The present invention provides a disk drive apparatus for use in computer systems and especially in computer systems where size and weight are of paramount concern, such as lap top computer systems. The preferred embodiment of the disk drive apparatus includes a 21/2" magnetic disk that preferably provides 20 to 40 megabytes of storage within a foot print area of approximately 2.8 inches by approximately 4.0 inches. Further, the disk drive apparatus possesses a height dimension of 0.630 inches or less. This height dimension is achieved, in part, by providing a low profile spin motor to rotate the magnetic disk. The low profile spin motor uses high energy magnets that are preferably made of a material that includes a rare earth, such as neodymium or samarium. The disk drive apparatus also employs a rotary actuator having a voice coil assembly of reduced height that is achieved by using the housing as a flux return path for magnet fields produced by the voice coil assembly. The present invention also provides an improved ambient filter that reduces the penetration of ambient water vapor into the housing of the disk drive apparatus. An improved desiccant located, at least in part, within the housing is also provided by the present invention. Additionally, the invention provides a flex circuit having a geometry that results in substantially zero torque applied to the rotary actuator. Also provided is a distributed frame apparatus that, besides connecting the housing to a printed circuit board, also provides side, top and/or bottom mounting capability and shock absorbing capability. The distributed frame also avoids the need for grounding.

Disk drive apparatus

A magnetic disk cartridge including a flexible magnetic disk, a hub, disk-holding protrusions, and an anti slip-out member. The hub has a disk-holding surface on which the central portion of the magnetic disk is held. The disk-holding protrusions are formed on the disk-holding surface of the hub, and are inserted through holes formed in the magnetic disk. The anti slip-out member is used to prevent the magnetic disk from slipping out from the disk-holding protrusions.

Magnetic disk cartridge

The present invention describes an image decoding apparatus for inputting a compressed-coded bit stream obtained by performing motion compensation prediction per coded unit-area obtained by dividing each frame of a motion image signal into plural units, and decoding the input compressed-coded bit stream to a motion image signal by referring to reference images stored in a frame memory, whereby the image decoding apparatus comprises a decoder decoding the compressed-coded bit stream to a motion vector, a prediction mode and a decoded images corresponding to the coded unit-area as a unit of the motion compensation prediction, and further comprises a frame memory storing controller for controlling update of the reference images to be used for the motion compensation prediction stored in the frame memory based on a control signal, wherein the frame memory storing controller updates the reference images successively with an image that is based on the decoded image output by the decoder, and the frame memory storing controller writes an image that is based on the decoded image output by the decoder into the frame memory as a continuously storing image that stored independently of storage by the updating procedure based on the control signal, further comprising a motion compensation predictor generating a prediction image based on the motion vector by referring to one of the reference images updated by the control of the frame memory storing controller based on the prediction mode decoded by the decoder.

Image encoding apparatus and image decoding apparatus

A magnetic recording disk cartridge comprises a recording disk and a causing for accommodating the recording disk. The cartridge is provided with a shutter member for closing the magnetic head receiving openings in the casing. The shutter member is mounted in the casing for pivotal movement along the inner surface of the casing between an operative position in which it closes the magnetic head receiving opening and an inoperative position in which it opens the same. The shutter member is provided with projections on the surface facing the inner surface of the casing and slides on the projections along the inner surface of the casing when it is moved between the operative position and the inoperative position.

Magnetic recording disk cartridge

The present invention relates to a method for conducting interlayer motion prediction in encoding or decoding of video signal. The present method sets motion information of an intra-mode macro block of a base layer with motion information of an inter-mode macro block that is vertically adjacent to the intra-mode macro block, derives motion information of a pair of macro blocks adjacent vertically each other from the two macro blocks, and uses the pair of macro blocks in inter-layer motion prediction.

Inter-Layer Prediction Method for Video Signal

A digital video signal that has been encoded using motion-compensated prediction, transform encoding, and variable-length coding, is decoded using parallel processing. Frames of the video signal are divided into slices made up of a sequence of macroblocks. The signal to be decoded is slice-wise divided for parallel variable-length decoding. Each variable-length-decoded macroblock is divided into its constituent blocks for parallel inverse transform processing. Resulting blocks of difference data are added in parallel to corresponding blocks of reference data. The blocks of reference data corresponding to each macroblock are read out in parallel from reference data memories on the basis of a motion vector associated with the macroblock. Reference data corresponding to each macroblock is distributed for storage among a number of reference data memories.

Apparatus and method for reproducing a prediction-encoded video signal

A floppy disc is contained in a relatively hard encasement. In order to improve the function of a cleaning sheet installed in the floppy disc cassette encasement, a flexible pressure member is provided on an inside of the cassette which presses a portion of the cleaning sheet against the recording surface of the floppy disc.

Flexible magnetic disc cassette

A disk-shaped recording medium has a control record region in each recording region of successive recording tracks and which is divided into a first preformat region, a second preformat region and a focusing servo region arranged in succession in the direction along the respective track and respectively providing traverse data, tracking and clock data, and focusing servo data. An apparatus for reproducing data recorded in the tracks of such disk-shaped recording medium samples a playback output from an optical head scanning a track to detect focusing data from the focusing servo region and tracking data from the second preformat region and, in response thereto, applies focusing servo or tracking servo to the optical head. Further, traverse data is detected in the first preformat region to effect traverse counting of the recording tracks.

Disk-shaped recording medium and apparatus for recording and/or reproducing data thereon

The horizontal address and the vertical address on a picture image are arrayed at the lower and upper order sides, respectively, and allocated to a lower order side column address and an upper order side column address of the synchronous DRAM employed as a picture memory (20), respectively. A bank switching address is allocated between the upper most bit of the horizontal address and the lower most bit of the row address to enable data to be read continuously to achieve high-speed accessing and improve the utilization efficiency of the data bus.

Moving picture decoding device.

PURPOSE: To open or shut a window through the movement of a shutter in any case, by providing a lock means of the shutter for a position where the shutter is not activated in the process of movement of the shutter automatically and activated only when the shutter is moved manually, and using the difference of strokes of automatic and manual operations. CONSTITUTION: A shutter 7 is provided with a hole 9 which is always energized in the direction to close a window 2 and is latched with a latch piece 4 of the cassette shell 1, and a notch 10 latching the shutter 7 in the process of movement of the shutter 7 automatically. In moving right the shutter 7 with a hand and latching the latch piece 4 and the hole 9, an open hole 8 of the shutter 7 and the window 2 of the cassette shell 1 are overlapped and a floppy disc 6 is exposed. In the process of loading/unloading of the cassette, the movement of the shutter 7 switching the window automatically is locked with a latch means consisting of the notch 10. COPYRIGHT: (C)1983,JPO&Japio

Hiroshi Sumihiro

Papers

Apparatus and method for reproducing a prediction-encoded video signal

Flexible magnetic disc cassette

Disk-shaped recording medium and apparatus for recording and/or reproducing data thereon

Moving picture decoding device.

Floppy disc cassette