Patent ID: 6975677

Claim:
A digital communication device for correcting transmission path characteristics containing noise transmitted from a plurality of half-duplex communication devices via a half-duplex transmission path, said device comprising: a near-end cross talk (NEXT) noise coefficient table, in which are stored equalizing coefficients of equalizers for correcting characteristics of a transmission path containing a NEXT noise transmitted from a near-end half-duplex communication device that is on side near to the digital communication device among said plurality of half-duplex communication devices; a far-end cross talk (FEXT) noise coefficient table, in which are stored equalizing coefficients of equalizers to correct characteristics of a transmission path containing a FEXT noise transmitted from a far-end half-duplex communication device that is on side far from the digital communication device among said plurality of half-duplex communication devices; and equalizers for correcting transmission path characteristics based on the equalizing coefficients in the NEXT noise coefficient table when the NEXT [FEXT] noise has been transmitted from said near-end half-duplex communication device, and on the other hand, for correcting transmission path characteristics based on the equalizing coefficients in the FEXT noise coefficient table when the FEXT noise has been transmitted from said far-end half-duplex communication device.