The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 20, 1989
Filed:
Jul. 15, 1987
Soenke Mehrgardt, March, DE;
Bernhard Ehret, Freiburg, DE;
Deutsche ITT Industries GmbH, Freiburg, DE;
Abstract
The signal path of a nonrecursive digital filter contains a series combination of like delay elements each providing a delay equal to the period of a clock signal or to a multiple thereof, each of the delay elements having a subtracter and a read-only memory associated therewith. The minuend inputs of each of the subtracters associated with the first half of delay elements is connected to the input of the associated delay element, and that of each of the substracters associated with the second half of delay elements to the output of the associated delay element, while the subtrahend inputs of all subtracters are connected to the center tap of the series combination of delay elements and to the first input of an adder. The output of each of the subtracters is coupled to the address input of the associated read-only memory, which has its output connected to one of the inputs of a multiple-input adder. The output of the latter is fed to the second input of the adder. Each read-only memory contains the function e=bd, where d is the output signal of the subtracter, and b is a value dependent on the difference between the center-tap signal value and the input-signal value of the respective delay element of the first half of delay elements or the output-signal value of the respective delay element of the second half. This digital filter shows adaptive behavior.