Cascaded comb integrator interpolating filters

摘要

A robust interpolator performs internal data correction to avoid catastrophic errors. The interpolator includes a filter connected to an integrator by both a feedforward path and an element that increases the data rate of the output of the filter. The filter processes signals arriving at an input data rate to produce differentiated data and filtered data. The filtered data represents an output of the integrator in the absence of error. The integrator receives the differentiated data from the element at a data rate higher than the input data rate, and receives the filtered data via the feedforward path. A transmultiplexer producing a wideband signal from two or more narrowband signals employs the interpolator to increase the data rate of its output.