Patents by Inventor Tony Siuman Lee

Tony Siuman Lee 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).

  • Method and apparatus for differentiating a wireless analog signal from a wireless digitally encoded signal
    Patent number: 5689816
    Abstract: In accordance with IS-136 standard, an analog wireless signal and a digitally encoded wireless signal can be received by a remote telecommunicating device. The remote device can differentiate between the analog wireless signal and the digitally encoded wireless signal by measuring the average energy of the signal in the portion of the baseband signal that is expected to contain the Supervisory Audio Tone signal, and the portion of the baseband signal that is expected to be outside of the audio band for an analog signal. The average energy of the portion outside of the audio band is subtracted from the average energy of the SAT signal. The difference is compared to a threshold, and based upon the comparison, the characteristic of the received wireless signal, i.e. analog or digital, is determined.
    Type: Grant
    Filed: November 2, 1995
    Date of Patent: November 18, 1997
    Assignee: Atmel Corporation
    Inventors: Tony Siuman Lee, Jong-keung Cheng