Utilizing carrier construction

Claim 1

A frequency discriminator adapted to have an input signal applied thereto, said discriminator comprising: a source of timing signals representative of periods of time; a source of a reference signal and the quadrature thereof; multiplying means connected to receive the input signal, and the reference and quadrature signals and the timing signals for providing four output signals, an input/reference signal, an input/quadrature signal, an input/reference/timing signal and an input/quadrature/timing signal; integration means connected to said multiplying means for receiving the four output signals therefrom and providing four output signals representative of the integral of each of the four output signals; first multiplying means connected to said integration means for receiving two of the output signals therefrom representative of the integral of the input/reference signal and the integral of the input/quadrature/timing signal and providing an output signal representative of the product thereof; second multiplying means connected to said integration means for receiving the remaining two of the output signals therefrom, representative of the integral of the input/quadrature signal and the input/reference/timing signal, and providing an output signal representative of the product thereof; and combining means connected to said first and second multiplying means for receiving the output signals therefrom and providing an output signal representative of the output signal of said second multiplying means subtracted from the output signal of said first multiplying means.