Local tone generation
US11233582B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 25, 2016 |
| Grant date | Jan 25, 2022 |
| Priority date | — |
| Expiry date | Oct 7, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2499/11
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A mobile device that generates and transmits a human-inaudible acoustic signal, which encodes a symbol sequence representing a binary message, for delivery as audio content, is disclosed. The mobile device encodes the binary message into a sequence of symbols that are each associated with frequency characteristics and generates and transmits the human-inaudible acoustic signal, based on the frequency characteristics of the symbols. A further mobile device that receives and decodes a human-inaudible acoustic signal, which encodes a symbol sequence representing a binary message, embedded within audio content, is disclosed. The mobile device repeatedly performs a frequency domain transformation of samples of the signal to generate a symbol sequence, and performs error correction decoding upon the symbol sequence to determine the validity of the symbol sequence. The mobile device then transmits the symbol sequence as the decoded equivalent of the human-inaudible acoustic signal, once a valid symbol sequence has been identified.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.