Digital integrating/auto-correlator apparatus

A digital integrating/auto-correlator apparatus comprising in combination:

• switching means for receiving a first and second signal,
• a filter means for receiving the output from said switching means, said filter means providing a filtered output signal,
• a sample and hold means connected to said filter means to receive said filtered output signal, said sample and hold means receiving a sample control signal, said sample and hold means providing a time invariant output signal,
• an A/D converter means connected to said sample and hold means to receive said output signal therefrom, said A/D converter means receiving a convert control signal, said A/D converter means providing a digital output signal, and,
• a digital integrating/auto-correlator means receiving said digital output signal from said A/D converter means, said digital integrating/auto-correlator means receiving an externally generated clock signal for synchronizing signal processing within itself, said digital integrating/auto correlator means generating a signal select control signal which is applied to said switching means to switch either of said first or second signal to the output of said switching means, said digital integrating/auto-correlator means also generating a sample control signal to establish the sampling period within said sample and hold means and a convert control signal to establish the A/D conversion period within said A/D converter means, said digital integrating/auto-correlator means digitally integrating and correlating said digital output signal to provide a digitally correlated output signal.