Patents by Inventor Ray Blackham

Ray Blackham 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).

  • Method and apparatus for measuring a transfer function
    Patent number: 4713782
    Abstract: A transfer function analyzer measures the real and imaginary parts of the Fourier transform of a stimulus signal applied to a device and of a resulting response signal. The integration which is performed as part of the Fourier transformation is performed as a summation of a central sector of discrete data points within the period of integration plus the products of the coefficients of weighting polynomials multiplied by preceding and succeeding sectors of data points beyond the central sector. An accurate integration is obtained whether or not the period of integration begins or ends upon discrete data points.
    Type: Grant
    Filed: August 23, 1984
    Date of Patent: December 15, 1987
    Assignee: Hewlett-Packard Company
    Inventor: Ray Blackham