Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Nippon Hoso' Kyokai

Yasunori Kawakami

Shinji Hamai

Tatsuro Juri

Akira Iketani

Hiroyuki Iitsuka

Masao Okabe

Chiyoko Matsumi

Takuya Nishimura

Hidetoshi Takeda

Hidekazu Tanigawa

Tsutomu Mikami

Takumi Ikeda

Hiroshi Taniyama

Masazumi Yamada

Toshihiro Uehara

Haruo Isaka

Kei Ichikawa

Makoto Goto

Yasuyuki Sahara

Mikio Fujiwara

Tetsuya Mizushima

Hotaka Minaguchi

Sigekazu Togashi

Yoshiki Yamamoto

Yuuzou Murakami

A transmission and reception system includes a transmission apparatus and reception apparatuses. The transmission apparatus transmits a storage identifier for identifying a storage medium and data. The reception apparatuses each include a receiving section for receiving the storage identifier for identifying the storage medium and the data, and a storage control section for storing the data received by the receiving section on the storage medium identified by the storage identifier received by the receiving section. Hence, automatic storage of data conforming to personal taste and simultaneous automatic storage of data for plural persons are realized.

Transmitting and receiving system, transmitting apparatus and receiving apparatus

A transmission and reception system includes a transmission apparatusand reception apparatusesand. The transmission apparatustransmits a storage identifier for identifying a storage medium and data. The reception apparatusesandeach include a receiving section for receiving the storage identifier for identifying the storage medium and the data, and a storage control section for storing the data received by the receiving section on the storage medium identified by the storage identifier received by the receiving section. Hence, automatic storage of data conforming to personal taste and simultaneous automatic storage of data for plural persons are realized.

In a data transmission apparatus for transmitting digital video and audio data, a block forming circuit forms a plurality of data blocks of transmission data composed of at least one of digital video data, digital audio data, and digital auxiliary data related to the digital video data and the digital audio data. Thereafter, a grouping circuit groups a plurality of data blocks outputted from the block forming circuit so as to form transmission group data of one transmission unit block having a time length of approximately one three-hundredth second, and then transmits the transmission group data. Further, a classifying circuit preferably classifies the transmission group data into a plurality of sections, by adding section identification data to each transmission group data.

Data transmission apparatus for transmitting digital video and audio data between respective audio visual apparatuses, and method therefor

The present invention relates to a method to handle dummy blocks without real data in a file management system. More specifically, block allocation means,is provided with a function of counting the number of dummy blocks without real data when there is a request to write new data at a file offset address one or more blocks away from the last file offset On in a specific file, and the unoccupied block management means,is additionally given a function of managing the number of unoccupied blocks subtracting the number of dummy blocks from the number of unoccupied blocks. That always leaves the number of unoccupied blocks with the number of the necessary blocks subtracted therefrom. The blocks necessary for later writing can be secured.

File management system and file management method capable of managing unoccupied blocks without the use of dummy data

The present invention relates to a file system using a disc memory storage and a method of managing the file system. Just like the ordinary server, a first block table Tb,with the offset number of the file to be written in matched with the block number Dij of the data block is provided, and the data stored in the memory is read out on the basis of the contents of the first block table Tb,On that file system, a second block registering means is provided which couples the block number allotted to the file to write and the offset number and, in case of consecutive block numbers, prepares a second block table Tb,in which the first block number of the consecutive block numbers is paired with the offset number. A second take-out means is also provided. When consecutive data are to be read out, the second block take-out means arithmetically processes, on the basis of the contents of the second block table Tb,the block numbers Dij to be read out and hands over the results to the data read-out means. That substantially reduces the access and processing time for read-out at the block table and makes the reading out of data highly efficient.

File system and file management 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

The transmitting device latches the time of the absolute clock when the V-sync signal of the video signal block is transmitted, adds to the latched time a predetermined delay time equivalent to the sum of the time required for the transmitting device to process the video signal block and the time required for the transmittance; and transmits the resulting sum value together with the video signal block. The receiver extracts the sum value and produces the V-sync signal delayed by said predetermined delay time.

Transmission apparatus and receiving apparatus

Data transmission apparatus for transmitting digital video and audio

A digital signal recording apparatus for recording digital signal in synchronization blocks includes a generator for generating a synchronization pattern for indicating the beginning of each synchronization block, a generator for generating an ID data for indicating the sequence of the synchronization blocks, a generator for generating an ID parity for checking the ID data, a generator for generating additional information signal, which is a track width data, a generator for generating audio and video signals. Above data are applied to a pattern generator for generating track data comprising plural consecutive normal synchronization blocks immediately preceded by two mini-synchronization blocks and immediately followed by one mini-synchronization block. Each mini-synchronization block includes the synchrionization pattern, ID data, ID parity, and additional information signal. Each normal synchronization block includes the synchronization pattern, ID data, ID parity, and audio and video signal.

Apparatus and method for recording and reproducing digital signal in

A data transmission system suitable for effectively transmitting variety of data such as NTSC, PAL, and MPEG between various devices connected to a bus includes a data block generator generates a data block and a discrimination data identifying the generated data block from the source data. A data header generator generates a data header based on the discrimination data. A packet generator and an interface block generates a packet header and CRC error codes to compose a packet with thus generated data block and header.

Digital data transmission system including a device for data block,

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 superposed with controlled

An apparatus serving as a digital videocassette recorder (VCR) for recording analog video and audio signals as digital signals. The apparatus serves also as a digital data storage drive. The digital VCR and the storage drive share common circuitry and a common magnetic recording medium. This reduces the cost and enhances the efficiency at which tracks are used. The apparatus has a large storage capacity. The apparatus divides input digital data into two parts and performs error correction encoding for each of these two data parts to form sync blocks. These sync blocks are recorded in an audio signal recording area and a video signal recording area, respectively, on the recording medium. Error correction codes used during reading of digital data are the same as those used during recording of video and audio signals. The same track structure and the same sync block structure are used for these two modes of operation.

Apparatus for recording and playing back digital data

The data transmission method employs IEEE P1394 protocol. The data header of the transmitted isochronous packet is added with a node identifier identifying the transmitter node, so that the receiver node can immediately identify the transmitter node, and can thereby request the transmitter node to maintain transmission. A Broadcast channel is a default channel used for isochronous packet transmission, unless a different channel number is otherwise specified. Thus, it is not necessary for the user to coordinate the channel number used by the transmitting and receiver nodes. It is also not necessary for the transmitter node to notify the receiver node, or the receiver node to notify the transmitter node, of the channel number used.

Data transmission system and method

A pilot signal is superposed and recorded on data at the beginning of each track. The beginning portion of the track is constituted only of codewords having a disparity of each 10 bits which is +2, 0 or -2. Also, the cumulative value of the disparities of every 10 bits may fluctuate in a period coinciding with the period of the pilot signal to be superposed. Therefore, the frequency spectrum in the beginning part of the track has a peak at the frequency of pilot signal, and using this peak as the pilot signal, tracking is controlled during reproduction.

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Osaka, Japan

Yasunori Kawakami