Abstract: A recording apparatus (1) is provided with: a detecting device (21) for detecting an appearance frequency of at least one of a signal component of a plurality of types of marks and a signal component of a plurality of types of spaces which have different run lengths and which are included in a read signal read from a recording medium (100) and which have different run lengths which are included in the read signal and which have different run lengths; and a judging device (22) for judging whether or not a jitter obtained from the read signal is effective, on the basis of a change amount of the appearance frequency.

Abstract: A recording apparatus is provided with: a recording device for recording a data pattern onto a recording medium provided with a user data area; a first controlling device for controlling the recording device to record the data pattern for adjusting the recording condition into an area portion which is outer than an end on an outer side of a recording-scheduled area portion and in which the data pattern is scheduled to be recorded; a reading device for reading the data pattern recorded by the control of the first controlling device, thereby obtaining a read signal; a measuring device for measuring jitter of the read signal; an adjusting device for adjusting a recording condition such that the jitter satisfies a desired condition, and a second controlling device for controlling the recording device to start the recording into the recording-scheduled area portion by using the recording condition adjusted by the adjusting device.

Abstract: A recording apparatus (1) comprises a first calculating means (22) that calculates an optimum power to be used for recording a data pattern in a recording-scheduled area portion of a radially inner area (111); a first control means (22) that uses the optimum power to record a data pattern in an area portion radially outer than the recording-scheduled area portion; a second calculating means (22) that takes into account a difference between the recording sensitivity of the recording-scheduled area portion and the recording sensitivity of the area portion radially outer than the recording-scheduled area portion to calculate an adjustment power to be used for adjusting the recording condition in the area portion radially outer than the recording-scheduled area portion; a second control means (22) that records, in the area portion radially outer than the recording-scheduled area portion, a data pattern for adjusting the recording condition by use of the adjustment power; a reading means (12) that acquires a read

Abstract: A recording apparatus includes: a first strategy calculating device (SCD) for calculating a first optimum strategy allowing jitter recorded at a first speed to satisfy a desired condition by adjusting a first standard strategy; a second SCD for calculating a second standard strategy at a second speed by performing clock cycle conversion according to a difference between the first and second speeds on the first standard strategy; a second power calculating device for calculating a second optimum power used at the second speed; a third SCD for calculating a second optimum strategy allowing jitter recorded at the second speed to satisfy a desired condition, by adjusting the second standard strategy; and a fourth SCD for calculating a third optimum strategy at a third speed, based on each of a difference between the first standard and optimum strategies and a difference between the second standard and optimum strategies.

Abstract: The present invention provides an information reproducing apparatus capable of preventing occurrence of erroneous detection as if a recording pit longer than the longest pit in the standard exists on an optical disk even in the case where the difference between frequency of a reproduction signal and frequency of a reproduction clock signal becomes large. When the difference between frequency of a detection signal Sp detected from an optical disk DK and frequency of a reproduction clock signal Scl becomes large, for example, the gain of a high frequency band corresponding to a recording pit length in the range of 2T to 4T is emphasized more than normal one by an equalizer 2, and the resultant is used for detecting a longest-pit-length error.

Abstract: A recording apparatus (1) is provided with: a recording device (11) for recording a data pattern onto a recording medium (100); a first controlling device (22) for stopping the recording; a reading device (11) for reading the data pattern which is recorded immediately before the recording is stopped, thereby obtaining a read signal; a measuring device (19) for measuring jitter of the read signal; an adjusting device (21) for adjusting a recording condition such that the jitter satisfies a desired condition, and a second controlling device (22) for restarting the recording of the data pattern by using the adjusted recording condition.

Abstract: An information reproducing apparatus (1) is provided with: a correcting device (18) for correcting waveform distortion occurring in a read signal corresponding to a long mark, of read signal (RRF) read from a recording medium (100); an amplitude limiting device (182) for limiting an amplitude level of the read signal in which the waveform distortion is corrected, by a predetermined amplitude limit value (L, ?L), thereby obtaining an amplitude limit signal; and a filtering device (183) for performing a high-frequency emphasis filtering process on the amplitude limit signal, thereby obtaining an equalization-corrected signal.

Abstract: An information reproducing apparatus (1) is provided with: an offset adding device (19-1, 19-2) for adding a first offset value (OFS) which can be set to be variable, to a read signal (RRF) read from a recording medium (100); a correcting device (18) for correcting waveform distortion occurring in a read signal corresponding to a long mark, of the read signal to which the first offset value is added; an offset subtracting device (19-2, 19-3) for subtracting a second offset value (OFS) which can be set to be variable, from the read signal in which the waveform distortion is corrected; and a waveform equalizing device (15) for performing a waveform equalization process on the read signal in which the second offset value is subtracted.

Abstract: An information reproducing apparatus (1) is provided with: a correcting device (18) for correcting waveform distortion occurring in a read signal corresponding to a long mark, of a read signal (RRF) read from a recording medium (100); and a processing device (15) for performing a PRML (Partial Response Maximum Likelihood) process on the read signal in which the waveform distortion is corrected

Abstract: An information reproducing apparatus (1) is provided with: a waveform shaping device (14) for performing waveform shaping on a read signal (RRF) read from a recording medium (100), on the basis of a reference amplification factor; a correcting device (18) for correcting waveform distortion occurring in a read signal corresponding to at least a long mark, of the read signal on which the waveform shaping is performed; and a waveform equalizing device (15) for performing a waveform equalization process on the read signal in which the waveform distortion is corrected, the waveform shaping device arbitrarily increases the reference amplification factor.

