Patents by Inventor Cynthia Lin

Cynthia Lin 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).

  • Timing loop and method filter for a digital communications system
    Patent number: 6975676
    Abstract: A timing loop is used in a data communications receiver to time lock the receiver to a transmitter sending data across a communications loop, where the receiver includes a linear equalizer for correcting signal distortion associated with the communications loop. The timing loop includes a timing equalizer filter functionally positioned to provide an equalized signal to the phase detector portion of the timing loop. After the linear equalizer trains, the equalizer coefficients are copied to the timing equalizer.
    Type: Grant
    Filed: September 25, 2000
    Date of Patent: December 13, 2005
    Assignee: Adtran, Inc.
    Inventors: Richard L. Goodson, Steven R. Blackwell, Ayman Ghobrial, Cynthia Lin
  • Timing device and method using a timing equalizer filter for a digital communications systems
    Patent number: 6876696
    Abstract: A method of training and operating a dual-duplex, four-wire communications system to provide for time alignment in the receivers of data that is time aligned in the transmitters, even in the presence of a differential transmission delay in the wire pairs. In a training mode, a known sequence of training data is concurrently sent across each wire pair such that equalizers in the receivers are forced to train together. After the equalizers have been trained to eliminate the differential delay, the system is switched to a data mode.
    Type: Grant
    Filed: September 25, 2000
    Date of Patent: April 5, 2005
    Assignee: Adtran, Inc.
    Inventors: Richard L. Goodson, Steven R. Blackwell, Ayman Ghobrial, Cynthia Lin
  • SHDSL over POTS
    Publication number: 20030123487
    Abstract: Techniques that allow SHDSL-based systems to share the same transmission line with low frequency voice services such as POTS are disclosed.
    Type: Application
    Filed: June 28, 2002
    Publication date: July 3, 2003
    Inventors: Steven R. Blackwell, Farrokh Rashid-Farrokhi, Cynthia Lin