System for demodulating an angular modulated wave in which a carrier wave of low frequency is modulated

Claim 1

A system for demodulating an angularly modulated wave in which a carrier wave of relatively low frequency is modulated, comprising: waveshaping and phase-splitting means responsive to said modulated carrier wave for waveshaping and phase-splitting an angularly modulated wave, means responsive to said waveshaped and phase-split wave for producing two output square waves having mutually opposing phases; means for causing one of the output waveforms of said waveshaping and phase-splitting means to be delayed in phase by a specific angle and for producing a plurality of output square waves having equal phase delay angles with respect to the two output square waves of said waveshaping and phase-splitting means; means for differentiatiNg each of said output square waves and for producing responsive thereto corresponding pulse trains having a frequency which is substantially multiplied relative to that of said angularly modulated wave; and means for pulse-count demodulating said pulse train signal.

Claim 2

A system for demodulating an angularly modulated wave in which a carrier wave of relatively low frequency is modulated, comprising: waveshaping and phase-splitting means responsive to said modulated carrier wave for waveshaping and phase-splitting an angularly modulated wave, means responsive to said waveshaped and phase-split wave for producing two output square waves having mutually opposing phases; means for causing one of the output waveforms of said waveshaping and phase-splitting means to be delayed in phase by a specific angle and for producing a plurality of output square waves having equal phase delay angles with respect to the two output square waves of said waveshaping and phase-splitting means; means for differentiatiNg each of said output square waves and for producing responsive thereto corresponding pulse trains having a frequency which is substantially multiplied relative to that of said angularly modulated wave; and means for pulse-count demodulating said pulse train signal.

Claim 3

A system for demodulating an angularly modulated wave in which a carrier wave of relatively low frequency is modulated, comprising: first waveshaping and phase-splitting means operated responsive to said modulated carrier wave for waveshaping and phase-splitting an angularly modulated wave, means responsive to said last mentioned means for producing two output square waves having mutually opposing phases; first and second differentiation means for respectively differentiating the output square waves having mutually opposing phases produced by said first waveshaping and phase-splitting means; delay means for causing one of the output square waves of said first waveshaping and phase-splitting means to be delayed in phase by 90*; second waveshaping and phase-splitting means for waveshaping and phase-splitting the resulting signal thus delayed in phase by 90* by said delay means and producing two output square waves having mutually opposing phases; third and fourth differentiation means for respectively differentiating the output square waves having mutually opposing phases of said second waveshaping and phase-splitting means; first, second, third, and fourth gate means corresponding respectively to said first, second, third, and fourth differentiation means, and means comprising said gate means for passing and mixing differentiated pulses from said differentiation means to produce a differentiated pulse train of a frequency which is substantially quadruple the frequency of said angularly modulated wave; and demodulation means supplied with said differentiated pulse train and carrying out pulse-count demodulation.

Claim 4

A system for demodulating an angularly modulated wave in which a carrier wave of relatively low frequency is modulated, comprising: first waveshaping and phase-splitting means operated responsive to said modulated carrier wave for waveshaping and phase-splitting an angularly modulated wave, means responsive to said last mentioned means for producing two output square waves having mutually opposing phases; first and second differentiation means for respectively differentiating the output square waves having mutually opposing phases produced by said first waveshaping and phase-splitting means; delay means for causing one of the output square waves of said first waveshaping and phase-splitting means to be delayed in phase by 90*; second waveshaping and phase-splitting means for waveshaping and phase-splitting the resulting signal thus delayed in phase by 90* by said delay means and producing two output square waves having mutually opposing phases; third and fourth differentiation means for respectively differentiating the output square waves having mutually opposing phases of said second waveshaping and phase-splitting means; first, second, third, and fourth gate means corresponding respectively to said first, second, third, and fourth differentiation means, and means comprising said gate means for passing and mixing differentiated pulses from said differentiation means to produce a differentiated pulse train of a frequency which is substantially quadruple the frequency of said angularly modulated wave; and demodulation means supplied with said differentiated pulse train and carrying out pulse-count demodulation.

Claim 5

A system for demodulating an angularly modulated wave comprising: first waveshaping and phase-splitting means for producing two output square waves of mutually opposite phase responsive to a waveshaping of an angularly modulated wave in which a carrier wave of relatively low frequency is angularly modulated with a modulating signal; first differentiation means for differentiating one of the two output square waves and producing a first pulse train responsive thereto; second differentiation means for differentiating the other of the two output square waves and producing a second pulse train responsive thereto; delay means for delaying the phase of one of the two output square waves by 90*; second waveshaping and phase-splitting means for waveshaping the output wave of said delay means and producing two output square waves of mutually opposite phase reponsive thereto; third differentiation means for differentiating one of the two output square waves of said second waveshaping and phase-splitting means and producing a third pulse train responsive thereto; fourth differentiation means for differentiating the other of the two output square waves of said second waveshaping and phase-splitting means and producing a fourth pulse train responsive thereto; first, second, third and fourth gate means corresponding to the first, second, third and fourth differentiation means respectively for gating the pulse train of the corresponding differentiation means; pulse-count detector means responsive to the output waves of said first, second, third and fourth gate means for detecting said modulating signal; and means responsive to said detector means for producing a resultant pulse train of the output waves of said first, second, third and fourth gate means having a frequency which is substantially quadruple the frequency of the angular modulated wave.

Claim 6

A system for demodulating an angularly modulated wave comprising: first waveshaping and phase-splitting means for producing two output square waves of mutually opposite phase responsive to a waveshaping of an angularly modulated wave in which a carrier wave of relatively low frequency is angularly modulated with a modulating signal; first differentiation means for differentiating one of the two output square waves and producing a first pulse train responsive thereto; second differentiation means for differentiating the other of the two output square waves and producing a second pulse train responsive thereto; delay means for delaying the phase of one of the two output square waves by 90*; second waveshaping and phase-splitting means for waveshaping the output wave of said delay means and producing two output square waves of mutually opposite phase reponsive thereto; third differentiation means for differentiating one of the two output square waves of said second waveshaping and phase-splitting means and producing a third pulse train responsive thereto; fourth differentiation means for differentiating the other of the two output square waves of said second waveshaping and phase-splitting means and producing a fourth pulse train responsive thereto; first, second, third and fourth gate means corresponding to the first, second, third and fourth differentiation means respectively for gating the pulse train of the corresponding differentiation means; pulse-count detector means responsive to the output waves of said first, second, third and fourth gate means for detecting said modulating signal; and means responsive to said detector means for producing a resultant pulse train of the output waves of said first, second, third and fourth gate means having a frequency which is substantially quadruple the frequency of the angular modulated wave.