Abstract: An optical disk has grooves and lands located on the disk. A predetermined distance between the grooves and lands is defined as a predetermined track pitch. The predetermined track pitch is defined in term of a laser wavelength used during an operation. The grooves have a depth “d” in relation to the lands. The depth is related to a parameter variable “a” and a refraction index “n” of a substrate.

Abstract: The invention relates to methods for making mold tools. More particularly, the mold tools are used for molding a resin substrate which has fine pits, i.e., concavities and protuberances. The invention also pertains to a method for manufacturing a resin substrate. Such resin substrates may be used as an optical disk, a magnetic disk, a hard disk, etc., for recording data. According to a preferred embodiment of the invention, a first metallic (Ni) mold tool (father) is made which is a duplicate of a master substrate, then a resin mold tool (mother) is made which is a duplicate of the first metallic mold tool and finally a second metallic (Ni) mold tool (son) is made which is a duplicate of the resin mold tool. Both the father and son may be referred to a “stamper”. The invention also relates to methods of manufacturing a mold tool for molding the base of an optical disk having at least one signal recording region and at least one non-signal recording region.

Abstract: A hybrid magnetic-optical head apparatus wherein one or more solid state lasers, magnetic field biasing elements, magnetic sensing elements, and an aerodynamically shaped slider comprise a single integrated, monolithic device fabricated from the same base semiconductor material into an optical head. The monolithic optical head can be quickly and easily attached to the read arm of an optical read/write device without requiring attachment of separate laser and magnetic elements, and without micropositioning or use of optical microscopy for positioning the lasers or magnetic elements. The hybrid magnetic-optical head apparatus includes a magnetic-optical function region having a semiconductor laser and at least one magnetic element. Preferably, the magnetic-optical function region of the substrate includes a magnetic field biasing element associated with the semiconductor laser, as well as a magnetic sensing element.

Abstract: A memory interface for connecting a bus to memory comprises an input, a buffer, an address input, a generator, and a writer. The input receives a plurality of data words from the bus. The buffer buffers the data words received from the bus. The address input receives from the bus addresses associated with the plurality of data words. The generator generates a series of addresses in the memory into which the buffered data words may be written. The series of addresses are derived from the received addresses. The writer writes the buffered data words into the memory at the generated addresses.

Abstract: A time and work tracker that automatically collects and analyzes information about time and work performed on a wireless device is described herein. According to the present invention, a time and work tracking function is initiated on a wireless device. Thereafter, a user begins to perform work on the wireless device. As the user works, the tracking function on the wireless device collects data relating to the activities performed by the user. The collected data is then analyzed to determine what types of work the user has actually performed.

Abstract: Digital data bits are stored at storage locations at plural depths within a holographic medium of a holographic storage disk in the form of selective, localized alterations in a format hologram. Micro-localized regions of a reflection format hologram extending throughout the medium are deleted by focusing a high-power laser beam at desired storage locations. The deletion regions have a lower reflectivity than the surrounding parts of the format hologram. Tunable-focus storage and retrieval heads, as well as dynamic aberration compensators, are used for multi-depth access. Storage and retrieval may each be achieved with a single head.

Abstract: Disclosed is a high-speed dynamic actuating system for optical disks, particularly useful in an optical disk drive, wherein a closed-loop approach is used to overcome the diversity between devices and thus meet the requirement for high speed track-accessing and solve the problems in that the convention open-loop track-jumping takes a long period of time to perform segmental adjustment. The pick-up head is activated by applying high-speed dynamic actuation of the lens so as to conform to the pre-determined velocity curve and eliminate the wobble of the lens caused by different track-jumping times in an optical disk drive and a hard disk. In addition, said system can be implemented in an integrated circuit (IC), which is directly controlled by the hardware and thus effectively simplifies the complicated configuration as in the prior art.

Abstract: This invention provides a method to control the buffering of encoded video data organized as frames or fields. This method involves determining the picture number of each incoming decoded frame, determining the expected presentation number at any time and marking any buffer as ready when its picture number is on or after the presentation number.

Abstract: A method and system for automatically collecting and for analyzing information about time and work performed on a computer includes a hardware abstraction layer for monitoring activity on various user input devices. The system also includes the following elements: a data collector for monitoring certain portions of a user's computer activity and for logging into a log file those certain portions of a user's computer activity; a data analyzer for determining by following user-defined rules showing which portions of those certain portions of a user's computer activity constitutes continuous work activities, and how this work should be categorized by project and task with project; and an external interface for building the rules defining work. The data collector includes a resident module, such as a TSR (terminate-and-stay-resident) module, which extends the file system of the computer so that detailed records are kept of file activities.

Abstract: A configurable RAM interface connecting a bus to RAM is adapted to receiving large multiword variable length tokens at a high data arrival rate, using a swing buffer and a buffer manager. An address source provides complete addresses to the interface. The buffer manager has a state machine which transitions among a plurality of states, maintaining status information about the buffers, allocating the buffers for reference by a write address generator, clearing the buffers for occupation by subsequently arriving data, and maintaining status information concerning the buffers. The buffer manager also examines tokens of received data in order to update the status of the arrival buffer.

Abstract: The invention provides a single chip implementation of a digital receiver for multicarrier signals that are transmitted by orthogonal frequency division multiplexing. Improved channel estimation and correction circuitry are provided. The receiver has highly accurate sampling rate control and frequency control circuitry. BCH decoding of tps data carriers is achieved with minimal resources with an arrangement that includes a small Galois field multiplier. An improved FFT window synchronization circuit is coupled to the resampling circuit for locating the boundary of the guard interval transmitted with the active frame of the signal. A real-time pipelined FFT processor is operationally associated with the FFT window synchronization circuit and operates with reduced memory requirements.

Abstract: A multi-standard video decompression apparatus has a plurality of stages interconnected by a two-wire interface arranged as a pipeline processing machine. Control tokens and DATA Tokens pass over the single two-wire interface for carrying both control and data in token format. A token decode circuit is positioned in certain of the stages for recognizing certain of the tokens as control tokens pertinent to that stage and for passing unrecognized control tokens along the pipeline. Reconfiguration processing circuits are positioned in selected stages and are responsive to a recognized control token for reconfiguring such stage to handle an identified DATA Token. A wide variety of unique supporting subsystem circuitry and processing techniques are disclosed for implementing the system.

Abstract: A method for converting frame data at a slower rate into field data at a faster rate in a video decoder comprises determining a basic field repetition rate such that a field is repeated an integer number of times in a frame period, calculating a ratio differential of the repetition rate by subtracting from the speed-up ratio of the faster to the slower rate, the ratio of the fields per frame period to the slower rate, comparing the ratio differential with the differential of the field repetition rate and adding or subtracting extra fields when the two are substantially at variance.