Patent ID: 6965617
Filing Date: 2005-11-15
Classification: H04L,H04M

Abstract:
1. A resynchronization control apparatus for a subscriber communication machine which communicates with an office communication machine over an existing communication line comprising: an off-synchronous detector for detecting off-synchronization of communication with said office communication machine; a correlation processor for, when said off-synchronization is detected, correlatively processing received data received over said existing communication line and held data having been transmitted from said office communication machine in a steady state; and a resynchronization controller for specifying a synchronous timing based on said correlative processing of said correlation processor to establish resynchronization in communication with said office communication machine; wherein said correlation processor comprises: a signal holder for holding said held data received from said office communication machine in steady communication; a correlation operator for operating correlation between said held data held in said signal holder and received data received after detection of said off-synchronization to detect received data having high correlation with said held data received in a steady state; a signal data maximum value holder for holding a maximum value of absolute values of said held data or a value obtained by adding an arbitrary margin value to said maximum value; and a maximum value determination correlation operation controller for making said correlation operator carry out said correlation operation in only a time section in which absolute values of received data received after said off-synchronization is detected are not larger than a value held in said signal data maximum value holder.