maximum value. Waveform equalization processing determining means for determining a waveform equalization processing for making each amplitude substantially zero; and a correction determined by the correction function processing determining means for a reproduction signal of user information reproduced by the multi-valued information sequence reproducing means. Correction function processing means for performing a correction function processing based on the function processing; and a waveform based on the waveform equalization processing determined by the waveform equalization processing determination means on the reproduced signal subjected to the correction function processing by the correction function processing means. It is preferable to provide an information recording / reproducing apparatus provided with a waveform equalization processing means for performing the conversion processing.

[0012] Further, a plurality of zeros are added before and after the synchronization information of the multi-valued information sequence obtained by arranging a plurality of types of positive integers on a recording medium and adding a plurality of zeros. Multi-valued information sequence recording means for recording calibration information of a multi-valued information sequence and user information of the multi-valued information sequence, and a multi-valued information sequence for reproducing the multi-valued information sequence recorded by the multi-valued information sequence recording means An information sequence reproducing means, and a superimposition in which reproduced signals of positive integer values of the front multi-valued information sequence reproduced by the multi-valued information sequence reproducing means are shifted by a predetermined number for each recording cycle of the values and superimposed. A signal is obtained, and the amplitude value of the reproduced signal is corrected so that the median value of the superimposed signal and the amplitude value of the reproduced signal obtained by continuously arranging a plurality of positive integer values of the synchronization information substantially coincide with each other. Correction function processing determination means for determining function processing, and its correction function The maximum value of the reproduction signal of the positive integer value of the calibration information subjected to the correction function processing determined by the logical determination means is determined, and the reproduction signal is out of the recording cycle range of each value before and after the maximum value. Waveform equalization processing determining means for determining a waveform equalization processing for making each amplitude substantially zero; and a correction determined by the correction function processing determining means for a reproduction signal of user information reproduced by the multi-valued information sequence reproducing means. Correction function processing means for performing a correction function processing based on the function processing; and a waveform based on the waveform equalization processing determined by the waveform equalization processing determination means on the reproduced signal subjected to the correction function processing by the correction function processing means. It is preferable to provide an information recording / reproducing apparatus provided with a waveform equalization processing means for performing the conversion processing.

Further, in the above information recording / reproducing apparatus, the correction function processing may be a linear function processing. In the information recording / reproducing apparatus as described above, the correction function processing may be a second-order or higher-order function processing.

Further, calibration information and multivalued information of a multivalued information sequence in which values from 1 to n-1 (n is an integer of 3 or more) are arranged and a plurality of zeros are added before and after each value. A multi-valued information sequence reproducing means for reproducing the multi-valued information sequence from the recording medium on which the user information of the sequence is recorded, and each value from 1 to n-1 of the calibration information reproduced by the multi-valued information sequence reproducing device Waveform equalization processing for determining the maximum value of the reproduction signal of each of the above, and determining the waveform equalization processing to make each amplitude outside the recording cycle range of the above values before and after each of the maximum values substantially zero for each reproduction signal. Means, and waveform equalization processing means for performing a waveform equalization process based on the waveform equalization processing determined by the waveform equalization processing determination means on a reproduction signal of the user information reproduced by the multi-value information sequence reproduction means. An information reproducing apparatus is provided.

The multi-valued information is obtained from a recording medium in which calibration information of a multi-valued information sequence obtained by adding a plurality of zeros before and after one positive integer value and user information of the multi-valued information sequence are recorded. A multi-valued information sequence reproducing means for reproducing a sequence, and a maximum value of a reproduced signal of a positive integer value of the calibration information reproduced by the multi-valued information sequence reproducing device is obtained, and a value before and after the maximum value for the reproduced signal is obtained. A waveform equalization processing determining means for determining a waveform equalization processing for making each amplitude outside the recording cycle range of each value substantially zero; and a reproduction signal of user information reproduced by the multi-value information sequence reproduction means, The information reproducing apparatus may include a waveform equalization processing unit that performs a waveform equalization process based on the waveform equalization process determined by the equalization process determination unit.

Further, a front multi-valued information sequence formed by arranging values from 1 to n-1 (n is an integer of 3 or more) and adding a plurality of 0s before and after each of the values and 1 to n The multi-value information sequence is reproduced from a recording medium in which calibration information including a rear multi-value information sequence in which a plurality of values up to -1 are successively arranged and user information of the multi-value information sequence are recorded. Value information sequence reproducing means, and the maximum value of the reproduced signals of each value from 1 to n-1 of the front multi-valued information sequence reproduced by the multi-valued information sequence reproducing means is determined. To make the respective amplitudes outside the recording cycle range of the above values before and after the maximum value of the above-mentioned values substantially zero, and to make the respective amplitudes substantially zero for the reproduced signals from 1 to n-1 of the front multi-valued information sequence. , And a plurality of each of the maximum values after the application and 1 to n-1 of the rear multi-valued information sequence. A waveform equalization process determining means for determining a waveform equalization process for substantially equalizing each maximum value after performing the process of making each of the amplitudes substantially equal to 0 to each of the reproduced signals arranged in succession; If the information reproducing apparatus includes a waveform equalization processing unit that performs a waveform equalization process based on the waveform equalization process determined by the waveform equalization process determination unit on the reproduction signal of the user information reproduced by the information sequence reproduction unit. Good.

In the information reproducing apparatus as described above, the change of the maximum value of the reproduced signal of each value from 1 to n-1 of the calibration information reproduced by the multi-valued information sequence reproducing means is linearized. Correction function processing determining means for determining a correction function processing for correcting the amplitude value of each of the reproduced signals, and a correction function processing determining means for determining a reproduced signal of user information reproduced by the multi-valued information sequence reproducing means. It is preferable to provide a correction function processing means for performing a correction function process based on the corrected function process. Further, in the above information reproducing apparatus, the correction function processing may be a linear function processing.

In the information reproducing apparatus as described above, the reproduced signals of each value from 1 to n-1 of the front multi-valued information sequence are superimposed by being shifted by a predetermined number for each recording cycle of each value. Of each superimposed signal, and the median value of each superimposed signal and 1 to n-1
Correction function processing determining means for determining a correction function processing for correcting the amplitude value of each of the reproduced signals so that the amplitude values of each of the reproduced signals successively arranged in plurality are substantially equal to each other. It is preferable to provide an amplitude correction unit for performing a correction function process based on the correction function process determined by the correction function process determination unit on the reproduction signal of the user information reproduced by the value information sequence reproduction unit.

Further, a front multi-value information sequence in which a plurality of 0s are added before and after one positive integer value, and a rear multi-value information sequence in which a plurality of the positive integer values are continuously arranged. A multi-valued information sequence reproducing means for reproducing the multi-valued information sequence from a recording medium on which calibration information and user information of the multi-valued information sequence are recorded,
A superimposition signal is obtained by superimposing a reproduction signal of a positive integer value of the front multi-value information sequence reproduced by the multi-value information sequence reproducing means by a predetermined number every recording cycle of each of the above values and superimposing the superposed signals. A correction function process for correcting the amplitude value of the reproduction signal so that the median value of the combined signal and the amplitude value of the reproduction signal formed by continuously arranging a plurality of positive integer values of the rear multi-valued information sequence substantially coincide with each other. Correction function processing determining means for determining;
The maximum value of a reproduction signal having a positive integer value of the calibration information subjected to the correction function processing determined by the correction function processing determination means is obtained, and the recording cycle of each value before and after the maximum value for the reproduction signal is obtained. Waveform equalization processing deciding means for deciding waveform equalization processing for making each amplitude outside the range substantially zero, and the correction function processing deciding means deciding on a reproduced signal of user information reproduced by the multi-valued information sequence reproducing means. Correction function processing means for performing a correction function processing based on the corrected correction function processing, and a waveform equalization processing determined by the waveform equalization processing determination means on the reproduced signal subjected to the correction function processing by the correction function processing means. The information reproducing apparatus may be provided with a waveform equalization processing unit that performs a waveform equalization process based on the information.

Further, a plurality of zeros are added before and after the synchronization information of the multi-valued information sequence obtained by arranging a plurality of one kind of positive integers and adding a plurality of zeros. A multivalued information sequence reproducing means for reproducing the multivalued information sequence from a recording medium on which the calibration information of the multivalued information sequence and the user information of the multivalued information sequence are recorded; A superimposed signal is obtained by superimposing the reproduced signals of the positive integer value of the partial multi-valued information sequence by shifting by a predetermined number for each recording cycle of each of the above values to obtain a superimposed signal. Correction function processing determining means for determining a correction function processing for correcting the amplitude value of the reproduction signal so that the amplitude value of the reproduction signal formed by arranging a plurality of numerical values in succession substantially coincides with each other; The above calibration information that has been subjected to the determined correction function processing The maximum value of the reproduction signal of a positive integer value of the above is determined, and the waveform for determining the waveform equalization process for making the respective amplitudes outside the recording cycle range of the above values before and after the maximum value of the reproduction signal substantially zero is determined. Conversion processing determining means, and a correction function processing means for performing a correction function processing based on the correction function processing determined by the correction function processing determination means to the reproduction signal of the user information reproduced by the multi-value information sequence reproduction means,
An information reproducing apparatus including a waveform equalization processing unit that performs a waveform equalization process based on the waveform equalization process determined by the waveform equalization process determination unit on the reproduction signal that has been subjected to the correction function processing by the correction function processing unit. It is good to

Further, in the information reproducing apparatus as described above, the correction function processing may be a linear function processing. In the information reproducing apparatus as described above, the correction function processing may be a second-order or higher-order function processing.

Further, 1 to n-1 (n is 3
The calibration information of the multi-valued information sequence and the user information of the multi-valued information sequence obtained by arranging the values up to the above integer values and adding a plurality of 0s before and after each value are recorded from the recording medium. Is reproduced, and the maximum value of the reproduced signal of each value from 1 to n-1 of the reproduced calibration information is obtained, and before and after the maximum value of each reproduced signal. Information recording for determining a waveform equalization process for making the respective amplitudes outside the recording cycle range of the above values substantially equal to 0, and performing a waveform equalization process on the reproduced signal of the reproduced user information based on the determined waveform equalization process. Provide a playback method.

[0023] Further, calibration information of a multi-valued information sequence in which a plurality of zeros are added before and after one positive integer value and user information of the multi-valued information sequence are recorded on the recording medium. Reproduce the calibration information and user information recorded therefrom, find the maximum value of the reproduced signal of a positive integer value of the reproduced calibration information, and for the reproduced signal, the value of each of the values before and after the maximum value An information recording / reproducing method may be adopted in which a waveform equalization process for making each amplitude outside the recording cycle range substantially zero is determined, and a waveform equalization process based on the determined waveform equalization process is performed on a reproduced signal of the reproduced user information. .

