Method of operating electro-acoustic transducers, corresponding circuit and device
US11579273B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 6, 2022 |
| Grant date | Feb 14, 2023 |
| Priority date | — |
| Expiry date | Jan 6, 2042 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB06B2201/57
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of operating electro-acoustical transducers such as PMUTs involves applying to the transducer an excitation signal over an excitation interval, acquiring at the transducer a ring-down signal indicative of the ring-down behavior of the transducer after the end of the excitation interval, and calculating, as a function of said ring-down signal, a resonance frequency of the electro-acoustical transducer. A bias voltage of the electro-acoustical transducer can be controlled as a function of the resonance frequency. An acoustical signal received can be transduced into an electrical reception signal and a damping parameter of the electro-acoustical transducer can be calculated as a function of the ring-down signal so that a cross-correlation reference signal can be synthesized as a function of the resonance frequency and the damping ratio of the electro-acoustical transducer. Such a cross-correlation reference signal can be used for cross-correlation with the electrical reception signal to improve the reception quality.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.