Patents by Inventor Hsuan Tu

Hsuan Tu 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).

  • Publication number: 20140256375
    Abstract: A mobile phone is configured to employ existing antennae or other exiting input electronics to receive electromagnetic waves, for detection of energy magnitudes. The mobile phone has wireless receiver electronics to receive, through the antennae, communication signals in a plurality of different communication bands that correspond to the plurality of different frequency ranges. Energy levels of electromagnetic waves received through the plurality of antennae are detected. A record is made of energy levels in the plurality of different frequency ranges. An alarm is provided upon a detected energy level crossing a predefined threshold value.
    Type: Application
    Filed: March 10, 2013
    Publication date: September 11, 2014
    Applicant: QUALCOMM INCORPORATED
    Inventors: Hee-Jun PARK, Alex Kuang-Hsuan TU
  • Patent number: 8649306
    Abstract: The standby time of a CDMA cell phone is extended by using two receive chains to monitor the Quick Paging Channel (QPCH) when the signal-to-noise ratio falls within a predetermined range. Monitoring the QPCH saves battery power by obviating the need to monitor the general paging message unless quick paging (PI) bits are set. The QPCH is not monitored, however, in noisy environments where PI bits are incorrectly detected causing the paging message to be needlessly monitored. Power is saved by monitoring the QPCH in noisier environments without increasing the incorrect detection rate. Incorrect detection is reduced in the predetermined range by using an additional receive chain to achieve receive diversity. Although additional power is consumed by the second receive chain in the predetermined range, the power saved by not demodulating the paging message at each slot more than compensates for the additional power consumed by the second receive chain.
    Type: Grant
    Filed: August 6, 2009
    Date of Patent: February 11, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Kuang-Hsuan Tu, Nagabhushana Rao Kurapati
  • Patent number: 8553728
    Abstract: Methods, devices and computer program products are disclosed that allow for wireless communication devices to operate more robustly in the slotted mode of operation in the event of network system loss. Specifically, present aspects require the wireless device to move to or remain in the slotted mode of operation as opposed to immediately entering into a system determination/acquisition mode upon failing to acquire an active set pilot during a slotted wake-up. By moving to the slotted mode of operation or providing for additional slotted-wake-ups, a number of attempts at acquiring the active set pilot can be performed before declaring the system as lost, thereby allowing for fading channel conditions to prevail without the need to re-acquire the lost system or otherwise acquire another system. Since the performance of the slotted mode is less power intensive than acquiring or re-acquiring a system, a substantial power savings is realized.
    Type: Grant
    Filed: October 9, 2008
    Date of Patent: October 8, 2013
    Assignee: QUALCOMM Incorporated
    Inventors: Alex Kuang-Hsuan Tu, Robbin D. Hughes, Rotem Cooper
  • Patent number: 8467404
    Abstract: An apparatus for detecting the presence of a frequency channel is provided. The apparatus comprises an energy detection unit configured to measure receive energy over a first bandwidth and a second energy detection unit configured to measure receive energy over a second bandwidth. The apparatus further comprises a processor configured to compare the measured receive energy over the first bandwidth to a first energy threshold, to compare the measured receive energy over the second bandwidth to a second energy threshold, and to detect the presence of the frequency channel when the measured receive energies over the first and second bandwidths are above the first and second energy thresholds, respectively.
    Type: Grant
    Filed: March 31, 2009
    Date of Patent: June 18, 2013
    Assignee: Qualcomm Incorporated
    Inventors: Alex Kuang-Hsuan Tu, Parag Kanade, Virat Deepak
  • Publication number: 20130018183
    Abstract: A method and a device for making reducing sugar firstly combine a bio-substance containing lignocellulose with a solvent, thereby conducting a degradation reaction upon afore mixture through an autoclave so as to promote the bio-substance to solvent ratio during the production. Thus, a reducing sugar solution of a high concentration is produced. In the meantime, the bio-substance containing lignocellulose does not need a high-temperatured steaming after the degradation. Therefore, the water amount and the energy resources that are applied in the present invention are less than those of the conventional technique. Further, the autoclave is a common apparatus in the market, which facilitates in an easy purchase, decreases the producing cost, and benefits the product promotion.
