VARIABLE RATE RECTANGULAR MATCHED FILTER

摘要

A novel variable rate near perfect ractangular matched filter (Fig. 2) is provided with a low pass filter (22) coupled to the input symbol data stream (11). The output of the filter is coupled to a sampler (24) and the output (25) of the sampler (24) is coupled to an analog to digital converter (26) to provided digital samples (at 27) indicative of the data stream at a time occuring between input data symbols. The output (27) of the analog to digital converter (26) is applied to a digital adder (28) which has a filter correction input (at 32) factor to adjust the output (at 33) of the digital adder (28) so that the digital samples approximate very closely the output of a perfect rectangular matched filter (Fig. 1).