Abstract: The present invention provides an information disc recording/playback apparatus which includes a track cross detection means (112), a track cross direction detection means (113), a rotation angle detection means (114), and a count means (115), detects the track pitch of a disc, evaluates the vibration amount, or vibration speed, or vibration acceleration considering the track pitch of the disc, and determines a maximum rotation speed that is lower than the allowable vibration amplitude, vibration speed, or vibration acceleration of the information disc recording/playback apparatus; as well as a vibration detection method for the information disc recording/playback apparatus. This information disc recording/playback apparatus can perform vibration detection using a single threshold value that is independent of the type of the disc, without using an acceleration sensor, and further, the apparatus can accurately perform vibration detection even when direction detection is difficult.

Abstract: The present invention provides an information disc recording/playback apparatus which includes a track cross detection means (112), a track cross direction detection means (113), a rotation angle detection means (114), and a count means (115), detects the track pitch of a disc, evaluates the vibration amount, or vibration speed, or vibration acceleration considering the track pitch of the disc, and determines a maximum rotation speed that is lower than the allowable vibration amplitude, vibration speed, or vibration acceleration of the information disc recording/playback apparatus; as well as a vibration detection method for the information disc recording/playback apparatus. This information disc recording/playback apparatus can perform vibration detection using a single threshold value that is independent of the type of the disc, without using an acceleration sensor, and further, the apparatus can accurately perform vibration detection even when direction detection is difficult.

Abstract: The present invention provides an information disc recording/playback apparatus which includes a track cross detection means (112), a track cross direction detection means (113), a rotation angle detection means (114), and a count means (115), detects the track pitch of a disc, evaluates the vibration amount, or vibration speed, or vibration acceleration considering the track pitch of the disc, and determines a maximum rotation speed that is lower than the allowable vibration amplitude, vibration speed, or vibration acceleration of the information disc recording/playback apparatus; as well as a vibration detection method for the information disc recording/playback apparatus. This information disc recording/playback apparatus can perform vibration detection using a single threshold value that is independent of the type of the disc, without using an acceleration sensor, and further, the apparatus can accurately perform vibration detection even when direction detection is difficult.

Abstract: Information about the number of traversed tracks is acquired with a code at a first rotational speed and a second rotational speed in each area provided by dividing one rotation into m (m is a natural number equal to or larger than 1). As to the information about the number of traversed tracks, a difference is calculated between the areas. A value proportionate to the sum of absolute values of the information about the traversed tracks in the areas is used as a vibration detection value proportionate to vibration amplitude.

Abstract: The present invention relates to control of the reproduction speed of a recording medium on which data are recorded, and provides a data reproduction apparatus and a data reproduction method which are able to control the data reproduction speed according to the reproduction frequencies of different data to suppress power consumption and heat generation. When data of the CD-ROM standard or the like, which are temporarily stored in a processing part or the like, are reproduced after data of the CD-DA standard or the like, which are to be sequentially converted and outputted, are reproduced at a first reproduction speed, the reproduction is performed at a third reproduction speed that is lower than the highest second reproduction speed and higher than the first reproduction speed.

Abstract: A disc playback system according to this invention, as shown in FIG. 1, comprises a pickup 1 for reading information from an information disc 2 on which data are recorded at a constant linear velocity, a disc motor 16 for rotating the information disc 2, a digital signal processing means 7 for digitizing data according to the playback format of the information disc 2, an interface means 19 for transmitting the digitized data to an external device and a buffer memory 18 for temporarily containing the data, and further includes a means for detecting the linear velocity and track pitch of the information disc 2 to decide the reference value for the velocity control of the disc motor 16 on the basis of the detected values of the linear velocity and track pitch and the value of the maximum radius of the data record area. According to the so-constructed disc playback system, the maximum playback velocity of the system can be obtained even in the case of discs having different track pitches.

Abstract: The present invention includes a playback means for playing back data on a disk; an audio output unit for outputting audio data as an audio signal to the outside when the audio data is played back by the playback unit; an audio level manipulation unit for manipulating the output level of the audio signal outputted from the audio output unit; a detection unit for detecting a set value of the audio level manipulation unit; and a rotation speed control unit for controlling the rotation speed of the disk which is played back by the playback unit on the basis of the set value detected by the detection unit only when no audio signal is outputted from the audio output unit. In this disk playback device, less influence is exerted upon the operation of the drive even when an erroneous operation is performed and the user can arbitrarily change the disk rotation speed by a simple operation without adding a new operation unit.