    Type: Application
    Filed: July 13, 2011
    Publication date: January 17, 2013
    Inventors: Alex Chen-Chang Chang, Chiu-Yue Lin, Ying-Hsuan Tu, Ming-Hsiang Huang
  • Patent number: 8346313
    Abstract: Techniques for dynamically selecting warm-up time for a wireless device operating in the idle mode are described. At each active interval, conditions affecting warm-up of the wireless device at a next active interval are determined. The conditions may pertain to channel conditions, operating conditions, and/or hardware configuration. A warm-up time is selected based on the determined conditions. A wake-up time for the next active interval is determined based on the selected warm-up time. The wireless device then goes to sleep until the wake-up time. In one scheme, the strongest pilot acquired in each active interval is identified, and its pilot strength is averaged to obtain an average pilot strength. The average pilot strength is compared against at least one threshold, and one of at least two possible time durations is selected for the warm-up time based on the comparison result.
    Type: Grant
    Filed: August 1, 2006
    Date of Patent: January 1, 2013
    Assignee: QUALCOMM Incorporated
    Inventor: Alex Kuang-Hsuan Tu
  • Patent number: 8258830
    Abstract: An oscillator circuit is provided. The oscillator circuit includes a gated oscillator and a calibration circuit. The gated oscillator is arranged to generate an oscillator signal according to a control signal, and receive a gating signal to align an edge of the oscillator signal with an edge of the gating signal. The calibration circuit coupled to the gated oscillator is arranged to receive a first clock signal and a second clock signal, detect an alignment operation of the gated oscillator according to the first clock signal and a second clock signal and generate the control signal according to the detected alignment operation.
    Type: Grant
    Filed: July 30, 2009
    Date of Patent: September 4, 2012
    Assignee: Mediatek Inc.
    Inventors: Che-Fu Liang, Sy-Chyuan Hwu, Yu-Hsuan Tu
  • Patent number: 8249636
    Abstract: A wireless device detects for an adverse channel condition, which may be (1) a frequent out of service (FOOS) condition indicative of frequent in and out of service or (2) an unbalanced forward/reverse link condition indicative of unbalanced coverage for the forward and reverse links. A FOOS condition may be detected based on an average in-service time, the number of lost system connections, the number of systems to which connections have been made, the rate of change for the systems, the altitude of the wireless device, and/or other parameters. An unbalanced forward/reverse link condition may be detected based on the average in-service time, the number of system access failures, and/or other parameters. The wireless device performs at least one action to conserve battery power if an adverse channel condition is detected. The action(s) may include performing system acquisition less frequently, disabling system registration, performing registration less frequently, and/or going to sleep.
    Type: Grant
    Filed: March 28, 2006
    Date of Patent: August 21, 2012
    Assignee: QUALCOMM Incorporated
    Inventors: Alex Kuang-Hsuan Tu, Virat Deepak
  • Patent number: 8212702
    Abstract: A delta-sigma analog-to-digital conversion apparatus for receiving an analog input signal to generate a digital output signal includes a subtracting unit, a quantizer, and a feedback unit. The subtracting unit is utilized for performing a subtraction function to generate a subtracted signal according to the analog input signal and a feedback signal. The quantizer is coupled to the subtracting unit and utilized for performing quantization to generate a quantized signal according to the subtracted signal. The feedback unit is coupled between the subtracting unit and the quantizer, and utilized for providing the feedback signal to the subtracting unit according to the quantized signal. The subtracting unit is arranged to reduce signal input swing of the quantizer.
    Type: Grant
    Filed: April 15, 2011
    Date of Patent: July 3, 2012
    Assignee: Mediatek Inc.
    Inventors: Tse-Chi Lin, Yu-Hsuan Tu, Chang-Shun Liu, Kang-Wei Hsueh
  • Patent number: 8090395
    Abstract: A channel scanning order is dynamically created, modified, selectively ignored, or combinations thereof based on historical data, motion information, context information, alert message systems, network reselection, or combinations thereof. If a less preferred network has served a mobile device longer than a threshold amount of time, acquisition of the less preferred network is attempted before attempting acquisition of a more preferred network.
