Patents by Inventor Aki Shohara
Aki Shohara 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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Patent number: 8244233Abstract: A method for operating a virtual whiteboard using a mobile phone device, comprises the steps of: generating the virtual whiteboard, wherein the mobile phone device is coupled to the virtual whiteboard to input data to the virtual whiteboard; connecting the mobile phone device to an external display device; displaying the virtual whiteboard on the external display device; and operating the virtual whiteboard using the mobile phone device; wherein markings on the virtual whiteboard correspond to spatial movements of the mobile phone device.Type: GrantFiled: April 13, 2010Date of Patent: August 14, 2012Assignee: Augusta Technology, Inc.Inventors: Tung Chang, Aki Shohara
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Publication number: 20100261466Abstract: A method for operating a virtual whiteboard using a mobile phone device, comprises the steps of: generating the virtual whiteboard, wherein the mobile phone device is coupled to the virtual whiteboard to input data to the virtual whiteboard; connecting the mobile phone device to an external display device; displaying the virtual whiteboard on the external display device; and operating the virtual whiteboard using the mobile phone device; wherein markings on the virtual whiteboard correspond to spatial movements of the mobile phone device.Type: ApplicationFiled: April 13, 2010Publication date: October 14, 2010Applicant: AUGUSTA TECHNOLOGY, INC.Inventors: Tung Chang, Aki Shohara
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Patent number: 7551911Abstract: Provided is a system for operating a communication device (20) for reception of scheduled intermittent information messages (22) with a dual mode timer (70) that extends battery life. A controller (50) schedules the timer (70) to power down all idle components of the device (20) between message receptions in a power saving sleep mode to conserve battery power. During active mode when the device is fully active in reception of messages, the timer (70) uses a reference oscillator (90) with a relatively high frequency to support digital processing by the receiver (26). During sleep mode when only the timer is powered on, a much lower frequency sleep oscillator (96) is used to maintain the lowest possible level of power consumption within the timer itself. The timer (70) has provision for automatic temperature calibration to compensate for timing inaccuracies inherent to the low-power low-frequency crystal oscillator (96) used for the sleep mode.Type: GrantFiled: May 14, 2007Date of Patent: June 23, 2009Assignee: Broadcom CorporationInventors: Aki Shohara, Emilia Vailun Lei
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Patent number: 7366254Abstract: A system for implementing Incremental Redundancy (IR) operations in a wireless receiver includes a baseband processor, an equalizer, a system processor, and an IR processing module. The baseband processor receives an analog signal corresponding to a data block and samples the analog signal to produce samples. The equalizer receives the samples from the baseband processor, equalizes the samples, and produces soft decision bits corresponding to the data block. The equalizer may be implemented as a distinct processing component or may be performed by the baseband processor or system processor. The system processor receives at least the soft decision bits and initiates IR operations. The IR processing module receives the soft decision bits of the data block and performs IR operations on the data block in an attempt to correctly decode a corresponding data block.Type: GrantFiled: December 8, 2006Date of Patent: April 29, 2008Assignee: Broadcom CorporationInventors: Li Fung Chang, Nelson R. Sollenberger, Yongqian Wang, Aki Shohara, Yue Chen
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Patent number: 7277506Abstract: An improved method and apparatus for Viterbi Algorithm calculations for maximum likelihood sequence estimators in communication receivers is disclosed. The calculations for the maximum likelihood sequence estimator, in accordance with the invention, utilizes a variant of the Viterbi algorithm developed by Ungerboeck in which the associated branch metric calculations for the trellis require the computation of a set of branch metric parameters. An embodiment of the present invention provides for an improved recursive method and apparatus for calculation of the branch metric parameters that reduces the number of processor clock cycles required per state metric calculation. This enables real time computation of the branch metric parameters during execution of the Viterbi Algorithm.Type: GrantFiled: August 9, 2000Date of Patent: October 2, 2007Assignee: Broadcom CorporationInventors: Stephen P. Pope, Aki Shohara, Yuo Chen, Bryan Chase
