Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Tsukasa Yoshiura

Yuji Nagaishi

Toshiharu Koshino

Toshiki Yamamura

Noriaki Wakabayashi

Yasushi Ayaki

Ryosuke Shimizu

Hiroshi Mitani

Toshio Inaji

Hiromi Onodera

Shinichiro Takigawa

Tetsurou Takaoka

Mitsuaki Oshima

Toshikazu Koudo

Shuichi Yoshida

Kiyoshi Masaki

Yoshitaka Yaguchi

Junichi Yasui

Junichi Komeno

Michiro Tanaka

Mitsuo Tokura

Takumi Matsuura

Noriaki Wakabashi

Toshihiko Maruoka

Satoshi Tan

A network hardware device of the invention includes a reception section receiving data from a network, and outputting a reception completion signal, a timer section measuring a preset time, and a delay section generating an interrupt signal so as to notify a host CPU of completion of the reception. When the timer section does not measure a time, the delay section generates an interrupt signal upon reception of the reception completion signal. On the other hand, when the timer section measures a time, upon reception of the reception completion signal, the delay section generates an interrupt signal after the timer section measures a preset time.

Network hardware device

A data recording device, using a disc, wherein it is easy to handle respective audio signals independently and which receives digital data got by multiplexing plural audio signals is provided. In a data recording device according to the present invention data blocks are identified in the frame unit from among received digital data and, at least, the first audio block and the second audio block are generated from among the data blocks so that each audio block is recorded from the leading address of the recording segment formed on the disc.

Data recording method and data recording device using same

An data recording apparatus in accordance with the present invention is configured so as to determine whether a received data block is of the same data to a previously received data block or not on the basis of the data block particular information in the data block transmitted from the outside and stored in a buffer thereby determining the recording-or-not into a disk drive, or so as to determine whether it is to be recorded into the disk drive or not on the basis of the information transmitted from the outside.

Data recording apparatus and data recording method

A video and audio data converter capable of insert-edit-processing another video data and audio data in real time while reproducing produced video and audio data and a disk apparatus using the video and audio data converter are configured so that a plurality of video and audio data input and output from a plurality of external apparatuses to video and audio input/output sections are input and output while the video and audio data input and output to one video and audio input/output section is replaced with the video and audio data input and output to another video and audio input/output section in a video and audio data conversion section.

Image/voice data conversion device and disk unit using it

Disk apparatus, video/audio data processor, and video/audio control method that detect audiovisual frame information to control output

In a disk control apparatus according to the present invention, after overwriting processing or block erasure processing is performed, index information on the fragmented recorded area is newly generated for managing the recording area, and recording start and end information is written to the video and audio data recorded on a disk apparatus, and edit processing can be easily performed by the disk control apparatus even after video and audio data recorded on the disk apparatus is overwritten with externally input video and audio data and after a part of the video and audio data is erased.

Disk control apparatus dividing a recording area into recorded and unrecorded areas

A storage apparatus has input means for inputting an input/output execution time prediction request from an external system and determining means for predicting the execution time of the input/output request in response to the input/output execution time prediction request. The storage apparatus predicts the execution time of the input/output request and provides a response to the external system in response to the input/output execution time prediction request input from the external system.

Storage management based on predicted I/O execution times

The present invention is a magnetic disk apparatus which is provided with means for dividing a large amount of data such as video data into segments with error correction code added thereto and further dividing the data including the error correction code into recording segments, while being capable of efficiently correcting errors even for a sector size of large unit and processing sectors of variable length.

Magnetic disk apparatus

The head driving apparatus of the present invention is composed of the following units. A head-provided carriage which moves in a straight line; a plurality of coils fixed on the carriage; a multipolar magnet whose polarities are alternated along the passage for the coils; a ferromagnetic stator yoke for fixing the magnet; a position sensor for detecting a position of the carriage, and a driving circuit for generating a function signal for each coil which corresponds to a detected carriage position, based on the distribution of the magnetic flux to be formed by the multipolar magnet, and then supplies the current to the coils based on the function signal.

