Method and device for transmitting information over a communication channel with variable impedance

    公开(公告)号:US09979418B2

    公开(公告)日:2018-05-22

    申请号:US15617831

    申请日:2017-06-08

    Inventor: Mark Wallis

    CPC classification number: H04B1/0007 H04B3/54 H04B2203/5425 H04L5/001

    Abstract: A method includes digital/analog conversion of a digital signal modulated by information to provide a modulated initial analog signal having a crest factor greater than one, and amplification of the initial analog signal to provide an amplified modulated signal. A modulated channel analog signal derived from the modulated amplified analog signal is transmitted over a communications channel, with impedance of the communications channel varying during the transmission. The method further includes at least one determination during the transmission of a peak-clipping rate of the amplified analog signal over at least one time interval, and an adjustment of a level of the initial analog signal as a function of the determined peak-clipping rate.

    Mechanism for verifying the authenticity of a product

    公开(公告)号:US09934508B2

    公开(公告)日:2018-04-03

    申请号:US14305070

    申请日:2014-06-16

    CPC classification number: G06Q30/018 G06F3/12 G06F21/44 G06F21/608 G06F21/73

    Abstract: The authenticity of a product associated with a host device is verified through a process. The product contains, in segments of a non-volatile memory, several different functions stored in ciphered fashion. The process involves, in a first phase, the sending by the host device of a control signal for executing a function, with the product functioning to decipher the function and store the unciphered function in the non-volatile memory. The process further involves, in a second phase, the sending by the host device of a control signal for causing execution of the deciphered function, with the product functioning to execute the function and send a result of this execution back to the host device. The host device evaluates the received result to verify product authenticity.

    METHOD FOR DETECTING THE EVENTUAL PRESENCE OF AN OBJECT BY A CONTACTLESS READER, AND CORRESPONDING READER

    公开(公告)号:US20180091192A1

    公开(公告)日:2018-03-29

    申请号:US15444576

    申请日:2017-02-28

    CPC classification number: H04B5/0031 G01S13/04 G06K7/10128

    Abstract: A method can be used for detecting a potential presence of an object by a reader capable of mutually communicating via a contactless communications protocol. An antenna of the reader transmits a magnetic field on a carrier signal having a sub-carrier modulated by a first data sequence. The modulated sub-carrier is non-interpretable by the object. The antenna of the reader receives a signal resulting from the transmission. The reader demodulates the sub-carrier of the resulting signal so as to extract a second data sequence from the resulting signal. The first data sequence and second data sequence are correlated and the potential presence or absence of the object is determined based upon the result of the correlating.

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