Sony Corporation

Shinichi Kazami

Yoichiro Sako

Masato Tanaka

Tatsuya Inokuchi

Kazuyoshi Takahashi

Toshitada Doi

Takashi Kihara

Tadashi Ohtsuki

Shinji Anjyu

The present invention relates to a system for verifying data recorded on an information recording medium. The system includes a data reproduction unit for reproducing data recorded on an information recording medium, a reproduction-verification-data generation unit for executing a calculation based on the data reproduced by the data reproduction unit to generate reproduction verification data, and a data comparison unit for comparing the reproduction verification data with recording verification data, which is obtained by executing a calculation based on data to be recorded on the information recording medium.

System, method, and computer program for verifying data on information recording medium

A processing apparatus for transmitting electronic information on copyrighted work, which has a predetermined amount of data, with an electronic signature being added thereto, includes division-processing device which divides the electronic information on copyrighted work into at least two parts, electronic-signature-operating device which operates to add the electronic signature for every part of the electronic information on copyrighted work divided by the division-processing device, and information-transmitting device which synthesizes the electronic information on copyrighted work to which the electronic-signature-operating device operates to add the electronic signature and electronic signature information for determining whether the electronic signature is legitimate and transmits the synthesized information.

Information-processing system and method, information-transmission-processing apparatus, and information-reception-processing apparatus

When encoded data is divided every predetermined length, a header is added, the data is packetized, a header is further added to thereby form pack data, and the data is recorded onto a recording medium which is divided into sectors and can be accessed on said sector unit basis, encode units are stuffed and recorded into each packet and a position of a complete encode unit existing at the head of the sector is indicated by a pointer. If the pointer is used, the position of the encode unit serving as a complete encode unit is known, so that the decoding can be immediately started from the head of the encode unit. A length up to the head of the complete encode unit can be specified by the sector number if the encode unit is determined by a fixed length.

Data recording method and apparatus, data reproducing method and apparatus, and data edition method and apparatus

Optical discs on which enciphered data is recorded include first recording areas, where enciphered contents data is recorded, and second recording areas provided at the position where a read-out operation is carried out ahead of the first recording areas and including a first area portion, where cipher key data for decoding enciphered contents data is recorded, and a second area portion, where identification data for identification of the recording medium modulated by a modulation system different from that of at least the first area portion is recorded.

Data recording medium, recording medium recording and/reproducing apparatus, and recording or reproducing method

In a method and apparatus for editing digital signals, such as PCM-encoded audio signals, which are helically recorded on a magnetic tape in a Video Tape Recorder, first and second digital signals to be edited are reproduced in order to determine the respective edit points, and a predetermined interval of either one of the first and second digital signals is stored in a memory, with such predetermined interval including the respective edit point. During an editing operation, the digital signals from the memory are inserted between the first and second digital signals, and thereby the first and second digital signals can be recorded on an editing tape without discontinuities at the desired edit points.

Method and apparatus for editing digital signals

Digital signals consisting of sets of simultaneous bits have an error-correcting signal encoded into them by adding an error-correcting bit to each set. The sets thus enlarged are referred to as digital words. The digital signals are then converted from simultaneous, or parallel, form to serial, or sequential, form and the digital words from a block of several digital signals at a time are interleaved in such a way that corresponding words from each of the digital signals in the same block are placed in immediate sequence. Prior to adding the error-correcting bits error-detecting bits can be added to the original bits in intersecting sets can that intersect the first-mentioned sets in row by column relationship, and parity bits can also be formed simultaneously with the formation of the error-correcting bits as extensions of the intersecting sets. In decoding the resulting signals, changes in the bits forming one word of each digital signal can be directly corrected, and additional errors can be detected and minimized by forming mean value signals of digital signals that immediately precede and follow the erroneous digital signal or by retaining the preceding digital signal until the succeeding signals return to correct or correctable form.

Growing community of inventors

Kanagawa, Japan

Shinichi Kazami