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Abstract

Method and apparatus for reducing the distortion imposed upon a combined information wave by a receiver filter or other signal processor. The method includes a step of adjusting the amplitude of the positive and negative segments of the combined information wave such that the positive and negative segments have pre-selected and equal amplitudes. The apparatus includes an adder circuit for combining the component information waves and the reference wave to form the combined information wave, a wave shaper to produce an equalized wave, and a wave multiplier for proportionally adjusting, on a half cycle basis, the amplitudes of the equalized positive and negative segments. The method further includes a step of pre-distorting the combined information wave to compensate for the distortion effect of a receiver filter or other signal processor. The apparatus for pre-distorting the combined information wave comprises a filter or other signal processor which is the same as the receiver filter or signal processor and a wave subtractor for biasing the combined information wave or comprises one or more circuits for mathematically predicting a distortion response to the filter or other signal processor and a wave subtractor for adding the inverse of the distortion response to the wave as it is transmitted.

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First Claim