Pulse or digital communications – Synchronizers
Patent
1997-04-23
1999-11-09
Chin, Stephen
Pulse or digital communications
Synchronizers
375222, 375371, 327162, 395551, H04L 700, H04B 138
Patent
active
059828269
ABSTRACT:
A synchronous clock regeneration system is implemented in a modem to enable the generation of a clock waveform at the same frequency as that of the transmitting device. The synchronous clock regeneration system receives an error signal indicating the timing difference in the receiving modem and the remote modem. The value in the error signal is added to a value in an offset integrator which integrates all of the error signals produced in a given transmission. The data is then relayed to a modulo subtractor which subtracts a predetermined value from the data if the value of the data is greater than the predetermined value. The data is then introduced to the offset integrator for integration and to a waveform generator. The waveform generator uses the data to offset a supply waveform an appropriate amount to match the frequency of the remote modem. As a result, the waveform generator produces a waveform that synchronously and smoothly tracks the clock waveform generated by the remote modem.
REFERENCES:
patent: 4866647 (1989-09-01), Farrow
patent: 5051981 (1991-09-01), Kline
patent: 5513209 (1996-04-01), Holm
patent: 5546032 (1996-08-01), Yatagai
patent: 5754607 (1998-05-01), Powell et al.
Betts William Lewis
Souders Keith Alan
Chin Stephen
Deppe Betsy L.
Paradyne Corporation
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