Wearable alert device having selectable alert volume and method of operating same
US9542816B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 15, 2014 |
| Grant date | Jan 10, 2017 |
| Priority date | — |
| Expiry date | Jul 17, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2499/11
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A wearable alert device includes an audio transducer and driver circuit that allows selection of either a high or low volume setting for driving the transducer. The driver circuit is operable in a single ended mode for low volume and a double ended mode for high volume. The single ended mode holds one terminal of the transducer low while the other is driven in correspondence with a clock signal, while the double ended mode drives one terminal in correspondence with the clock signal and the other terminal is inverted from the clock signal. The transducer is activated in response to an alert event, and can be driven according to a profile or pattern.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.