Further, 1 to n-1 (n is 3
The preceding multivalued information sequence in which values up to the above integer values are arranged and a plurality of 0s are added before and after each value, and the above 1 to n-
A calibration information consisting of a rear multi-value information sequence in which each value up to 1 is continuously arranged in plurals and a user information of the multi-value information sequence are recorded, and the calibration information recorded there is recorded from the recording medium. And the user information are reproduced, and the maximum value of the reproduced signal of each value from 1 to n-1 of the reproduced front multi-valued information sequence is obtained. Each amplitude outside the recording cycle range of the value is set to approximately 0, and each maximum value after performing the process of setting each amplitude to approximately 0 for each reproduced signal from 1 to n-1 of the front multi-valued information sequence. And the respective maximum values after performing the processing of making each of the amplitudes substantially zero for each of the reproduced signals sequentially arranged in plurals from 1 to n-1 of the rear multi-valued information sequence, respectively. The waveform equalization process to be performed is determined, and the determination is performed on the reproduced signal of the reproduced user information. Waveform equalization processing based on the waveform equalizing process may be in the information recording and reproducing method of applying a.

In the information recording / reproducing method as described above, the amplitude of each of the reproduced signals is adjusted so that the change of the maximum value of the reproduced signal of each value from 1 to n-1 of the reproduced calibration information is linearized. A correction function process for correcting the value may be determined, and a correction function process based on the determined correction function process may be performed on the reproduced signal of the reproduced user information. Further, in the above information recording / reproducing method, the correction function processing may be a linear function processing.

In the information recording / reproducing method as described above, the reproduced signals of the respective values from 1 to n-1 of the front multi-valued information sequence are overlapped by being shifted by a predetermined number in each recording cycle of the respective values. The superimposed signals obtained by superimposition are obtained, and the median value of each superimposed signal and the amplitude value of each reproduced signal obtained by continuously arranging a plurality of each of the rear multi-valued information sequence from 1 to n-1 are calculated. An information recording / reproducing method for determining a correction function process for correcting the amplitude value of each reproduction signal so as to substantially match each other, and performing a correction function process based on the determined correction function process on the reproduction signal of the reproduced user information. Good to do.

Further, a front multi-value information sequence in which a plurality of zeros are added before and after one positive integer value on a recording medium and a rear multi-value information in which a plurality of the positive integer values are continuously arranged. The calibration information comprising the information sequence and the user information of the multi-value information sequence are recorded, and the calibration information and the user information recorded thereon are reproduced from the recording medium, and the front multi-value of the reproduced calibration information is recorded. The reproduction signal of the positive integer value of the information sequence is shifted by a predetermined number for each recording cycle of the positive integer value and superimposed to obtain a superposition signal, and the median value of the superposition signal and the positive A correction function process for correcting the amplitude value of the reproduction signal is determined so that the amplitude value of the reproduction signal obtained by continuously arranging a plurality of integer values of Find the maximum value of the playback signal of the positive integer value of the above calibration information A waveform equalization process for making the respective amplitudes outside the recording cycle range of the positive integer before and after the maximum value substantially equal to 0 for the reproduced signal is determined, and the determined correction function is applied to the reproduced signal of the reproduced user information. An information recording / reproducing method in which a correction function process based on the process is performed and a waveform equalization process based on the determined waveform equalization process is performed on the reproduction signal on which the correction function process is performed may be used.

In addition, a plurality of zeros are added before and after the synchronizing information of the multi-value information sequence obtained by arranging a plurality of types of positive integers on the recording medium and adding a plurality of zeros. The calibration information of the multi-valued information sequence and the user information of the multi-valued information sequence are recorded, and the calibration information and the user information recorded thereon are reproduced from the recording medium. The reproduction signal of the positive integer value of the partial multi-valued information sequence is shifted by a predetermined number every recording cycle of the positive integer value to be superimposed to obtain a superimposition signal. A correction function process for correcting the amplitude value of the reproduction signal is determined so that the amplitude value of the reproduction signal obtained by continuously arranging a plurality of integer values of Find the maximum value of the playback signal of the positive integer value of the above calibration information A waveform equalization process for making the respective amplitudes outside the recording cycle range of the positive integer before and after the maximum value substantially equal to 0 for the reproduced signal is determined, and the determined correction function is applied to the reproduced signal of the reproduced user information. An information recording / reproducing method in which a correction function process based on the process is performed and a waveform equalization process based on the determined waveform equalization process is performed on the reproduction signal on which the correction function process is performed may be used.

Further, in the above information recording / reproducing method, it is preferable that the correction function processing is a linear function processing. In the information recording / reproducing method as described above, the correction function processing may be a second-order or higher-order function processing.

Further, the calibration information of the multi-value information sequence obtained by adding a plurality of zeros before and after one positive integer value and the user information of the multi-value information sequence are reproduced before the reproduction of the user information. A computer-readable recording medium on which the calibration information is recorded so as to be reproduced first is provided. Also, a front multi-valued information sequence formed by arranging values from 1 to n-1 (n is an integer of 3 or more) and adding a plurality of 0s before and after each value and the above 1 to n-1 Of the multivalued information sequence and the user information of the multivalued information sequence.The calibration information is reproduced first before the reproduction of the user information. It is good to make into the computer readable recording medium which is recorded in such a manner.

Further, a front multi-valued information sequence in which a plurality of zeros are added before and after one positive integer value, and a rear multi-valued information sequence in which a plurality of the positive integer values are continuously arranged. It is preferable that the calibration information and the user information of the multi-valued information sequence are stored in a computer-readable recording medium in which the calibration information is recorded so as to be reproduced first before the reproduction of the user information. Furthermore, the synchronization information of the multi-value information sequence obtained by arranging a plurality of one kind of positive integer values and adding a plurality of 0s, and the multi-valued information obtained by adding a plurality of 0s before and after the positive integer value It is preferable that the calibration information of the information sequence and the user information of the multi-valued information sequence be a computer-readable recording medium in which the calibration information is recorded so as to be reproduced first before the reproduction of the user information.

[0032]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a functional block diagram showing a configuration of an optical disk device according to an embodiment of the present invention. The optical disc 1 includes a CD-ROM disc, a CD-R / R
It is a recording medium such as a RW disk and a DVD disk, and a recording medium such as a CD-R / RW disk and a DVD disk capable of recording data. A spiral or concentric track is formed on the recording surface. Record by forming marks. However, data "0" is recorded by not forming a mark. Also, the tracks formed on the optical disk 1 are slightly meandering at a constant cycle.

A spindle motor (motor) 2 rotates the optical disk 1 at a predetermined rotation speed or angular speed during data recording and data reproduction. The optical head 3 irradiates a laser beam spot on the optical disc 1 during data recording to record a mark having a size corresponding to the data, and scans a portion of the optical disc 1 where the mark is recorded with the laser beam spot during data reproduction. The electric signal obtained by the above is output to the operational amplifier circuit 4. The operational amplifier circuit 4 arithmetically amplifies the electric signal output from the optical head 3, outputs a reproduced signal corresponding to the size of a mark on the optical disk 1 to the demodulator circuit 8, and outputs a laser beam spot on the recording surface of the optical disk 1. The servo circuit 5 outputs a focus error signal indicating whether or not the laser beam is in focus, a tracking error signal indicating whether the laser beam spot is scanning along the track, a signal corresponding to the meandering of the track, and the like.

The servo circuit 5 focuses the laser beam spot on the recording surface of the optical disc 1 based on the focus error signal, the tracking error signal, and the signal corresponding to the meandering of the track, which are output from the operational amplifier circuit 4, and corrects the track. The optical head 3 is driven to scan the optical disk 1, and the optical disk 1 is rotated by the motor 2 at a constant linear velocity or a constant angular velocity. The modulation circuit 6 converts the data input from the host computer (not shown) into multivalued data, after converting the mark and space (multivalued data = 0: A signal indicating that nothing is recorded is output to the laser drive circuit 7. The laser drive circuit 7 outputs a signal for recording a mark on the optical disc 1 with laser light to the optical head 3 based on the signal output from the modulation circuit 6.

The demodulation circuit 8 performs signal processing according to the present invention on the reproduction signal corresponding to the mark on the optical disk 1 output from the operational amplification circuit 4 to reproduce multi-value data, and outputs it to the host computer. . Although not shown, a mechanism for moving the optical head 3 in the radial direction of the optical disk 1 and searching for data on the optical disk 1 is also provided. The optical disc device includes a CD-R / RW drive for recording and reproducing data on and from an optical disc,
This figure shows an example of the configuration of an information recording / reproducing apparatus such as a DVD drive. When the present invention is applied to an information reproducing apparatus such as a CD-ROM drive, only a functional unit related to data reproduction such as the demodulation circuit is provided, and data for an optical disc is read. Perform only playback.

FIG. 2 is a functional block diagram showing an internal configuration of the demodulation circuit 8 shown in FIG. The A / D converter 11
The reproduction signal of the multi-valued information sequence (a data sequence composed of a plurality of multi-valued data) output from the operational amplifier circuit 4 of FIG. The first memory 12 stores digital signal data output from the A / D converter 11. The correction table 13 performs linearization processing (non-linearity correction processing) according to the present invention on the data stored in the first memory 12 and outputs the data to the FIR filter 14. FIR (Fini
te Impulse Response) filter 1
4 performs a waveform equalization process according to the present invention on the data subjected to the linearization process by the correction table 13 and outputs the data to the second memory 15.

The second memory 15 stores the data after the waveform equalization processing output from the FIR filter 14. The multi-level determination unit 16 makes a predetermined determination on the data stored in the second memory 15 and outputs the data as multi-level data based on the determination result. The arithmetic control unit 17 reads data from the first memory 12, performs an operation of determining a value of the correction table 13 according to the present invention based on the data, and sets the determined value in the correction table 13. , The data from the second memory 15 and the FIR filter 1 according to the present invention based on the data.
4 is performed to determine the waveform equalization coefficient, and control processing for setting the determined waveform equalization coefficient in the FIR filter 14 is performed. The demodulation circuit having such a configuration performs the linearization processing and the waveform equalization processing according to the present invention to reproduce multi-value data.

Next, the basic processing of the waveform equalization processing according to the present invention in the demodulation circuit 8 will be described.
Here, a case where the multi-value data is 8-value data will be described as an example. FIG. 3 is a diagram showing an example of a mark shape when each of eight-value data is recorded on an optical disc. FIG. 4 is a waveform diagram showing an example of a solitary wave of each reproduction signal when each mark shown in FIG. 3 is recorded alone on the optical disc 1. FIG. 5 is a diagram for explaining a waveform equalization process performed on multi-value data. FIG. 6 is a block diagram showing the internal configuration of the FIR filter 14 shown in FIG.

