Adaptive recursive least mean square error filter

Registers – Transfer mechanism – Traveling pawl

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328167, 333 18, 333 70T, G06F 1534, H04B 304

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active

040385361

ABSTRACT:
An adaptive recursive filter is disclosed which, in a preferred embodiment, comprises first and second adaptive transversal filters selectively coupled together to minimize the mean square error of the output data of the recursive filter based upon observations of input data to the recursive filter. Each transversal filter includes a tapped delay line with a variable weight on each tap. The output data of the recursive filter is developed by combining the outputs of the first and second transversal filters. The input data is applied to the first transversal filter, while the output data is applied to the second transversal filter. The output data is also combined with a reference signal to provide an error signal. A function of that error signal is utilized to update the weights of all of the taps in both transversal filters in order to cause the weights to automatically adapt themselves to minimize the mean square error of the output data of the recursive filter.

REFERENCES:
patent: 3508172 (1970-04-01), Kretzmer et al.
patent: 3646480 (1972-02-01), Spaulding
patent: 3648171 (1972-03-01), Hirsch
patent: 3715670 (1973-02-01), Hirsch et al.
patent: 3755738 (1973-08-01), Gitlin et al.
patent: 3974449 (1976-08-01), Falconer

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