Patents Assigned to Matsushita Electric Industrial Co., Lrd
  • DSL modem apparatus and communication control method
    Publication number: 20050041729
    Abstract: A DSL modem apparatus provided at a transmission side in an upstream performs upstream communication using carrier indexes of the same range as a downstream. During an echo canceller learning period, a transmission signal is outputted to a line, via notch filters that cut the signal at a frequency location of a PILOT signal of the downstream. An echo signal is received via notch filters and a coefficient is set by calculating from the training signal of its own apparatus and the echo signal.
    Type: Application
    Filed: February 20, 2004
    Publication date: February 24, 2005
    Applicant: Matsushita Electric Industrial Co., Lrd
    Inventors: Nobuhiko Noma, Genzo Takagi, Motoyoshi Nagai, Mitsuhiro Araki, Akira Atsuta