Patent ID: 7983908

Claim:
A noise-canceling device of a voice communication terminal that cancels noise elements included in a received packetized voice signal received through a packet-based communication network, comprising: a digital filter array that exhibits a filter quality by combining a plurality of filter qualities of a plurality of digital filters, wherein: the digital filter array including a first-stage digital filter that receives the received voice signal as well as a plurality of later-stage digital filters coupled thereto in linear succession; and each digital filter of the digital filter array exhibits a respective filter quality in response to a filter coefficient signal containing a plurality of respective supplied arrays of filter coefficients; a filter qualities designator configured to receive an input that designates each of the filter qualities of the plurality of digital filters forming the array, and generates a filter-quality designation signal based on a received designator input; a filter coefficient setter that retains a plurality of filter coefficient arrays, extracts a filter coefficient array from among the plurality of filter coefficient arrays based on the filter-quality designation signal, supplies a respective filter coefficient array to each of the plurality of digital filters as a filter coefficient signal, whereby the plurality of filters of the digital filter array collectively exhibit a filter quality that is not exhibited by each of the plurality of filters according to the respective filter coefficient array; a plurality of on/off switch elements connected between each input and output of each digital filter of the array of digital filters; and a switch driver that selectively drives the on/off switch elements; wherein: the filter qualities designator includes a filter type selection section that selects the type of the filter for each of the plurality of digital filters such that the digital filters function as a low-pass filter or a high-pass filter, and a cutoff frequency selection section that selects the cutoff frequency of each of the plurality of digital filters; and the switch driver forms a bypass path by driving the on/off switch elements that correspond to the digital filters for which filter quality has not been designated by the filter qualities designator.