The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 12, 1997
Filed:
Apr. 17, 1995
Dennis L Wilson, Palo Alto, CA (US);
M Campbell Smith, Santa Clara, CA (US);
Other;
Abstract
A filtering technique that results in improved performance of interpolating filters. The improved filter and technique replicates samples of the digital input signal instead of inserting zeroes before smoothing to eliminate undesired images of the sampled input signal. The filter includes a digital equivalent of a sample and hold for sampling the digital input signal at the input sample rate and for replicating the sampled digital input signal a predetermined number of times to increase the sample rate by an integer multiple and produce replicated samples of the input signal. A smoothing filter is coupled to the digital sample and hold for smoothing the replicated samples. The smoothing filter has a shape having a high frequency enhancement followed by a sharp cutoff that compensates for the replicated samples of the input signal. Interpolated digital output signals are provided therefrom that are at a sample rate higher than the input sample rate.