Automatic mean-square equalizer

Claim 1

IN COMBINATION WITH A NONIDEAL TRANSMISSION CHANNEL AND A TRANSVERSAL EQUALIZER HAVING A PLURALITY OF EQUALLY SPACED TAPS, AN ADJUSTABLE ATTENUATOR AT EACH TAP AND A SUMMING CIRCUIT COMMON TO THE OUTPUTS OF ALL ATTENUATORS, APPARATUS FOR OPTIMALLY ADJUSTING SAID EQUALIZER TO IMPART A DESIRED FREQUENCY RESPONSE TO A PASSBAND OF SAID CHANNEL COMPRISING MEANS AT EACH TERMINAL OF SAID CHANNEL GENERATING IDENTICAL QUASI-RANDOM DATA WORD PATTERNS AS TEST SIGNALS, MEANS AT EACH TERMINAL OF EACH CHANNEL TRANSLATING THE RESPECTIVE WORD PATTERNS FROM SAID GENERATING MEANS TO EQUIVALENT PASSBANDS OF SAID CHANNEL, MEANS AT THE TRANSMITTING TERMINAL INSERTING SIGNALING COMPONENTS BEARING A FIXED RELATION TO THE TRANSMITTER CARRIER FREQUENCY AND THE DATA TIMING, MEANS AT THE RECEIVING TERMINAL RESPONSIVE TO SAID SIGNALING COMPONENTS ACCOMPANYING THE TRANSMITTED SIGNAL AND CONTROLLING SAID TRANSLATING MEANS THEREAT FOR EXTRACTING A DEMODULATING CARRIER FREQUENCY COMPENSATED FOR FREQUENCY OFFSET INTRODUCED BY SAID CHANNEL WITH RESPECT TO THE TRANSMITTER CARRIER FREQUENCY, MEANS ALSO RESPONSIVE TO SAID SIGNALING COMPONENTS RECOVERING A TIMING WAVE FOR SAID WORD GENERATOR AT THE RECEIVER TERMINAL, REFERENCE FILTER MEANS AT THE RECEIVER TERMINAL SHAPING THE RECEIVER GENERATED WORD PATTERN ACCORDING TO THE DESIRED FREQUENCY RESPONSE,