Patents by Inventor Lawrence Rigby

Lawrence Rigby 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).

  • Sample rate conversion by controlled selection of filter outputs
    Patent number: 7864080
    Abstract: A sample rate converter in which filtering is decomposed into phases as permitted by zero padding is described. The outputs of the phases are issued in the correct sequence to provide the resampled sequence.
    Type: Grant
    Filed: December 29, 2008
    Date of Patent: January 4, 2011
    Assignee: Altera Corporation
    Inventors: Suleyman Sirri Demirsoy, Lawrence Rigby, Benjamin Esposito
  • Adaptive quantizer
    Patent number: 7751638
    Abstract: A quantizer can be used to adjust the number of bits representing each sample value in a signal. Then, each received sample is allocated to one of a number of bins, with each bin corresponding to one of the possible quantizer output values. The quantizer can be used for providing a digital signal with a required number of bits, and the quantization interval can be adjusted. The quantization is performed in multiple stages. In a first stage, a received signal is compared with a first threshold value. In subsequent stages, the received signal is compared with respective threshold values, with the threshold value for each stage being calculated on the basis of the comparison result of the previous stage, and on the basis of an adjustable quantization interval. The quantized value is formed from the one-bit results from the comparison operations.
    Type: Grant
    Filed: September 15, 2006
    Date of Patent: July 6, 2010
    Assignee: Altera Corporation
    Inventor: Lawrence Rigby