A reconfigurable processing unit for a digital hearing instrument includes
an IS processor module, a plurality of processing units and a crosspoint
switch matrix. The IS processor module receives a hearing instrument
configuration. Each of the processing modules are configured to process
audio signals received by the digital hearing instrument. The crosspoint
switch matrix is coupled to the IS processor module and each of the
processing modules, and includes at least one crosspoint switch that is
configured to route audio signals between processing modules and to
combine at least two audio signals. In addition, the IS processor module
uses the hearing instrument configuration to program the configuration of
the crosspoint switch and thereby control how the crosspoint switch
matrix routes and combines audio signals.