Patents by Inventor Graham Martin Avis
Graham Martin Avis has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20040190645Abstract: A wireless digital subscriber communications system includes a base station and a subscriber unit and uses communications signals provided over a plurality of radio frequency channels. A processor provides an output phase signal corresponding to a selected output digital frequency, and a lookup table is used having two sets of predefined stored values pertaining to the amplitude of a signal for a single quadrant. In particular embodiments, predefined stored values include coarse angle approximations and fine angle approximations and a sine and cosine generator receives the phase signal and generates sine and cosine waveforms utilizing amplitude values obtained from the lookup table.Type: ApplicationFiled: April 5, 2004Publication date: September 30, 2004Applicant: InterDigital Technology CorporationInventors: David Norton Critchlow, Moshe Yehushua, Graham Martin Avis, Wade Lyle Heimbigner, Karle J. Johnson, George Alan Wiley
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Patent number: 6724851Abstract: A FIR chip is used in a wireless subscriber unit. The subscriber unit includes a processor for transcoding an input signal to provide digital input symbols. A received output signal is demodulated. Digital output symbols are synthesized from the demodulated output signal processor and filtered digital input symbols are provided. An internal address decoder decodes to allow the processor to access internal functions of the FIR chip. A control and status register allows the processor to read the status of and control the internal functions of the FIR chip. A FIR filter filters the digital input symbols. A transmit timer controls timing which allows the processor to control the FIR filter. A receive timer generates timing signals for timing transcoding operations and synthesizing operations connected to the processor.Type: GrantFiled: April 11, 2003Date of Patent: April 20, 2004Inventors: David Norton Critchlow, Moshe Yehushua, Graham Martin Avis, Wade Lyle Heimbigner, Karle Joseph Johnson, George Alan Wiley
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Publication number: 20030189988Abstract: A subscriber unit has a processor. The processor provides an output phase signal corresponding to a selected output digital frequency. A tuning register buffers the phase signal. A lookup table has two sets of predefined stored values pertaining to the amplitude of a signal for a single quadrant. The predefined stored values comprise coarse angle approximations and fine angle approximations. A sine and cosine generator receives the phase signal and generates sine and cosine waveforms utilizing amplitude values obtained from the lookup table. The phase signal includes phase data and specifies the quadrant and the algebraic sign of the phase data. The sine and cosine generator accessing the lookup table differently depending upon the quadrant and sine of the phase data, such that the lookup table provides an amplitude value from the sets of predefined stored values based on the phase data.Type: ApplicationFiled: April 11, 2003Publication date: October 9, 2003Inventors: David Norton Critchlow, Moshe Yehushua, Graham Martin Avis, Wade Lyle Heimbigner, Karle Joseph Johnson, George Alan Wiley
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Patent number: 6587516Abstract: A subscriber unit has a processor. The processor provides an output phase signal corresponding to a selected output digital frequency. A tuning register buffers the phase signal. A lookup table has two sets of predefined stored values pertaining to the amplitude of a signal for a single quadrant. The predefined stored values comprise coarse angle approximations and fine angle approximations. A sine and cosine generator receives the phase signal and generates sine and cosine waveforms utilizing amplitude values obtained from the lookup table. The phase signal includes phase data and specifies the quadrant and the algebraic sign of the phase data. The sine and cosine generator accessing the lookup table differently depending upon the quadrant and sine of the phase data, such that the lookup table provides an amplitude value from the sets of predefined stored values based on the phase data.Type: GrantFiled: August 20, 2002Date of Patent: July 1, 2003Assignee: InterDigital Technology CorporationInventors: David Norton Critchlow, Moshe Yehushua, Graham Martin Avis, Wade Lyle Heimbigner, Karle Joseph Johnson, George Alan Wiley
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Publication number: 20030053553Abstract: A subscriber unit has a processor. The processor provides an output phase signal corresponding to a selected output digital frequency. A tuning register buffers the phase signal. A lookup table has two sets of predefined stored values pertaining to the amplitude of a signal for a single quadrant. The predefined stored values comprise coarse angle approximations and fine angle approximations. A sine and cosine generator receives the phase signal and generates sine and cosine waveforms utilizing amplitude values obtained from the lookup table. The phase signal includes phase data and specifies the quadrant and the algebraic sign of the phase data. The sine and cosine generator accessing the lookup table differently depending upon the quadrant and sine of the phase data, such that the lookup table provides an amplitude value from the sets of predefined stored values based on the phase data.Type: ApplicationFiled: August 20, 2002Publication date: March 20, 2003Applicant: InterDigital Technology CorporationInventors: David Norton Critchlow, Moshe Yehushua, Graham Martin Avis, Wade Lyle Heimbigner, Karle Joseph Johnson, George Alan Wiley
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Patent number: 6449317Abstract: The present invention is a method and system for processing communication signals in a wireless telecommunication system having at least two subscriber units. The subscriber units communicate with each other through a selected band of radio frequencies over a plurality of radio frequency channels. The system generates a fixed based radio frequency signal and a digital intermediate frequency signal. The fixed based radio frequency signal and the digital intermediate frequency signal are then combined to produce a carrier signal which is communicated between the at least two subscribers.Type: GrantFiled: June 13, 2000Date of Patent: September 10, 2002Assignee: Interdigital Technology CorporationInventors: David Norton Critchlow, Moshe Yehushua, Graham Martin Avis, Wade Lyle Heimbigner, Karle Joseph Johnson, George Alan Wiley
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Patent number: 6078629Abstract: 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 prccessor 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.Type: GrantFiled: January 11, 1999Date of Patent: June 20, 2000Assignee: InterDigital Technology CorporationInventors: David Norton Critchlow, Moshe Yehushua, Graham Martin Avis, Wade Lyle Heimbigner, Karle Joseph Johnson, George Alan Wiley
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Patent number: 5859883Abstract: 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.Type: GrantFiled: June 24, 1997Date of Patent: January 12, 1999Assignee: InterDigital Technology CorporationInventors: David Norton Critchlow, Moshe Yehushua, Graham Martin Avis, Wade Lyle Heimbigner, Karle Joseph Johnson, George Alan Wiley
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Patent number: 5694430Abstract: 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.Type: GrantFiled: January 11, 1996Date of Patent: December 2, 1997Assignee: InterDigital Technology CorporationInventors: David Norton Critchlow, Moshe Yehushua, Graham Martin Avis, Wade Lyle Heimbigner, Karle Joseph Johnson, George Alan Wiley