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    DIGITAL AM DEMODULATOR
    1.
    发明专利
    DIGITAL AM DEMODULATOR 失效

    公开(公告)号：JP2001028608A

    公开(公告)日：2001-01-30

    申请号：JP2000160376

    申请日：2000-05-30

    Applicant: ST MICROELECTRONICS SRL

    Inventor： DELLA TORRE LUIGI ,  RONCHI MARCO ,  VITALI ANDREA

    IPC: H03D1/00 ,  H04L7/00 ,  H04L27/06 ,  H04N5/455

    Abstract: PROBLEM TO BE SOLVED: To restore the frequency and phase of a carrier by generating a first carrier which is not correlated to an input signal, to be modulated, to multiply the first carrier by the input signal, which should be modulated, and removing radiation of undesirable spectrum by plural filters arranged at the up/down stream of a multiplier. SOLUTION: A signal reaching from a tuner 11 is sampled by an analog/ digital converter 12 and supplied to a block 10, next. The block 10 includes an input filter 1, a low-pass filter 2 and a multiplier 3 for removing radiation of undesirable spectrum. In the block 10, the multiplier 3 multiplies a signal outputted from the filter 1 by a carrier given by a carrier generator 13. A digital demodulator includes a means for detecting phase shift between the frequency of an input signal (x), which is given from the converter 12 and supplied to the filter 1, and a local carrier in addition.

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