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: 20070053278
    Abstract: A method for calculating a metric indicating a symmetry of a signal waveform includes inverting the signal waveform to produce an inverted signal waveform; measuring a first set of peak, bottom, and average values corresponding to the signal waveform by detecting a peak value of the signal waveform, detecting a bottom value of the signal waveform, and detecting an average value of the signal waveform; measuring a second set of peak, bottom, and average values of the inverted signal waveform by detecting a peak value of the inverted signal waveform, detecting a bottom value of the inverted signal waveform, and detecting an average value of the inverted signal waveform; and calculating the metric indicating the symmetry of the signal waveform according to the first set of peak, bottom, and average values of the signal waveform, and the second set of peak, bottom, and average values of the inverted signal waveform.
    Type: Application
    Filed: July 31, 2006
    Publication date: March 8, 2007
    Inventors: Wei-Hsuan Tu, Tse-Hsiang Hsu
  • Publication number: 20060227734
    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: Application
    Filed: April 8, 2005
    Publication date: October 12, 2006
    Inventors: Kuang-Hsuan Tu, Nagabhushana Kurapati
  • Patent number: 7099788
    Abstract: The present invention discloses a multiphase waveform generator capable of performing phase calibration, and a related phase calibration method. The disclosed multiphase waveform generator includes a multiphase waveform generating module and a calibrating module. The multiphase waveform generating module receives an input signal and shifts edges of the input signal by a delay time according to a delay parameter to generate a phase-modified signal. The calibrating module is coupled to the multiphase waveform generating module for calibrating the delay time to reduce a difference between a characteristic value of the phase-modified signal and an expected value, which is calculated according to the delay parameter and characteristic values of a first and a second predetermined periodic signal.
    Type: Grant
    Filed: April 28, 2005
    Date of Patent: August 29, 2006
    Assignee: Mediatek Incorporation
    Inventors: Tse-Hsiang Hsu, Wei-Hsuan Tu
  • Publication number: 20050246141
    Abstract: The present invention discloses a multiphase waveform generator capable of performing phase calibration, and a related phase calibration method. The disclosed multiphase waveform generator includes a multiphase waveform generating module and a calibrating module. The multiphase waveform generating module receives an input signal and shifts edges of the input signal by a delay time according to a delay parameter to generate a phase-modified signal. The calibrating module is coupled to the multiphase waveform generating module for calibrating the delay time to reduce a difference between a characteristic value of the phase-modified signal and an expected value, which is calculated according to the delay parameter and characteristic values of a first and a second predetermined periodic signal.
    Type: Application
    Filed: April 28, 2005
    Publication date: November 3, 2005
    Inventors: Tse-Hsiang Hsu, Wei-Hsuan TU
  • Patent number: 5777578
    Abstract: The global positioning system (GPS) compass is consisted of three main units. These units are the pointer, the sensor, and the controller. The pointer unit is comprised of an iron frame, an aluminum bar, and two aluminum plates. The sensor unit is comprised of global positioning system (GPS) receivers and global positioning system (GPS) antennas. The controller unit includes a personal computer, a stepping motor, several data interface circuit boards, and some motor control circuit boards. The baseline of the pointer is an aluminum bar of about one meter long. The sensor unit can measure the baseline's azimuth angle relative to the local coordinate. When command is received, the controller unit is capable of turning the aluminum bar to the desired direction by the aid of the stepping motor. There are two modes for operation available. One is the initial mode, the other is the normal mode. It takes about one or two minutes to complete the initial mode operation.
    Type: Grant
    Filed: February 10, 1997
    Date of Patent: July 7, 1998
    Assignee: National Science Council
    Inventors: Fan-Ren Chang, Li-Sheng Wang, Chi-Hsuan Tu, Yen-Weay Shei, Kun-Yuan Tu, Ching-Di Chang