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US 12,684,289 B2Granted
Reducing or eliminating transducer reverberation
AssigneeSemiconductor Components Industries, LLC
InventorsMarek Hustava, Tomas Suchy, Michal Navratil, Jiri Kutej
Life of this patent
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Abstract
An obstacle monitoring system includes a transducer that receives an ultrasonic echo from an obstacle and generates a signal based on the echo. The system further includes a controller coupled to the transducer that is calibrated based on a frequency response of the transducer and a coupling circuit. The system further includes circuitry generating a damping current, controlled by the controller, that reduces or eliminates reverberation of the transducer.
Claims21
An obstacle monitoring system comprising:
- a transducer configured to transmit an ultrasonic pulse, configured to receive ar ultrasonic echo from an obstacle, and configured to generate a signal based on the echo the ultrasonic pulse causing post-transmission reverberation of the transducer;
- an analog-to-digital converter (ADC) configured to digitize the signal from the transducer;
- a digital damping filter calibrated based on a response of the transducer, the digital damping filter configured to convert the digitized signal from the transducer into a digital damping signal;
- and
- a digital-to-analog converter (DAC) configured to convert the digital damping signal into a damping current that reduces or eliminates the post-transmission reverberation of the transducer.
2 more elements
An obstacle monitoring method comprising:
- using an ultrasonic transducer to transmit an ultrasonic pulse and to obtain a receive signal, the receive signal including an ultrasonic echo from an obstacle, wherein the ultrasonic pulse causes post-transmission reverberation of the transducer;
- calibrating a digital damping filter by selecting filter coefficients based on a response of the ultrasonic transducer;
- using the digital damping filter to convert a portion of the receive signal into a digital damping signal;
- and
- converting the digital damping signal into a damping current that reduces or eliminates the post-transmission reverberation of the transducer.
2 more elements
A circuit comprising:
- an analog-to-digital converter (ADC) configured to couple to a transducer configured to receive ultrasonic echoes from an obstacle in response to ultrasonic pulses that cause post-transmission reverberation of the transducer, the ADC configured to convert a signal from the transducer into a digitized signal;
- a digital damping filter configured to convert the digitized signal into a digital damping signal;
- a controller configured to calibrate the digital damping filter based on a pulse response of the transducer;
- a digital-to-analog converter (DAC) configured to convert the digital damping signal into a damping current that reduces or eliminates the post-transmission reverberation of the transducer.
1 more element
Dependencies are inferred from the claim text.