Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1992-03-16
1993-04-13
Chin, Stephen
Pulse or digital communications
Spread spectrum
Direct sequence
370102, 370108, H04L 700
Patent
active
052029042
ABSTRACT:
A pulse stuffing multiplexer apparatus is used in order to carry out multiplexing of these signals. The low order data signal for a single channel is stored into an m-bit memory in accordance with a clock signal obtained by demultiplying the low order clock signal of that channel to l/m to be read out as the high order data signal by a clock signal obtained by demultiplying a common high order clock signal not lower than all the low order clock signals to l/m. When the high order data signal is read out from this memory, an S-th (S.ltoreq.m) of both clock signals is monitored and, when the phase difference therebetween falls within predetermined k-bits (k.ltoreq.m), both demultipliers are reset at the head position of the next frame for both clock signals to be initialized at a predetermined position. In addition, the numbers of the low order clock and the high order clock are counted for each frame and, when the difference therebetween exceeds one bit, the high order clock signal is suppressed at the trailing end of the frame. If the above processing is made to all the channels, then each channel may be inserted at the corresponding position with an appropriate number of stuffing bits for synchronization so that it becomes possible to readily achieve a multiplexed signal by utilizing a multiplexer.
REFERENCES:
patent: 4764942 (1988-08-01), Shigaki
patent: 4928275 (1990-05-01), Moore et al.
patent: 4965794 (1990-10-01), Smith
patent: 5077761 (1991-12-01), Tokunaga
Chin Stephen
NEC Corporation
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