Smoothing filter

Details Smoothing filter Smoothing filter

H - Electricity

04

B

325/1

H04B 10/12 (2006.01) H04L 12/433 (2006.01)

Patent

CA 2022838

Abstract SMOOTHING FILTER Preamble smoothing for information character transmissions in a data transmission network is accomplished as follows. First, the smoothing filter identifies the start of a new preamble. If the start of a new preamble is identified and a previously received preamble has been extended, then the preamble is contracted by deleting an IDLE byte or, if the frame received prior to the initial IDLE byte was a frame fragment, then the information character preceding the initial IDLE byte is deleted. Following the contraction of the preamble, a determination is made as to whether next received byte is an IDLE byte. If it is not, then the preamble is extended by inserting an IDLE byte and the smoothing filter begins searching for the start of a new preamble. If it is, then a counter is incremented. If the counter has not yet reached its preset threshold, then the next byte is checked to determine whether it is an IDLE byte. If it is, then the counter is again incremented. This iterative process continues until the counter threshold is reached. At that point, the smoothing filter again begins searching for the start of a new preamble.

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