Detecting proximity of devices based on transmission of inaudible sound signatures in the speech band
US9591148B2 · kind B2 · utility
7Cited by
2References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 7, 2015 |
| Grant date | Mar 7, 2017 |
| Priority date | — |
| Expiry date | Apr 7, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S3/80
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A communication device detects sound with a microphone to produce a sound signal representative of the sound and searches the sound signal for unique inaudible sound signatures associated with a group identifier. Each sound signature identifies a respective communication device. Each sound signature is in an audible frequency band but masked to be imperceptible. If any of the sound signatures are determined to be present in the sound signal, the communication device selects one based on predetermined criteria associated with the group identifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.