发明名称 Monituloinen langaton puhelin kaiunpoistoineen
摘要 A method and apparatus for canceling both earseal and hybrid echo in a Wireless Local Loop telephone system is disclosed. The present invention operates within a subscriber station having a plurality of telephone inputs, one of which is a dedicated handset and at least one other input being a standard analog telephone. During a conference call between a far end speaker and two near end speakers, the far end speaker may hear an echo of his own voice due to an earseal echo generated by the dedicated handset and a hybrid echo generated by a 4-to-2 wire hybrid interface within the subscriber station. In accordance with the present invention, two distinct echo cancellers are used in the subscriber station to reduce the two types of echo. A first echo canceller is optimized to remove the earseal echo generated at the dedicated handset while a second echo canceller is optimized to remove the hybrid echo generated at the 4-to-2 wire hybrid. The two echo cancellers operate independently such that neither echo canceller need adapt its filter coefficients when a change in the echo channel characteristics occur, such as when a speaker hangs up or another speaker joins the conversation.
申请公布号 FI19991937(A) 申请公布日期 1999.11.19
申请号 FI19990001937 申请日期 1999.09.10
申请人 QUALCOMM INCORPORATED,, 发明人 SIH,C.,GILBERT;GUPTA,KUMAR,SAMIR
分类号 H04M1/58;H04B3/23;H04M1/723;H04M9/08;H04W88/06 主分类号 H04M1/58
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