
{"publication_number": "US-4893265-A", "abstract": "a finite impulse response digital filter includes a first selector for alternately selecting samples of first and second data streams at intervals t , a second selector for alternately selecting samples of the first and second data streams at intervals t in a manner complementary to the first selector . first and second subfilters are clocked at frequency 1 / t and respectively responsive to the outputs of the first and second selectors . the subfilters comprise a common register network for introducing different incremental delay times to the outputs of the first and second selectors and supply the delayed signals to a demultiplexer .", "application_number": "US-79514785-A", "description": "before going into detail of the present invention , the underlying principle of the present invention will first be described . assume that the sampling frequency of the input digital data sftream is 1 / t and exp {- j\u03c9t 