Patent ID: 6271778
Filing Date: 2001-08-07
Classification: H03H

Abstract:
Apparatus for providing selective high pass filtering of two associated digital signals, the apparatus comprising:a first signal processing module that receives a first digital signal and passes the first signal through a first filtering module, through a second filtering module or through a third filtering module, depending upon the value of a switching command, to produce a first filtered signal;a second signal processing module that receives a second digital signal and passes the second signal through a fourth filtering module, through a fifth filtering module or through a sixth filtering module, depending upon the value of the switching command, to produce a second filtered signal; andwherein the first and fourth filtering modules comprise substantially identical high pass filters, the second and fifth filter modules comprise substantially identical all-pass filters, and the third and sixth filtering modules provide no filtering of a signal, and wherein the first and second signals may be passed through the following pairs of filter modules: first and fourth filter modules, second and fourth filter modules, first and fifth filter modules, and third and sixth filter modules.