Active noise cancellation for bone conduction speaker of a head-mounted wearable device
US10699691B1 · kind B1 · utility
13Cited by
8References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 29, 2017 |
| Grant date | Jun 30, 2020 |
| Priority date | — |
| Expiry date | Jun 29, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2460/13
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A head-mounted wearable device (HMWD) may incorporate bone conduction speakers (BCS) to generate audio output that is perceptible to a wearer. During operation, vibrations of the BCS may produce sound in the surrounding air that is perceptible to bystanders. An active noise cancellation module monitors the output and generates cancellation audio that is out of phase with the sound leaked by the BCS. An air conduction speaker emits the cancellation audio, producing destructive acoustic interference to the leaked sound. As a result, the user of the HMWD is able to hear audio clearly while bystanders are not.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.