Keyed filter employing a crystal as integrating element

Claim 1

AN ELECTRONIC WAVE-SHAPING CIRCUIT COMPRISING: CRYSTAL RESONATOR MEANS HAVING A RESONANT FREQUENCY FO AND CONSISTING OF: (A) CRYSTAL MEANS; (B) INPUT CIRCUIT MEANS AND OUTPUT TERMINAL MEANS; (C) SAID INPUT CIRCUIT OF SAID CRYSTAL RESONATOR MEANS COMPRISING A TRANSFORMER HAVING A PRIMARY WINDING AND A SECONDARY WINDING WITH A CENTER TAP CONNECTED TO A REFERENCE POTENTIAL, (D) SAID CRYSTAL MEANS BEING CONNECTED BETWEEN A FIRST END TERMINAL OF SAID SECONDARY WINDING AND THE OUTPUT TERMINAL MEANS OF SAID CRYSTAL RESONATOR MEANS, (E) AND CAPACITOR MEANS OF THE ORDER OF MAGNITUDE OF THE INHERENT SHUNT CAPACITANCE OF SAID CRYSTAL MEANS BEING CONNECTED BETWEEN THE OTHER END TERMINAL OF SAID SECONDARY WINDING AND THE OUTPUT TERMINAL MEANS OF SAID CRYSTAL RESONATOR MEANS, MEANS FOR SUPPLYING TO SAID INPUT CIRCUIT MEANS AN INPUT SIGNAL INCLUDING A TONE HAVING A FREQUENCY F**0. SAID INPUT SIGNAL BEING COMPRISED OF A SUCCESSION OF TIME SYNCHRONOUS DATA BITS OF INFORMATION WITH THE NATURE OF EACH BIT OF INFORMATION BEING DETERMINED BY THE PHASE THEREOF WITH RESPECT TO A REFERENCE PHASE, MEANS FOR SUPPLYING SAID REFERENCE PHASE; FEEDBACK CIRCUIT MEANS RESPONSIVE TO THE SIGNAL APPEARING AT THE OUTPUT TERMINAL MEANS OF SAID CRYSTAL RESONATOR MEANS TO SUPPLY TO SAID INPUT CIRCUIT MEANS OF SAID CRYSTAL RESONATOR MEANS A SIGNAL 180* OUT OF PHASE WITH THE SAID INPUT SIGNAL; SWITCHING MEANS CONSTRUCTED TO OPERATE IN PREDETERMINED TIME RELATIONSHIP WITH SAID BITS OF SAID INPUT SIGNAL AND TO SUCCESSIVELY CONNECT SAID INPUT SIGNAL TO THE INPUT CIRCUIT MEANS OF SAID RESONATOR, DISCONNECT SAID INPUT SIGNAL FROM SAID INPUT CIRCUIT MEANS AFTER A GIVEN INTERVAL OF TIME, AND AFTER ANOTHER PREDETERMINED INTERVAL OF TIME COMPLETE SAID FEEDBACK CIRCUIT TO THE INPUT CIRCUIT MEANS OF SAID CRYSTAL RESONATOR MEANS TO SQUELCH THE RESONANT CONDITION THEREIN, AND MEANS FOR TIMING SAID SWITCHING MEANS TO PROVIDE TIME CORRELATION BETWEEN THE RECEIVED INFORMATION DATA BITS AND THE OPERATION OF SAID SWITCHING MEANS.