Patents by Inventor Mandeep Chadha

Mandeep Chadha 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: 20060039550
    Abstract: An echo canceling system, method of attenuating echo, and a bit pump and transceiver employing the system and method. The echo canceling system is couplable between a transmit and receive path of the bit pump and receives and attenuates the echo in a receive signal propagating along the receive path. In one embodiment, the echo canceling system includes a slave echo canceling stage that employs a filter coefficient to attenuate the echo. The echo canceling system also includes a separation circuit, coupled to the slave echo canceling stage, that generates data representing a residual echo substantially exclusive of the receive signal. The echo canceling system still further includes a master echo canceling stage, coupled to the separation circuit, that receives the data and modifies the filter coefficient based thereon.
    Type: Application
    Filed: August 5, 2005
    Publication date: February 23, 2006
    Applicant: Lucent Technologies Inc.
    Inventors: Mandeep Chadha, Shawn McCaslin, Mile Milisavljevic
  • Patent number: 6088445
    Abstract: An adaptive filter is provided which has fixed point or floating point data stored in a data RAM (74) and block scale floating point coefficients stored in a coefficient RAM (84). The data and coefficients are utilized in a filter algorithm which utilizes a multiplier and an accumulator to provide a convolution result. Coefficients are updated by adding the multiplied result of the data RAM value and the error value to the old value of the coefficient. This is done for all the coefficient values in the coefficient RAM. The error value indicates the difference between the filter output and the sampled near-end signal that is the echo. These new coefficients are examined and if any have a value above or all have a value below a predetermined threshold, then the mantissas of all the coefficients are shifted and the exponent adjusted in the next filter cycle.
    Type: Grant
    Filed: August 1, 1997
    Date of Patent: July 11, 2000
    Assignee: Crystal Semiconductor Corp.
    Inventors: Mandeep Chadha, Shawn Robert McCaslin, John Camagna, Nariankadu Datatreya Hemkumar