Sony Corporation

Hirofumi Todo

Makoto Yamada

Masahiro Shigenobu

Kenichiro Aridome

Kazuo Watanabe

Koji Inoue

Keiji Kanota

Ryogo Ito

Masaharu Tokuhara

Katsuhiko Watanabe

Kenichiro Imai

Takaya Hoshino

Toshio Sarugaku

Kensuke Fujimoto

Junichi Yokota

Fumihiko Kaise

Hiroshi Shimono

Ko Kobayashi

Kunihiko Take

The present invention is a recording method for recording, data to a disc shaped record mediumcorresponding to a hierarchical file system, the method comprising the steps of recording management information for managing a hierarchical structure of the file system to a particular areaof the disc shaped record medium, treating an unused area of the particular areaas a particular file, and recording information with respect to an initial location and an initial length of the particular file and information with respect to a current location and a current length of the particular file to the particular area

Recording method, recording apparatus, and record medium

A recording device which records data onto a recording medium includes a nonvolatile memory storing and holding data on a free capacity of the recording medium, and a control unit controlling the data recording. The control unit determines the free-capacity data stored in the nonvolatile memory based on the total capacity of the recording medium when power is turned on. When the determination result indicates that a value of the free-capacity data stored in the nonvolatile memory does not exceed a value of the total capacity of the recording medium, the control unit records the data onto the recording medium with reference to the free-capacity data. When the power is turned off, the control unit updates the free-capacity data so as to reduce the value of the free-capacity data by as much as an amount of the data recorded onto the recording medium.

Recording device, recording-medium-management method, program of recording-medium-management method, and recording medium recording program of recording-medium-management method

The present invention is a recording method for recording data to a disc shaped record mediumcorresponding to a hierarchical file system, the method comprising the steps of recording management information for managing a hierarchical structure of the file system to a particular areaof the disc shaped record medium, treating an unused area of the particular areaas a particular file, and recording information with respect to an initial location and an initial length of the particular file and information with respect to a current location and a current length of the particular file to the particular area

Recording method, recording apparatus, and recording medium

A method of recording data to a disc shaped record medium is provided where the data corresponds to a hierarchical file system. In the method, management information for managing the hierarchical structure of the file system is recorded to a predetermined area of the disc shaped record medium. An unused area of the predetermined area is treated as a file.

Recording method, recording apparatus, and record medium for recording data corresponding to a hierarchial file system

A system for recording data to a disc shaped record medium. The data is recorded according to a universal disc format employing a hierarchical file system, and data within the hierarchical structure is referenced using pointer information. The pointer information includes a file identifier descriptor and a file entry and is recorded such that the pointer information and its corresponding substantive data are stored at successive addresses.

Disc recording scheme for enabling quick access to disc data

A data access controller has its SRAM adapted to hold two ECC blocks so that the SRAM is used efficiently for multiple kinds of processes. At playback of data, writing of ECC block A from the demodulator and the ECC process for ECC block B begin simultaneously. When the ECC process ends, release of the ECC block B to the outside begins. When the writing of the ECC block A ends, the ECC process for the ECC block A begins and, at the same time, writing of ECC block B from the demodulator begins.

Data access controller and data access control method

A storage medium reproduction apparatus for reproducing data from a storage medium for storing data which are divided into frames of a predetermined length, each of the frames comprising a synchronizing pattern. The apparatus comprises a synchronizing pattern detection circuit for detecting synchronizing patterns and a frame determination circuit for determining a currently reproduced frame on the basis of regularity of the synchronizing patterns detected by the synchronizing pattern detection circuit.

Error-correcting storage medium reproduction apparatus and method using

A data access controller has an SRAM adapted to hold two ECC blocks so that the SRAM is used efficiently for multiple kinds of processes. At playback of data, writing of ECC block A from a demodulator and an ECC process for ECC block B begin simultaneously. When the ECC process ends, release of the ECC block B to the outside begins. When the writing of ECC block A ends, the ECC process for the ECC block A begins and, at the same time, writing of ECC block B from the demodulator begins.

In equipment for transmitting data and a method for transmitting data according to the invention, main and subordinate modulated data to be used for recording are provided in time division, and a dc level is calculated in advance. The dc level is suppressed on the basis of the calculation result of the dc level, and a modulating data is thereby generated with the dc level suppressed. Thus, the equipment and method according to the invention can be applied to, for example, an optical disc drive and the total construction can be simplified. The circuit blocks for transmission systems can be used in common with different systems.

Equipment for transmitting data and method of the same

A window signal generating circuit generates a window 1 signal in synchronization with a reference counter and generates a window 2 signal by inverting the window 1 signal. If a detected synchronizing signal detected by a synchronizing signal detecting circuit is synchronized with a window 1 signal, a resynchronizing signal output circuit outputs a resynchronizing signal in synchronization with the window 1 signal. If a window 1 signal and a synchronizing signal are not synchronous, that is, if a window 2 signal is at a high level and a synchronizing signal is detected, another reference counter is synchronized with the synchronizing signal, and if a synchronous state continues by a predetermined frequency or more, the reference counter is synchronized with the timing of another reference counter. A synchronizing signal can be promptly fetched by the above processing.

Method for regenerating synchronizing signal by judging whether or not

A plurality of circuit blocks that output digital signals with different sampling frequencies are connected to data buses in common. One of outputs of the circuit blocks is selected and the output is sent to a sampling rate converter circuit block through the data buses. Each of the circuit blocks has a tri-state buffer at its output stage. With an output enable signal, a desired circuit block can be selected.

Sampling rate converting system for converting the sampling rate of a

A level detection circuit includes a multiplier and an adder for computing the sums of square values of a burst signal. A maximum value holding circuit holds a maximum value of the sums of the squared values of the burst signal. A counter counts sampling clocks. A multiplier, an adder and a 1/2 processing circuit compute a half value of the sum of two consecutive count values, and a delay circuit, a latch circuit and a comparator generate a first one of the two consecutive count values as a level of the burst signal when an output of the 1/2 processing circuit becomes larger than the output of the maximum value holding circuit. The invention enables level detection by finding a square value using a small circuit.

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Tokyo, Japan

Hirofumi Todo