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公开(公告)号：DE2523529A1
公开(公告)日：1975-12-11
申请号：DE2523529
申请日：1975-05-27
Applicant: SONY CORP
Inventor： NAKAMURA HIDEO , IGA AKIRA
Abstract: A pulse control circuit comprising a first FET (Field Effect Transistor), put into the conductive state in response to an input pulse signal, a first time constant circuit charged when the first FET is put in the conductive state, a second FET put into the conductive state with the charging voltage of the first time constant circuit, and a second time constant circuit discharging the charged electricity in the first time constant circuit when the second FET is put in the conductive state.
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公开(公告)号：AU3457200A
公开(公告)日：2000-10-16
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：CA2333884A1
公开(公告)日：2000-10-05
申请号：CA2333884
申请日：2000-03-31
Applicant: SONY CORP
Inventor： EZAKI TADASHI , SATO HIDEO , IGA AKIRA
Abstract: For copyright protection, storage means stores a reference indicating an amount of information to determine whether a digital signal containing electronic watermark information is compressed. Extraction means extracts th e amount of the electronic watermark information from the digital signal to be protected. Detector means collates the extracted amount with the reference amount to determine whether the signal has been compressed, and it permits t he signal to be copied if uncompressed and prohibits it from being copied if compressed.
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Patent Agency Ranking
公开(公告)号：CA1335676C
公开(公告)日：1995-05-23
申请号：CA587475
申请日：1989-01-04
Applicant: SONY CORP
Inventor： IGA AKIRA , OSHIBA KATSUYUKI
Abstract: A portable device having an antenna for reflecting an electric wave emitted from a recognition device, a data generator for generating data to be sent from the portable device to the recognition device, and an impedance changer for changing an impedance of the antenna according to the data generated by the data generator, whereby the electric wave reflected by the antenna is modulated with the data generated by the data generator.
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公开(公告)号：AU625452B2
公开(公告)日：1992-07-09
申请号：AU2775089
申请日：1989-01-05
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：CA1108766A
公开(公告)日：1981-09-08
申请号：CA325935
申请日：1979-04-20
Applicant: SONY CORP
Inventor： DOI TOSHITADA , IGA AKIRA
Abstract: In a digital signal transmission system, a predetermined number of words of digital information signals are added bit by bit in a modulo 2 adder to produce a first parity signal. The information signals and the first parity signal are delayed so as to have different delay times to each other, and the signals thus delayed are again added bit by bit in a modulo 2 adder to produce a second parity signal. The predetermined number of words of information signals and the first and second parity signals are Aerially transmitted through a transmission line.
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