Continuous transducer drift compensator

Claim 1

A circuit for reducing the d.c. outputted drift signal component from a transducer generated signal wherein the transducer signal includes the d.c. drift component to be reduced, a data component, and a high frequency noise component, said circuit comprising: first and second parallel integrator circuit means which receive and are responsive to said transducer signal; said first integrator circuit means having a first time constant set to pass the d.c. drift and data components of the received transducer signal while attenuating its received noise component; said second integrator circuit means having a second time constant set to be longer than the first time constant, said second integrator circuit means passes the said received d.c. drift and a smaller portion of the data component than that passed by the first integrator circuit means, said two integrator circuit means generating, respectively, first and second output signals; and circuit means for receiving said first and second output signals from the integrators and for subtracting said second output signal from said first output signal, the output signal from said subtracting means being a data component signal whose drift and noise component are continuously and automatically suppressed therein.