| 摘要 |
This invention concerns apparatus for filtering signals. Means are provided for emphasizing only some of the frequency components of signals with respect to others. The invention has particular application where the signal to be applied to the filter consists of a set of data obtained by sampling the amplitude of the signal at substantially equal time intervals, i.e., digitized data. In this context, I provide apparatus for extremely high speed digital filtering. Automatically the terms in the equation ARE CARRIED OUT BY RECURSION, OR A COMBINATION OF FEED FORWARD AND FEED BACK TERMS. The quantities ai and bj are stored in a register. Values bj are automatically called out as appropriate, multiplied by the previous values of the coefficient yn, i.e., yn-j (which is the recursive part) and summed, while the coefficients ai are called out and multiplied by the appropriate value of x, then the total summation is made. The apparatus involves both storage means, means for reading out the various values involved, multiplying them together, accumulating them and using a recursive path by which input data can be re-stored in a particular register, as desired.
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