Pioneer Corporation

Pioneer Digital Design and Manufacturing Corporation

Yoshio Sasaki

Hiroyuki Uchino

Shogo Miyanabe

Eiji Muramatsu

Junichi Furukawa

Kunihiko Horikawa

Shoji Taniguchi

Hidenori Nakagawa

Masahiro Kato

Akira Shirota

Hiroshi Nishiwaki

Yasuhiko Tominaga

Hideyuki Muto

Shoji Fuse

Akiyoshi Inoue

Takao Tagiri

Seiro Oshima

Kunio Matsumoto

Satoshi Uchiumi

Hisao Tanaka

Kenichi Oono

Hirohisa Tsudome

Yasushi Oshima

Toshihiko Maruyama

Toshihiko Takishita

Haruyasu Sakata

Masatoshi Adachi

Hiroyuki Tanaka

Tadashi Ueda

Yoshiharu Suzuki

Ryo Sato

Toshifumi Harada

Masakazu Furukawa

An information recording/reproducing method includes: setting light beam power from a light source, to second power P, which is weaker than first power P, and detecting the number of the recording layers provided for an optical disc; controlling an objective lens to focus the light beam on one recording layer which is the closest to the objective lens, in a condition that the detected number of the recording layers &#x2267;3; setting the power of the light beam to third power Pbetween Pand P; specifying the number of the recording layers provided for the optical disc on the basis of layer information, which is information associated with the one recording layer; and setting the power of the light beam to Preading the layer type information recorded in advance in the one recording layer, and specifying a disc type based on the read layer type information.

Information recording / reproducing method and apparatus, and information reproducing apparatus

An information recording apparatus () is provided with: a recording device () for recording information onto an information recording medium () by irradiating the information recording medium with a recording laser beam (L); a controlling device () for recording calibration data onto the information recording medium by using the recording laser beam in which the power is adjusted gradually; and a detecting device () for detecting with a push-pull signal after the recording of the calibration data, the recording of the calibration data being ended if the push-pull signal exceeds a predetermined range, an optimum power of the recording laser beam being determined from a jitter amount included in a reproduction signal.

Information recording device, method, and computer program

An information reproducing apparatus () is provided with: an offset adding device (--) for adding an offset value (OFS) which can be set to be variable, to a read signal (R) read from a recording medium (); a correcting device () 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 () for performing a waveform equalization process on the read signal in which the waveform distortion is corrected.

Apparatus, method and program for waveform equalization on a read signal obtained by reading the record data recorded on a recording medium

An information recording apparatus () is provided with: a recording device () for recording information onto an information recording medium () by irradiating the information recording medium with a recording laser beam (L); a controlling device () for recording calibration data onto the information recording medium by using the recording laser beam in which the power is adjusted gradually; and a detecting device () for detecting degree of modulation of a reproduction signal after the recording of the calibration data, the recording of the calibration data being ended if the degree of modulation exceeds a predetermined range, an optimum power of the recording laser beam being determined from a jitter amount included in a reproduction signal.

Optical disc recording apparatus and method, and computer program

An information recording apparatus () is provided with: a recording device () for recording information onto an information recording medium () by irradiating the information recording medium with a recording laser beam (L); a controlling device () for recording calibration data onto the information recording medium by using the recording laser beam in which the power is adjusted gradually, thereby obtaining the optimum amount of the recording laser beam; and a detecting device () for detecting returned light simultaneously with the recording in the recording of the calibration data, the recording of the calibration data being ended if amount of the returned light exceeds a predetermined range, an optimum power of the recording laser beam being determined from a jitter amount included in a reproduction signal.

Optical disc recording device, method, and computer program

An information reproducing apparatus () is provided with: a judging device () for judging whether or not a read signal (R) read from a recording medium () satisfies a desired reproduction property; a correcting device () 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 () for performing a waveform equalization process on the read signal in which the waveform distortion is corrected.

Information reproducing apparatus and method, and computer program

An information reproducing apparatus () is provided with: a waveform shaping device () for performing waveform shaping on a read signal (R) read from a recording medium (), on the basis of a reference amplification factor; a correcting device () 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 () 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.

An optical recording/reproducing systemreads a recorded signal written to a recording track of a recording mediumby light. The light is modulated by a drive signal on which a frequency signal is superimposed. The light is scanned along the recording track at a predetermined scan velocity. The optical recording/reproducing systemincludes a computerand an LD driverthat control, based on the scan velocity, a superimposed magnitude of the frequency signal on the drive signal.

Optical recording/reproducing method, system, and program

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

Device and method for reproducing information, and computer program

An information recording apparatus () is provided with: a first judging device () for judging whether or not a tracking error signal is greater than or equal to a first threshold value; a detecting device () for detecting, as a detection angle, a rotation angle of an information recording medium () when it is judged that the tracking error signal is greater than or equal to the first threshold value; and a second judging device () for judging whether or not the judgment that the tracking error signal is greater than or equal to the first threshold value is performed at the same detection angle.

Information recording apparatus and method, information reproducing apparatus and method, and computer program

An information reproducing apparatus () is provided with: an offset adding device (--) for adding a first offset value (OFS) which can be set to be variable, to a read signal (R) read from a recording medium (); a correcting device () 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 (--) 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 () for performing a waveform equalization process on the read signal in which the second offset value is subtracted.

An information reproducing apparatus () is provided with: a correcting device () for correcting waveform distortion occurring in a read signal corresponding to a long mark, of read signal (R) read from a recording medium (); an amplitude limiting device () for limiting an amplitude level of the read signal in which the waveform distortion is corrected, by a predetermined amplitude limit value (L, &#x2212;L), thereby obtaining an amplitude limit signal; and a filtering device () for performing a high-frequency emphasis filtering process on the amplitude limit signal, thereby obtaining an equalization-corrected signal.

A recording apparatus includes: a first calculating device for calculating an optimum power for recording the data pattern into a recording-scheduled area (RSA) in an inner area; a first controlling device recording the data pattern with the optimum power outside an end on an outer side of the RSA; a second calculating device calculating an adjustment power used in adjusting a recording condition outside the end on the outer side of the RSA, considering a difference between recording sensitivity inside and outside the RSA; a second controlling device recording the data pattern for adjusting the recording condition with the adjustment power outside the RSA; a reading device obtaining a read signal; a measuring device measuring read signal jitter; an adjusting device adjusting the recording condition for satisfactory jitter; and a third controlling device to record the data pattern into the RSA using the optimum power and the adjusted recording condition.

Recording apparatus and method, computer program, and recording medium

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.

Recording device and method, and computer program, and recording medium

An optical recording/reproducing systemreads, based on a predetermined reproduction clock, information associated with a recording track of a recording medium by irradiating frequency light. The frequency light is scanned at a predetermined scan velocity. The optical recording/reproducing system includes a computer, a DSP, and a LD driver that modulate light by a drive signal on which a frequency signal is superimposed to thereby output the frequency light, and synchronizes a frequency of the frequency signal with a frequency of the reproduction clock according to the scan velocity.

Growing community of inventors

Tokorozawa, Japan

Yoshio Sasaki