Matsushita Electric Industrial Co., Ltd.

Takafumi Ueno

Masataka Nikaido

Sheng Mei Shen

Naoki Ejima

Tatsuya Adachi

Yasushi Nakajima

Kiyotaka Nagai

Shinichiro Ishii

Kenichi Takahashi

Zhongyang Huang

Yasuomi Shimada

Ming Ji

Junichi Komeno

Shiro Tsuji

Nobuyoshi Kihara

Tatsuo Fukuyama

Kanji Kakao

Jun Kimura

Jia Quan Yang

Hideshi Taki

Digital Rights Management (DRM) or Intellectual Property Management and Protection (IPMP) for generic digital content wherein a IPMP Control Graph and a REL-IPMP Control Graph carries protection signalling and rights expression data. Both content packaging and terminal processing relating to the above control graph are clearly defined and elaborated.

MPEG-21 digital content protection system

A transmission apparatus updates the encryption method in the event the encryption method is broken. The tool ID of a decryption tool for encrypted data is acquired, the presence of the tool is confirmed and the tool is then acquired and updated, and encrypted data is processed and transmitted based on rights information associated with the encrypted data.

Receiving apparatus

A method achieves high performance MPEG-2 video variable length decoding as to improve MPEG-2 video decoding process on the whole. The method includes parsing bits, Huffman code decoding for macroblock address increment, decoding motion code, and decoding macroblocks including intra and non-intra macroblocks. This is suitable to any application that are compliant with MPEG-2 MP@ML or MP@ HL video standard. For example, in PC-DTV receiver application, with properly configured PC, one can receive DTV program in real time.

Method of MPEG-2 video variable length decoding in software

First digital data ( ) obtained by encoding a low-resolution digital video signal at a low-resolution compression encoder ( ) and second digital data ( ) obtained by encoding a high-resolution digital video signal at a high-resolution compression encoder ( ) are multiplexed and transmitted with information relating to programs wherein identification information for identifying both digital data ( ) is described, and at a receiving ( ) side, the first and second digital data are identified on the basis of the identification information, and are reproduced by corresponding decoders ( ). Therefore, when image of different resolutions is transmitted by multiplexing, it is possible to reproduce data correctly at the receiving side, thereby increasing freedom in program composition.

Digital data transmission method, digital data transmission device and digital data receiving device

The image decoding apparatus includes first clock reproducing means for reproducing the first clock signal from a time stamp signal extracted from a digital transport stream , decoding means for decoding a digital video stream and outputting the first digital video signal synchronizing with the first clock signal and having the first frame frequency, graphic generating means , overlaying means for overlaying the first digital video signal and the graphic signal and outputting the first overlaid digital video signal synchronizing with the first clock signal , and digital-to-analog converting means for converting the first overlaid digital video signal into an analog signal , and an image without any missing frames or display disturbances can be provided even when the digital video signal and the graphic signal are displayed being overlaid.

Synchronization method of image decoder

A data transfer apparatus and a data transfer system intended to transfer data continuously input or output to/from a main memory without any interruption and to transfer continuous data on a general-purpose bus such as a PCI bus, and a recording medium storing a program that commands a computer to execute all or some of functions of each component of the data transfer apparatus or the data transfer system. If it is supposed that a capacity of a write buffer memory is CAPW, an input rate of continuously input data is T , and a maximum assumed value of an interval of bus access permissions issued by a CPU is TW, data omissions can be prevented by setting CAPW, T and TW at values that satisfy: CAPW&gE;TW&times;T

Data transfer apparatus, data transfer system and recording medium

A variable speed digital signal reproducing apparatus, particularly related to low speed reproduction of a digital signals recorded in a recording medium. The apparatus includes a unit for determining whether a reproduction PCM signal is renewed or not. Based on the renewal determination, PCM data of one frame is stored in a memory and the PCM data is read at a frequency rate corresponding to a tape reproducing speed at that time. Furthermore an interpolating device operates on the read PCM data to produce a PCM signal having the same frequency with which the PCM signal was read from the memory means.

Variable speed digital signal reproducing apparatus

This invention relates to a time code recording and reproducing apparatus for recording and reproducing time codes corresponding to a digital signal. Time code converting means (100) converts a first time code into a second time code. A frame phase which occurs during the recording of input information is determined by frame timing generating means. A phase difference between a frame of the second time code and a recording frame is detected by phase difference detecting means (103). Phase difference correcting means (104) outputs a third time code on the basis of the detected phase difference. The input information is recorded together with the third time code. Thereby, the recording can be performed while the relation of the correspondence between the input information and the time code is held. In addition, the reproduction can be performed.

Time code recording or reproducing apparatus and time code converter

A transducer such as used for an electro-dynamic loudspeaker adapted to convert an electric signal into a mechanical motion or, a moving coil type velocity sensor adapted to convert a mechanical motion into an electric signal. The so-called 'Bl force factor,' representative of the product of the magnetic flux density B and the length l of the main coil, is so controlled as to be made constant, whereby the linearity of the transducer is improved.

Transducer with flux sensing coils

A multi-way speaker system comprising a tweeter, a squawker and a woofer wherein each of the speakers is arranged in staggered relation along their radiating axis at a predetermined spacing from each other and provided with an appropriate crossover network coupled to an input terminal of each of the speaker whereby sound pressure-frequency characteristics of a synthesized sound wave resulting from the synthesis of respective sound waves radiated from respective speakers are rendered flat, and phase frequency characteristics of said synthesized sound wave are rendered linear, over an entire band to improve a waveform transmission characteristic of an overall speaker system.

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Nara, Japan

Takafumi Ueno