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:
Dec. 05, 2017
Filed:
Mar. 26, 2015
Altera Corporation, San Jose, CA (US);
Colman C. Cheung, San Diego, CA (US);
Altera Corporation, San Jose, CA (US);
Abstract
Decimation filter circuitry may include polyphase filtering structures that perform decimation filtering using filter coefficients. Generic polyphase filtering structures do not take advantage of symmetries between the corresponding filter coefficients. If desired, the arrangement of the polyphase filtering structures in the decimation filter circuitry may be optimized relative to generic polyphase filtering structures to take advantage of corresponding filter coefficient symmetries, thereby allowing for implementation of dynamic decimation ratios and a dynamic number of channels while reducing the number of required multipliers by half with respect to generic polyphase filters. Decimation filters may include pre-adder circuitry that receives first and second portions of a data stream and adds corresponding samples from the first and second portions to generate pre-added values. Convolving circuitry may generate filtered output data by convolving the pre-added values with corresponding filter coefficients based on symmetry of the filter coefficients.