发明名称 |
DSL modem apparatus and communication control method |
摘要 |
<p>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. <IMAGE></p> |
申请公布号 |
EP1508976(A1) |
申请公布日期 |
2005.02.23 |
申请号 |
EP20040012340 |
申请日期 |
2004.05.25 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
NOMA, NOBUHIKO;TAKAGI, GENZO;NAGAI, MOTOYOSHI;ARAKI, MITSUHIRO;ATSUTA, AKIRA |
分类号 |
H04B3/23;H04L5/02;H04L5/14;H04M11/06;(IPC1-7):H04B3/23 |
主分类号 |
H04B3/23 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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