If you have a stereo signal which is suffering cross-talk between
the channels (signal is leaking both ways between channels), the
effect is to narrow the channel separation and a consequent
reduction of stereo effect.
This can be overcome to some extent by passing some small signal
level between the channels, but inverted, so it's cancelling
out the cross-talk. If you then increase this negative signal
which is passed between the channels so it's more than cancelling
the crosstalk, you are then crudely widening the stereo effect.
In circuit design, this is most easily done where there's an
amplifier stage involving an operational amplifier with negative
feedback to limit the gain and reduce noise. Link the left and
right operational amplifier negative inputs via a suitable
resistance, depending on the circuit impedances at that point
and the amount of signal you want to bleed between the channels.
It is interesting to experiment with different levels of signal
bleeding across between channels negatively and listening to the
effect on the stereo sound - it's quite stunning.
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