Vocal Eliminator

Otherwise properly mixed sounds often suffer from a predom- inant solo voice (which may, of course, be the intention). If such a voice needs to be suppressed, the present circuit will do the job admirably. The circuit is based on the fact that solo voices are invariably struated "at the centre" of the stereo recordings that are to be mixed. This means that the voice levels in the left- and right-hand channels are about equal. Arithmetically, therefore, left minus right is zero, that is, a mono signal without voice. There is, however, a problem: the sound levels of bass instru- ments, more particularly the double basses, are also just about the same in the two channels. This is becausae on the one hand low- frequency sounds are virtually non-directional and on the other hand, the recording engineers purposely use these frequencies to ELEKTOR ELECTRONICS JULY 1989 SUPPLEMENT give a balance between the two channels. However, the bass instruments may be recovered by adding those appea...