Patent ID: 7636747
Filing Date: 2009-12-22
Classification: H03H

Abstract:
1. A digital low-pass filter comprising: a first subtracter that outputs a signal obtained by subtracting a first feedback term from an input signal; a first multiplier that outputs a signal obtained by multiplying the output signal from the first subtracter by a constant k a first delay unit that outputs a signal obtained by delaying an input signal by a predetermined sampling time; a first adder that outputs a signal obtained by adding the output signal from the first multiplier to the output signal from the first delay unit, wherein the output signal from the first adder is supplied to the first delay unit; a second subtracter that outputs a signal obtained by subtracting the first feedback term from the output signal from the first adder; a second multiplier that outputs a signal obtained by multiplying the output signal from the second subtracter by a constant k a second delay unit that outputs, as the first feedback term, a signal obtained by delaying an input signal by a predetermined sampling time; and a second adder that outputs a signal obtained by adding the output signal from the second multiplier to the output signal from the second delay unit, wherein the output signal from the second adder is supplied to the second delay unit.