26.
    发明专利
    未知

    公开(公告)号:FI871897A

    公开(公告)日:1987-04-29

    申请号:FI871897

    申请日:1987-04-29

    Applicant: MOTOROLA INC

    Abstract: The digital receiver 100 forms a digital radio frequency receiver which processes a received analogue signal which is converted to digital form in accordance with prior selection at the output from the aerial. The digital receiver 100 according to this invention comprises a preselector 106, a high-speed analogue/digital converter 108, a digital selective intermediate frequency section 110 which has an output signal essentially at baseband frequencies, and a digital signal processing circuit 120 which carries out demodulation and audio filtering. The radio architecture of this invention can be programmed for application for practically all known modulation schemes and is particularly suitable for equipment with integrated circuits.

    27.
    发明专利
    未知

    公开(公告)号:DK184287A

    公开(公告)日:1987-04-10

    申请号:DK184287

    申请日:1987-04-10

    Applicant: MOTOROLA INC

    Abstract: The digital receiver (100) contemplates a digital radio receiver which operates on a received analog signal which has been converted to a digital form after preselection at the output of the antenna. The digital receiver (100) of the present invention comprises a preselector (106), a high-speed analog-to-digital (A/D) converter (108), a digitally implemented itermediate-frequency (IF) selectively section (110) having an output signal at substantially baseband frequencies, and digital signalprocessor (DSP) circuit (120) performing demodulation and audio filtering. The radio architecture of the present invention is programmably adaptable to virtually every known modulation scheme and is particularly suitable for implementation on integrated circuits.

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