Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1978-09-25
1980-07-22
Safourek, Benedict V.
Pulse or digital communications
Spread spectrum
Direct sequence
371 47, H04L 700
Patent
active
042141249
ABSTRACT:
Method and device for extracting a synchronizing signal from a digital signal. The synchronizing signal can be a single bit, a word or a subframe. A first circuit searches for the synchronizing signal in a fixed position in the received signal every time it should occur. If this circuit does not find the synchronizing signal when it should, a second circuit starts a search action for it in the received signal. When the first circuit has not found the synchronizing signal a fixed number of times, the loss of synchronism will be signalled to the equipment that follows. If in the mean time the second circuit has found the synchronizing signal a fixed number of times in the same position in the received signal, then the first circuit will be synchronized with the second circuit. This synchronism only occurs if the second circuit has found the synchronizing signal a greater number of consecutive times than the first circuit within the same period of time.
REFERENCES:
patent: 4002845 (1977-01-01), Kaul et al.
patent: 4035601 (1977-07-01), Isaacs
patent: 4119796 (1978-10-01), Jones
De Staat der Nederlanden, te Dezen Vertegenwoordigd Door de
Kirk Hugh Adam
Safourek Benedict V.
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