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    2.
    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.

    4.
    发明专利
    未知

    公开(公告)号：FI111308B

    公开(公告)日：2003-06-30

    申请号：FI903986

    申请日：1990-08-13

    Applicant: INTERDIGITAL TECH CORP

    Inventor： CRITCHLOW DAVID NORTON ,  YEHUSHUA MOSHE ,  AVIS GRAHAM MARTIN ,  HEIMBIGNER WADE LYLE ,  JOHNSON KARLE JOSEPH ,  WILEY GEORGE ALAN

    IPC: H04M1/00 ,  H03B28/00 ,  H03C3/00 ,  H03D3/00 ,  H04B1/40 ,  H04B3/00 ,  H04B7/00 ,  H04J3/02 ,  H04L25/03 ,  H04L27/00 ,  H04L27/18 ,  H04L27/20 ,  H04W84/16 ,  H04L25/40

    Abstract: A subscriber unit for wireless communication with a base station in a wireless subscriber communication system includes a FIR chip, a DIF (digital intermediate frequency) chip, a single processor chip and a radio. The processor chip transcodes a digital voice input signal to provide digital input symbols; demodulates an output signal received from the base station to provide digital output symbols; and synthesizes a digital voice output signal from the digital output symbols. The FIR chip FIR filters the digital input symbols and generates timing signals for timing the transcoding and synthesizing operations in the processor chip. The DIF chip digitally synthesizes a digital intermediate frequency signal by direct digital synthesis (DDS) and modulates the digital intermediate frequency signal with the filtered input symbols to provide a modulated intermediate frequency input signal. The radio further processes the modulated input signal for transmission to the base station.

    5.
    发明专利
    未知

    公开(公告)号：SE516955C2

    公开(公告)日：2002-03-26

    申请号：SE9202259

    申请日：1992-07-30

    Applicant: INTERDIGITAL TECH CORP

    Inventor： CRITCHLOW DAVID NORTON ,  YEHUSHUA MOSHE ,  AVIS GRAHAM MARTIN ,  HEIMBIGNER WADE LYLE ,  JOHNSON KARLE JOSEPH ,  WILEY GEORGE ALAN

    IPC: H03B28/00 ,  H04M1/00 ,  H03C3/00 ,  H03D3/00 ,  H04B1/40 ,  H04B3/00 ,  H04B7/00 ,  H04J3/02 ,  H04L25/03 ,  H04L27/00 ,  H04L27/18 ,  H04L27/20 ,  H04W84/16 ,  H04B7/26

    Abstract: A subscriber unit for wireless communication with a base station in a wireless subscriber communication system includes a FIR chip, a DIF (digital intermediate frequency) chip, a single processor chip and a radio. The processor chip transcodes a digital voice input signal to provide digital input symbols; demodulates an output signal received from the base station to provide digital output symbols; and synthesizes a digital voice output signal from the digital output symbols. The FIR chip FIR filters the digital input symbols and generates timing signals for timing the transcoding and synthesizing operations in the processor chip. The DIF chip digitally synthesizes a digital intermediate frequency signal by direct digital synthesis (DDS) and modulates the digital intermediate frequency signal with the filtered input symbols to provide a modulated intermediate frequency input signal. The radio further processes the modulated input signal for transmission to the base station.

    Subscriber unit for a wireless digital communications system
    6.
    发明专利
    Subscriber unit for a wireless digital communications system 未知

    公开(公告)号：NL9700007A

    公开(公告)日：1997-12-01

    申请号：NL9700007

    申请日：1997-08-26

    Applicant: INTERDIGITAL TECH CORP

    Inventor： CRITCHLOW DAVID NORTON ,  YEHUSHUA MOSHE ,  AVIS GRAHAM MARTIN ,  HEIMBIGNER WADE LYLE ,  JOHNSON KARLE JOSEPH ,  WILEY GEORGE ALAN

    IPC: H03B28/00 ,  H03C3/00 ,  H03D3/00 ,  H04L25/03 ,  H04L27/00 ,  H04L27/20 ,  H04Q7/32

    Abstract: Subscriber unit for a wireless digital telephone communications system in which the subscriber unit comprises coding/decoding means and an associated processing unit for the re-coding of an input signal in order to produce digital input symbols, FIR (final impulse response) means which respond to the processing unit to provide FIR-filtered digital input symbols, a radio to transmit a signal, which comprises the information present in the FIR-filtered digital input symbols, to a second unit within the system and for demodulating an output signal received from the second unit, the processing unit composing digital output signals from the demodulated output signal, the FIR means being implemented as an FIR chip, which comprises: means for internal address decoding to enable the processing unit to gain access to internal functions of the FIR chip; control and status registers which enable the processing unit to read the status of the FIR chip and to control internal functions thereof; means for the filtering, with final impulse response, of the digital input symbols and means for controlling the timing which enables the processing unit to control the FIR filter means.

    MODEM FOR TELEPHONE SYSTEMS
    8.
    发明专利
    MODEM FOR TELEPHONE SYSTEMS 未知

    公开(公告)号：AU4767685A

    公开(公告)日：1986-09-25

    申请号：AU4767685

    申请日：1985-09-23

    Applicant: INTERDIGITAL TECH CORP

    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.

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