Infrared echo canceling
US5838471A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 27, 1996 |
| Grant date | Nov 17, 1998 |
| Priority date | — |
| Expiry date | Jun 27, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/11
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An infrared data communications system employs echo cancellation to remove echo signals of infrared transmissions received by an infrared receiver transducer. A version of the data pulse signal to be transmitted is subtractively combined with the received data pulse signal in order to remove echos of the transmitted signal from the received data pulse signal. A pulse stretcher circuit is utilized to increase the pulse width duration of the version of the data pulse signal to be combined with the received data pulse signal in order to ensure correct timing and cancellation of received echo signals over a range of echo signal propagation delay time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.