EQUALIZER FOR LINEARIZING A TRANSMISSION CHANNEL PHASE-FREQUENCY RESPONSE UTILIZING ODD AND EVEN ORDER ALL-PASS NETWORKS

摘要

An equalizer for linearizing a non-linear phase-frequency characteristic and formed from successive all-pass filter stages in which at least first and second odd order filter stages align groups of frequencies along respective linear phase-frequency approximation through the introduction of appropriate symmetrical phase shifts. A third even order filter stage linearly superimposes the linear approximations by way of an antisymmetrical phase shift.