Abstract: An optical information recording medium which can be played back by both a playback system for an SD (Super-density Disk) and a playback system for an HDMCD (High Density Multimedia Compact Disk), or by both the playback system for the SD and a playback system for a CD (Compact Disk).

Abstract: An optical information recording medium which can be played back by both a playback system for an SD (Super-density Disk) and a playback system for an HDMCD (High Density Multimedia Compact Disk), or by both the playback system for the SD and a playback system for a CD (Compact Disk).

Abstract: A plurality of disk drive mechanisms are installed in a stationary state being arranged along the retrieving side of a disk rack, a disk mounting mechanism is transferred above the disk drive mechanisms by a transfer mechanism to obtain an objective disk from the disk rack and to set the disk to an objective disk drive mechanism. The disk mounting mechanism holds a plurality of clampers to supply or remove the clamper to or from a turntable.

Abstract: A record medium device recording/reproducing signals in a format without time code from a record medium, yet being able to record/reproduce time codes. Time-code conversion circuit 16 obtains a time code indicating a head of a track from time code signals synchronized with input signals. The system controller 3 records the input signals into an MD 1 through a magnetic head 24. Further, the system controller 3 records the obtained time code indicating the head of the track into a UTOC area of the MD 1, relating the time code to the track in question. By this construction, it is possible to generate time codes synchronized with reproduction signals based on a time code which is related to a track to be reproduced and indicates a head of the track in question.

Abstract: A disk reproducing apparatus having an auto-changer allowing information recorded on both sides of a disk to be reproduced. The apparatus has a storing unit for storing disks having information recorded on both sides, a reproducing unit for reproducing the information recorded on a disk, and a transferring unit, for extracting a disk from the storing unit and holding it in a disk loader and transferring it to the reproducing unit. The disk loader has first and second disk holding means which hold the disk on one and the other side surface, respectively of the disk loader by extracting the disk from the storing unit and moving the disk in a direction parallel to the surface of the disk, and a rotating-down means for rotating-down the disk loader toward either of two directions opposite to each other.

Abstract: A multilayer optical information medium provided with structure in which first and second substrates respectively provided with two to four layers of planar information areas are respectively arranged outside wherein the thickness of the above-described first and second substrates is set in the range of 0.52 to 0.65 mm. The above-described planar information area consists of embossed pits provided, for example on the surface of respective substrates or on the surface of a layer formed by transparent material and a semi-reflective layer provided on the embossed pits. A planar information area arranged in the farthest position from respective substrates is provided with a reflective layer in place of the above-described semi-reflective layer. The planar information area arranged in the farthest position from respective substrates may be constituted by a recording layer and a reflective layer provided on the recording layer.

Abstract: An optical information recording medium which can be played back by both a playback system for an SD (Superdensity Disk) and a playback system for an HDMCD (High Density Multimedia Compact Disk), or by both the playback system for the SD and a playback system for a CD (Compact Disk).

Abstract: An optical disk having both CLV and CAV control regions is recorded by a recording system that allows moving from CLV control to CAV control without interrupting the data stream. The switching is accomplished by a switching device selecting between the output of a CAV control signal generator that is equipped with a divider which sets a certain number of frames or sectors for each single rotation of the disk and the output of a CLV control signal generator, a detector that detects whether the frequency and phase of the output of the signal generator of the drive motor and the control signal not selected by the switching device match, and the output of this detection means.

Abstract: An optical disk having both CLV and CAV control regions is recorded by a recording system that allows moving from CLV control to CAV control without interrupting the data stream. The switching is accomplished by a switching device selecting between the output of a CAV control signal generator that is equipped with a divider which sets a certain number of frames or sectors for each single rotation of the disk and the output of a CLV control signal generator, a detector that detects whether the frequency and phase of the output of the signal generator of the drive motor and the control signal not selected by the switching device match, and the output of this detection means.

Abstract: In a recording and reproducing apparatus capable of continuously recording to and reproducing from a plurality of media, the recording and reproducing apparatus includes a recording and reproducing device for recording data to and reproducing it from the medium and a controller for performing edition such as deleting, connecting, and separating the recorded data.

Abstract: A laminate type optical information recording medium which is identifiable on the basis of its color, is formed without change to conventional manufacturing steps by laminating two optical information recording media, each of which includes at least a substrate on which information is recorded, a semi-transparent layer for reflecting a reproduction laser beam, a transparent resin layer formed to cover the semi-transparent layer, a reflection layer for reflecting the reproduction laser beam and an adhesive layer formed to cover the reflection layer. The two substrates of the laminate type optical information recording medium have different transmission spectra in a visible region.

Abstract: An optical disk having both CLV and CAV control regions is recorded by a recording system that allows moving from CLV control to CAV control without interrupting the data stream. The switching is accomplished by a switching device selecting between the output of a CAV control signal generator that is equipped with a divider which sets a certain number of frames or sectors for each single rotation of the disk and the output of a CLV control signal generator, a detector that detects whether the frequency and phase of the output of the signal generator of the drive motor and the control signal not selected by the switching device match, and the output of this detection means.

Abstract: A system and method for synthesizing musical melodies on a computer displays a plurality of figures on a display device, one or more of which can be selected by a user for conversion into a series of sounds to create a melody to be played through an electronic musical instrument. In operation, various sub-routines stored within a system processor are used to manipulate attributes such as position, shape, color, and size of the displayed figures to generate corresponding sounds having a desired pitch, intensity, timbre, and sound length. The displayed figures are then made to move in accordance with user-selected rules, or with melodies played on an electronic musical instrument. An octave filter or wide range filter may be employed to change other attributes of the individual sounds comprising the melody, or of the entire melody itself.

Abstract: A system and method for the conversion of digital signals to analog signals increases the resolution of the output analog signal beyond the analog quantization size associated with the given input digital word length. The rate of change of the Least Significant Bits (LSB)is detected. The "square waves" produced by changes in the polarity of the LSB correspond to low amplitude signals comprising audible high frequency components. The high frequency noise associated with these detected low signal levels is attenuated by digital low pass filters of varying cut-off frequencies at the output stage. This creates a signal of a resolution higher than the step size inherent in the length of the input digital word, and reduces high frequency noise at low signal amplitudes, resulting in a smooth analog output signal.

Abstract: An optical disc playback device of the so-called "carousel" type comprises a disc transport turntable rotatably mounted within the player housing. The underside of the turntable has an annular ridge with notches formed therein, and the housing comprises a photocouple which detects the presence or absence of the notches. The notches are so configured that each disc-holding section of the turntable has a distinct set of notches associated therewith, and each set of notches includes a central position-indicating notch and disc number-indicating notches disposed symmetrically on both sides of the central position-indicating notch.

Abstract: An optical system moving apparatus having first and second driving motors, transmitting screws coupled to the first and second driving motors, and a moving table on which an optical system is mounted and which is coupled through the transmitting screws to the first and second driving motors, wherein the moving table is driven by a combined output of the first and second driving motors.

Abstract: Disc playback apparatus is provided with a rotatable carousel carrying a plurality of discs. The carousel is stopped so that a disc to be selected arrives at a predetermined position where it is removed and transferred to the playback apparatus and vice-versa. The carousel has a disc-shaped base and a plurality of disc clampers located on the base in a radial direction. Each of the clampers are formed of a disc support and a clamper member supported by a bearing provided on said disc support and have a convex portion adapted to engage with the bore of said disc. A spring member biases the convex portion of the clamper member so that the disc is held against the disc support and is selectively disengageable against the bias of said spring member so that it may be released from said carousel for transfer to said disc playback apparatus by said transfer means.