Modified integrate and dump filter

Claim 1

A nonrecursive filter to modify the characteristic of an integrate and dump filter comprising: variable delay means having an input terminal, an output terminal and a plurality of control terminals and being operative to delay a signal at its input terminal in selected increments of predetermined magnitude, the particular increment selected being determined by which of said control terminals is enabled; timing means having a plurality of output connections, each being coupled to a separate one of said control terminals and being operative to selectively generate enabling signals at its output connections to thereby select an increment of delay of particular magnitude in said variable delay means; and an integrate and dump filter means having an input connection coupled to the output connection of said variable delay means and an output connection and being operative to accumulate over a predetermined time interval the sum of the signals from said variable delay means; said variable delay means including a plurality of gates, each having a first input connection connected to a separate one of said plurality of control terminals, a second input connection, and an output connection coupled to said integrate and dump filter means, each of said plurality of gates being operative to pass a signal at its second input connection to said integrate and dump filter means upon the receipt of an enabling signal at its first input connection; and a plurality of delay paths, each path having an input connection connected to said input terminal of said variable delay means, and an output connection connected to a separate one of the second input connections of said plurality of gates and each path being operative to delay a signal at said input terminal an increment of predetermined magnitude before directing said signal to said integrate and dump filter means.