Importance

Loading Importance Indicators...

Abstract

A programmable and adaptive electronic filter for filtering digital signals. The filter uses a table which contains the outputs corresponding to all possible inputs, so that the filter may be constructed of memory, adders and multiplexers, and does not require multipliers. The input sample is used as an address to determine the location in the memory which contains the output corresponding to that input. The table of outputs is placed in a particular order such that the change between the inputs corresponding to each two adjacent locations is a single digit, thus allowing the table to be easily calculated, since the difference between the outputs in those two locations is two times the weighting coefficient for the digit in the input which is changed. Adaptive filtering is accomplished by using a second filter which has as its input the difference between the actual output of the filter and the desired output, and as its output changes to the weighting coefficients of the filter.

Loading the Abstract Image...

First Claim