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Publication number: 20070213028Abstract: Provided is a system for operating a communication device (20) for reception of scheduled intermittent information messages (22) with a dual mode timer (70) that extends battery life. A controller (50) schedules the timer (70) to power down all idle components of the device (20) between message receptions in a power saving sleep mode to conserve battery power. During active mode when the device is fully active in reception of messages, the timer (70) uses a reference oscillator (90) with a relatively high frequency to support digital processing by the receiver (26). During sleep mode when only the timer is powered on, a much lower frequency sleep oscillator (96) is used to maintain the lowest possible level of power consumption within the timer itself. The timer (70) has provision for automatic temperature calibration to compensate for timing inaccuracies inherent to the low-power low-frequency crystal oscillator (96) used for the sleep mode.Type: ApplicationFiled: May 14, 2007Publication date: September 13, 2007Applicant: BROADCOM CORPORATIONInventors: Aki Shohara, Emilia Lei
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Patent number: 7218911Abstract: The present invention provides for a system for operating a communication device (20) for reception of scheduled intermittent information messages (22) with a dual mode timer (70) that extends battery life. A controller (50) schedules the timer (70) to power down all idle components of the device (20) between message receptions in a power saving sleep mode to conserve battery power. During active mode when the device is fully active in reception of messages, the timer (70) uses a reference oscillator (90) with a relatively high frequency to support digital processing by the receiver (26). During sleep mode when only the timer is powered on, a much lower frequency sleep oscillator (96) is used to maintain the lowest possible level of power consumption within the timer itself. The timer (70) has provision for automatic temperature calibration to compensate for timing inaccuracies inherent to the low-power low-frequency crystal oscillator (96) used for the sleep mode.Type: GrantFiled: September 14, 2004Date of Patent: May 15, 2007Assignee: Broadcom CorporationInventors: Aki Shohara, Emilia Vailun Lei
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Publication number: 20070081612Abstract: A system for implementing Incremental Redundancy (IR) operations in a wireless receiver includes a baseband processor, an equalizer, a system processor, and an IR processing module. The baseband processor receives an analog signal corresponding to a data block and samples the analog signal to produce samples. The equalizer receives the samples from the baseband processor, equalizes the samples, and produces soft decision bits corresponding to the data block. The equalizer may be implemented as a distinct processing component or may be performed by the baseband processor or system processor. The system processor receives at least the soft decision bits and initiates IR operations. The IR processing module receives the soft decision bits of the data block and performs IR operations on the data block in an attempt to correctly decode a corresponding data block.Type: ApplicationFiled: December 8, 2006Publication date: April 12, 2007Applicant: Broadcom Corporation, a California CorporationInventors: Li Chang, Nelson Sollenberger, Yongqian Wang, Aki Shohara, Yue Chen
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Patent number: 7164732Abstract: A system for implementing Incremental Redundancy (IR) operations in a wireless receiver includes a baseband processor, an equalizer, a system processor, and an IR processing module. The baseband processor receives an analog signal corresponding to a data block and samples the analog signal to produce samples. The equalizer receives the samples from the baseband processor, equalizes the samples, and produces soft decision bits corresponding to the data block. The equalizer may be implemented as a distinct processing component or may be performed by the baseband processor or system processor. The system processor receives at least the soft decision bits and initiates IR operations. The IR processing module receives the soft decision bits of the data block and performs IR operations on the data block in an attempt to correctly decode a corresponding data block.Type: GrantFiled: December 9, 2003Date of Patent: January 16, 2007Assignee: Broadcom CorporationInventors: Li Fung Chang, Nelson Sollenberger, Yongqian Wang, Aki Shohara, Yue Chen
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Patent number: 7095808Abstract: A method of compressing a puncture mask information is disclosed, the method comprising making a delayed puncture mask by deleting the last k bits of the puncture mask; and appending k zeros to the beginning of the puncture mask; making a differential puncture mask by XORing the delayed puncture mask with the puncture mask; and compressing the differential puncture mask.Type: GrantFiled: August 16, 2000Date of Patent: August 22, 2006Assignee: Broadcom CorporationInventor: Aki Shohara
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Patent number: 6985705Abstract: The present invention provides for a system and method for improvement of radio transmitter and receiver frequency accuracy for a local radio communication unit that communicates digital data with a remote communication unit. In the local unit the received radio signal is down-converted, and converted to complex baseband digital samples by an analog-to-digital converter. A downlink digital phase rotator applies a fine frequency shift to the samples in accordance with a receiver frequency offset command. The resultant baseband signal is used by the data demodulator and by a receiver frequency error estimator to obtain receiver frequency errors. A data modulator generates baseband complex samples which are shifted in carrier frequency by an integrated uplink digital phase rotator in accordance with a transmitter frequency offset command. The modulated samples are then converted by a digital-to-analog converter and upconverted in frequency for radio transmission to the remote unit.Type: GrantFiled: October 19, 2004Date of Patent: January 10, 2006Assignee: Broadcom CorporationInventor: Aki Shohara
