System and method of duplex wireless audio link over broadcast channels
US8422409B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 2010 |
| Grant date | Apr 16, 2013 |
| Priority date | — |
| Expiry date | Aug 13, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/034
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A device and method of duplex audio communication over a broadcast channel are disclosed. Low-power transmission over a broadcast channel is permissible for personal use as long as the transmitted power level is below a level allowed by respective regulatory. For example, low-power FM transmitter can be used to provide a wireless audio link between two audio devices. One such application scenario is a wireless speakerphone used as an audio extension from a cellphone for group conference purposes. Such applications face issues of potential interference from other users of the same channel and the need of manually selecting and tuning a pair of channels. The device and method disclosed in the present invention use the clear channel technique to automatically select an un-occupied channel for the transmit side and utilizes an identification embedded in a sub-channel to allow the receiver to automatically tune to the channel used by the transmitter. The clear channels may be determined by respective transceivers or determined by a master transceiver.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.