Time synchronization apparatus based on parallel processing
AssigneeElectronics and Telecommunications Research Instittute
InventorsSeung-woo Lee, Jung-hee Lee, Bhum-cheol Lee
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Abstract
A parallel processing-based time synchronization apparatus employs a double-filter structure based on parallel processing, providing more precise and reliable time synchronization between a master device and a slave device. A first filter is implemented as hardware so as to realize time synchronization despite cyclic synchronization message transmission at short intervals and the second filter is implemented as software so as to realize precise time synchronization.
Claims14
A parallel processing-based time synchronization apparatus comprising:
- a time phase detecting unit to compute and output a difference between local time information of a slave device and time information of a master device;
- a parallel filter unit including a first filter and a second filter, each of which low-pass filters a signal output from the time phase detecting unit and outputs the resultant signal;
- a summation unit to combine a signal output from the first filter and a signal output from the second filter and output the combined signal;
- and
- a time synchronization unit to output local time information by adjusting time information and frequency information of the slave device according to the signal output from the summation unit, wherein the first filter of the parallel filter unit is implemented as hardware so as to realize time synchronization despite cyclic synchronization message transmission at short intervals and the second filter of the parallel filter unit is implemented as software so as to realize precise time synchronization.
A parallel processing-based time synchronization apparatus comprising:
- a time phase detecting unit to compute and output a difference between local time information of a slave device and time information of a master device;
- a parallel filter unit including a first filter and a second filter, each of which low-pass filters a signal output from the time phase detecting unit and outputs the resulting signal;
- a summation unit to combine the signal output from the first filter and the signal output from the second filter and output the combined signal;
- an upsampling unit to upsample the signal output from the summation unit at intervals of a predetermined reference period which is shorter than intervals at which the time information of the master device is input and to output the resultant signal;
- and
- a time synchronization unit to output the local time information of the slave device by adjusting time information and frequency information of the slave device according to the signal output from the upsampling unit, wherein the first filter of the parallel filter unit is implemented as hardware so as to realize time synchronization despite cyclic synchronization message transmission at short intervals and the second filter of the parallel filter unit is implemented as software so as to realize precise time synchronization.
A parallel processing-based time synchronization apparatus comprising:
- a parallel filter unit including a first filter and a second filter, each of which low-pass filters a respective input signal and outputs respective resultant signals;
- a summation unit to combine the respective resultant signals and outputs the combined signal;
- and
- a time synchronization unit to output local time information by adjusting time information and frequency information of a slave device according to the combined signal, wherein the first filter of the parallel filter unit is implemented as hardware and the second filter of the parallel filter unit is implemented as software.
Dependencies are inferred from the claim text.