Low frequency square wave to sine wave shaper

Claim 1

SIGNAL SHAPING MEANS COMPRISING A FIRST AMPLIFIER INCLUDING PHASE INVERTING MEANS, SAID FIRST AMPLIFIER COMPRISING FIRST AND SECOND STAGES, SAID FIRST STAGE COMPRISING A GROUNDED BASE TRANSISTOR AMPLIFIER AND SAID SECOND STAGE COMPRISING A GROUNDED COLLECTOR TRANSISTOR AMPLIFIER; A SOURCE OF SYMMETRICAL SQUARE WAVES CONNECTED TO THE INPUT OF SAID FIRST AMPLIFYING MEANS, A SIGNAL TRANSLATING MEANS RECEIVING THE OUTPUT FROM SAID FIRST AMPLIFYING MEANS AND BEING ADAPTED TO DEVELOP AN OUTPUT IN PHASE WITH THE INPUT THERETO, SAID SIGNAL TRANSLATING MEANS COMPRISING A GROUNDED EMITTER THIRD TRANSISTOR AMPLIFIER STAGE, SAID PHASE SHIFT NETWORK BEING CONNECTED BETWEEN THE EMITTERS OF SAID FIRST AND THIRD STAGES, SAID PHASE SHIFTING MEANS BEING ADAPTED TO PRESENT A PHASE SHIFT OF 180* TO FREQUENCIES EQUAL THAT OF THE FUNDAMENTAL HARMONIC OF SAID SQUARE-WAVE INPUT SIGNAL, SAID AMPLIFIER AND SIGNAL TRANSLATING MEANS AND PHASE SHIFT MEANS BEING ADJUSTED TO COLLECTIVELY EXHIBIT A GAIN OF LESS THAN UNITY AND BEING RESPONSIVE TO THE PRESENCE OF SAID SQUARE-WAVE INPUT SIGNAL TO DEVELOP A SINUSOIDAL OUTPUT SIGNAL FROM SAID SIGNAL TRANSLATING MEANS AT THE FUNDAMENTAL FREQUENCY OF SAID SQUARE-WAVES AND PHASE-LOCKED THEREWITH.