Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

U.S. Philips Corporation

Shinji Hamai

Chiyoko Matsumi

Akira Iketani

Yasunori Kawakami

Tatsuro Juri

Yoshihiro Morioka

Masao Okabe

Hiroshi Kase

Masazumi Yamada

Junji Yoshida

Hidetoshi Takeda

Fumikazu Imai

Masakazu Nishino

Takuya Nishimura

Hiroyuki Iitsuka

Hiroshi Mitani

Hideaki Takechi

Shiro Kato

Toshiki Yamamura

Tadashi Kunihira

Makoto Asano

Yasuyuki Sahara

Naohisa Motomura

Yasushi Kojima

Naonori Kato

Yuuzou Murakami

A transmission device, which continues consistent secure communication, even if a frame counter is reset due to a power cut off, includes a transmission frame counter that counts a value monotonically incremented for each packet transmission and holds the value as a frame counter value. The transmission device includes a transmission unit that adds the frame counter value held in the transmission frame counter to a packet, and transmits the packet to the reception device, and a storage circuit that stores the frame counter value. The transmission frame counter (i) stores the counted and held frame counter value into the storage circuit for each stored-frame-counter updating increment that is a natural number greater than an increment by which the frame counter value is monotonically incremented, and holds, as a new frame counter value, the stored frame counter value added with the stored-frame-counter updating increment, when the transmission device is reset.

Transmission device, reception device, transmission method, reception method, and transmission/reception system

To easily ensure that appropriate recognition information is used. A remote control system () includes a DVR () and a remote control () that controls the DVR () via a wireless communication path. The remote control () which is one apparatus out of the DVR () and the remote control () obtains, by a wireless reception unit (), recognition information used by the apparatus to uniquely recognize the other apparatus, via another communication path (a communication path through a TV ()) different from the wireless communication path connecting the apparatus and the other apparatus. When a connected apparatus recognized via the wireless communication path is identified by the obtained recognition information, the remote control () sets, by a control circuit (), the connected apparatus as the DVR () which is the other apparatus to enable communication with the connected apparatus.

Wireless control system

A communication apparatus with a memory () holding CA information A() including (i) a CA certificate A() indicating that an AP server certificate A() (that indicates the validity of an application server ()) is valid and (ii) a URL B() indicating the URL of a download server B() where CA information B() including the next valid CA certificate B() is stored. The communication apparatus also having a server authentication unit () verifying the AP server certificate A() using the CA certificate A(), and having a CA information update unit () obtaining the CA information B() from the download server B() indicated by the URL B(), wherein, when the CA certificate A() becomes revoked, the server authentication unit () authenticates the application server () using the CA certificate B() included in the CA information B() obtained by the CA information update unit ().

Communication apparatus and authentication apparatus

A communication system includes a device and a server connected to the Internet, which transfers communications between the device and a terminal connectable to the Internet via the server. The device periodically transmits a notice packet to the server. The server transmits a connection request packet to the device in reply to the notice packet when a transfer to the device is requested from the terminal. The device transmits a TCP connection request to the server when receiving the connection request packet from the server. The server accepts the TCP connection request transmitted from the device to the server in reply to the connection request packet, to establish the TCP connection. Thus, the server transfers communications between the terminal and the device on the TCP connection after the TCP connection is established.

Secured TCP/IP communication system for devices and private networks connected to the internet

A controller issues a command to an HDD interface to transfer AV data stored in HDDs to a memory. The HDD interface, in compliance with the command, transfers the AV data stored in the HDDs to a memory mapped on a bus. A memory controller reads the AV data out of the bus, and writes the AV data into the memory. The controller outputs the address of the AV data to be outputted to the memory controller. The memory controller reads out the AV data of the designated address, and outputs them to an AV data output interface. And the AV data output interface outputs the AV data. The controller issues a command to the HDD interface memory to record the AV data stored in the memory into the HDDs. The HDD interface, in compliance with the command, reads the data out of a memory mapped on the bus, and stores them in the HDDs. The memory controller reads the AV data out of the memory, and outputs them to the bus. At the same time, the controller designates to the memory controller the address in the memory into which the AV data inputted from the AV data input interface are to be written. The memory controller reads the AV data out of the AV data input interface, and writes them into the designated memory. By accomplishing this series of actions in synchronism with the frame period, AV data are stored in the HDDs, and also AV data stored in the HDDs are outputted.

