Signal processing system providing compressor/expander operation - has main or straight through signal path and further parallel path

摘要

A signal processing system for providing compressor and expander operation which includes a main, or straight through, signal path and a further signal path in parallel with it. The further path derives its input from the input to the main path or from some later point in the signal path. The output of the further signal path is combined additively with that of the main path for compressor operation and substractively for expander operation. The further signal path output is appropriately limited so that it can only make a noticeable contribution to the resultant signal level at low input signal levels. True complementarity is attainable by the use of a compressor and expander together, to provide an overall noise reduction action without introducing defects into the signal being processed.