As shown in FIG. 3, when recording multi-valued data on the optical disc 1, a mark of which size is changed according to the multi-valued levels 0 to 7 is formed on the recording surface ( However, the fact that no mark is formed for "0" corresponds to recording). In order to increase the recording density of the multi-valued information sequence on the optical disc 1, when the multi-valued data is recorded close to each other, as shown in FIG. Since the multi-level data cycle (multi-level data recording cycle) is shorter than the cycle in which the amplitude value is “0”, the waveform of each multi-level data at the time of reproduction is influenced by other adjacent multi-level data. An intersymbol interference phenomenon occurs in which the amplitude value differs from the peak amplitude value of the solitary wave.

In order to solve the problem caused by the intersymbol interference phenomenon, the multi-value data is out of the range (X0 or less and X2 or more) around the peak value X1 at the center of the solitary wave shown in FIG. (B) of FIG. 5, the time separated by the multi-value data period (X0 or less and X2 or more)
It is preferable to perform a waveform equalization process to make the amplitude value of the signal “0” approximately “0”. Therefore, the same value as the amplitude value of the peak of the solitary wave of the multilevel data can be detected, and the reproduction of the multilevel data can be accurately performed. Therefore, an FIR filter 14 for performing a waveform equalization process by performing a filtering process on a reproduced signal of a multi-valued information sequence is provided, and an amplitude value outside the multi-valued data cycle range is substantially determined for all data 0 to 7. The filter coefficient of the filter processing to be set to “0” is obtained and set.

As shown in FIG. 6, the FIR filter 1
Reference numeral 4 denotes three first to third delay circuits 20 to 22, a first multiplier 23 for multiplying an output signal of the first delay circuit 20 by a filter coefficient α which is a waveform equalization coefficient, and a third delay circuit 22. A second multiplier 24 for multiplying the output signal by a filter coefficient β which is also a waveform equalization coefficient, and an adder 2 for adding each output signal of the first multiplier 23, the second delay circuit 21 and the second multiplier 24
5 The calculation for determining the filter coefficient (α, β) in the calculation control unit 17 will be described. First, based on the peak value X1 of the solitary wave and the amplitude value (X0, X2) at a point separated from the multivalued data period therefrom, the filter coefficients (α, β) of The respective initial values (α0, β0) are obtained.

[0042]

Α0 = X0 / X1 β0 = X2 / X1

The initial values (α0, β0) are set in the FIR filter 14, the data of each solitary wave is input and subjected to a filtering process, and a point of the output data separated from the central peak value by a multivalued data period. The filter coefficients (α, β) are changed so that the amplitude value in the step (c) falls within a predetermined range centered on “0” (that is, so as to be approximately “0”). Such a process is performed for each of the data 0 to 7, and finally, a filter coefficient of a filter process for making the amplitude value outside the multi-value data cycle range substantially “0” is obtained for all the data. Thus, before the user information is input to the FIR filter 14, the filter coefficient (α,
β) is determined and set in the FIR filter 14, and the FI
The waveform equalization processing in the R filter 14 is determined to be the optimum processing. Here, the filter coefficients of the FIR filter 14 are -α, 1, -β (“1” is fixed), but the coefficients may be normalized such that the sum of the filter coefficients becomes 1. .

In this manner, the gain of the FIR filter 14 can be set to 1, so that the amplitude when the reproduction signal is input to the FIR filter 14 and the amplitude when the reproduction signal is output from the FIR filter 14 do not change, and the precision during the calculation (effective Bit number) can be made constant, and the circuit of the FIR filter 14 can be easily realized by using a general-purpose circuit.
Equipment costs can also be reduced. Further, the configuration in the FIR filter 14 shown in FIG. 6 is an example, and if more delay circuits and multipliers are provided to increase the number of data to be added by the adder, the filter processing can be performed with high accuracy.

Next, an embodiment of the waveform equalization processing according to the present invention will be described. (1) First Embodiment (Embodiment of Claims 1, 11 and 21) In this first embodiment, when the optical disk device is an information recording / reproducing device, the optical head 3, the modulation circuit 6, and the laser drive circuit are used. 7 is a multi-value information sequence calibration information in which values from 1 to n-1 (n is an integer of 3 or more) are arranged on a recording medium and a plurality of "0" s are added before and after each value. And a function of a multi-valued information sequence recording means for recording user information of a multi-valued information sequence composed of arbitrary multi-valued data.

The optical head 3 and the operational amplifier 4
Function as a multi-valued information sequence reproducing means for reproducing the multi-valued information sequence recorded by the multi-valued information sequence recording means.
Further, the A / D conversion unit 11, the first memory 12, the FIR filter 14, the second memory 15, the arithmetic control unit 17 and the like of the demodulation circuit 8 serve as one of the calibration information reproduced by the multi-valued information sequence reproducing unit. From the maximum value of the reproduction signal of each value from n to n−1, and a waveform or the like that makes each amplitude of the reproduction signal before and after the maximum value outside the recording cycle range of each value substantially “0”. It performs the function of a waveform equalization processing determining means for determining the equalization processing. Further, the FIR filter 14 and the like perform a waveform equalization process based on the waveform equalization process determined by the waveform equalization process determination unit on the reproduction signal of the user information reproduced by the multilevel information sequence reproduction unit. Performs the function of waveform equalization processing means.

When the optical disk device is an information reproducing device, the optical head 3, the operational amplifier circuit 4, etc., arrange values from 1 to n-1 (n is an integer of 3 or more) and arrange each value. A multi-valued information sequence reproduction for reproducing the multi-valued information sequence from a recording medium in which calibration information of a multi-valued information sequence obtained by adding a plurality of “0” before and after and user information of an arbitrary multi-valued information sequence are recorded. It fulfills the function of the means, and the other functions are the same as those of the information recording / reproducing apparatus. Further, the optical disk 1 recorded in the first embodiment or the optical disk 1 used for data reproduction has a value ranging from 1 to n-1 (n is an integer of 3 or more), and a plurality of values are arranged before and after each value. Before the reproduction of the user information, the calibration information of the multi-value information sequence obtained by adding “0” and the user information of the multi-value information sequence composed of arbitrary multi-value data are reproduced first. (For example, the user information is recorded after the calibration information).

FIG. 7 is a signal waveform diagram of a multi-value information sequence of calibration information and user information used in the waveform equalization processing of the first embodiment. As shown in FIG. 1, the optical disc 1 arranges values 1 to 7, arranges multivalued information sequence calibration information in which four “0” are added before and after each value, and a user of an arbitrary multivalued information sequence. Information is recorded, and the reproduced signal of each information has a waveform as shown in FIG. The user information is various data such as music, images, documents, and the like represented by multi-value data. The reason why four “0” s are inserted before and after each value of 1 to 7 is to obtain a solitary wave waveform signal of each value of 1 to 7. First, data recording is performed based on the signal from the modulation circuit 6 based on the laser driving circuit 7.
Controls the laser light output from the optical head 3, arranges the values 1 to 7 on the optical disk 1, adds four “0” before and after each value, and adds the calibration information of the multi-value information sequence and the arbitrary information. And the user information of the multi-valued information sequence.

Next, in the data reproduction, the calibration information and the user information are reproduced from the optical disk 1 on which the data is recorded or the optical disk 1 on which the data is recorded by another device, and the reproduction signal is reproduced by the A / D converter 11. Is converted from an analog signal to a digital signal in a cycle shorter than the multi-valued data cycle, and is input to the first memory 12 and temporarily stored. The arithmetic control unit 17 obtains a maximum value (maximum value: peak value) on the reproduction signal of each multi-valued data of the calibration information stored in the first memory 12, and calculates a peak value X1 of each solitary wave of the calibration information. Determine. The interval between the peak values X1 is 5
A multi-level data cycle (recording cycle) is obtained by equally dividing.

Therefore, for example, in the solitary wave signal of the multilevel level 7 which is the largest solitary wave, the amplitude values of two data (X0, X2) separated from the peak value X1 by about the multivalued data period, respectively. The ratio between the peak value X1 and the peak value X1 is calculated by the calculation based on the above equation (1).
Initial values (α0, β) of the filter coefficients (waveform equalization coefficients)
0) is determined. F using the initial values (α0, β0)
Other signal data of the calibration information is input to the IR filter 14, and the output of the FIR filter 14 is input to the second memory 15 and temporarily stored.

In the signal data on the second memory 15, the arithmetic control unit 17 sets the amplitude value of two data (X0, X2) separated from the peak value X1 of each solitary wave by a multi-value data period to "0". Is determined to be within a predetermined range centered on "". If it does not fall within the predetermined range, the initial values (α0, β0) of the filter coefficients are changed, and the signal data of the calibration information in the first memory 12 is again input to the FIR filter 14 for filtering. This filter processing and filter coefficient determination processing are repeated to obtain the peak value X1 of each solitary wave.
Data (X0, X0)
The filter coefficient (α, β) is determined so that the amplitude value in 2) falls within a predetermined range centered on “0”. That is, 1
FIR filter coefficients for setting the respective amplitudes outside the recording cycle range, which are the ranges outside the respective values (X0, X2) before and after the respective peak values X1 of the solitary waves No. to No. 7, substantially to "0" are determined.

After determining the filter coefficient of the FIR filter 14, the arithmetic control unit 17 sets the filter coefficient in the FIR filter 14, performs a waveform equalization process on the user information signal data in the first memory 12, and performs the second memory 15
The multi-level determination unit 16 performs a predetermined determination, and outputs multi-level data based on the determination result. Here, the initial values (α0, β0) of the filter coefficients α and β are determined from the largest solitary wave, but the initial values (α
0, β0) and calculate the average value as the initial value (α0, β
0). In this manner, all types of solitary waves are recorded and reproduced, and the filter coefficients of the FIR filter 14 are repeatedly adjusted and determined so that the solitary waves are correctly equalized in waveform. And accurate waveform equalization processing can be performed.

(2) Second Embodiment (Claims 2, 12, 2)
Embodiments 2 and 31) In the second embodiment, when the optical disk device is an information recording / reproducing device, the optical head 3, the modulation circuit 6, the laser driving circuit 7 and the like are provided with one positive It functions as a multi-valued information sequence recording unit that records calibration information of a multi-valued information sequence obtained by adding a plurality of “0” before and after an integer value and user information of the multi-valued information sequence. Further, the optical head 3, the operational amplifier circuit 4, and the like function as a multi-level information sequence reproducing unit that reproduces the multi-level information sequence recorded by the multi-level information sequence recording unit. Further, the A / D converter 11, the first memory 12, the FIR filter 14, the second memory 15, the arithmetic control unit 17 and the like of the demodulation circuit 8 correct the calibration information reproduced by the multi-valued information sequence reproducing means. The maximum value of a reproduction signal of an integer value is determined, and a waveform or the like for determining a waveform equalization process that makes each amplitude outside the recording cycle range of the above values before and after the maximum value substantially “0” for the reproduction signal It fulfills the function of the conversion processing determining means.

