Wescom, Inc.

Steven W Landauer

Harry J Dyke

A framing circuit for a pulse code modulated, time multiplexed data receiver provides terminal framing by first detecting a predetermined terminal frame bit code and then checking for false framing by utilizing a false framing detector to count the number of times a particular pattern in a signaling frame bit code occurs. The false framing detector is enabled after terminal framing of the receiver has been accomplished. The false framing detector thereby provides a cross-check between the terminal frame code and the signaling frame code to assure that the receiver has not erroneously framed on a 2 khz interference tone. The cross-check occurs during data reception after terminal framing so that the false frame detector does not delay reframing under ordinary circumstances.

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Des Plaines, IL, United States of America

Steven W Landauer