Abstract: An information reproducing apparatus (1) is provided with: a judging device (20) for judging whether or not a read signal (RRF) read from a recording medium (100) satisfies a desired reproduction property; a correcting device (18) for correcting waveform distortion occurring in a read signal corresponding to a long mark, of the read signal if it is judged that the read signal does not satisfy the desired reproduction property; and a waveform equalizing device (15) for performing a waveform equalization process on the read signal in which the waveform distortion is corrected.

Abstract: An information reproducing apparatus (1) is provided with: an offset adding device (19-1, 19-2) for adding an offset value (OFS) which can be set to be variable, to a read signal (RRF) read from a recording medium (100); a correcting device (18) for correcting waveform distortion occurring in a read signal corresponding to a long mark, of the read signal to which the offset value is added; and a waveform equalizing device (18) for performing a waveform equalization process on the read signal in which the waveform distortion is corrected.

Abstract: An information recording apparatus (1) is provided with: a recording device (11) for recording a data pattern onto a recording medium (100); a reading device (11) for reading the data pattern, thereby obtaining a read signal; an amplitude limit filtering device (15) for limiting an amplitude level of the read signal by using a predetermined amplitude limit value, thereby obtaining an amplitude limit signal and for performing a high frequency emphasis filtering process on the amplitude limit signal, thereby obtaining an equalization-corrected signal; a measuring device (19) for measuring jitter of the equalization-corrected signal or the read signal; a detecting device (20) for detecting the data pattern of the equalization-corrected signal; and an adjusting device (21) for adjusting a recording condition such that the jitter satisfies a desired condition, with reference to the data pattern.

Abstract: An information recording apparatus (1) comprises a recording means (11) for recording a data pattern on a recording medium (100), a reading means (11) for reading the data pattern to acquire a read signal, adding means (23, 24) for adding an offset signal to the read signal to acquire an offset-added signal, a measurement means (19) for measuring the jitter of the offset-added signal, and an adjustment means (21) for adjusting a recording condition so that the jitter satisfies a desired condition

Abstract: An information reproducing apparatus (1) is provided with: an amplitude limiting device (151, 152) for obtaining an amplitude limit signal (RSLIM) by limiting an amplitude level of a read signal (RRF) read from a recording medium (100) on the basis of a predetermined amplitude limit value; and a filtering device (158) for obtaining an equalization-corrected signal (RSH) by performing a high-frequency emphasizing and filtering process on the amplitude limit signal, the amplitude limiting device individually sets each of an upper limit (L1) and a lower limit (L2) of the amplitude limit value.

Abstract: An information reproducing apparatus (1) is provided with: an amplitude limiting device (151, 152) for obtaining an amplitude limit signal (RSLIM) by limiting an amplitude level of a read signal (RRF) read from a recording medium (100) on the basis of a predetermined amplitude limit value (L); a filtering device (153) for obtaining an equalization-corrected signal by performing a high-frequency emphasizing and filtering process on the amplitude limit signal; and an adjusting device (18) for variably adjusting a reference level which indicates a reference point of the amplitude level on the amplitude limiting device.

Abstract: An information recording apparatus (2) is for forming a record mark corresponding to a recording signal by applying a laser beam to a recording medium, and is provided with: a light source (21) for emitting the laser beam; and a signal generating device (22) for generating a recording pulse signal for driving the light source on the basis of the recording signal, the recording pulse signal includes a mark period and a space period, a level of the recording pulse signal corresponds to a recording power by which waveform distortion is greater than or equal to an upper limit (L) or is less than or equal to a lower limit (?L) of an amplitude limit value on a limit equalizer (15), in the mark period corresponding to a long mark.

Abstract: An information recording apparatus forms a record mark corresponding to a recording signal by applying a laser beam to a recording medium, and includes: a light source for emitting the laser beam; a signal generating device for generating a recording pulse signal for driving the light source on the basis of the recording signal; a test-writing device for performing test-writing; and a determining device for determining at least one of a power and a pulse width of the recording pulse signal on the basis of a test-writing result, the test-writing device performs the test-writing by changing the power of the recording pulse signal, the determining device determines the power, by which waveform distortion is greater than or equal to an upper limit or is less than or equal to a lower limit of an amplitude limit value on a limit equalizer in the mark period corresponding to the long mark.

Abstract: A reproducing device is provided with a beam irradiating means, which irradiates one track on a recording medium with a main beam and irradiates a position deviated from the irradiation position of the main beam with a sub beam; a main signal detecting means for outputting a main reproduction signal based on the main beam; a sub signal detecting means, which is divided by a dividing line along the tangent line direction of the one track, has a plurality of light receiving parts including a first light receiving part on a side close to the one track, and outputs a plurality of sub reproduction signal corresponding to detection light from the plurality of light receiving parts; a delaying means for relatively delaying the main reproduction signal and the sub reproduction signal; a delay quantity setting means for setting a delay quantity; and a crosstalk canceller for removing crosstalk from the delayed main reproduction signal.

Abstract: The present invention provides an information reproducing apparatus capable of preventing occurrence of erroneous detection as if a recording pit longer than the longest pit in the standard exists on an optical disk even in the case where the difference between frequency of a reproduction signal and frequency of a reproduction clock signal becomes large. When the difference between frequency of a detection signal Sp detected from an optical disk DK and frequency of a reproduction clock signal Scl becomes large, for example, the gain of a high frequency band corresponding to a recording pit length in the range of 2T to 4T is emphasized more than normal one by an equalizer 2, and the resultant is used for detecting a longest-pit-length error.