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Publication number: 20050078743Abstract: The present invention provides for a system and method for improvement of radio transmitter and receiver frequency accuracy for a local radio communication unit that communicates digital data with a remote communication unit. In the local unit the received radio signal is down-converted, and converted to complex baseband digital samples by an analog-to-digital converter. A downlink digital phase rotator applies a fine frequency shift to the samples in accordance with a receiver frequency offset command. The resultant baseband signal is used by the data demodulator and by a receiver frequency error estimator to obtain receiver frequency errors. A data modulator generates baseband complex samples which are shifted in carrier frequency by an integrated uplink digital phase rotator in accordance with a transmitter frequency offset command. The modulated samples are then converted by a digital-to-analog converter and upconverted in frequency for radio transmission to the remote unit.Type: ApplicationFiled: October 19, 2004Publication date: April 14, 2005Inventor: Aki Shohara
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Publication number: 20050043068Abstract: The present invention provides for a system for operating a communication device (20) for reception of scheduled intermittent information messages (22) with a dual mode timer (70) that extends battery life. A controller (50) schedules the timer (70) to power down all idle components of the device (20) between message receptions in a power saving sleep mode to conserve battery power. During active mode when the device is fully active in reception of messages, the timer (70) uses a reference oscillator (90) with a relatively high frequency to support digital processing by the receiver (26). During sleep mode when only the timer is powered on, a much lower frequency sleep oscillator (96) is used to maintain the lowest possible level of power consumption within the timer itself. The timer (70) has provision for automatic temperature calibration to compensate for timing inaccuracies inherent to the low-power low-frequency crystal oscillator (96) used for the sleep mode.Type: ApplicationFiled: September 14, 2004Publication date: February 24, 2005Inventors: Aki Shohara, Emilia Lei
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Patent number: 6816716Abstract: A system and operation of the system for improvement of transmitter and receiver frequency accuracy for a local radio communication unit that communicates digital data with a remote communication unit. In the local unit, received signals are down-converted into complex baseband digital samples by A/D conversion. A downlink digital phase rotator applies a fine frequency shift in accordance with a receiver frequency offset command. The resultant baseband signal is used by the data demodulator and by a receiver frequency error estimator to obtain receiver frequency errors. A data modulator generates baseband complex samples which are shifted in carrier frequency by an integrated uplink digital phase rotator in accordance with a transmitter frequency offset command. The modulated samples are then converted by a D/A converter and upconverted in frequency for transmission to the remote unit.Type: GrantFiled: October 7, 2002Date of Patent: November 9, 2004Assignee: Broadcom CorporationInventor: Aki Shohara
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Patent number: 6804503Abstract: The present invention provides for a system for operating a communication device (20) for reception of scheduled intermittent information messages (22) with a dual mode timer (70) that extends battery life. A controller (50) schedules the timer (70) to power down all idle components of the device (20) between message receptions in a power saving sleep mode to conserve battery power. During active mode when the device is fully active in reception of messages, the timer (70) uses a reference oscillator (90) with a relatively high frequency to support digital processing by the receiver (26). During sleep mode when only the timer is powered on, a much lower frequency sleep oscillator (96) is used to maintain the lowest possible level of power consumption within the timer itself. The timer (70) has provision for automatic temperature calibration to compensate for timing inaccuracies inherent to the low-power low-frequency crystal oscillator (96) used for the sleep mode.Type: GrantFiled: October 15, 2002Date of Patent: October 12, 2004Assignee: Broadcom CorporationInventors: Aki Shohara, Emilia Vailun Lei
