Apparatus and method for filtering a signal which represents a digital data stream

摘要

A signal to be produced, which represents a digital data stream, is generated using the currents or voltages from current or voltage sources selected from multiple current or voltage sources. The current or voltage sources whose currents or voltages are used to generate the signal which is to be produced are selected based on the contents of the elements of a shift register whose input connection has the signal which is to be filtered applied to it.