Further, the FIR filter 14 and the like apply a waveform equalization based on the waveform equalization processing determined by the waveform equalization processing determination means to the reproduction signal of the user information reproduced by the multi-value information sequence reproduction means. It performs the function of waveform equalization processing means for performing processing. When the optical disk device is an information reproducing device, the optical head 3, the operational amplifier circuit 4, and the like are provided with a plurality of "0" s before and after one positive integer.
Performs the function of the multi-valued information sequence reproducing means for reproducing the multi-valued information sequence from a recording medium on which the calibration information of the multi-valued information sequence and the user information of the multi-valued information sequence are added. This is the same as the information recording / reproducing device. Further, the optical disc 1 recorded in the second embodiment or the optical disc 1 used for data reproduction is a multi-value information sequence obtained by adding a plurality of “0” before and after one positive integer. Information and user information of the multi-valued information sequence are recorded such that the calibration information is reproduced before the user information is reproduced (for example, the user information is recorded after the calibration information). It corresponds to a possible recording medium.

FIG. 8 is a signal waveform diagram of a multi-value information sequence of calibration information and user information used in the waveform equalization processing of the second embodiment. As shown in FIG.
Calibration information of a multivalued information sequence to which "0" is added and user information of an arbitrary multivalued information sequence are recorded, and a reproduction signal of each information has a waveform as shown in FIG. First, in data recording, a laser drive circuit 7 controls a laser beam output from the optical head 3 based on a signal from the modulation circuit 6, and adds four “0” before and after 7 to the optical disc 1. The calibration information of the multilevel information sequence and the user information of the arbitrary multilevel information sequence are recorded. Next, in the data reproduction, the time of each multi-value data is determined based on the time when the multi-value data period is constant in advance and the peak time of one solitary wave is used as a reference. Alternatively, a data pattern such as a multi-level data sequence “07070” may be additionally recorded, and the multi-level data cycle and its reference time may be determined from the reproduced waveform.

Optical disc 1 recorded by the above data recording
Alternatively, the calibration information and the user information are reproduced from the optical disc 1 on which the data is recorded by another device, and the A / D converter 11 converts the reproduced signal from an analog signal to a digital signal in a cycle shorter than a multi-value data cycle. Then, it is input to the first memory 12 and temporarily stored. Arithmetic control unit 17
Determines the peak value X1 on the reproduced signal of the multi-value data of the calibration information stored in the first memory 12, and determines the peak value X1 of the solitary wave of the calibration information. The two data (X0, X
The ratio between the amplitude value and the peak value X1 in 2) is calculated by the calculation based on the above equation 1, and the filter coefficient (α, β) of the FIR filter 14 is determined. That is, the FI for setting each amplitude outside the recording cycle range, which is a range outside the values (X0, X2) before and after the peak value X1 of the solitary wave of 7, to substantially “0”.
Determine the R filter coefficients.

After determining the filter coefficient of the FIR filter 14, the arithmetic control unit 17 sets the filter coefficient in the FIR filter 14, performs a waveform equalization process on the signal data of the user information in the first memory 12, and performs the second memory 15
The multi-level determination unit 16 performs a predetermined determination, and outputs multi-level data based on the determination result. In this way,
Only the solitary wave of multilevel level 7 is recorded in the calibration information, and if the linearity of the reproduced signal is good, the FI
Even if the filter coefficient of the R filter 14 is determined, the same effect as in the first embodiment can be obtained. In this manner, the filter coefficient of the FIR filter 14 is repeatedly adjusted and determined so that one isolated wave recorded on the optical disk 1 is subjected to the waveform equalization processing.
Calibration data to be recorded in the
More user information can be recorded on the optical disc 1.

(3) Third Embodiment (Claims 3, 13, and 2)
Third Embodiment) In the third embodiment, when the optical disk device is an information recording / reproducing device, the optical head 3, the modulation circuit 6, the laser drive circuit 7 and the like are provided on the recording medium from 1 to n-1. (N is an integer of 3 or more) and a front multi-valued information sequence obtained by adding a plurality of “0” before and after each value, and the above 1 to n−
It functions as a multi-level information sequence recording means for recording calibration information including a rear multi-level information sequence in which a plurality of values up to 1 are successively arranged in plurals and user information of the multi-level information sequence. Further, the optical head 3, the operational amplifier circuit 4, and the like function as a multi-level information sequence reproducing unit that reproduces the multi-level information sequence recorded by the multi-level information sequence recording unit.

Further, the A / D converter 1 of the demodulation circuit 8
1, the first memory 12, the FIR filter 14, the second memory 15, the arithmetic control unit 17 and the like are provided with respective values from 1 to n-1 of the front multi-valued information sequence reproduced by the multi-valued information sequence reproducing means. Of each of the reproduced signals, the amplitudes of the respective reproduced signals before and after the respective maximum values, which are outside the recording cycle range of the values, are set to approximately “0”, and the 1
To the respective maximum values after the processing for making the respective amplitudes substantially "0" to the respective reproduction signals from n to n-1 and a plurality of the respective values from 1 to n-1 of the rear multi-valued information sequence. It performs a function of a waveform equalization process determining means for determining a waveform equalization process for making the respective amplitudes substantially equal to “0” to each of the reproduced signals arranged in parallel, and for determining the waveform equalization process to substantially match the respective maximum values. Further, the FIR filter 14 and the like perform a waveform equalization process based on the waveform equalization process determined by the waveform equalization process determination unit on the reproduction signal of the user information reproduced by the multilevel information sequence reproduction unit. Performs the function of waveform equalization processing means.

When the optical disk device is an information reproducing device, the optical head 3 and the operational amplifier circuit 4 and the like arrange values from 1 to n-1 (n is an integer of 3 or more) and arrange each value. Calibration information consisting of a front multi-value information sequence in which a plurality of "0" s are added before and after and a rear multi-value information sequence in which a plurality of the values from 1 to n-1 are successively arranged. The function of the multi-valued information sequence reproducing means for reproducing the multi-valued information sequence from the recording medium on which the user information of the multi-valued information sequence is recorded is the same as that of the information recording / reproducing apparatus.

Further, the optical disk 1 recorded in the third embodiment or the optical disk 1 used for data reproduction is 1
To n-1 (n is an integer of 3 or more) and a front multi-valued information sequence obtained by adding a plurality of "0" before and after each value, Calibration information composed of a rear multi-value information sequence in which a plurality of values are successively arranged and user information of the multi-value information sequence are reproduced before the reproduction of the user information. (For example, user information is recorded after the calibration information).

FIG. 9 is a signal waveform diagram of a multi-value information sequence of calibration information and user information used in the waveform equalization processing of the third embodiment. As shown in FIG. 1, a front multi-value information sequence in which values 1 to 7 are arranged on the optical disc 1 and four “0” s are added before and after each value, and each value 1 to 7 Are recorded as calibration information consisting of a rear multi-value information sequence in which four are successively arranged, and user information of the multi-value information sequence, and a reproduced signal of each information has a waveform as shown in FIG. That is, multi-level data (step waveform) of four multi-levels 1 to 7 consecutive to the calibration information shown in FIG. 7 are additionally recorded. First, in the data recording, the laser drive circuit 7 controls the laser light output from the optical head 3 based on the signal from the modulation circuit 6, and arranges the values 1 to 7 on the optical disc 1 and places 4 before and after each value. Calibration information and a multi-valued information sequence consisting of a front multi-valued information sequence obtained by adding "0" and a rear multi-valued information sequence obtained by sequentially arranging four values each of 1 to 7 respectively. Record user information.

Next, in the same manner as in the first embodiment, the data is reproduced by the arithmetic and control unit 17 when the multilevel level 1 to the multilevel level 1 of the front multilevel information sequence is reached.
7 from the solitary wave, the initial values of the FIR filter 14 (α0, β
0) is determined, and the signal data of the calibration information is subjected to waveform equalization processing by the FIR filter 14. Further, in the signal data after the processing, the amplitude values of two data (X0, X2) at a time separated from the peak value X1 of each solitary wave by the multi-value data period are within a predetermined range centering on "0". Judge whether it is in or not. Further, multi-value data 1 to 1 of the front multi-value information sequence
7 before the processing of the solitary waves corresponding to the peak values X1 to X7 before the processing, respectively, and the multivalued data “1111” to “7777” of the rear multilevel information sequence before the processing. Values CX1 ′ to CX after processing of each multi-value data on the staircase waveform corresponding to the peak values CX1 to CX7 of FIG.
7 '. Then, it is also determined whether or not each of the values D1 to D7 falls within a predetermined range centered on “0” by the arithmetic processing based on the following Expression 2.

[0064]

## EQU2 ## D1 = X1'-CX1 'D2 = X2'-CX2' D3 = X3'-CX3 'D4 = X4'-CX4' D5 = X5'-CX5 'D6 = X6'-CX6' D7 = X7 ' -CX7 '

That is, at each multi-valued level after processing,
It is determined whether or not the amplitude value of the solitary wave is close to the amplitude value of the continuous data. The two values separated by the multi-value data period from the peak of each solitary wave in the front multi-value information sequence are within a predetermined range centered on “0”; The filter coefficients (α, α,
β) is determined.

That is, the peak of the reproduction signal of each value from 1 to 7 of the front multi-value information sequence is obtained, and the amplitude of each value outside the recording cycle range of each value before and after each peak is obtained for each reproduction signal. Each peak after the process of making each of the reproduced signals 1 to 7 of the front multi-level information sequence to be substantially “0” and performing the process of setting each amplitude to substantially “0”, and 1 to 7 of the rear multi-level information sequence A waveform equalization process is performed to substantially match the respective maximum values after performing the process of setting the amplitudes to approximately "0" to the respective reproduction signals sequentially arranged by four in each of the above. In this way, a filter coefficient that further enhances the effect of the FIR filter 14 for waveform equalization can be determined. In this manner, the solitary wave is correctly waveform-equalized using a staircase waveform in which all types of solitary waves and each multi-valued data are continuous, and the amplitude of the staircase waveform and the peak value of the solitary wave approach each other. Since the filter coefficient of the FIR filter 14 is repeatedly adjusted, the accuracy of the waveform equalization processing can be further improved.

Next, an embodiment of the linearization processing according to the present invention will be described. When the waveform equalization processing is determined, if the linearization processing is performed before performing the waveform equalization on the reproduction signal of the calibration information, the waveform equalization coefficient can be set with high accuracy. Further, if the linearization process is not performed by a fixed function process but is determined based on the calibration information, the process can be optimized according to the characteristics of the optical disk or the optical disk device. Therefore, a correction table 13 for performing a linearization process on the reproduced signal of the multi-value information sequence is provided, and a linearization process (correction function process) in the correction table 13 is determined and set before the waveform equalization process.

