Patents by Inventor Huihung Chang

Huihung Chang 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).

  • Frequency shift keying demodulator robust for frequency offset
    Patent number: 7439799
    Abstract: A frequency shift keying demodulator robust for frequency offset is provided. The demodulator is used to enable the signal to be received correctly when the frequency offset occurs. A microprocessor of demodulator controls a frequency mixer and a phase difference generator according to the duty cycle of the preamble when receiving the preamble of the demodulated signal. Therefore, the duty cycle of the preamble of the demodulated signal can be close to 50%, and the data from a transmitter is received correctly.
    Type: Grant
    Filed: October 19, 2005
    Date of Patent: October 21, 2008
    Assignee: Novatek Microelectronics Corp.
    Inventors: Wun-Chi Lin, Huihung Chang
  • Frequency shift keying demodulator robust for frequency offset
    Publication number: 20070046813
    Abstract: A frequency shift keying demodulator robust for frequency offset is provided. The demodulator is used to enable the signal to be received correctly when the frequency offset occurs. A microprocessor of demodulator controls a frequency mixer and a phase difference generator according to the duty cycle of the preamble when receiving the preamble of the demodulated signal. Therefore, the duty cycle of the preamble of the demodulated signal can be close to 50%, and the data from a transmitter is received correctly.
    Type: Application
    Filed: October 19, 2005
    Publication date: March 1, 2007
    Inventors: Wun-Chi Lin, Huihung Chang