Detection and synchronization of audio transmissions using complex audio signals
US11558647B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 4, 2021 |
| Grant date | Jan 17, 2023 |
| Priority date | — |
| Expiry date | Oct 4, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/43637
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Methods and systems for improved detection of audio transmissions are provided. In one embodiment, a method is provided that includes receiving an audio signal containing an audio transmission. The audio transmission may contain a predetermined portion that was initially generated based on an expected sequence of complex-valued signals. A real portion of the expected sequence of complex-valued signals may be compared to the received audio signal to identify a first portion of the received audio signal. A complex portion of the expected sequence may be compared to portions of the received audio signal near the first portion of the received audio signal to identify a second portion of the received audio signal. An arrival time of the audio transmission may be determined based on the second portion of the received audio signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.