Method and control system for the synchronized transmission of d

Details Method and control system for the synchronized transmission of d Method and control system for the synchronized transmission of d

1997-06-16

1999-10-19

Zimmerman, Brian

Communications: electrical

Continuously variable indicating

With meter reading

34082514, 34082544, 375362, 375364, 375371, 375373, 375376, 370503, 370509, 370514, 370516, 370520, H04L 700

Patent

active

059696311

ABSTRACT:
In a method and system for transmitting digital data, a data acceptance clock signal generator that has a controllable clock frequency in a peripheral module is correspondingly adapted to clock frequency information derived from a synchronization pulse train transmitted by a central unit. The same oscillator is used as a frequency source for determining the clock frequency information and for generating the data acceptance clock pulse. In this manner, simple RC oscillators are adequate to fulfill any requirements of long time accuracy of the oscillator. The clock frequency can be changed in that the central unit simply transmits altered clock frequency information. It is also possible to carry out an adjustment or adaptation in the case of deviations of the oscillator frequency in the peripheral unit. Preferably, the clock frequency information is derived from the reciprocal value of the time duration of at least one synchronization pulse, which is determined in a quantized manner by a first counter in a clock frequency information acquisition circuit which counts the number of oscillator pulses occurring during the synchronization pulse. The resulting count value is provided to a data acceptance clock signal generator, which is clocked by the same oscillator and counts the number of oscillator pulses until reaching a prescribed threshold value, whereupon it outputs a corresponding clock signal. By properly adapting numerical elements, it is also possible to process pulse width modulated signals using the present method and apparatus.

REFERENCES:
patent: 4229825 (1980-10-01), Guidoux
patent: 4411007 (1983-10-01), Rodman et al.
patent: 4988989 (1991-01-01), Goto
patent: 5594763 (1997-01-01), Nimishakavi
patent: 5612681 (1997-03-01), Funahashi et al.
patent: 5787132 (1998-07-01), Kishigami et al.

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