CENTRAL_IMAGE_CANCELLER

Published:2009/7/8 4:05:00 Author:May | From:SeekIC

The circuit allows you to eliminate the vocal potion of an audio signal, while leaving the instrumental portion. The circuit mixes two channels that must be 180° out of phase, so the signals that form the center-stereo image is canceled out. Those signals usually appear in phase. Resistor R3 biases the noninverting input of UI from a center tap formed by resistors RI and R4, and capacitor C3. Resistor R4, capacitor C3, and potentiometer R6 form a negative-feedback circuit that establishes the closed-loop voltage gain of UI at unity. The signal is inverted between the input and output.



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