Patents by Inventor Chuan An CHANG

Chuan An CHANG 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).

  • Fixed-coefficient variable prime length recursive discrete Fourier transform system
    Patent number: 8924452
    Abstract: A fixed-coefficient variable prime length recursive discrete Fourier transform system includes a pre-processing device, a real-part computation device, an imaginary-part computation device and a post-processing device. The pre-processing device receives N digital input signals and performs order permutation operation to generate first and second temporal signals, wherein N is a prime number. The real-part computation device receives the real part of the first and second temporal signals and performs discrete cosine/sine transform to generate third and fourth temporal signals. The imaginary-part computation device receives the imaginary part of the first and second temporal signals and performs discrete cosine/sine transform to generate fifth and sixth temporal signals.
    Type: Grant
    Filed: July 25, 2012
    Date of Patent: December 30, 2014
    Assignee: National Cheng Kung University
    Inventors: Sheau-Fang Lei, Shin-Chi Lai, Chuan-An Chang
  • Fixed-Coefficient Variable Prime Length Recursive Discrete Fourier Transform System
    Publication number: 20130173680
    Abstract: A fixed-coefficient variable prime length recursive discrete Fourier transform system includes a pre-processing device, a real-part computation device, an imaginary-part computation device and a post-processing device. The pre-processing device receives N digital input signals and performs order permutation operation to generate first and second temporal signals, wherein N is a prime number. The real-part computation device receives the real part of the first and second temporal signals and performs discrete cosine/sine transform to generate third and fourth temporal signals. The imaginary-part computation device receives the imaginary part of the first and second temporal signals and performs discrete cosine/sine transform to generate fifth and sixth temporal signals.
    Type: Application
    Filed: July 25, 2012
    Publication date: July 4, 2013
    Inventors: Sheau Fang LEI, Shin Chi LAI, Chuan An CHANG