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Publication number: 20040120434Abstract: A system for implementing Incremental Redundancy (IR) operations in a wireless receiver includes a baseband processor, an equalizer, a system processor, and an IR processing module. The baseband processor receives an analog signal corresponding to a data block and samples the analog signal to produce samples. The equalizer receives the samples from the baseband processor, equalizes the samples, and produces soft decision bits corresponding to the data block. The equalizer may be implemented as a distinct processing component or may be performed by the baseband processor or system processor. The system processor receives at least the soft decision bits and initiates IR operations. The IR processing module receives the soft decision bits of the data block and performs IR operations on the data block in an attempt to correctly decode a corresponding data block.Type: ApplicationFiled: December 9, 2003Publication date: June 24, 2004Inventors: Li Fung Chang, Nelson Sollenberger, Yongqian Wang, Aki Shohara, Yue Chen
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Publication number: 20030119503Abstract: The present invention provides for a system for operating a communication device (20) for reception of scheduled intermittent information messages (22) with a dual mode timer (70) that extends battery life. A controller (50) schedules the timer (70) to power down all idle components of the device (20) between message receptions in a power saving sleep mode to conserve battery power. During active mode when the device is fully active in reception of messages, the timer (70) uses a reference oscillator (90) with a relatively high frequency to support digital processing by the receiver (26). During sleep mode when only the timer is powered on, a much lower frequency sleep oscillator (96) is used to maintain the lowest possible level of power consumption within the timer itself. The timer (70) has provision for automatic temperature calibration to compensate for timing inaccuracies inherent to the low-power low-frequency crystal oscillator (96) used for the sleep mode.Type: ApplicationFiled: October 15, 2002Publication date: June 26, 2003Inventors: Aki Shohara, Emilia Vailun Lei
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Publication number: 20030087617Abstract: The present invention provides for a system and method for improvement of radio transmitter and receiver frequency accuracy for a local radio communication unit that communicates digital data with a remote communication unit. In the local unit the received radio signal is down-converted, and converted to complex baseband digital samples by an analog-to-digital converter. A downlink digital phase rotator applies a fine frequency shift to the samples in accordance with a receiver frequency offset command. The resultant baseband signal is used by the data demodulator and by a receiver frequency error estimator to obtain receiver frequency errors. A data modulator generates baseband complex samples which are shifted in carrier frequency by an integrated uplink digital phase rotator in accordance with a transmitter frequency offset command. The modulated samples are then converted by a digital-to-analog converter and upconverted in frequency for radio transmission to the remote unit.Type: ApplicationFiled: October 7, 2002Publication date: May 8, 2003Inventor: Aki Shohara
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Patent number: 6473607Abstract: The present invention provides for a system for operating a communication device (20) for reception of scheduled intermittent information messages (22) with a dual mode timer (70) that extends battery life. A controller (50) schedules the timer (70) to power down all idle components of the device (20) between message receptions in a power saving sleep mode to conserve battery power. During active mode when the device is fully active in reception of messages, the timer (70) uses a reference oscillator (90) with a relatively high frequency to support digital processing by the receiver (26). During sleep mode when only the timer is powered on, a much lower frequency sleep oscillator (96) is used to maintain the lowest possible level of power consumption within the timer itself. The timer (70) has provision for automatic temperature calibration to compensate for timing inaccuracies inherent to the low-power low-frequency crystal oscillator (96) used for the sleep mode.Type: GrantFiled: April 30, 1999Date of Patent: October 29, 2002Assignee: Broadcom CorporationInventors: Aki Shohara, Emilia Vailun Lei
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Patent number: 6463266Abstract: The present invention provides for a system and method for improvement of radio transmitter and receiver frequency accuracy for a local radio communication unit that communicates digital data with a remote communication unit. In the local unit the received radio signal is down-converted, and converted to complex baseband digital samples by an analog-to-digital converter. A downlink digital phase rotator applies a fine frequency shift to the samples in accordance with a receiver frequency offset command. The resultant baseband signal is used by the data demodulator and by a receiver frequency error estimator to obtain receiver frequency errors. A data modulator generates baseband complex samples which are shifted in carrier frequency by an integrated uplink digital phase rotator in accordance with a transmitter frequency offset command. The modulated samples are then converted by a digital-to-analog converter and upconverted in frequency for radio transmission to the remote unit.Type: GrantFiled: January 5, 2000Date of Patent: October 8, 2002Assignee: Broadcom CorporationInventor: Aki Shohara