(4) Fourth Embodiment (Claims 4, 5, 14,
Embodiments relating to 15, 24, and 25) In the fourth embodiment, the A / D converter 11 of the demodulation circuit 8 and the first memory are used regardless of whether the optical disk device is an information recording / reproducing device or an information reproducing device. 12, the correction table 13, the arithmetic control unit 17 and the like are arranged so that the change in the maximum value of the reproduced signal of each value from 1 to n-1 of the calibration information reproduced by the multi-valued information sequence reproducing means is linearized. The function of the correction function processing determining means for determining the correction function processing for correcting the amplitude value of each reproduction signal is performed. Further, the correction table 13 or the like is a correction function processing unit that performs a correction function process based on the correction function process determined by the correction function process determination unit on the reproduction signal of the user information reproduced by the multi-value information sequence reproduction unit. Perform the function of

FIG. 10 is a diagram for explaining the linearization processing of the fourth embodiment. The arithmetic control unit 17 calculates the peak values X1 to X1 of the solitary waves in the calibration information of the reproduced signal shown in FIG.
A correction function process for setting X7 at equal intervals Z1 to Z7 is determined. For example, the following coordinate points (X1, X1, X2) corresponding to the values obtained from the reproduction signal data and the correction values.
Z1) (X2, Z2) (X3, Z3) (X4, Z4)
A correction function process is determined by approximating (X5, Z5) (X6, Z6) (X7, Z7) with a higher-order function. That is, a correction function process for correcting the amplitude value of each reproduced signal is determined so that the change in the peak of the reproduced signal of each value from 1 to 7 of the calibration information is linearized. Further, as shown in FIG. 10, linear interpolation may be performed between each point by a linear function process in order to simplify the calculation process of the correction function process. Thus, the amplitude of each solitary wave of the calibration information can be linearized.

The correction function processing can be realized by table conversion using a memory. For example, the A / D converter 11 is set to 8
When using bits, a memory having 8-bit addresses and data for the correction table 13 is used. The value at that address is stored as the amplitude value before correction, and the correction value corresponding to that value is stored as data. Thereafter, when the AD-converted data is input to the memory address of the correction table 13, a correction value is obtained as output data of the memory. Arithmetic control unit 1
7 sets the determined correction function processing in the correction table 13, inputs the reproduction signal of the calibration information stored in the first memory 12 to the correction table 13, and performs the correction function processing based on the determined correction function processing. Then, the waveform equalization coefficient of the above-described waveform equalization processing is determined, and the reproduction signal of the user information stored in the first memory 12 is output from the multi-value determination unit 16 via the correction table 13 and the FIR filter 14 to output multi-value data. I do.

As described above, the peak values of all kinds of solitary waves are corrected so as to be at equal intervals.
The intervals between the multi-level levels become constant, and a good linearization process can be performed. Further, since the linear function processing is used for the correction function processing, the correction operation processing can be simplified, which is suitable for speeding up the processing and miniaturizing the circuit.

(5) Fifth Embodiment (Claims 6, 9, 10,
16, 19, 20, 26, 29, 30) In the fifth embodiment, the A / D conversion of the demodulation circuit 8 is performed regardless of whether the optical disk device is an information recording / reproducing device or an information reproducing device. The unit 11, the first memory 12, the correction table 13, the arithmetic control unit 17 and the like determine a reproduction signal of each value from 1 to n-1 of the front multi-valued information sequence in each recording cycle of each value. The respective superimposed signals superimposed by being shifted by a number are obtained, and the median value of each superimposed signal and each of the reproduced signals obtained by continuously arranging a plurality of each of the rear multi-valued information sequence from 1 to n-1 are obtained. The function of the correction function processing determining means for determining the correction function processing for correcting the amplitude value of each of the reproduction signals so that the amplitude values substantially match each other is performed. Further, the correction table 13 or the like is a correction function processing unit that performs a correction function process based on the correction function process determined by the correction function process determination unit on the reproduction signal of the user information reproduced by the multi-value information sequence reproduction unit. Perform the function of

FIG. 11 is a waveform chart for explaining the calculation processing of the superimposed waveform. In the above-described fourth embodiment, the linearization processing of the amplitude value up to the peak value X7 of the solitary wave of the multi-level level 7 in the calibration information was performed. I do. For this purpose, a reproduced signal shown in FIG. 9 is used. This reproduced signal is represented by A
AD conversion is performed by the / D conversion unit 11, the digital data is stored in the first memory 12, and the arithmetic control unit 17 extracts the waveform data of each isolated wave. For example, waveform data in a range where the amplitude values of the data at both ends of the peak value X1 of the multilevel level 1 solitary wave are substantially “0” is extracted, and as shown in FIG. Each of them is shifted by four and added to calculate a superimposed waveform of an isolated wave as shown by a broken line in the figure. The median value of the superposed waveform of the solitary wave is S
X1. Here, if the reproduced signal has linearity, the median value SX1 and the amplitude value CX1 of the staircase waveform in FIG.
Although there is a slight difference due to the influence of noise, they are almost the same.

In the same manner as described above, the other multi-level solitary waves are also shifted by four and added, and the median value SX
2 to SX7 are calculated. FIG. 12 is a diagram provided for describing the linearization processing according to the fifth embodiment. Here, as an example, a case where the amplitude values CX6 and CX7 exceed the peak value X7 will be described. As shown in FIG.
Corresponds to the amplitude values CX6 and CX7 of the staircase waveform in the calibration information as the correction function process for the linearization process in the amplitude region exceeding the peak value X7, respectively, to the amplitude values SX6 and SX7 of the superimposed waveform of the solitary wave. (CX6, SX6) (CX7, SX7) (X7, Z7)
A correction function process that approximates the three points by an arbitrary function is determined.

That is, each superimposed signal is obtained by superimposing the reproduced signals of each value of 1 to 7 of the front multi-value information sequence by shifting them by a predetermined number in each recording cycle of each value, and obtaining each superimposed signal. And a correction function process for correcting the amplitude value of each reproduction signal such that the amplitude value of each of the reproduction signals successively arranged by four of each of 1 to 7 of the rear multi-value information sequence substantially coincides with each other. To determine. Further, in order to simplify the calculation processing of the correction function processing, interpolation between three points may be performed by a linear function processing. Or 2 passing through 3 points
The interpolation function processing may be performed by the following function processing.

Then, the correction function processing shown in FIG.
By combining with the correction function processing shown in FIG. 10, all the correction function processing for the linearization processing can be performed. Since the reproduced signal in FIG. 9 also includes each solitary wave, the first signal
The waveform equalization of the embodiment and the linearization processing of the fourth embodiment can also be performed. In this way, the arithmetic control unit 17 sets the determined correction function processing in the correction table 13 and inputs the reproduction signal of the calibration information stored in the first memory 12 to the correction table 13 based on the determined correction function processing. The correction function processing is performed to determine the waveform equalization coefficient of the above-described waveform equalization processing, and the reproduction signal of the user information stored in the first memory 12 is transmitted from the multi-value determination unit 16 via the correction table 13 and the FIR filter 14. Output multi-valued data.

As described above, using a staircase waveform in which all kinds of solitary waves and each multi-valued data are continuous, a correction is made so that the amplitude obtained by shifting and adding a plurality of solitary waves and the amplitude of the continuous data are matched. Is performed, linearization processing can be performed in an amplitude region exceeding the maximum amplitude of the solitary wave. Further, if the linear function processing is used for the correction function processing, the correction operation is simplified, which is suitable for speeding up the processing and miniaturizing the circuit. Further, if a second or higher order function process is used for the correction function process, the accuracy of the correction is improved.

Next, an embodiment of the linear correction processing and the waveform equalization processing according to the present invention will be described. (6) Sixth embodiment (Claims 7, 9, 10, 17, 19,
In the sixth embodiment, when the optical disk device is an information recording / reproducing device, the optical head 3, modulation circuit 6, laser drive circuit 7, etc. Calibration information consisting of a front multi-value information sequence in which a plurality of "0" s are added before and after the number of positive integer values and a rear multi-value information sequence in which a plurality of the positive integer values are successively arranged. And a function of a multi-valued information sequence recording means for recording the user information of the multi-valued information sequence. Further, the optical head 3, the operational amplifier circuit 4, and the like function as a multi-level information sequence reproducing unit that reproduces the multi-level information sequence recorded by the multi-level information sequence recording unit.

Further, the A / D converter 1 of the demodulation circuit 8
1, the first memory 12, the correction table 13, the arithmetic control unit 17, and the like record the reproduced signal of the positive integer of the front multi-valued information sequence reproduced by the multi-valued information sequence reproducing means into the respective values. A superimposed signal obtained by superimposing by a predetermined number every period is superimposed, and a median value of the superimposed signal and an amplitude value of a reproduced signal obtained by continuously arranging a plurality of positive integer values of the rear multi-valued information sequence in succession are obtained. The function of the correction function processing determining means for determining the correction function processing for correcting the amplitude value of the reproduction signal so as to substantially match.

The A / D converter 1 of the demodulation circuit 8
1, the first memory 12, the FIR filter 14, the second memory 15, the arithmetic control unit 17 and the like perform the correction function processing determined by the correction function processing determining means, and perform the correction function processing. And performs a function of waveform equalization determining means for determining a waveform equalization process for setting the respective amplitudes outside the recording cycle range of the above values before and after the maximum value to substantially zero for the reproduced signal. .

Further, the correction table 13 and the like provide a correction function for applying a correction function process based on the correction function process determined by the correction function process determination unit to the reproduction signal of the user information reproduced by the multi-value information sequence reproduction unit. Performs the function of function processing means. Furthermore, the FIR filter 14 or the like performs a waveform equalization process based on the waveform equalization process determined by the waveform equalization process determination unit on the reproduced signal subjected to the correction function process by the correction function processing unit. Performs the function of equalization processing means.

When the optical disk apparatus is an information reproducing apparatus, the optical head 3, the operational amplifier circuit 4, etc., have a front part obtained by adding a plurality of "0" before and after one positive integer. The multi-value information sequence is reproduced from a recording medium in which calibration information including a multi-value information sequence and a rear multi-value information sequence in which a plurality of the positive integer values are continuously arranged and user information of the multi-value information sequence are recorded. The other functions are the same as those of the information recording / reproducing apparatus.

Further, the optical disk 1 recorded in the first embodiment or the optical disk 1 used for data reproduction is 1
Calibration information consisting of a front multi-value information sequence in which a plurality of "0" s are added before and after the number of positive integer values, and a rear multi-value information sequence in which a plurality of the positive integer values are successively arranged. And the user information of the multi-value information sequence are recorded such that the calibration information is reproduced first before the reproduction of the user information (for example, the user information is recorded after the calibration information). It corresponds to a simple recording medium.

In the fifth embodiment, seven solitary waves and staircase waveforms are recorded in the calibration information. In the sixth embodiment, linearization in an amplitude region exceeding the maximum solitary wave peak value X7 is more easily performed. Perform processing. FIG. 13 is a signal waveform diagram of a multilevel information sequence of calibration information and user information used in the sixth embodiment. FIG.
FIG. 4 is a diagram for describing a linearization process according to the sixth embodiment. As shown in FIG. 13, the optical disc 1 has a front multi-value information sequence in which four “0” s are added before and after a maximum multi-value level 7 and a rear portion in which four multi-value levels 7 are continuously arranged. Calibration information composed of a multi-valued information sequence and user information of the multi-valued information sequence are recorded, and a reproduced signal of each information has a waveform as shown in FIG.

