公开(公告)号：GB2235854B

公开(公告)日：1994-06-29

申请号：GB9016880

申请日：1990-08-01

Applicant: INT MOBILE MACHINES ,  INTERDIGITAL COMMUNICATIONS CO ,  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

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.

公开(公告)号：NO307239B1

公开(公告)日：2000-02-28

申请号：NO903529

申请日：1990-08-10

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 ,  H04M1/00 ,  H03D3/00 ,  H04B1/40 ,  H04B3/00 ,  H04B7/00 ,  H04J3/02 ,  H04L25/03 ,  H04L27/00 ,  H04L27/18 ,  H04L27/20 ,  H04W84/16 ,  H04Q7/32

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.

公开(公告)号：DE3609394C2

公开(公告)日：1998-11-05

申请号：DE3609394

申请日：1986-03-20

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 ,  H03H15/00 ,  H03H17/00

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.

公开(公告)号：NL9700008A

公开(公告)日：1997-12-01

申请号：NL9700008

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 ,  H04B7/26 ,  H04Q7/32

Abstract: The system includes a device to modulate digital intermediate frequency signals with the filtered input symbols, a device to process the modulated input signals for transmission at the base station, a FIR (Finite Impulse Response) chip for FIR filtering of digital input symbols, a DIF (Digital Intermediate Frequency) chip for digital synthesising and modulation of digital intermediate frequency signals, and a processor chip for encoding the digital input tone signals and decoding of the base station output signals.

公开(公告)号：IN178987B

公开(公告)日：1997-08-02

申请号：IN779DE1990

申请日：1990-08-01

Applicant: INTERDIGITAL TECH CORP

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

IPC: H04L13/00

公开(公告)号：GB2270447B

公开(公告)日：1994-05-25

申请号：GB9322680

申请日：1993-11-03

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 ,  H04L25/03 ,  H04L27/00 ,  H04L27/20

公开(公告)号：GB2270447A

公开(公告)日：1994-03-09

申请号：GB9322680

申请日：1993-11-03

Applicant: INTERDIGITAL TECH CORP

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

IPC: H03B28/00 ,  H03C3/00 ,  H04L25/03 ,  H04L27/00 ,  H04L27/20

Abstract: 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. Tuning registers 65 store phase increment data from the processor, the DDS phase accumulator 66 accumulates the data from registers 65 and provides digitized phase values which are used to generate (67) a digital IF signal, mixed in modulator 68 and filtered in noise shaper 69.