Self-adjusting attenuation equalizer

Claim 1

AN ELECTRICAL ATTENUATION EQUALIZER COMPRISING A PLURALITY OF SIGNAL TRANSMISSION CHANNELS EACH HAVING A SIGNAL INPUT TERMINAL AND A SIGNAL OUTPUT TERMINAL, EACH SAID CHANNEL INCLUDING A BAND-PASS FILTER ELEMENT WHOSE BAND PASS HAS A DIFFERENT PEAK FREQUENCY AND FOLLOWED BY A GAIN-CONTROL ELEMENT ADAPTED TO VARY THE GAIN OF SAID CHANNEL IN RESPONSE TO A CONTROL VOLTAGE APPLIED AT A CONTROL TERMINAL THEREOF, A PLURALITY OF CONTROL-VOLTAGE GENERATING CIRCUITS ADAPTED TO GENERATE A CONTROL VOLTAGE AT AN OUTPUT TERMINAL THEREOF IN RESPONSE TO A SIGNAL APPLIED AT AN INPUT TERMINAL THEREOF, MEANS CONNECTING THE INPUT TERMINALS OF SAID CONTROLVOLTAGE GENERATING CIRCUITS TO A POINT IN SAID RESPECTIVE CHANNELS SUBSEQUENT TO THE FILTER ELEMENT THEREOF, MEANS CONNECTING THE OUTPUT TERMINAL OF EACH SAID CONTROL-VOLTAGE GENERATING CIRCUIT TO THE CONTROL TERMINALS OF A PLURALITY OF SAID GAIN-CONTROL CIRCUITS INCLUDING THE GAIN-CONTROL CIRCUIT OF THE CHANNEL TO WHICH THE INPUT TERMINAL OF SAID CONTROL-VOLTAGE GENERATING CIRCUIT IS CONNECTED, A SIGNAL SUMMING CIRCUIT HAVING A PLURALITY OF INPUT CONNECTIONS WHOSE INSTANTANEOUS SIGNALS ARE ADDED AND DELIVERED AT AN OUTPUT TERMINAL, MEANS CONNECTING THE OUTPUT TERMINALS OF SAID SIGNAL TRANSMISSION CHANNELS TO THE RESPECTIVE INPUT CONNECTIONS OF SAID SIGNAL SUMMING CIRCUIT, AND MEANS CONNECTING THE INPUT TERMINALS OF SAID SIGNAL TRANSMISSION CHANNELS TO A COMMON TERMINAL TO WHICH THE SIGNAL TO BE EQUALIZED IS APPLIED, WHEREBY THE SIGNAL DELIVERED AT THE OUTPUT TERMINAL OF SAID SIGNAL SUMMING CIRCUIT IS COMPENSATED FOR SMOOTH PRIOR FILTERING BUT IS UNCOMPENSATED FOR PRIOR SHARP NARROW-BAND FILTERING.