Signal source

Abstract

Abstract 1. AN ELECTRICAL AMPLIFIER COMPRISING; A. COMPARATOR APPARATUS (1 TO 24) HAVING FEEDBACK TO FORM A PULSE-WIDTH MODULATED SIGNAL (19'') FROM AN AMPLITUDE-VARYING INPUT SIGNAL (1'') AND A TRIANGULAR WAVE AMPLITUDE-VARYING SIGNAL (8''), B. FIRST AND SECOND SERIES OF GATING MEANS (39A & C; 39B & D) CONNECTED TO SAID COMPARATOR MEANS, EACH SAID SERIES SUPPLIED WITH A SQUARE WAVE SIGNAL (23'' OR 30'') TIME RELATED TO SAID TRANGULAR WAVE SIGNAL TO ALTERNATELY PASS SAID PULSE-WIDTH MODULATED SIGNAL IN SUCCESSIVE HALVES OF THE DURATION OF EACH PULSE WIDTH, C. A FIRST TYPE TRANSFORMER (42, 56) HAVING A PRIMARY AND PLURAL SECONDARIES (43 & 48), SAID PRIMARY CONNECTED TO ONE OF SAID FIRST SERIES OF SAID GATING MEANS (39A), D. A SECOND TYPE TRANSFORMER (53, 57) HAVING A PRIMARY AND ONE SECONDARY (AS 54), THE PRIMARY OF SAID SECOND TYPE TRANSFORMER CONNECTED TO ONE OF SAID SECOND SERIES OF SAID GATING MEANS (39B), E. A PLURALITY OF LOW-PASS FILTERS (45, 46, 47, 60, 61, 62) EQUAL IN NUMBER TO THE NUMBER OF SAID GATING MEANS IN SAID FIRST SERIES, EACH SAID FILTER CONNECTED TO SECONDARIES OF BOTH A FIRST AND A SECOND TYPE TRANSFORMER, F. A POWER AMPLIFIER HAVING AT LEAST TWO ACTIVE ELEMENTS 67 &68) IN OPPOSED GROUPS, AND AN OUTPUT, G. A CONNECTION (64) FROM ONE OF SAID PLURALITY OF LOWPASS FILTERS TO ONE (67) OF SAID ACTIVE ELEMENTS, H. A CONNECTION (66) FROM ANOTHER OF SAID PLURALITY OF LOW-PASS FILTERS TO SAID ACTIVE ELEMENT (68) THAT IS IN THE GROUP OPPOSED TO SAID ONE ACTIVE ELEMENT, I. A LOAD (72), AND J. A CONNECTION FROM THE OUTPUT OF SAID POWER AMPLIFIER TO SAID LOAD.

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