Measuring circuit for registering and processing signals and measuring device for using said measuring circuit

A measuring circuit for registering and processing signals received from a transducer having a plurality of transducer elements, the measuring circuit comprising:

• at least a first signal input, a second signal input and a third signal input, the first signal input configured to receive a first signal from a first transducer element of the plurality of transducer elements, the second signal input configured to receive a first signal from a second transducer element of the plurality of transducer elements, the third signal input configured to receive a second signal sum indicative of a sum of a second signal from each of the plurality of transducer elements, each of the second signals being an inverse of a corresponding first signal;
• and
• a processor electrically coupled to the first signal input, the second signal input and the third signal input, the processor configured to:
• register each of the first signals individually;
• register the second sum signal;
• and
• generate at least one differential signal based, at least in part, on one of the first signals and one of the second signals.

A measuring device comprising:

• a transducer comprising a plurality of transducer elements, each of the transducer elements comprising a first contact and a second contact, the first contact configured to output a first signal, the second contact configured to output a second signal, the second signal being an inverse of the first signal;
• an adder, the adder configured to add the second signals together to obtain a second signal sum;
• and
• a measuring circuit electrically coupled to the transducer via a cable, the measuring circuit comprising:
• at least a first signal input, a second signal input and a third signal input, the first signal input configured to receive the first signal from a first transducer element of the plurality of transducer elements, the second signal input configured to receive the first signal from a second transducer element of the plurality of transducer elements, the third signal input configured to receive the second signal sum;
• and
• a processor electrically coupled to the first signal input, the second signal input and the third signal input, the processor configured to:
• register each of the first signals individually;
• register the second sum signal;
• generate at least one differential signal based, at least in part, on one of the first signals and one of the second signals;
• add the first signals together to obtain a first signal sum;
• add the first signal sum and the second signal sum to obtain an interference signal.

A method for detecting at least two measured variable in an interference-free manner, the method comprising:

• obtaining, by a measuring circuit, a first signal output by each of a plurality of transducer elements of a transducer electrically coupled to the measuring circuit;
• obtaining, by the measuring circuit, a second signal sum from the transducer, the second signal sum indicative of a sum of a second signal output by each of the plurality of transducer elements, the second signal being an inverse of the first signal;
• adding, by the measuring circuit, each of the first signals together to obtain a first signal sum;
• determining, by the measuring circuit, an interference signal based, at least in part, on the first signal sum and the second signal sum, the interference signal indicative of an external electromagnetic interference of the first signals and the second signals or the second signal sum.