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US 5,124,991 AGranted
Error correction for infrared data communication
AssigneeSA Photonics, Inc.
InventorRichard C. Allen
Life of this patent
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AssigneeSA Photonics, Inc.
InventorRichard C. Allen
Estimating the term…
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.
A method of correcting errors in received data during transmission of a stream of data transmitted in series of cycles wherein a predetermined number of bits are transmitted during a cycle from a transmitter to a receiver and further wherein the receiver does not acknowledge receiving error free data to the transmitter, the method comprising the steps of:
A method of the type for correcting errors in received data during transmission from a transmitter to a receiver wherein the data is transmitted in a packet of bytes and further whereby the receiver need not transmit an acknowledge signal with each correctly received byte or packet, the method comprising the steps of:
Dependencies are inferred from the claim text.