A method for suppressing impulse noises is provided. The method is employed to receive a sample stream x[n], and to detect and suppress the interruption of impulse noise to the samples, wherein the sample stream x[n] includes a plurality of samples and n represents a discrete-time independent variable. The method includes comparing the energy sum of a (k-1).sup.th sample and a k.sup.th sample multiplied by a first constant with a first threshold, comparing energy sum of the k.sup.th sample and a (k+1).sup.th sample multiplied by a second constant with a second threshold while the energy sum of the (k-1).sup.th sample and the k.sup.th sample multiplied by the first constant is greater than the first threshold, and replacing the k.sup.th sample with a first replacement sample to output while the energy sum of the k.sup.th sample and the (k+1).sup.th sample multiplied by the second constant is greater than the second threshold.