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公开(公告)号：AU761944B2
公开(公告)日：2003-06-12
申请号：AU3457200
申请日：2000-03-31
Applicant: SONY CORP
Inventor： EZAKI TADASHI , IGA AKIRA , SATO HIDEO
Abstract: The present invention relates to a signal processing apparatus and method that is effective in protecting the copyright of a digital signal. More specifically, the present invention provides a signal processing apparatus for detecting whether or not a digital signal has been subjected to a compression process, the signal processing apparatus being characterized by including storage means for storing a first amount of information used as a reference for detecting whether or not a digital signal with electronic watermarking information embedded therein has been subjected to the compression process, the first amount of information being the amount of the electronic watermarking information, extraction means for extracting the electronic watermarking information contained in digital signal to be detected; and detection means for detecting a second amount of information that is the amount of the electronic watermarking information extracted and comparing the first amount of information with the second amount of information to detect whether or not the digital signal to be detected has been subjected to the compression process. This enables detection of whether or not a digital signal with electronic watermarking information embedded therein has been compressed.
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公开(公告)号：CA1119729A
公开(公告)日：1982-03-09
申请号：CA325325
申请日：1979-04-11
Applicant: SONY CORP
Inventor： IGA AKIRA , DOI TOSHITADA
Abstract: Blocks of digital words containing an error correcting word are time interleaved into time-interleaved blocks of words, each of which contains no more than one word from any one of the original blocks. The time-interleaved blocks of words are converted to a bit-by-bit serial digital data stream which is time-base compressed to permit insertion therein of an error detecting code word and synchronizing signals. The resulting serial data stream may be recorded on a VTR. After reproduction, each time interleaved block is checked for errors and is then time de-interleaved to reconstruct the original blocks of digital words. If one or more errors exist in words in a time-interleaved block, no more than a single word in any one of the time de-interleaved blocks contains an error. Single-word errors in a reconstructed block are corrected using the error correcting word accompanying the reconstructed block.
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公开(公告)号：CA1183620A
公开(公告)日：1985-03-05
申请号：CA395967
申请日：1982-02-10
Applicant: SONY CORP
Inventor： IGA AKIRA , ODAKA KENTARO , YASUDA NOBUYUKI
IPC: H04B7/15 , H04B7/185 , H04H20/88 , H04H40/45 , H04J3/00 , H04J3/04 , H04J3/14 , H04L1/00 , H04J3/06
Abstract: A method for transmitting time-sharing multidata in which data series of a plurality of channels are time-sharing multiplexed to form a transmitting data series having the steps of adding an error detecting or error correcting redundant bits and synchronizing redundant bits to predetermined number of information bits contained in the respective data series of the channels to form one transmitting unit, forming bit groups in a manner as to take each bit corresponding to each other between the channels as one group with respect to the information bits, the error detecting or error correcting redundant bits and the synchronizing redundant bits of said one transmitting unit of each of the channels, time-sharing multiplexing the data series so as to form one frame in which these bit groups are sequentially continued to each other and using the synchronizing redundant bits as a frame synchronizing signal of the transmitting data series.
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Patent Agency Ranking
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公开(公告)号：DE68923383T2
公开(公告)日：1995-11-30
申请号：DE68923383
申请日：1989-01-09
Applicant: SONY CORP
Inventor： IGA AKIRA , OSHIBA KATSUYUKI
Abstract: An identification system for personal, freight items and such like comprises a tag-like electronic responder device (1) which comprises an antenna (4a, 4b) which reflects, and thereby modifies, an electrical wave incident thereon from a separate interrogator device. The device (1) modifies the reflection in accordance with binary data generated by data generating means (9) by varying the impedance loading of the antenna (4a, 4b) by switching a FET (8) in accordance with the binary data. The binary data may comprise identification data as well as synchronising data for decoding purposes. The responder device (1) may be reprogrammed with new identification data by means of a programmer.
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公开(公告)号：DE68923383D1
公开(公告)日：1995-08-17
申请号：DE68923383
申请日：1989-01-09
Applicant: SONY CORP
Inventor： IGA AKIRA , OSHIBA KATSUYUKI
Abstract: An identification system for personal, freight items and such like comprises a tag-like electronic responder device (1) which comprises an antenna (4a, 4b) which reflects, and thereby modifies, an electrical wave incident thereon from a separate interrogator device. The device (1) modifies the reflection in accordance with binary data generated by data generating means (9) by varying the impedance loading of the antenna (4a, 4b) by switching a FET (8) in accordance with the binary data. The binary data may comprise identification data as well as synchronising data for decoding purposes. The responder device (1) may be reprogrammed with new identification data by means of a programmer.
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