Error correction for infrared data communication
US5124991A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 30, 1989 |
| Grant date | Jun 23, 1992 |
| Priority date | — |
| Expiry date | Mar 30, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L1/1874
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
The present invention is for a method for correcting errors in received data during transmission of infrared radiation from a transmitter to a receiver without retransmitting entire packets. The method includes the steps of detecting an error in received data. A negative acknowledgement signal is transmitted from the receiver to the transmitter. A predetermined acknowledgement is transmitted by the transmitter to indicate to the receiver that the negative acknowledgement signal has been received. The data is then retransmitted. The data is transmitted using pulse position modulation. An error is detected by either sensing two pulses within one cycle or sensing no pulses within one cycle. The negative acknowledgement signal comprises transmitting a pulse several positions in duration. The predetermined acknowledgement by the transmitter includes purposely transmitting a cycle containing a known error.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.