Patent ID: 6018754
Filing Date: 2000-01-25
Classification: H03H

Abstract:
A digital signal filter bank device for filtering an external input signal to generate a filtered digital output signal, the device comprising:an input signal selector to select between the external input signal and a low-pass filtered feedback signal to provide a filter input signal;a filter bank to receive the filter input signal and to filter the filter input signal to concurrently generate both a high-pass filtered signal and a low-pass filtered signal, wherein the low-pass filtered signal includes a low-pass filtered output signal and the low-pass filtered feedback signal; anda frequency band selector to receive both the high-pass filtered signal and the low-pass filtered output signal directly from the filter bank to generate the filtered digital output signal;wherein the filter bank includes a logic circuit to apply a distributed arithmetic algorithm to the filter input signal to generate first and second summations of product terms respectively representing the high-pass filtered signal and the low-pass filtered signal; andwherein the filter bank further includes a low-pass filter to generate the low-pass filtered feedback signal using a decimated sampling rate.