Patents by Inventor Sassan Ahmadi

Sassan Ahmadi 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).

  • Publication number: 20080095195
    Abstract: A method and system for partitioning frames into sub-frames, where the frames may be defined according to a reference system standard, and transmitting one or more sub-frames during a pre-designated downlink transmission, and transmitting one or more sub-frames during a pre-designated uplink transmission. A method and system for partitioning frames into sub-frames, transmitting one or more sub-frames including a legacy preamble for communicating with a legacy terminal operating according to a reference system standard during a pre-designated legacy transmission period, and transmitting sub-frames including a supplemental preamble for communicating with a non-legacy terminal operating according to the evolved version of the reference system standard during a pre-designated non-legacy transmission period.
    Type: Application
    Filed: October 17, 2007
    Publication date: April 24, 2008
    Inventors: Sassan Ahmadi, Hujun Yin
  • Patent number: 6625226
    Abstract: A variable bit rate coder, and an associated method, for encoding a frame of speech, such as frames of data generated during operation of a communication station operable in a cellular communication system. Selection of the coding rate is made responsive to indicia of actual coding performance of a coder at more than one coding rate.
    Type: Grant
    Filed: December 3, 1999
    Date of Patent: September 23, 2003
    Inventors: Allen Gersho, Vladimir Cuperman, Jan Linden, Ajit V. Rao, Sassan Ahmadi, Fenghua Liu, Ryan Heidari
  • Patent number: 6311154
    Abstract: A speech coder and a method for speech coding wherein the speech signal is represented by an excitation signal applied to a synthesis filter. The speech is partitioned into frames and subframes. A classifier identifies which of several categories the speech frame belongs to, and a different coding method is applied to represent the excitation for each category. For some categories, one or more windows are identified for the frame where all or most of the excitation signal samples are assigned by a coding scheme. Performance is enhanced by coding the important segments of the excitation more accurately. The window locations are determined from a linear prediction residual by identifying peaks of the smoothed residual energy contour. The method adjusts the frame and subframe boundaries so that each window is located entirely within a modified subframe or frame.
    Type: Grant
    Filed: December 30, 1998
    Date of Patent: October 30, 2001
    Assignee: Nokia Mobile Phones Limited
    Inventors: Allen Gersho, Vladimir Cuperman, Ajit V Rao, Tung-Chiang Yang, Sassan Ahmadi, Fenghua Liu