Quaternary signal regenerator

Abstract From the Canadian patent

Abstract A digital signal regenerator receives a four-level input signal amplifies, reshapes, and retimes that signal into a regenerated four-level output signal. Awide range controlled equalizer amplifies and reshapes the four-level input signal into an intermediate signal. A variable all-pass circuit varies the shape of theequalizer's phase characteristic to optimally shape the four-level signal as a function of the maximum amplitude of the four-level input signal. The reshaped four-level signal is retimed and amplified into the regenerated fourlevel output signal. This enables multiplying the rate at which information is transmitted for a selected pulse rate in the transmission line.