Object detection circuitry
AssigneeCirrus Logic International Semiconductor Ltd.
InventorsJohn P. LESSO, Claire MOTION
Life of this patent
Estimating the term…
Abstract
Circuitry comprising excitation circuitry for supplying a transducer with an excitation signal to generate a detection signal and current monitor circuitry for monitoring current through the transducer.
Claims25
-52. (canceled)
Circuitry for detecting the presence of an object based on an object detection signal output by a transducer, the circuitry comprising:
- voltage monitor circuitry configured to generate a monitored transducer voltage signal indicative of a voltage across the transducer;
- current monitor circuitry configured to generate a monitored transducer current signal indicative of a current through the transducer;
- and
- processing circuitry configured to receive the monitored transducer voltage signal and the monitored transducer current signal,
- wherein the processing circuitry is configured to output a signal indicative of a distance between the transducer and a detected object based on the monitored transducer current signal in a first phase of operation of the circuitry,
- and wherein the processing circuitry is configured to output a signal indicative of a distance between the transducer and a detected object based on the monitored transducer voltage signal in a second phase of operation of the circuitry.
A method for detecting the presence of an object based on an object detection signal output by a transducer, the method comprising:
- generating a monitored transducer voltage signal indicative of a voltage across the transducer;
- generating a monitored transducer current signal indicative of a current through the transducer;
- and
- during a first phase of operation, processing the monitored transducer voltage signal and the monitored transducer current signal to generate a signal indicative of a distance between the transducer and a detected object based on the monitored transducer current signal,
- during a second phase of operation, generating a signal indicative of a distance between the transducer and a detected object based on the monitored transducer voltage signal.
A method for detecting the presence of an object in a signal path of a signal transmitted by a transducer, the method comprising:
- detecting a transducer signal;
- and
- processing the transducer signal and a reference signal to determine a statistical metric based on the transducer signal and the reference signal, the statistical metric indicative of the presence of an object in the signal path.
Dependencies are inferred from the claim text.