    Type: Grant
    Filed: March 12, 2009
    Date of Patent: January 3, 2012
    Assignee: QUALCOMM Incorporated
    Inventors: Francis M. Ngai, Parag Mohan Kanade, Alex Kuang-Hsuan Tu, Virat Deepak
  • Patent number: 8031097
    Abstract: A multiplying digital-to-analog converter includes an operational amplifier (OP-amp) operated under a first power supply voltage and a second power supply voltage; an OP-amp input switch block coupled to a common mode voltage for selectively coupling the common mode voltage to input nodes of the OP-amp, wherein the common mode voltage is substantially equal to the first power supply voltage; a capacitor block coupled to the OP-amp input switch block; a sampling switch block coupled to the input signal for selectively coupling the input signal to the capacitor block; a reference voltage switch block coupled to the capacitor block for selectively coupling the reference signal to the capacitor block; and a feedback switch block coupled between the capacitor block and output nodes of the OP-amp.
    Type: Grant
    Filed: April 14, 2010
    Date of Patent: October 4, 2011
    Assignee: Mediatek Inc.
    Inventors: Wei-Hsuan Tu, Tzung-Hung Kang
  • Publication number: 20110187571
    Abstract: A delta-sigma analog-to-digital conversion apparatus for receiving an analog input signal to generate a digital output signal includes a subtracting unit, a quantizer, and a feedback unit. The subtracting unit is utilized for performing a subtraction function to generate a subtracted signal according to the analog input signal and a feedback signal. The quantizer is coupled to the subtracting unit and utilized for performing quantization to generate a quantized signal according to the subtracted signal. The feedback unit is coupled between the subtracting unit and the quantizer, and utilized for providing the feedback signal to the subtracting unit according to the quantized signal. The subtracting unit is arranged to reduce signal input swing of the quantizer.
    Type: Application
    Filed: April 15, 2011
    Publication date: August 4, 2011
    Inventors: Tse-Chi Lin, Yu-Hsuan Tu, Chang-Shun Liu, Kang-Wei Hsueh
  • Patent number: 7965213
    Abstract: An element-selecting method is utilized for selecting the converting elements of the DAC to perform the digital-to-analog conversion. The element-selecting method first determines whether the selected times of the converting elements are all equal or not. When the selected times of the converting elements are all equal, the element-selecting method determines a shifting-step according to the input signal and the number of the converting elements; otherwise, the element-selecting method determines the shifting-step to be a predetermined value. The element-selecting method then selects a converting element from the DAC by means of separating the converting element from a last selected converting element by the shifting-step. In this way, the error accumulated because of the mismatch of the converting elements is eliminated, and the toggle rate of the DAC is reduced. Hence, the glitch and the dynamic errors of the DAC are reduced, improving the performance of the DAC.
    Type: Grant
    Filed: March 4, 2010
    Date of Patent: June 21, 2011
    Assignee: Mediatek Inc.
    Inventors: Chang-Shun Liu, Tse-Chi Lin, Yu-Hsuan Tu, Kang-Wei Hsueh
  • Patent number: 7953401
    Abstract: Methods and apparatus for out of service processing with varied behaviors. In an aspect, a method is provided for service acquisition. The method includes determining one or more conditions, wherein each condition is associated with at least one weight, detecting whether an out-of-service event has occurred, and if an out-of-service event is detected: identifying selected conditions and associated weights, and processing the associated weights to determine service acquisition “on” and “off” times. In an aspect, an apparatus includes condition logic configured to determine one or more conditions, wherein each condition is associated with at least one weight, and processing logic configured to detect whether an out-of-service event has occurred, and if an out-of-service event is detected, to identify selected conditions and associated weights, and process the associated weights to determine service acquisition “on” and “off” times.
    Type: Grant
    Filed: March 24, 2008
    Date of Patent: May 31, 2011
    Assignee: QUALCOMM Incorporated
    Inventors: James A. Hutchison, Parag Mohan Kanade, Bhupesh Manoharlal Umatt, Alex Kuang-Hsuan Tu, Messay Amerga, Vineet Mittal, Michael Kevin Spartz
  • Patent number: 7948414
    Abstract: A delta-sigma analog-to-digital conversion apparatus for receiving an analog input signal to generate a digital output signal includes a subtracting unit, a quantizer, and a feedback unit. The subtracting unit is utilized for performing a subtraction function to generate a subtracted signal according to the analog input signal and a feedback signal. The quantizer is coupled to the subtracting unit and utilized for performing quantization to generate a quantized signal according to the subtracted signal. The feedback unit is coupled between the subtracting unit and the quantizer, and utilized for providing the feedback signal to the subtracting unit according to the quantized signal. The subtracting unit is arranged to reduce signal input swing of the quantizer.