First, in the data recording, the laser drive circuit 7 controls the laser beam output from the optical head 3 based on the signal from the modulation circuit 6, and outputs two “0” before 7 and four laser light after 7. Calibration information consisting of a front multi-value information sequence to which "0" is added and a rear multi-value information sequence in which four 7s are consecutively arranged and user information of the multi-value information sequence are recorded. Next, data playback
The calibration information and the user information are reproduced from the optical disk 1 on which the data is recorded by the optical disk 1 recorded by the data recording or another device, and the reproduced signal is converted by the A / D converter 11 into a cycle shorter than the multi-value data cycle. A / D conversion from an analog signal to a digital signal is performed, and is input to the first memory 12 and temporarily stored. Then, in the same manner as in the fifth embodiment, the waveform data in the range where the amplitude value of the data at both ends of the peak value X1 of the solitary wave is substantially "0" is extracted, and the waveform data is shifted by the multi-value data period to obtain four waveform data. The addition is performed to calculate a superimposed waveform of the solitary waves. The amplitude value is set to SX7, and as shown in FIG.
X7) A correction function process that approximates (CX7, SX7) with an arbitrary function is determined.

That is, a superimposed signal is obtained by superimposing the 7 reproduced signals of the front multi-value information sequence by shifting them by four every recording cycle of each value, and obtaining the superimposed signal and the median value of the superimposed signal and the rear multi-value information sequence. A correction function process for correcting the amplitude value of the reproduced signal is determined so that the amplitude value of the reproduced signal obtained by arranging four of the above 7 substantially coincides with each other. Further, in order to simplify the calculation processing of the correction function processing, interpolation between three points may be performed by a linear function processing. Alternatively, the interpolation function processing may be performed by a second or higher-order function processing passing three points.

The arithmetic control unit 17 sets the determined correction function processing in the correction table 13, inputs the reproduction signal of the calibration information stored in the first memory 12 to the correction table 13, , And based on the calibration information data after the correction function processing, the waveform equalization coefficient of the waveform equalization processing is determined in the same manner as in the second embodiment, and stored in the first memory 12. The reproduction signal of the user information is output from the multi-value determination unit 16 through the correction table 13 and the FIR filter 14 to output multi-value data.

As described above, using one maximum isolated wave and its continuous waveform, the correction is performed so that the amplitude obtained by shifting and adding a plurality of isolated waves and the amplitude of the continuous data corresponding thereto are made to match. Therefore, linearization processing can be performed in an amplitude region exceeding the maximum amplitude of the solitary wave, data of calibration information to be recorded on the optical disc 1 can be reduced, and more information can be recorded on the optical disc 1. Further, if the linear function processing is used for the correction function processing, the correction operation is simplified, which is suitable for speeding up the processing and miniaturizing the circuit. Further, if a second or higher order function process is used for the correction function process, the accuracy of the correction is improved.

(7) Seventh Embodiment (Claims 8, 9, 10,
18, 19, 20, 28, 29, 30, 34) In the seventh embodiment, when the optical disk device is an information recording / reproducing device, the optical head 3, the modulation circuit 6, the laser drive circuit 7, etc. Is obtained by arranging a plurality of types of positive integers on a recording medium and adding a plurality of zeros to the synchronization information of a multi-valued information sequence, and a plurality of zeros before and after the positive integers. It functions as a multi-valued information sequence recording unit that records the calibration information of the multi-valued information sequence and the user information of the multi-valued information sequence. Further, the optical head 3, the operational amplifier circuit 4, and the like function as a multi-level information sequence reproducing unit that reproduces the multi-level information sequence recorded by the multi-level information sequence recording unit.

Further, the A / D converter 1 of the demodulation circuit 8
1, the first memory 12, the correction table 13, the arithmetic control unit 17 and the like record the reproduced signal of the positive integer of the front multi-valued information sequence reproduced by the multi-valued information sequence reproducing means into the respective values. A superimposed signal obtained by superimposing by a predetermined number every period is superimposed, and a median value of the superimposed signal substantially coincides with an amplitude value of a reproduced signal obtained by continuously arranging a plurality of positive integer values of the synchronization information. Thus, the function of the correction function processing determining means for determining the correction function processing for correcting the amplitude value of the reproduction signal is performed.

The A / D converter 1 of the demodulation circuit 8
1, the first memory 12, the FIR filter 14, the second memory 15, the arithmetic control unit 17 and the like perform the correction function processing determined by the correction function processing determining means, and perform the correction function processing. And performs a function of waveform equalization determining means for determining a waveform equalization process for setting the respective amplitudes outside the recording cycle range of the above values before and after the maximum value to substantially zero for the reproduced signal. . Further, the correction table 13 or the like is a correction function processing unit that performs a correction function process based on the correction function process determined by the correction function process determination unit on the reproduction signal of the user information reproduced by the multi-value information sequence reproduction unit. Perform the function of Furthermore, the FIR filter 14 or the like performs a waveform equalization process based on the waveform equalization process determined by the waveform equalization process determination unit on the reproduced signal subjected to the correction function process by the correction function processing unit. Performs the function of equalization processing means.

When the optical disk device is an information reproducing device, a plurality of 0s are arranged by arranging a plurality of one type of positive integer.
Recording that records the synchronization information of the multi-valued information sequence obtained by adding the multi-valued information sequence, the calibration information of the multi-valued information sequence obtained by adding a plurality of zeros before and after the positive integer value, and the user information of the multi-valued information sequence The function of the multi-value information sequence reproducing means for reproducing the multi-value information sequence from the medium is achieved, and the other functions are the same as those of the information recording / reproducing apparatus. Further, the optical disk 1 recorded in the seventh embodiment
Alternatively, the optical disc 1 used for data reproduction has a multi-value information sequence synchronization information obtained by arranging a plurality of positive integer values of one kind and adding a plurality of 0s, and a plurality of 0s before and after the positive integer values.
The calibration information of the multi-valued information sequence and the user information of the multi-valued information sequence are recorded such that the calibration information is reproduced first before the reproduction of the user information (for example, synchronization). Information, calibration information, and user information in this order).

FIG. 15 is a signal waveform diagram of a multilevel information sequence of a synchronization signal, calibration information, and user information used in the seventh embodiment. In the sixth embodiment, four consecutive maximum multi-value levels 7 are recorded in the calibration information continuously. However, in the seventh embodiment, a synchronization signal (synchronization information) "0000777" which is a delimiter of a predetermined amount of information.
A multi-value data string of 77 "is recorded, and thereafter, calibration information of the multi-value information string and user information of the multi-value information string obtained by adding four 0s before and after 7 are recorded. The reproduced signal has a waveform as shown in FIG.

First, data recording is performed by controlling the laser light output from the optical head 3 by the laser drive circuit 7 based on the signal from the modulation circuit 6 and arranging four 7s and adding four 0s. The synchronization information of the value information sequence and the calibration information of the multi-value information sequence obtained by adding four 0s before and after 7 and the user information of the multi-value information sequence are recorded. Next, in the data reproduction, a synchronization signal, calibration information, and user information are reproduced from the optical disk 1 on which the data is recorded or the optical disk 1 on which the data is recorded by another device. Is converted from an analog signal to a digital signal in a cycle shorter than the multi-valued data cycle, and is input to the first memory 12 and temporarily stored. Then, the synchronization signal “77”
77 "is used to determine the correction function processing for linearization processing in the same manner as in the sixth embodiment. The following processing is the same as in the sixth embodiment, and a description thereof will be omitted. The waveform equalization processing of the second embodiment can also be performed using the reproduced signal shown.

As described above, since one maximum solitary wave is recorded in the calibration information and its continuous waveform is used as a synchronous pattern, linearization processing can be performed in an amplitude region exceeding the maximum amplitude of the solitary wave, and The data of the calibration information recorded on the optical disc 1 can be reduced, and more information can be recorded on the optical disc 1. Further, if the linear function processing is used for the correction function processing, the correction operation is simplified, which is suitable for speeding up the processing and miniaturizing the circuit. Further, if a second or higher order function process is used for the correction function process, the accuracy of the correction is improved.

[0096]

As described above, according to the information recording / reproducing apparatus, the information reproducing apparatus, the information recording / reproducing method and the computer-readable recording medium of the present invention, a multi-valued information sequence is recorded on a recording medium such as an optical disk. When recorded at high density, the recorded multi-valued information sequence can be reproduced with high accuracy.

[Brief description of the drawings]

FIG. 1 is a functional block diagram showing a configuration of an optical disk device according to an embodiment of the present invention.

FIG. 2 is a functional block diagram showing an internal configuration of a demodulation circuit 8 shown in FIG.

FIG. 3 is a diagram showing an example of a mark shape when each of eight-value data is recorded on an optical disc.

FIG. 4 is a waveform diagram showing an example of a solitary wave of a reproduced signal when each mark shown in FIG. 3 is recorded alone on the optical disc 1;

FIG. 5 is a diagram provided for describing a waveform equalization process performed on multi-value data.

FIG. 6 is a block diagram showing an internal configuration of the FIR filter 14 shown in FIG.

FIG. 7 is a signal waveform diagram of a multi-value information sequence of calibration information and user information used in the waveform equalization processing of the first embodiment.

FIG. 8 is a signal waveform diagram of a multi-value information sequence of calibration information and user information used for the waveform equalization processing of the second embodiment.

FIG. 9 is a signal waveform diagram of a multi-value information sequence of calibration information and user information used in the waveform equalization processing of the third embodiment.

FIG. 10 is a diagram for describing a linearization process according to a fourth embodiment;

FIG. 11 is a waveform chart for explaining a calculation process of a superimposed waveform;

FIG. 12 is a diagram for describing a linearization process according to a fifth embodiment;

FIG. 13 is a signal waveform diagram of a multi-value information sequence of calibration information and user information used in the sixth embodiment.

FIG. 14 is a diagram for describing a linearization process according to a sixth embodiment;

FIG. 15 is a signal waveform diagram of a multilevel information sequence of a synchronization signal, calibration information, and user information used in the seventh embodiment.

