Patents by Inventor David Mandelstam

David Mandelstam 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).

  • Telecommunication system and method of synchronization
    Patent number: 8351583
    Abstract: The telecommunication system for communication between PSTN and analog FAXes and/or analog phones by using separated passes for data and synchronization clock flow.
    Type: Grant
    Filed: May 20, 2008
    Date of Patent: January 8, 2013
    Inventors: David Mandelstam, Michael Feldman
  • Telecommunication system and method of synchronization
    Publication number: 20090290197
    Abstract: The telecommunication system for communication between PSTN and analog FAXes and/or analog phones by using separated passes for data and synchronization clock flow.
    Type: Application
    Filed: May 20, 2008
    Publication date: November 26, 2009
    Inventors: David Mandelstam, Michael Feldman
  • Echo Canceller Controller
    Publication number: 20060280135
    Abstract: An apparatus and method for disabling an echo canceller in a communication channel is external to the echo canceller. The average power of the received signal is compared to the average power of the transmitted signal and if the received signal is more than 26 dB below the transmitted signal, then it is determined that echo cancellation is not required. If the received signal is less than 6 dB below the transmitted signal, then there is double talk present and a determination can not be made. The invention provides a low cost system for controlling echo cancellers and can continue to monitor echo during a call. The invention is well suited to implementation on a field programmable gate array (FPGA) or application specific integrated circuit (ASIC).
    Type: Application
    Filed: June 9, 2006
    Publication date: December 14, 2006
    Inventor: David Mandelstam