Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
SYSTEM AND METHOD FOR BUILT IN SELF TEST FOR TIMING MODULE HOLDOVER
Document Type and Number:
Japanese Patent JP2011024207
Kind Code:
A
Abstract:

To provide a method for use in a device having a local oscillator.

The method includes a step of training at least two mathematical models of an oscillator so as to find a prediction correction signal for each mathematical model on the basis of at least its part in a correction signal as a function of an external reference signal and as a function used to control a drift in the oscillator while a local oscillator controlled by the external reference signal is locked by the external reference signal. In the method, when the external reference signal cannot be used and when another correction signal is used to control the drift in the oscillator, a mathematical model of at least two mathematical models that results in a smallest time error is selected. The method further includes a step of testing the selected mathematical model using the sampled version of the correction signal in such a manner that the selected mathematical model can be used without necessity of testing duration that is in addition to a period of time used for the training.


Inventors:
NICHOLLS CHARLES
WU PHILIPPE
Application Number:
JP2010154195A
Publication Date:
February 03, 2011
Filing Date:
July 06, 2010
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
NORTEL NETWORKS LTD
International Classes:
H03L7/10; H03L1/02; H03L7/095
Domestic Patent References:
JPH11271476A1999-10-08
JP2006121171A2006-05-11
JP2004516740A2004-06-03
JPH11271476A1999-10-08
JP2006121171A2006-05-11
JP2004516740A2004-06-03
Foreign References:
US7424069B12008-09-09
Attorney, Agent or Firm:
Tadahiko Ito
Shinsuke Onuki
Tadashige Ito



 
Previous Patent: LOCK MECHANISM, AND PORTABLE ELECTRONIC DEVICE USING THE SAME

Next Patent: NO POP SWITCH