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| United States Patent | 5983253 |
| Link to this page | http://www.wikipatents.com/5983253.html |
| Inventor(s) | Fischer; Stephen A. (Boudler Creek, CA), Mennemeier; Larry M. (Boudler Creek, CA), Peleg; Alexander D. (Carmelia, IL), Dulong; Carole (Saratoga, CA), Kowashi; Eiichi (Ibaraki, JP) |
| Abstract | A method and apparatus for performing complex digital filters. According to
one aspect of the invention, a computer system generally having a
transmitting unit, a processor, and a storage device is described. The
storage device is coupled to the processor and has stored therein a
routine. When executed by the processor, the routine causes the processor
to perform a digital filter on unfiltered data items using complex
coefficients to generate an output data stream. Execution of the routine
causes the processor to perform outer and inner loops. The outer loop
steps through corresponding relationships between the complex coefficients
and the unfiltered data items. Each of these corresponding relationships
is used by the digital filter to generate the output data stream. The
inner loop steps the complex coefficients. Within the inner loop, the
unfiltered data item corresponding to the current complex coefficient is
determined according to the current corresponding relationship. Then, in
response to receiving an instruction, eight data elements are read and
used to generate a currently calculated complex number. As a result of the
manner in which these eight data elements are stored, the currently
calculated complex number represents the product of the current complex
coefficient and its corresponding unfiltered data item. The currently
calculated complex number is then added to the current output packed data.
As a result, the current output packed data stores the sum of the complex
numbers generated in the current inner loop. |
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Title Information  |
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Drawing from US Patent 5983253 |
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Computer system for performing complex digital filters |
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| Publication Date |
November 9, 1999 |
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| Filing Date |
December 20, 1995 |
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| Parent Case |
The present application is a continuation-in-part of application Ser. No.
08/523,211, titled A METHOD AND APPARATUS FOR PERFORMING DIGITAL FILTERS
ON COMPLEX DATA, filed Sep. 5, 1995 now abandoned. |
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Title Information |
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