Patent ID: 6249558
Filing Date: 2001-06-19
Classification: H04L

Abstract:
A method for transmitting from a transmitter to a receiver digital data impulses having two logic levels ""0"" and ""1"", said receiver including a data acquisition signal generator having a controllable data acquisition frequency, said method comprising the following steps:(a) Manchester encoding said data impulses so that each data impulse has a not inverted impulse half and an inverted impulse half with an impulse flank change between the two data impulse halves,(b) providing and Manchester encoding synchronization impulses so that each synchronization impulse has a not inverted impulse half and an inverted impulse half with an impulse flank change between the two synchronization impulse halves,(c) sending, prior to any data impulse transmission, at least one Manchester encoded synchronization impulse for synchronizing said data acquisition signal generator with respect to time and with respect to a sync frequency provided by said at least one synchronization impulse, which remains current for at least one data impulse next to be transmitted,(d) defining by each impulse flank change a synchronization time point, whereby a time duration determined by two sequential synchronization time points represents a current impulse frequency,(e) generating a stepping frequency to provide counter stepping pulses SP, so that said stepping frequency is larger than said current impulse frequency,(f) performing said synchronizing of said data acquisition signal generator by stepping a counter with said stepping pulses during said time duration to provide a count of stepping pulses,(g) deriving from said count of stepping pulses a current accepted sync frequency (T.sub.akt),(h) deriving from said current accepted sync frequency a current data acquisition frequency for controlling said data acquisition signal generator,(i) scanning said logic levels of said data impulses in response to said current data acquisition frequency and said synchronization time points, and(j) performing a follow-up or intermediate synchronization of said data acquisition signal generator in response to deviations of said stepping frequency and/or of said synchronization time points and/or of following impulse durations of following data impulses.