[Explanation of symbols]

 1: optical disc 2: spindle motor 3: optical head 4: operational amplifier circuit 5: servo circuit 6: modulation circuit 7: laser drive circuit 8: demodulation circuit 11: A / D converter 12: first memory 13: correction table 14 : FIR filter 15: second memory 16: multi-value determination unit 17: operation control unit 20 to 22: first to third delay circuits 23: first multiplier 24: second multiplier 25: adder

Claims (34)

[Claims] 1. A method in which values from 1 to n-1 (n is an integer of 3 or more) are arranged on a recording medium, and a plurality of 0s are arranged before and after each value.
Multi-value information sequence recording means for recording the multi-value information sequence calibration information and the multi-value information sequence user information to which the multi-value information sequence is added; A multi-level information sequence reproducing unit; and one of the calibration information reproduced by the multi-level information sequence reproducing unit.
Waveform equalization processing for obtaining the maximum value of the reproduction signal of each value from n to n-1 and making each amplitude of each reproduction signal before and after the maximum value outside the recording cycle range substantially zero. And a waveform equalization process based on the waveform equalization process determined by the waveform equalization process determination unit on the reproduction signal of the user information reproduced by the multi-value information sequence reproduction unit. An information recording / reproducing apparatus, comprising: a waveform equalization processing unit for applying the information. 2. A multi-value information sequence for recording calibration information of a multi-value information sequence obtained by adding a plurality of zeros before and after one positive integer value to a recording medium and user information of the multi-value information sequence. Recording means; multi-valued information string reproducing means for reproducing the multi-valued information sequence recorded by the multi-valued information sequence recording means; reproduction of a positive integer value of the calibration information reproduced by the multi-valued information sequence reproducing means A waveform equalization process determining unit that determines a maximum value of the signal, and determines a waveform equalization process that sets each amplitude outside the recording cycle range of each of the values before and after the maximum value to substantially zero for the reproduced signal; Waveform equalization processing means for performing waveform equalization processing based on the waveform equalization processing determined by the waveform equalization processing determination means on the reproduction signal of the user information reproduced by the multi-value information sequence reproduction means. Characteristic information recording / reproducing device. 3. A recording medium in which values from 1 to n-1 (n is an integer of 3 or more) are arranged, and a plurality of 0's are arranged before and after each value.
And multi-value information sequence user information of a multi-value information sequence consisting of a front multi-value information sequence obtained by adding a plurality of values and a rear multi-value information sequence obtained by successively arranging a plurality of the respective values from 1 to n-1. A multi-valued information sequence recording means for recording the multi-valued information sequence recorded by the multi-valued information sequence recording device; a multi-valued information sequence reproducing device for reproducing the multi-valued information sequence recorded by the multi-valued information sequence recording device; The maximum value of the reproduction signal of each value from 1 to n-1 in the partial multi-valued information sequence is obtained, and the amplitude of each reproduction signal outside the recording cycle range before and after the maximum value is approximately calculated. 0, the maximum value after performing the process of making each of the reproduced signals from 1 to n-1 of the front multi-valued information sequence to make the respective amplitudes substantially zero, and 1 to n of the rear multi-valued information sequence. Each of the amplitudes is made substantially zero for each of the reproduced signals that are successively arranged in plurals up to −1. Waveform equalization processing determining means for determining a waveform equalization processing for making the respective maximum values substantially equal to each other after the processing is performed, and the waveform and the like in the reproduction signal of the user information reproduced by the multi-value information sequence reproducing means. An information recording / reproducing apparatus comprising: a waveform equalization processing unit that performs a waveform equalization process based on the waveform equalization process determined by the equalization process determination unit. 4. The information recording / reproducing apparatus according to claim 1, wherein the change of the maximum value of the reproduction signal of each value from 1 to n-1 of the calibration information reproduced by the multi-value information sequence reproducing means is linearized. Correction function processing determining means for determining a correction function processing for correcting the amplitude value of each of the reproduced signals so that the reproduced signal of the user information reproduced by the multi-value information sequence reproducing means is corrected by the correction function processing determining means An information recording / reproducing apparatus, comprising: a correction function processing means for performing a correction function process based on the determined correction function process. 5. The information recording / reproducing apparatus according to claim 4, wherein the correction function processing is a linear function processing. 6. The information recording / reproducing apparatus according to claim 3, wherein the reproduction signal of each value from 1 to n-1 of the front multi-value information sequence is shifted by a predetermined number for each recording cycle of each value. The superimposed signals are obtained, and the median value of each superimposed signal and the amplitude value of each of the reproduced signals continuously arranged in plurals from 1 to n-1 of the rear multi-valued information sequence are obtained. Correction function processing determining means for determining a correction function processing for correcting the amplitude value of each of the reproduced signals so as to substantially match each other; and An information recording / reproducing apparatus comprising: a correction function processing unit that performs a correction function process based on the correction function process determined by the determination unit. 7. A multivalued information sequence in which a plurality of zeros are added before and after one positive integer value on a recording medium, and a rear multivalued information sequence in which a plurality of the positive integer values are continuously arranged. A multi-valued information sequence recording means for recording calibration information comprising an information sequence and user information of the multi-valued information sequence, and a multi-valued information sequence reproduction for reproducing the multi-valued information sequence recorded by the multi-valued information sequence recording means Means for obtaining a superimposed signal obtained by superimposing a reproduced signal of a positive integer value of said front multi-valued information sequence reproduced by said multi-valued information sequence reproducing device by a predetermined number for each recording cycle of said values. ,
A correction function for correcting the amplitude value of the reproduced signal so that the median value of the superimposed signal and the amplitude value of the reproduced signal formed by continuously arranging a plurality of positive integer values of the rear multi-valued information sequence are substantially the same. Correction function processing determining means for determining a process; and obtaining a maximum value of a positive integer reproduction signal of the calibration information subjected to the correction function processing determined by the correction function processing determining means. A waveform equalization process determining unit that determines a waveform equalization process that makes each amplitude outside the recording cycle range of each value before and after the maximum value substantially zero; and a user information reproduced by the multi-value information sequence reproducing unit. Correction function processing means for applying a correction function processing to the reproduction signal based on the correction function processing determined by the correction function processing determination means; and a waveform or the like for the reproduction signal subjected to the correction function processing by the correction function processing means. Information recording and reproducing apparatus characterized by comprising a waveform equalization processing means for performing waveform equalization processing based on the determined waveform equalizing process by the processing determining means. 8. A synchronous information of a multi-value information sequence obtained by arranging a plurality of types of positive integers on a recording medium and adding a plurality of zeros, and adding a plurality of zeros before and after the positive integers. Multi-value information sequence recording means for recording calibration information of a multi-value information sequence and user information of a multi-value information sequence, and a multi-value information reproducing the multi-value information sequence recorded by the multi-value information sequence recording means An information sequence reproducing means, and a superimposition in which reproduced signals of positive integer values of the front multi-valued information sequence reproduced by the multi-valued information sequence reproducing device are shifted by a predetermined number for each recording cycle of the respective values. Find the signal,
A correction function process for correcting the amplitude value of the reproduced signal is determined so that the median value of the superimposed signal and the amplitude value of the reproduced signal obtained by successively arranging a plurality of positive integer values of the synchronization information are substantially the same. Correction function processing determining means for performing the correction function processing determined by the correction function processing determining means, to determine the maximum value of the positive integer reproduction signal of the calibration information, Waveform equalization processing determining means for determining waveform equalization processing for making each amplitude before and after the value outside the recording cycle range substantially zero; and a reproduction signal of user information reproduced by the multi-value information sequence reproducing means. Correction function processing means for performing a correction function processing based on the correction function processing determined by the correction function processing determination means; and the waveform equalization processing on the reproduced signal subjected to the correction function processing by the correction function processing means Information recording and reproducing apparatus characterized by comprising a waveform equalization processing means for performing waveform equalization processing based on the determined waveform equalizing process by a constant means. 9. The information recording and reproducing apparatus according to claim 6, wherein the correction function processing is a linear function processing. 10. The information recording / reproducing apparatus according to claim 6, wherein the correction function processing is a second-order or higher-order function processing. 11. 1 to n-1 (n is an integer of 3 or more)
The multi-valued information sequence is reproduced from a recording medium in which the calibration information of the multi-valued information sequence and the user information of the multi-valued information sequence in which a plurality of zeros are added before and after each value are arranged. A multi-level information sequence reproducing unit, and one of calibration information reproduced by the multi-level information sequence reproducing unit.
Waveform equalization processing for obtaining the maximum value of the reproduction signal of each value from n to n-1 and making each amplitude outside the recording cycle range of each value before and after the maximum value of each reproduction signal substantially zero. And a waveform equalization process based on the waveform equalization process determined by the waveform equalization process determination unit on the reproduction signal of the user information reproduced by the multi-value information sequence reproduction unit. An information reproducing apparatus, comprising: a waveform equalization processing unit for applying the information. 12. A plurality of zeros before and after one positive integer value.
A multi-valued information sequence reproducing means for reproducing the multi-valued information sequence from a recording medium on which the calibration information of the multi-valued information sequence and the user information of the multi-valued information sequence are added; Waveform equalization for obtaining the maximum value of a reproduction signal of a positive integer value of the calibration information reproduced by the method, and making each amplitude of the reproduction signal before and after the maximum value outside the recording cycle range of the value substantially zero. Waveform equalization processing determining means for determining processing; and waveform equalization processing based on the waveform equalization processing determined by the waveform equalization processing determination means on a reproduced signal of user information reproduced by the multi-valued information sequence reproducing means. An information reproducing apparatus, comprising: a waveform equalization processing means for performing the following. 13. 1 to n-1 (n is an integer of 3 or more)
And a multivalued information sequence in which a plurality of zeros are added before and after each value, and a multivalued information sequence in which each of the values from 1 to n-1 is continuously arranged in plural numbers. A multi-valued information sequence reproducing means for reproducing the multi-valued information sequence from a recording medium on which the calibration information comprising the information sequence and the user information of the multi-valued information sequence are recorded; The maximum value of the reproduction signal of each value from 1 to n-1 in the partial multi-valued information sequence is obtained, and the amplitude of each reproduction signal outside the recording cycle range before and after the maximum value is approximately calculated. 0, the maximum value after performing the process of making each of the reproduced signals from 1 to n-1 of the front multi-valued information sequence to make the respective amplitudes substantially zero, and 1 to n of the rear multi-valued information sequence. A process of making the amplitudes substantially equal to 0 for each of a plurality of reproduction signals successively arranged up to -1 Waveform equalization processing determining means for determining a waveform equalization process for substantially matching each maximum value after performing the above, and the waveform equalization to a reproduction signal of user information reproduced by the multi-value information sequence reproduction means. An information reproducing apparatus comprising: a waveform equalization processing unit that performs a waveform equalization process based on the waveform equalization process determined by the process determination unit. 14. The information reproducing apparatus according to claim 11, wherein the change of the maximum value of the reproduction signal of each value from 1 to n-1 of the calibration information reproduced by the multi-level information sequence reproducing unit is linearized. Correction function processing determining means for determining a correction function processing for correcting the amplitude value of each of the reproduction signals, and determining the correction function processing determination means for a reproduction signal of the user information reproduced by the multi-value information sequence reproduction means. And a correction function processing means for performing a correction function processing based on the corrected correction function processing. 15. The information reproducing apparatus according to claim 14, wherein the correction function processing is a linear function processing. 16. The information reproducing apparatus according to claim 13, wherein reproduced signals of respective values from 1 to n−1 of the front multi-valued information sequence are shifted by a predetermined number in each recording cycle of the respective values and are overlapped. The combined superimposed signal is obtained, and the median value of each superimposed signal and the amplitude value of each reproduced signal continuously arranged in plurals from 1 to n-1 of the rear multi-valued information sequence are respectively obtained. Correction function processing determining means for determining a correction function processing for correcting the amplitude value of each of the reproduction signals so as to substantially coincide with each other; and determining the correction function processing for the reproduction signal of the user information reproduced by the multi-value information sequence reproduction means. An information reproducing apparatus, comprising: amplitude correction means for performing a correction function processing based on the correction function processing determined by the means. 17. A method in which a number of 0s is added before and after one positive integer value.