AV data input/output device

An apparatus for recording and reproducing digital data according to the present invention, includes: a group converter; a controller; a recording converter; a recording unit; a reproducing unit; a reproducing converter; and a group reverse converter, wherein the group converter includes: a block management data generator for receiving the management data from the controller and generating block management data with respect to the corresponding blocked data, the block management data having a variable-length and containing information concerning each blocked data; a group management data generator for receiving the management data and generating group management data containing information concerning the entire grouped data; and a grouped data generator for receiving the blocked data, the block management data, and the group management data, and generating grouped data by arranging the blocked data, the block management data, and the group management data in a predetermined order.

Apparatus for recording and reproducing digital data and method for the same

The present invention relates to a data recorder which chronologically records continuous data such as image data without interruption at high speed, a medium which stores the procedure of recording or reproducing in the data recorder as a program, and a method of accessing the data recorder. In one embodiment, the data recorder is equipped with a group of recording units, and each group unit has a SCSI adaptor and a hard disk. The hard disk is connected to the SCSI bus and the SCSI adaptor is connected to a PCI bus. With this construction, data to be recorded in the data recorder is split into units of a prescribed size and assigned and recorded on the group of recording units so as to utilize a plurality of hard disks as a single logical recording space.

Data recorder and method of access to data recorder

A packet output device for formatting serial data into packets and for transmitting resulting data packets includes a data packet generator for generating each data packet and for generating time data corresponding to the data packet, the time data defining an output time of the data packet, and a packet transmitting circuit for receiving the data packet and the corresponding time data and transmitting the data packet based on the corresponding time data.

Packet output device and packet output method

When modulating by an interleaved NRZI technique by inserting one bit per every m bits of input data series, the frequency characteristics of bit rows varying by the polarity ('0' or '1') of the bit to be inserted are compared, and the bit row closer to the desired frequency characteristic is selected as the output series, so that recording is effected by controlling the frequency characteristics of the digital signal.

Apparatus for recording digital signals by controlling frequency

A method for transmitting data when a system detects the amount of data which can be transferred, and divides the data to be transferred into a plurality of data blocks to form a list. A transfer device refers to the list and carries out input and output processing between a VTR or a network and a memory. Thus, the data can be efficiently transmitted at high speed with high reliability and independent of system configuration. Additionally, the data can be rearranged in the course of its transmission.

Method for transmitting data, and apparatus for transmitting data and

The video signal input is converted to high-speed reproduction data by a high-speed reproduction data encoder 1. The video signal input is converted to high-speed reproduction data by a formatter 2, which formats the high-speed reproduction data so that the same data is recorded to n tracks. After the recorded data is input to an error correction encoder 3, it is decoded by a decoder 4 and recorded by a recording head 5 to the magnetic tape 6. During reproduction, the recorded data is reproduced by reproduction head 7 from the magnetic tape 6, and decoded by decoder 8. The decoded data is then error corrected by an error correction decoder 9, and then input to a deformatter 10. The deformatter 10 separates the normal reproduction data from the high-speed reproduction data, and separately outputs both data types. During normal reproduction, the normal reproduction data is output by a switch 13; the high-speed reproduction data is decoded to video data by a high-speed reproduction data decoder during high speed reproduction, and output.

Television signal recording and reproducing apparatus

Input digital data are formatted into a data block composed of a predetermined amount of data, subjected to error correction encoding process, and recorded on a predetermined number of continuous tracks of a recording medium. In the error correction encoding process, the data block is subjected to an inter-track error correction encoding, an outer error correction encoding and an inner error correction encoding. In the inter-track error correction encoding, each information element to be coded is produced by symbols collected from the data which are to be recorded on different tracks of the continuous tracks. The error correction encoded data in the data block are distributed to a first predetermined recording area of each track of the continuous tracks, and parity code words produced by the inter-track error correction encoding are distributed to a second predetermined recording area of each track of the continuous tracks.

Growing community of inventors

Osaka, Japan

Shinji Hamai