Patents by Inventor Jianqiang Xin

Jianqiang Xin 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).

  • Modem adaptation control for facsimile over internet protocol
    Patent number: 8717873
    Abstract: Described embodiments provide an IP-aware modem, such as for use in an IP-aware facsimile machine, operable with an IP packet network. The IP-aware modem has voice-band data engine that receives packets from the packet network, converts data in the packets to PCM samples, stores the samples as PCM sample frames in a buffer for further processing by the modem, and determines for each PCM sample frame whether or not during the conversion one or more packets were missing. An equalizer or timing recovery element in the modem adapts using the PCM sample frames and suspends the adaptation for the time period of each PCM sample frame converted without the one or more missing packets. Similarly, searches of the PCM sample frames for certain modem synchronization signals are skipped when, during the search, the searched PCM sample frame was converted without the one or more missing packets.
    Type: Grant
    Filed: May 25, 2012
    Date of Patent: May 6, 2014
    Assignee: LSI Corporation
    Inventors: Ximing Chen, Herbert B. Cohen, Jianqiang Xin
  • MODEM ADAPTATION CONTROL FOR FACSIMILE OVER INTERNET PROTOCOL
    Publication number: 20130315052
    Abstract: Described embodiments provide an IP-aware modem, such as for use in an IP-aware facsimile machine, operable with an IP packet network. The IP-aware modem has voice-band data engine that receives packets from the packet network, converts data in the packets to PCM samples, stores the samples as PCM sample frames in a buffer for further processing by the modem, and determines for each PCM sample frame whether or not during the conversion one or more packets were missing. An equalizer or timing recovery element in the modem adapts using the PCM sample frames and suspends the adaptation for the time period of each PCM sample frame converted without the one or more missing packets. Similarly, searches of the PCM sample frames for certain modem synchronization signals are skipped when, during the search, the searched PCM sample frame was converted without the one or more missing packets.
    Type: Application
    Filed: May 25, 2012
    Publication date: November 28, 2013
    Inventors: Ximing Chen, Herbert B. Cohen, Jianqiang Xin
  • Phase offset detection
    Patent number: 6980618
    Abstract: A system that detects and corrects for phase offset between a subscriber and a service provider. The phase offset detection and correction system provides for improved performance of Pulse Code Modulation encoding in the upstream direction.
    Type: Grant
    Filed: August 11, 2000
    Date of Patent: December 27, 2005
    Assignee: Agere Systems Inc.
    Inventors: Shaohan J Chou, Jianqiang Xin, Jinguo Yu