Disk head driving device using linear activator with multipolar magnets

A disk-shaped recording medium includes a transparent substrate, and an optical recording layer and a magnetic recording layer formed at one side of the transparent substrate. An optical head applies light to the optical recording layer from a light source via the transparent substrate, and focuses the light on the optical recording layer and reproduces information from the optical recording layer. A magnetic head records information on the magnetic recording layer or reproduces information from the magnetic recording layer. An optical head moving device serves to move the optical head by a movement amount so as to focus the light on an optical track on the optical recording layer which has specified address information. A magnetic head moving device serves to move the magnetic head to a specified magnetic track on the magnetic recording layer by referring to the movement amount of the optical head.

Recording and reproducing apparatus with varying amounts of data in

In the head positioning apparatus of a disk-shaped information recording medium using the sector-servo-method, track codes are recorded in advance so as to be repeated every 12 tracks in the servo sectors of the disk-shaped information recording medium, the track are reproduced with a head, and a distance between the current position of the head and a target track is detected from the reproduced signal of the track codes with a resolution of 1/2.sup.7 of track width, then the head is moved to the target track so as to decrease the distance, when the head reaches the range of the width of .+-.6 tracks of the target track, an expanded head position signal having the resolution of 1/2.sup.7 is generated, and the head is controlled on the basis of the expanded head position signal and is finally settled to the target track.

Resolution enhancement of absolute track position using iterative

Track codes are recorded in advance so as to be repeated every 12 tracks, and burst signals .alpha. and .beta. are also recorded in advance so as to be repeated every 2 tracks, in the servo sectors of the disk-shaped information recording medium; the track codes and the burst signals .alpha. and .beta. are reproduced with a data head, and a distance between the current position of the data head and a target track is detected from the reproduced signal of the track codes with a resolution of 1/2.sup.2 of track width, then the data head is moved to the target track so as to decrease the distance; when the data head reaches the range of the width of .+-.6 tracks of the target track, an expanded data head position signal having the resolution of 1/2.sup.2 is generated; and thereby the data head is controlled.

Plural reserve servo sectors are provided to the outside of the outside and inside circumferences of the data recording track area of a sector servo type magnetic disk. Plural reserve tracks are likewise provided in this area. Using these reserve servo sectors and tracks, the position of the magnetic head is recognized even if the head skips outside the data recording track area due to magnetic head overshoot during track access, and seek errors are quickly determined and the disk re-accessed if the magnetic head is positioned in the reserve track due to a seek error or other cause. Sectors to which data relating to the protection of the magnetic disk itself or to the data files written to the data recording track area of the disk are also provided in the reserve tracks, and these sectors are referenced for data protection.

Magnetic disk having reserve servo sectors and plural reserve tracks

A position control system is disclosed for positioning a stepping motor to a target position according to a closed loop control system. The closed loop control system controls the position of the stepping motor according to a current position signal outputted from an encoder operatively coupled to the stepping motor. Furthermore, circuitry is provided for correcting electrically a torque angle error of the stepping motor caused by a positional error between the stepping motor and the encoder due to a mechanical mounting error of the encoder, to thereby drive the stepping motor at a torque angle maintained at the most desirable range.

Position control system

A data transducer position control system for data disk storage drive system involves an electronically and mechanically improved method and apparatus for position control of the data transducer adapted to write and/or read information data in and/or from the data tracks provided on a data disk. Particularly, the system comprises a positioning device for actuating the data transducer, a position encoder for detecting the position of the data transducer, a tracking error detector for detecting the relative position of the data transducer to the selected data track, and compensating position calculator for precise tracking so that the speed-up of track access can be effected, that the accuracy in positioning can be improved, that the system itself can be compact in size and reduced in energy consumption, and that the control electronic system can also be simple in arrangement.

Growing community of inventors

Hirakata, Japan

Tsukasa Yoshiura