    Type: Grant
    Filed: August 9, 2009
    Date of Patent: May 24, 2011
    Assignee: Mediatek, Inc.
    Inventors: Tse-Chi Lin, Yu-Hsuan Tu, Chang-Shun Liu, Kang-Wei Hsueh
  • Patent number: 7924087
    Abstract: A reference buffer circuit with high driving capability is disclosed. In which, a buffering stage has a first NMOS transistor and a first PMOS transistor to provide high and low tracking voltages respectively based on a high input voltage and a low input voltage. A first driving stage is driven by the high and low tracking voltages to output a first high output voltage and a first low output voltage. A body of the first PMOS transistor is tied to a first bias voltage lower than a supply voltage for the buffering and first driving stages.
    Type: Grant
    Filed: May 20, 2008
    Date of Patent: April 12, 2011
    Assignee: Mediatek Inc.
    Inventors: Wei-Hsuan Tu, Tzung-Hung Kang
  • Publication number: 20110072295
    Abstract: Apparatus and methods are disclosed for power optimization in a wireless device. The apparatus and methods effect monitoring the amount of data stored in a data buffer that buffers data input to and data output from a processor. Dependent on the amount of data stored in the buffers parameters of a control function, such as a Dynamic Clock and Voltage Scaling (DCVS) function are modified based on the amount of data stored in the data buffer. By modifying or pre-empting the parameters of the control function, which controls at least processor frequency, the processor can process applications more dynamically over default parameter settings, especially in situations where one or more real-time activities having strict time constraints for completion are being handled by the processor as evinced by increased buffer depth. As a result, power usage is further optimized as the control function is more responsive to processing conditions.
    Type: Application
    Filed: September 23, 2010
    Publication date: March 24, 2011
    Applicant: QUALCOMM INCORPORATED
    Inventors: Reza Shahidi, Alex Kuang-Hsuan Tu, Brian J. Salsbery, Ajith T. Payyappilly, Xiaodong Chen
  • Publication number: 20110032132
    Abstract: A delta-sigma analog-to-digital conversion apparatus for receiving an analog input signal to generate a digital output signal includes a subtracting unit, a quantizer, and a feedback unit. The subtracting unit is utilized for performing a subtraction function to generate a subtracted signal according to the analog input signal and a feedback signal. The quantizer is coupled to the subtracting unit and utilized for performing quantization to generate a quantized signal according to the subtracted signal. The feedback unit is coupled between the subtracting unit and the quantizer, and utilized for providing the feedback signal to the subtracting unit according to the quantized signal. The subtracting unit is arranged to reduce signal input swing of the quantizer.
    Type: Application
    Filed: August 9, 2009
    Publication date: February 10, 2011
    Inventors: Tse-Chi Lin, Yu-Hsuan Tu, Chang-Shun Liu, Kang-Wei Hsueh
  • Patent number: 7860527
    Abstract: Techniques for operating two receivers to receive data and paging from two systems are described. A primary receiver is associated with better performance than a secondary receiver under poor RF conditions. The two receivers may be operated in either a hybrid mode in which the primary receiver is used to receive paging or a simultaneous mode in which the second receiver is used to receive paging. One of the modes may be selected for use based on RF conditions, received power, demodulation metrics, and/or other criteria. In one design, a mode is selected based on the received power and one or more thresholds. In another design, the hybrid mode is selected for poor RF conditions and, for good RF conditions, the hybrid or simultaneous mode is selected based on received power.
    Type: Grant
    Filed: May 11, 2006
    Date of Patent: December 28, 2010
    Assignee: QUALCOMM Incorporated
    Inventors: Francis Ming-Meng Ngai, Alex Kuang-Hsuan Tu, Serguei A. Glazko, Steven C. Ciccarelli
  • Patent number: 7822753
    Abstract: A level of affinity between a first user and many other users is considered when prioritizing content display when browsing, and ratings display when searching for programs in an electronic program guide or in a browser interface of a playback software application. Ratings from users who have high affinity with the first user are shown with priority over ratings from users who have low affinity with the first user. And, when browsing, programs rated highly by users having high affinity with the first user are shown with priority over programs rated poorly by the users having high affinity with the first user, and programs rated highly by users having low affinity with the first user.
    Type: Grant
    Filed: March 11, 2008
    Date of Patent: October 26, 2010
    Assignee: CyberLink Corp.
    Inventor: Pei-Hsuan Tu