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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.
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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
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.
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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
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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
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Patent Agency Ranking15.发明专利
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
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.
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公开(公告)号：NL194632C
公开(公告)日：2002-09-03
申请号：NL9700007
申请日：1997-08-26
Applicant: INTERDIGITAL TECH CORP
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公开(公告)号：NL194631C
公开(公告)日：2002-09-03
申请号：NL9700008
申请日：1997-08-26
Applicant: INTERDIGITAL TECH CORP
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公开(公告)号：NL194631B
公开(公告)日：2002-05-01
申请号：NL9700008
申请日：1997-08-26
Applicant: INTERDIGITAL TECH CORP
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公开(公告)号：CA2137010A1
公开(公告)日：1991-02-15
申请号：CA2137010
申请日：1990-07-27
Applicant: INTERDIGITAL TECH CORP
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