Patent ID: 7620181

Claim:
A synchronized communications system that permits resynchronization in late-entry or fade-recovery conditions, which comprises: a plurality of communications devices which are operative for communicating in a synchronized encrypted communications channel between each other, wherein at least one of said communications devices continuously transmits a resynchronization header comprising, a start-of-message field that includes voice or data message infotype, a message indicator field, a synchronization check field, a first error correction field computed over the start-of-message/message indicator/synchronization fields, a frame index field, and a second error correction field computed on the frame index field and wherein at least one communications device stores data of prior transmitted message indicator fields and synchronization check fields and determines late-entry and fade-recovery conditions using recently received and stored message indicator fields and synchronization check fields, and determines a late-entry condition when a received message indicator field and synchronization check field are different from the prior stored message indicator field and synchronization check field and determines a fade-recovery condition when a received message indicator field and synchronization check field are the same as the prior stored message indicator field and synchronization check field.