Abstract: A decelerating method with low power consumption can be selected when rapid deceleration is not required. A disk can be stopped promptly and reliably even when a need arises for stopping the disk during deceleration of the disk by the method with low power consumption. In a disk device having a function of decelerating or stopping a rotating disk, depending on the kind of a command upon decelerating or stopping, the operation for decelerating or stopping is switched between a forced deceleration or stop operation by applying a reverse-directional voltage to a disk motor which rotates the disk so as to forcedly decelerate or stop the disk, and a power saving deceleration or stop operation with lower power consumption than the forced deceleration or stop operation so as to decelerate or stop the disk.

Abstract: A disk device for controlling the revolution of a disk, and the operation of a focus coil and a tracking coil with high precision even during the low-velocity revolution of a disk is provided. A control signal gain switch circuit (12) is provided as control signal gain switch means for switching depending on an operation state and outputting a gain of at least one of a spindle motor control signal (10) output to a spindle motor control circuit (3) as the first control unit for controlling a spindle motor (2) which revolves the disk (1), and a focus tracking control signal (11) output to the focus tracking control circuit (4) as the second control unit for controlling an optical pickup (5) which reads information in the disk (1) and outputs a high frequency signal.

Abstract: An error recovery method and an apparatus achieve error recovery when reading errors occur at one or more addresses on a plurality of simultaneously readable tracks, in a multi-track disk reproducing apparatus. The reproducing apparatus with a plurality of reading head can simultaneously read data on the plurality of adjacent tracks on a disk having the plurality of tracks formed on its recording surface. The method comprises a step for storing a reading error-occurrence-address in an error occurrence, and a step for determining a moving process of the plurality of reading head for error recovery after the error occurrence based on the stored result.

Abstract: A work is advanced according to an instruction of reproduction information with a minimum operation, by automatically stopping the reproduction information at a desired position and resuming it as desired.

Abstract: The present invention provides an information disc-recording/playback apparatus which includes a track cross detection means (112), a track cross direction detection means (113), a rotation angle detection means (114), and a count means (115), detects the track pitch of a disc, evaluates the vibration amount, or vibration speed, or vibration acceleration considering the track pitch of the disc, and determines a maximum rotation speed that is lower than the allowable vibration amplitude, vibration speed, or vibration acceleration of the information disc recording/playback apparatus; as well as a vibration detection method for the information disc recording/playback apparatus.

Abstract: Spiral tracks are formed on a recording surface of an information disk such as an optical disk, and data is recorded by interleaving technique as well as adding error correction information. A disk driver rotates the information disk at a specified speed. Plural tracks are read simultaneously by a reading device. Analog data of the plural lines are converted into digital data by an A/D converter, and stored in a frame data buffer memory by each line. The data are respectively decoded sequentially in a decoder. When the disk makes one rotation, the data of next track is read in duplicate as much as the portion of the interleaving length of the tail data of each one of the plural tracks being read on the information disk. By data aligning means, according to a command from a controller, the data—corresponding to the number of tracks that can be read simultaneously—being output in parallel from the decoder are aligned sequentially from the head data on the information disk.

Abstract: The direction in which an information disk apparatus is installed is judged without employing a sensor means.

Abstract: The present invention includes a playback means for playing back data on a disk; an audio output means for outputting audio data as an audio signal to the outside when the audio data is played back by the playback means; an audio level manipulation means for manipulating the output level of the audio signal outputted from the audio output means; a detection means for detecting a set value of the audio level manipulation means; and a rotation speed control means for controlling the rotation speed of the disk and a rotation speed control means for controlling the rotation speed of the disk which is played back by the playback means on the basis of the set value detected by the detection means only when no audio signal is outputted from the audio output means.

Abstract: To provide a disk playback system that effectively uses the maximum playback speed and maximum search speed that the system owns. A disk playback system that searches for a desired position of a disk (2) on which information data is recorded at constant linear velocity after receiving a command from an external device, reads out desired information data, and outputs information data corresponding to the playback format of the disk. An outermost-perimeter-address memory circuit (21) renews stored address information to the newest address information, if the address information of the newest address accessed according to an access instruction of said disk indicates the newest address is outer perimeter than the outermost address that has been accessed, and determines a criterion for speed control of the disk (2), based on the renewed address information. A CAV control circuit (20) controls the speed of the disk 2, based on the determined criterion.

Abstract: The present invention relates to control of the reproduction speed of a recording medium on which data are recorded, and provides a data reproduction apparatus and a data reproduction method which are able to control the data reproduction speed according to the reproduction frequencies of different data to suppress power consumption and heat generation.

Abstract: A disc loading apparatus is provided at a lower longitudinally extending edge of an opening lid of generally rectangular shape with a continuously curved edge that extends from both ends toward a center of the lower longitudinally extending edge in a direction toward the upper longitudinally extending edge of the lid. The apparatus is also provided at a surface of the opening lid that contacts the disc, with a continuously curved surface that extends from both ends toward the center of the opening lid in a direction toward an inside of the disc loading apparatus.