Circuit for acoustic distance measuring
US10345445B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 18, 2016 |
| Grant date | Jul 9, 2019 |
| Priority date | — |
| Expiry date | Aug 3, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/0042
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In one form, an acoustic signal is generated for an acoustic transducer, where the acoustic transducer is susceptible to reverberation that defines a close proximity indication zone. The start of a close proximity indication zone window is defined after the generation of the acoustic signal at a first time. During the close proximity indication zone window, a signal is received from the acoustic transducer. When the signal is received, an obstacle is detected in the close proximity indication zone if the magnitude of a first pulse received from the transducer at a second time is less than a first threshold but greater than a second threshold for a debounce time. Additionally, a magnitude of a second pulse received from the transducer outside the close proximity indication zone window at a third time should be less than the second threshold but greater than a third threshold for the debounce time. In this form, the third time is equal to the first time plus two times the difference between the second time and the first time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.