From the recording medium in which the calibration information and the user information of the multivalued information sequence consisting of the front multivalued information sequence formed by adding the front multivalued information sequence and the rear multivalued information sequence formed by continuously arranging a plurality of the positive integer values are provided. A multi-valued information sequence reproducing means for reproducing the multi-valued information sequence; and a reproduction signal of a positive integer value of the front multi-valued information sequence reproduced by the multi-valued information sequence reproducing device for each recording cycle of each value. To obtain a superimposed signal superimposed by a predetermined number,
A correction function for correcting the amplitude value of the reproduced signal so that the median value of the superimposed signal and the amplitude value of the reproduced signal formed by continuously arranging a plurality of positive integer values of the rear multi-valued information sequence are substantially the same. Correction function processing determining means for determining a process; and obtaining a maximum value of a positive integer reproduction signal of the calibration information subjected to the correction function processing determined by the correction function processing determining means. A waveform equalization process determining unit that determines a waveform equalization process that makes each amplitude outside the recording cycle range of each value before and after the maximum value substantially zero; and a user information reproduced by the multi-value information sequence reproducing unit. Correction function processing means for applying a correction function processing to the reproduction signal based on the correction function processing determined by the correction function processing determination means; and a waveform or the like for the reproduction signal subjected to the correction function processing by the correction function processing means. Information reproducing apparatus characterized by comprising a waveform equalization processing means for performing waveform equalization processing based on the determined waveform equalizing process by the processing determining means. 18. A multivalued information sequence in which a plurality of one kind of positive integers are arranged and a plurality of zeros are added thereto, and a plurality of zeros are added before and after the positive integers. A multi-valued information sequence reproducing means for reproducing a multi-valued information sequence from a recording medium on which the calibration information of the multi-valued information sequence and the user information of the multi-valued information sequence are recorded; and Obtain a superimposed signal obtained by superimposing the reproduced signal of the positive integer value of the partial multi-valued information sequence by shifting by a predetermined number every recording cycle of each value,
A correction function process for correcting the amplitude value of the reproduced signal is determined so that the median value of the superimposed signal and the amplitude value of the reproduced signal obtained by successively arranging a plurality of positive integer values of the synchronization information are substantially the same. Correction function processing determining means for performing the correction function processing determined by the correction function processing determining means, to determine the maximum value of the positive integer reproduction signal of the calibration information, Waveform equalization processing determining means for determining waveform equalization processing for making each amplitude before and after the value outside the recording cycle range substantially zero; and a reproduction signal of user information reproduced by the multi-value information sequence reproducing means. Correction function processing means for performing a correction function processing based on the correction function processing determined by the correction function processing determination means; and the waveform equalization processing on the reproduced signal subjected to the correction function processing by the correction function processing means Information reproducing apparatus characterized by comprising a waveform equalization processing means for performing waveform equalization processing based on the determined waveform equalizing process by a constant means. 19. The information reproducing apparatus according to claim 16, wherein the correction function processing is a linear function processing. 20. The information reproducing apparatus according to claim 16, wherein the correction function process is a second-order or higher-order function process. 21. A multi-value information sequence calibration information in which values from 1 to n-1 (n is an integer of 3 or more) are arranged on a recording medium, and a plurality of zeros are added before and after each value. The user information of the multi-value information sequence is recorded, the calibration information and the user information recorded thereon are reproduced from the recording medium, and the reproduced signal of each value from 1 to n-1 of the reproduced calibration information is reproduced. A maximum value is obtained, and a waveform equalization process is performed for each reproduction signal to make each amplitude before and after each maximum value outside the recording cycle range of each value substantially zero, and the reproduction signal of the reproduced user information is determined. An information recording / reproducing method, comprising performing a waveform equalization process based on the determined waveform equalization process. 22. A recording medium for recording calibration information of a multivalued information sequence obtained by adding a plurality of zeros before and after one positive integer value and user information of the multivalued information sequence, on the recording medium. Reproduce the calibration information and user information recorded therefrom, find the maximum value of the reproduced signal of a positive integer value of the reproduced calibration information, for the reproduced signal of the respective values before and after the maximum value An information recording method comprising: determining a waveform equalization process that makes each amplitude outside the recording cycle range substantially zero; and performing a waveform equalization process on the reproduced signal of the reproduced user information based on the determined waveform equalization process. Playback method. 23. A front multi-valued information sequence in which values from 1 to n-1 (n is an integer of 3 or more) are arranged on a recording medium, and a plurality of zeros are added before and after each value. Calibration information including a rear multi-value information sequence in which a plurality of values from 1 to n-1 are successively arranged, and user information of the multi-value information sequence, are recorded from the recording medium. The reproduced calibration information and user information are reproduced, and the maximum value of the reproduced signal of each value from 1 to n-1 of the reproduced front multi-valued information sequence is obtained. After performing a process of making each amplitude before and after the value outside the recording cycle range substantially zero, and making each amplitude substantially zero for each reproduced signal from 1 to n-1 of the front multi-valued information sequence. , And a plurality of each of the maximum values of the rear multi-valued information sequence from 1 to n-1. The waveform equalization process is performed to substantially match the respective maximum values after the respective amplitudes have been subjected to the process of making the respective amplitudes substantially zero, and the determined waveform equalization is performed on the reproduced user information reproduced signal. An information recording / reproducing method characterized by performing a waveform equalization process based on the process. 24. The information recording / reproducing method according to claim 21, wherein the change of the maximum value of the reproduced signal of each value from 1 to n−1 of the reproduced calibration information is linearized. An information recording / reproducing method, comprising: determining a correction function process for correcting an amplitude value; and performing a correction function process based on the determined correction function process on a reproduced signal of the reproduced user information. 25. The information recording / reproducing method according to claim 24, wherein the correction function processing is a linear function processing. 26. The information recording / reproducing method according to claim 23, wherein a reproduced signal of each value from 1 to n-1 of the front multi-valued information sequence is shifted by a predetermined number for each recording cycle of each value. Each superimposed signal obtained by superimposition is obtained, and the median value of each superimposed signal and the amplitude value of each reproduced signal obtained by continuously arranging a plurality of each of the rear multi-value information sequence from 1 to n-1 are calculated. Determining a correction function process that corrects the amplitude value of each of the reproduced signals so that they substantially match each other, and performing a correction function process based on the determined correction function process on the reproduced signal of the reproduced user information. Information recording and playback method. 27. A front multi-value information sequence in which a plurality of zeros are added before and after one positive integer value on a recording medium, and a rear multi-value information in which a plurality of the positive integer values are continuously arranged. The calibration information comprising the information sequence and the user information of the multi-value information sequence are recorded, and the calibration information and the user information recorded therein are reproduced from the recording medium, and the front multi-value of the reproduced calibration information is reproduced. The reproduction signal of the positive integer value of the information sequence is shifted by a predetermined number every recording cycle of the positive integer value and superimposed to obtain a superposition signal, and the median value of the superposition signal and the positive A correction function process for correcting the amplitude value of the reproduction signal is determined so that the amplitude value of the reproduction signal obtained by successively arranging a plurality of integer values of the above is substantially the same. Find the maximum value of the playback signal of the positive integer value of the calibration information, A waveform equalization process for making each amplitude outside the recording cycle range of the positive integer value before and after the maximum value of the signal approximately zero is determined, and the determined correction function process is performed on the reproduced signal of the reproduced user information. An information recording / reproducing method, comprising: performing a correction function process based on the correction function process; and performing a waveform equalization process based on the determined waveform equalization process on the reproduction signal subjected to the correction function process. 28. A multivalued information sequence synchronization information obtained by arranging a plurality of one kind of positive integer value on a recording medium and adding a plurality of zeros, and adding a plurality of zeros before and after the positive integer value. The calibration information of the multi-valued information sequence and the user information of the multi-valued information sequence are recorded, and the calibration information and the user information recorded thereon are reproduced from the recording medium, before the reproduced synchronization information. The reproduction signal of the positive integer value of the partial multi-valued information sequence is shifted by a predetermined number every recording cycle of the positive integer value and superimposed to obtain a superimposition signal, and the median value of the superimposition signal and the positive A correction function process for correcting the amplitude value of the reproduction signal is determined so that the amplitude value of the reproduction signal obtained by successively arranging a plurality of integer values of Find the maximum value of the reproduction signal of the positive integer value of the calibration information, A waveform equalization process for making each amplitude outside the recording cycle range of the positive integer before and after the maximum value substantially equal to 0 for the reproduced signal is determined, and the determined correction function process is performed on the reproduced user information reproduced signal. An information recording / reproducing method, comprising: performing a correction function process based on the above, and performing a waveform equalization process based on the determined waveform equalization process on the reproduction signal subjected to the correction function process. 29. The information recording / reproducing method according to claim 26, wherein the correction function processing is a linear function processing. 30. The information recording / reproducing method according to claim 26, wherein the correction function process is a second-order or higher-order function process. 31. A plurality of 0s before and after one positive integer value.
Wherein the calibration information of the multi-valued information sequence and the user information of the multi-valued information sequence are recorded such that the calibration information is reproduced first before the reproduction of the user information. Computer readable recording medium. 32. 1 to n-1 (n is an integer of 3 or more)
, And a front multi-valued information sequence in which a plurality of zeros are added before and after each value, and a rear multi-valued sequence in which each of the values from 1 to n-1 is successively arranged in plural numbers. Computer-readable information, wherein calibration information comprising an information sequence and user information of a multi-valued information sequence are recorded so that the calibration information is reproduced first before reproduction of the user information. recoding media. 33. A plurality of zeros before and after one positive integer value.
The calibration information and the user information of the multi-valued information sequence consisting of a front multi-valued information sequence obtained by adding A computer-readable recording medium, wherein the calibration information is recorded so as to be reproduced first before reproduction. 34. Synchronization information of a multilevel information sequence in which a plurality of one kind of positive integers are arranged and a plurality of zeros are added, and a plurality of zeros are added before and after the positive integers. Computer-readable, wherein the calibration information of the multi-valued information sequence and the user information of the multi-valued information sequence are recorded so that the calibration information is reproduced first before the reproduction of the user information. recoding media.