Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1991-03-08
1993-11-02
Kuntz, Curtis
Pulse or digital communications
Spread spectrum
Direct sequence
375120, 375118, 3701051, H04L 700
Patent
active
052590046
ABSTRACT:
A frame synchronization dependent type bit synchronization extraction circuit in an ISDN terminal equipment connected to a reference point S/T of an ISDN basic user network interface, for establishing bit synchronization between an internally produced signal and received data. To make the timing extraction jitter small and make the bit timing stable, it comprises a counter preset mode synchronization unit, a digital phase-lock loop mode synchronization unit, frame synchronization detection unit, and an inhibiting unit for inhibiting the operation of the counter preset mode synchronization unit, and the bit synchronization is effected by only the digital phase locked loop mode synchronization unit after the frame synchronization is detected by the frame synchronization detection unit.
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patent: 4795985 (1989-01-01), Gailbreath, Jr.
patent: 4933959 (1990-06-01), Knechtel
M. Fukuda et al., An Echo Canceller LSI for ISDN Subscriber Loop Transmission, Jun. 7-10, 1987, pp. 596-600, Seattle, US.
Fujitsu Limited
Ghebretinsae T.
Kuntz Curtis
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