Suppressor type of echo control has adapted

TELEPHONE SYSTEM. LOOP CONTROL IS INTENDED TO APPLY THE AUDIBLE SIGNAL FROM THE RECEPTION CIRCUIT TO GAUGE 17 THROUGH LOSS OF CIRCUIT OF THE VARIABLE 8 COMPARE WITH FOR LEVEL AUDIBLE SIGNAL CIRCUIT TRANSMISSION TO ENSURE APPROPRIATE CONTROL CIRCUIT VARIABLE LOST THROUGH THE GAUGE OF OUTPUT SIGNAL AND REDUCE THE OUTPUT SIGNAL THE DIAL TO ZERO. SUPPRESSION ECHO IN A TELEPHONE LINE.