Abstract
A first and a second input signal, constituting a stereophonic pair are amplified in respective direct amplifier means so as to obtain a first and a second output signal. In order to obtain the expansion of the stereo base, said output signals are added by adder means in a desired phase relationship, chosen between phase coincidence and phase opposition, and the sum signal thus produced is processed by a feedback block having a desired transfer function, and is then superimposed on the first input signal with opposite phase, and is superimposed on said second input signal with opposite or equal phase, according to whether said output signals are added respectively in phase coincidence of phase opposition. The feedback block preferably includes a band pass filter, and its gain is externally programmable.
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