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    17.
    发明专利
    未知

    公开(公告)号：DE3640555C2

    公开(公告)日：1997-05-15

    申请号：DE3640555

    申请日：1986-11-27

    Applicant: INTERDIGITAL TECH CORP

    Inventor： PANETH ERIC

    IPC: H03L7/22 ,  H03L7/093 ,  H03L7/23 ,  H04B1/04 ,  H04J1/00 ,  C03L7/06 ,  H04B1/40

    Abstract: In a broadcast telephone system for communicating information signals over an assigned frequency channel, the combination of a synthesizer for generating a signal at the assigned frequency and a PROM storing a plurality of sets of first and second signals associated with different predetermined assignable frequencies. The synthesizer includes a first phase-locked loop for generating an output signal at a frequency within a first predetermined range including the plurality of assignable frequencies in response to the combination of a first frequency reference signal having a predetermined frequency and a second reference frequency signal having a frequency within a second predetermined range and derived from a second phase-locked loop a second phase-locked loop for generating a third reference frequency signal within a third predetermined range in response to a combination of a first signal from the PROM associated with a given assignable frequency and a fourth frequency reference signal having a predetermined frequency; and a frequency divider coupled to the PROM for dividing the frequency of the output signal from the second phase-locked loop by an amount indicated by a second signal from the PROM associated with said given assignable frequency to provide the second reference signal to the first phase-locked loop. The phase-locked loops each include a minimizing phase noise and electronic noise due to microphonics.

    18.
    发明专利
    未知

    公开(公告)号：NO179929B

    公开(公告)日：1996-09-30

    申请号：NO854602

    申请日：1985-11-18

    Applicant: INTERDIGITAL TECH CORP ,  INTERDIGITAL COMMUNICATIONS CO ,  INT MOBILE MACHINES

    Inventor： PANETH ERIC ,  CRITCHLOW DAVID N ,  YEHUSHUA MOSHE

    IPC: H03D7/00 ,  A63B31/00 ,  H04L27/18 ,  H04L27/20 ,  H04L27/22 ,  H04L27/227

    Abstract: A modulator for a modem, said modulator being adapted to convert a bit stream, wherein each given number of successive bits defines a symbol, into a phase modulated intermediate frequency (IF) signal, the symbols in the modulator section being phase modulated DPSK conversion. The phase modulated symbols are then digitally filtered to provide a filtered signal comprising time shared, digital in-phase and quadrature phase components that, when converted into an analog signal, provides a modulation signal of a frequency that is centered about a predetermined frequency and deviates therefrom in accordance with the value of the phase modulated symbol. The filtered signal, after being converted to an analog signal is then filtered and passed to a mixer for up conversion to an IF signal.

    MULTIPLE PHASE DEMODULATOR FOR MODEM TELEPHONE SYSTEMS
    19.
    发明专利
    MULTIPLE PHASE DEMODULATOR FOR MODEM TELEPHONE SYSTEMS 未知

    公开(公告)号：AU2162488A

    公开(公告)日：1988-12-01

    申请号：AU2162488

    申请日：1988-08-29

    Applicant: INTERDIGITAL TECH CORP

    Inventor： PANETH ERIC ,  YESHUHUA MOSHE ,  CRITCHLOW DAVID N

    IPC: H03D7/00 ,  A63B31/00 ,  H04L27/18 ,  H04L27/20 ,  H04L27/22 ,  H04L27/227 ,  B63C9/16

    Abstract: A modulator for a modem, said modulator being adapted to convert a bit stream, wherein each given number of successive bits defines a symbol, into a phase modulated intermediate frequency (IF) signal, the symbols in the modulator section being phase modulated DPSK conversion. The phase modulated symbols are then digitally filtered to provide a filtered signal comprising time shared, digital in-phase and quadrature phase components that, when converted into an analog signal, provides a modulation signal of a frequency that is centered about a predetermined frequency and deviates therefrom in accordance with the value of the phase modulated symbol. The filtered signal, after being converted to an analog signal is then filtered and passed to a mixer for up conversion to an IF signal.

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