Quasi-pulse stuffing synchronization

Details Quasi-pulse stuffing synchronization Quasi-pulse stuffing synchronization

1977-09-01

1978-06-13

Cooper, William C.

H04J 306

Patent

active

040950530

ABSTRACT:
In a digital communication system, synchronization of a plurality of asynchronous digital signals is usually achieved by stuffing one or more pulses in a pulse stream. Thereby, stuffing equalizes the input signal bit rate with the usually fixed bit rate of a signal on a transmission link. For example, in pulse stuffing, single pulses are added at certain allowed times to equalize the input bit rate with the transmission link bit rate. On the other hand, in block stuffing, a block of pulses is added. However, conventional block stuffing usually requires a narrowband phase-locked loop for removing jitter in the received signal. As a result, slower acquisition of synchronization occurs. To mitigate this and other problems in a block oriented system, an improved arrangement, called quasi-pulse stuffing synchronization, employs block stuffing at a transmitter and pulse destuffing at a receiver in combination with a control signal for identifying when a digital signal would have been pulse stuffed if the system were employing pulse stuffing. Thereby, jitter can be removed using a conventional widerband, pulse stuffing phase-locked loop.

REFERENCES:
patent: 3461245 (1969-08-01), Johannes
patent: 3830981 (1974-08-01), Gruber
IEEE Transactions on Communication Technology, vol. com-16, No. 2, Apr., 1968, pp. 252-254, Butman, S., "Synchronization of PCM Channels by the Method of Word Stuffing".

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